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gecko-dev
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gecko-dev/layout/svg/nsSVGUtils.cpp

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59 KiB
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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:
// This is also necessary to ensure our definition of M_SQRT1_2 is picked up
#include "nsSVGUtils.h"
#include <algorithm>
// Keep others in (case-insensitive) order:
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "gfxMatrix.h"
#include "gfxPlatform.h"
#include "gfxRect.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Preferences.h"
#include "nsCSSFrameConstructor.h"
#include "nsDisplayList.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsINameSpaceManager.h"
#include "nsIPresShell.h"
#include "nsISVGChildFrame.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsStyleCoord.h"
#include "nsStyleStruct.h"
#include "nsSVGClipPathFrame.h"
#include "nsSVGContainerFrame.h"
#include "nsSVGEffects.h"
#include "nsSVGFilterFrame.h"
#include "nsSVGFilterPaintCallback.h"
#include "nsSVGForeignObjectFrame.h"
#include "nsSVGGeometryFrame.h"
#include "nsSVGGlyphFrame.h"
#include "nsSVGInnerSVGFrame.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGLength2.h"
#include "nsSVGMaskFrame.h"
#include "nsSVGOuterSVGFrame.h"
#include "mozilla/dom/SVGPathElement.h"
#include "nsSVGPathGeometryElement.h"
#include "nsSVGPathGeometryFrame.h"
#include "nsSVGPaintServerFrame.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "nsSVGTextContainerFrame.h"
#include "nsTextFrame.h"
#include "SVGContentUtils.h"
#include "mozilla/unused.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
// c = n / 255
// (c <= 0.0031308 ? c * 12.92 : 1.055 * pow(c, 1 / 2.4) - 0.055) * 255 + 0.5
static const uint8_t glinearRGBTosRGBMap[256] = {
0, 13, 22, 28, 34, 38, 42, 46,
50, 53, 56, 59, 61, 64, 66, 69,
71, 73, 75, 77, 79, 81, 83, 85,
86, 88, 90, 92, 93, 95, 96, 98,
99, 101, 102, 104, 105, 106, 108, 109,
110, 112, 113, 114, 115, 117, 118, 119,
120, 121, 122, 124, 125, 126, 127, 128,
129, 130, 131, 132, 133, 134, 135, 136,
137, 138, 139, 140, 141, 142, 143, 144,
145, 146, 147, 148, 148, 149, 150, 151,
152, 153, 154, 155, 155, 156, 157, 158,
159, 159, 160, 161, 162, 163, 163, 164,
165, 166, 167, 167, 168, 169, 170, 170,
171, 172, 173, 173, 174, 175, 175, 176,
177, 178, 178, 179, 180, 180, 181, 182,
182, 183, 184, 185, 185, 186, 187, 187,
188, 189, 189, 190, 190, 191, 192, 192,
193, 194, 194, 195, 196, 196, 197, 197,
198, 199, 199, 200, 200, 201, 202, 202,
203, 203, 204, 205, 205, 206, 206, 207,
208, 208, 209, 209, 210, 210, 211, 212,
212, 213, 213, 214, 214, 215, 215, 216,
216, 217, 218, 218, 219, 219, 220, 220,
221, 221, 222, 222, 223, 223, 224, 224,
225, 226, 226, 227, 227, 228, 228, 229,
229, 230, 230, 231, 231, 232, 232, 233,
233, 234, 234, 235, 235, 236, 236, 237,
237, 238, 238, 238, 239, 239, 240, 240,
241, 241, 242, 242, 243, 243, 244, 244,
245, 245, 246, 246, 246, 247, 247, 248,
248, 249, 249, 250, 250, 251, 251, 251,
252, 252, 253, 253, 254, 254, 255, 255
};
// c = n / 255
// c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5
static const uint8_t gsRGBToLinearRGBMap[256] = {
0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7,
8, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 12, 12, 12, 13,
13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 17, 18, 18, 19, 19, 20,
20, 21, 22, 22, 23, 23, 24, 24,
25, 25, 26, 27, 27, 28, 29, 29,
30, 30, 31, 32, 32, 33, 34, 35,
35, 36, 37, 37, 38, 39, 40, 41,
41, 42, 43, 44, 45, 45, 46, 47,
48, 49, 50, 51, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62,
63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 76, 77, 78, 79,
80, 81, 82, 84, 85, 86, 87, 88,
90, 91, 92, 93, 95, 96, 97, 99,
100, 101, 103, 104, 105, 107, 108, 109,
111, 112, 114, 115, 116, 118, 119, 121,
122, 124, 125, 127, 128, 130, 131, 133,
134, 136, 138, 139, 141, 142, 144, 146,
147, 149, 151, 152, 154, 156, 157, 159,
161, 163, 164, 166, 168, 170, 171, 173,
175, 177, 179, 181, 183, 184, 186, 188,
190, 192, 194, 196, 198, 200, 202, 204,
206, 208, 210, 212, 214, 216, 218, 220,
222, 224, 226, 229, 231, 233, 235, 237,
239, 242, 244, 246, 248, 250, 253, 255
};
static bool sSVGDisplayListHitTestingEnabled;
static bool sSVGDisplayListPaintingEnabled;
static bool sSVGTextCSSFramesEnabled;
bool
NS_SVGDisplayListHitTestingEnabled()
{
return sSVGDisplayListHitTestingEnabled;
}
bool
NS_SVGDisplayListPaintingEnabled()
{
return sSVGDisplayListPaintingEnabled;
}
bool
NS_SVGTextCSSFramesEnabled()
{
return sSVGTextCSSFramesEnabled;
}
// we only take the address of this:
static mozilla::gfx::UserDataKey sSVGAutoRenderStateKey;
SVGAutoRenderState::SVGAutoRenderState(nsRenderingContext *aContext,
RenderMode aMode)
: mContext(aContext)
, mOriginalRenderState(nullptr)
, mMode(aMode)
, mPaintingToWindow(false)
{
mOriginalRenderState = aContext->RemoveUserData(&sSVGAutoRenderStateKey);
// We always remove ourselves from aContext before it dies, so
// passing nullptr as the destroy function is okay.
aContext->AddUserData(&sSVGAutoRenderStateKey, this, nullptr);
}
SVGAutoRenderState::~SVGAutoRenderState()
{
mContext->RemoveUserData(&sSVGAutoRenderStateKey);
if (mOriginalRenderState) {
mContext->AddUserData(&sSVGAutoRenderStateKey, mOriginalRenderState, nullptr);
}
}
void
SVGAutoRenderState::SetPaintingToWindow(bool aPaintingToWindow)
{
mPaintingToWindow = aPaintingToWindow;
}
/* static */ SVGAutoRenderState::RenderMode
SVGAutoRenderState::GetRenderMode(nsRenderingContext *aContext)
{
void *state = aContext->GetUserData(&sSVGAutoRenderStateKey);
if (state) {
return static_cast<SVGAutoRenderState*>(state)->mMode;
}
return NORMAL;
}
/* static */ bool
SVGAutoRenderState::IsPaintingToWindow(nsRenderingContext *aContext)
{
void *state = aContext->GetUserData(&sSVGAutoRenderStateKey);
if (state) {
return static_cast<SVGAutoRenderState*>(state)->mPaintingToWindow;
}
return false;
}
void
nsSVGUtils::Init()
{
Preferences::AddBoolVarCache(&sSVGDisplayListHitTestingEnabled,
"svg.display-lists.hit-testing.enabled");
Preferences::AddBoolVarCache(&sSVGDisplayListPaintingEnabled,
"svg.display-lists.painting.enabled");
Preferences::AddBoolVarCache(&sSVGTextCSSFramesEnabled,
"svg.text.css-frames.enabled");
}
void
nsSVGUtils::UnPremultiplyImageDataAlpha(uint8_t *data,
int32_t stride,
const nsIntRect &rect)
{
for (int32_t y = rect.y; y < rect.YMost(); y++) {
for (int32_t x = rect.x; x < rect.XMost(); x++) {
uint8_t *pixel = data + stride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
if (a == 255)
continue;
if (a) {
pixel[GFX_ARGB32_OFFSET_B] = (255 * pixel[GFX_ARGB32_OFFSET_B]) / a;
pixel[GFX_ARGB32_OFFSET_G] = (255 * pixel[GFX_ARGB32_OFFSET_G]) / a;
pixel[GFX_ARGB32_OFFSET_R] = (255 * pixel[GFX_ARGB32_OFFSET_R]) / a;
} else {
pixel[GFX_ARGB32_OFFSET_B] = 0;
pixel[GFX_ARGB32_OFFSET_G] = 0;
pixel[GFX_ARGB32_OFFSET_R] = 0;
}
}
}
}
void
nsSVGUtils::PremultiplyImageDataAlpha(uint8_t *data,
int32_t stride,
const nsIntRect &rect)
{
for (int32_t y = rect.y; y < rect.YMost(); y++) {
for (int32_t x = rect.x; x < rect.XMost(); x++) {
uint8_t *pixel = data + stride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
if (a == 255)
continue;
FAST_DIVIDE_BY_255(pixel[GFX_ARGB32_OFFSET_B],
pixel[GFX_ARGB32_OFFSET_B] * a);
FAST_DIVIDE_BY_255(pixel[GFX_ARGB32_OFFSET_G],
pixel[GFX_ARGB32_OFFSET_G] * a);
FAST_DIVIDE_BY_255(pixel[GFX_ARGB32_OFFSET_R],
pixel[GFX_ARGB32_OFFSET_R] * a);
}
}
}
void
nsSVGUtils::ConvertImageDataToLinearRGB(uint8_t *data,
int32_t stride,
const nsIntRect &rect)
{
for (int32_t y = rect.y; y < rect.YMost(); y++) {
for (int32_t x = rect.x; x < rect.XMost(); x++) {
uint8_t *pixel = data + stride * y + 4 * x;
pixel[GFX_ARGB32_OFFSET_B] =
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]];
pixel[GFX_ARGB32_OFFSET_G] =
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]];
pixel[GFX_ARGB32_OFFSET_R] =
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]];
}
}
}
void
nsSVGUtils::ConvertImageDataFromLinearRGB(uint8_t *data,
int32_t stride,
const nsIntRect &rect)
{
for (int32_t y = rect.y; y < rect.YMost(); y++) {
for (int32_t x = rect.x; x < rect.XMost(); x++) {
uint8_t *pixel = data + stride * y + 4 * x;
pixel[GFX_ARGB32_OFFSET_B] =
glinearRGBTosRGBMap[pixel[GFX_ARGB32_OFFSET_B]];
pixel[GFX_ARGB32_OFFSET_G] =
glinearRGBTosRGBMap[pixel[GFX_ARGB32_OFFSET_G]];
pixel[GFX_ARGB32_OFFSET_R] =
glinearRGBTosRGBMap[pixel[GFX_ARGB32_OFFSET_R]];
}
}
}
void
nsSVGUtils::ComputesRGBLuminanceMask(uint8_t *aData,
int32_t aStride,
const nsIntRect &aRect,
float aOpacity)
{
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
uint8_t luminance;
if (a) {
/* sRGB -> intensity (unpremultiply cancels out the
* (a/255.0) multiplication with aOpacity */
luminance =
static_cast<uint8_t>
((pixel[GFX_ARGB32_OFFSET_R] * 0.2125 +
pixel[GFX_ARGB32_OFFSET_G] * 0.7154 +
pixel[GFX_ARGB32_OFFSET_B] * 0.0721) *
aOpacity);
} else {
luminance = 0;
}
memset(pixel, luminance, 4);
}
}
}
void
nsSVGUtils::ComputeLinearRGBLuminanceMask(uint8_t *aData,
int32_t aStride,
const nsIntRect &aRect,
float aOpacity)
{
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
uint8_t luminance;
// unpremultiply
if (a) {
if (a != 255) {
pixel[GFX_ARGB32_OFFSET_B] =
(255 * pixel[GFX_ARGB32_OFFSET_B]) / a;
pixel[GFX_ARGB32_OFFSET_G] =
(255 * pixel[GFX_ARGB32_OFFSET_G]) / a;
pixel[GFX_ARGB32_OFFSET_R] =
(255 * pixel[GFX_ARGB32_OFFSET_R]) / a;
}
/* sRGB -> linearRGB -> intensity */
luminance =
static_cast<uint8_t>
((gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]] *
0.2125 +
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]] *
0.7154 +
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]] *
0.0721) * (a / 255.0) * aOpacity);
} else {
luminance = 0;
}
memset(pixel, luminance, 4);
}
}
}
void
nsSVGUtils::ComputeAlphaMask(uint8_t *aData,
int32_t aStride,
const nsIntRect &aRect,
float aOpacity)
{
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t luminance = pixel[GFX_ARGB32_OFFSET_A] * aOpacity;
memset(pixel, luminance, 4);
}
}
}
float
nsSVGUtils::CoordToFloat(nsPresContext *aPresContext,
nsSVGElement *aContent,
const nsStyleCoord &aCoord)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Factor:
// user units
return aCoord.GetFactorValue();
case eStyleUnit_Coord:
return nsPresContext::AppUnitsToFloatCSSPixels(aCoord.GetCoordValue());
case eStyleUnit_Percent: {
SVGSVGElement* ctx = aContent->GetCtx();
return ctx ? aCoord.GetPercentValue() * ctx->GetLength(SVGContentUtils::XY) : 0.0f;
}
default:
return 0.0f;
}
}
nsSVGDisplayContainerFrame*
nsSVGUtils::GetNearestSVGViewport(nsIFrame *aFrame)
{
NS_ASSERTION(aFrame->IsFrameOfType(nsIFrame::eSVG), "SVG frame expected");
if (aFrame->GetType() == nsGkAtoms::svgOuterSVGFrame) {
return nullptr;
}
while ((aFrame = aFrame->GetParent())) {
NS_ASSERTION(aFrame->IsFrameOfType(nsIFrame::eSVG), "SVG frame expected");
if (aFrame->GetType() == nsGkAtoms::svgInnerSVGFrame ||
aFrame->GetType() == nsGkAtoms::svgOuterSVGFrame) {
return do_QueryFrame(aFrame);
}
}
NS_NOTREACHED("This is not reached. It's only needed to compile.");
return nullptr;
}
nsRect
nsSVGUtils::GetPostFilterVisualOverflowRect(nsIFrame *aFrame,
const nsRect &aPreFilterRect)
{
NS_ABORT_IF_FALSE(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT,
"Called on invalid frame type");
nsSVGFilterFrame *filter = nsSVGEffects::GetFilterFrame(aFrame);
if (!filter) {
return aPreFilterRect;
}
return filter->GetPostFilterBounds(aFrame, nullptr, &aPreFilterRect);
}
bool
nsSVGUtils::OuterSVGIsCallingReflowSVG(nsIFrame *aFrame)
{
return GetOuterSVGFrame(aFrame)->IsCallingReflowSVG();
}
bool
nsSVGUtils::AnyOuterSVGIsCallingReflowSVG(nsIFrame* aFrame)
{
nsSVGOuterSVGFrame* outer = GetOuterSVGFrame(aFrame);
do {
if (outer->IsCallingReflowSVG()) {
return true;
}
outer = GetOuterSVGFrame(outer->GetParent());
} while (outer);
return false;
}
void
nsSVGUtils::ScheduleReflowSVG(nsIFrame *aFrame)
{
NS_ABORT_IF_FALSE(aFrame->IsFrameOfType(nsIFrame::eSVG),
"Passed bad frame!");
// If this is triggered, the callers should be fixed to call us before
// ReflowSVG is called. If we try to mark dirty bits on frames while we're
// in the process of removing them, things will get messed up.
NS_ASSERTION(!OuterSVGIsCallingReflowSVG(aFrame),
"Do not call under nsISVGChildFrame::ReflowSVG!");
// We don't call nsSVGEffects::InvalidateRenderingObservers here because
// we should only be called under InvalidateAndScheduleReflowSVG (which
// calls InvalidateBounds) or nsSVGDisplayContainerFrame::InsertFrames
// (at which point the frame has no observers).
if (aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
return;
}
if (aFrame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_FIRST_REFLOW)) {
// Nothing to do if we're already dirty, or if the outer-<svg>
// hasn't yet had its initial reflow.
return;
}
nsSVGOuterSVGFrame *outerSVGFrame = nullptr;
// We must not add dirty bits to the nsSVGOuterSVGFrame or else
// PresShell::FrameNeedsReflow won't work when we pass it in below.
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG) {
outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(aFrame);
} else {
aFrame->AddStateBits(NS_FRAME_IS_DIRTY);
nsIFrame *f = aFrame->GetParent();
while (f && !(f->GetStateBits() & NS_STATE_IS_OUTER_SVG)) {
if (f->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) {
return;
}
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
f = f->GetParent();
NS_ABORT_IF_FALSE(f->IsFrameOfType(nsIFrame::eSVG),
"NS_STATE_IS_OUTER_SVG check above not valid!");
}
outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(f);
NS_ABORT_IF_FALSE(outerSVGFrame &&
outerSVGFrame->GetType() == nsGkAtoms::svgOuterSVGFrame,
"Did not find nsSVGOuterSVGFrame!");
}
if (outerSVGFrame->GetStateBits() & NS_FRAME_IN_REFLOW) {
// We're currently under an nsSVGOuterSVGFrame::Reflow call so there is no
// need to call PresShell::FrameNeedsReflow, since we have an
// nsSVGOuterSVGFrame::DidReflow call pending.
return;
}
nsFrameState dirtyBit =
(outerSVGFrame == aFrame ? NS_FRAME_IS_DIRTY : NS_FRAME_HAS_DIRTY_CHILDREN);
aFrame->PresContext()->PresShell()->FrameNeedsReflow(
outerSVGFrame, nsIPresShell::eResize, dirtyBit);
}
bool
nsSVGUtils::NeedsReflowSVG(nsIFrame *aFrame)
{
NS_ABORT_IF_FALSE(aFrame->IsFrameOfType(nsIFrame::eSVG),
"SVG uses bits differently!");
// The flags we test here may change, hence why we have this separate
// function.
return NS_SUBTREE_DIRTY(aFrame);
}
void
nsSVGUtils::NotifyAncestorsOfFilterRegionChange(nsIFrame *aFrame)
{
NS_ABORT_IF_FALSE(!(aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG),
"Not expecting to be called on the outer SVG Frame");
aFrame = aFrame->GetParent();
while (aFrame) {
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG)
return;
nsSVGFilterProperty *property = nsSVGEffects::GetFilterProperty(aFrame);
if (property) {
property->Invalidate();
}
aFrame = aFrame->GetParent();
}
}
float
nsSVGUtils::ObjectSpace(const gfxRect &aRect, const nsSVGLength2 *aLength)
{
float axis;
switch (aLength->GetCtxType()) {
case SVGContentUtils::X:
axis = aRect.Width();
break;
case SVGContentUtils::Y:
axis = aRect.Height();
break;
case SVGContentUtils::XY:
axis = float(SVGContentUtils::ComputeNormalizedHypotenuse(
aRect.Width(), aRect.Height()));
break;
default:
NS_NOTREACHED("unexpected ctx type");
axis = 0.0f;
break;
}
if (aLength->IsPercentage()) {
// Multiply first to avoid precision errors:
return axis * aLength->GetAnimValInSpecifiedUnits() / 100;
}
return aLength->GetAnimValue(static_cast<SVGSVGElement*>(nullptr)) * axis;
}
float
nsSVGUtils::UserSpace(nsSVGElement *aSVGElement, const nsSVGLength2 *aLength)
{
return aLength->GetAnimValue(aSVGElement);
}
float
nsSVGUtils::UserSpace(nsIFrame *aNonSVGContext, const nsSVGLength2 *aLength)
{
return aLength->GetAnimValue(aNonSVGContext);
}
nsSVGOuterSVGFrame *
nsSVGUtils::GetOuterSVGFrame(nsIFrame *aFrame)
{
while (aFrame) {
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG) {
return static_cast<nsSVGOuterSVGFrame*>(aFrame);
}
aFrame = aFrame->GetParent();
}
return nullptr;
}
nsIFrame*
nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(nsIFrame* aFrame, nsRect* aRect)
{
nsISVGChildFrame* svg = do_QueryFrame(aFrame);
if (!svg)
return nullptr;
*aRect = (aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) ?
nsRect(0, 0, 0, 0) : svg->GetCoveredRegion();
return GetOuterSVGFrame(aFrame);
}
gfxMatrix
nsSVGUtils::GetCanvasTM(nsIFrame *aFrame, uint32_t aFor)
{
// XXX yuck, we really need a common interface for GetCanvasTM
if (!aFrame->IsFrameOfType(nsIFrame::eSVG)) {
return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(aFrame);
}
if (!(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
if ((aFor == nsISVGChildFrame::FOR_PAINTING &&
NS_SVGDisplayListPaintingEnabled()) ||
(aFor == nsISVGChildFrame::FOR_HIT_TESTING &&
NS_SVGDisplayListHitTestingEnabled())) {
return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(aFrame);
}
}
nsIAtom* type = aFrame->GetType();
if (type == nsGkAtoms::svgForeignObjectFrame) {
return static_cast<nsSVGForeignObjectFrame*>(aFrame)->GetCanvasTM(aFor);
}
if (type == nsGkAtoms::svgOuterSVGFrame) {
return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(aFrame);
}
nsSVGContainerFrame *containerFrame = do_QueryFrame(aFrame);
if (containerFrame) {
return containerFrame->GetCanvasTM(aFor);
}
return static_cast<nsSVGGeometryFrame*>(aFrame)->GetCanvasTM(aFor);
}
gfxMatrix
nsSVGUtils::GetUserToCanvasTM(nsIFrame *aFrame, uint32_t aFor)
{
NS_ASSERTION(aFor == nsISVGChildFrame::FOR_OUTERSVG_TM,
"Unexpected aFor?");
nsISVGChildFrame* svgFrame = do_QueryFrame(aFrame);
NS_ASSERTION(svgFrame, "bad frame");
gfxMatrix tm;
if (svgFrame) {
nsSVGElement *content = static_cast<nsSVGElement*>(aFrame->GetContent());
tm = content->PrependLocalTransformsTo(
GetCanvasTM(aFrame->GetParent(), aFor),
nsSVGElement::eUserSpaceToParent);
}
return tm;
}
void
nsSVGUtils::NotifyChildrenOfSVGChange(nsIFrame *aFrame, uint32_t aFlags)
{
nsIFrame *kid = aFrame->GetFirstPrincipalChild();
while (kid) {
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
SVGFrame->NotifySVGChanged(aFlags);
} else {
NS_ASSERTION(kid->IsFrameOfType(nsIFrame::eSVG) || kid->IsSVGText(),
"SVG frame expected");
// recurse into the children of container frames e.g. <clipPath>, <mask>
// in case they have child frames with transformation matrices
if (kid->IsFrameOfType(nsIFrame::eSVG)) {
NotifyChildrenOfSVGChange(kid, aFlags);
}
}
kid = kid->GetNextSibling();
}
}
// ************************************************************
class SVGPaintCallback : public nsSVGFilterPaintCallback
{
public:
virtual void Paint(nsRenderingContext *aContext, nsIFrame *aTarget,
const nsIntRect* aDirtyRect)
{
nsISVGChildFrame *svgChildFrame = do_QueryFrame(aTarget);
NS_ASSERTION(svgChildFrame, "Expected SVG frame here");
nsIntRect* dirtyRect = nullptr;
nsIntRect tmpDirtyRect;
// aDirtyRect is in user-space pixels, we need to convert to
// outer-SVG-frame-relative device pixels.
if (aDirtyRect) {
gfxMatrix userToDeviceSpace =
nsSVGUtils::GetCanvasTM(aTarget, nsISVGChildFrame::FOR_PAINTING);
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxRect dirtyBounds = userToDeviceSpace.TransformBounds(
gfxRect(aDirtyRect->x, aDirtyRect->y, aDirtyRect->width, aDirtyRect->height));
dirtyBounds.RoundOut();
if (gfxUtils::GfxRectToIntRect(dirtyBounds, &tmpDirtyRect)) {
dirtyRect = &tmpDirtyRect;
}
}
svgChildFrame->PaintSVG(aContext, dirtyRect);
}
};
void
nsSVGUtils::PaintFrameWithEffects(nsRenderingContext *aContext,
const nsIntRect *aDirtyRect,
nsIFrame *aFrame)
{
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) ||
aFrame->PresContext()->IsGlyph(),
"If display lists are enabled, only painting of non-display "
"SVG should take this code path");
nsISVGChildFrame *svgChildFrame = do_QueryFrame(aFrame);
if (!svgChildFrame)
return;
float opacity = aFrame->StyleDisplay()->mOpacity;
if (opacity == 0.0f)
return;
const nsIContent* content = aFrame->GetContent();
if (content->IsSVG() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return;
}
/* Properties are added lazily and may have been removed by a restyle,
so make sure all applicable ones are set again. */
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(aFrame);
bool isOK = true;
nsSVGFilterFrame *filterFrame = effectProperties.GetFilterFrame(&isOK);
if (aDirtyRect &&
!(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
// Here we convert aFrame's paint bounds to outer-<svg> device space,
// compare it to aDirtyRect, and return early if they don't intersect.
// We don't do this optimization for nondisplay SVG since nondisplay
// SVG doesn't maintain bounds/overflow rects.
nsRect overflowRect = aFrame->GetVisualOverflowRectRelativeToSelf();
if (aFrame->IsFrameOfType(nsIFrame::eSVGGeometry) ||
aFrame->IsSVGText()) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
overflowRect = overflowRect + aFrame->GetPosition();
}
int32_t appUnitsPerDevPx = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxMatrix tm = GetCanvasTM(aFrame, nsISVGChildFrame::FOR_PAINTING);
if (aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
gfxMatrix childrenOnlyTM;
if (static_cast<nsSVGContainerFrame*>(aFrame)->
HasChildrenOnlyTransform(&childrenOnlyTM)) {
// Undo the children-only transform:
tm = childrenOnlyTM.Invert() * tm;
}
}
nsIntRect bounds = TransformFrameRectToOuterSVG(overflowRect,
tm, aFrame->PresContext()).
ToOutsidePixels(appUnitsPerDevPx);
if (!aDirtyRect->Intersects(bounds)) {
return;
}
}
/* SVG defines the following rendering model:
*
* 1. Render fill
* 2. Render stroke
* 3. Render markers
* 4. Apply filter
* 5. Apply clipping, masking, group opacity
*
* We follow this, but perform a couple of optimizations:
*
* + Use cairo's clipPath when representable natively (single object
* clip region).
*
* + Merge opacity and masking if both used together.
*/
if (opacity != 1.0f && CanOptimizeOpacity(aFrame))
opacity = 1.0f;
gfxContext *gfx = aContext->ThebesContext();
bool complexEffects = false;
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame(&isOK);
nsSVGMaskFrame *maskFrame = effectProperties.GetMaskFrame(&isOK);
bool isTrivialClip = clipPathFrame ? clipPathFrame->IsTrivial() : true;
if (!isOK) {
// Some resource is invalid. We shouldn't paint anything.
return;
}
gfxMatrix matrix;
if (clipPathFrame || maskFrame)
matrix = GetCanvasTM(aFrame, nsISVGChildFrame::FOR_PAINTING);
/* Check if we need to do additional operations on this child's
* rendering, which necessitates rendering into another surface. */
if (opacity != 1.0f || maskFrame || (clipPathFrame && !isTrivialClip)) {
complexEffects = true;
gfx->Save();
if (!(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
// aFrame has a valid visual overflow rect, so clip to it before calling
// PushGroup() to minimize the size of the surfaces we'll composite:
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(gfx);
gfx->Multiply(GetCanvasTM(aFrame, nsISVGChildFrame::FOR_PAINTING));
nsRect overflowRect = aFrame->GetVisualOverflowRectRelativeToSelf();
if (aFrame->IsFrameOfType(nsIFrame::eSVGGeometry) ||
aFrame->IsSVGText()) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
overflowRect = overflowRect + aFrame->GetPosition();
}
aContext->IntersectClip(overflowRect);
}
gfx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
}
/* If this frame has only a trivial clipPath, set up cairo's clipping now so
* we can just do normal painting and get it clipped appropriately.
*/
if (clipPathFrame && isTrivialClip) {
gfx->Save();
clipPathFrame->ClipPaint(aContext, aFrame, matrix);
}
/* Paint the child */
if (filterFrame) {
nsRect* dirtyRect = nullptr;
nsRect tmpDirtyRect;
if (aDirtyRect) {
// aDirtyRect is in outer-<svg> device pixels, but the filter code needs
// it in frame space.
gfxMatrix userToDeviceSpace =
GetUserToCanvasTM(aFrame, nsISVGChildFrame::FOR_OUTERSVG_TM);
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxMatrix deviceToUserSpace = userToDeviceSpace;
deviceToUserSpace.Invert();
gfxRect dirtyBounds = deviceToUserSpace.TransformBounds(
gfxRect(aDirtyRect->x, aDirtyRect->y,
aDirtyRect->width, aDirtyRect->height));
tmpDirtyRect =
nsLayoutUtils::RoundGfxRectToAppRect(
dirtyBounds, aFrame->PresContext()->AppUnitsPerCSSPixel()) -
aFrame->GetPosition();
dirtyRect = &tmpDirtyRect;
}
SVGPaintCallback paintCallback;
filterFrame->PaintFilteredFrame(aContext, aFrame, &paintCallback, dirtyRect);
} else {
svgChildFrame->PaintSVG(aContext, aDirtyRect);
}
if (clipPathFrame && isTrivialClip) {
gfx->Restore();
}
/* No more effects, we're done. */
if (!complexEffects)
return;
gfx->PopGroupToSource();
nsRefPtr<gfxPattern> maskSurface =
maskFrame ? maskFrame->ComputeMaskAlpha(aContext, aFrame,
matrix, opacity) : nullptr;
nsRefPtr<gfxPattern> clipMaskSurface;
if (clipPathFrame && !isTrivialClip) {
gfx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
nsresult rv = clipPathFrame->ClipPaint(aContext, aFrame, matrix);
clipMaskSurface = gfx->PopGroup();
if (NS_SUCCEEDED(rv) && clipMaskSurface) {
// Still more set after clipping, so clip to another surface
if (maskSurface || opacity != 1.0f) {
gfx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
gfx->Mask(clipMaskSurface);
gfx->PopGroupToSource();
} else {
gfx->Mask(clipMaskSurface);
}
}
}
if (maskSurface) {
gfx->Mask(maskSurface);
} else if (opacity != 1.0f) {
gfx->Paint(opacity);
}
gfx->Restore();
}
bool
nsSVGUtils::HitTestClip(nsIFrame *aFrame, const nsPoint &aPoint)
{
nsSVGEffects::EffectProperties props =
nsSVGEffects::GetEffectProperties(aFrame);
if (!props.mClipPath)
return true;
bool isOK = true;
nsSVGClipPathFrame *clipPathFrame = props.GetClipPathFrame(&isOK);
if (!clipPathFrame || !isOK) {
// clipPath is not a valid resource, so nothing gets painted, so
// hit-testing must fail.
return false;
}
return clipPathFrame->ClipHitTest(aFrame, GetCanvasTM(aFrame,
nsISVGChildFrame::FOR_HIT_TESTING), aPoint);
}
nsIFrame *
nsSVGUtils::HitTestChildren(nsIFrame *aFrame, const nsPoint &aPoint)
{
// Traverse the list in reverse order, so that if we get a hit we know that's
// the topmost frame that intersects the point; then we can just return it.
nsIFrame* result = nullptr;
for (nsIFrame* current = aFrame->PrincipalChildList().LastChild();
current;
current = current->GetPrevSibling()) {
nsISVGChildFrame* SVGFrame = do_QueryFrame(current);
if (SVGFrame) {
const nsIContent* content = current->GetContent();
if (content->IsSVG() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
continue;
}
result = SVGFrame->GetFrameForPoint(aPoint);
if (result)
break;
}
}
if (result && !HitTestClip(aFrame, aPoint))
result = nullptr;
return result;
}
nsRect
nsSVGUtils::GetCoveredRegion(const nsFrameList &aFrames)
{
nsRect rect;
for (nsIFrame* kid = aFrames.FirstChild();
kid;
kid = kid->GetNextSibling()) {
nsISVGChildFrame* child = do_QueryFrame(kid);
if (child) {
nsRect childRect = child->GetCoveredRegion();
rect.UnionRect(rect, childRect);
}
}
return rect;
}
nsPoint
nsSVGUtils::TransformOuterSVGPointToChildFrame(nsPoint aPoint,
const gfxMatrix& aFrameToCanvasTM,
nsPresContext* aPresContext)
{
NS_ABORT_IF_FALSE(!aFrameToCanvasTM.IsSingular(),
"Callers must not pass a singular matrix");
gfxMatrix canvasDevToFrameUserSpace = aFrameToCanvasTM;
canvasDevToFrameUserSpace.Invert();
gfxPoint devPt = gfxPoint(aPoint.x, aPoint.y) /
aPresContext->AppUnitsPerDevPixel();
gfxPoint userPt = canvasDevToFrameUserSpace.Transform(devPt);
gfxPoint appPt = (userPt * aPresContext->AppUnitsPerCSSPixel()).Round();
userPt.x = clamped(appPt.x, gfxFloat(nscoord_MIN), gfxFloat(nscoord_MAX));
userPt.y = clamped(appPt.y, gfxFloat(nscoord_MIN), gfxFloat(nscoord_MAX));
// now guaranteed to be safe:
return nsPoint(nscoord(userPt.x), nscoord(userPt.y));
}
nsRect
nsSVGUtils::TransformFrameRectToOuterSVG(const nsRect& aRect,
const gfxMatrix& aMatrix,
nsPresContext* aPresContext)
{
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
r.Scale(1.0 / nsPresContext::AppUnitsPerCSSPixel());
return nsLayoutUtils::RoundGfxRectToAppRect(
aMatrix.TransformBounds(r), aPresContext->AppUnitsPerDevPixel());
}
gfxIntSize
nsSVGUtils::ConvertToSurfaceSize(const gfxSize& aSize,
bool *aResultOverflows)
{
gfxIntSize surfaceSize(ClampToInt(ceil(aSize.width)), ClampToInt(ceil(aSize.height)));
*aResultOverflows = surfaceSize.width != ceil(aSize.width) ||
surfaceSize.height != ceil(aSize.height);
if (!gfxASurface::CheckSurfaceSize(surfaceSize)) {
surfaceSize.width = std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION,
surfaceSize.width);
surfaceSize.height = std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION,
surfaceSize.height);
*aResultOverflows = true;
}
return surfaceSize;
}
bool
nsSVGUtils::HitTestRect(const gfxMatrix &aMatrix,
float aRX, float aRY, float aRWidth, float aRHeight,
float aX, float aY)
{
gfxRect rect(aRX, aRY, aRWidth, aRHeight);
if (rect.IsEmpty() || aMatrix.IsSingular()) {
return false;
}
gfxMatrix toRectSpace = aMatrix;
toRectSpace.Invert();
gfxPoint p = toRectSpace.Transform(gfxPoint(aX, aY));
return rect.x <= p.x && p.x <= rect.XMost() &&
rect.y <= p.y && p.y <= rect.YMost();
}
gfxRect
nsSVGUtils::GetClipRectForFrame(nsIFrame *aFrame,
float aX, float aY, float aWidth, float aHeight)
{
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if (!(disp->mClipFlags & NS_STYLE_CLIP_RECT)) {
NS_ASSERTION(disp->mClipFlags == NS_STYLE_CLIP_AUTO,
"We don't know about this type of clip.");
return gfxRect(aX, aY, aWidth, aHeight);
}
if (disp->mOverflowX == NS_STYLE_OVERFLOW_HIDDEN ||
disp->mOverflowY == NS_STYLE_OVERFLOW_HIDDEN) {
nsIntRect clipPxRect =
disp->mClip.ToOutsidePixels(aFrame->PresContext()->AppUnitsPerDevPixel());
gfxRect clipRect =
gfxRect(clipPxRect.x, clipPxRect.y, clipPxRect.width, clipPxRect.height);
if (NS_STYLE_CLIP_RIGHT_AUTO & disp->mClipFlags) {
clipRect.width = aWidth - clipRect.X();
}
if (NS_STYLE_CLIP_BOTTOM_AUTO & disp->mClipFlags) {
clipRect.height = aHeight - clipRect.Y();
}
if (disp->mOverflowX != NS_STYLE_OVERFLOW_HIDDEN) {
clipRect.x = aX;
clipRect.width = aWidth;
}
if (disp->mOverflowY != NS_STYLE_OVERFLOW_HIDDEN) {
clipRect.y = aY;
clipRect.height = aHeight;
}
return clipRect;
}
return gfxRect(aX, aY, aWidth, aHeight);
}
void
nsSVGUtils::CompositeSurfaceMatrix(gfxContext *aContext,
gfxASurface *aSurface,
const gfxMatrix &aCTM, float aOpacity)
{
if (aCTM.IsSingular())
return;
if (aContext->IsCairo()) {
aContext->Save();
aContext->Multiply(aCTM);
aContext->SetSource(aSurface);
aContext->Paint(aOpacity);
aContext->Restore();
} else {
DrawTarget *dt = aContext->GetDrawTarget();
Matrix oldMat = dt->GetTransform();
RefPtr<SourceSurface> surf =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(dt, aSurface);
dt->SetTransform(ToMatrix(aCTM) * oldMat);
gfxSize size = aSurface->GetSize();
NS_ASSERTION(size.width >= 0 && size.height >= 0, "Failure to get size for aSurface.");
gfxPoint pt = aSurface->GetDeviceOffset();
dt->FillRect(Rect(-pt.x, -pt.y, size.width, size.height),
SurfacePattern(surf, EXTEND_CLAMP,
Matrix(1.0f, 0, 0, 1.0f, -pt.x, -pt.y)),
DrawOptions(aOpacity));
dt->SetTransform(oldMat);
}
}
void
nsSVGUtils::CompositePatternMatrix(gfxContext *aContext,
gfxPattern *aPattern,
const gfxMatrix &aCTM, float aWidth, float aHeight, float aOpacity)
{
if (aCTM.IsSingular())
return;
aContext->Save();
SetClipRect(aContext, aCTM, gfxRect(0, 0, aWidth, aHeight));
aContext->Multiply(aCTM);
aContext->SetPattern(aPattern);
aContext->Paint(aOpacity);
aContext->Restore();
}
void
nsSVGUtils::SetClipRect(gfxContext *aContext,
const gfxMatrix &aCTM,
const gfxRect &aRect)
{
if (aCTM.IsSingular())
return;
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(aContext);
aContext->Multiply(aCTM);
aContext->Clip(aRect);
}
void
nsSVGUtils::ClipToGfxRect(nsIntRect* aRect, const gfxRect& aGfxRect)
{
gfxRect r = aGfxRect;
r.RoundOut();
gfxRect r2(aRect->x, aRect->y, aRect->width, aRect->height);
r = r.Intersect(r2);
*aRect = nsIntRect(int32_t(r.X()), int32_t(r.Y()),
int32_t(r.Width()), int32_t(r.Height()));
}
gfxRect
nsSVGUtils::GetBBox(nsIFrame *aFrame, uint32_t aFlags)
{
if (aFrame->GetContent()->IsNodeOfType(nsINode::eTEXT)) {
aFrame = aFrame->GetParent();
}
gfxRect bbox;
nsISVGChildFrame *svg = do_QueryFrame(aFrame);
if (svg || aFrame->IsSVGText()) {
// It is possible to apply a gradient, pattern, clipping path, mask or
// filter to text. When one of these facilities is applied to text
// the bounding box is the entire text element in all
// cases.
if (aFrame->IsSVGText()) {
nsIFrame* ancestor = GetFirstNonAAncestorFrame(aFrame);
if (ancestor && ancestor->IsSVGText()) {
while (ancestor->GetType() != nsGkAtoms::svgTextFrame2) {
ancestor = ancestor->GetParent();
}
}
svg = do_QueryFrame(ancestor);
} else {
nsSVGTextContainerFrame* metrics = do_QueryFrame(
GetFirstNonAAncestorFrame(aFrame));
if (metrics) {
while (aFrame->GetType() != nsGkAtoms::svgTextFrame) {
aFrame = aFrame->GetParent();
}
svg = do_QueryFrame(aFrame);
}
}
nsIContent* content = aFrame->GetContent();
if (content->IsSVG() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return bbox;
}
gfxMatrix matrix;
if (aFrame->GetType() == nsGkAtoms::svgForeignObjectFrame) {
// The spec says getBBox "Returns the tight bounding box in *current user
// space*". So we should really be doing this for all elements, but that
// needs investigation to check that we won't break too much content.
NS_ABORT_IF_FALSE(content->IsSVG(), "bad cast");
nsSVGElement *element = static_cast<nsSVGElement*>(content);
matrix = element->PrependLocalTransformsTo(matrix,
nsSVGElement::eChildToUserSpace);
}
return svg->GetBBoxContribution(matrix, aFlags);
}
return nsSVGIntegrationUtils::GetSVGBBoxForNonSVGFrame(aFrame);
}
gfxRect
nsSVGUtils::GetRelativeRect(uint16_t aUnits, const nsSVGLength2 *aXYWH,
const gfxRect &aBBox, nsIFrame *aFrame)
{
float x, y, width, height;
if (aUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
x = aBBox.X() + ObjectSpace(aBBox, &aXYWH[0]);
y = aBBox.Y() + ObjectSpace(aBBox, &aXYWH[1]);
width = ObjectSpace(aBBox, &aXYWH[2]);
height = ObjectSpace(aBBox, &aXYWH[3]);
} else {
x = UserSpace(aFrame, &aXYWH[0]);
y = UserSpace(aFrame, &aXYWH[1]);
width = UserSpace(aFrame, &aXYWH[2]);
height = UserSpace(aFrame, &aXYWH[3]);
}
return gfxRect(x, y, width, height);
}
bool
nsSVGUtils::CanOptimizeOpacity(nsIFrame *aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
return false;
}
nsIAtom *type = aFrame->GetType();
if (type != nsGkAtoms::svgImageFrame &&
type != nsGkAtoms::svgPathGeometryFrame) {
return false;
}
if (aFrame->StyleSVGReset()->mFilter) {
return false;
}
// XXX The SVG WG is intending to allow fill, stroke and markers on <image>
if (type == nsGkAtoms::svgImageFrame) {
return true;
}
const nsStyleSVG *style = aFrame->StyleSVG();
if (style->HasMarker()) {
return false;
}
if (style->mFill.mType == eStyleSVGPaintType_None ||
style->mFillOpacity <= 0 ||
!HasStroke(aFrame)) {
return true;
}
return false;
}
float
nsSVGUtils::MaxExpansion(const gfxMatrix &aMatrix)
{
// maximum expansion derivation from
// http://lists.cairographics.org/archives/cairo/2004-October/001980.html
// and also implemented in cairo_matrix_transformed_circle_major_axis
double a = aMatrix.xx;
double b = aMatrix.yx;
double c = aMatrix.xy;
double d = aMatrix.yy;
double f = (a * a + b * b + c * c + d * d) / 2;
double g = (a * a + b * b - c * c - d * d) / 2;
double h = a * c + b * d;
return sqrt(f + sqrt(g * g + h * h));
}
gfxMatrix
nsSVGUtils::AdjustMatrixForUnits(const gfxMatrix &aMatrix,
nsSVGEnum *aUnits,
nsIFrame *aFrame)
{
if (aFrame &&
aUnits->GetAnimValue() == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
gfxRect bbox = GetBBox(aFrame);
return gfxMatrix().Scale(bbox.Width(), bbox.Height()) *
gfxMatrix().Translate(gfxPoint(bbox.X(), bbox.Y())) *
aMatrix;
}
return aMatrix;
}
nsIFrame*
nsSVGUtils::GetFirstNonAAncestorFrame(nsIFrame* aStartFrame)
{
for (nsIFrame *ancestorFrame = aStartFrame; ancestorFrame;
ancestorFrame = ancestorFrame->GetParent()) {
if (ancestorFrame->GetType() != nsGkAtoms::svgAFrame) {
return ancestorFrame;
}
}
return nullptr;
}
gfxMatrix
nsSVGUtils::GetStrokeTransform(nsIFrame *aFrame)
{
if (aFrame->GetContent()->IsNodeOfType(nsINode::eTEXT)) {
aFrame = aFrame->GetParent();
}
if (aFrame->StyleSVGReset()->mVectorEffect ==
NS_STYLE_VECTOR_EFFECT_NON_SCALING_STROKE) {
nsIContent *content = aFrame->GetContent();
NS_ABORT_IF_FALSE(content->IsSVG(), "bad cast");
// a non-scaling stroke is in the screen co-ordinate
// space rather so we need to invert the transform
// to the screen co-ordinate space to get there.
// See http://www.w3.org/TR/SVGTiny12/painting.html#NonScalingStroke
gfxMatrix transform = SVGContentUtils::GetCTM(
static_cast<nsSVGElement*>(content), true);
if (!transform.IsSingular()) {
return transform.Invert();
}
}
return gfxMatrix();
}
// The logic here comes from _cairo_stroke_style_max_distance_from_path
static gfxRect
PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsIFrame* aFrame,
double aStyleExpansionFactor,
const gfxMatrix& aMatrix)
{
double style_expansion =
aStyleExpansionFactor * nsSVGUtils::GetStrokeWidth(aFrame);
gfxMatrix matrix = aMatrix;
matrix.Multiply(nsSVGUtils::GetStrokeTransform(aFrame));
double dx = style_expansion * (fabs(matrix.xx) + fabs(matrix.xy));
double dy = style_expansion * (fabs(matrix.yy) + fabs(matrix.yx));
gfxRect strokeExtents = aPathExtents;
strokeExtents.Inflate(dx, dy);
return strokeExtents;
}
/*static*/ gfxRect
nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsSVGGeometryFrame* aFrame,
const gfxMatrix& aMatrix)
{
return ::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5, aMatrix);
}
/*static*/ gfxRect
nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsTextFrame* aFrame,
const gfxMatrix& aMatrix)
{
NS_ASSERTION(aFrame->IsSVGText(), "expected an nsTextFrame for SVG text");
return ::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5, aMatrix);
}
/*static*/ gfxRect
nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsSVGPathGeometryFrame* aFrame,
const gfxMatrix& aMatrix)
{
double styleExpansionFactor = 0.5;
if (static_cast<nsSVGPathGeometryElement*>(aFrame->GetContent())->IsMarkable()) {
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mStrokeLinecap == NS_STYLE_STROKE_LINECAP_SQUARE) {
styleExpansionFactor = M_SQRT1_2;
}
if (style->mStrokeLinejoin == NS_STYLE_STROKE_LINEJOIN_MITER &&
styleExpansionFactor < style->mStrokeMiterlimit &&
aFrame->GetContent()->Tag() != nsGkAtoms::line) {
styleExpansionFactor = style->mStrokeMiterlimit;
}
}
return ::PathExtentsToMaxStrokeExtents(aPathExtents,
aFrame,
styleExpansionFactor,
aMatrix);
}
// ----------------------------------------------------------------------
/* static */ nscolor
nsSVGUtils::GetFallbackOrPaintColor(gfxContext *aContext, nsStyleContext *aStyleContext,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke)
{
const nsStyleSVGPaint &paint = aStyleContext->StyleSVG()->*aFillOrStroke;
nsStyleContext *styleIfVisited = aStyleContext->GetStyleIfVisited();
bool isServer = paint.mType == eStyleSVGPaintType_Server ||
paint.mType == eStyleSVGPaintType_ObjectFill ||
paint.mType == eStyleSVGPaintType_ObjectStroke;
nscolor color = isServer ? paint.mFallbackColor : paint.mPaint.mColor;
if (styleIfVisited) {
const nsStyleSVGPaint &paintIfVisited =
styleIfVisited->StyleSVG()->*aFillOrStroke;
// To prevent Web content from detecting if a user has visited a URL
// (via URL loading triggered by paint servers or performance
// differences between paint servers or between a paint server and a
// color), we do not allow whether links are visited to change which
// paint server is used or switch between paint servers and simple
// colors. A :visited style may only override a simple color with
// another simple color.
if (paintIfVisited.mType == eStyleSVGPaintType_Color &&
paint.mType == eStyleSVGPaintType_Color) {
nscolor colors[2] = { color, paintIfVisited.mPaint.mColor };
return nsStyleContext::CombineVisitedColors(
colors, aStyleContext->RelevantLinkVisited());
}
}
return color;
}
static void
SetupFallbackOrPaintColor(gfxContext *aContext, nsStyleContext *aStyleContext,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
float aOpacity)
{
nscolor color = nsSVGUtils::GetFallbackOrPaintColor(
aContext, aStyleContext, aFillOrStroke);
aContext->SetColor(gfxRGBA(NS_GET_R(color)/255.0,
NS_GET_G(color)/255.0,
NS_GET_B(color)/255.0,
NS_GET_A(color)/255.0 * aOpacity));
}
static float
MaybeOptimizeOpacity(nsIFrame *aFrame, float aFillOrStrokeOpacity)
{
float opacity = aFrame->StyleDisplay()->mOpacity;
if (opacity < 1 && nsSVGUtils::CanOptimizeOpacity(aFrame)) {
return aFillOrStrokeOpacity * opacity;
}
return aFillOrStrokeOpacity;
}
/* static */ bool
nsSVGUtils::SetupObjectPaint(gfxContext *aContext,
gfxTextObjectPaint *aObjectPaint,
const nsStyleSVGPaint &aPaint,
float aOpacity)
{
nsRefPtr<gfxPattern> pattern;
if (!aObjectPaint) {
return false;
}
switch (aPaint.mType) {
case eStyleSVGPaintType_ObjectFill:
pattern = aObjectPaint->GetFillPattern(aOpacity, aContext->CurrentMatrix());
break;
case eStyleSVGPaintType_ObjectStroke:
pattern = aObjectPaint->GetStrokePattern(aOpacity, aContext->CurrentMatrix());
break;
default:
return false;
}
if (!pattern) {
return false;
}
aContext->SetPattern(pattern);
return true;
}
bool
nsSVGUtils::SetupCairoFillPaint(nsIFrame *aFrame, gfxContext* aContext,
gfxTextObjectPaint *aObjectPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mFill.mType == eStyleSVGPaintType_None)
return false;
if (style->mFillRule == NS_STYLE_FILL_RULE_EVENODD)
aContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
else
aContext->SetFillRule(gfxContext::FILL_RULE_WINDING);
float opacity = MaybeOptimizeOpacity(aFrame,
GetOpacity(style->mFillOpacitySource,
style->mFillOpacity,
aObjectPaint));
nsSVGPaintServerFrame *ps =
nsSVGEffects::GetPaintServer(aFrame, &style->mFill, nsSVGEffects::FillProperty());
if (ps && ps->SetupPaintServer(aContext, aFrame, &nsStyleSVG::mFill, opacity))
return true;
if (SetupObjectPaint(aContext, aObjectPaint, style->mFill, opacity)) {
return true;
}
// On failure, use the fallback colour in case we have an
// objectBoundingBox where the width or height of the object is zero.
// See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox
SetupFallbackOrPaintColor(aContext, aFrame->StyleContext(),
&nsStyleSVG::mFill, opacity);
return true;
}
bool
nsSVGUtils::SetupCairoStrokePaint(nsIFrame *aFrame, gfxContext* aContext,
gfxTextObjectPaint *aObjectPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mStroke.mType == eStyleSVGPaintType_None)
return false;
float opacity = MaybeOptimizeOpacity(aFrame,
GetOpacity(style->mStrokeOpacitySource,
style->mStrokeOpacity,
aObjectPaint));
nsSVGPaintServerFrame *ps =
nsSVGEffects::GetPaintServer(aFrame, &style->mStroke, nsSVGEffects::StrokeProperty());
if (ps && ps->SetupPaintServer(aContext, aFrame, &nsStyleSVG::mStroke, opacity))
return true;
if (SetupObjectPaint(aContext, aObjectPaint, style->mStroke, opacity)) {
return true;
}
// On failure, use the fallback colour in case we have an
// objectBoundingBox where the width or height of the object is zero.
// See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox
SetupFallbackOrPaintColor(aContext, aFrame->StyleContext(),
&nsStyleSVG::mStroke, opacity);
return true;
}
/* static */ float
nsSVGUtils::GetOpacity(nsStyleSVGOpacitySource aOpacityType,
const float& aOpacity,
gfxTextObjectPaint *aOuterObjectPaint)
{
float opacity = 1.0f;
switch (aOpacityType) {
case eStyleSVGOpacitySource_Normal:
opacity = aOpacity;
break;
case eStyleSVGOpacitySource_ObjectFillOpacity:
if (aOuterObjectPaint) {
opacity = aOuterObjectPaint->GetFillOpacity();
} else {
NS_WARNING("objectFillOpacity used outside of an SVG glyph");
}
break;
case eStyleSVGOpacitySource_ObjectStrokeOpacity:
if (aOuterObjectPaint) {
opacity = aOuterObjectPaint->GetStrokeOpacity();
} else {
NS_WARNING("objectStrokeOpacity used outside of an SVG glyph");
}
break;
default:
NS_NOTREACHED("Unknown object opacity inheritance type for SVG glyph");
}
return opacity;
}
bool
nsSVGUtils::HasStroke(nsIFrame* aFrame, gfxTextObjectPaint *aObjectPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
return style->mStroke.mType != eStyleSVGPaintType_None &&
style->mStrokeOpacity > 0 &&
GetStrokeWidth(aFrame, aObjectPaint) > 0;
}
float
nsSVGUtils::GetStrokeWidth(nsIFrame* aFrame, gfxTextObjectPaint *aObjectPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
if (aObjectPaint && style->mStrokeWidthFromObject) {
return aObjectPaint->GetStrokeWidth();
}
nsIContent* content = aFrame->GetContent();
if (content->IsNodeOfType(nsINode::eTEXT)) {
content = content->GetParent();
}
nsSVGElement *ctx = static_cast<nsSVGElement*>(content);
return CoordToFloat(aFrame->PresContext(), ctx,
style->mStrokeWidth);
}
void
nsSVGUtils::SetupCairoStrokeBBoxGeometry(nsIFrame* aFrame,
gfxContext *aContext,
gfxTextObjectPaint *aObjectPaint)
{
float width = GetStrokeWidth(aFrame, aObjectPaint);
if (width <= 0)
return;
aContext->SetLineWidth(width);
// Apply any stroke-specific transform
aContext->Multiply(GetStrokeTransform(aFrame));
const nsStyleSVG* style = aFrame->StyleSVG();
switch (style->mStrokeLinecap) {
case NS_STYLE_STROKE_LINECAP_BUTT:
aContext->SetLineCap(gfxContext::LINE_CAP_BUTT);
break;
case NS_STYLE_STROKE_LINECAP_ROUND:
aContext->SetLineCap(gfxContext::LINE_CAP_ROUND);
break;
case NS_STYLE_STROKE_LINECAP_SQUARE:
aContext->SetLineCap(gfxContext::LINE_CAP_SQUARE);
break;
}
aContext->SetMiterLimit(style->mStrokeMiterlimit);
switch (style->mStrokeLinejoin) {
case NS_STYLE_STROKE_LINEJOIN_MITER:
aContext->SetLineJoin(gfxContext::LINE_JOIN_MITER);
break;
case NS_STYLE_STROKE_LINEJOIN_ROUND:
aContext->SetLineJoin(gfxContext::LINE_JOIN_ROUND);
break;
case NS_STYLE_STROKE_LINEJOIN_BEVEL:
aContext->SetLineJoin(gfxContext::LINE_JOIN_BEVEL);
break;
}
}
static bool
GetStrokeDashData(nsIFrame* aFrame,
FallibleTArray<gfxFloat>& aDashes,
gfxFloat* aDashOffset,
gfxTextObjectPaint *aObjectPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
nsPresContext *presContext = aFrame->PresContext();
nsIContent *content = aFrame->GetContent();
nsSVGElement *ctx = static_cast<nsSVGElement*>
(content->IsNodeOfType(nsINode::eTEXT) ?
content->GetParent() : content);
gfxFloat totalLength = 0.0;
if (aObjectPaint && style->mStrokeDasharrayFromObject) {
aDashes = aObjectPaint->GetStrokeDashArray();
for (uint32_t i = 0; i < aDashes.Length(); i++) {
if (aDashes[i] < 0.0) {
return false;
}
totalLength += aDashes[i];
}
} else {
uint32_t count = style->mStrokeDasharrayLength;
if (!count || !aDashes.SetLength(count)) {
return false;
}
gfxFloat pathScale = 1.0;
if (content->Tag() == nsGkAtoms::path) {
pathScale = static_cast<SVGPathElement*>(content)->
GetPathLengthScale(SVGPathElement::eForStroking);
if (pathScale <= 0) {
return false;
}
}
const nsStyleCoord *dasharray = style->mStrokeDasharray;
for (uint32_t i = 0; i < count; i++) {
aDashes[i] = nsSVGUtils::CoordToFloat(presContext,
ctx,
dasharray[i]) * pathScale;
if (aDashes[i] < 0.0) {
return false;
}
totalLength += aDashes[i];
}
}
if (aObjectPaint && style->mStrokeDashoffsetFromObject) {
*aDashOffset = aObjectPaint->GetStrokeDashOffset();
} else {
*aDashOffset = nsSVGUtils::CoordToFloat(presContext,
ctx,
style->mStrokeDashoffset);
}
return (totalLength > 0.0);
}
void
nsSVGUtils::SetupCairoStrokeGeometry(nsIFrame* aFrame, gfxContext* aContext,
gfxTextObjectPaint *aObjectPaint)
{
SetupCairoStrokeBBoxGeometry(aFrame, aContext, aObjectPaint);
AutoFallibleTArray<gfxFloat, 10> dashes;
gfxFloat dashOffset;
if (GetStrokeDashData(aFrame, dashes, &dashOffset, aObjectPaint)) {
aContext->SetDash(dashes.Elements(), dashes.Length(), dashOffset);
}
}
uint16_t
nsSVGUtils::GetGeometryHitTestFlags(nsIFrame* aFrame)
{
uint16_t flags = 0;
switch(aFrame->StyleVisibility()->mPointerEvents) {
case NS_STYLE_POINTER_EVENTS_NONE:
break;
case NS_STYLE_POINTER_EVENTS_AUTO:
case NS_STYLE_POINTER_EVENTS_VISIBLEPAINTED:
if (aFrame->StyleVisibility()->IsVisible()) {
if (aFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_FILL;
if (aFrame->StyleSVG()->mStroke.mType != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_STROKE;
if (aFrame->StyleSVG()->mStrokeOpacity > 0)
flags |= SVG_HIT_TEST_CHECK_MRECT;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLEFILL:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_FILL;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLESTROKE:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_STROKE;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLE:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE;
}
break;
case NS_STYLE_POINTER_EVENTS_PAINTED:
if (aFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_FILL;
if (aFrame->StyleSVG()->mStroke.mType != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_STROKE;
if (aFrame->StyleSVG()->mStrokeOpacity)
flags |= SVG_HIT_TEST_CHECK_MRECT;
break;
case NS_STYLE_POINTER_EVENTS_FILL:
flags |= SVG_HIT_TEST_FILL;
break;
case NS_STYLE_POINTER_EVENTS_STROKE:
flags |= SVG_HIT_TEST_STROKE;
break;
case NS_STYLE_POINTER_EVENTS_ALL:
flags |= SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE;
break;
default:
NS_ERROR("not reached");
break;
}
return flags;
}
bool
nsSVGUtils::SetupCairoStroke(nsIFrame* aFrame, gfxContext* aContext,
gfxTextObjectPaint *aObjectPaint)
{
if (!HasStroke(aFrame, aObjectPaint)) {
return false;
}
SetupCairoStrokeGeometry(aFrame, aContext, aObjectPaint);
return SetupCairoStrokePaint(aFrame, aContext, aObjectPaint);
}
bool
nsSVGUtils::PaintSVGGlyph(Element* aElement, gfxContext* aContext,
gfxFont::DrawMode aDrawMode,
gfxTextObjectPaint* aObjectPaint)
{
nsIFrame* frame = aElement->GetPrimaryFrame();
nsISVGChildFrame* svgFrame = do_QueryFrame(frame);
MOZ_ASSERT(!frame || svgFrame, "Non SVG frame for SVG glyph");
if (svgFrame) {
nsRenderingContext context;
context.Init(frame->PresContext()->DeviceContext(), aContext);
context.AddUserData(&gfxTextObjectPaint::sUserDataKey, aObjectPaint, nullptr);
nsresult rv = svgFrame->PaintSVG(&context, nullptr);
if (NS_SUCCEEDED(rv)) {
return true;
}
}
return false;
}
bool
nsSVGUtils::GetSVGGlyphExtents(Element* aElement,
const gfxMatrix& aSVGToAppSpace,
gfxRect* aResult)
{
nsIFrame* frame = aElement->GetPrimaryFrame();
nsISVGChildFrame* svgFrame = do_QueryFrame(frame);
MOZ_ASSERT(!frame || svgFrame, "Non SVG frame for SVG glyph");
if (svgFrame) {
*aResult = svgFrame->GetBBoxContribution(aSVGToAppSpace,
nsSVGUtils::eBBoxIncludeFill | nsSVGUtils::eBBoxIncludeFillGeometry |
nsSVGUtils::eBBoxIncludeStroke | nsSVGUtils::eBBoxIncludeStrokeGeometry |
nsSVGUtils::eBBoxIncludeMarkers);
return true;
}
return false;
}
nsRect
nsSVGUtils::ToCanvasBounds(const gfxRect &aUserspaceRect,
const gfxMatrix &aToCanvas,
const nsPresContext *presContext)
{
return nsLayoutUtils::RoundGfxRectToAppRect(
aToCanvas.TransformBounds(aUserspaceRect),
presContext->AppUnitsPerDevPixel());
}
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