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gecko-dev/dom/canvas/CanvasRenderingContext2D.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CanvasRenderingContext2D.h"
#include "mozilla/gfx/Helpers.h"
#include "nsXULElement.h"
#include "nsIServiceManager.h"
#include "nsMathUtils.h"
#include "SVGImageContext.h"
#include "nsContentUtils.h"
#include "nsIDocument.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsSVGEffects.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIFrame.h"
#include "nsError.h"
#include "nsCSSParser.h"
#include "mozilla/css/StyleRule.h"
#include "mozilla/css/Declaration.h"
#include "nsComputedDOMStyle.h"
#include "nsStyleSet.h"
#include "nsPrintfCString.h"
#include "nsReadableUtils.h"
#include "nsColor.h"
#include "nsGfxCIID.h"
#include "nsIDocShell.h"
#include "nsIDOMWindow.h"
#include "nsPIDOMWindow.h"
#include "nsDisplayList.h"
#include "nsFocusManager.h"
#include "nsTArray.h"
#include "ImageEncoder.h"
#include "ImageRegion.h"
#include "gfxContext.h"
#include "gfxASurface.h"
#include "gfxImageSurface.h"
#include "gfxPlatform.h"
#include "gfxFont.h"
#include "gfxBlur.h"
#include "gfxUtils.h"
#include "nsFrameLoader.h"
#include "nsBidi.h"
#include "nsBidiPresUtils.h"
#include "Layers.h"
#include "CanvasUtils.h"
#include "nsIMemoryReporter.h"
#include "nsStyleUtil.h"
#include "CanvasImageCache.h"
#include <algorithm>
#include "jsapi.h"
#include "jsfriendapi.h"
#include "mozilla/Alignment.h"
#include "mozilla/Assertions.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ImageData.h"
#include "mozilla/dom/PBrowserParent.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/Endian.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Helpers.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/gfx/PatternHelpers.h"
#include "mozilla/ipc/DocumentRendererParent.h"
#include "mozilla/ipc/PDocumentRendererParent.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/unused.h"
#include "nsCCUncollectableMarker.h"
#include "nsWrapperCacheInlines.h"
#include "mozilla/dom/CanvasRenderingContext2DBinding.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/SVGMatrix.h"
#include "mozilla/dom/TextMetrics.h"
#include "mozilla/dom/UnionTypes.h"
#include "mozilla/dom/SVGMatrix.h"
#include "mozilla/FloatingPoint.h"
#include "nsGlobalWindow.h"
#include "GLContext.h"
#include "GLContextProvider.h"
#include "SVGContentUtils.h"
#include "SVGImageContext.h"
#include "nsIScreenManager.h"
#include "nsFilterInstance.h"
#include "nsSVGLength2.h"
#include "nsDeviceContext.h"
#include "nsFontMetrics.h"
#undef free // apparently defined by some windows header, clashing with a free()
// method in SkTypes.h
#ifdef USE_SKIA
#include "SkiaGLGlue.h"
#include "SurfaceStream.h"
#include "SurfaceTypes.h"
#endif
using mozilla::gl::GLContext;
using mozilla::gl::SkiaGLGlue;
using mozilla::gl::GLContextProvider;
#ifdef XP_WIN
#include "gfxWindowsPlatform.h"
#endif
#ifdef MOZ_WIDGET_GONK
#include "mozilla/layers/ShadowLayers.h"
#endif
// windows.h (included by chromium code) defines this, in its infinite wisdom
#undef DrawText
using namespace mozilla;
using namespace mozilla::CanvasUtils;
using namespace mozilla::css;
using namespace mozilla::gfx;
using namespace mozilla::image;
using namespace mozilla::ipc;
using namespace mozilla::layers;
namespace mgfx = mozilla::gfx;
namespace mozilla {
namespace dom {
// Cap sigma to avoid overly large temp surfaces.
const Float SIGMA_MAX = 100;
/* Memory reporter stuff */
static int64_t gCanvasAzureMemoryUsed = 0;
// This is KIND_OTHER because it's not always clear where in memory the pixels
// of a canvas are stored. Furthermore, this memory will be tracked by the
// underlying surface implementations. See bug 655638 for details.
class Canvas2dPixelsReporter MOZ_FINAL : public nsIMemoryReporter
{
~Canvas2dPixelsReporter() {}
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
return MOZ_COLLECT_REPORT(
"canvas-2d-pixels", KIND_OTHER, UNITS_BYTES,
gCanvasAzureMemoryUsed,
"Memory used by 2D canvases. Each canvas requires "
"(width * height * 4) bytes.");
}
};
NS_IMPL_ISUPPORTS(Canvas2dPixelsReporter, nsIMemoryReporter)
class CanvasRadialGradient : public CanvasGradient
{
public:
CanvasRadialGradient(CanvasRenderingContext2D* aContext,
const Point &aBeginOrigin, Float aBeginRadius,
const Point &aEndOrigin, Float aEndRadius)
: CanvasGradient(aContext, Type::RADIAL)
, mCenter1(aBeginOrigin)
, mCenter2(aEndOrigin)
, mRadius1(aBeginRadius)
, mRadius2(aEndRadius)
{
}
Point mCenter1;
Point mCenter2;
Float mRadius1;
Float mRadius2;
};
class CanvasLinearGradient : public CanvasGradient
{
public:
CanvasLinearGradient(CanvasRenderingContext2D* aContext,
const Point &aBegin, const Point &aEnd)
: CanvasGradient(aContext, Type::LINEAR)
, mBegin(aBegin)
, mEnd(aEnd)
{
}
protected:
friend class CanvasGeneralPattern;
// Beginning of linear gradient.
Point mBegin;
// End of linear gradient.
Point mEnd;
};
// This class is named 'GeneralCanvasPattern' instead of just
// 'GeneralPattern' to keep Windows PGO builds from confusing the
// GeneralPattern class in gfxContext.cpp with this one.
class CanvasGeneralPattern
{
public:
typedef CanvasRenderingContext2D::Style Style;
typedef CanvasRenderingContext2D::ContextState ContextState;
Pattern& ForStyle(CanvasRenderingContext2D *aCtx,
Style aStyle,
DrawTarget *aRT)
{
// This should only be called once or the mPattern destructor will
// not be executed.
NS_ASSERTION(!mPattern.GetPattern(), "ForStyle() should only be called once on CanvasGeneralPattern!");
const ContextState &state = aCtx->CurrentState();
if (state.StyleIsColor(aStyle)) {
mPattern.InitColorPattern(Color::FromABGR(state.colorStyles[aStyle]));
} else if (state.gradientStyles[aStyle] &&
state.gradientStyles[aStyle]->GetType() == CanvasGradient::Type::LINEAR) {
CanvasLinearGradient *gradient =
static_cast<CanvasLinearGradient*>(state.gradientStyles[aStyle].get());
mPattern.InitLinearGradientPattern(gradient->mBegin, gradient->mEnd,
gradient->GetGradientStopsForTarget(aRT));
} else if (state.gradientStyles[aStyle] &&
state.gradientStyles[aStyle]->GetType() == CanvasGradient::Type::RADIAL) {
CanvasRadialGradient *gradient =
static_cast<CanvasRadialGradient*>(state.gradientStyles[aStyle].get());
mPattern.InitRadialGradientPattern(gradient->mCenter1, gradient->mCenter2,
gradient->mRadius1, gradient->mRadius2,
gradient->GetGradientStopsForTarget(aRT));
} else if (state.patternStyles[aStyle]) {
if (aCtx->mCanvasElement) {
CanvasUtils::DoDrawImageSecurityCheck(aCtx->mCanvasElement,
state.patternStyles[aStyle]->mPrincipal,
state.patternStyles[aStyle]->mForceWriteOnly,
state.patternStyles[aStyle]->mCORSUsed);
}
ExtendMode mode;
if (state.patternStyles[aStyle]->mRepeat == CanvasPattern::RepeatMode::NOREPEAT) {
mode = ExtendMode::CLAMP;
} else {
mode = ExtendMode::REPEAT;
}
mPattern.InitSurfacePattern(state.patternStyles[aStyle]->mSurface, mode,
state.patternStyles[aStyle]->mTransform);
}
return *mPattern.GetPattern();
}
GeneralPattern mPattern;
};
/* This is an RAII based class that can be used as a drawtarget for
* operations that need to have a filter applied to their results.
* All coordinates passed to the constructor are in device space.
*/
class AdjustedTargetForFilter
{
public:
typedef CanvasRenderingContext2D::ContextState ContextState;
AdjustedTargetForFilter(CanvasRenderingContext2D *ctx,
DrawTarget *aFinalTarget,
const mgfx::IntPoint& aFilterSpaceToTargetOffset,
const mgfx::IntRect& aPreFilterBounds,
const mgfx::IntRect& aPostFilterBounds,
mgfx::CompositionOp aCompositionOp)
: mCtx(nullptr)
, mCompositionOp(aCompositionOp)
{
mCtx = ctx;
mFinalTarget = aFinalTarget;
mPostFilterBounds = aPostFilterBounds;
mOffset = aFilterSpaceToTargetOffset;
nsIntRegion sourceGraphicNeededRegion;
nsIntRegion fillPaintNeededRegion;
nsIntRegion strokePaintNeededRegion;
FilterSupport::ComputeSourceNeededRegions(
ctx->CurrentState().filter, mgfx::ThebesIntRect(mPostFilterBounds),
sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
mSourceGraphicRect = mgfx::ToIntRect(sourceGraphicNeededRegion.GetBounds());
mFillPaintRect = mgfx::ToIntRect(fillPaintNeededRegion.GetBounds());
mStrokePaintRect = mgfx::ToIntRect(strokePaintNeededRegion.GetBounds());
mSourceGraphicRect = mSourceGraphicRect.Intersect(aPreFilterBounds);
if (mSourceGraphicRect.IsEmpty()) {
// The filter might not make any use of the source graphic. We need to
// create a DrawTarget that we can return from DT() anyway, so we'll
// just use a 1x1-sized one.
mSourceGraphicRect.SizeTo(1, 1);
}
mTarget =
mFinalTarget->CreateSimilarDrawTarget(mSourceGraphicRect.Size(), SurfaceFormat::B8G8R8A8);
if (!mTarget) {
// XXX - Deal with the situation where our temp size is too big to
// fit in a texture (bug 1066622).
mTarget = mFinalTarget;
mCtx = nullptr;
mFinalTarget = nullptr;
return;
}
mTarget->SetTransform(
mFinalTarget->GetTransform().PostTranslate(-mSourceGraphicRect.TopLeft() + mOffset));
}
// Return a SourceSurface that contains the FillPaint or StrokePaint source.
TemporaryRef<SourceSurface>
DoSourcePaint(mgfx::IntRect& aRect, CanvasRenderingContext2D::Style aStyle)
{
if (aRect.IsEmpty()) {
return nullptr;
}
RefPtr<DrawTarget> dt =
mFinalTarget->CreateSimilarDrawTarget(aRect.Size(), SurfaceFormat::B8G8R8A8);
if (!dt) {
aRect.SetEmpty();
return nullptr;
}
Matrix transform =
mFinalTarget->GetTransform().PostTranslate(-aRect.TopLeft() + mOffset);
dt->SetTransform(transform);
if (transform.Invert()) {
mgfx::Rect dtBounds(0, 0, aRect.width, aRect.height);
mgfx::Rect fillRect = transform.TransformBounds(dtBounds);
dt->FillRect(fillRect, CanvasGeneralPattern().ForStyle(mCtx, aStyle, dt));
}
return dt->Snapshot();
}
~AdjustedTargetForFilter()
{
if (!mCtx) {
return;
}
RefPtr<SourceSurface> snapshot = mTarget->Snapshot();
RefPtr<SourceSurface> fillPaint =
DoSourcePaint(mFillPaintRect, CanvasRenderingContext2D::Style::FILL);
RefPtr<SourceSurface> strokePaint =
DoSourcePaint(mStrokePaintRect, CanvasRenderingContext2D::Style::STROKE);
AutoRestoreTransform autoRestoreTransform(mFinalTarget);
mFinalTarget->SetTransform(Matrix());
mgfx::FilterSupport::RenderFilterDescription(
mFinalTarget, mCtx->CurrentState().filter,
mgfx::Rect(mPostFilterBounds),
snapshot, mSourceGraphicRect,
fillPaint, mFillPaintRect,
strokePaint, mStrokePaintRect,
mCtx->CurrentState().filterAdditionalImages,
mPostFilterBounds.TopLeft() - mOffset,
DrawOptions(1.0f, mCompositionOp));
}
DrawTarget* DT()
{
return mTarget;
}
private:
RefPtr<DrawTarget> mTarget;
RefPtr<DrawTarget> mFinalTarget;
CanvasRenderingContext2D *mCtx;
mgfx::IntRect mSourceGraphicRect;
mgfx::IntRect mFillPaintRect;
mgfx::IntRect mStrokePaintRect;
mgfx::IntRect mPostFilterBounds;
mgfx::IntPoint mOffset;
mgfx::CompositionOp mCompositionOp;
};
/* This is an RAII based class that can be used as a drawtarget for
* operations that need to have a shadow applied to their results.
* All coordinates passed to the constructor are in device space.
*/
class AdjustedTargetForShadow
{
public:
typedef CanvasRenderingContext2D::ContextState ContextState;
AdjustedTargetForShadow(CanvasRenderingContext2D *ctx,
DrawTarget *aFinalTarget,
const mgfx::Rect& aBounds,
mgfx::CompositionOp aCompositionOp)
: mCtx(nullptr)
, mCompositionOp(aCompositionOp)
{
mCtx = ctx;
mFinalTarget = aFinalTarget;
const ContextState &state = mCtx->CurrentState();
mSigma = state.ShadowBlurSigma();
mgfx::Rect bounds = aBounds;
int32_t blurRadius = state.ShadowBlurRadius();
// We actually include the bounds of the shadow blur, this makes it
// easier to execute the actual blur on hardware, and shouldn't affect
// the amount of pixels that need to be touched.
bounds.Inflate(blurRadius);
bounds.RoundOut();
bounds.ToIntRect(&mTempRect);
mTarget =
mFinalTarget->CreateShadowDrawTarget(mTempRect.Size(),
SurfaceFormat::B8G8R8A8, mSigma);
if (!mTarget) {
// XXX - Deal with the situation where our temp size is too big to
// fit in a texture (bug 1066622).
mTarget = mFinalTarget;
mCtx = nullptr;
mFinalTarget = nullptr;
} else {
mTarget->SetTransform(
mFinalTarget->GetTransform().PostTranslate(-mTempRect.TopLeft()));
}
}
~AdjustedTargetForShadow()
{
if (!mCtx) {
return;
}
RefPtr<SourceSurface> snapshot = mTarget->Snapshot();
mFinalTarget->DrawSurfaceWithShadow(snapshot, mTempRect.TopLeft(),
Color::FromABGR(mCtx->CurrentState().shadowColor),
mCtx->CurrentState().shadowOffset, mSigma,
mCompositionOp);
}
DrawTarget* DT()
{
return mTarget;
}
mgfx::IntPoint OffsetToFinalDT()
{
return mTempRect.TopLeft();
}
private:
RefPtr<DrawTarget> mTarget;
RefPtr<DrawTarget> mFinalTarget;
CanvasRenderingContext2D *mCtx;
Float mSigma;
mgfx::IntRect mTempRect;
mgfx::CompositionOp mCompositionOp;
};
/* This is an RAII based class that can be used as a drawtarget for
* operations that need a shadow or a filter drawn. It will automatically
* provide a temporary target when needed, and if so blend it back with a
* shadow, filter, or both.
* If both a shadow and a filter are needed, the filter is applied first,
* and the shadow is applied to the filtered results.
*
* aBounds specifies the bounds of the drawing operation that will be
* drawn to the target, it is given in device space! If this is nullptr the
* drawing operation will be assumed to cover the whole canvas.
*/
class AdjustedTarget
{
public:
typedef CanvasRenderingContext2D::ContextState ContextState;
explicit AdjustedTarget(CanvasRenderingContext2D* ctx,
const mgfx::Rect *aBounds = nullptr)
{
mTarget = ctx->mTarget;
// All rects in this function are in the device space of ctx->mTarget.
// In order to keep our temporary surfaces as small as possible, we first
// calculate what their maximum required bounds would need to be if we
// were to fill the whole canvas. Everything outside those bounds we don't
// need to render.
mgfx::Rect r(0, 0, ctx->mWidth, ctx->mHeight);
mgfx::Rect maxSourceNeededBoundsForShadow =
MaxSourceNeededBoundsForShadow(r, ctx);
mgfx::Rect maxSourceNeededBoundsForFilter =
MaxSourceNeededBoundsForFilter(maxSourceNeededBoundsForShadow, ctx);
mgfx::Rect bounds = maxSourceNeededBoundsForFilter;
if (aBounds) {
bounds = bounds.Intersect(*aBounds);
}
mgfx::Rect boundsAfterFilter = BoundsAfterFilter(bounds, ctx);
mozilla::gfx::CompositionOp op = ctx->CurrentState().op;
mgfx::IntPoint offsetToFinalDT;
// First set up the shadow draw target, because the shadow goes outside.
// It applies to the post-filter results, if both a filter and a shadow
// are used.
if (ctx->NeedToDrawShadow()) {
mShadowTarget = MakeUnique<AdjustedTargetForShadow>(
ctx, mTarget, boundsAfterFilter, op);
mTarget = mShadowTarget->DT();
offsetToFinalDT = mShadowTarget->OffsetToFinalDT();
// If we also have a filter, the filter needs to be drawn with OP_OVER
// because shadow drawing already applies op on the result.
op = mgfx::CompositionOp::OP_OVER;
}
// Now set up the filter draw target.
if (ctx->NeedToApplyFilter()) {
bounds.RoundOut();
mgfx::IntRect intBounds;
if (!bounds.ToIntRect(&intBounds)) {
return;
}
mFilterTarget = MakeUnique<AdjustedTargetForFilter>(
ctx, mTarget, offsetToFinalDT, intBounds,
mgfx::RoundedToInt(boundsAfterFilter), op);
mTarget = mFilterTarget->DT();
}
}
~AdjustedTarget()
{
// The order in which the targets are finalized is important.
// Filters are inside, any shadow applies to the post-filter results.
mFilterTarget.reset();
mShadowTarget.reset();
}
operator DrawTarget*()
{
return mTarget;
}
DrawTarget* operator->()
{
return mTarget;
}
private:
mgfx::Rect
MaxSourceNeededBoundsForFilter(const mgfx::Rect& aDestBounds, CanvasRenderingContext2D *ctx)
{
if (!ctx->NeedToApplyFilter()) {
return aDestBounds;
}
nsIntRegion sourceGraphicNeededRegion;
nsIntRegion fillPaintNeededRegion;
nsIntRegion strokePaintNeededRegion;
FilterSupport::ComputeSourceNeededRegions(
ctx->CurrentState().filter, mgfx::ThebesIntRect(mgfx::RoundedToInt(aDestBounds)),
sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
return mgfx::Rect(mgfx::ToIntRect(sourceGraphicNeededRegion.GetBounds()));
}
mgfx::Rect
MaxSourceNeededBoundsForShadow(const mgfx::Rect& aDestBounds, CanvasRenderingContext2D *ctx)
{
if (!ctx->NeedToDrawShadow()) {
return aDestBounds;
}
const ContextState &state = ctx->CurrentState();
mgfx::Rect sourceBounds = aDestBounds - state.shadowOffset;
sourceBounds.Inflate(state.ShadowBlurRadius());
// Union the shadow source with the original rect because we're going to
// draw both.
return sourceBounds.Union(aDestBounds);
}
mgfx::Rect
BoundsAfterFilter(const mgfx::Rect& aBounds, CanvasRenderingContext2D *ctx)
{
if (!ctx->NeedToApplyFilter()) {
return aBounds;
}
mgfx::Rect bounds(aBounds);
bounds.RoundOut();
mgfx::IntRect intBounds;
if (!bounds.ToIntRect(&intBounds)) {
return mgfx::Rect();
}
nsIntRegion extents =
mgfx::FilterSupport::ComputePostFilterExtents(ctx->CurrentState().filter,
mgfx::ThebesIntRect(intBounds));
return mgfx::Rect(mgfx::ToIntRect(extents.GetBounds()));
}
RefPtr<DrawTarget> mTarget;
UniquePtr<AdjustedTargetForShadow> mShadowTarget;
UniquePtr<AdjustedTargetForFilter> mFilterTarget;
};
void
CanvasPattern::SetTransform(SVGMatrix& aMatrix)
{
mTransform = ToMatrix(aMatrix.GetMatrix());
}
void
CanvasGradient::AddColorStop(float offset, const nsAString& colorstr, ErrorResult& rv)
{
if (offset < 0.0 || offset > 1.0) {
rv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
nsCSSValue value;
nsCSSParser parser;
if (!parser.ParseColorString(colorstr, nullptr, 0, value)) {
rv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
nscolor color;
if (!nsRuleNode::ComputeColor(value, nullptr, nullptr, color)) {
rv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
mStops = nullptr;
GradientStop newStop;
newStop.offset = offset;
newStop.color = Color::FromABGR(color);
mRawStops.AppendElement(newStop);
}
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CanvasGradient, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CanvasGradient, Release)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CanvasGradient, mContext)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CanvasPattern, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CanvasPattern, Release)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CanvasPattern, mContext)
class CanvasRenderingContext2DUserData : public LayerUserData {
public:
explicit CanvasRenderingContext2DUserData(CanvasRenderingContext2D *aContext)
: mContext(aContext)
{
aContext->mUserDatas.AppendElement(this);
}
~CanvasRenderingContext2DUserData()
{
if (mContext) {
mContext->mUserDatas.RemoveElement(this);
}
}
static void PreTransactionCallback(void* aData)
{
CanvasRenderingContext2DUserData* self =
static_cast<CanvasRenderingContext2DUserData*>(aData);
CanvasRenderingContext2D* context = self->mContext;
if (!context || !context->mStream || !context->mTarget)
return;
// Since SkiaGL default to store drawing command until flush
// We will have to flush it before present.
context->mTarget->Flush();
}
static void DidTransactionCallback(void* aData)
{
CanvasRenderingContext2DUserData* self =
static_cast<CanvasRenderingContext2DUserData*>(aData);
if (self->mContext) {
self->mContext->MarkContextClean();
}
}
bool IsForContext(CanvasRenderingContext2D *aContext)
{
return mContext == aContext;
}
void Forget()
{
mContext = nullptr;
}
private:
CanvasRenderingContext2D *mContext;
};
NS_IMPL_CYCLE_COLLECTING_ADDREF(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTING_RELEASE(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_CLASS(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCanvasElement)
for (uint32_t i = 0; i < tmp->mStyleStack.Length(); i++) {
ImplCycleCollectionUnlink(tmp->mStyleStack[i].patternStyles[Style::STROKE]);
ImplCycleCollectionUnlink(tmp->mStyleStack[i].patternStyles[Style::FILL]);
ImplCycleCollectionUnlink(tmp->mStyleStack[i].gradientStyles[Style::STROKE]);
ImplCycleCollectionUnlink(tmp->mStyleStack[i].gradientStyles[Style::FILL]);
}
for (size_t x = 0 ; x < tmp->mHitRegionsOptions.Length(); x++) {
RegionInfo& info = tmp->mHitRegionsOptions[x];
if (info.mElement) {
ImplCycleCollectionUnlink(info.mElement);
}
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCanvasElement)
for (uint32_t i = 0; i < tmp->mStyleStack.Length(); i++) {
ImplCycleCollectionTraverse(cb, tmp->mStyleStack[i].patternStyles[Style::STROKE], "Stroke CanvasPattern");
ImplCycleCollectionTraverse(cb, tmp->mStyleStack[i].patternStyles[Style::FILL], "Fill CanvasPattern");
ImplCycleCollectionTraverse(cb, tmp->mStyleStack[i].gradientStyles[Style::STROKE], "Stroke CanvasGradient");
ImplCycleCollectionTraverse(cb, tmp->mStyleStack[i].gradientStyles[Style::FILL], "Fill CanvasGradient");
}
for (size_t x = 0 ; x < tmp->mHitRegionsOptions.Length(); x++) {
RegionInfo& info = tmp->mHitRegionsOptions[x];
if (info.mElement) {
ImplCycleCollectionTraverse(cb, info.mElement, "Hit region fallback element");
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(CanvasRenderingContext2D)
if (nsCCUncollectableMarker::sGeneration && tmp->IsBlack()) {
dom::Element* canvasElement = tmp->mCanvasElement;
if (canvasElement) {
if (canvasElement->IsPurple()) {
canvasElement->RemovePurple();
}
dom::Element::MarkNodeChildren(canvasElement);
}
return true;
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(CanvasRenderingContext2D)
return nsCCUncollectableMarker::sGeneration && tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(CanvasRenderingContext2D)
return nsCCUncollectableMarker::sGeneration && tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CanvasRenderingContext2D)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsICanvasRenderingContextInternal)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
/**
** CanvasRenderingContext2D impl
**/
// Initialize our static variables.
uint32_t CanvasRenderingContext2D::sNumLivingContexts = 0;
DrawTarget* CanvasRenderingContext2D::sErrorTarget = nullptr;
CanvasRenderingContext2D::CanvasRenderingContext2D()
: mRenderingMode(RenderingMode::OpenGLBackendMode)
// these are the default values from the Canvas spec
, mWidth(0), mHeight(0)
, mZero(false), mOpaque(false)
, mResetLayer(true)
, mIPC(false)
, mStream(nullptr)
, mIsEntireFrameInvalid(false)
, mPredictManyRedrawCalls(false), mPathTransformWillUpdate(false)
, mInvalidateCount(0)
{
sNumLivingContexts++;
// The default is to use OpenGL mode
if (!gfxPlatform::GetPlatform()->UseAcceleratedSkiaCanvas()) {
mRenderingMode = RenderingMode::SoftwareBackendMode;
}
}
CanvasRenderingContext2D::~CanvasRenderingContext2D()
{
RemovePostRefreshObserver();
Reset();
// Drop references from all CanvasRenderingContext2DUserData to this context
for (uint32_t i = 0; i < mUserDatas.Length(); ++i) {
mUserDatas[i]->Forget();
}
sNumLivingContexts--;
if (!sNumLivingContexts) {
NS_IF_RELEASE(sErrorTarget);
}
RemoveDemotableContext(this);
}
JSObject*
CanvasRenderingContext2D::WrapObject(JSContext *cx)
{
return CanvasRenderingContext2DBinding::Wrap(cx, this);
}
bool
CanvasRenderingContext2D::ParseColor(const nsAString& aString,
nscolor* aColor)
{
nsIDocument* document = mCanvasElement
? mCanvasElement->OwnerDoc()
: nullptr;
// Pass the CSS Loader object to the parser, to allow parser error
// reports to include the outer window ID.
nsCSSParser parser(document ? document->CSSLoader() : nullptr);
nsCSSValue value;
if (!parser.ParseColorString(aString, nullptr, 0, value)) {
return false;
}
if (value.IsNumericColorUnit()) {
// if we already have a color we can just use it directly
*aColor = value.GetColorValue();
} else {
// otherwise resolve it
nsIPresShell* presShell = GetPresShell();
nsRefPtr<nsStyleContext> parentContext;
if (mCanvasElement && mCanvasElement->IsInDoc()) {
// Inherit from the canvas element.
parentContext = nsComputedDOMStyle::GetStyleContextForElement(
mCanvasElement, nullptr, presShell);
}
unused << nsRuleNode::ComputeColor(
value, presShell ? presShell->GetPresContext() : nullptr, parentContext,
*aColor);
}
return true;
}
nsresult
CanvasRenderingContext2D::Reset()
{
if (mCanvasElement) {
mCanvasElement->InvalidateCanvas();
}
// only do this for non-docshell created contexts,
// since those are the ones that we created a surface for
if (mTarget && IsTargetValid() && !mDocShell) {
gCanvasAzureMemoryUsed -= mWidth * mHeight * 4;
}
mTarget = nullptr;
mStream = nullptr;
// reset hit regions
mHitRegionsOptions.ClearAndRetainStorage();
// Since the target changes the backing texture will change, and this will
// no longer be valid.
mIsEntireFrameInvalid = false;
mPredictManyRedrawCalls = false;
return NS_OK;
}
void
CanvasRenderingContext2D::SetStyleFromString(const nsAString& str,
Style whichStyle)
{
MOZ_ASSERT(!str.IsVoid());
nscolor color;
if (!ParseColor(str, &color)) {
return;
}
CurrentState().SetColorStyle(whichStyle, color);
}
void
CanvasRenderingContext2D::GetStyleAsUnion(OwningStringOrCanvasGradientOrCanvasPattern& aValue,
Style aWhichStyle)
{
const ContextState &state = CurrentState();
if (state.patternStyles[aWhichStyle]) {
aValue.SetAsCanvasPattern() = state.patternStyles[aWhichStyle];
} else if (state.gradientStyles[aWhichStyle]) {
aValue.SetAsCanvasGradient() = state.gradientStyles[aWhichStyle];
} else {
StyleColorToString(state.colorStyles[aWhichStyle], aValue.SetAsString());
}
}
// static
void
CanvasRenderingContext2D::StyleColorToString(const nscolor& aColor, nsAString& aStr)
{
// We can't reuse the normal CSS color stringification code,
// because the spec calls for a different algorithm for canvas.
if (NS_GET_A(aColor) == 255) {
CopyUTF8toUTF16(nsPrintfCString("#%02x%02x%02x",
NS_GET_R(aColor),
NS_GET_G(aColor),
NS_GET_B(aColor)),
aStr);
} else {
CopyUTF8toUTF16(nsPrintfCString("rgba(%d, %d, %d, ",
NS_GET_R(aColor),
NS_GET_G(aColor),
NS_GET_B(aColor)),
aStr);
aStr.AppendFloat(nsStyleUtil::ColorComponentToFloat(NS_GET_A(aColor)));
aStr.Append(')');
}
}
nsresult
CanvasRenderingContext2D::Redraw()
{
if (mIsEntireFrameInvalid) {
return NS_OK;
}
mIsEntireFrameInvalid = true;
if (!mCanvasElement) {
NS_ASSERTION(mDocShell, "Redraw with no canvas element or docshell!");
return NS_OK;
}
nsSVGEffects::InvalidateDirectRenderingObservers(mCanvasElement);
mCanvasElement->InvalidateCanvasContent(nullptr);
return NS_OK;
}
void
CanvasRenderingContext2D::Redraw(const mgfx::Rect &r)
{
++mInvalidateCount;
if (mIsEntireFrameInvalid) {
return;
}
if (mPredictManyRedrawCalls ||
mInvalidateCount > kCanvasMaxInvalidateCount) {
Redraw();
return;
}
if (!mCanvasElement) {
NS_ASSERTION(mDocShell, "Redraw with no canvas element or docshell!");
return;
}
nsSVGEffects::InvalidateDirectRenderingObservers(mCanvasElement);
mCanvasElement->InvalidateCanvasContent(&r);
}
void
CanvasRenderingContext2D::DidRefresh()
{
if (mStream && mStream->GLContext()) {
mStream->GLContext()->FlushIfHeavyGLCallsSinceLastFlush();
}
}
void
CanvasRenderingContext2D::RedrawUser(const gfxRect& r)
{
if (mIsEntireFrameInvalid) {
++mInvalidateCount;
return;
}
mgfx::Rect newr =
mTarget->GetTransform().TransformBounds(ToRect(r));
Redraw(newr);
}
bool CanvasRenderingContext2D::SwitchRenderingMode(RenderingMode aRenderingMode)
{
if (!IsTargetValid() || mRenderingMode == aRenderingMode) {
return false;
}
RefPtr<SourceSurface> snapshot = mTarget->Snapshot();
RefPtr<DrawTarget> oldTarget = mTarget;
mTarget = nullptr;
mStream = nullptr;
mResetLayer = true;
// Recreate target using the new rendering mode
RenderingMode attemptedMode = EnsureTarget(aRenderingMode);
if (!IsTargetValid())
return false;
// We succeeded, so update mRenderingMode to reflect reality
mRenderingMode = attemptedMode;
// Restore the content from the old DrawTarget
mgfx::Rect r(0, 0, mWidth, mHeight);
mTarget->DrawSurface(snapshot, r, r);
// Restore the clips and transform
for (uint32_t i = 0; i < CurrentState().clipsPushed.size(); i++) {
mTarget->PushClip(CurrentState().clipsPushed[i]);
}
mTarget->SetTransform(oldTarget->GetTransform());
return true;
}
void CanvasRenderingContext2D::Demote()
{
if (SwitchRenderingMode(RenderingMode::SoftwareBackendMode)) {
RemoveDemotableContext(this);
}
}
std::vector<CanvasRenderingContext2D*>&
CanvasRenderingContext2D::DemotableContexts()
{
static std::vector<CanvasRenderingContext2D*> contexts;
return contexts;
}
void
CanvasRenderingContext2D::DemoteOldestContextIfNecessary()
{
const size_t kMaxContexts = 64;
std::vector<CanvasRenderingContext2D*>& contexts = DemotableContexts();
if (contexts.size() < kMaxContexts)
return;
CanvasRenderingContext2D* oldest = contexts.front();
if (oldest->SwitchRenderingMode(RenderingMode::SoftwareBackendMode)) {
RemoveDemotableContext(oldest);
}
}
void
CanvasRenderingContext2D::AddDemotableContext(CanvasRenderingContext2D* context)
{
std::vector<CanvasRenderingContext2D*>::iterator iter = std::find(DemotableContexts().begin(), DemotableContexts().end(), context);
if (iter != DemotableContexts().end())
return;
DemotableContexts().push_back(context);
}
void
CanvasRenderingContext2D::RemoveDemotableContext(CanvasRenderingContext2D* context)
{
std::vector<CanvasRenderingContext2D*>::iterator iter = std::find(DemotableContexts().begin(), DemotableContexts().end(), context);
if (iter != DemotableContexts().end())
DemotableContexts().erase(iter);
}
bool
CanvasRenderingContext2D::CheckSizeForSkiaGL(IntSize size) {
MOZ_ASSERT(NS_IsMainThread());
int minsize = Preferences::GetInt("gfx.canvas.min-size-for-skia-gl", 128);
if (size.width < minsize || size.height < minsize) {
return false;
}
// Maximum pref allows 3 different options:
// 0 means unlimited size
// > 0 means use value as an absolute threshold
// < 0 means use the number of screen pixels as a threshold
int maxsize = Preferences::GetInt("gfx.canvas.max-size-for-skia-gl", 0);
// unlimited max size
if (!maxsize) {
return true;
}
// absolute max size threshold
if (maxsize > 0) {
return size.width <= maxsize && size.height <= maxsize;
}
// Cache the number of pixels on the primary screen
static int32_t gScreenPixels = -1;
if (gScreenPixels < 0) {
// Default to historical mobile screen size of 980x480, like FishIEtank.
// In addition, allow skia use up to this size even if the screen is smaller.
// A lot content expects this size to work well.
// See Bug 999841
if (gfxPlatform::GetPlatform()->HasEnoughTotalSystemMemoryForSkiaGL()) {
gScreenPixels = 980 * 480;
}
nsCOMPtr<nsIScreenManager> screenManager =
do_GetService("@mozilla.org/gfx/screenmanager;1");
if (screenManager) {
nsCOMPtr<nsIScreen> primaryScreen;
screenManager->GetPrimaryScreen(getter_AddRefs(primaryScreen));
if (primaryScreen) {
int32_t x, y, width, height;
primaryScreen->GetRect(&x, &y, &width, &height);
gScreenPixels = std::max(gScreenPixels, width * height);
}
}
}
// Just always use a scale of 1.0. It can be changed if a lot of contents need it.
static double gDefaultScale = 1.0;
double scale = gDefaultScale > 0 ? gDefaultScale : 1.0;
int32_t threshold = ceil(scale * scale * gScreenPixels);
// screen size acts as max threshold
return threshold < 0 || (size.width * size.height) <= threshold;
}
CanvasRenderingContext2D::RenderingMode
CanvasRenderingContext2D::EnsureTarget(RenderingMode aRenderingMode)
{
// This would make no sense, so make sure we don't get ourselves in a mess
MOZ_ASSERT(mRenderingMode != RenderingMode::DefaultBackendMode);
RenderingMode mode = (aRenderingMode == RenderingMode::DefaultBackendMode) ? mRenderingMode : aRenderingMode;
if (mTarget && mode == mRenderingMode) {
return mRenderingMode;
}
// Check that the dimensions are sane
IntSize size(mWidth, mHeight);
if (size.width <= 0xFFFF && size.height <= 0xFFFF &&
size.width >= 0 && size.height >= 0) {
SurfaceFormat format = GetSurfaceFormat();
nsIDocument* ownerDoc = nullptr;
if (mCanvasElement) {
ownerDoc = mCanvasElement->OwnerDoc();
}
nsRefPtr<LayerManager> layerManager = nullptr;
if (ownerDoc) {
layerManager =
nsContentUtils::PersistentLayerManagerForDocument(ownerDoc);
}
if (layerManager) {
if (mode == RenderingMode::OpenGLBackendMode && CheckSizeForSkiaGL(size)) {
DemoteOldestContextIfNecessary();
SkiaGLGlue* glue = gfxPlatform::GetPlatform()->GetSkiaGLGlue();
#if USE_SKIA
if (glue && glue->GetGrContext() && glue->GetGLContext()) {
mTarget = Factory::CreateDrawTargetSkiaWithGrContext(glue->GetGrContext(), size, format);
if (mTarget) {
mStream = gl::SurfaceStream::CreateForType(gl::SurfaceStreamType::TripleBuffer,
glue->GetGLContext());
AddDemotableContext(this);
} else {
printf_stderr("Failed to create a SkiaGL DrawTarget, falling back to software\n");
mode = RenderingMode::SoftwareBackendMode;
}
}
#endif
if (!mTarget) {
mTarget = layerManager->CreateDrawTarget(size, format);
}
} else {
mTarget = layerManager->CreateDrawTarget(size, format);
mode = RenderingMode::SoftwareBackendMode;
}
} else {
mTarget = gfxPlatform::GetPlatform()->CreateOffscreenCanvasDrawTarget(size, format);
mode = RenderingMode::SoftwareBackendMode;
}
}
if (mTarget) {
static bool registered = false;
if (!registered) {
registered = true;
RegisterStrongMemoryReporter(new Canvas2dPixelsReporter());
}
gCanvasAzureMemoryUsed += mWidth * mHeight * 4;
JSContext* context = nsContentUtils::GetCurrentJSContext();
if (context) {
JS_updateMallocCounter(context, mWidth * mHeight * 4);
}
mTarget->ClearRect(mgfx::Rect(Point(0, 0), Size(mWidth, mHeight)));
if (mTarget->GetBackendType() == mgfx::BackendType::CAIRO) {
// Cairo doesn't play well with huge clips. When given a very big clip it
// will try to allocate big mask surface without taking the target
// size into account which can cause OOM. See bug 1034593.
// This limits the clip extents to the size of the canvas.
// A fix in Cairo would probably be preferable, but requires somewhat
// invasive changes.
mTarget->PushClipRect(mgfx::Rect(Point(0, 0), Size(mWidth, mHeight)));
}
// Force a full layer transaction since we didn't have a layer before
// and now we might need one.
if (mCanvasElement) {
mCanvasElement->InvalidateCanvas();
}
// Calling Redraw() tells our invalidation machinery that the entire
// canvas is already invalid, which can speed up future drawing.
Redraw();
} else {
EnsureErrorTarget();
mTarget = sErrorTarget;
}
return mode;
}
#ifdef DEBUG
int32_t
CanvasRenderingContext2D::GetWidth() const
{
return mWidth;
}
int32_t
CanvasRenderingContext2D::GetHeight() const
{
return mHeight;
}
#endif
NS_IMETHODIMP
CanvasRenderingContext2D::SetDimensions(int32_t width, int32_t height)
{
ClearTarget();
// Zero sized surfaces can cause problems.
mZero = false;
if (height == 0) {
height = 1;
mZero = true;
}
if (width == 0) {
width = 1;
mZero = true;
}
mWidth = width;
mHeight = height;
return NS_OK;
}
void
CanvasRenderingContext2D::ClearTarget()
{
Reset();
mResetLayer = true;
// set up the initial canvas defaults
mStyleStack.Clear();
mPathBuilder = nullptr;
mPath = nullptr;
mDSPathBuilder = nullptr;
ContextState *state = mStyleStack.AppendElement();
state->globalAlpha = 1.0;
state->colorStyles[Style::FILL] = NS_RGB(0,0,0);
state->colorStyles[Style::STROKE] = NS_RGB(0,0,0);
state->shadowColor = NS_RGBA(0,0,0,0);
}
NS_IMETHODIMP
CanvasRenderingContext2D::InitializeWithSurface(nsIDocShell *shell,
gfxASurface *surface,
int32_t width,
int32_t height)
{
RemovePostRefreshObserver();
mDocShell = shell;
AddPostRefreshObserverIfNecessary();
SetDimensions(width, height);
mTarget = gfxPlatform::GetPlatform()->
CreateDrawTargetForSurface(surface, IntSize(width, height));
if (!mTarget) {
EnsureErrorTarget();
mTarget = sErrorTarget;
}
if (mTarget->GetBackendType() == mgfx::BackendType::CAIRO) {
// Cf comment in EnsureTarget
mTarget->PushClipRect(mgfx::Rect(Point(0, 0), Size(mWidth, mHeight)));
}
return NS_OK;
}
NS_IMETHODIMP
CanvasRenderingContext2D::SetIsOpaque(bool isOpaque)
{
if (isOpaque != mOpaque) {
mOpaque = isOpaque;
ClearTarget();
}
return NS_OK;
}
NS_IMETHODIMP
CanvasRenderingContext2D::SetIsIPC(bool isIPC)
{
if (isIPC != mIPC) {
mIPC = isIPC;
ClearTarget();
}
return NS_OK;
}
NS_IMETHODIMP
CanvasRenderingContext2D::SetContextOptions(JSContext* aCx, JS::Handle<JS::Value> aOptions)
{
if (aOptions.isNullOrUndefined()) {
return NS_OK;
}
// This shouldn't be called before drawing starts, so there should be no drawtarget yet
MOZ_ASSERT(!mTarget);
ContextAttributes2D attributes;
NS_ENSURE_TRUE(attributes.Init(aCx, aOptions), NS_ERROR_UNEXPECTED);
if (Preferences::GetBool("gfx.canvas.willReadFrequently.enable", false)) {
// Use software when there is going to be a lot of readback
if (attributes.mWillReadFrequently) {
mRenderingMode = RenderingMode::SoftwareBackendMode;
}
}
if (!attributes.mAlpha) {
SetIsOpaque(true);
}
return NS_OK;
}
void
CanvasRenderingContext2D::GetImageBuffer(uint8_t** aImageBuffer,
int32_t* aFormat)
{
*aImageBuffer = nullptr;
*aFormat = 0;
EnsureTarget();
RefPtr<SourceSurface> snapshot = mTarget->Snapshot();
if (!snapshot) {
return;
}
RefPtr<DataSourceSurface> data = snapshot->GetDataSurface();
if (!data || data->GetSize() != IntSize(mWidth, mHeight)) {
return;
}
*aImageBuffer = SurfaceToPackedBGRA(data);
*aFormat = imgIEncoder::INPUT_FORMAT_HOSTARGB;
}
nsString CanvasRenderingContext2D::GetHitRegion(const mozilla::gfx::Point& aPoint)
{
for (size_t x = 0 ; x < mHitRegionsOptions.Length(); x++) {
RegionInfo& info = mHitRegionsOptions[x];
if (info.mPath->ContainsPoint(aPoint, Matrix())) {
return info.mId;
}
}
return nsString();
}
NS_IMETHODIMP
CanvasRenderingContext2D::GetInputStream(const char *aMimeType,
const char16_t *aEncoderOptions,
nsIInputStream **aStream)
{
nsCString enccid("@mozilla.org/image/encoder;2?type=");
enccid += aMimeType;
nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(enccid.get());
if (!encoder) {
return NS_ERROR_FAILURE;
}
nsAutoArrayPtr<uint8_t> imageBuffer;
int32_t format = 0;
GetImageBuffer(getter_Transfers(imageBuffer), &format);
if (!imageBuffer) {
return NS_ERROR_FAILURE;
}
return ImageEncoder::GetInputStream(mWidth, mHeight, imageBuffer, format,
encoder, aEncoderOptions, aStream);
}
SurfaceFormat
CanvasRenderingContext2D::GetSurfaceFormat() const
{
return mOpaque ? SurfaceFormat::B8G8R8X8 : SurfaceFormat::B8G8R8A8;
}
//
// state
//
void
CanvasRenderingContext2D::Save()
{
EnsureTarget();
mStyleStack[mStyleStack.Length() - 1].transform = mTarget->GetTransform();
mStyleStack.SetCapacity(mStyleStack.Length() + 1);
mStyleStack.AppendElement(CurrentState());
}
void
CanvasRenderingContext2D::Restore()
{
if (mStyleStack.Length() - 1 == 0)
return;
TransformWillUpdate();
for (uint32_t i = 0; i < CurrentState().clipsPushed.size(); i++) {
mTarget->PopClip();
}
mStyleStack.RemoveElementAt(mStyleStack.Length() - 1);
mTarget->SetTransform(CurrentState().transform);
}
//
// transformations
//
void
CanvasRenderingContext2D::Scale(double x, double y, ErrorResult& error)
{
TransformWillUpdate();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix newMatrix = mTarget->GetTransform();
mTarget->SetTransform(newMatrix.PreScale(x, y));
}
void
CanvasRenderingContext2D::Rotate(double angle, ErrorResult& error)
{
TransformWillUpdate();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix rotation = Matrix::Rotation(angle);
mTarget->SetTransform(rotation * mTarget->GetTransform());
}
void
CanvasRenderingContext2D::Translate(double x, double y, ErrorResult& error)
{
TransformWillUpdate();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
mTarget->SetTransform(Matrix(mTarget->GetTransform()).PreTranslate(x, y));
}
void
CanvasRenderingContext2D::Transform(double m11, double m12, double m21,
double m22, double dx, double dy,
ErrorResult& error)
{
TransformWillUpdate();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix matrix(m11, m12, m21, m22, dx, dy);
mTarget->SetTransform(matrix * mTarget->GetTransform());
}
void
CanvasRenderingContext2D::SetTransform(double m11, double m12,
double m21, double m22,
double dx, double dy,
ErrorResult& error)
{
TransformWillUpdate();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix matrix(m11, m12, m21, m22, dx, dy);
mTarget->SetTransform(matrix);
}
static void
MatrixToJSObject(JSContext* cx, const Matrix& matrix,
JS::MutableHandle<JSObject*> result, ErrorResult& error)
{
double elts[6] = { matrix._11, matrix._12,
matrix._21, matrix._22,
matrix._31, matrix._32 };
// XXX Should we enter GetWrapper()'s compartment?
JS::Rooted<JS::Value> val(cx);
if (!ToJSValue(cx, elts, &val)) {
error.Throw(NS_ERROR_OUT_OF_MEMORY);
} else {
result.set(&val.toObject());
}
}
static bool
ObjectToMatrix(JSContext* cx, JS::Handle<JSObject*> obj, Matrix& matrix,
ErrorResult& error)
{
uint32_t length;
if (!JS_GetArrayLength(cx, obj, &length) || length != 6) {
// Not an array-like thing or wrong size
error.Throw(NS_ERROR_INVALID_ARG);
return false;
}
Float* elts[] = { &matrix._11, &matrix._12, &matrix._21, &matrix._22,
&matrix._31, &matrix._32 };
for (uint32_t i = 0; i < 6; ++i) {
JS::Rooted<JS::Value> elt(cx);
double d;
if (!JS_GetElement(cx, obj, i, &elt)) {
error.Throw(NS_ERROR_FAILURE);
return false;
}
if (!CoerceDouble(elt, &d)) {
error.Throw(NS_ERROR_INVALID_ARG);
return false;
}
if (!FloatValidate(d)) {
// This is weird, but it's the behavior of SetTransform()
return false;
}
*elts[i] = Float(d);
}
return true;
}
void
CanvasRenderingContext2D::SetMozCurrentTransform(JSContext* cx,
JS::Handle<JSObject*> currentTransform,
ErrorResult& error)
{
EnsureTarget();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix newCTM;
if (ObjectToMatrix(cx, currentTransform, newCTM, error)) {
mTarget->SetTransform(newCTM);
}
}
void
CanvasRenderingContext2D::GetMozCurrentTransform(JSContext* cx,
JS::MutableHandle<JSObject*> result,
ErrorResult& error) const
{
MatrixToJSObject(cx, mTarget ? mTarget->GetTransform() : Matrix(),
result, error);
}
void
CanvasRenderingContext2D::SetMozCurrentTransformInverse(JSContext* cx,
JS::Handle<JSObject*> currentTransform,
ErrorResult& error)
{
EnsureTarget();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return;
}
Matrix newCTMInverse;
if (ObjectToMatrix(cx, currentTransform, newCTMInverse, error)) {
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
if (newCTMInverse.Invert()) {
mTarget->SetTransform(newCTMInverse);
}
}
}
void
CanvasRenderingContext2D::GetMozCurrentTransformInverse(JSContext* cx,
JS::MutableHandle<JSObject*> result,
ErrorResult& error) const
{
if (!mTarget) {
MatrixToJSObject(cx, Matrix(), result, error);
return;
}
Matrix ctm = mTarget->GetTransform();
if (!ctm.Invert()) {
double NaN = JS_GetNaNValue(cx).toDouble();
ctm = Matrix(NaN, NaN, NaN, NaN, NaN, NaN);
}
MatrixToJSObject(cx, ctm, result, error);
}
//
// colors
//
void
CanvasRenderingContext2D::SetStyleFromUnion(const StringOrCanvasGradientOrCanvasPattern& value,
Style whichStyle)
{
if (value.IsString()) {
SetStyleFromString(value.GetAsString(), whichStyle);
return;
}
if (value.IsCanvasGradient()) {
SetStyleFromGradient(value.GetAsCanvasGradient(), whichStyle);
return;
}
if (value.IsCanvasPattern()) {
SetStyleFromPattern(value.GetAsCanvasPattern(), whichStyle);
return;
}
MOZ_ASSERT_UNREACHABLE("Invalid union value");
}
void
CanvasRenderingContext2D::SetFillRule(const nsAString& aString)
{
FillRule rule;
if (aString.EqualsLiteral("evenodd"))
rule = FillRule::FILL_EVEN_ODD;
else if (aString.EqualsLiteral("nonzero"))
rule = FillRule::FILL_WINDING;
else
return;
CurrentState().fillRule = rule;
}
void
CanvasRenderingContext2D::GetFillRule(nsAString& aString)
{
switch (CurrentState().fillRule) {
case FillRule::FILL_WINDING:
aString.AssignLiteral("nonzero"); break;
case FillRule::FILL_EVEN_ODD:
aString.AssignLiteral("evenodd"); break;
}
}
//
// gradients and patterns
//
already_AddRefed<CanvasGradient>
CanvasRenderingContext2D::CreateLinearGradient(double x0, double y0, double x1, double y1)
{
nsRefPtr<CanvasGradient> grad =
new CanvasLinearGradient(this, Point(x0, y0), Point(x1, y1));
return grad.forget();
}
already_AddRefed<CanvasGradient>
CanvasRenderingContext2D::CreateRadialGradient(double x0, double y0, double r0,
double x1, double y1, double r1,
ErrorResult& aError)
{
if (r0 < 0.0 || r1 < 0.0) {
aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
nsRefPtr<CanvasGradient> grad =
new CanvasRadialGradient(this, Point(x0, y0), r0, Point(x1, y1), r1);
return grad.forget();
}
already_AddRefed<CanvasPattern>
CanvasRenderingContext2D::CreatePattern(const HTMLImageOrCanvasOrVideoElement& element,
const nsAString& repeat,
ErrorResult& error)
{
CanvasPattern::RepeatMode repeatMode =
CanvasPattern::RepeatMode::NOREPEAT;
if (repeat.IsEmpty() || repeat.EqualsLiteral("repeat")) {
repeatMode = CanvasPattern::RepeatMode::REPEAT;
} else if (repeat.EqualsLiteral("repeat-x")) {
repeatMode = CanvasPattern::RepeatMode::REPEATX;
} else if (repeat.EqualsLiteral("repeat-y")) {
repeatMode = CanvasPattern::RepeatMode::REPEATY;
} else if (repeat.EqualsLiteral("no-repeat")) {
repeatMode = CanvasPattern::RepeatMode::NOREPEAT;
} else {
error.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return nullptr;
}
Element* htmlElement;
if (element.IsHTMLCanvasElement()) {
HTMLCanvasElement* canvas = &element.GetAsHTMLCanvasElement();
htmlElement = canvas;
nsIntSize size = canvas->GetSize();
if (size.width == 0 || size.height == 0) {
error.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Special case for Canvas, which could be an Azure canvas!
nsICanvasRenderingContextInternal *srcCanvas = canvas->GetContextAtIndex(0);
if (srcCanvas) {
// This might not be an Azure canvas!
RefPtr<SourceSurface> srcSurf = srcCanvas->GetSurfaceSnapshot();
nsRefPtr<CanvasPattern> pat =
new CanvasPattern(this, srcSurf, repeatMode, htmlElement->NodePrincipal(), canvas->IsWriteOnly(), false);
return pat.forget();
}
} else if (element.IsHTMLImageElement()) {
HTMLImageElement* img = &element.GetAsHTMLImageElement();
if (img->IntrinsicState().HasState(NS_EVENT_STATE_BROKEN)) {
error.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
htmlElement = img;
} else {
htmlElement = &element.GetAsHTMLVideoElement();
}
EnsureTarget();
// The canvas spec says that createPattern should use the first frame
// of animated images
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromElement(htmlElement,
nsLayoutUtils::SFE_WANT_FIRST_FRAME, mTarget);
if (!res.mSourceSurface) {
error.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
nsRefPtr<CanvasPattern> pat =
new CanvasPattern(this, res.mSourceSurface, repeatMode, res.mPrincipal,
res.mIsWriteOnly, res.mCORSUsed);
return pat.forget();
}
//
// shadows
//
void
CanvasRenderingContext2D::SetShadowColor(const nsAString& shadowColor)
{
nscolor color;
if (!ParseColor(shadowColor, &color)) {
return;
}
CurrentState().shadowColor = color;
}
//
// filters
//
static already_AddRefed<StyleRule>
CreateStyleRule(nsINode* aNode,
const nsCSSProperty aProp1, const nsAString& aValue1, bool* aChanged1,
const nsCSSProperty aProp2, const nsAString& aValue2, bool* aChanged2,
ErrorResult& error)
{
nsRefPtr<StyleRule> rule;
nsIPrincipal* principal = aNode->NodePrincipal();
nsIDocument* document = aNode->OwnerDoc();
nsIURI* docURL = document->GetDocumentURI();
nsIURI* baseURL = document->GetDocBaseURI();
// Pass the CSS Loader object to the parser, to allow parser error reports
// to include the outer window ID.
nsCSSParser parser(document->CSSLoader());
error = parser.ParseStyleAttribute(EmptyString(), docURL, baseURL,
principal, getter_AddRefs(rule));
if (error.Failed()) {
return nullptr;
}
if (aProp1 != eCSSProperty_UNKNOWN) {
error = parser.ParseProperty(aProp1, aValue1, docURL, baseURL, principal,
rule->GetDeclaration(), aChanged1, false);
if (error.Failed()) {
return nullptr;
}
}
if (aProp2 != eCSSProperty_UNKNOWN) {
error = parser.ParseProperty(aProp2, aValue2, docURL, baseURL, principal,
rule->GetDeclaration(), aChanged2, false);
if (error.Failed()) {
return nullptr;
}
}
rule->RuleMatched();
return rule.forget();
}
static already_AddRefed<StyleRule>
CreateFontStyleRule(const nsAString& aFont,
nsINode* aNode,
bool* aOutFontChanged,
ErrorResult& error)
{
bool lineHeightChanged;
return CreateStyleRule(aNode,
eCSSProperty_font, aFont, aOutFontChanged,
eCSSProperty_line_height, NS_LITERAL_STRING("normal"), &lineHeightChanged,
error);
}
static already_AddRefed<nsStyleContext>
GetFontParentStyleContext(Element* aElement, nsIPresShell* presShell,
ErrorResult& error)
{
if (aElement && aElement->IsInDoc()) {
// inherit from the canvas element
return nsComputedDOMStyle::GetStyleContextForElement(aElement, nullptr,
presShell);
}
// otherwise inherit from default (10px sans-serif)
bool changed;
nsRefPtr<css::StyleRule> parentRule =
CreateFontStyleRule(NS_LITERAL_STRING("10px sans-serif"),
presShell->GetDocument(), &changed, error);
if (error.Failed()) {
return nullptr;
}
nsTArray<nsCOMPtr<nsIStyleRule>> parentRules;
parentRules.AppendElement(parentRule);
return presShell->StyleSet()->ResolveStyleForRules(nullptr, parentRules);
}
static bool
PropertyIsInheritOrInitial(StyleRule* aRule, const nsCSSProperty aProperty)
{
css::Declaration* declaration = aRule->GetDeclaration();
// We know the declaration is not !important, so we can use
// GetNormalBlock().
const nsCSSValue* filterVal =
declaration->GetNormalBlock()->ValueFor(aProperty);
return (!filterVal || (filterVal->GetUnit() == eCSSUnit_Unset ||
filterVal->GetUnit() == eCSSUnit_Inherit ||
filterVal->GetUnit() == eCSSUnit_Initial));
}
static already_AddRefed<nsStyleContext>
GetFontStyleContext(Element* aElement, const nsAString& aFont,
nsIPresShell* presShell,
nsAString& aOutUsedFont,
ErrorResult& error)
{
bool fontParsedSuccessfully = false;
nsRefPtr<css::StyleRule> rule =
CreateFontStyleRule(aFont, presShell->GetDocument(),
&fontParsedSuccessfully, error);
if (error.Failed()) {
return nullptr;
}
if (!fontParsedSuccessfully) {
// We got a syntax error. The spec says this value must be ignored.
return nullptr;
}
// In addition to unparseable values, the spec says we need to reject
// 'inherit' and 'initial'. The easiest way to check for this is to look
// at font-size-adjust, which the font shorthand resets to either 'none' or
// '-moz-system-font'.
if (PropertyIsInheritOrInitial(rule, eCSSProperty_font_size_adjust)) {
return nullptr;
}
// have to get a parent style context for inherit-like relative
// values (2em, bolder, etc.)
nsRefPtr<nsStyleContext> parentContext =
GetFontParentStyleContext(aElement, presShell, error);
if (error.Failed()) {
error.Throw(NS_ERROR_FAILURE);
return nullptr;
}
nsTArray<nsCOMPtr<nsIStyleRule>> rules;
rules.AppendElement(rule);
// add a rule to prevent text zoom from affecting the style
rules.AppendElement(new nsDisableTextZoomStyleRule);
nsStyleSet* styleSet = presShell->StyleSet();
nsRefPtr<nsStyleContext> sc =
styleSet->ResolveStyleForRules(parentContext, rules);
// The font getter is required to be reserialized based on what we
// parsed (including having line-height removed). (Older drafts of
// the spec required font sizes be converted to pixels, but that no
// longer seems to be required.)
rule->GetDeclaration()->GetValue(eCSSProperty_font, aOutUsedFont);
return sc.forget();
}
static already_AddRefed<StyleRule>
CreateFilterStyleRule(const nsAString& aFilter,
nsINode* aNode,
bool* aOutFilterChanged,
ErrorResult& error)
{
bool dummy;
return CreateStyleRule(aNode,
eCSSProperty_filter, aFilter, aOutFilterChanged,
eCSSProperty_UNKNOWN, EmptyString(), &dummy,
error);
}
static already_AddRefed<nsStyleContext>
ResolveStyleForFilterRule(const nsAString& aFilterString,
nsIPresShell* aPresShell,
nsStyleContext* aParentContext,
ErrorResult& error)
{
nsIDocument* document = aPresShell->GetDocument();
bool filterChanged = false;
nsRefPtr<css::StyleRule> rule =
CreateFilterStyleRule(aFilterString, document, &filterChanged, error);
if (error.Failed()) {
return nullptr;
}
if (!filterChanged) {
// Refuse to accept the filter, but do not throw an error.
return nullptr;
}
// In addition to unparseable values, the spec says we need to reject
// 'inherit' and 'initial'.
if (PropertyIsInheritOrInitial(rule, eCSSProperty_filter)) {
return nullptr;
}
nsTArray<nsCOMPtr<nsIStyleRule>> rules;
rules.AppendElement(rule);
nsRefPtr<nsStyleContext> sc =
aPresShell->StyleSet()->ResolveStyleForRules(aParentContext, rules);
return sc.forget();
}
bool
CanvasRenderingContext2D::ParseFilter(const nsAString& aString,
nsTArray<nsStyleFilter>& aFilterChain,
ErrorResult& error)
{
if (!mCanvasElement && !mDocShell) {
NS_WARNING("Canvas element must be non-null or a docshell must be provided");
error.Throw(NS_ERROR_FAILURE);
return false;
}
nsIPresShell* presShell = GetPresShell();
if (!presShell) {
error.Throw(NS_ERROR_FAILURE);
return false;
}
nsString usedFont;
nsRefPtr<nsStyleContext> parentContext =
GetFontStyleContext(mCanvasElement, GetFont(),
presShell, usedFont, error);
if (!parentContext) {
error.Throw(NS_ERROR_FAILURE);
return false;
}
nsRefPtr<nsStyleContext> sc =
ResolveStyleForFilterRule(aString, presShell, parentContext, error);
if (!sc) {
return false;
}
aFilterChain = sc->StyleSVGReset()->mFilters;
return true;
}
class CanvasFilterChainObserver : public nsSVGFilterChainObserver
{
public:
CanvasFilterChainObserver(nsTArray<nsStyleFilter> &aFilters,
Element *aCanvasElement,
CanvasRenderingContext2D *aContext)
: nsSVGFilterChainObserver(aFilters, aCanvasElement)
, mContext(aContext)
{
}
virtual void DoUpdate() MOZ_OVERRIDE
{
// Refresh the cached FilterDescription in mContext->CurrentState().filter.
// If this filter is not at the top of the state stack, we'll refresh the
// wrong filter, but that's ok, because we'll refresh the right filter
// when we pop the state stack in CanvasRenderingContext2D::Restore().
mContext->UpdateFilter();
}
private:
CanvasRenderingContext2D *mContext;
};
void
CanvasRenderingContext2D::SetFilter(const nsAString& filter, ErrorResult& error)
{
nsTArray<nsStyleFilter> filterChain;
if (ParseFilter(filter, filterChain, error)) {
CurrentState().filterString = filter;
filterChain.SwapElements(CurrentState().filterChain);
if (mCanvasElement) {
CurrentState().filterChainObserver =
new CanvasFilterChainObserver(CurrentState().filterChain,
mCanvasElement, this);
UpdateFilter();
}
}
}
class CanvasUserSpaceMetrics : public UserSpaceMetricsWithSize
{
public:
CanvasUserSpaceMetrics(const gfx::IntSize& aSize, const nsFont& aFont,
nsIAtom* aFontLanguage, nsPresContext* aPresContext)
: mSize(aSize)
, mFont(aFont)
, mFontLanguage(aFontLanguage)
, mPresContext(aPresContext)
{
}
virtual float GetEmLength() const MOZ_OVERRIDE
{
return NSAppUnitsToFloatPixels(mFont.size,
nsPresContext::AppUnitsPerCSSPixel());
}
virtual float GetExLength() const MOZ_OVERRIDE
{
gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
nsRefPtr<nsFontMetrics> fontMetrics;
nsDeviceContext* dc = mPresContext->DeviceContext();
dc->GetMetricsFor(mFont, mFontLanguage, gfxFont::eHorizontal,
nullptr, tp,
*getter_AddRefs(fontMetrics));
return NSAppUnitsToFloatPixels(fontMetrics->XHeight(),
nsPresContext::AppUnitsPerCSSPixel());
}
virtual gfx::Size GetSize() const MOZ_OVERRIDE
{ return Size(mSize); }
private:
gfx::IntSize mSize;
const nsFont& mFont;
nsIAtom* mFontLanguage;
nsPresContext* mPresContext;
};
void
CanvasRenderingContext2D::UpdateFilter()
{
nsIPresShell* presShell = GetPresShell();
if (!presShell || presShell->IsDestroying()) {
return;
}
CurrentState().filter =
nsFilterInstance::GetFilterDescription(mCanvasElement,
CurrentState().filterChain,
CanvasUserSpaceMetrics(IntSize(mWidth, mHeight),
CurrentState().fontFont,
CurrentState().fontLanguage,
presShell->GetPresContext()),
gfxRect(0, 0, mWidth, mHeight),
CurrentState().filterAdditionalImages);
}
//
// rects
//
void
CanvasRenderingContext2D::ClearRect(double x, double y, double w,
double h)
{
if (!mTarget) {
return;
}
mTarget->ClearRect(mgfx::Rect(x, y, w, h));
RedrawUser(gfxRect(x, y, w, h));
}
void
CanvasRenderingContext2D::FillRect(double x, double y, double w,
double h)
{
const ContextState &state = CurrentState();
if (state.patternStyles[Style::FILL]) {
CanvasPattern::RepeatMode repeat =
state.patternStyles[Style::FILL]->mRepeat;
// In the FillRect case repeat modes are easy to deal with.
bool limitx = repeat == CanvasPattern::RepeatMode::NOREPEAT || repeat == CanvasPattern::RepeatMode::REPEATY;
bool limity = repeat == CanvasPattern::RepeatMode::NOREPEAT || repeat == CanvasPattern::RepeatMode::REPEATX;
IntSize patternSize =
state.patternStyles[Style::FILL]->mSurface->GetSize();
// We always need to execute painting for non-over operators, even if
// we end up with w/h = 0.
if (limitx) {
if (x < 0) {
w += x;
if (w < 0) {
w = 0;
}
x = 0;
}
if (x + w > patternSize.width) {
w = patternSize.width - x;
if (w < 0) {
w = 0;
}
}
}
if (limity) {
if (y < 0) {
h += y;
if (h < 0) {
h = 0;
}
y = 0;
}
if (y + h > patternSize.height) {
h = patternSize.height - y;
if (h < 0) {
h = 0;
}
}
}
}
mgfx::Rect bounds;
EnsureTarget();
if (NeedToCalculateBounds()) {
bounds = mgfx::Rect(x, y, w, h);
bounds = mTarget->GetTransform().TransformBounds(bounds);
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
FillRect(mgfx::Rect(x, y, w, h),
CanvasGeneralPattern().ForStyle(this, Style::FILL, mTarget),
DrawOptions(state.globalAlpha, UsedOperation()));
RedrawUser(gfxRect(x, y, w, h));
}
void
CanvasRenderingContext2D::StrokeRect(double x, double y, double w,
double h)
{
const ContextState &state = CurrentState();
mgfx::Rect bounds;
if (!w && !h) {
return;
}
EnsureTarget();
if (!IsTargetValid()) {
return;
}
if (NeedToCalculateBounds()) {
bounds = mgfx::Rect(x - state.lineWidth / 2.0f, y - state.lineWidth / 2.0f,
w + state.lineWidth, h + state.lineWidth);
bounds = mTarget->GetTransform().TransformBounds(bounds);
}
if (!h) {
CapStyle cap = CapStyle::BUTT;
if (state.lineJoin == JoinStyle::ROUND) {
cap = CapStyle::ROUND;
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
StrokeLine(Point(x, y), Point(x + w, y),
CanvasGeneralPattern().ForStyle(this, Style::STROKE, mTarget),
StrokeOptions(state.lineWidth, state.lineJoin,
cap, state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset),
DrawOptions(state.globalAlpha, UsedOperation()));
return;
}
if (!w) {
CapStyle cap = CapStyle::BUTT;
if (state.lineJoin == JoinStyle::ROUND) {
cap = CapStyle::ROUND;
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
StrokeLine(Point(x, y), Point(x, y + h),
CanvasGeneralPattern().ForStyle(this, Style::STROKE, mTarget),
StrokeOptions(state.lineWidth, state.lineJoin,
cap, state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset),
DrawOptions(state.globalAlpha, UsedOperation()));
return;
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
StrokeRect(mgfx::Rect(x, y, w, h),
CanvasGeneralPattern().ForStyle(this, Style::STROKE, mTarget),
StrokeOptions(state.lineWidth, state.lineJoin,
state.lineCap, state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset),
DrawOptions(state.globalAlpha, UsedOperation()));
Redraw();
}
//
// path bits
//
void
CanvasRenderingContext2D::BeginPath()
{
mPath = nullptr;
mPathBuilder = nullptr;
mDSPathBuilder = nullptr;
mPathTransformWillUpdate = false;
}
void
CanvasRenderingContext2D::Fill(const CanvasWindingRule& winding)
{
EnsureUserSpacePath(winding);
if (!mPath) {
return;
}
mgfx::Rect bounds;
if (NeedToCalculateBounds()) {
bounds = mPath->GetBounds(mTarget->GetTransform());
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
Fill(mPath, CanvasGeneralPattern().ForStyle(this, Style::FILL, mTarget),
DrawOptions(CurrentState().globalAlpha, UsedOperation()));
Redraw();
}
void CanvasRenderingContext2D::Fill(const CanvasPath& path, const CanvasWindingRule& winding)
{
EnsureTarget();
RefPtr<gfx::Path> gfxpath = path.GetPath(winding, mTarget);
if (!gfxpath) {
return;
}
mgfx::Rect bounds;
if (NeedToCalculateBounds()) {
bounds = gfxpath->GetBounds(mTarget->GetTransform());
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
Fill(gfxpath, CanvasGeneralPattern().ForStyle(this, Style::FILL, mTarget),
DrawOptions(CurrentState().globalAlpha, UsedOperation()));
Redraw();
}
void
CanvasRenderingContext2D::Stroke()
{
EnsureUserSpacePath();
if (!mPath) {
return;
}
const ContextState &state = CurrentState();
StrokeOptions strokeOptions(state.lineWidth, state.lineJoin,
state.lineCap, state.miterLimit,
state.dash.Length(), state.dash.Elements(),
state.dashOffset);
mgfx::Rect bounds;
if (NeedToCalculateBounds()) {
bounds =
mPath->GetStrokedBounds(strokeOptions, mTarget->GetTransform());
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
Stroke(mPath, CanvasGeneralPattern().ForStyle(this, Style::STROKE, mTarget),
strokeOptions, DrawOptions(state.globalAlpha, UsedOperation()));
Redraw();
}
void
CanvasRenderingContext2D::Stroke(const CanvasPath& path)
{
EnsureTarget();
RefPtr<gfx::Path> gfxpath = path.GetPath(CanvasWindingRule::Nonzero, mTarget);
if (!gfxpath) {
return;
}
const ContextState &state = CurrentState();
StrokeOptions strokeOptions(state.lineWidth, state.lineJoin,
state.lineCap, state.miterLimit,
state.dash.Length(), state.dash.Elements(),
state.dashOffset);
mgfx::Rect bounds;
if (NeedToCalculateBounds()) {
bounds =
gfxpath->GetStrokedBounds(strokeOptions, mTarget->GetTransform());
}
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
Stroke(gfxpath, CanvasGeneralPattern().ForStyle(this, Style::STROKE, mTarget),
strokeOptions, DrawOptions(state.globalAlpha, UsedOperation()));
Redraw();
}
void CanvasRenderingContext2D::DrawFocusIfNeeded(mozilla::dom::Element& aElement)
{
EnsureUserSpacePath();
if (!mPath) {
return;
}
if(DrawCustomFocusRing(aElement)) {
Save();
// set state to conforming focus state
ContextState& state = CurrentState();
state.globalAlpha = 1.0;
state.shadowBlur = 0;
state.shadowOffset.x = 0;
state.shadowOffset.y = 0;
state.op = mozilla::gfx::CompositionOp::OP_OVER;
state.lineCap = CapStyle::BUTT;
state.lineJoin = mozilla::gfx::JoinStyle::MITER_OR_BEVEL;
state.lineWidth = 1;
CurrentState().dash.Clear();
// color and style of the rings is the same as for image maps
// set the background focus color
CurrentState().SetColorStyle(Style::STROKE, NS_RGBA(255, 255, 255, 255));
// draw the focus ring
Stroke();
// set dashing for foreground
FallibleTArray<mozilla::gfx::Float>& dash = CurrentState().dash;
dash.AppendElement(1);
dash.AppendElement(1);
// set the foreground focus color
CurrentState().SetColorStyle(Style::STROKE, NS_RGBA(0,0,0, 255));
// draw the focus ring
Stroke();
Restore();
}
}
bool CanvasRenderingContext2D::DrawCustomFocusRing(mozilla::dom::Element& aElement)
{
EnsureUserSpacePath();
HTMLCanvasElement* canvas = GetCanvas();
if (!canvas|| !nsContentUtils::ContentIsDescendantOf(&aElement, canvas)) {
return false;
}
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
// check that the element i focused
nsCOMPtr<nsIDOMElement> focusedElement;
fm->GetFocusedElement(getter_AddRefs(focusedElement));
if (SameCOMIdentity(aElement.AsDOMNode(), focusedElement)) {
nsPIDOMWindow *window = aElement.OwnerDoc()->GetWindow();
if (window) {
return window->ShouldShowFocusRing();
}
}
}
return false;
}
void
CanvasRenderingContext2D::Clip(const CanvasWindingRule& winding)
{
EnsureUserSpacePath(winding);
if (!mPath) {
return;
}
mTarget->PushClip(mPath);
CurrentState().clipsPushed.push_back(mPath);
}
void
CanvasRenderingContext2D::Clip(const CanvasPath& path, const CanvasWindingRule& winding)
{
EnsureTarget();
RefPtr<gfx::Path> gfxpath = path.GetPath(winding, mTarget);
if (!gfxpath) {
return;
}
mTarget->PushClip(gfxpath);
CurrentState().clipsPushed.push_back(gfxpath);
}
void
CanvasRenderingContext2D::ArcTo(double x1, double y1, double x2,
double y2, double radius,
ErrorResult& error)
{
if (radius < 0) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
EnsureWritablePath();
// Current point in user space!
Point p0;
if (mPathBuilder) {
p0 = mPathBuilder->CurrentPoint();
} else {
Matrix invTransform = mTarget->GetTransform();
if (!invTransform.Invert()) {
return;
}
p0 = invTransform * mDSPathBuilder->CurrentPoint();
}
Point p1(x1, y1);
Point p2(x2, y2);
// Execute these calculations in double precision to avoid cumulative
// rounding errors.
double dir, a2, b2, c2, cosx, sinx, d, anx, any,
bnx, bny, x3, y3, x4, y4, cx, cy, angle0, angle1;
bool anticlockwise;
if (p0 == p1 || p1 == p2 || radius == 0) {
LineTo(p1.x, p1.y);
return;
}
// Check for colinearity
dir = (p2.x - p1.x) * (p0.y - p1.y) + (p2.y - p1.y) * (p1.x - p0.x);
if (dir == 0) {
LineTo(p1.x, p1.y);
return;
}
// XXX - Math for this code was already available from the non-azure code
// and would be well tested. Perhaps converting to bezier directly might
// be more efficient longer run.
a2 = (p0.x-x1)*(p0.x-x1) + (p0.y-y1)*(p0.y-y1);
b2 = (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2);
c2 = (p0.x-x2)*(p0.x-x2) + (p0.y-y2)*(p0.y-y2);
cosx = (a2+b2-c2)/(2*sqrt(a2*b2));
sinx = sqrt(1 - cosx*cosx);
d = radius / ((1 - cosx) / sinx);
anx = (x1-p0.x) / sqrt(a2);
any = (y1-p0.y) / sqrt(a2);
bnx = (x1-x2) / sqrt(b2);
bny = (y1-y2) / sqrt(b2);
x3 = x1 - anx*d;
y3 = y1 - any*d;
x4 = x1 - bnx*d;
y4 = y1 - bny*d;
anticlockwise = (dir < 0);
cx = x3 + any*radius*(anticlockwise ? 1 : -1);
cy = y3 - anx*radius*(anticlockwise ? 1 : -1);
angle0 = atan2((y3-cy), (x3-cx));
angle1 = atan2((y4-cy), (x4-cx));
LineTo(x3, y3);
Arc(cx, cy, radius, angle0, angle1, anticlockwise, error);
}
void
CanvasRenderingContext2D::Arc(double x, double y, double r,
double startAngle, double endAngle,
bool anticlockwise, ErrorResult& error)
{
if (r < 0.0) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
EnsureWritablePath();
ArcToBezier(this, Point(x, y), Size(r, r), startAngle, endAngle, anticlockwise);
}
void
CanvasRenderingContext2D::Rect(double x, double y, double w, double h)
{
EnsureWritablePath();
if (mPathBuilder) {
mPathBuilder->MoveTo(Point(x, y));
mPathBuilder->LineTo(Point(x + w, y));
mPathBuilder->LineTo(Point(x + w, y + h));
mPathBuilder->LineTo(Point(x, y + h));
mPathBuilder->Close();
} else {
mDSPathBuilder->MoveTo(mTarget->GetTransform() * Point(x, y));
mDSPathBuilder->LineTo(mTarget->GetTransform() * Point(x + w, y));
mDSPathBuilder->LineTo(mTarget->GetTransform() * Point(x + w, y + h));
mDSPathBuilder->LineTo(mTarget->GetTransform() * Point(x, y + h));
mDSPathBuilder->Close();
}
}
void
CanvasRenderingContext2D::EnsureWritablePath()
{
if (mDSPathBuilder) {
return;
}
FillRule fillRule = CurrentState().fillRule;
if (mPathBuilder) {
if (mPathTransformWillUpdate) {
mPath = mPathBuilder->Finish();
mDSPathBuilder =
mPath->TransformedCopyToBuilder(mPathToDS, fillRule);
mPath = nullptr;
mPathBuilder = nullptr;
mPathTransformWillUpdate = false;
}
return;
}
EnsureTarget();
if (!mPath) {
NS_ASSERTION(!mPathTransformWillUpdate, "mPathTransformWillUpdate should be false, if all paths are null");
mPathBuilder = mTarget->CreatePathBuilder(fillRule);
} else if (!mPathTransformWillUpdate) {
mPathBuilder = mPath->CopyToBuilder(fillRule);
} else {
mDSPathBuilder =
mPath->TransformedCopyToBuilder(mPathToDS, fillRule);
mPathTransformWillUpdate = false;
mPath = nullptr;
}
}
void
CanvasRenderingContext2D::EnsureUserSpacePath(const CanvasWindingRule& winding)
{
FillRule fillRule = CurrentState().fillRule;
if(winding == CanvasWindingRule::Evenodd)
fillRule = FillRule::FILL_EVEN_ODD;
if (!mPath && !mPathBuilder && !mDSPathBuilder) {
EnsureTarget();
mPathBuilder = mTarget->CreatePathBuilder(fillRule);
}
if (mPathBuilder) {
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
}
if (mPath &&
mPathTransformWillUpdate) {
mDSPathBuilder =
mPath->TransformedCopyToBuilder(mPathToDS, fillRule);
mPath = nullptr;
mPathTransformWillUpdate = false;
}
if (mDSPathBuilder) {
RefPtr<Path> dsPath;
dsPath = mDSPathBuilder->Finish();
mDSPathBuilder = nullptr;
Matrix inverse = mTarget->GetTransform();
if (!inverse.Invert()) {
NS_WARNING("Could not invert transform");
return;
}
mPathBuilder =
dsPath->TransformedCopyToBuilder(inverse, fillRule);
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
}
if (mPath && mPath->GetFillRule() != fillRule) {
mPathBuilder = mPath->CopyToBuilder(fillRule);
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
}
NS_ASSERTION(mPath, "mPath should exist");
}
void
CanvasRenderingContext2D::TransformWillUpdate()
{
EnsureTarget();
// Store the matrix that would transform the current path to device
// space.
if (mPath || mPathBuilder) {
if (!mPathTransformWillUpdate) {
// If the transform has already been updated, but a device space builder
// has not been created yet mPathToDS contains the right transform to
// transform the current mPath into device space.
// We should leave it alone.
mPathToDS = mTarget->GetTransform();
}
mPathTransformWillUpdate = true;
}
}
//
// text
//
void
CanvasRenderingContext2D::SetFont(const nsAString& font,
ErrorResult& error)
{
/*
* If font is defined with relative units (e.g. ems) and the parent
* style context changes in between calls, setting the font to the
* same value as previous could result in a different computed value,
* so we cannot have the optimization where we check if the new font
* string is equal to the old one.
*/
if (!mCanvasElement && !mDocShell) {
NS_WARNING("Canvas element must be non-null or a docshell must be provided");
error.Throw(NS_ERROR_FAILURE);
return;
}
nsIPresShell* presShell = GetPresShell();
if (!presShell) {
error.Throw(NS_ERROR_FAILURE);
return;
}
nsString usedFont;
nsRefPtr<nsStyleContext> sc =
GetFontStyleContext(mCanvasElement, font, presShell, usedFont, error);
if (!sc) {
return;
}
const nsStyleFont* fontStyle = sc->StyleFont();
nsIAtom* language = sc->StyleFont()->mLanguage;
if (!language) {
language = presShell->GetPresContext()->GetLanguageFromCharset();
}
// use CSS pixels instead of dev pixels to avoid being affected by page zoom
const uint32_t aupcp = nsPresContext::AppUnitsPerCSSPixel();
bool printerFont = (presShell->GetPresContext()->Type() == nsPresContext::eContext_PrintPreview ||
presShell->GetPresContext()->Type() == nsPresContext::eContext_Print);
// Purposely ignore the font size that respects the user's minimum
// font preference (fontStyle->mFont.size) in favor of the computed
// size (fontStyle->mSize). See
// https://bugzilla.mozilla.org/show_bug.cgi?id=698652.
MOZ_ASSERT(!fontStyle->mAllowZoom,
"expected text zoom to be disabled on this nsStyleFont");
gfxFontStyle style(fontStyle->mFont.style,
fontStyle->mFont.weight,
fontStyle->mFont.stretch,
NSAppUnitsToFloatPixels(fontStyle->mSize, float(aupcp)),
language,
fontStyle->mFont.sizeAdjust,
fontStyle->mFont.systemFont,
printerFont,
fontStyle->mFont.synthesis & NS_FONT_SYNTHESIS_WEIGHT,
fontStyle->mFont.synthesis & NS_FONT_SYNTHESIS_STYLE,
fontStyle->mFont.languageOverride);
fontStyle->mFont.AddFontFeaturesToStyle(&style);
nsPresContext *c = presShell->GetPresContext();
CurrentState().fontGroup =
gfxPlatform::GetPlatform()->CreateFontGroup(fontStyle->mFont.fontlist,
&style,
c->GetUserFontSet());
NS_ASSERTION(CurrentState().fontGroup, "Could not get font group");
CurrentState().fontGroup->SetTextPerfMetrics(c->GetTextPerfMetrics());
CurrentState().font = usedFont;
CurrentState().fontFont = fontStyle->mFont;
CurrentState().fontFont.size = fontStyle->mSize;
CurrentState().fontLanguage = fontStyle->mLanguage;
}
void
CanvasRenderingContext2D::SetTextAlign(const nsAString& ta)
{
if (ta.EqualsLiteral("start"))
CurrentState().textAlign = TextAlign::START;
else if (ta.EqualsLiteral("end"))
CurrentState().textAlign = TextAlign::END;
else if (ta.EqualsLiteral("left"))
CurrentState().textAlign = TextAlign::LEFT;
else if (ta.EqualsLiteral("right"))
CurrentState().textAlign = TextAlign::RIGHT;
else if (ta.EqualsLiteral("center"))
CurrentState().textAlign = TextAlign::CENTER;
}
void
CanvasRenderingContext2D::GetTextAlign(nsAString& ta)
{
switch (CurrentState().textAlign)
{
case TextAlign::START:
ta.AssignLiteral("start");
break;
case TextAlign::END:
ta.AssignLiteral("end");
break;
case TextAlign::LEFT:
ta.AssignLiteral("left");
break;
case TextAlign::RIGHT:
ta.AssignLiteral("right");
break;
case TextAlign::CENTER:
ta.AssignLiteral("center");
break;
}
}
void
CanvasRenderingContext2D::SetTextBaseline(const nsAString& tb)
{
if (tb.EqualsLiteral("top"))
CurrentState().textBaseline = TextBaseline::TOP;
else if (tb.EqualsLiteral("hanging"))
CurrentState().textBaseline = TextBaseline::HANGING;
else if (tb.EqualsLiteral("middle"))
CurrentState().textBaseline = TextBaseline::MIDDLE;
else if (tb.EqualsLiteral("alphabetic"))
CurrentState().textBaseline = TextBaseline::ALPHABETIC;
else if (tb.EqualsLiteral("ideographic"))
CurrentState().textBaseline = TextBaseline::IDEOGRAPHIC;
else if (tb.EqualsLiteral("bottom"))
CurrentState().textBaseline = TextBaseline::BOTTOM;
}
void
CanvasRenderingContext2D::GetTextBaseline(nsAString& tb)
{
switch (CurrentState().textBaseline)
{
case TextBaseline::TOP:
tb.AssignLiteral("top");
break;
case TextBaseline::HANGING:
tb.AssignLiteral("hanging");
break;
case TextBaseline::MIDDLE:
tb.AssignLiteral("middle");
break;
case TextBaseline::ALPHABETIC:
tb.AssignLiteral("alphabetic");
break;
case TextBaseline::IDEOGRAPHIC:
tb.AssignLiteral("ideographic");
break;
case TextBaseline::BOTTOM:
tb.AssignLiteral("bottom");
break;
}
}
/*
* Helper function that replaces the whitespace characters in a string
* with U+0020 SPACE. The whitespace characters are defined as U+0020 SPACE,
* U+0009 CHARACTER TABULATION (tab), U+000A LINE FEED (LF), U+000B LINE
* TABULATION, U+000C FORM FEED (FF), and U+000D CARRIAGE RETURN (CR).
* @param str The string whose whitespace characters to replace.
*/
static inline void
TextReplaceWhitespaceCharacters(nsAutoString& str)
{
str.ReplaceChar("\x09\x0A\x0B\x0C\x0D", char16_t(' '));
}
void
CanvasRenderingContext2D::FillText(const nsAString& text, double x,
double y,
const Optional<double>& maxWidth,
ErrorResult& error)
{
error = DrawOrMeasureText(text, x, y, maxWidth, TextDrawOperation::FILL, nullptr);
}
void
CanvasRenderingContext2D::StrokeText(const nsAString& text, double x,
double y,
const Optional<double>& maxWidth,
ErrorResult& error)
{
error = DrawOrMeasureText(text, x, y, maxWidth, TextDrawOperation::STROKE, nullptr);
}
TextMetrics*
CanvasRenderingContext2D::MeasureText(const nsAString& rawText,
ErrorResult& error)
{
float width;
Optional<double> maxWidth;
error = DrawOrMeasureText(rawText, 0, 0, maxWidth, TextDrawOperation::MEASURE, &width);
if (error.Failed()) {
return nullptr;
}
return new TextMetrics(width);
}
void
CanvasRenderingContext2D::AddHitRegion(const HitRegionOptions& options, ErrorResult& error)
{
// check if the path is valid
EnsureUserSpacePath(CanvasWindingRule::Nonzero);
if(!mPath) {
error.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
// get the bounds of the current path. They are relative to the canvas
mgfx::Rect bounds(mPath->GetBounds(mTarget->GetTransform()));
if ((bounds.width == 0) || (bounds.height == 0) || !bounds.IsFinite()) {
// The specified region has no pixels.
error.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
// remove old hit region first
RemoveHitRegion(options.mId);
if (options.mControl) {
// also remove regions with this control
for (size_t x = 0; x < mHitRegionsOptions.Length(); x++) {
RegionInfo& info = mHitRegionsOptions[x];
if (info.mElement == options.mControl) {
mHitRegionsOptions.RemoveElementAt(x);
break;
}
}
#ifdef ACCESSIBILITY
options.mControl->SetProperty(nsGkAtoms::hitregion, new bool(true),
nsINode::DeleteProperty<bool>);
#endif
}
// finally, add the region to the list
RegionInfo info;
info.mId = options.mId;
info.mElement = options.mControl;
RefPtr<PathBuilder> pathBuilder = mPath->TransformedCopyToBuilder(mTarget->GetTransform());
info.mPath = pathBuilder->Finish();
mHitRegionsOptions.InsertElementAt(0, info);
}
void
CanvasRenderingContext2D::RemoveHitRegion(const nsAString& id)
{
if (id.Length() == 0) {
return;
}
for (size_t x = 0; x < mHitRegionsOptions.Length(); x++) {
RegionInfo& info = mHitRegionsOptions[x];
if (info.mId == id) {
mHitRegionsOptions.RemoveElementAt(x);
return;
}
}
}
bool
CanvasRenderingContext2D::GetHitRegionRect(Element* aElement, nsRect& aRect)
{
for (unsigned int x = 0; x < mHitRegionsOptions.Length(); x++) {
RegionInfo& info = mHitRegionsOptions[x];
if (info.mElement == aElement) {
mgfx::Rect bounds(info.mPath->GetBounds());
gfxRect rect(bounds.x, bounds.y, bounds.width, bounds.height);
aRect = nsLayoutUtils::RoundGfxRectToAppRect(rect, AppUnitsPerCSSPixel());
return true;
}
}
return false;
}
/**
* Used for nsBidiPresUtils::ProcessText
*/
struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcessor
{
typedef CanvasRenderingContext2D::ContextState ContextState;
virtual void SetText(const char16_t* text, int32_t length, nsBidiDirection direction)
{
mFontgrp->UpdateUserFonts(); // ensure user font generation is current
// adjust flags for current direction run
uint32_t flags = mTextRunFlags;
if (direction & 1) {
flags |= gfxTextRunFactory::TEXT_IS_RTL;
} else {
flags &= ~gfxTextRunFactory::TEXT_IS_RTL;
}
mTextRun = mFontgrp->MakeTextRun(text,
length,
mThebes,
mAppUnitsPerDevPixel,
flags);
}
virtual nscoord GetWidth()
{
gfxTextRun::Metrics textRunMetrics = mTextRun->MeasureText(0,
mTextRun->GetLength(),
mDoMeasureBoundingBox ?
gfxFont::TIGHT_INK_EXTENTS :
gfxFont::LOOSE_INK_EXTENTS,
mThebes,
nullptr);
// this only measures the height; the total width is gotten from the
// the return value of ProcessText.
if (mDoMeasureBoundingBox) {
textRunMetrics.mBoundingBox.Scale(1.0 / mAppUnitsPerDevPixel);
mBoundingBox = mBoundingBox.Union(textRunMetrics.mBoundingBox);
}
return NSToCoordRound(textRunMetrics.mAdvanceWidth);
}
virtual void DrawText(nscoord xOffset, nscoord width)
{
gfxPoint point = mPt;
bool rtl = mTextRun->IsRightToLeft();
bool verticalRun = mTextRun->IsVertical();
gfxFloat& inlineCoord = verticalRun ? point.y : point.x;
inlineCoord += xOffset;
// offset is given in terms of left side of string
if (rtl) {
// Bug 581092 - don't use rounded pixel width to advance to
// right-hand end of run, because this will cause different
// glyph positioning for LTR vs RTL drawing of the same
// glyph string on OS X and DWrite where textrun widths may
// involve fractional pixels.
gfxTextRun::Metrics textRunMetrics =
mTextRun->MeasureText(0,
mTextRun->GetLength(),
mDoMeasureBoundingBox ?
gfxFont::TIGHT_INK_EXTENTS :
gfxFont::LOOSE_INK_EXTENTS,
mThebes,
nullptr);
inlineCoord += textRunMetrics.mAdvanceWidth;
// old code was:
// point.x += width * mAppUnitsPerDevPixel;
// TODO: restore this if/when we move to fractional coords
// throughout the text layout process
}
uint32_t numRuns;
const gfxTextRun::GlyphRun *runs = mTextRun->GetGlyphRuns(&numRuns);
const int32_t appUnitsPerDevUnit = mAppUnitsPerDevPixel;
const double devUnitsPerAppUnit = 1.0/double(appUnitsPerDevUnit);
Point baselineOrigin =
Point(point.x * devUnitsPerAppUnit, point.y * devUnitsPerAppUnit);
float advanceSum = 0;
mCtx->EnsureTarget();
for (uint32_t c = 0; c < numRuns; c++) {
gfxFont *font = runs[c].mFont;
bool verticalFont =
runs[c].mOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
const float& baselineOriginInline =
verticalFont ? baselineOrigin.y : baselineOrigin.x;
const float& baselineOriginBlock =
verticalFont ? baselineOrigin.x : baselineOrigin.y;
uint32_t endRun = 0;
if (c + 1 < numRuns) {
endRun = runs[c + 1].mCharacterOffset;
} else {
endRun = mTextRun->GetLength();
}
const gfxTextRun::CompressedGlyph *glyphs = mTextRun->GetCharacterGlyphs();
RefPtr<ScaledFont> scaledFont =
gfxPlatform::GetPlatform()->GetScaledFontForFont(mCtx->mTarget, font);
if (!scaledFont) {
// This can occur when something switched DirectWrite off.
return;
}
AutoRestoreTransform sidewaysRestore;
if (runs[c].mOrientation ==
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT) {
sidewaysRestore.Init(mCtx->mTarget);
// TODO: The baseline adjustment here is kinda ad-hoc; eventually
// perhaps we should check for horizontal and vertical baseline data
// in the font, and adjust accordingly.
// (The same will be true for HTML text layout.)
const gfxFont::Metrics& metrics = mTextRun->GetFontGroup()->
GetFirstValidFont()->GetMetrics(gfxFont::eHorizontal);
mCtx->mTarget->SetTransform(mCtx->mTarget->GetTransform().Copy().
PreTranslate(baselineOrigin). // translate origin for rotation
PreRotate(gfx::Float(M_PI / 2.0)). // turn 90deg clockwise
PreTranslate(-baselineOrigin). // undo the translation
PreTranslate(Point(0, metrics.emAscent - metrics.emDescent) / 2));
// and offset the (alphabetic) baseline of the
// horizontally-shaped text from the (centered)
// default baseline used for vertical
}
RefPtr<GlyphRenderingOptions> renderingOptions = font->GetGlyphRenderingOptions();
GlyphBuffer buffer;
std::vector<Glyph> glyphBuf;
// TODO:
// This more-or-less duplicates the code found in gfxTextRun::Draw
// and the gfxFont methods that uses (Draw, DrawGlyphs, DrawOneGlyph);
// it would be nice to refactor and share that code.
for (uint32_t i = runs[c].mCharacterOffset; i < endRun; i++) {
Glyph newGlyph;
float& inlinePos =
verticalFont ? newGlyph.mPosition.y : newGlyph.mPosition.x;
float& blockPos =
verticalFont ? newGlyph.mPosition.x : newGlyph.mPosition.y;
if (glyphs[i].IsSimpleGlyph()) {
newGlyph.mIndex = glyphs[i].GetSimpleGlyph();
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
glyphs[i].GetSimpleAdvance() * devUnitsPerAppUnit;
} else {
inlinePos = baselineOriginInline + advanceSum;
}
blockPos = baselineOriginBlock;
advanceSum += glyphs[i].GetSimpleAdvance() * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
continue;
}
if (!glyphs[i].GetGlyphCount()) {
continue;
}
const gfxTextRun::DetailedGlyph *d = mTextRun->GetDetailedGlyphs(i);
if (glyphs[i].IsMissing()) {
newGlyph.mIndex = 0;
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
d->mAdvance * devUnitsPerAppUnit;
} else {
inlinePos = baselineOriginInline + advanceSum;
}
blockPos = baselineOriginBlock;
advanceSum += d->mAdvance * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
continue;
}
for (uint32_t c = 0; c < glyphs[i].GetGlyphCount(); c++, d++) {
newGlyph.mIndex = d->mGlyphID;
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
d->mAdvance * devUnitsPerAppUnit;
} else {
inlinePos = baselineOriginInline + advanceSum;
}
inlinePos += d->mXOffset * devUnitsPerAppUnit;
blockPos = baselineOriginBlock + d->mYOffset * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
advanceSum += d->mAdvance * devUnitsPerAppUnit;
}
}
if (!glyphBuf.size()) {
// This may happen for glyph runs for a 0 size font.
continue;
}
buffer.mGlyphs = &glyphBuf.front();
buffer.mNumGlyphs = glyphBuf.size();
Rect bounds = mCtx->mTarget->GetTransform().
TransformBounds(Rect(mBoundingBox.x, mBoundingBox.y,
mBoundingBox.width, mBoundingBox.height));
if (mOp == CanvasRenderingContext2D::TextDrawOperation::FILL) {
AdjustedTarget(mCtx, &bounds)->
FillGlyphs(scaledFont, buffer,
CanvasGeneralPattern().
ForStyle(mCtx, CanvasRenderingContext2D::Style::FILL, mCtx->mTarget),
DrawOptions(mState->globalAlpha, mCtx->UsedOperation()),
renderingOptions);
} else if (mOp == CanvasRenderingContext2D::TextDrawOperation::STROKE) {
// stroke glyphs one at a time to avoid poor CoreGraphics performance
// when stroking a path with a very large number of points
buffer.mGlyphs = &glyphBuf.front();
buffer.mNumGlyphs = 1;
const ContextState& state = *mState;
AdjustedTarget target(mCtx, &bounds);
const StrokeOptions strokeOpts(state.lineWidth, state.lineJoin,
state.lineCap, state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset);
CanvasGeneralPattern cgp;
const Pattern& patForStyle
(cgp.ForStyle(mCtx, CanvasRenderingContext2D::Style::STROKE, mCtx->mTarget));
const DrawOptions drawOpts(state.globalAlpha, mCtx->UsedOperation());
for (unsigned i = glyphBuf.size(); i > 0; --i) {
RefPtr<Path> path = scaledFont->GetPathForGlyphs(buffer, mCtx->mTarget);
target->Stroke(path, patForStyle, strokeOpts, drawOpts);
buffer.mGlyphs++;
}
}
}
}
// current text run
nsAutoPtr<gfxTextRun> mTextRun;
// pointer to a screen reference context used to measure text and such
nsRefPtr<gfxContext> mThebes;
// Pointer to the draw target we should fill our text to
CanvasRenderingContext2D *mCtx;
// position of the left side of the string, alphabetic baseline
gfxPoint mPt;
// current font
gfxFontGroup* mFontgrp;
// dev pixel conversion factor
int32_t mAppUnitsPerDevPixel;
// operation (fill or stroke)
CanvasRenderingContext2D::TextDrawOperation mOp;
// context state
ContextState *mState;
// union of bounding boxes of all runs, needed for shadows
gfxRect mBoundingBox;
// flags to use when creating textrun, based on CSS style
uint32_t mTextRunFlags;
// true iff the bounding box should be measured
bool mDoMeasureBoundingBox;
};
nsresult
CanvasRenderingContext2D::DrawOrMeasureText(const nsAString& aRawText,
float aX,
float aY,
const Optional<double>& aMaxWidth,
TextDrawOperation aOp,
float* aWidth)
{
nsresult rv;
// spec isn't clear on what should happen if aMaxWidth <= 0, so
// treat it as an invalid argument
// technically, 0 should be an invalid value as well, but 0 is the default
// arg, and there is no way to tell if the default was used
if (aMaxWidth.WasPassed() && aMaxWidth.Value() < 0)
return NS_ERROR_INVALID_ARG;
if (!mCanvasElement && !mDocShell) {
NS_WARNING("Canvas element must be non-null or a docshell must be provided");
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIPresShell> presShell = GetPresShell();
if (!presShell)
return NS_ERROR_FAILURE;
nsIDocument* document = presShell->GetDocument();
// replace all the whitespace characters with U+0020 SPACE
nsAutoString textToDraw(aRawText);
TextReplaceWhitespaceCharacters(textToDraw);
// for now, default to ltr if not in doc
bool isRTL = false;
nsRefPtr<nsStyleContext> canvasStyle;
if (mCanvasElement && mCanvasElement->IsInDoc()) {
// try to find the closest context
canvasStyle =
nsComputedDOMStyle::GetStyleContextForElement(mCanvasElement,
nullptr,
presShell);
if (!canvasStyle) {
return NS_ERROR_FAILURE;
}
isRTL = canvasStyle->StyleVisibility()->mDirection ==
NS_STYLE_DIRECTION_RTL;
} else {
isRTL = GET_BIDI_OPTION_DIRECTION(document->GetBidiOptions()) == IBMBIDI_TEXTDIRECTION_RTL;
}
gfxFontGroup* currentFontStyle = GetCurrentFontStyle();
NS_ASSERTION(currentFontStyle, "font group is null");
// ensure user font set is up to date
currentFontStyle->
SetUserFontSet(presShell->GetPresContext()->GetUserFontSet());
if (currentFontStyle->GetStyle()->size == 0.0F) {
if (aWidth) {
*aWidth = 0;
}
return NS_OK;
}
const ContextState &state = CurrentState();
// This is only needed to know if we can know the drawing bounding box easily.
bool doCalculateBounds = NeedToCalculateBounds();
CanvasBidiProcessor processor;
// If we don't have a style context, we can't set up vertical-text flags
// (for now, at least; perhaps we need new Canvas API to control this).
processor.mTextRunFlags = canvasStyle ?
nsLayoutUtils::GetTextRunFlagsForStyle(canvasStyle,
canvasStyle->StyleFont(),
canvasStyle->StyleText(),
0) : 0;
GetAppUnitsValues(&processor.mAppUnitsPerDevPixel, nullptr);
processor.mPt = gfxPoint(aX, aY);
processor.mThebes =
new gfxContext(gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
// If we don't have a target then we don't have a transform. A target won't
// be needed in the case where we're measuring the text size. This allows
// to avoid creating a target if it's only being used to measure text sizes.
if (mTarget) {
Matrix matrix = mTarget->GetTransform();
processor.mThebes->SetMatrix(gfxMatrix(matrix._11, matrix._12, matrix._21, matrix._22, matrix._31, matrix._32));
}
processor.mCtx = this;
processor.mOp = aOp;
processor.mBoundingBox = gfxRect(0, 0, 0, 0);
processor.mDoMeasureBoundingBox = doCalculateBounds || !mIsEntireFrameInvalid;
processor.mState = &CurrentState();
processor.mFontgrp = currentFontStyle;
nscoord totalWidthCoord;
// calls bidi algo twice since it needs the full text width and the
// bounding boxes before rendering anything
nsBidi bidiEngine;
rv = nsBidiPresUtils::ProcessText(textToDraw.get(),
textToDraw.Length(),
isRTL ? NSBIDI_RTL : NSBIDI_LTR,
presShell->GetPresContext(),
processor,
nsBidiPresUtils::MODE_MEASURE,
nullptr,
0,
&totalWidthCoord,
&bidiEngine);
if (NS_FAILED(rv)) {
return rv;
}
float totalWidth = float(totalWidthCoord) / processor.mAppUnitsPerDevPixel;
if (aWidth) {
*aWidth = totalWidth;
}
// if only measuring, don't need to do any more work
if (aOp==TextDrawOperation::MEASURE) {
return NS_OK;
}
// offset pt.x based on text align
gfxFloat anchorX;
if (state.textAlign == TextAlign::CENTER) {
anchorX = .5;
} else if (state.textAlign == TextAlign::LEFT ||
(!isRTL && state.textAlign == TextAlign::START) ||
(isRTL && state.textAlign == TextAlign::END)) {
anchorX = 0;
} else {
anchorX = 1;
}
processor.mPt.x -= anchorX * totalWidth;
// offset pt.y based on text baseline
processor.mFontgrp->UpdateUserFonts(); // ensure user font generation is current
const gfxFont::Metrics& fontMetrics =
processor.mFontgrp->GetFirstValidFont()->GetMetrics(
processor.mTextRun->IsVertical() ? gfxFont::eVertical :
gfxFont::eHorizontal);
gfxFloat anchorY;
switch (state.textBaseline)
{
case TextBaseline::HANGING:
// fall through; best we can do with the information available
case TextBaseline::TOP:
anchorY = fontMetrics.emAscent;
break;
case TextBaseline::MIDDLE:
anchorY = (fontMetrics.emAscent - fontMetrics.emDescent) * .5f;
break;
case TextBaseline::IDEOGRAPHIC:
// fall through; best we can do with the information available
case TextBaseline::ALPHABETIC:
anchorY = 0;
break;
case TextBaseline::BOTTOM:
anchorY = -fontMetrics.emDescent;
break;
default:
MOZ_CRASH("unexpected TextBaseline");
}
processor.mPt.y += anchorY;
// correct bounding box to get it to be the correct size/position
processor.mBoundingBox.width = totalWidth;
processor.mBoundingBox.MoveBy(processor.mPt);
processor.mPt.x *= processor.mAppUnitsPerDevPixel;
processor.mPt.y *= processor.mAppUnitsPerDevPixel;
EnsureTarget();
Matrix oldTransform = mTarget->GetTransform();
// if text is over aMaxWidth, then scale the text horizontally such that its
// width is precisely aMaxWidth
if (aMaxWidth.WasPassed() && aMaxWidth.Value() > 0 &&
totalWidth > aMaxWidth.Value()) {
Matrix newTransform = oldTransform;
// Translate so that the anchor point is at 0,0, then scale and then
// translate back.
newTransform.PreTranslate(aX, 0);
newTransform.PreScale(aMaxWidth.Value() / totalWidth, 1);
newTransform.PreTranslate(-aX, 0);
/* we do this to avoid an ICE in the android compiler */
Matrix androidCompilerBug = newTransform;
mTarget->SetTransform(androidCompilerBug);
}
// save the previous bounding box
gfxRect boundingBox = processor.mBoundingBox;
// don't ever need to measure the bounding box twice
processor.mDoMeasureBoundingBox = false;
rv = nsBidiPresUtils::ProcessText(textToDraw.get(),
textToDraw.Length(),
isRTL ? NSBIDI_RTL : NSBIDI_LTR,
presShell->GetPresContext(),
processor,
nsBidiPresUtils::MODE_DRAW,
nullptr,
0,
nullptr,
&bidiEngine);
mTarget->SetTransform(oldTransform);
if (aOp == CanvasRenderingContext2D::TextDrawOperation::FILL &&
!doCalculateBounds) {
RedrawUser(boundingBox);
return NS_OK;
}
Redraw();
return NS_OK;
}
gfxFontGroup *CanvasRenderingContext2D::GetCurrentFontStyle()
{
// use lazy initilization for the font group since it's rather expensive
if (!CurrentState().fontGroup) {
ErrorResult err;
NS_NAMED_LITERAL_STRING(kDefaultFontStyle, "10px sans-serif");
static float kDefaultFontSize = 10.0;
SetFont(kDefaultFontStyle, err);
if (err.Failed()) {
gfxFontStyle style;
style.size = kDefaultFontSize;
CurrentState().fontGroup =
gfxPlatform::GetPlatform()->CreateFontGroup(FontFamilyList(eFamily_sans_serif),
&style,
nullptr);
if (CurrentState().fontGroup) {
CurrentState().font = kDefaultFontStyle;
nsIPresShell* presShell = GetPresShell();
if (presShell) {
CurrentState().fontGroup->SetTextPerfMetrics(
presShell->GetPresContext()->GetTextPerfMetrics());
}
} else {
NS_ERROR("Default canvas font is invalid");
}
}
}
return CurrentState().fontGroup;
}
//
// line caps/joins
//
void
CanvasRenderingContext2D::SetLineCap(const nsAString& capstyle)
{
CapStyle cap;
if (capstyle.EqualsLiteral("butt")) {
cap = CapStyle::BUTT;
} else if (capstyle.EqualsLiteral("round")) {
cap = CapStyle::ROUND;
} else if (capstyle.EqualsLiteral("square")) {
cap = CapStyle::SQUARE;
} else {
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
return;
}
CurrentState().lineCap = cap;
}
void
CanvasRenderingContext2D::GetLineCap(nsAString& capstyle)
{
switch (CurrentState().lineCap) {
case CapStyle::BUTT:
capstyle.AssignLiteral("butt");
break;
case CapStyle::ROUND:
capstyle.AssignLiteral("round");
break;
case CapStyle::SQUARE:
capstyle.AssignLiteral("square");
break;
}
}
void
CanvasRenderingContext2D::SetLineJoin(const nsAString& joinstyle)
{
JoinStyle j;
if (joinstyle.EqualsLiteral("round")) {
j = JoinStyle::ROUND;
} else if (joinstyle.EqualsLiteral("bevel")) {
j = JoinStyle::BEVEL;
} else if (joinstyle.EqualsLiteral("miter")) {
j = JoinStyle::MITER_OR_BEVEL;
} else {
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
return;
}
CurrentState().lineJoin = j;
}
void
CanvasRenderingContext2D::GetLineJoin(nsAString& joinstyle, ErrorResult& error)
{
switch (CurrentState().lineJoin) {
case JoinStyle::ROUND:
joinstyle.AssignLiteral("round");
break;
case JoinStyle::BEVEL:
joinstyle.AssignLiteral("bevel");
break;
case JoinStyle::MITER_OR_BEVEL:
joinstyle.AssignLiteral("miter");
break;
default:
error.Throw(NS_ERROR_FAILURE);
}
}
void
CanvasRenderingContext2D::SetMozDash(JSContext* cx,
const JS::Value& mozDash,
ErrorResult& error)
{
FallibleTArray<Float> dash;
error = JSValToDashArray(cx, mozDash, dash);
if (!error.Failed()) {
ContextState& state = CurrentState();
state.dash = dash;
if (state.dash.IsEmpty()) {
state.dashOffset = 0;
}
}
}
void
CanvasRenderingContext2D::GetMozDash(JSContext* cx,
JS::MutableHandle<JS::Value> retval,
ErrorResult& error)
{
DashArrayToJSVal(CurrentState().dash, cx, retval, error);
}
void
CanvasRenderingContext2D::SetMozDashOffset(double mozDashOffset)
{
ContextState& state = CurrentState();
if (!state.dash.IsEmpty()) {
state.dashOffset = mozDashOffset;
}
}
void
CanvasRenderingContext2D::SetLineDash(const Sequence<double>& aSegments)
{
FallibleTArray<mozilla::gfx::Float> dash;
for (uint32_t x = 0; x < aSegments.Length(); x++) {
if (aSegments[x] < 0.0) {
// Pattern elements must be finite "numbers" >= 0, with "finite"
// taken care of by WebIDL
return;
}
dash.AppendElement(aSegments[x]);
}
if (aSegments.Length() % 2) { // If the number of elements is odd, concatenate again
for (uint32_t x = 0; x < aSegments.Length(); x++) {
dash.AppendElement(aSegments[x]);
}
}
CurrentState().dash = dash;
}
void
CanvasRenderingContext2D::GetLineDash(nsTArray<double>& aSegments) const {
const FallibleTArray<mozilla::gfx::Float>& dash = CurrentState().dash;
aSegments.Clear();
for (uint32_t x = 0; x < dash.Length(); x++) {
aSegments.AppendElement(dash[x]);
}
}
void
CanvasRenderingContext2D::SetLineDashOffset(double mOffset) {
CurrentState().dashOffset = mOffset;
}
double
CanvasRenderingContext2D::LineDashOffset() const {
return CurrentState().dashOffset;
}
bool
CanvasRenderingContext2D::IsPointInPath(double x, double y, const CanvasWindingRule& winding)
{
if (!FloatValidate(x,y)) {
return false;
}
EnsureUserSpacePath(winding);
if (!mPath) {
return false;
}
if (mPathTransformWillUpdate) {
return mPath->ContainsPoint(Point(x, y), mPathToDS);
}
return mPath->ContainsPoint(Point(x, y), mTarget->GetTransform());
}
bool CanvasRenderingContext2D::IsPointInPath(const CanvasPath& mPath, double x, double y, const CanvasWindingRule& mWinding)
{
if (!FloatValidate(x,y)) {
return false;
}
EnsureTarget();
RefPtr<gfx::Path> tempPath = mPath.GetPath(mWinding, mTarget);
return tempPath->ContainsPoint(Point(x, y), mTarget->GetTransform());
}
bool
CanvasRenderingContext2D::IsPointInStroke(double x, double y)
{
if (!FloatValidate(x,y)) {
return false;
}
EnsureUserSpacePath();
if (!mPath) {
return false;
}
const ContextState &state = CurrentState();
StrokeOptions strokeOptions(state.lineWidth,
state.lineJoin,
state.lineCap,
state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset);
if (mPathTransformWillUpdate) {
return mPath->StrokeContainsPoint(strokeOptions, Point(x, y), mPathToDS);
}
return mPath->StrokeContainsPoint(strokeOptions, Point(x, y), mTarget->GetTransform());
}
bool CanvasRenderingContext2D::IsPointInStroke(const CanvasPath& mPath, double x, double y)
{
if (!FloatValidate(x,y)) {
return false;
}
EnsureTarget();
RefPtr<gfx::Path> tempPath = mPath.GetPath(CanvasWindingRule::Nonzero, mTarget);
const ContextState &state = CurrentState();
StrokeOptions strokeOptions(state.lineWidth,
state.lineJoin,
state.lineCap,
state.miterLimit,
state.dash.Length(),
state.dash.Elements(),
state.dashOffset);
return tempPath->StrokeContainsPoint(strokeOptions, Point(x, y), mTarget->GetTransform());
}
//
// image
//
// drawImage(in HTMLImageElement image, in float dx, in float dy);
// -- render image from 0,0 at dx,dy top-left coords
// drawImage(in HTMLImageElement image, in float dx, in float dy, in float sw, in float sh);
// -- render image from 0,0 at dx,dy top-left coords clipping it to sw,sh
// drawImage(in HTMLImageElement image, in float sx, in float sy, in float sw, in float sh, in float dx, in float dy, in float dw, in float dh);
// -- render the region defined by (sx,sy,sw,wh) in image-local space into the region (dx,dy,dw,dh) on the canvas
// If only dx and dy are passed in then optional_argc should be 0. If only
// dx, dy, dw and dh are passed in then optional_argc should be 2. The only
// other valid value for optional_argc is 6 if sx, sy, sw, sh, dx, dy, dw and dh
// are all passed in.
void
CanvasRenderingContext2D::DrawImage(const HTMLImageOrCanvasOrVideoElement& image,
double sx, double sy, double sw,
double sh, double dx, double dy,
double dw, double dh,
uint8_t optional_argc,
ErrorResult& error)
{
MOZ_ASSERT(optional_argc == 0 || optional_argc == 2 || optional_argc == 6);
RefPtr<SourceSurface> srcSurf;
gfxIntSize imgSize;
Element* element;
EnsureTarget();
if (image.IsHTMLCanvasElement()) {
HTMLCanvasElement* canvas = &image.GetAsHTMLCanvasElement();
element = canvas;
nsIntSize size = canvas->GetSize();
if (size.width == 0 || size.height == 0) {
error.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
} else {
if (image.IsHTMLImageElement()) {
HTMLImageElement* img = &image.GetAsHTMLImageElement();
element = img;
} else {
HTMLVideoElement* video = &image.GetAsHTMLVideoElement();
element = video;
}
srcSurf =
CanvasImageCache::Lookup(element, mCanvasElement, &imgSize);
}
nsLayoutUtils::DirectDrawInfo drawInfo;
if (!srcSurf) {
// The canvas spec says that drawImage should draw the first frame
// of animated images. We also don't want to rasterize vector images.
uint32_t sfeFlags = nsLayoutUtils::SFE_WANT_FIRST_FRAME |
nsLayoutUtils::SFE_NO_RASTERIZING_VECTORS;
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromElement(element, sfeFlags, mTarget);
if (!res.mSourceSurface && !res.mDrawInfo.mImgContainer) {
// Spec says to silently do nothing if the element is still loading.
if (!res.mIsStillLoading) {
error.Throw(NS_ERROR_NOT_AVAILABLE);
}
return;
}
imgSize = res.mSize;
// Scale sw/sh based on aspect ratio
if (image.IsHTMLVideoElement()) {
HTMLVideoElement* video = &image.GetAsHTMLVideoElement();
int32_t displayWidth = video->VideoWidth();
int32_t displayHeight = video->VideoHeight();
sw *= (double)imgSize.width / (double)displayWidth;
sh *= (double)imgSize.height / (double)displayHeight;
}
if (mCanvasElement) {
CanvasUtils::DoDrawImageSecurityCheck(mCanvasElement,
res.mPrincipal, res.mIsWriteOnly,
res.mCORSUsed);
}
if (res.mSourceSurface) {
if (res.mImageRequest) {
CanvasImageCache::NotifyDrawImage(element, mCanvasElement, res.mImageRequest,
res.mSourceSurface, imgSize);
}
srcSurf = res.mSourceSurface;
} else {
drawInfo = res.mDrawInfo;
}
}
if (optional_argc == 0) {
sx = sy = 0.0;
dw = sw = (double) imgSize.width;
dh = sh = (double) imgSize.height;
} else if (optional_argc == 2) {
sx = sy = 0.0;
sw = (double) imgSize.width;
sh = (double) imgSize.height;
}
if (sw == 0.0 || sh == 0.0) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
if (dw == 0.0 || dh == 0.0) {
// not really failure, but nothing to do --
// and noone likes a divide-by-zero
return;
}
if (sx < 0.0 || sy < 0.0 ||
sw < 0.0 || sw > (double) imgSize.width ||
sh < 0.0 || sh > (double) imgSize.height ||
dw < 0.0 || dh < 0.0) {
// XXX - Unresolved spec issues here, for now return error.
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
Filter filter;
if (CurrentState().imageSmoothingEnabled)
filter = mgfx::Filter::LINEAR;
else
filter = mgfx::Filter::POINT;
mgfx::Rect bounds;
if (NeedToCalculateBounds()) {
bounds = mgfx::Rect(dx, dy, dw, dh);
bounds = mTarget->GetTransform().TransformBounds(bounds);
}
if (srcSurf) {
AdjustedTarget(this, bounds.IsEmpty() ? nullptr : &bounds)->
DrawSurface(srcSurf,
mgfx::Rect(dx, dy, dw, dh),
mgfx::Rect(sx, sy, sw, sh),
DrawSurfaceOptions(filter),
DrawOptions(CurrentState().globalAlpha, UsedOperation()));
} else {
DrawDirectlyToCanvas(drawInfo, &bounds,
mgfx::Rect(dx, dy, dw, dh),
mgfx::Rect(sx, sy, sw, sh),
imgSize);
}
RedrawUser(gfxRect(dx, dy, dw, dh));
}
void
CanvasRenderingContext2D::DrawDirectlyToCanvas(
const nsLayoutUtils::DirectDrawInfo& image,
mgfx::Rect* bounds,
mgfx::Rect dest,
mgfx::Rect src,
gfxIntSize imgSize)
{
MOZ_ASSERT(src.width > 0 && src.height > 0,
"Need positive source width and height");
gfxMatrix contextMatrix;
AdjustedTarget tempTarget(this, bounds->IsEmpty() ? nullptr: bounds);
// Get any existing transforms on the context, including transformations used
// for context shadow.
if (tempTarget) {
Matrix matrix = tempTarget->GetTransform();
contextMatrix = gfxMatrix(matrix._11, matrix._12, matrix._21,
matrix._22, matrix._31, matrix._32);
}
gfxSize contextScale(contextMatrix.ScaleFactors(true));
// Scale the dest rect to include the context scale.
dest.Scale(contextScale.width, contextScale.height);
// Scale the image size to the dest rect, and adjust the source rect to match.
gfxSize scale(dest.width / src.width, dest.height / src.height);
nsIntSize scaledImageSize(std::ceil(imgSize.width * scale.width),
std::ceil(imgSize.height * scale.height));
src.Scale(scale.width, scale.height);
// We're wrapping tempTarget's (our) DrawTarget here, so we need to restore
// the matrix even though this is a temp gfxContext.
AutoRestoreTransform autoRestoreTransform(mTarget);
nsRefPtr<gfxContext> context = new gfxContext(tempTarget);
context->SetMatrix(contextMatrix.
Scale(1.0 / contextScale.width,
1.0 / contextScale.height).
Translate(dest.x - src.x, dest.y - src.y));
// FLAG_CLAMP is added for increased performance, since we never tile here.
uint32_t modifiedFlags = image.mDrawingFlags | imgIContainer::FLAG_CLAMP;
SVGImageContext svgContext(scaledImageSize, Nothing(), CurrentState().globalAlpha);
nsresult rv = image.mImgContainer->
Draw(context, scaledImageSize,
ImageRegion::Create(gfxRect(src.x, src.y, src.width, src.height)),
image.mWhichFrame, GraphicsFilter::FILTER_GOOD,
Some(svgContext), modifiedFlags);
NS_ENSURE_SUCCESS_VOID(rv);
}
void
CanvasRenderingContext2D::SetGlobalCompositeOperation(const nsAString& op,
ErrorResult& error)
{
CompositionOp comp_op;
#define CANVAS_OP_TO_GFX_OP(cvsop, op2d) \
if (op.EqualsLiteral(cvsop)) \
comp_op = CompositionOp::OP_##op2d;
CANVAS_OP_TO_GFX_OP("copy", SOURCE)
else CANVAS_OP_TO_GFX_OP("source-atop", ATOP)
else CANVAS_OP_TO_GFX_OP("source-in", IN)
else CANVAS_OP_TO_GFX_OP("source-out", OUT)
else CANVAS_OP_TO_GFX_OP("source-over", OVER)
else CANVAS_OP_TO_GFX_OP("destination-in", DEST_IN)
else CANVAS_OP_TO_GFX_OP("destination-out", DEST_OUT)
else CANVAS_OP_TO_GFX_OP("destination-over", DEST_OVER)
else CANVAS_OP_TO_GFX_OP("destination-atop", DEST_ATOP)
else CANVAS_OP_TO_GFX_OP("lighter", ADD)
else CANVAS_OP_TO_GFX_OP("xor", XOR)
else CANVAS_OP_TO_GFX_OP("multiply", MULTIPLY)
else CANVAS_OP_TO_GFX_OP("screen", SCREEN)
else CANVAS_OP_TO_GFX_OP("overlay", OVERLAY)
else CANVAS_OP_TO_GFX_OP("darken", DARKEN)
else CANVAS_OP_TO_GFX_OP("lighten", LIGHTEN)
else CANVAS_OP_TO_GFX_OP("color-dodge", COLOR_DODGE)
else CANVAS_OP_TO_GFX_OP("color-burn", COLOR_BURN)
else CANVAS_OP_TO_GFX_OP("hard-light", HARD_LIGHT)
else CANVAS_OP_TO_GFX_OP("soft-light", SOFT_LIGHT)
else CANVAS_OP_TO_GFX_OP("difference", DIFFERENCE)
else CANVAS_OP_TO_GFX_OP("exclusion", EXCLUSION)
else CANVAS_OP_TO_GFX_OP("hue", HUE)
else CANVAS_OP_TO_GFX_OP("saturation", SATURATION)
else CANVAS_OP_TO_GFX_OP("color", COLOR)
else CANVAS_OP_TO_GFX_OP("luminosity", LUMINOSITY)
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
else return;
#undef CANVAS_OP_TO_GFX_OP
CurrentState().op = comp_op;
}
void
CanvasRenderingContext2D::GetGlobalCompositeOperation(nsAString& op,
ErrorResult& error)
{
CompositionOp comp_op = CurrentState().op;
#define CANVAS_OP_TO_GFX_OP(cvsop, op2d) \
if (comp_op == CompositionOp::OP_##op2d) \
op.AssignLiteral(cvsop);
CANVAS_OP_TO_GFX_OP("copy", SOURCE)
else CANVAS_OP_TO_GFX_OP("destination-atop", DEST_ATOP)
else CANVAS_OP_TO_GFX_OP("destination-in", DEST_IN)
else CANVAS_OP_TO_GFX_OP("destination-out", DEST_OUT)
else CANVAS_OP_TO_GFX_OP("destination-over", DEST_OVER)
else CANVAS_OP_TO_GFX_OP("lighter", ADD)
else CANVAS_OP_TO_GFX_OP("source-atop", ATOP)
else CANVAS_OP_TO_GFX_OP("source-in", IN)
else CANVAS_OP_TO_GFX_OP("source-out", OUT)
else CANVAS_OP_TO_GFX_OP("source-over", OVER)
else CANVAS_OP_TO_GFX_OP("xor", XOR)
else CANVAS_OP_TO_GFX_OP("multiply", MULTIPLY)
else CANVAS_OP_TO_GFX_OP("screen", SCREEN)
else CANVAS_OP_TO_GFX_OP("overlay", OVERLAY)
else CANVAS_OP_TO_GFX_OP("darken", DARKEN)
else CANVAS_OP_TO_GFX_OP("lighten", LIGHTEN)
else CANVAS_OP_TO_GFX_OP("color-dodge", COLOR_DODGE)
else CANVAS_OP_TO_GFX_OP("color-burn", COLOR_BURN)
else CANVAS_OP_TO_GFX_OP("hard-light", HARD_LIGHT)
else CANVAS_OP_TO_GFX_OP("soft-light", SOFT_LIGHT)
else CANVAS_OP_TO_GFX_OP("difference", DIFFERENCE)
else CANVAS_OP_TO_GFX_OP("exclusion", EXCLUSION)
else CANVAS_OP_TO_GFX_OP("hue", HUE)
else CANVAS_OP_TO_GFX_OP("saturation", SATURATION)
else CANVAS_OP_TO_GFX_OP("color", COLOR)
else CANVAS_OP_TO_GFX_OP("luminosity", LUMINOSITY)
else {
error.Throw(NS_ERROR_FAILURE);
}
#undef CANVAS_OP_TO_GFX_OP
}
void
CanvasRenderingContext2D::DrawWindow(nsGlobalWindow& window, double x,
double y, double w, double h,
const nsAString& bgColor,
uint32_t flags, ErrorResult& error)
{
// protect against too-large surfaces that will cause allocation
// or overflow issues
if (!gfxASurface::CheckSurfaceSize(gfxIntSize(int32_t(w), int32_t(h)),
0xffff)) {
error.Throw(NS_ERROR_FAILURE);
return;
}
EnsureTarget();
// We can't allow web apps to call this until we fix at least the
// following potential security issues:
// -- rendering cross-domain IFRAMEs and then extracting the results
// -- rendering the user's theme and then extracting the results
// -- rendering native anonymous content (e.g., file input paths;
// scrollbars should be allowed)
if (!nsContentUtils::IsCallerChrome()) {
// not permitted to use DrawWindow
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
error.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
// Flush layout updates
if (!(flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DO_NOT_FLUSH)) {
nsContentUtils::FlushLayoutForTree(&window);
}
nsRefPtr<nsPresContext> presContext;
nsIDocShell* docshell = window.GetDocShell();
if (docshell) {
docshell->GetPresContext(getter_AddRefs(presContext));
}
if (!presContext) {
error.Throw(NS_ERROR_FAILURE);
return;
}
nscolor backgroundColor;
if (!ParseColor(bgColor, &backgroundColor)) {
error.Throw(NS_ERROR_FAILURE);
return;
}
nsRect r(nsPresContext::CSSPixelsToAppUnits((float)x),
nsPresContext::CSSPixelsToAppUnits((float)y),
nsPresContext::CSSPixelsToAppUnits((float)w),
nsPresContext::CSSPixelsToAppUnits((float)h));
uint32_t renderDocFlags = (nsIPresShell::RENDER_IGNORE_VIEWPORT_SCROLLING |
nsIPresShell::RENDER_DOCUMENT_RELATIVE);
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DRAW_CARET) {
renderDocFlags |= nsIPresShell::RENDER_CARET;
}
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DRAW_VIEW) {
renderDocFlags &= ~(nsIPresShell::RENDER_IGNORE_VIEWPORT_SCROLLING |
nsIPresShell::RENDER_DOCUMENT_RELATIVE);
}
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_USE_WIDGET_LAYERS) {
renderDocFlags |= nsIPresShell::RENDER_USE_WIDGET_LAYERS;
}
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_ASYNC_DECODE_IMAGES) {
renderDocFlags |= nsIPresShell::RENDER_ASYNC_DECODE_IMAGES;
}
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DO_NOT_FLUSH) {
renderDocFlags |= nsIPresShell::RENDER_DRAWWINDOW_NOT_FLUSHING;
}
// gfxContext-over-Azure may modify the DrawTarget's transform, so
// save and restore it
Matrix matrix = mTarget->GetTransform();
double sw = matrix._11 * w;
double sh = matrix._22 * h;
if (!sw || !sh) {
return;
}
nsRefPtr<gfxContext> thebes;
RefPtr<DrawTarget> drawDT;
// Rendering directly is faster and can be done if mTarget supports Azure
// and does not need alpha blending.
if (gfxPlatform::GetPlatform()->SupportsAzureContentForDrawTarget(mTarget) &&
GlobalAlpha() == 1.0f)
{
thebes = new gfxContext(mTarget);
thebes->SetMatrix(gfxMatrix(matrix._11, matrix._12, matrix._21,
matrix._22, matrix._31, matrix._32));
} else {
drawDT =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(IntSize(ceil(sw), ceil(sh)),
SurfaceFormat::B8G8R8A8);
if (!drawDT) {
error.Throw(NS_ERROR_FAILURE);
return;
}
thebes = new gfxContext(drawDT);
thebes->SetMatrix(gfxMatrix::Scaling(matrix._11, matrix._22));
}
nsCOMPtr<nsIPresShell> shell = presContext->PresShell();
unused << shell->RenderDocument(r, renderDocFlags, backgroundColor, thebes);
if (drawDT) {
RefPtr<SourceSurface> snapshot = drawDT->Snapshot();
RefPtr<DataSourceSurface> data = snapshot->GetDataSurface();
RefPtr<SourceSurface> source =
mTarget->CreateSourceSurfaceFromData(data->GetData(),
data->GetSize(),
data->Stride(),
data->GetFormat());
if (!source) {
error.Throw(NS_ERROR_FAILURE);
return;
}
mgfx::Rect destRect(0, 0, w, h);
mgfx::Rect sourceRect(0, 0, sw, sh);
mTarget->DrawSurface(source, destRect, sourceRect,
DrawSurfaceOptions(mgfx::Filter::POINT),
DrawOptions(GlobalAlpha(), CompositionOp::OP_OVER,
AntialiasMode::NONE));
mTarget->Flush();
} else {
mTarget->SetTransform(matrix);
}
// note that x and y are coordinates in the document that
// we're drawing; x and y are drawn to 0,0 in current user
// space.
RedrawUser(gfxRect(0, 0, w, h));
}
void
CanvasRenderingContext2D::AsyncDrawXULElement(nsXULElement& elem,
double x, double y,
double w, double h,
const nsAString& bgColor,
uint32_t flags,
ErrorResult& error)
{
// We can't allow web apps to call this until we fix at least the
// following potential security issues:
// -- rendering cross-domain IFRAMEs and then extracting the results
// -- rendering the user's theme and then extracting the results
// -- rendering native anonymous content (e.g., file input paths;
// scrollbars should be allowed)
if (!nsContentUtils::IsCallerChrome()) {
// not permitted to use DrawWindow
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
error.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
#if 0
nsCOMPtr<nsIFrameLoaderOwner> loaderOwner = do_QueryInterface(&elem);
if (!loaderOwner) {
error.Throw(NS_ERROR_FAILURE);
return;
}
nsRefPtr<nsFrameLoader> frameloader = loaderOwner->GetFrameLoader();
if (!frameloader) {
error.Throw(NS_ERROR_FAILURE);
return;
}
PBrowserParent *child = frameloader->GetRemoteBrowser();
if (!child) {
nsIDocShell* docShell = frameLoader->GetExistingDocShell();
if (!docShell) {
error.Throw(NS_ERROR_FAILURE);
return;
}
nsCOMPtr<nsIDOMWindow> window = docShell->GetWindow();
if (!window) {
error.Throw(NS_ERROR_FAILURE);
return;
}
return DrawWindow(window, x, y, w, h, bgColor, flags);
}
// protect against too-large surfaces that will cause allocation
// or overflow issues
if (!gfxASurface::CheckSurfaceSize(gfxIntSize(w, h), 0xffff)) {
error.Throw(NS_ERROR_FAILURE);
return;
}
bool flush =
(flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DO_NOT_FLUSH) == 0;
uint32_t renderDocFlags = nsIPresShell::RENDER_IGNORE_VIEWPORT_SCROLLING;
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DRAW_CARET) {
renderDocFlags |= nsIPresShell::RENDER_CARET;
}
if (flags & nsIDOMCanvasRenderingContext2D::DRAWWINDOW_DRAW_VIEW) {
renderDocFlags &= ~nsIPresShell::RENDER_IGNORE_VIEWPORT_SCROLLING;
}
nsRect rect(nsPresContext::CSSPixelsToAppUnits(x),
nsPresContext::CSSPixelsToAppUnits(y),
nsPresContext::CSSPixelsToAppUnits(w),
nsPresContext::CSSPixelsToAppUnits(h));
if (mIPC) {
PDocumentRendererParent *pdocrender =
child->SendPDocumentRendererConstructor(rect,
mThebes->CurrentMatrix(),
nsString(aBGColor),
renderDocFlags, flush,
nsIntSize(mWidth, mHeight));
if (!pdocrender)
return NS_ERROR_FAILURE;
DocumentRendererParent *docrender =
static_cast<DocumentRendererParent *>(pdocrender);
docrender->SetCanvasContext(this, mThebes);
}
#endif
}
//
// device pixel getting/setting
//
already_AddRefed<ImageData>
CanvasRenderingContext2D::GetImageData(JSContext* aCx, double aSx,
double aSy, double aSw,
double aSh, ErrorResult& error)
{
EnsureTarget();
if (!IsTargetValid()) {
error.Throw(NS_ERROR_FAILURE);
return nullptr;
}
if (!mCanvasElement && !mDocShell) {
NS_ERROR("No canvas element and no docshell in GetImageData!!!");
error.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
// Check only if we have a canvas element; if we were created with a docshell,
// then it's special internal use.
if (mCanvasElement && mCanvasElement->IsWriteOnly() &&
!nsContentUtils::IsCallerChrome())
{
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
error.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
if (!IsFinite(aSx) || !IsFinite(aSy) ||
!IsFinite(aSw) || !IsFinite(aSh)) {
error.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
if (!aSw || !aSh) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
int32_t x = JS_DoubleToInt32(aSx);
int32_t y = JS_DoubleToInt32(aSy);
int32_t wi = JS_DoubleToInt32(aSw);
int32_t hi = JS_DoubleToInt32(aSh);
// Handle negative width and height by flipping the rectangle over in the
// relevant direction.
uint32_t w, h;
if (aSw < 0) {
w = -wi;
x -= w;
} else {
w = wi;
}
if (aSh < 0) {
h = -hi;
y -= h;
} else {
h = hi;
}
if (w == 0) {
w = 1;
}
if (h == 0) {
h = 1;
}
JS::Rooted<JSObject*> array(aCx);
error = GetImageDataArray(aCx, x, y, w, h, array.address());
if (error.Failed()) {
return nullptr;
}
MOZ_ASSERT(array);
nsRefPtr<ImageData> imageData = new ImageData(w, h, *array);
return imageData.forget();
}
nsresult
CanvasRenderingContext2D::GetImageDataArray(JSContext* aCx,
int32_t aX,
int32_t aY,
uint32_t aWidth,
uint32_t aHeight,
JSObject** aRetval)
{
MOZ_ASSERT(aWidth && aHeight);
CheckedInt<uint32_t> len = CheckedInt<uint32_t>(aWidth) * aHeight * 4;
if (!len.isValid()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
CheckedInt<int32_t> rightMost = CheckedInt<int32_t>(aX) + aWidth;
CheckedInt<int32_t> bottomMost = CheckedInt<int32_t>(aY) + aHeight;
if (!rightMost.isValid() || !bottomMost.isValid()) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
IntRect srcRect(0, 0, mWidth, mHeight);
IntRect destRect(aX, aY, aWidth, aHeight);
IntRect srcReadRect = srcRect.Intersect(destRect);
RefPtr<DataSourceSurface> readback;
if (!srcReadRect.IsEmpty() && !mZero) {
RefPtr<SourceSurface> snapshot = mTarget->Snapshot();
if (snapshot) {
readback = snapshot->GetDataSurface();
}
if (!readback || !readback->GetData()) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
JS::Rooted<JSObject*> darray(aCx, JS_NewUint8ClampedArray(aCx, len.value()));
if (!darray) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (mZero) {
*aRetval = darray;
return NS_OK;
}
uint8_t* data = JS_GetUint8ClampedArrayData(darray);
IntRect dstWriteRect = srcReadRect;
dstWriteRect.MoveBy(-aX, -aY);
uint8_t* src = data;
uint32_t srcStride = aWidth * 4;
if (readback) {
srcStride = readback->Stride();
src = readback->GetData() + srcReadRect.y * srcStride + srcReadRect.x * 4;
}
// NOTE! dst is the same as src, and this relies on reading
// from src and advancing that ptr before writing to dst.
// NOTE! I'm not sure that it is, I think this comment might have been
// inherited from Thebes canvas and is no longer true
uint8_t* dst = data + dstWriteRect.y * (aWidth * 4) + dstWriteRect.x * 4;
if (mOpaque) {
for (int32_t j = 0; j < dstWriteRect.height; ++j) {
for (int32_t i = 0; i < dstWriteRect.width; ++i) {
// XXX Is there some useful swizzle MMX we can use here?
#if MOZ_LITTLE_ENDIAN
uint8_t b = *src++;
uint8_t g = *src++;
uint8_t r = *src++;
src++;
#else
src++;
uint8_t r = *src++;
uint8_t g = *src++;
uint8_t b = *src++;
#endif
*dst++ = r;
*dst++ = g;
*dst++ = b;
*dst++ = 255;
}
src += srcStride - (dstWriteRect.width * 4);
dst += (aWidth * 4) - (dstWriteRect.width * 4);
}
} else
for (int32_t j = 0; j < dstWriteRect.height; ++j) {
for (int32_t i = 0; i < dstWriteRect.width; ++i) {
// XXX Is there some useful swizzle MMX we can use here?
#if MOZ_LITTLE_ENDIAN
uint8_t b = *src++;
uint8_t g = *src++;
uint8_t r = *src++;
uint8_t a = *src++;
#else
uint8_t a = *src++;
uint8_t r = *src++;
uint8_t g = *src++;
uint8_t b = *src++;
#endif
// Convert to non-premultiplied color
*dst++ = gfxUtils::sUnpremultiplyTable[a * 256 + r];
*dst++ = gfxUtils::sUnpremultiplyTable[a * 256 + g];
*dst++ = gfxUtils::sUnpremultiplyTable[a * 256 + b];
*dst++ = a;
}
src += srcStride - (dstWriteRect.width * 4);
dst += (aWidth * 4) - (dstWriteRect.width * 4);
}
*aRetval = darray;
return NS_OK;
}
void
CanvasRenderingContext2D::EnsureErrorTarget()
{
if (sErrorTarget) {
return;
}
RefPtr<DrawTarget> errorTarget = gfxPlatform::GetPlatform()->CreateOffscreenCanvasDrawTarget(IntSize(1, 1), SurfaceFormat::B8G8R8A8);
MOZ_ASSERT(errorTarget, "Failed to allocate the error target!");
sErrorTarget = errorTarget;
NS_ADDREF(sErrorTarget);
}
void
CanvasRenderingContext2D::FillRuleChanged()
{
if (mPath) {
mPathBuilder = mPath->CopyToBuilder(CurrentState().fillRule);
mPath = nullptr;
}
}
void
CanvasRenderingContext2D::PutImageData(ImageData& imageData, double dx,
double dy, ErrorResult& error)
{
dom::Uint8ClampedArray arr;
DebugOnly<bool> inited = arr.Init(imageData.GetDataObject());
MOZ_ASSERT(inited);
error = PutImageData_explicit(JS_DoubleToInt32(dx), JS_DoubleToInt32(dy),
imageData.Width(), imageData.Height(),
&arr, false, 0, 0, 0, 0);
}
void
CanvasRenderingContext2D::PutImageData(ImageData& imageData, double dx,
double dy, double dirtyX,
double dirtyY, double dirtyWidth,
double dirtyHeight,
ErrorResult& error)
{
dom::Uint8ClampedArray arr;
DebugOnly<bool> inited = arr.Init(imageData.GetDataObject());
MOZ_ASSERT(inited);
error = PutImageData_explicit(JS_DoubleToInt32(dx), JS_DoubleToInt32(dy),
imageData.Width(), imageData.Height(),
&arr, true,
JS_DoubleToInt32(dirtyX),
JS_DoubleToInt32(dirtyY),
JS_DoubleToInt32(dirtyWidth),
JS_DoubleToInt32(dirtyHeight));
}
// void putImageData (in ImageData d, in float x, in float y);
// void putImageData (in ImageData d, in double x, in double y, in double dirtyX, in double dirtyY, in double dirtyWidth, in double dirtyHeight);
nsresult
CanvasRenderingContext2D::PutImageData_explicit(int32_t x, int32_t y, uint32_t w, uint32_t h,
dom::Uint8ClampedArray* aArray,
bool hasDirtyRect, int32_t dirtyX, int32_t dirtyY,
int32_t dirtyWidth, int32_t dirtyHeight)
{
if (w == 0 || h == 0) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
IntRect dirtyRect;
IntRect imageDataRect(0, 0, w, h);
if (hasDirtyRect) {
// fix up negative dimensions
if (dirtyWidth < 0) {
NS_ENSURE_TRUE(dirtyWidth != INT_MIN, NS_ERROR_DOM_INDEX_SIZE_ERR);
CheckedInt32 checkedDirtyX = CheckedInt32(dirtyX) + dirtyWidth;
if (!checkedDirtyX.isValid())
return NS_ERROR_DOM_INDEX_SIZE_ERR;
dirtyX = checkedDirtyX.value();
dirtyWidth = -dirtyWidth;
}
if (dirtyHeight < 0) {
NS_ENSURE_TRUE(dirtyHeight != INT_MIN, NS_ERROR_DOM_INDEX_SIZE_ERR);
CheckedInt32 checkedDirtyY = CheckedInt32(dirtyY) + dirtyHeight;
if (!checkedDirtyY.isValid())
return NS_ERROR_DOM_INDEX_SIZE_ERR;
dirtyY = checkedDirtyY.value();
dirtyHeight = -dirtyHeight;
}
// bound the dirty rect within the imageData rectangle
dirtyRect = imageDataRect.Intersect(IntRect(dirtyX, dirtyY, dirtyWidth, dirtyHeight));
if (dirtyRect.Width() <= 0 || dirtyRect.Height() <= 0)
return NS_OK;
} else {
dirtyRect = imageDataRect;
}
dirtyRect.MoveBy(IntPoint(x, y));
dirtyRect = IntRect(0, 0, mWidth, mHeight).Intersect(dirtyRect);
if (dirtyRect.Width() <= 0 || dirtyRect.Height() <= 0) {
return NS_OK;
}
aArray->ComputeLengthAndData();
uint32_t dataLen = aArray->Length();
uint32_t len = w * h * 4;
if (dataLen != len) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
nsRefPtr<gfxImageSurface> imgsurf = new gfxImageSurface(gfxIntSize(w, h),
gfxImageFormat::ARGB32,
false);
if (!imgsurf || imgsurf->CairoStatus()) {
return NS_ERROR_FAILURE;
}
uint8_t *src = aArray->Data();
uint8_t *dst = imgsurf->Data();
for (uint32_t j = 0; j < h; j++) {
for (uint32_t i = 0; i < w; i++) {
uint8_t r = *src++;
uint8_t g = *src++;
uint8_t b = *src++;
uint8_t a = *src++;
// Convert to premultiplied color (losslessly if the input came from getImageData)
#if MOZ_LITTLE_ENDIAN
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + b];
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + g];
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + r];
*dst++ = a;
#else
*dst++ = a;
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + r];
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + g];
*dst++ = gfxUtils::sPremultiplyTable[a * 256 + b];
#endif
}
}
EnsureTarget();
if (!IsTargetValid()) {
return NS_ERROR_FAILURE;
}
RefPtr<SourceSurface> sourceSurface =
mTarget->CreateSourceSurfaceFromData(imgsurf->Data(), IntSize(w, h), imgsurf->Stride(), SurfaceFormat::B8G8R8A8);
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (!sourceSurface) {
return NS_ERROR_FAILURE;
}
mTarget->CopySurface(sourceSurface,
IntRect(dirtyRect.x - x, dirtyRect.y - y,
dirtyRect.width, dirtyRect.height),
IntPoint(dirtyRect.x, dirtyRect.y));
Redraw(mgfx::Rect(dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height));
return NS_OK;
}
static already_AddRefed<ImageData>
CreateImageData(JSContext* cx, CanvasRenderingContext2D* context,
uint32_t w, uint32_t h, ErrorResult& error)
{
if (w == 0)
w = 1;
if (h == 0)
h = 1;
CheckedInt<uint32_t> len = CheckedInt<uint32_t>(w) * h * 4;
if (!len.isValid()) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
// Create the fast typed array; it's initialized to 0 by default.
JSObject* darray = Uint8ClampedArray::Create(cx, context, len.value());
if (!darray) {
error.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
nsRefPtr<mozilla::dom::ImageData> imageData =
new mozilla::dom::ImageData(w, h, *darray);
return imageData.forget();
}
already_AddRefed<ImageData>
CanvasRenderingContext2D::CreateImageData(JSContext* cx, double sw,
double sh, ErrorResult& error)
{
if (!sw || !sh) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
int32_t wi = JS_DoubleToInt32(sw);
int32_t hi = JS_DoubleToInt32(sh);
uint32_t w = Abs(wi);
uint32_t h = Abs(hi);
return mozilla::dom::CreateImageData(cx, this, w, h, error);
}
already_AddRefed<ImageData>
CanvasRenderingContext2D::CreateImageData(JSContext* cx,
ImageData& imagedata,
ErrorResult& error)
{
return mozilla::dom::CreateImageData(cx, this, imagedata.Width(),
imagedata.Height(), error);
}
static uint8_t g2DContextLayerUserData;
already_AddRefed<CanvasLayer>
CanvasRenderingContext2D::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
CanvasLayer *aOldLayer,
LayerManager *aManager)
{
if (mOpaque) {
// If we're opaque then make sure we have a surface so we paint black
// instead of transparent.
EnsureTarget();
}
// Don't call EnsureTarget() ... if there isn't already a surface, then
// we have nothing to paint and there is no need to create a surface just
// to paint nothing. Also, EnsureTarget() can cause creation of a persistent
// layer manager which must NOT happen during a paint.
if (!mTarget || !IsTargetValid()) {
// No DidTransactionCallback will be received, so mark the context clean
// now so future invalidations will be dispatched.
MarkContextClean();
return nullptr;
}
mTarget->Flush();
if (!mResetLayer && aOldLayer) {
CanvasRenderingContext2DUserData* userData =
static_cast<CanvasRenderingContext2DUserData*>(
aOldLayer->GetUserData(&g2DContextLayerUserData));
CanvasLayer::Data data;
if (mStream) {
#ifdef USE_SKIA
SkiaGLGlue* glue = gfxPlatform::GetPlatform()->GetSkiaGLGlue();
if (glue) {
data.mGLContext = glue->GetGLContext();
data.mStream = mStream.get();
}
#endif
} else {
data.mDrawTarget = mTarget;
}
if (userData && userData->IsForContext(this) && aOldLayer->IsDataValid(data)) {
nsRefPtr<CanvasLayer> ret = aOldLayer;
return ret.forget();
}
}
nsRefPtr<CanvasLayer> canvasLayer = aManager->CreateCanvasLayer();
if (!canvasLayer) {
NS_WARNING("CreateCanvasLayer returned null!");
// No DidTransactionCallback will be received, so mark the context clean
// now so future invalidations will be dispatched.
MarkContextClean();
return nullptr;
}
CanvasRenderingContext2DUserData *userData = nullptr;
// Make the layer tell us whenever a transaction finishes (including
// the current transaction), so we can clear our invalidation state and
// start invalidating again. We need to do this for all layers since
// callers of DrawWindow may be expecting to receive normal invalidation
// notifications after this paint.
// The layer will be destroyed when we tear down the presentation
// (at the latest), at which time this userData will be destroyed,
// releasing the reference to the element.
// The userData will receive DidTransactionCallbacks, which flush the
// the invalidation state to indicate that the canvas is up to date.
userData = new CanvasRenderingContext2DUserData(this);
canvasLayer->SetDidTransactionCallback(
CanvasRenderingContext2DUserData::DidTransactionCallback, userData);
canvasLayer->SetUserData(&g2DContextLayerUserData, userData);
CanvasLayer::Data data;
if (mStream) {
SkiaGLGlue* glue = gfxPlatform::GetPlatform()->GetSkiaGLGlue();
if (glue) {
canvasLayer->SetPreTransactionCallback(
CanvasRenderingContext2DUserData::PreTransactionCallback, userData);
#if USE_SKIA
data.mGLContext = glue->GetGLContext();
#endif
data.mStream = mStream.get();
data.mTexID = (uint32_t)((uintptr_t)mTarget->GetNativeSurface(NativeSurfaceType::OPENGL_TEXTURE));
}
} else {
data.mDrawTarget = mTarget;
}
data.mSize = nsIntSize(mWidth, mHeight);
data.mHasAlpha = !mOpaque;
canvasLayer->Initialize(data);
uint32_t flags = mOpaque ? Layer::CONTENT_OPAQUE : 0;
canvasLayer->SetContentFlags(flags);
canvasLayer->Updated();
mResetLayer = false;
return canvasLayer.forget();
}
void
CanvasRenderingContext2D::MarkContextClean()
{
if (mInvalidateCount > 0) {
mPredictManyRedrawCalls = mInvalidateCount > kCanvasMaxInvalidateCount;
}
mIsEntireFrameInvalid = false;
mInvalidateCount = 0;
}
bool
CanvasRenderingContext2D::ShouldForceInactiveLayer(LayerManager *aManager)
{
return !aManager->CanUseCanvasLayerForSize(IntSize(mWidth, mHeight));
}
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CanvasPath, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CanvasPath, Release)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CanvasPath, mParent)
CanvasPath::CanvasPath(nsISupports* aParent)
: mParent(aParent)
{
mPathBuilder = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget()->CreatePathBuilder();
}
CanvasPath::CanvasPath(nsISupports* aParent, TemporaryRef<PathBuilder> aPathBuilder)
: mParent(aParent), mPathBuilder(aPathBuilder)
{
if (!mPathBuilder) {
mPathBuilder = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget()->CreatePathBuilder();
}
}
JSObject*
CanvasPath::WrapObject(JSContext* aCx)
{
return Path2DBinding::Wrap(aCx, this);
}
already_AddRefed<CanvasPath>
CanvasPath::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
{
nsRefPtr<CanvasPath> path = new CanvasPath(aGlobal.GetAsSupports());
return path.forget();
}
already_AddRefed<CanvasPath>
CanvasPath::Constructor(const GlobalObject& aGlobal, CanvasPath& aCanvasPath, ErrorResult& aRv)
{
RefPtr<gfx::Path> tempPath = aCanvasPath.GetPath(CanvasWindingRule::Nonzero,
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
nsRefPtr<CanvasPath> path = new CanvasPath(aGlobal.GetAsSupports(), tempPath->CopyToBuilder());
return path.forget();
}
already_AddRefed<CanvasPath>
CanvasPath::Constructor(const GlobalObject& aGlobal, const nsAString& aPathString, ErrorResult& aRv)
{
RefPtr<gfx::Path> tempPath = SVGContentUtils::GetPath(aPathString);
if (!tempPath) {
return Constructor(aGlobal, aRv);
}
nsRefPtr<CanvasPath> path = new CanvasPath(aGlobal.GetAsSupports(), tempPath->CopyToBuilder());
return path.forget();
}
void
CanvasPath::ClosePath()
{
EnsurePathBuilder();
mPathBuilder->Close();
}
void
CanvasPath::MoveTo(double x, double y)
{
EnsurePathBuilder();
mPathBuilder->MoveTo(Point(ToFloat(x), ToFloat(y)));
}
void
CanvasPath::LineTo(double x, double y)
{
EnsurePathBuilder();
mPathBuilder->LineTo(Point(ToFloat(x), ToFloat(y)));
}
void
CanvasPath::QuadraticCurveTo(double cpx, double cpy, double x, double y)
{
EnsurePathBuilder();
mPathBuilder->QuadraticBezierTo(gfx::Point(ToFloat(cpx), ToFloat(cpy)),
gfx::Point(ToFloat(x), ToFloat(y)));
}
void
CanvasPath::BezierCurveTo(double cp1x, double cp1y,
double cp2x, double cp2y,
double x, double y)
{
BezierTo(gfx::Point(ToFloat(cp1x), ToFloat(cp1y)),
gfx::Point(ToFloat(cp2x), ToFloat(cp2y)),
gfx::Point(ToFloat(x), ToFloat(y)));
}
void
CanvasPath::ArcTo(double x1, double y1, double x2, double y2, double radius,
ErrorResult& error)
{
if (radius < 0) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
EnsurePathBuilder();
// Current point in user space!
Point p0 = mPathBuilder->CurrentPoint();
Point p1(x1, y1);
Point p2(x2, y2);
// Execute these calculations in double precision to avoid cumulative
// rounding errors.
double dir, a2, b2, c2, cosx, sinx, d, anx, any,
bnx, bny, x3, y3, x4, y4, cx, cy, angle0, angle1;
bool anticlockwise;
if (p0 == p1 || p1 == p2 || radius == 0) {
LineTo(p1.x, p1.y);
return;
}
// Check for colinearity
dir = (p2.x - p1.x) * (p0.y - p1.y) + (p2.y - p1.y) * (p1.x - p0.x);
if (dir == 0) {
LineTo(p1.x, p1.y);
return;
}
// XXX - Math for this code was already available from the non-azure code
// and would be well tested. Perhaps converting to bezier directly might
// be more efficient longer run.
a2 = (p0.x-x1)*(p0.x-x1) + (p0.y-y1)*(p0.y-y1);
b2 = (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2);
c2 = (p0.x-x2)*(p0.x-x2) + (p0.y-y2)*(p0.y-y2);
cosx = (a2+b2-c2)/(2*sqrt(a2*b2));
sinx = sqrt(1 - cosx*cosx);
d = radius / ((1 - cosx) / sinx);
anx = (x1-p0.x) / sqrt(a2);
any = (y1-p0.y) / sqrt(a2);
bnx = (x1-x2) / sqrt(b2);
bny = (y1-y2) / sqrt(b2);
x3 = x1 - anx*d;
y3 = y1 - any*d;
x4 = x1 - bnx*d;
y4 = y1 - bny*d;
anticlockwise = (dir < 0);
cx = x3 + any*radius*(anticlockwise ? 1 : -1);
cy = y3 - anx*radius*(anticlockwise ? 1 : -1);
angle0 = atan2((y3-cy), (x3-cx));
angle1 = atan2((y4-cy), (x4-cx));
LineTo(x3, y3);
Arc(cx, cy, radius, angle0, angle1, anticlockwise, error);
}
void
CanvasPath::Rect(double x, double y, double w, double h)
{
MoveTo(x, y);
LineTo(x + w, y);
LineTo(x + w, y + h);
LineTo(x, y + h);
ClosePath();
}
void
CanvasPath::Arc(double x, double y, double radius,
double startAngle, double endAngle, bool anticlockwise,
ErrorResult& error)
{
if (radius < 0.0) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
EnsurePathBuilder();
ArcToBezier(this, Point(x, y), Size(radius, radius), startAngle, endAngle, anticlockwise);
}
void
CanvasPath::LineTo(const gfx::Point& aPoint)
{
EnsurePathBuilder();
mPathBuilder->LineTo(aPoint);
}
void
CanvasPath::BezierTo(const gfx::Point& aCP1,
const gfx::Point& aCP2,
const gfx::Point& aCP3)
{
EnsurePathBuilder();
mPathBuilder->BezierTo(aCP1, aCP2, aCP3);
}
void
CanvasPath::AddPath(CanvasPath& aCanvasPath, const Optional<NonNull<SVGMatrix>>& aMatrix)
{
RefPtr<gfx::Path> tempPath = aCanvasPath.GetPath(CanvasWindingRule::Nonzero,
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
if (aMatrix.WasPassed()) {
const SVGMatrix& m = aMatrix.Value();
Matrix transform(m.A(), m.B(), m.C(), m.D(), m.E(), m.F());
if (!transform.IsIdentity()) {
RefPtr<PathBuilder> tempBuilder = tempPath->TransformedCopyToBuilder(transform, FillRule::FILL_WINDING);
tempPath = tempBuilder->Finish();
}
}
EnsurePathBuilder(); // in case a path is added to itself
tempPath->StreamToSink(mPathBuilder);
}
TemporaryRef<gfx::Path>
CanvasPath::GetPath(const CanvasWindingRule& winding, const DrawTarget* aTarget) const
{
FillRule fillRule = FillRule::FILL_WINDING;
if (winding == CanvasWindingRule::Evenodd) {
fillRule = FillRule::FILL_EVEN_ODD;
}
if (mPath &&
(mPath->GetBackendType() == aTarget->GetBackendType()) &&
(mPath->GetFillRule() == fillRule)) {
return mPath;
}
if (!mPath) {
// if there is no path, there must be a pathbuilder
MOZ_ASSERT(mPathBuilder);
mPath = mPathBuilder->Finish();
if (!mPath)
return mPath;
mPathBuilder = nullptr;
}
// retarget our backend if we're used with a different backend
if (mPath->GetBackendType() != aTarget->GetBackendType()) {
RefPtr<PathBuilder> tmpPathBuilder = aTarget->CreatePathBuilder(fillRule);
mPath->StreamToSink(tmpPathBuilder);
mPath = tmpPathBuilder->Finish();
} else if (mPath->GetFillRule() != fillRule) {
RefPtr<PathBuilder> tmpPathBuilder = mPath->CopyToBuilder(fillRule);
mPath = tmpPathBuilder->Finish();
}
return mPath;
}
void
CanvasPath::EnsurePathBuilder() const
{
if (mPathBuilder) {
return;
}
// if there is not pathbuilder, there must be a path
MOZ_ASSERT(mPath);
mPathBuilder = mPath->CopyToBuilder();
mPath = nullptr;
}
}
}
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