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/*
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
* Copyright (C) 2012 Intel Corporation. All rights reserved.
* Copyright (C) 2013, 2014 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CanvasRenderingContext2DBase.h"
#include "BitmapImage.h"
#include "CSSFontSelector.h"
#include "CSSParser.h"
#include "CSSPropertyNames.h"
#include "CachedImage.h"
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#include "DOMMatrix.h"
#include "DOMMatrix2DInit.h"
#include "DisplayListRecorder.h"
#include "DisplayListReplayer.h"
#include "FloatQuad.h"
#include "HTMLCanvasElement.h"
#include "HTMLImageElement.h"
#include "HTMLVideoElement.h"
#include "ImageBitmap.h"
#include "ImageBuffer.h"
#include "ImageData.h"
#include "Path2D.h"
#include "RenderElement.h"
#include "RenderImage.h"
#include "RenderLayer.h"
#include "RenderTheme.h"
#include "SecurityOrigin.h"
#include "StrokeStyleApplier.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "TextMetrics.h"
#include "TextRun.h"
#include "TypedOMCSSImageValue.h"
#include <wtf/CheckedArithmetic.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/MathExtras.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
using namespace HTMLNames;
WTF_MAKE_ISO_ALLOCATED_IMPL(CanvasRenderingContext2DBase);
#if USE(CG)
const ImageSmoothingQuality defaultSmoothingQuality = ImageSmoothingQuality::Low;
#else
const ImageSmoothingQuality defaultSmoothingQuality = ImageSmoothingQuality::Medium;
#endif
const int CanvasRenderingContext2DBase::DefaultFontSize = 10;
const char* const CanvasRenderingContext2DBase::DefaultFontFamily = "sans-serif";
const char* const CanvasRenderingContext2DBase::DefaultFont = "10px sans-serif";
struct DisplayListDrawingContext {
WTF_MAKE_FAST_ALLOCATED;
public:
GraphicsContext context;
DisplayList::DisplayList displayList;
DisplayListDrawingContext(GraphicsContext& context, const FloatRect& clip)
: DisplayListDrawingContext(context.state(), clip)
{
}
DisplayListDrawingContext(const GraphicsContextState& state, const FloatRect& clip)
: context([&](GraphicsContext& displayListContext) {
return std::make_unique<DisplayList::Recorder>(displayListContext, displayList, state, clip, AffineTransform());
})
{
}
};
typedef HashMap<const CanvasRenderingContext2DBase*, std::unique_ptr<DisplayList::DisplayList>> ContextDisplayListHashMap;
static ContextDisplayListHashMap& contextDisplayListMap()
{
static NeverDestroyed<ContextDisplayListHashMap> sharedHashMap;
return sharedHashMap;
}
class CanvasStrokeStyleApplier : public StrokeStyleApplier {
public:
CanvasStrokeStyleApplier(CanvasRenderingContext2DBase* canvasContext)
: m_canvasContext(canvasContext)
{
}
void strokeStyle(GraphicsContext* c) override
{
c->setStrokeThickness(m_canvasContext->lineWidth());
c->setLineCap(m_canvasContext->getLineCap());
c->setLineJoin(m_canvasContext->getLineJoin());
c->setMiterLimit(m_canvasContext->miterLimit());
const Vector<float>& lineDash = m_canvasContext->getLineDash();
DashArray convertedLineDash(lineDash.size());
for (size_t i = 0; i < lineDash.size(); ++i)
convertedLineDash[i] = static_cast<DashArrayElement>(lineDash[i]);
c->setLineDash(convertedLineDash, m_canvasContext->lineDashOffset());
}
private:
CanvasRenderingContext2DBase* m_canvasContext;
};
CanvasRenderingContext2DBase::CanvasRenderingContext2DBase(CanvasBase& canvas, bool usesCSSCompatibilityParseMode, bool usesDashboardCompatibilityMode)
: CanvasRenderingContext(canvas)
, m_stateStack(1)
, m_usesCSSCompatibilityParseMode(usesCSSCompatibilityParseMode)
#if ENABLE(DASHBOARD_SUPPORT)
, m_usesDashboardCompatibilityMode(usesDashboardCompatibilityMode)
#endif
{
#if !ENABLE(DASHBOARD_SUPPORT)
ASSERT_UNUSED(usesDashboardCompatibilityMode, !usesDashboardCompatibilityMode);
#endif
}
void CanvasRenderingContext2DBase::unwindStateStack()
{
// Ensure that the state stack in the ImageBuffer's context
// is cleared before destruction, to avoid assertions in the
// GraphicsContext dtor.
if (size_t stackSize = m_stateStack.size()) {
if (auto* context = canvasBase().existingDrawingContext()) {
while (--stackSize)
context->restore();
}
}
}
CanvasRenderingContext2DBase::~CanvasRenderingContext2DBase()
{
#if !ASSERT_DISABLED
unwindStateStack();
#endif
if (UNLIKELY(tracksDisplayListReplay()))
contextDisplayListMap().remove(this);
}
bool CanvasRenderingContext2DBase::isAccelerated() const
{
#if USE(IOSURFACE_CANVAS_BACKING_STORE) || ENABLE(ACCELERATED_2D_CANVAS)
auto* context = canvasBase().existingDrawingContext();
return context && context->isAcceleratedContext();
#else
return false;
#endif
}
void CanvasRenderingContext2DBase::reset()
{
unwindStateStack();
m_stateStack.resize(1);
m_stateStack.first() = State();
m_path.clear();
m_unrealizedSaveCount = 0;
m_recordingContext = nullptr;
}
CanvasRenderingContext2DBase::State::State()
: strokeStyle(Color::black)
, fillStyle(Color::black)
, lineWidth(1)
, lineCap(ButtCap)
, lineJoin(MiterJoin)
, miterLimit(10)
, shadowBlur(0)
, shadowColor(Color::transparent)
, globalAlpha(1)
, globalComposite(CompositeSourceOver)
, globalBlend(BlendMode::Normal)
, hasInvertibleTransform(true)
, lineDashOffset(0)
, imageSmoothingEnabled(true)
, imageSmoothingQuality(defaultSmoothingQuality)
, textAlign(StartTextAlign)
, textBaseline(AlphabeticTextBaseline)
, direction(Direction::Inherit)
, unparsedFont(DefaultFont)
{
}
CanvasRenderingContext2DBase::State::State(const State& other)
: unparsedStrokeColor(other.unparsedStrokeColor)
, unparsedFillColor(other.unparsedFillColor)
, strokeStyle(other.strokeStyle)
, fillStyle(other.fillStyle)
, lineWidth(other.lineWidth)
, lineCap(other.lineCap)
, lineJoin(other.lineJoin)
, miterLimit(other.miterLimit)
, shadowOffset(other.shadowOffset)
, shadowBlur(other.shadowBlur)
, shadowColor(other.shadowColor)
, globalAlpha(other.globalAlpha)
, globalComposite(other.globalComposite)
, globalBlend(other.globalBlend)
, transform(other.transform)
, hasInvertibleTransform(other.hasInvertibleTransform)
, lineDashOffset(other.lineDashOffset)
, imageSmoothingEnabled(other.imageSmoothingEnabled)
, imageSmoothingQuality(other.imageSmoothingQuality)
, textAlign(other.textAlign)
, textBaseline(other.textBaseline)
, direction(other.direction)
, unparsedFont(other.unparsedFont)
, font(other.font)
{
}
CanvasRenderingContext2DBase::State& CanvasRenderingContext2DBase::State::operator=(const State& other)
{
if (this == &other)
return *this;
unparsedStrokeColor = other.unparsedStrokeColor;
unparsedFillColor = other.unparsedFillColor;
strokeStyle = other.strokeStyle;
fillStyle = other.fillStyle;
lineWidth = other.lineWidth;
lineCap = other.lineCap;
lineJoin = other.lineJoin;
miterLimit = other.miterLimit;
shadowOffset = other.shadowOffset;
shadowBlur = other.shadowBlur;
shadowColor = other.shadowColor;
globalAlpha = other.globalAlpha;
globalComposite = other.globalComposite;
globalBlend = other.globalBlend;
transform = other.transform;
hasInvertibleTransform = other.hasInvertibleTransform;
imageSmoothingEnabled = other.imageSmoothingEnabled;
imageSmoothingQuality = other.imageSmoothingQuality;
textAlign = other.textAlign;
textBaseline = other.textBaseline;
direction = other.direction;
unparsedFont = other.unparsedFont;
font = other.font;
return *this;
}
CanvasRenderingContext2DBase::FontProxy::~FontProxy()
{
if (realized())
m_font.fontSelector()->unregisterForInvalidationCallbacks(*this);
}
CanvasRenderingContext2DBase::FontProxy::FontProxy(const FontProxy& other)
: m_font(other.m_font)
{
if (realized())
m_font.fontSelector()->registerForInvalidationCallbacks(*this);
}
auto CanvasRenderingContext2DBase::FontProxy::operator=(const FontProxy& other) -> FontProxy&
{
if (realized())
m_font.fontSelector()->unregisterForInvalidationCallbacks(*this);
m_font = other.m_font;
if (realized())
m_font.fontSelector()->registerForInvalidationCallbacks(*this);
return *this;
}
inline void CanvasRenderingContext2DBase::FontProxy::update(FontSelector& selector)
{
ASSERT(&selector == m_font.fontSelector()); // This is an invariant. We should only ever be registered for callbacks on m_font.m_fonts.m_fontSelector.
if (realized())
m_font.fontSelector()->unregisterForInvalidationCallbacks(*this);
m_font.update(&selector);
if (realized())
m_font.fontSelector()->registerForInvalidationCallbacks(*this);
ASSERT(&selector == m_font.fontSelector());
}
void CanvasRenderingContext2DBase::FontProxy::fontsNeedUpdate(FontSelector& selector)
{
ASSERT_ARG(selector, &selector == m_font.fontSelector());
ASSERT(realized());
update(selector);
}
void CanvasRenderingContext2DBase::FontProxy::initialize(FontSelector& fontSelector, const RenderStyle& newStyle)
{
// Beware! m_font.fontSelector() might not point to document.fontSelector()!
ASSERT(newStyle.fontCascade().fontSelector() == &fontSelector);
if (realized())
m_font.fontSelector()->unregisterForInvalidationCallbacks(*this);
m_font = newStyle.fontCascade();
m_font.update(&fontSelector);
ASSERT(&fontSelector == m_font.fontSelector());
m_font.fontSelector()->registerForInvalidationCallbacks(*this);
}
const FontMetrics& CanvasRenderingContext2DBase::FontProxy::fontMetrics() const
{
return m_font.fontMetrics();
}
const FontCascadeDescription& CanvasRenderingContext2DBase::FontProxy::fontDescription() const
{
return m_font.fontDescription();
}
float CanvasRenderingContext2DBase::FontProxy::width(const TextRun& textRun, GlyphOverflow* overflow) const
{
return m_font.width(textRun, 0, overflow);
}
void CanvasRenderingContext2DBase::FontProxy::drawBidiText(GraphicsContext& context, const TextRun& run, const FloatPoint& point, FontCascade::CustomFontNotReadyAction action) const
{
context.drawBidiText(m_font, run, point, action);
}
void CanvasRenderingContext2DBase::realizeSaves()
{
if (m_unrealizedSaveCount)
realizeSavesLoop();
if (m_unrealizedSaveCount) {
static NeverDestroyed<String> consoleMessage(MAKE_STATIC_STRING_IMPL("CanvasRenderingContext2D.save() has been called without a matching restore() too many times. Ignoring save()."));
canvasBase().scriptExecutionContext()->addConsoleMessage(MessageSource::Rendering, MessageLevel::Error, consoleMessage);
}
}
void CanvasRenderingContext2DBase::realizeSavesLoop()
{
ASSERT(m_unrealizedSaveCount);
ASSERT(m_stateStack.size() >= 1);
GraphicsContext* context = drawingContext();
do {
if (m_stateStack.size() > MaxSaveCount)
break;
m_stateStack.append(state());
if (context)
context->save();
} while (--m_unrealizedSaveCount);
}
void CanvasRenderingContext2DBase::restore()
{
if (m_unrealizedSaveCount) {
--m_unrealizedSaveCount;
return;
}
ASSERT(m_stateStack.size() >= 1);
if (m_stateStack.size() <= 1)
return;
m_path.transform(state().transform);
m_stateStack.removeLast();
if (Optional<AffineTransform> inverse = state().transform.inverse())
m_path.transform(inverse.value());
GraphicsContext* c = drawingContext();
if (!c)
return;
c->restore();
}
void CanvasRenderingContext2DBase::setStrokeStyle(CanvasStyle style)
{
if (!style.isValid())
return;
if (state().strokeStyle.isValid() && state().strokeStyle.isEquivalentColor(style))
return;
if (style.isCurrentColor() && is<HTMLCanvasElement>(canvasBase())) {
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
if (style.hasOverrideAlpha()) {
// FIXME: Should not use RGBA32 here.
style = CanvasStyle(colorWithOverrideAlpha(currentColor(&canvas).rgb(), style.overrideAlpha()));
} else
style = CanvasStyle(currentColor(&canvas));
} else
checkOrigin(style.canvasPattern().get());
realizeSaves();
State& state = modifiableState();
state.strokeStyle = style;
GraphicsContext* c = drawingContext();
if (!c)
return;
state.strokeStyle.applyStrokeColor(*c);
state.unparsedStrokeColor = String();
}
void CanvasRenderingContext2DBase::setFillStyle(CanvasStyle style)
{
if (!style.isValid())
return;
if (state().fillStyle.isValid() && state().fillStyle.isEquivalentColor(style))
return;
if (style.isCurrentColor() && is<HTMLCanvasElement>(canvasBase())) {
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
if (style.hasOverrideAlpha()) {
// FIXME: Should not use RGBA32 here.
style = CanvasStyle(colorWithOverrideAlpha(currentColor(&canvas).rgb(), style.overrideAlpha()));
} else
style = CanvasStyle(currentColor(&canvas));
} else
checkOrigin(style.canvasPattern().get());
realizeSaves();
State& state = modifiableState();
state.fillStyle = style;
GraphicsContext* c = drawingContext();
if (!c)
return;
state.fillStyle.applyFillColor(*c);
state.unparsedFillColor = String();
}
float CanvasRenderingContext2DBase::lineWidth() const
{
return state().lineWidth;
}
void CanvasRenderingContext2DBase::setLineWidth(float width)
{
if (!(std::isfinite(width) && width > 0))
return;
if (state().lineWidth == width)
return;
realizeSaves();
modifiableState().lineWidth = width;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setStrokeThickness(width);
}
static CanvasLineCap toCanvasLineCap(LineCap lineCap)
{
switch (lineCap) {
case ButtCap:
return CanvasLineCap::Butt;
case RoundCap:
return CanvasLineCap::Round;
case SquareCap:
return CanvasLineCap::Square;
}
ASSERT_NOT_REACHED();
return CanvasLineCap::Butt;
}
static LineCap fromCanvasLineCap(CanvasLineCap canvasLineCap)
{
switch (canvasLineCap) {
case CanvasLineCap::Butt:
return ButtCap;
case CanvasLineCap::Round:
return RoundCap;
case CanvasLineCap::Square:
return SquareCap;
}
ASSERT_NOT_REACHED();
return ButtCap;
}
CanvasLineCap CanvasRenderingContext2DBase::lineCap() const
{
return toCanvasLineCap(state().lineCap);
}
void CanvasRenderingContext2DBase::setLineCap(CanvasLineCap canvasLineCap)
{
auto lineCap = fromCanvasLineCap(canvasLineCap);
if (state().lineCap == lineCap)
return;
realizeSaves();
modifiableState().lineCap = lineCap;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setLineCap(lineCap);
}
void CanvasRenderingContext2DBase::setLineCap(const String& stringValue)
{
CanvasLineCap cap;
if (stringValue == "butt")
cap = CanvasLineCap::Butt;
else if (stringValue == "round")
cap = CanvasLineCap::Round;
else if (stringValue == "square")
cap = CanvasLineCap::Square;
else
return;
setLineCap(cap);
}
static CanvasLineJoin toCanvasLineJoin(LineJoin lineJoin)
{
switch (lineJoin) {
case RoundJoin:
return CanvasLineJoin::Round;
case BevelJoin:
return CanvasLineJoin::Bevel;
case MiterJoin:
return CanvasLineJoin::Miter;
}
ASSERT_NOT_REACHED();
return CanvasLineJoin::Round;
}
static LineJoin fromCanvasLineJoin(CanvasLineJoin canvasLineJoin)
{
switch (canvasLineJoin) {
case CanvasLineJoin::Round:
return RoundJoin;
case CanvasLineJoin::Bevel:
return BevelJoin;
case CanvasLineJoin::Miter:
return MiterJoin;
}
ASSERT_NOT_REACHED();
return RoundJoin;
}
CanvasLineJoin CanvasRenderingContext2DBase::lineJoin() const
{
return toCanvasLineJoin(state().lineJoin);
}
void CanvasRenderingContext2DBase::setLineJoin(CanvasLineJoin canvasLineJoin)
{
auto lineJoin = fromCanvasLineJoin(canvasLineJoin);
if (state().lineJoin == lineJoin)
return;
realizeSaves();
modifiableState().lineJoin = lineJoin;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setLineJoin(lineJoin);
}
void CanvasRenderingContext2DBase::setLineJoin(const String& stringValue)
{
CanvasLineJoin join;
if (stringValue == "round")
join = CanvasLineJoin::Round;
else if (stringValue == "bevel")
join = CanvasLineJoin::Bevel;
else if (stringValue == "miter")
join = CanvasLineJoin::Miter;
else
return;
setLineJoin(join);
}
float CanvasRenderingContext2DBase::miterLimit() const
{
return state().miterLimit;
}
void CanvasRenderingContext2DBase::setMiterLimit(float limit)
{
if (!(std::isfinite(limit) && limit > 0))
return;
if (state().miterLimit == limit)
return;
realizeSaves();
modifiableState().miterLimit = limit;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setMiterLimit(limit);
}
float CanvasRenderingContext2DBase::shadowOffsetX() const
{
return state().shadowOffset.width();
}
void CanvasRenderingContext2DBase::setShadowOffsetX(float x)
{
if (!std::isfinite(x))
return;
if (state().shadowOffset.width() == x)
return;
realizeSaves();
modifiableState().shadowOffset.setWidth(x);
applyShadow();
}
float CanvasRenderingContext2DBase::shadowOffsetY() const
{
return state().shadowOffset.height();
}
void CanvasRenderingContext2DBase::setShadowOffsetY(float y)
{
if (!std::isfinite(y))
return;
if (state().shadowOffset.height() == y)
return;
realizeSaves();
modifiableState().shadowOffset.setHeight(y);
applyShadow();
}
float CanvasRenderingContext2DBase::shadowBlur() const
{
return state().shadowBlur;
}
void CanvasRenderingContext2DBase::setShadowBlur(float blur)
{
if (!(std::isfinite(blur) && blur >= 0))
return;
if (state().shadowBlur == blur)
return;
realizeSaves();
modifiableState().shadowBlur = blur;
applyShadow();
}
String CanvasRenderingContext2DBase::shadowColor() const
{
return Color(state().shadowColor).serialized();
}
void CanvasRenderingContext2DBase::setShadowColor(const String& colorString)
{
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
Color color = parseColorOrCurrentColor(colorString, &canvas);
if (!color.isValid())
return;
if (state().shadowColor == color)
return;
realizeSaves();
modifiableState().shadowColor = color;
applyShadow();
}
const Vector<float>& CanvasRenderingContext2DBase::getLineDash() const
{
return state().lineDash;
}
static bool lineDashSequenceIsValid(const Vector<float>& dash)
{
for (size_t i = 0; i < dash.size(); i++) {
if (!std::isfinite(dash[i]) || dash[i] < 0)
return false;
}
return true;
}
void CanvasRenderingContext2DBase::setLineDash(const Vector<float>& dash)
{
if (!lineDashSequenceIsValid(dash))
return;
realizeSaves();
modifiableState().lineDash = dash;
// Spec requires the concatenation of two copies the dash list when the
// number of elements is odd
if (dash.size() % 2)
modifiableState().lineDash.appendVector(dash);
applyLineDash();
}
void CanvasRenderingContext2DBase::setWebkitLineDash(const Vector<float>& dash)
{
if (!lineDashSequenceIsValid(dash))
return;
realizeSaves();
modifiableState().lineDash = dash;
applyLineDash();
}
float CanvasRenderingContext2DBase::lineDashOffset() const
{
return state().lineDashOffset;
}
void CanvasRenderingContext2DBase::setLineDashOffset(float offset)
{
if (!std::isfinite(offset) || state().lineDashOffset == offset)
return;
realizeSaves();
modifiableState().lineDashOffset = offset;
applyLineDash();
}
void CanvasRenderingContext2DBase::applyLineDash() const
{
GraphicsContext* c = drawingContext();
if (!c)
return;
DashArray convertedLineDash(state().lineDash.size());
for (size_t i = 0; i < state().lineDash.size(); ++i)
convertedLineDash[i] = static_cast<DashArrayElement>(state().lineDash[i]);
c->setLineDash(convertedLineDash, state().lineDashOffset);
}
float CanvasRenderingContext2DBase::globalAlpha() const
{
return state().globalAlpha;
}
void CanvasRenderingContext2DBase::setGlobalAlpha(float alpha)
{
if (!(alpha >= 0 && alpha <= 1))
return;
if (state().globalAlpha == alpha)
return;
realizeSaves();
modifiableState().globalAlpha = alpha;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setAlpha(alpha);
}
String CanvasRenderingContext2DBase::globalCompositeOperation() const
{
return compositeOperatorName(state().globalComposite, state().globalBlend);
}
void CanvasRenderingContext2DBase::setGlobalCompositeOperation(const String& operation)
{
CompositeOperator op = CompositeSourceOver;
BlendMode blendMode = BlendMode::Normal;
if (!parseCompositeAndBlendOperator(operation, op, blendMode))
return;
if ((state().globalComposite == op) && (state().globalBlend == blendMode))
return;
realizeSaves();
modifiableState().globalComposite = op;
modifiableState().globalBlend = blendMode;
GraphicsContext* c = drawingContext();
if (!c)
return;
c->setCompositeOperation(op, blendMode);
}
void CanvasRenderingContext2DBase::scale(float sx, float sy)
{
GraphicsContext* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
if (!std::isfinite(sx) || !std::isfinite(sy))
return;
AffineTransform newTransform = state().transform;
newTransform.scaleNonUniform(sx, sy);
if (state().transform == newTransform)
return;
realizeSaves();
if (!sx || !sy) {
modifiableState().hasInvertibleTransform = false;
return;
}
modifiableState().transform = newTransform;
c->scale(FloatSize(sx, sy));
m_path.transform(AffineTransform().scaleNonUniform(1.0 / sx, 1.0 / sy));
}
void CanvasRenderingContext2DBase::rotate(float angleInRadians)
{
GraphicsContext* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
if (!std::isfinite(angleInRadians))
return;
AffineTransform newTransform = state().transform;
newTransform.rotate(angleInRadians / piDouble * 180.0);
if (state().transform == newTransform)
return;
realizeSaves();
modifiableState().transform = newTransform;
c->rotate(angleInRadians);
m_path.transform(AffineTransform().rotate(-angleInRadians / piDouble * 180.0));
}
void CanvasRenderingContext2DBase::translate(float tx, float ty)
{
GraphicsContext* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
if (!std::isfinite(tx) | !std::isfinite(ty))
return;
AffineTransform newTransform = state().transform;
newTransform.translate(tx, ty);
if (state().transform == newTransform)
return;
realizeSaves();
modifiableState().transform = newTransform;
c->translate(tx, ty);
m_path.transform(AffineTransform().translate(-tx, -ty));
}
void CanvasRenderingContext2DBase::transform(float m11, float m12, float m21, float m22, float dx, float dy)
{
GraphicsContext* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
if (!std::isfinite(m11) | !std::isfinite(m21) | !std::isfinite(dx) | !std::isfinite(m12) | !std::isfinite(m22) | !std::isfinite(dy))
return;
AffineTransform transform(m11, m12, m21, m22, dx, dy);
AffineTransform newTransform = state().transform * transform;
if (state().transform == newTransform)
return;
realizeSaves();
if (auto inverse = transform.inverse()) {
modifiableState().transform = newTransform;
c->concatCTM(transform);
m_path.transform(inverse.value());
return;
}
modifiableState().hasInvertibleTransform = false;
}
Ref<DOMMatrix> CanvasRenderingContext2DBase::getTransform() const
{
return DOMMatrix::create(state().transform.toTransformationMatrix(), DOMMatrixReadOnly::Is2D::Yes);
}
void CanvasRenderingContext2DBase::setTransform(float m11, float m12, float m21, float m22, float dx, float dy)
{
GraphicsContext* c = drawingContext();
if (!c)
return;
if (!std::isfinite(m11) | !std::isfinite(m21) | !std::isfinite(dx) | !std::isfinite(m12) | !std::isfinite(m22) | !std::isfinite(dy))
return;
resetTransform();
transform(m11, m12, m21, m22, dx, dy);
}
ExceptionOr<void> CanvasRenderingContext2DBase::setTransform(DOMMatrix2DInit&& matrixInit)
{
auto checkValid = DOMMatrixReadOnly::validateAndFixup(matrixInit);
if (checkValid.hasException())
return checkValid.releaseException();
setTransform(matrixInit.a.valueOr(1), matrixInit.b.valueOr(0), matrixInit.c.valueOr(0), matrixInit.d.valueOr(1), matrixInit.e.valueOr(0), matrixInit.f.valueOr(0));
return { };
}
void CanvasRenderingContext2DBase::resetTransform()
{
GraphicsContext* c = drawingContext();
if (!c)
return;
AffineTransform ctm = state().transform;
bool hasInvertibleTransform = state().hasInvertibleTransform;
realizeSaves();
c->setCTM(canvasBase().baseTransform());
modifiableState().transform = AffineTransform();
if (hasInvertibleTransform)
m_path.transform(ctm);
modifiableState().hasInvertibleTransform = true;
}
void CanvasRenderingContext2DBase::setStrokeColor(const String& color, Optional<float> alpha)
{
if (alpha) {
setStrokeStyle(CanvasStyle::createFromStringWithOverrideAlpha(color, alpha.value()));
return;
}
if (color == state().unparsedStrokeColor)
return;
realizeSaves();
setStrokeStyle(CanvasStyle::createFromString(color));
modifiableState().unparsedStrokeColor = color;
}
void CanvasRenderingContext2DBase::setStrokeColor(float grayLevel, float alpha)
{
if (state().strokeStyle.isValid() && state().strokeStyle.isEquivalentRGBA(grayLevel, grayLevel, grayLevel, alpha))
return;
setStrokeStyle(CanvasStyle(grayLevel, alpha));
}
void CanvasRenderingContext2DBase::setStrokeColor(float r, float g, float b, float a)
{
if (state().strokeStyle.isValid() && state().strokeStyle.isEquivalentRGBA(r, g, b, a))
return;
setStrokeStyle(CanvasStyle(r, g, b, a));
}
void CanvasRenderingContext2DBase::setStrokeColor(float c, float m, float y, float k, float a)
{
if (state().strokeStyle.isValid() && state().strokeStyle.isEquivalentCMYKA(c, m, y, k, a))
return;
setStrokeStyle(CanvasStyle(c, m, y, k, a));
}
void CanvasRenderingContext2DBase::setFillColor(const String& color, Optional<float> alpha)
{
if (alpha) {
setFillStyle(CanvasStyle::createFromStringWithOverrideAlpha(color, alpha.value()));
return;
}
if (color == state().unparsedFillColor)
return;
realizeSaves();
setFillStyle(CanvasStyle::createFromString(color));
modifiableState().unparsedFillColor = color;
}
void CanvasRenderingContext2DBase::setFillColor(float grayLevel, float alpha)
{
if (state().fillStyle.isValid() && state().fillStyle.isEquivalentRGBA(grayLevel, grayLevel, grayLevel, alpha))
return;
setFillStyle(CanvasStyle(grayLevel, alpha));
}
void CanvasRenderingContext2DBase::setFillColor(float r, float g, float b, float a)
{
if (state().fillStyle.isValid() && state().fillStyle.isEquivalentRGBA(r, g, b, a))
return;
setFillStyle(CanvasStyle(r, g, b, a));
}
void CanvasRenderingContext2DBase::setFillColor(float c, float m, float y, float k, float a)
{
if (state().fillStyle.isValid() && state().fillStyle.isEquivalentCMYKA(c, m, y, k, a))
return;
setFillStyle(CanvasStyle(c, m, y, k, a));
}
void CanvasRenderingContext2DBase::beginPath()
{
m_path.clear();
}
static bool validateRectForCanvas(float& x, float& y, float& width, float& height)
{
if (!std::isfinite(x) | !std::isfinite(y) | !std::isfinite(width) | !std::isfinite(height))
return false;
if (!width && !height)
return false;
if (width < 0) {
width = -width;
x -= width;
}
if (height < 0) {
height = -height;
y -= height;
}
return true;
}
bool CanvasRenderingContext2DBase::isFullCanvasCompositeMode(CompositeOperator op)
{
// See 4.8.11.1.3 Compositing
// CompositeSourceAtop and CompositeDestinationOut are not listed here as the platforms already
// implement the specification's behavior.
return op == CompositeSourceIn || op == CompositeSourceOut || op == CompositeDestinationIn || op == CompositeDestinationAtop;
}
static WindRule toWindRule(CanvasFillRule rule)
{
return rule == CanvasFillRule::Nonzero ? WindRule::NonZero : WindRule::EvenOdd;
}
void CanvasRenderingContext2DBase::fill(CanvasFillRule windingRule)
{
fillInternal(m_path, windingRule);
clearPathForDashboardBackwardCompatibilityMode();
}
void CanvasRenderingContext2DBase::stroke()
{
strokeInternal(m_path);
clearPathForDashboardBackwardCompatibilityMode();
}
void CanvasRenderingContext2DBase::clip(CanvasFillRule windingRule)
{
clipInternal(m_path, windingRule);
clearPathForDashboardBackwardCompatibilityMode();
}
void CanvasRenderingContext2DBase::fill(Path2D& path, CanvasFillRule windingRule)
{
fillInternal(path.path(), windingRule);
}
void CanvasRenderingContext2DBase::stroke(Path2D& path)
{
strokeInternal(path.path());
}
void CanvasRenderingContext2DBase::clip(Path2D& path, CanvasFillRule windingRule)
{
clipInternal(path.path(), windingRule);
}
void CanvasRenderingContext2DBase::fillInternal(const Path& path, CanvasFillRule windingRule)
{
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
// If gradient size is zero, then paint nothing.
auto gradient = c->fillGradient();
if (gradient && gradient->isZeroSize())
return;
if (!path.isEmpty()) {
auto savedFillRule = c->fillRule();
c->setFillRule(toWindRule(windingRule));
if (isFullCanvasCompositeMode(state().globalComposite)) {
beginCompositeLayer();
c->fillPath(path);
endCompositeLayer();
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
clearCanvas();
c->fillPath(path);
didDrawEntireCanvas();
} else {
c->fillPath(path);
didDraw(path.fastBoundingRect());
}
c->setFillRule(savedFillRule);
}
}
void CanvasRenderingContext2DBase::strokeInternal(const Path& path)
{
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
// If gradient size is zero, then paint nothing.
auto gradient = c->strokeGradient();
if (gradient && gradient->isZeroSize())
return;
if (!path.isEmpty()) {
if (isFullCanvasCompositeMode(state().globalComposite)) {
beginCompositeLayer();
c->strokePath(path);
endCompositeLayer();
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
clearCanvas();
c->strokePath(path);
didDrawEntireCanvas();
} else {
FloatRect dirtyRect = path.fastBoundingRect();
inflateStrokeRect(dirtyRect);
c->strokePath(path);
didDraw(dirtyRect);
}
}
}
void CanvasRenderingContext2DBase::clipInternal(const Path& path, CanvasFillRule windingRule)
{
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
realizeSaves();
c->canvasClip(path, toWindRule(windingRule));
}
void CanvasRenderingContext2DBase::beginCompositeLayer()
{
#if !USE(CAIRO)
drawingContext()->beginTransparencyLayer(1);
#endif
}
void CanvasRenderingContext2DBase::endCompositeLayer()
{
#if !USE(CAIRO)
drawingContext()->endTransparencyLayer();
#endif
}
bool CanvasRenderingContext2DBase::isPointInPath(float x, float y, CanvasFillRule windingRule)
{
return isPointInPathInternal(m_path, x, y, windingRule);
}
bool CanvasRenderingContext2DBase::isPointInStroke(float x, float y)
{
return isPointInStrokeInternal(m_path, x, y);
}
bool CanvasRenderingContext2DBase::isPointInPath(Path2D& path, float x, float y, CanvasFillRule windingRule)
{
return isPointInPathInternal(path.path(), x, y, windingRule);
}
bool CanvasRenderingContext2DBase::isPointInStroke(Path2D& path, float x, float y)
{
return isPointInStrokeInternal(path.path(), x, y);
}
bool CanvasRenderingContext2DBase::isPointInPathInternal(const Path& path, float x, float y, CanvasFillRule windingRule)
{
auto* c = drawingContext();
if (!c)
return false;
if (!state().hasInvertibleTransform)
return false;
auto transformedPoint = state().transform.inverse().valueOr(AffineTransform()).mapPoint(FloatPoint(x, y));
if (!std::isfinite(transformedPoint.x()) || !std::isfinite(transformedPoint.y()))
return false;
return path.contains(transformedPoint, toWindRule(windingRule));
}
bool CanvasRenderingContext2DBase::isPointInStrokeInternal(const Path& path, float x, float y)
{
auto* c = drawingContext();
if (!c)
return false;
if (!state().hasInvertibleTransform)
return false;
auto transformedPoint = state().transform.inverse().valueOr(AffineTransform()).mapPoint(FloatPoint(x, y));
if (!std::isfinite(transformedPoint.x()) || !std::isfinite(transformedPoint.y()))
return false;
CanvasStrokeStyleApplier applier(this);
return path.strokeContains(&applier, transformedPoint);
}
void CanvasRenderingContext2DBase::clearRect(float x, float y, float width, float height)
{
if (!validateRectForCanvas(x, y, width, height))
return;
auto* context = drawingContext();
if (!context)
return;
if (!state().hasInvertibleTransform)
return;
FloatRect rect(x, y, width, height);
bool saved = false;
if (shouldDrawShadows()) {
context->save();
saved = true;
context->setLegacyShadow(FloatSize(), 0, Color::transparent);
}
if (state().globalAlpha != 1) {
if (!saved) {
context->save();
saved = true;
}
context->setAlpha(1);
}
if (state().globalComposite != CompositeSourceOver) {
if (!saved) {
context->save();
saved = true;
}
context->setCompositeOperation(CompositeSourceOver);
}
context->clearRect(rect);
if (saved)
context->restore();
didDraw(rect);
}
void CanvasRenderingContext2DBase::fillRect(float x, float y, float width, float height)
{
if (!validateRectForCanvas(x, y, width, height))
return;
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
// from the HTML5 Canvas spec:
// If x0 = x1 and y0 = y1, then the linear gradient must paint nothing
// If x0 = x1 and y0 = y1 and r0 = r1, then the radial gradient must paint nothing
auto gradient = c->fillGradient();
if (gradient && gradient->isZeroSize())
return;
FloatRect rect(x, y, width, height);
if (rectContainsCanvas(rect)) {
c->fillRect(rect);
didDrawEntireCanvas();
} else if (isFullCanvasCompositeMode(state().globalComposite)) {
beginCompositeLayer();
c->fillRect(rect);
endCompositeLayer();
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
clearCanvas();
c->fillRect(rect);
didDrawEntireCanvas();
} else {
c->fillRect(rect);
didDraw(rect);
}
}
void CanvasRenderingContext2DBase::strokeRect(float x, float y, float width, float height)
{
if (!validateRectForCanvas(x, y, width, height))
return;
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
if (!(state().lineWidth >= 0))
return;
// If gradient size is zero, then paint nothing.
auto gradient = c->strokeGradient();
if (gradient && gradient->isZeroSize())
return;
FloatRect rect(x, y, width, height);
if (isFullCanvasCompositeMode(state().globalComposite)) {
beginCompositeLayer();
c->strokeRect(rect, state().lineWidth);
endCompositeLayer();
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
clearCanvas();
c->strokeRect(rect, state().lineWidth);
didDrawEntireCanvas();
} else {
FloatRect boundingRect = rect;
boundingRect.inflate(state().lineWidth / 2);
c->strokeRect(rect, state().lineWidth);
didDraw(boundingRect);
}
}
void CanvasRenderingContext2DBase::setShadow(float width, float height, float blur, const String& colorString, Optional<float> alpha)
{
Color color = Color::transparent;
if (!colorString.isNull()) {
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
color = parseColorOrCurrentColor(colorString, &canvas);
if (!color.isValid())
return;
}
// FIXME: Should not use RGBA32 here.
setShadow(FloatSize(width, height), blur, colorWithOverrideAlpha(color.rgb(), alpha));
}
void CanvasRenderingContext2DBase::setShadow(float width, float height, float blur, float grayLevel, float alpha)
{
setShadow(FloatSize(width, height), blur, Color(grayLevel, grayLevel, grayLevel, alpha));
}
void CanvasRenderingContext2DBase::setShadow(float width, float height, float blur, float r, float g, float b, float a)
{
setShadow(FloatSize(width, height), blur, Color(r, g, b, a));
}
void CanvasRenderingContext2DBase::setShadow(float width, float height, float blur, float c, float m, float y, float k, float a)
{
setShadow(FloatSize(width, height), blur, Color(c, m, y, k, a));
}
void CanvasRenderingContext2DBase::clearShadow()
{
setShadow(FloatSize(), 0, Color::transparent);
}
void CanvasRenderingContext2DBase::setShadow(const FloatSize& offset, float blur, const Color& color)
{
if (state().shadowOffset == offset && state().shadowBlur == blur && state().shadowColor == color)
return;
bool wasDrawingShadows = shouldDrawShadows();
realizeSaves();
modifiableState().shadowOffset = offset;
modifiableState().shadowBlur = blur;
modifiableState().shadowColor = color;
if (!wasDrawingShadows && !shouldDrawShadows())
return;
applyShadow();
}
void CanvasRenderingContext2DBase::applyShadow()
{
auto* c = drawingContext();
if (!c)
return;
if (shouldDrawShadows()) {
float width = state().shadowOffset.width();
float height = state().shadowOffset.height();
c->setLegacyShadow(FloatSize(width, -height), state().shadowBlur, state().shadowColor);
} else
c->setLegacyShadow(FloatSize(), 0, Color::transparent);
}
bool CanvasRenderingContext2DBase::shouldDrawShadows() const
{
return state().shadowColor.isVisible() && (state().shadowBlur || !state().shadowOffset.isZero());
}
enum class ImageSizeType { AfterDevicePixelRatio, BeforeDevicePixelRatio };
static LayoutSize size(HTMLImageElement& element, ImageSizeType sizeType = ImageSizeType::BeforeDevicePixelRatio)
{
LayoutSize size;
if (auto* cachedImage = element.cachedImage()) {
size = cachedImage->imageSizeForRenderer(element.renderer(), 1.0f); // FIXME: Not sure about this.
if (sizeType == ImageSizeType::AfterDevicePixelRatio && is<RenderImage>(element.renderer()) && cachedImage->image() && !cachedImage->image()->hasRelativeWidth())
size.scale(downcast<RenderImage>(*element.renderer()).imageDevicePixelRatio());
}
return size;
}
static inline FloatSize size(HTMLCanvasElement& canvasElement)
{
return canvasElement.size();
}
static inline FloatSize size(ImageBitmap& imageBitmap)
{
return FloatSize { static_cast<float>(imageBitmap.width()), static_cast<float>(imageBitmap.height()) };
}
#if ENABLE(VIDEO)
static inline FloatSize size(HTMLVideoElement& video)
{
auto player = video.player();
if (!player)
return { };
return player->naturalSize();
}
#endif
#if ENABLE(CSS_TYPED_OM)
static inline FloatSize size(TypedOMCSSImageValue& image)
{
auto* cachedImage = image.image();
if (!cachedImage)
return FloatSize();
return cachedImage->imageSizeForRenderer(nullptr, 1.0f);
}
#endif
static inline FloatRect normalizeRect(const FloatRect& rect)
{
return FloatRect(std::min(rect.x(), rect.maxX()),
std::min(rect.y(), rect.maxY()),
std::max(rect.width(), -rect.width()),
std::max(rect.height(), -rect.height()));
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(CanvasImageSource&& image, float dx, float dy)
{
return WTF::switchOn(image,
[&] (RefPtr<HTMLImageElement>& imageElement) -> ExceptionOr<void> {
LayoutSize destRectSize = size(*imageElement, ImageSizeType::AfterDevicePixelRatio);
LayoutSize sourceRectSize = size(*imageElement, ImageSizeType::BeforeDevicePixelRatio);
return this->drawImage(*imageElement, FloatRect { 0, 0, sourceRectSize.width(), sourceRectSize.height() }, FloatRect { dx, dy, destRectSize.width(), destRectSize.height() });
},
[&] (auto& element) -> ExceptionOr<void> {
FloatSize elementSize = size(*element);
return this->drawImage(*element, FloatRect { 0, 0, elementSize.width(), elementSize.height() }, FloatRect { dx, dy, elementSize.width(), elementSize.height() });
}
);
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(CanvasImageSource&& image, float dx, float dy, float dw, float dh)
{
return WTF::switchOn(image,
[&] (auto& element) -> ExceptionOr<void> {
FloatSize elementSize = size(*element);
return this->drawImage(*element, FloatRect { 0, 0, elementSize.width(), elementSize.height() }, FloatRect { dx, dy, dw, dh });
}
);
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(CanvasImageSource&& image, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh)
{
return WTF::switchOn(image,
[&] (auto& element) -> ExceptionOr<void> {
return this->drawImage(*element, FloatRect { sx, sy, sw, sh }, FloatRect { dx, dy, dw, dh });
}
);
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(HTMLImageElement& imageElement, const FloatRect& srcRect, const FloatRect& dstRect)
{
return drawImage(imageElement, srcRect, dstRect, state().globalComposite, state().globalBlend);
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(HTMLImageElement& imageElement, const FloatRect& srcRect, const FloatRect& dstRect, const CompositeOperator& op, const BlendMode& blendMode)
{
if (!imageElement.complete())
return { };
FloatRect imageRect = FloatRect(FloatPoint(), size(imageElement, ImageSizeType::BeforeDevicePixelRatio));
auto result = drawImage(imageElement.document(), imageElement.cachedImage(), imageElement.renderer(), imageRect, srcRect, dstRect, op, blendMode);
if (!result.hasException())
checkOrigin(&imageElement);
return result;
}
#if ENABLE(CSS_TYPED_OM)
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(TypedOMCSSImageValue& image, const FloatRect& srcRect, const FloatRect& dstRect)
{
auto* cachedImage = image.image();
if (!cachedImage || !image.document())
return { };
FloatRect imageRect = FloatRect(FloatPoint(), size(image));
auto result = drawImage(*image.document(), cachedImage, nullptr, imageRect, srcRect, dstRect, state().globalComposite, state().globalBlend);
if (!result.hasException())
checkOrigin(image);
return result;
}
#endif
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(Document& document, CachedImage* cachedImage, const RenderObject* renderer, const FloatRect& imageRect, const FloatRect& srcRect, const FloatRect& dstRect, const CompositeOperator& op, const BlendMode& blendMode)
{
if (!std::isfinite(dstRect.x()) || !std::isfinite(dstRect.y()) || !std::isfinite(dstRect.width()) || !std::isfinite(dstRect.height())
|| !std::isfinite(srcRect.x()) || !std::isfinite(srcRect.y()) || !std::isfinite(srcRect.width()) || !std::isfinite(srcRect.height()))
return { };
if (!dstRect.width() || !dstRect.height())
return { };
FloatRect normalizedSrcRect = normalizeRect(srcRect);
FloatRect normalizedDstRect = normalizeRect(dstRect);
if (!srcRect.width() || !srcRect.height())
return Exception { IndexSizeError };
// When the source rectangle is outside the source image, the source rectangle must be clipped
// to the source image and the destination rectangle must be clipped in the same proportion.
FloatRect originalNormalizedSrcRect = normalizedSrcRect;
normalizedSrcRect.intersect(imageRect);
if (normalizedSrcRect.isEmpty())
return { };
if (normalizedSrcRect != originalNormalizedSrcRect) {
normalizedDstRect.setWidth(normalizedDstRect.width() * normalizedSrcRect.width() / originalNormalizedSrcRect.width());
normalizedDstRect.setHeight(normalizedDstRect.height() * normalizedSrcRect.height() / originalNormalizedSrcRect.height());
if (normalizedDstRect.isEmpty())
return { };
}
GraphicsContext* c = drawingContext();
if (!c)
return { };
if (!state().hasInvertibleTransform)
return { };
if (!cachedImage)
return { };
RefPtr<Image> image = cachedImage->imageForRenderer(renderer);
if (!image)
return { };
ImageObserver* observer = image->imageObserver();
if (image->isSVGImage()) {
image->setImageObserver(nullptr);
image->setContainerSize(imageRect.size());
}
if (image->isBitmapImage())
downcast<BitmapImage>(*image).updateFromSettings(document.settings());
if (rectContainsCanvas(normalizedDstRect)) {
c->drawImage(*image, normalizedDstRect, normalizedSrcRect, ImagePaintingOptions(op, blendMode));
didDrawEntireCanvas();
} else if (isFullCanvasCompositeMode(op)) {
fullCanvasCompositedDrawImage(*image, normalizedDstRect, normalizedSrcRect, op);
didDrawEntireCanvas();
} else if (op == CompositeCopy) {
clearCanvas();
c->drawImage(*image, normalizedDstRect, normalizedSrcRect, ImagePaintingOptions(op, blendMode));
didDrawEntireCanvas();
} else {
c->drawImage(*image, normalizedDstRect, normalizedSrcRect, ImagePaintingOptions(op, blendMode));
didDraw(normalizedDstRect);
}
if (image->isSVGImage())
image->setImageObserver(observer);
return { };
}
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(HTMLCanvasElement& sourceCanvas, const FloatRect& srcRect, const FloatRect& dstRect)
{
FloatRect srcCanvasRect = FloatRect(FloatPoint(), sourceCanvas.size());
if (!srcCanvasRect.width() || !srcCanvasRect.height())
return Exception { InvalidStateError };
if (!srcRect.width() || !srcRect.height())
return Exception { IndexSizeError };
if (!srcCanvasRect.contains(normalizeRect(srcRect)) || !dstRect.width() || !dstRect.height())
return { };
GraphicsContext* c = drawingContext();
if (!c)
return { };
if (!state().hasInvertibleTransform)
return { };
// FIXME: Do this through platform-independent GraphicsContext API.
ImageBuffer* buffer = sourceCanvas.buffer();
if (!buffer)
return { };
checkOrigin(&sourceCanvas);
#if ENABLE(ACCELERATED_2D_CANVAS)
// If we're drawing from one accelerated canvas 2d to another, avoid calling sourceCanvas.makeRenderingResultsAvailable()
// as that will do a readback to software.
RefPtr<CanvasRenderingContext> sourceContext = sourceCanvas.renderingContext();
// FIXME: Implement an accelerated path for drawing from a WebGL canvas to a 2d canvas when possible.
if (!isAccelerated() || !sourceContext || !sourceContext->isAccelerated() || !sourceContext->is2d())
sourceCanvas.makeRenderingResultsAvailable();
#else
sourceCanvas.makeRenderingResultsAvailable();
#endif
if (rectContainsCanvas(dstRect)) {
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
didDrawEntireCanvas();
} else if (isFullCanvasCompositeMode(state().globalComposite)) {
fullCanvasCompositedDrawImage(*buffer, dstRect, srcRect, state().globalComposite);
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
if (&sourceCanvas == &canvasBase()) {
if (auto copy = buffer->copyRectToBuffer(srcRect, ColorSpaceSRGB, *c)) {
clearCanvas();
c->drawImageBuffer(*copy, dstRect, { { }, srcRect.size() }, ImagePaintingOptions(state().globalComposite, state().globalBlend));
}
} else {
clearCanvas();
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
}
didDrawEntireCanvas();
} else {
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
didDraw(dstRect);
}
return { };
}
#if ENABLE(VIDEO)
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(HTMLVideoElement& video, const FloatRect& srcRect, const FloatRect& dstRect)
{
if (video.readyState() == HTMLMediaElement::HAVE_NOTHING || video.readyState() == HTMLMediaElement::HAVE_METADATA)
return { };
FloatRect videoRect = FloatRect(FloatPoint(), size(video));
if (!srcRect.width() || !srcRect.height())
return Exception { IndexSizeError };
if (!videoRect.contains(normalizeRect(srcRect)) || !dstRect.width() || !dstRect.height())
return { };
GraphicsContext* c = drawingContext();
if (!c)
return { };
if (!state().hasInvertibleTransform)
return { };
checkOrigin(&video);
#if USE(CG) || (ENABLE(ACCELERATED_2D_CANVAS) && USE(GSTREAMER_GL) && USE(CAIRO))
if (NativeImagePtr image = video.nativeImageForCurrentTime()) {
c->drawNativeImage(image, FloatSize(video.videoWidth(), video.videoHeight()), dstRect, srcRect);
if (rectContainsCanvas(dstRect))
didDrawEntireCanvas();
else
didDraw(dstRect);
return { };
}
#endif
GraphicsContextStateSaver stateSaver(*c);
c->clip(dstRect);
c->translate(dstRect.location());
c->scale(FloatSize(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height()));
c->translate(-srcRect.location());
video.paintCurrentFrameInContext(*c, FloatRect(FloatPoint(), size(video)));
stateSaver.restore();
didDraw(dstRect);
return { };
}
#endif
ExceptionOr<void> CanvasRenderingContext2DBase::drawImage(ImageBitmap& imageBitmap, const FloatRect& srcRect, const FloatRect& dstRect)
{
if (!imageBitmap.width() || !imageBitmap.height())
return Exception { InvalidStateError };
if (!srcRect.width() || !srcRect.height())
return Exception { IndexSizeError };
FloatRect srcBitmapRect = FloatRect(FloatPoint(), FloatSize(imageBitmap.width(), imageBitmap.height()));
if (!srcBitmapRect.contains(normalizeRect(srcRect)) || !dstRect.width() || !dstRect.height())
return { };
GraphicsContext* c = drawingContext();
if (!c)
return { };
if (!state().hasInvertibleTransform)
return { };
ImageBuffer* buffer = imageBitmap.buffer();
if (!buffer)
return { };
checkOrigin(&imageBitmap);
if (rectContainsCanvas(dstRect)) {
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
didDrawEntireCanvas();
} else if (isFullCanvasCompositeMode(state().globalComposite)) {
fullCanvasCompositedDrawImage(*buffer, dstRect, srcRect, state().globalComposite);
didDrawEntireCanvas();
} else if (state().globalComposite == CompositeCopy) {
clearCanvas();
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
didDrawEntireCanvas();
} else {
c->drawImageBuffer(*buffer, dstRect, srcRect, ImagePaintingOptions(state().globalComposite, state().globalBlend));
didDraw(dstRect);
}
return { };
}
void CanvasRenderingContext2DBase::drawImageFromRect(HTMLImageElement& imageElement, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, const String& compositeOperation)
{
CompositeOperator op;
auto blendOp = BlendMode::Normal;
if (!parseCompositeAndBlendOperator(compositeOperation, op, blendOp) || blendOp != BlendMode::Normal)
op = CompositeSourceOver;
drawImage(imageElement, FloatRect { sx, sy, sw, sh }, FloatRect { dx, dy, dw, dh }, op, BlendMode::Normal);
}
void CanvasRenderingContext2DBase::clearCanvas()
{
auto* c = drawingContext();
if (!c)
return;
c->save();
c->setCTM(canvasBase().baseTransform());
c->clearRect(FloatRect(0, 0, canvasBase().width(), canvasBase().height()));
c->restore();
}
Path CanvasRenderingContext2DBase::transformAreaToDevice(const Path& path) const
{
Path transformed(path);
transformed.transform(state().transform);
transformed.transform(canvasBase().baseTransform());
return transformed;
}
Path CanvasRenderingContext2DBase::transformAreaToDevice(const FloatRect& rect) const
{
Path path;
path.addRect(rect);
return transformAreaToDevice(path);
}
bool CanvasRenderingContext2DBase::rectContainsCanvas(const FloatRect& rect) const
{
FloatQuad quad(rect);
FloatQuad canvasQuad(FloatRect(0, 0, canvasBase().width(), canvasBase().height()));
return state().transform.mapQuad(quad).containsQuad(canvasQuad);
}
template<class T> IntRect CanvasRenderingContext2DBase::calculateCompositingBufferRect(const T& area, IntSize* croppedOffset)
{
IntRect canvasRect(0, 0, canvasBase().width(), canvasBase().height());
canvasRect = canvasBase().baseTransform().mapRect(canvasRect);
Path path = transformAreaToDevice(area);
IntRect bufferRect = enclosingIntRect(path.fastBoundingRect());
IntPoint originalLocation = bufferRect.location();
bufferRect.intersect(canvasRect);
if (croppedOffset)
*croppedOffset = originalLocation - bufferRect.location();
return bufferRect;
}
std::unique_ptr<ImageBuffer> CanvasRenderingContext2DBase::createCompositingBuffer(const IntRect& bufferRect)
{
return ImageBuffer::create(bufferRect.size(), isAccelerated() ? Accelerated : Unaccelerated);
}
void CanvasRenderingContext2DBase::compositeBuffer(ImageBuffer& buffer, const IntRect& bufferRect, CompositeOperator op)
{
IntRect canvasRect(0, 0, canvasBase().width(), canvasBase().height());
canvasRect = canvasBase().baseTransform().mapRect(canvasRect);
auto* c = drawingContext();
if (!c)
return;
c->save();
c->setCTM(AffineTransform());
c->setCompositeOperation(op);
c->save();
c->clipOut(bufferRect);
c->clearRect(canvasRect);
c->restore();
c->drawImageBuffer(buffer, bufferRect.location(), state().globalComposite);
c->restore();
}
static void drawImageToContext(Image& image, GraphicsContext& context, const FloatRect& dest, const FloatRect& src, CompositeOperator op)
{
context.drawImage(image, dest, src, op);
}
static void drawImageToContext(ImageBuffer& imageBuffer, GraphicsContext& context, const FloatRect& dest, const FloatRect& src, CompositeOperator op)
{
context.drawImageBuffer(imageBuffer, dest, src, op);
}
template<class T> void CanvasRenderingContext2DBase::fullCanvasCompositedDrawImage(T& image, const FloatRect& dest, const FloatRect& src, CompositeOperator op)
{
ASSERT(isFullCanvasCompositeMode(op));
IntSize croppedOffset;
auto bufferRect = calculateCompositingBufferRect(dest, &croppedOffset);
if (bufferRect.isEmpty()) {
clearCanvas();
return;
}
auto buffer = createCompositingBuffer(bufferRect);
if (!buffer)
return;
auto* c = drawingContext();
if (!c)
return;
FloatRect adjustedDest = dest;
adjustedDest.setLocation(FloatPoint(0, 0));
AffineTransform effectiveTransform = c->getCTM();
IntRect transformedAdjustedRect = enclosingIntRect(effectiveTransform.mapRect(adjustedDest));
buffer->context().translate(-transformedAdjustedRect.location());
buffer->context().translate(croppedOffset);
buffer->context().concatCTM(effectiveTransform);
drawImageToContext(image, buffer->context(), adjustedDest, src, CompositeSourceOver);
compositeBuffer(*buffer, bufferRect, op);
}
void CanvasRenderingContext2DBase::prepareGradientForDashboard(CanvasGradient& gradient) const
{
#if ENABLE(DASHBOARD_SUPPORT)
if (m_usesDashboardCompatibilityMode)
gradient.setDashboardCompatibilityMode();
#else
UNUSED_PARAM(gradient);
#endif
}
static CanvasRenderingContext2DBase::Style toStyle(const CanvasStyle& style)
{
if (auto gradient = style.canvasGradient())
return gradient;
if (auto pattern = style.canvasPattern())
return pattern;
return style.color();
}
CanvasRenderingContext2DBase::Style CanvasRenderingContext2DBase::strokeStyle() const
{
return toStyle(state().strokeStyle);
}
void CanvasRenderingContext2DBase::setStrokeStyle(CanvasRenderingContext2DBase::Style&& style)
{
WTF::switchOn(style,
[this] (const String& string) { this->setStrokeColor(string); },
[this] (const RefPtr<CanvasGradient>& gradient) { this->setStrokeStyle(CanvasStyle(*gradient)); },
[this] (const RefPtr<CanvasPattern>& pattern) { this->setStrokeStyle(CanvasStyle(*pattern)); }
);
}
CanvasRenderingContext2DBase::Style CanvasRenderingContext2DBase::fillStyle() const
{
return toStyle(state().fillStyle);
}
void CanvasRenderingContext2DBase::setFillStyle(CanvasRenderingContext2DBase::Style&& style)
{
WTF::switchOn(style,
[this] (const String& string) { this->setFillColor(string); },
[this] (const RefPtr<CanvasGradient>& gradient) { this->setFillStyle(CanvasStyle(*gradient)); },
[this] (const RefPtr<CanvasPattern>& pattern) { this->setFillStyle(CanvasStyle(*pattern)); }
);
}
ExceptionOr<Ref<CanvasGradient>> CanvasRenderingContext2DBase::createLinearGradient(float x0, float y0, float x1, float y1)
{
if (!std::isfinite(x0) || !std::isfinite(y0) || !std::isfinite(x1) || !std::isfinite(y1))
return Exception { NotSupportedError };
auto gradient = CanvasGradient::create(FloatPoint(x0, y0), FloatPoint(x1, y1));
prepareGradientForDashboard(gradient.get());
return gradient;
}
ExceptionOr<Ref<CanvasGradient>> CanvasRenderingContext2DBase::createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1)
{
if (!std::isfinite(x0) || !std::isfinite(y0) || !std::isfinite(r0) || !std::isfinite(x1) || !std::isfinite(y1) || !std::isfinite(r1))
return Exception { NotSupportedError };
if (r0 < 0 || r1 < 0)
return Exception { IndexSizeError };
auto gradient = CanvasGradient::create(FloatPoint(x0, y0), r0, FloatPoint(x1, y1), r1);
prepareGradientForDashboard(gradient.get());
return gradient;
}
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(CanvasImageSource&& image, const String& repetition)
{
bool repeatX, repeatY;
if (!CanvasPattern::parseRepetitionType(repetition, repeatX, repeatY))
return Exception { SyntaxError };
return WTF::switchOn(image,
[&] (auto& element) -> ExceptionOr<RefPtr<CanvasPattern>> { return this->createPattern(*element, repeatX, repeatY); }
);
}
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(HTMLImageElement& imageElement, bool repeatX, bool repeatY)
{
auto* cachedImage = imageElement.cachedImage();
// If the image loading hasn't started or the image is not complete, it is not fully decodable.
if (!cachedImage || !imageElement.complete())
return nullptr;
if (cachedImage->status() == CachedResource::LoadError)
return Exception { InvalidStateError };
bool originClean = cachedImage->isOriginClean(canvasBase().securityOrigin());
// FIXME: SVG images with animations can switch between clean and dirty (leaking cross-origin
// data). We should either:
// 1) Take a fixed snapshot of an SVG image when creating a pattern and determine then whether
// the origin is clean.
// 2) Dynamically verify the origin checks at draw time, and dirty the canvas accordingly.
// To be on the safe side, taint the origin for all patterns containing SVG images for now.
if (cachedImage->image()->isSVGImage())
originClean = false;
return RefPtr<CanvasPattern> { CanvasPattern::create(*cachedImage->imageForRenderer(imageElement.renderer()), repeatX, repeatY, originClean) };
}
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(CanvasBase& canvas, bool repeatX, bool repeatY)
{
if (!canvas.width() || !canvas.height())
return Exception { InvalidStateError };
auto* copiedImage = canvas.copiedImage();
if (!copiedImage)
return Exception { InvalidStateError };
return RefPtr<CanvasPattern> { CanvasPattern::create(*copiedImage, repeatX, repeatY, canvas.originClean()) };
}
#if ENABLE(VIDEO)
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(HTMLVideoElement& videoElement, bool repeatX, bool repeatY)
{
if (videoElement.readyState() < HTMLMediaElement::HAVE_CURRENT_DATA)
return nullptr;
checkOrigin(&videoElement);
bool originClean = canvasBase().originClean();
#if USE(CG) || (ENABLE(ACCELERATED_2D_CANVAS) && USE(GSTREAMER_GL) && USE(CAIRO))
if (auto nativeImage = videoElement.nativeImageForCurrentTime())
return RefPtr<CanvasPattern> { CanvasPattern::create(BitmapImage::create(WTFMove(nativeImage)), repeatX, repeatY, originClean) };
#endif
auto imageBuffer = ImageBuffer::create(size(videoElement), drawingContext() ? drawingContext()->renderingMode() : Accelerated);
if (!imageBuffer)
return nullptr;
videoElement.paintCurrentFrameInContext(imageBuffer->context(), FloatRect(FloatPoint(), size(videoElement)));
return RefPtr<CanvasPattern> { CanvasPattern::create(ImageBuffer::sinkIntoImage(WTFMove(imageBuffer), PreserveResolution::Yes).releaseNonNull(), repeatX, repeatY, originClean) };
}
#endif
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(ImageBitmap&, bool, bool)
{
// FIXME: Implement.
return Exception { TypeError };
}
#if ENABLE(CSS_TYPED_OM)
ExceptionOr<RefPtr<CanvasPattern>> CanvasRenderingContext2DBase::createPattern(TypedOMCSSImageValue&, bool, bool)
{
// FIXME: Implement.
return Exception { TypeError };
}
#endif
void CanvasRenderingContext2DBase::didDrawEntireCanvas()
{
didDraw(FloatRect(FloatPoint::zero(), canvasBase().size()), CanvasDidDrawApplyClip);
}
void CanvasRenderingContext2DBase::didDraw(const FloatRect& r, unsigned options)
{
auto* c = drawingContext();
if (!c)
return;
if (!state().hasInvertibleTransform)
return;
#if ENABLE(ACCELERATED_2D_CANVAS)
// If we are drawing to hardware and we have a composited layer, just call contentChanged().
if (isAccelerated()) {
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
RenderBox* renderBox = canvas.renderBox();
if (renderBox && renderBox->hasAcceleratedCompositing()) {
renderBox->contentChanged(CanvasPixelsChanged);
canvas.clearCopiedImage();
canvas.notifyObserversCanvasChanged(r);
return;
}
}
#endif
FloatRect dirtyRect = r;
if (options & CanvasDidDrawApplyTransform) {
AffineTransform ctm = state().transform;
dirtyRect = ctm.mapRect(r);
}
if (options & CanvasDidDrawApplyShadow && state().shadowColor.isVisible()) {
// The shadow gets applied after transformation
FloatRect shadowRect(dirtyRect);
shadowRect.move(state().shadowOffset);
shadowRect.inflate(state().shadowBlur);
dirtyRect.unite(shadowRect);
}
if (options & CanvasDidDrawApplyClip) {
// FIXME: apply the current clip to the rectangle. Unfortunately we can't get the clip
// back out of the GraphicsContext, so to take clip into account for incremental painting,
// we'd have to keep the clip path around.
}
canvasBase().didDraw(dirtyRect);
}
void CanvasRenderingContext2DBase::setTracksDisplayListReplay(bool tracksDisplayListReplay)
{
if (tracksDisplayListReplay == m_tracksDisplayListReplay)
return;
m_tracksDisplayListReplay = tracksDisplayListReplay;
if (!m_tracksDisplayListReplay)
contextDisplayListMap().remove(this);
}
String CanvasRenderingContext2DBase::displayListAsText(DisplayList::AsTextFlags flags) const
{
if (!m_recordingContext)
return { };
return m_recordingContext->displayList.asText(flags);
}
String CanvasRenderingContext2DBase::replayDisplayListAsText(DisplayList::AsTextFlags flags) const
{
auto* displayList = contextDisplayListMap().get(this);
if (!displayList)
return { };
return displayList->asText(flags);
}
const Vector<CanvasRenderingContext2DBase::State, 1>& CanvasRenderingContext2DBase::stateStack()
{
realizeSaves();
return m_stateStack;
}
void CanvasRenderingContext2DBase::paintRenderingResultsToCanvas()
{
if (UNLIKELY(m_usesDisplayListDrawing)) {
if (!m_recordingContext)
return;
FloatRect clip(FloatPoint::zero(), canvasBase().size());
DisplayList::Replayer replayer(*canvasBase().drawingContext(), m_recordingContext->displayList);
if (UNLIKELY(m_tracksDisplayListReplay)) {
auto replayList = replayer.replay(clip, m_tracksDisplayListReplay);
contextDisplayListMap().add(this, WTFMove(replayList));
} else
replayer.replay(clip);
m_recordingContext->displayList.clear();
}
}
GraphicsContext* CanvasRenderingContext2DBase::drawingContext() const
{
if (UNLIKELY(m_usesDisplayListDrawing)) {
if (!m_recordingContext)
m_recordingContext = std::make_unique<DisplayListDrawingContext>(GraphicsContextState(), FloatRect(FloatPoint::zero(), canvasBase().size()));
return &m_recordingContext->context;
}
return canvasBase().drawingContext();
}
static RefPtr<ImageData> createEmptyImageData(const IntSize& size)
{
auto data = ImageData::create(size);
if (data)
data->data()->zeroFill();
return data;
}
RefPtr<ImageData> CanvasRenderingContext2DBase::createImageData(ImageData& imageData) const
{
return createEmptyImageData(imageData.size());
}
ExceptionOr<RefPtr<ImageData>> CanvasRenderingContext2DBase::createImageData(float sw, float sh) const
{
if (!sw || !sh)
return Exception { IndexSizeError };
FloatSize logicalSize(std::abs(sw), std::abs(sh));
if (!logicalSize.isExpressibleAsIntSize())
return nullptr;
IntSize size = expandedIntSize(logicalSize);
if (size.width() < 1)
size.setWidth(1);
if (size.height() < 1)
size.setHeight(1);
return createEmptyImageData(size);
}
ExceptionOr<RefPtr<ImageData>> CanvasRenderingContext2DBase::getImageData(float sx, float sy, float sw, float sh) const
{
return getImageData(ImageBuffer::LogicalCoordinateSystem, sx, sy, sw, sh);
}
ExceptionOr<RefPtr<ImageData>> CanvasRenderingContext2DBase::getImageData(ImageBuffer::CoordinateSystem coordinateSystem, float sx, float sy, float sw, float sh) const
{
if (!canvasBase().originClean()) {
static NeverDestroyed<String> consoleMessage(MAKE_STATIC_STRING_IMPL("Unable to get image data from canvas because the canvas has been tainted by cross-origin data."));
canvasBase().scriptExecutionContext()->addConsoleMessage(MessageSource::Security, MessageLevel::Error, consoleMessage);
return Exception { SecurityError };
}
if (!sw || !sh)
return Exception { IndexSizeError };
if (sw < 0) {
sx += sw;
sw = -sw;
}
if (sh < 0) {
sy += sh;
sh = -sh;
}
FloatRect logicalRect(sx, sy, sw, sh);
if (logicalRect.width() < 1)
logicalRect.setWidth(1);
if (logicalRect.height() < 1)
logicalRect.setHeight(1);
if (!logicalRect.isExpressibleAsIntRect())
return nullptr;
IntRect imageDataRect = enclosingIntRect(logicalRect);
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
ImageBuffer* buffer = canvas.buffer();
if (!buffer)
return createEmptyImageData(imageDataRect.size());
auto byteArray = buffer->getUnmultipliedImageData(imageDataRect, nullptr, coordinateSystem);
if (!byteArray) {
StringBuilder consoleMessage;
consoleMessage.appendLiteral("Unable to get image data from canvas. Requested size was ");
consoleMessage.appendNumber(imageDataRect.width());
consoleMessage.appendLiteral(" x ");
consoleMessage.appendNumber(imageDataRect.height());
canvasBase().scriptExecutionContext()->addConsoleMessage(MessageSource::Rendering, MessageLevel::Error, consoleMessage.toString());
return Exception { InvalidStateError };
}
return ImageData::create(imageDataRect.size(), byteArray.releaseNonNull());
}
void CanvasRenderingContext2DBase::putImageData(ImageData& data, float dx, float dy)
{
putImageData(data, dx, dy, 0, 0, data.width(), data.height());
}
void CanvasRenderingContext2DBase::putImageData(ImageData& data, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight)
{
putImageData(data, ImageBuffer::LogicalCoordinateSystem, dx, dy, dirtyX, dirtyY, dirtyWidth, dirtyHeight);
}
void CanvasRenderingContext2DBase::putImageData(ImageData& data, ImageBuffer::CoordinateSystem coordinateSystem, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight)
{
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
ImageBuffer* buffer = canvas.buffer();
if (!buffer)
return;
if (!data.data())
return;
if (dirtyWidth < 0) {
dirtyX += dirtyWidth;
dirtyWidth = -dirtyWidth;
}
if (dirtyHeight < 0) {
dirtyY += dirtyHeight;
dirtyHeight = -dirtyHeight;
}
FloatRect clipRect(dirtyX, dirtyY, dirtyWidth, dirtyHeight);
clipRect.intersect(IntRect(0, 0, data.width(), data.height()));
IntSize destOffset(static_cast<int>(dx), static_cast<int>(dy));
IntRect destRect = enclosingIntRect(clipRect);
destRect.move(destOffset);
destRect.intersect(IntRect(IntPoint(), coordinateSystem == ImageBuffer::LogicalCoordinateSystem ? buffer->logicalSize() : buffer->internalSize()));
if (destRect.isEmpty())
return;
IntRect sourceRect(destRect);
sourceRect.move(-destOffset);
sourceRect.intersect(IntRect(0, 0, data.width(), data.height()));
if (!sourceRect.isEmpty())
buffer->putByteArray(*data.data(), AlphaPremultiplication::Unpremultiplied, IntSize(data.width(), data.height()), sourceRect, IntPoint(destOffset), coordinateSystem);
didDraw(destRect, CanvasDidDrawApplyNone); // ignore transform, shadow and clip
}
void CanvasRenderingContext2DBase::inflateStrokeRect(FloatRect& rect) const
{
// Fast approximation of the stroke's bounding rect.
// This yields a slightly oversized rect but is very fast
// compared to Path::strokeBoundingRect().
static const float root2 = sqrtf(2);
float delta = state().lineWidth / 2;
if (state().lineJoin == MiterJoin)
delta *= state().miterLimit;
else if (state().lineCap == SquareCap)
delta *= root2;
rect.inflate(delta);
}
#if ENABLE(ACCELERATED_2D_CANVAS)
PlatformLayer* CanvasRenderingContext2DBase::platformLayer() const
{
auto& canvas = downcast<HTMLCanvasElement>(canvasBase());
return canvas.buffer() ? canvas.buffer()->platformLayer() : nullptr;
}
#endif
static inline InterpolationQuality smoothingToInterpolationQuality(ImageSmoothingQuality quality)
{
switch (quality) {
case ImageSmoothingQuality::Low:
return InterpolationLow;
case ImageSmoothingQuality::Medium:
return InterpolationMedium;
case ImageSmoothingQuality::High:
return InterpolationHigh;
}
ASSERT_NOT_REACHED();
return InterpolationLow;
};
auto CanvasRenderingContext2DBase::imageSmoothingQuality() const -> ImageSmoothingQuality
{
return state().imageSmoothingQuality;
}
void CanvasRenderingContext2DBase::setImageSmoothingQuality(ImageSmoothingQuality quality)
{
if (quality == state().imageSmoothingQuality)
return;
realizeSaves();
modifiableState().imageSmoothingQuality = quality;
if (!state().imageSmoothingEnabled)
return;
if (auto* context = drawingContext())
context->setImageInterpolationQuality(smoothingToInterpolationQuality(quality));
}
bool CanvasRenderingContext2DBase::imageSmoothingEnabled() const
{
return state().imageSmoothingEnabled;
}
void CanvasRenderingContext2DBase::setImageSmoothingEnabled(bool enabled)
{
if (enabled == state().imageSmoothingEnabled)
return;
realizeSaves();
modifiableState().imageSmoothingEnabled = enabled;
auto* c = drawingContext();
if (c)
c->setImageInterpolationQuality(enabled ? smoothingToInterpolationQuality(state().imageSmoothingQuality) : InterpolationNone);
}
void CanvasRenderingContext2DBase::setPath(Path2D& path)
{
m_path = path.path();
}
Ref<Path2D> CanvasRenderingContext2DBase::getPath() const
{
return Path2D::create(m_path);
}
inline void CanvasRenderingContext2DBase::clearPathForDashboardBackwardCompatibilityMode()
{
#if ENABLE(DASHBOARD_SUPPORT)
if (m_usesDashboardCompatibilityMode)
m_path.clear();
#endif
}
} // namespace WebCore