gecko-dev/layout/svg/nsFilterInstance.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/. */
// Main header first:
#include "nsFilterInstance.h"
// Keep others in (case-insensitive) order:
#include "gfxPlatform.h"
#include "gfxUtils.h"
#include "nsISVGChildFrame.h"
#include "nsRenderingContext.h"
#include "nsSVGFilterInstance.h"
#include "nsSVGFilterPaintCallback.h"
#include "nsSVGUtils.h"
#include "SVGContentUtils.h"
#include "FilterSupport.h"
#include "gfx2DGlue.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
nsresult
nsFilterInstance::PaintFilteredFrame(nsRenderingContext *aContext,
nsIFrame *aFilteredFrame,
nsSVGFilterPaintCallback *aPaintCallback,
const nsRect *aDirtyArea,
nsIFrame* aTransformRoot)
{
nsFilterInstance instance(aFilteredFrame, aPaintCallback, aDirtyArea,
nullptr, nullptr, nullptr,
aTransformRoot);
if (!instance.IsInitialized()) {
return NS_OK;
}
return instance.Render(aContext->ThebesContext());
}
nsRect
nsFilterInstance::GetPostFilterDirtyArea(nsIFrame *aFilteredFrame,
const nsRect& aPreFilterDirtyRect)
{
if (aPreFilterDirtyRect.IsEmpty()) {
return nsRect();
}
nsFilterInstance instance(aFilteredFrame, nullptr, nullptr,
&aPreFilterDirtyRect);
if (!instance.IsInitialized()) {
return nsRect();
}
// We've passed in the source's dirty area so the instance knows about it.
// Now we can ask the instance to compute the area of the filter output
// that's dirty.
nsRect dirtyRect;
nsresult rv = instance.ComputePostFilterDirtyRect(&dirtyRect);
if (NS_SUCCEEDED(rv)) {
return dirtyRect;
}
return nsRect();
}
nsRect
nsFilterInstance::GetPreFilterNeededArea(nsIFrame *aFilteredFrame,
const nsRect& aPostFilterDirtyRect)
{
nsFilterInstance instance(aFilteredFrame, nullptr, &aPostFilterDirtyRect);
if (!instance.IsInitialized()) {
return nsRect();
}
// Now we can ask the instance to compute the area of the source
// that's needed.
nsRect neededRect;
nsresult rv = instance.ComputeSourceNeededRect(&neededRect);
if (NS_SUCCEEDED(rv)) {
return neededRect;
}
return nsRect();
}
nsRect
nsFilterInstance::GetPostFilterBounds(nsIFrame *aFilteredFrame,
const gfxRect *aOverrideBBox,
const nsRect *aPreFilterBounds)
{
MOZ_ASSERT(!(aFilteredFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) ||
!(aFilteredFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
"Non-display SVG do not maintain visual overflow rects");
nsFilterInstance instance(aFilteredFrame, nullptr, nullptr,
aPreFilterBounds, aPreFilterBounds,
aOverrideBBox);
if (!instance.IsInitialized()) {
return nsRect();
}
nsRect bbox;
nsresult rv = instance.ComputePostFilterExtents(&bbox);
if (NS_SUCCEEDED(rv)) {
return bbox;
}
return nsRect();
}
nsFilterInstance::nsFilterInstance(nsIFrame *aTargetFrame,
nsSVGFilterPaintCallback *aPaintCallback,
const nsRect *aPostFilterDirtyRect,
const nsRect *aPreFilterDirtyRect,
const nsRect *aPreFilterVisualOverflowRectOverride,
const gfxRect *aOverrideBBox,
nsIFrame* aTransformRoot) :
mTargetFrame(aTargetFrame),
mPaintCallback(aPaintCallback),
mTransformRoot(aTransformRoot),
mInitialized(false) {
mTargetBBox = aOverrideBBox ?
*aOverrideBBox : nsSVGUtils::GetBBox(mTargetFrame);
nsresult rv = BuildPrimitives();
if (NS_FAILED(rv)) {
return;
}
if (mPrimitiveDescriptions.IsEmpty()) {
// Nothing should be rendered.
return;
}
// Get various transforms:
gfxMatrix filterToUserSpace(mFilterRegion.Width() / mFilterSpaceBounds.width, 0.0f,
0.0f, mFilterRegion.Height() / mFilterSpaceBounds.height,
mFilterRegion.X(), mFilterRegion.Y());
// Only used (so only set) when we paint:
if (mPaintCallback) {
mFilterSpaceToDeviceSpaceTransform = filterToUserSpace *
nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING);
}
// Convert the passed in rects from frame to filter space:
mAppUnitsPerCSSPx = mTargetFrame->PresContext()->AppUnitsPerCSSPixel();
mFilterSpaceToFrameSpaceInCSSPxTransform =
filterToUserSpace * GetUserSpaceToFrameSpaceInCSSPxTransform();
// mFilterSpaceToFrameSpaceInCSSPxTransform is always invertible
mFrameSpaceInCSSPxToFilterSpaceTransform =
mFilterSpaceToFrameSpaceInCSSPxTransform;
mFrameSpaceInCSSPxToFilterSpaceTransform.Invert();
mPostFilterDirtyRect = FrameSpaceToFilterSpace(aPostFilterDirtyRect);
mPreFilterDirtyRect = FrameSpaceToFilterSpace(aPreFilterDirtyRect);
if (aPreFilterVisualOverflowRectOverride) {
mTargetBounds =
FrameSpaceToFilterSpace(aPreFilterVisualOverflowRectOverride);
} else {
nsRect preFilterVOR = mTargetFrame->GetPreEffectsVisualOverflowRect();
mTargetBounds = FrameSpaceToFilterSpace(&preFilterVOR);
}
mInitialized = true;
}
gfxRect
nsFilterInstance::UserSpaceToFilterSpace(const gfxRect& aRect) const
{
gfxRect r = aRect - mFilterRegion.TopLeft();
r.Scale(mFilterSpaceBounds.width / mFilterRegion.Width(),
mFilterSpaceBounds.height / mFilterRegion.Height());
return r;
}
gfxMatrix
nsFilterInstance::GetUserSpaceToFilterSpaceTransform() const
{
gfxFloat widthScale = mFilterSpaceBounds.width / mFilterRegion.Width();
gfxFloat heightScale = mFilterSpaceBounds.height / mFilterRegion.Height();
return gfxMatrix(widthScale, 0.0f,
0.0f, heightScale,
-mFilterRegion.X() * widthScale, -mFilterRegion.Y() * heightScale);
}
nsresult
nsFilterInstance::BuildPrimitives()
{
NS_ASSERTION(!mPrimitiveDescriptions.Length(),
"expected to start building primitives from scratch");
const nsTArray<nsStyleFilter>& filters = mTargetFrame->StyleSVGReset()->mFilters;
for (uint32_t i = 0; i < filters.Length(); i++) {
nsresult rv = BuildPrimitivesForFilter(filters[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
nsresult
nsFilterInstance::BuildPrimitivesForFilter(const nsStyleFilter& aFilter)
{
if (aFilter.GetType() == NS_STYLE_FILTER_URL) {
// Build primitives for an SVG filter.
nsSVGFilterInstance svgFilterInstance(aFilter, mTargetFrame, mTargetBBox);
if (!svgFilterInstance.IsInitialized()) {
return NS_ERROR_FAILURE;
}
// For now, we use the last SVG filter region as the overall filter region
// for the filter chain. Eventually, we will compute the overall filter
// using all of the generated FilterPrimitiveDescriptions.
mFilterRegion = svgFilterInstance.GetFilterRegion();
mFilterSpaceBounds = svgFilterInstance.GetFilterSpaceBounds();
// If this overflows, we can at least paint the maximum surface size.
bool overflow;
gfxIntSize surfaceSize =
nsSVGUtils::ConvertToSurfaceSize(mFilterSpaceBounds.Size(), &overflow);
mFilterSpaceBounds.SizeTo(surfaceSize);
return svgFilterInstance.BuildPrimitives(mPrimitiveDescriptions, mInputImages);
}
// Eventually, we will build primitives for CSS filters, too.
return NS_ERROR_FAILURE;
}
void
nsFilterInstance::ComputeNeededBoxes()
{
if (mPrimitiveDescriptions.IsEmpty())
return;
nsIntRegion sourceGraphicNeededRegion;
nsIntRegion fillPaintNeededRegion;
nsIntRegion strokePaintNeededRegion;
FilterDescription filter(mPrimitiveDescriptions, ToIntRect(mFilterSpaceBounds));
FilterSupport::ComputeSourceNeededRegions(
filter, mPostFilterDirtyRect,
sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
nsIntRect sourceBoundsInt;
gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
sourceBounds.RoundOut();
// Detect possible float->int overflow
if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
return;
sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
sourceGraphicNeededRegion.And(sourceGraphicNeededRegion, sourceBoundsInt);
mSourceGraphic.mNeededBounds = sourceGraphicNeededRegion.GetBounds();
mFillPaint.mNeededBounds = fillPaintNeededRegion.GetBounds();
mStrokePaint.mNeededBounds = strokePaintNeededRegion.GetBounds();
}
nsresult
nsFilterInstance::BuildSourcePaint(SourceInfo *aSource,
gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsIntRect neededRect = aSource->mNeededBounds;
RefPtr<DrawTarget> offscreenDT;
nsRefPtr<gfxASurface> offscreenSurface;
nsRefPtr<gfxContext> ctx;
if (aTargetSurface) {
offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
neededRect.Size().ToIntSize(), gfxContentType::COLOR_ALPHA);
if (!offscreenSurface || offscreenSurface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenSurface);
} else {
offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenDT);
}
ctx->Translate(-neededRect.TopLeft());
nsRenderingContext tmpCtx;
tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
m.Invert();
gfxRect r = m.TransformBounds(mFilterSpaceBounds);
gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
gfxContext *gfx = tmpCtx.ThebesContext();
gfx->Multiply(deviceToFilterSpace);
gfx->Save();
gfxMatrix matrix =
nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING,
mTransformRoot);
if (!matrix.IsSingular()) {
gfx->Multiply(matrix);
gfx->Rectangle(r);
if ((aSource == &mFillPaint &&
nsSVGUtils::SetupCairoFillPaint(mTargetFrame, gfx)) ||
(aSource == &mStrokePaint &&
nsSVGUtils::SetupCairoStrokePaint(mTargetFrame, gfx))) {
gfx->Fill();
}
}
gfx->Restore();
if (offscreenSurface) {
aSource->mSourceSurface =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
} else {
aSource->mSourceSurface = offscreenDT->Snapshot();
}
aSource->mSurfaceRect = ToIntRect(neededRect);
return NS_OK;
}
nsresult
nsFilterInstance::BuildSourcePaints(gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsresult rv = NS_OK;
if (!mFillPaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mFillPaint, aTargetSurface, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!mStrokePaint.mNeededBounds.IsEmpty()) {
rv = BuildSourcePaint(&mStrokePaint, aTargetSurface, aTargetDT);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
nsresult
nsFilterInstance::BuildSourceImage(gfxASurface* aTargetSurface,
DrawTarget* aTargetDT)
{
nsIntRect neededRect = mSourceGraphic.mNeededBounds;
if (neededRect.IsEmpty()) {
return NS_OK;
}
RefPtr<DrawTarget> offscreenDT;
nsRefPtr<gfxASurface> offscreenSurface;
nsRefPtr<gfxContext> ctx;
if (aTargetSurface) {
offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
neededRect.Size().ToIntSize(), gfxContentType::COLOR_ALPHA);
if (!offscreenSurface || offscreenSurface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenSurface);
} else {
offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
if (!offscreenDT) {
return NS_ERROR_OUT_OF_MEMORY;
}
ctx = new gfxContext(offscreenDT);
}
ctx->Translate(-neededRect.TopLeft());
nsRenderingContext tmpCtx;
tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
m.Invert();
gfxRect r = m.TransformBounds(neededRect);
r.RoundOut();
nsIntRect dirty;
if (!gfxUtils::GfxRectToIntRect(r, &dirty))
return NS_ERROR_FAILURE;
// SVG graphics paint to device space, so we need to set an initial device
// space to filter space transform on the gfxContext that SourceGraphic
// and SourceAlpha will paint to.
//
// (In theory it would be better to minimize error by having filtered SVG
// graphics temporarily paint to user space when painting the sources and
// only set a user space to filter space transform on the gfxContext
// (since that would eliminate the transform multiplications from user
// space to device space and back again). However, that would make the
// code more complex while being hard to get right without introducing
// subtle bugs, and in practice it probably makes no real difference.)
gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
tmpCtx.ThebesContext()->Multiply(deviceToFilterSpace);
mPaintCallback->Paint(&tmpCtx, mTargetFrame, &dirty, mTransformRoot);
RefPtr<SourceSurface> sourceGraphicSource;
if (offscreenSurface) {
sourceGraphicSource =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
} else {
sourceGraphicSource = offscreenDT->Snapshot();
}
mSourceGraphic.mSourceSurface = sourceGraphicSource;
mSourceGraphic.mSurfaceRect = ToIntRect(neededRect);
return NS_OK;
}
nsresult
nsFilterInstance::Render(gfxContext* aContext)
{
nsIntRect filterRect = mPostFilterDirtyRect.Intersect(mFilterSpaceBounds);
gfxMatrix ctm = GetFilterSpaceToDeviceSpaceTransform();
if (filterRect.IsEmpty() || ctm.IsSingular()) {
return NS_OK;
}
Matrix oldDTMatrix;
nsRefPtr<gfxASurface> resultImage;
RefPtr<DrawTarget> dt;
if (aContext->IsCairo()) {
resultImage =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(filterRect.Size().ToIntSize(),
gfxContentType::COLOR_ALPHA);
if (!resultImage || resultImage->CairoStatus())
return NS_ERROR_OUT_OF_MEMORY;
// Create a Cairo DrawTarget around resultImage.
dt = gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(
resultImage, ToIntSize(filterRect.Size()));
} else {
// When we have a DrawTarget-backed context, we can call DrawFilter
// directly on the target DrawTarget and don't need a temporary DT.
dt = aContext->GetDrawTarget();
oldDTMatrix = dt->GetTransform();
Matrix matrix = ToMatrix(ctm);
matrix.Translate(filterRect.x, filterRect.y);
dt->SetTransform(matrix * oldDTMatrix);
}
ComputeNeededBoxes();
nsresult rv = BuildSourceImage(resultImage, dt);
if (NS_FAILED(rv))
return rv;
rv = BuildSourcePaints(resultImage, dt);
if (NS_FAILED(rv))
return rv;
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
FilterSupport::RenderFilterDescription(
dt, filter, ToRect(filterRect),
mSourceGraphic.mSourceSurface, mSourceGraphic.mSurfaceRect,
mFillPaint.mSourceSurface, mFillPaint.mSurfaceRect,
mStrokePaint.mSourceSurface, mStrokePaint.mSurfaceRect,
mInputImages);
if (resultImage) {
aContext->Save();
aContext->Multiply(ctm);
aContext->Translate(filterRect.TopLeft());
aContext->SetSource(resultImage);
aContext->Paint();
aContext->Restore();
} else {
dt->SetTransform(oldDTMatrix);
}
return NS_OK;
}
nsresult
nsFilterInstance::ComputePostFilterDirtyRect(nsRect* aPostFilterDirtyRect)
{
*aPostFilterDirtyRect = nsRect();
if (mPreFilterDirtyRect.IsEmpty()) {
return NS_OK;
}
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
nsIntRegion resultChangeRegion =
FilterSupport::ComputeResultChangeRegion(filter,
mPreFilterDirtyRect, nsIntRegion(), nsIntRegion());
*aPostFilterDirtyRect =
FilterSpaceToFrameSpace(resultChangeRegion.GetBounds());
return NS_OK;
}
nsresult
nsFilterInstance::ComputePostFilterExtents(nsRect* aPostFilterExtents)
{
*aPostFilterExtents = nsRect();
nsIntRect sourceBoundsInt;
gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
sourceBounds.RoundOut();
// Detect possible float->int overflow
if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
return NS_ERROR_FAILURE;
sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
nsIntRegion postFilterExtents =
FilterSupport::ComputePostFilterExtents(filter, sourceBoundsInt);
*aPostFilterExtents = FilterSpaceToFrameSpace(postFilterExtents.GetBounds());
return NS_OK;
}
nsresult
nsFilterInstance::ComputeSourceNeededRect(nsRect* aDirty)
{
ComputeNeededBoxes();
*aDirty = FilterSpaceToFrameSpace(mSourceGraphic.mNeededBounds);
return NS_OK;
}
nsIntRect
nsFilterInstance::FrameSpaceToFilterSpace(const nsRect* aRect) const
{
nsIntRect rect = mFilterSpaceBounds;
if (aRect) {
if (aRect->IsEmpty()) {
return nsIntRect();
}
gfxRect rectInCSSPx =
nsLayoutUtils::RectToGfxRect(*aRect, mAppUnitsPerCSSPx);
gfxRect rectInFilterSpace =
mFrameSpaceInCSSPxToFilterSpaceTransform.TransformBounds(rectInCSSPx);
rectInFilterSpace.RoundOut();
nsIntRect intRect;
if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
rect = intRect;
}
}
return rect;
}
nsRect
nsFilterInstance::FilterSpaceToFrameSpace(const nsIntRect& aRect) const
{
if (aRect.IsEmpty()) {
return nsRect();
}
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
r = mFilterSpaceToFrameSpaceInCSSPxTransform.TransformBounds(r);
return nsLayoutUtils::RoundGfxRectToAppRect(r, mAppUnitsPerCSSPx);
}
gfxMatrix
nsFilterInstance::GetUserSpaceToFrameSpaceInCSSPxTransform() const
{
gfxMatrix userToFrameSpaceInCSSPx;
if ((mTargetFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
// As currently implemented by Mozilla for the purposes of filters, user
// space is the coordinate system established by GetCanvasTM(), since
// that's what we use to set filterToDeviceSpace above. In other words,
// for SVG, user space is actually the coordinate system aTarget
// establishes for _its_ children (i.e. after taking account of any x/y
// and viewBox attributes), not the coordinate system that is established
// for it by its 'transform' attribute (or by its _parent_) as it's
// normally defined. (XXX We should think about fixing this.) The only
// frame type for which these extra transforms are not simply an x/y
// translation is nsSVGInnerSVGFrame, hence we treat it specially here.
if (mTargetFrame->GetType() == nsGkAtoms::svgInnerSVGFrame) {
userToFrameSpaceInCSSPx =
static_cast<nsSVGElement*>(mTargetFrame->GetContent())->
PrependLocalTransformsTo(gfxMatrix());
} else {
gfxPoint targetsUserSpaceOffset =
nsLayoutUtils::RectToGfxRect(mTargetFrame->GetRect(),
mAppUnitsPerCSSPx).TopLeft();
userToFrameSpaceInCSSPx.Translate(-targetsUserSpaceOffset);
}
}
// else, for all other frames, leave as the identity matrix
return userToFrameSpaceInCSSPx;
}