third_party/WebKit/WebCore/html/CanvasRenderingContext2D.cpp - Issue 21152: WebKit merge 40668:40722 part 1.

Unified Diff: third_party/WebKit/WebCore/html/CanvasRenderingContext2D.cpp

Issue 21152: WebKit merge 40668:40722 part 1. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/

Patch Set: Created 11 years, 10 months ago

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Index: third_party/WebKit/WebCore/html/CanvasRenderingContext2D.cpp

===================================================================

--- third_party/WebKit/WebCore/html/CanvasRenderingContext2D.cpp (revision 9310)

+++ third_party/WebKit/WebCore/html/CanvasRenderingContext2D.cpp (working copy)

@@ -1,1460 +1,1461 @@

-/*

- *

- * 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 COMPUTER, 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 COMPUTER, 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 "CanvasRenderingContext2D.h"

-#include "TransformationMatrix.h"

-#include "CSSParser.h"

-#include "CachedImage.h"

-#include "CanvasGradient.h"

-#include "CanvasPattern.h"

-#include "CanvasStyle.h"

-#include "CSSPropertyNames.h"

-#include "CSSStyleSelector.h"

-#include "Document.h"

-#include "ExceptionCode.h"

-#include "FloatConversion.h"

-#include "Frame.h"

-#include "GraphicsContext.h"

-#include "HTMLCanvasElement.h"

-#include "HTMLImageElement.h"

-#include "HTMLNames.h"

-#include "ImageBuffer.h"

-#include "ImageData.h"

-#include "KURL.h"

-#include "NotImplemented.h"

-#include "Page.h"

-#include "RenderHTMLCanvas.h"

-#include "SecurityOrigin.h"

-#include "Settings.h"

-#include "StrokeStyleApplier.h"

-#include "TextMetrics.h"

-#include <stdio.h>

-#include <wtf/ByteArray.h>

-#include <wtf/MathExtras.h>

-using namespace std;

-namespace WebCore {

-using namespace HTMLNames;

-static const char* const defaultFont = "10px sans-serif";

-class CanvasStrokeStyleApplier : public StrokeStyleApplier {

-public:

- CanvasStrokeStyleApplier(CanvasRenderingContext2D* canvasContext)

- : m_canvasContext(canvasContext)

- {

- }

- virtual void strokeStyle(GraphicsContext* c)

- {

- c->setStrokeThickness(m_canvasContext->lineWidth());

- c->setLineCap(m_canvasContext->getLineCap());

- c->setLineJoin(m_canvasContext->getLineJoin());

- c->setMiterLimit(m_canvasContext->miterLimit());

- }

-private:

- CanvasRenderingContext2D* m_canvasContext;

-};

-CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas)

- : m_canvas(canvas)

- , m_stateStack(1)

-void CanvasRenderingContext2D::ref()

- m_canvas->ref();

-void CanvasRenderingContext2D::deref()

- m_canvas->deref();

-void CanvasRenderingContext2D::reset()

- m_stateStack.resize(1);

- m_stateStack.first() = State();

-CanvasRenderingContext2D::State::State()

- : m_strokeStyle(CanvasStyle::create("black"))

- , m_fillStyle(CanvasStyle::create("black"))

- , m_lineWidth(1)

- , m_lineCap(ButtCap)

- , m_lineJoin(MiterJoin)

- , m_miterLimit(10)

- , m_shadowBlur(0)

- , m_shadowColor("black")

- , m_globalAlpha(1)

- , m_globalComposite(CompositeSourceOver)

- , m_invertibleCTM(true)

- , m_textAlign(StartTextAlign)

- , m_textBaseline(AlphabeticTextBaseline)

- , m_unparsedFont(defaultFont)

- , m_realizedFont(false)

-void CanvasRenderingContext2D::save()

- ASSERT(m_stateStack.size() >= 1);

- m_stateStack.append(state());

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->save();

-void CanvasRenderingContext2D::restore()

- ASSERT(m_stateStack.size() >= 1);

- if (m_stateStack.size() <= 1)

- return;

- m_path.transform(state().m_transform);

- m_stateStack.removeLast();

- m_path.transform(state().m_transform.inverse());

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->restore();

-CanvasStyle* CanvasRenderingContext2D::strokeStyle() const

- return state().m_strokeStyle.get();

-void CanvasRenderingContext2D::setStrokeStyle(PassRefPtr<CanvasStyle> style)

- if (!style)

- return;

- if (m_canvas->originClean()) {

- if (CanvasPattern* pattern = style->canvasPattern()) {

- if (!pattern->originClean())

- m_canvas->setOriginTainted();

- }

- state().m_strokeStyle = style;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- state().m_strokeStyle->applyStrokeColor(c);

-CanvasStyle* CanvasRenderingContext2D::fillStyle() const

- return state().m_fillStyle.get();

-void CanvasRenderingContext2D::setFillStyle(PassRefPtr<CanvasStyle> style)

- if (!style)

- return;

- if (m_canvas->originClean()) {

- if (CanvasPattern* pattern = style->canvasPattern()) {

- if (!pattern->originClean())

- m_canvas->setOriginTainted();

- }

- state().m_fillStyle = style;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- state().m_fillStyle->applyFillColor(c);

-float CanvasRenderingContext2D::lineWidth() const

- return state().m_lineWidth;

-void CanvasRenderingContext2D::setLineWidth(float width)

- if (!(width > 0))

- return;

- state().m_lineWidth = width;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setStrokeThickness(width);

-String CanvasRenderingContext2D::lineCap() const

- return lineCapName(state().m_lineCap);

-void CanvasRenderingContext2D::setLineCap(const String& s)

- LineCap cap;

- if (!parseLineCap(s, cap))

- return;

- state().m_lineCap = cap;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setLineCap(cap);

-String CanvasRenderingContext2D::lineJoin() const

- return lineJoinName(state().m_lineJoin);

-void CanvasRenderingContext2D::setLineJoin(const String& s)

- LineJoin join;

- if (!parseLineJoin(s, join))

- return;

- state().m_lineJoin = join;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setLineJoin(join);

-float CanvasRenderingContext2D::miterLimit() const

- return state().m_miterLimit;

-void CanvasRenderingContext2D::setMiterLimit(float limit)

- if (!(limit > 0))

- return;

- state().m_miterLimit = limit;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setMiterLimit(limit);

-float CanvasRenderingContext2D::shadowOffsetX() const

- return state().m_shadowOffset.width();

-void CanvasRenderingContext2D::setShadowOffsetX(float x)

- state().m_shadowOffset.setWidth(x);

- applyShadow();

-float CanvasRenderingContext2D::shadowOffsetY() const

- return state().m_shadowOffset.height();

-void CanvasRenderingContext2D::setShadowOffsetY(float y)

- state().m_shadowOffset.setHeight(y);

- applyShadow();

-float CanvasRenderingContext2D::shadowBlur() const

- return state().m_shadowBlur;

-void CanvasRenderingContext2D::setShadowBlur(float blur)

- state().m_shadowBlur = blur;

- applyShadow();

-String CanvasRenderingContext2D::shadowColor() const

- // FIXME: What should this return if you called setShadow with a non-string color?

- return state().m_shadowColor;

-void CanvasRenderingContext2D::setShadowColor(const String& color)

- state().m_shadowColor = color;

- applyShadow();

-float CanvasRenderingContext2D::globalAlpha() const

- return state().m_globalAlpha;

-void CanvasRenderingContext2D::setGlobalAlpha(float alpha)

- if (!(alpha >= 0 && alpha <= 1))

- return;

- state().m_globalAlpha = alpha;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setAlpha(alpha);

-String CanvasRenderingContext2D::globalCompositeOperation() const

- return compositeOperatorName(state().m_globalComposite);

-void CanvasRenderingContext2D::setGlobalCompositeOperation(const String& operation)

- CompositeOperator op;

- if (!parseCompositeOperator(operation, op))

- return;

- state().m_globalComposite = op;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- c->setCompositeOperation(op);

-void CanvasRenderingContext2D::scale(float sx, float sy)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- TransformationMatrix newTransform = state().m_transform;

- newTransform.scale(sx, sy);

- if (!newTransform.isInvertible()) {

- state().m_invertibleCTM = false;

- return;

- }

- state().m_transform = newTransform;

- c->scale(FloatSize(sx, sy));

- m_path.transform(TransformationMatrix().scale(1.0/sx, 1.0/sy));

-void CanvasRenderingContext2D::rotate(float angleInRadians)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- TransformationMatrix newTransform = state().m_transform;

- newTransform.rotate(angleInRadians / piDouble * 180.0);

- if (!newTransform.isInvertible()) {

- state().m_invertibleCTM = false;

- return;

- }

- state().m_transform = newTransform;

- c->rotate(angleInRadians);

- m_path.transform(TransformationMatrix().rotate(-angleInRadians / piDouble * 180.0));

-void CanvasRenderingContext2D::translate(float tx, float ty)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- TransformationMatrix newTransform = state().m_transform;

- newTransform.translate(tx, ty);

- if (!newTransform.isInvertible()) {

- state().m_invertibleCTM = false;

- return;

- }

- state().m_transform = newTransform;

- c->translate(tx, ty);

- m_path.transform(TransformationMatrix().translate(-tx, -ty));

-void CanvasRenderingContext2D::transform(float m11, float m12, float m21, float m22, float dx, float dy)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- // HTML5 3.14.11.1 -- ignore any calls that pass non-finite numbers

- if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |

- !isfinite(m12) | !isfinite(m22) | !isfinite(dy))

- return;

- TransformationMatrix transform(m11, m12, m21, m22, dx, dy);

- TransformationMatrix newTransform = transform * state().m_transform;

- if (!newTransform.isInvertible()) {

- state().m_invertibleCTM = false;

- return;

- }

- state().m_transform = newTransform;

- c->concatCTM(transform);

- m_path.transform(transform.inverse());

-void CanvasRenderingContext2D::setTransform(float m11, float m12, float m21, float m22, float dx, float dy)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- // HTML5 3.14.11.1 -- ignore any calls that pass non-finite numbers

- if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |

- !isfinite(m12) | !isfinite(m22) | !isfinite(dy))

- return;

- TransformationMatrix ctm = state().m_transform;

- if (!ctm.isInvertible())

- return;

- c->concatCTM(c->getCTM().inverse());

- c->concatCTM(m_canvas->baseTransform());

- state().m_transform.multiply(ctm.inverse());

- m_path.transform(ctm);

- state().m_invertibleCTM = true;

- transform(m11, m12, m21, m22, dx, dy);

-void CanvasRenderingContext2D::setStrokeColor(const String& color)

- setStrokeStyle(CanvasStyle::create(color));

-void CanvasRenderingContext2D::setStrokeColor(float grayLevel)

- setStrokeStyle(CanvasStyle::create(grayLevel, 1));

-void CanvasRenderingContext2D::setStrokeColor(const String& color, float alpha)

- setStrokeStyle(CanvasStyle::create(color, alpha));

-void CanvasRenderingContext2D::setStrokeColor(float grayLevel, float alpha)

- setStrokeStyle(CanvasStyle::create(grayLevel, alpha));

-void CanvasRenderingContext2D::setStrokeColor(float r, float g, float b, float a)

- setStrokeStyle(CanvasStyle::create(r, g, b, a));

-void CanvasRenderingContext2D::setStrokeColor(float c, float m, float y, float k, float a)

- setStrokeStyle(CanvasStyle::create(c, m, y, k, a));

-void CanvasRenderingContext2D::setFillColor(const String& color)

- setFillStyle(CanvasStyle::create(color));

-void CanvasRenderingContext2D::setFillColor(float grayLevel)

- setFillStyle(CanvasStyle::create(grayLevel, 1));

-void CanvasRenderingContext2D::setFillColor(const String& color, float alpha)

- setFillStyle(CanvasStyle::create(color, alpha));

-void CanvasRenderingContext2D::setFillColor(float grayLevel, float alpha)

- setFillStyle(CanvasStyle::create(grayLevel, alpha));

-void CanvasRenderingContext2D::setFillColor(float r, float g, float b, float a)

- setFillStyle(CanvasStyle::create(r, g, b, a));

-void CanvasRenderingContext2D::setFillColor(float c, float m, float y, float k, float a)

- setFillStyle(CanvasStyle::create(c, m, y, k, a));

-void CanvasRenderingContext2D::beginPath()

- m_path.clear();

-void CanvasRenderingContext2D::closePath()

- m_path.closeSubpath();

-void CanvasRenderingContext2D::moveTo(float x, float y)

- if (!isfinite(x) | !isfinite(y))

- return;

- if (!state().m_invertibleCTM)

- return;

- m_path.moveTo(FloatPoint(x, y));

-void CanvasRenderingContext2D::lineTo(float x, float y)

- if (!isfinite(x) | !isfinite(y))

- return;

- if (!state().m_invertibleCTM)

- return;

- m_path.addLineTo(FloatPoint(x, y));

-void CanvasRenderingContext2D::quadraticCurveTo(float cpx, float cpy, float x, float y)

- if (!isfinite(cpx) | !isfinite(cpy) | !isfinite(x) | !isfinite(y))

- return;

- if (!state().m_invertibleCTM)

- return;

- m_path.addQuadCurveTo(FloatPoint(cpx, cpy), FloatPoint(x, y));

-void CanvasRenderingContext2D::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y)

- return;

- if (!state().m_invertibleCTM)

- return;

- m_path.addBezierCurveTo(FloatPoint(cp1x, cp1y), FloatPoint(cp2x, cp2y), FloatPoint(x, y));

-void CanvasRenderingContext2D::arcTo(float x0, float y0, float x1, float y1, float r, ExceptionCode& ec)

- ec = 0;

- if (!isfinite(x0) | !isfinite(y0) | !isfinite(x1) | !isfinite(y1) | !isfinite(r))

- return;

- if (r < 0) {

- ec = INDEX_SIZE_ERR;

- return;

- }

- if (!state().m_invertibleCTM)

- return;

- m_path.addArcTo(FloatPoint(x0, y0), FloatPoint(x1, y1), r);

-void CanvasRenderingContext2D::arc(float x, float y, float r, float sa, float ea, bool anticlockwise, ExceptionCode& ec)

- ec = 0;

- if (!isfinite(x) | !isfinite(y) | !isfinite(r) | !isfinite(sa) | !isfinite(ea))

- return;

- if (r < 0) {

- ec = INDEX_SIZE_ERR;

- return;

- }

- if (!state().m_invertibleCTM)

- return;

- m_path.addArc(FloatPoint(x, y), r, sa, ea, anticlockwise);

-static bool validateRectForCanvas(float& x, float& y, float& width, float& height)

- if (!isfinite(x) | !isfinite(y) | !isfinite(width) | !isfinite(height))

- return false;

- if (width < 0) {

- width = -width;

- x -= width;

- }

- if (height < 0) {

- height = -height;

- y -= height;

- }

- return true;

-void CanvasRenderingContext2D::rect(float x, float y, float width, float height)

- if (!validateRectForCanvas(x, y, width, height))

- return;

- if (!state().m_invertibleCTM)

- return;

- m_path.addRect(FloatRect(x, y, width, height));

-#if ENABLE(DASHBOARD_SUPPORT)

-void CanvasRenderingContext2D::clearPathForDashboardBackwardCompatibilityMode()

- if (Settings* settings = m_canvas->document()->settings())

- if (settings->usesDashboardBackwardCompatibilityMode())

- m_path.clear();

-#endif

-void CanvasRenderingContext2D::fill()

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- if (!m_path.isEmpty()) {

- c->beginPath();

- c->addPath(m_path);

- willDraw(m_path.boundingRect());

- c->fillPath();

- }

-#if ENABLE(DASHBOARD_SUPPORT)

- clearPathForDashboardBackwardCompatibilityMode();

-#endif

-void CanvasRenderingContext2D::stroke()

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- if (!m_path.isEmpty()) {

- c->beginPath();

- c->addPath(m_path);

- CanvasStrokeStyleApplier strokeApplier(this);

- FloatRect boundingRect = m_path.strokeBoundingRect(&strokeApplier);

- willDraw(boundingRect);

- c->strokePath();

- }

-#if ENABLE(DASHBOARD_SUPPORT)

- clearPathForDashboardBackwardCompatibilityMode();

-#endif

-void CanvasRenderingContext2D::clip()

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- c->clip(m_path);

-#if ENABLE(DASHBOARD_SUPPORT)

- clearPathForDashboardBackwardCompatibilityMode();

-#endif

-bool CanvasRenderingContext2D::isPointInPath(const float x, const float y)

- GraphicsContext* c = drawingContext();

- if (!c)

- return false;

- if (!state().m_invertibleCTM)

- return false;

- FloatPoint point(x, y);

- TransformationMatrix ctm = state().m_transform;

- FloatPoint transformedPoint = ctm.inverse().mapPoint(point);

- return m_path.contains(transformedPoint);

-void CanvasRenderingContext2D::clearRect(float x, float y, float width, float height)

- if (!validateRectForCanvas(x, y, width, height))

- return;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- FloatRect rect(x, y, width, height);

- willDraw(rect);

- c->clearRect(rect);

-void CanvasRenderingContext2D::fillRect(float x, float y, float width, float height)

- if (!validateRectForCanvas(x, y, width, height))

- return;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- FloatRect rect(x, y, width, height);

- willDraw(rect);

- c->save();

- c->fillRect(rect);

- c->restore();

-void CanvasRenderingContext2D::strokeRect(float x, float y, float width, float height)

- if (!validateRectForCanvas(x, y, width, height))

- return;

- strokeRect(x, y, width, height, state().m_lineWidth);

-void CanvasRenderingContext2D::strokeRect(float x, float y, float width, float height, float lineWidth)

- if (!validateRectForCanvas(x, y, width, height))

- return;

- if (!(lineWidth >= 0))

- return;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- FloatRect rect(x, y, width, height);

- FloatRect boundingRect = rect;

- boundingRect.inflate(lineWidth / 2);

- willDraw(boundingRect);

- c->strokeRect(rect, lineWidth);

-#if PLATFORM(CG)

-static inline CGSize adjustedShadowSize(CGFloat width, CGFloat height)

- // Work around <rdar://problem/5539388> by ensuring that shadow offsets will get truncated

- // to the desired integer.

- static const CGFloat extraShadowOffset = narrowPrecisionToCGFloat(1.0 / 128);

- if (width > 0)

- width += extraShadowOffset;

- else if (width < 0)

- width -= extraShadowOffset;

- if (height > 0)

- height += extraShadowOffset;

- else if (height < 0)

- height -= extraShadowOffset;

- return CGSizeMake(width, height);

-#endif

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = "";

- applyShadow();

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = color;

- applyShadow();

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float grayLevel)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = "";

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- RGBA32 rgba = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, 1.0f);

- c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color, float alpha)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = color;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- RGBA32 rgba = 0; // default is transparent black

- if (!state().m_shadowColor.isEmpty())

- CSSParser::parseColor(rgba, state().m_shadowColor);

- c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(colorWithOverrideAlpha(rgba, alpha)));

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float grayLevel, float alpha)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = "";

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- RGBA32 rgba = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, alpha);

- c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float r, float g, float b, float a)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = "";

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- RGBA32 rgba = makeRGBA32FromFloats(r, g, b, a); // default is transparent black

- if (!state().m_shadowColor.isEmpty())

- CSSParser::parseColor(rgba, state().m_shadowColor);

- c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

-void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float c, float m, float y, float k, float a)

- state().m_shadowOffset = FloatSize(width, height);

- state().m_shadowBlur = blur;

- state().m_shadowColor = "";

- GraphicsContext* dc = drawingContext();

- if (!dc)

- return;

- // FIXME: Do this through platform-independent GraphicsContext API.

-#if PLATFORM(CG)

- const CGFloat components[5] = { c, m, y, k, a };

- CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceCMYK();

- CGColorRef shadowColor = CGColorCreate(colorSpace, components);

- CGColorSpaceRelease(colorSpace);

- CGContextSetShadowWithColor(dc->platformContext(), adjustedShadowSize(width, -height), blur, shadowColor);

- CGColorRelease(shadowColor);

-#endif

-void CanvasRenderingContext2D::clearShadow()

- state().m_shadowOffset = FloatSize();

- state().m_shadowBlur = 0;

- state().m_shadowColor = "";

- applyShadow();

-void CanvasRenderingContext2D::applyShadow()

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- RGBA32 rgba = 0; // default is transparent black

- if (!state().m_shadowColor.isEmpty())

- CSSParser::parseColor(rgba, state().m_shadowColor);

- float width = state().m_shadowOffset.width();

- float height = state().m_shadowOffset.height();

- c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

-static IntSize size(HTMLImageElement* image)

- if (CachedImage* cachedImage = image->cachedImage())

- return cachedImage->imageSize(1.0f); // FIXME: Not sure about this.

- return IntSize();

-static inline FloatRect normalizeRect(const FloatRect& rect)

- return FloatRect(min(rect.x(), rect.right()),

- min(rect.y(), rect.bottom()),

- max(rect.width(), -rect.width()),

- max(rect.height(), -rect.height()));

-void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, float x, float y)

- ASSERT(image);

- IntSize s = size(image);

- ExceptionCode ec;

- drawImage(image, x, y, s.width(), s.height(), ec);

-void CanvasRenderingContext2D::drawImage(HTMLImageElement* image,

- float x, float y, float width, float height, ExceptionCode& ec)

- ASSERT(image);

- IntSize s = size(image);

- drawImage(image, FloatRect(0, 0, s.width(), s.height()), FloatRect(x, y, width, height), ec);

-void CanvasRenderingContext2D::checkOrigin(const KURL& url)

- RefPtr<SecurityOrigin> origin = SecurityOrigin::create(url);

- if (!m_canvas->document()->securityOrigin()->canAccess(origin.get()))

- m_canvas->setOriginTainted();

-void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, const FloatRect& srcRect, const FloatRect& dstRect,

- ExceptionCode& ec)

- ASSERT(image);

- ec = 0;

- FloatRect imageRect = FloatRect(FloatPoint(), size(image));

- if (!imageRect.contains(normalizeRect(srcRect)) || srcRect.width() == 0 || srcRect.height() == 0) {

- ec = INDEX_SIZE_ERR;

- return;

- }

- if (!dstRect.width() || !dstRect.height())

- return;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- CachedImage* cachedImage = image->cachedImage();

- if (!cachedImage)

- return;

- if (m_canvas->originClean())

- checkOrigin(cachedImage->response().url());

- if (m_canvas->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())

- m_canvas->setOriginTainted();

- FloatRect sourceRect = c->roundToDevicePixels(srcRect);

- FloatRect destRect = c->roundToDevicePixels(dstRect);

- willDraw(destRect);

- c->drawImage(cachedImage->image(), destRect, sourceRect, state().m_globalComposite);

-void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas, float x, float y)

- ASSERT(canvas);

- ExceptionCode ec;

- drawImage(canvas, x, y, canvas->width(), canvas->height(), ec);

-void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas,

- float x, float y, float width, float height, ExceptionCode& ec)

- ASSERT(canvas);

- drawImage(canvas, FloatRect(0, 0, canvas->width(), canvas->height()), FloatRect(x, y, width, height), ec);

-void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas, const FloatRect& srcRect,

- const FloatRect& dstRect, ExceptionCode& ec)

- ASSERT(canvas);

- ec = 0;

- FloatRect srcCanvasRect = FloatRect(FloatPoint(), canvas->size());

- if (!srcCanvasRect.contains(normalizeRect(srcRect)) || srcRect.width() == 0 || srcRect.height() == 0) {

- ec = INDEX_SIZE_ERR;

- return;

- }

- if (!dstRect.width() || !dstRect.height())

- return;

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- FloatRect sourceRect = c->roundToDevicePixels(srcRect);

- FloatRect destRect = c->roundToDevicePixels(dstRect);

- // FIXME: Do this through platform-independent GraphicsContext API.

- ImageBuffer* buffer = canvas->buffer();

- if (!buffer)

- return;

- if (!canvas->originClean())

- m_canvas->setOriginTainted();

- c->drawImage(buffer->image(), destRect, sourceRect, state().m_globalComposite);

- willDraw(destRect); // This call comes after drawImage, since the buffer we draw into may be our own, and we need to make sure it is dirty.

- // FIXME: Arguably willDraw should become didDraw and occur after drawing calls and not before them to avoid problems like this.

-// FIXME: Why isn't this just another overload of drawImage? Why have a different name?

-void CanvasRenderingContext2D::drawImageFromRect(HTMLImageElement* image,

- float sx, float sy, float sw, float sh,

- float dx, float dy, float dw, float dh,

- const String& compositeOperation)

- if (!image)

- return;

- CachedImage* cachedImage = image->cachedImage();

- if (!cachedImage)

- return;

- if (m_canvas->originClean())

- checkOrigin(cachedImage->response().url());

- if (m_canvas->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())

- m_canvas->setOriginTainted();

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- CompositeOperator op;

- if (!parseCompositeOperator(compositeOperation, op))

- op = CompositeSourceOver;

- FloatRect destRect = FloatRect(dx, dy, dw, dh);

- willDraw(destRect);

- c->drawImage(cachedImage->image(), destRect, FloatRect(sx, sy, sw, sh), op);

-void CanvasRenderingContext2D::setAlpha(float alpha)

- setGlobalAlpha(alpha);

-void CanvasRenderingContext2D::setCompositeOperation(const String& operation)

- setGlobalCompositeOperation(operation);

-PassRefPtr<CanvasGradient> CanvasRenderingContext2D::createLinearGradient(float x0, float y0, float x1, float y1, ExceptionCode& ec)

- if (!isfinite(x0) || !isfinite(y0) || !isfinite(x1) || !isfinite(y1)) {

- ec = NOT_SUPPORTED_ERR;

- return 0;

- }

- return CanvasGradient::create(FloatPoint(x0, y0), FloatPoint(x1, y1));

-PassRefPtr<CanvasGradient> CanvasRenderingContext2D::createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionCode& ec)

- if (!isfinite(x0) || !isfinite(y0) || !isfinite(r0) ||

- !isfinite(x1) || !isfinite(y1) || !isfinite(r1)) {

- ec = NOT_SUPPORTED_ERR;

- return 0;

- }

- return CanvasGradient::create(FloatPoint(x0, y0), r0, FloatPoint(x1, y1), r1);

-PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLImageElement* image,

- const String& repetitionType, ExceptionCode& ec)

- bool repeatX, repeatY;

- ec = 0;

- CanvasPattern::parseRepetitionType(repetitionType, repeatX, repeatY, ec);

- if (ec)

- return 0;

- if (!image->complete()) {

- ec = INVALID_STATE_ERR;

- return 0;

- }

- CachedImage* cachedImage = image->cachedImage();

- if (!cachedImage || !image->cachedImage()->image())

- return CanvasPattern::create(Image::nullImage(), repeatX, repeatY, true);

- RefPtr<SecurityOrigin> origin = SecurityOrigin::createFromString(cachedImage->url());

- bool originClean = m_canvas->document()->securityOrigin()->canAccess(origin.get());

- return CanvasPattern::create(cachedImage->image(), repeatX, repeatY, originClean);

-PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLCanvasElement* canvas,

- const String& repetitionType, ExceptionCode& ec)

- if (!canvas->width() || !canvas->height()) {

- ec = INVALID_STATE_ERR;

- return 0;

- }

- bool repeatX, repeatY;

- ec = 0;

- CanvasPattern::parseRepetitionType(repetitionType, repeatX, repeatY, ec);

- if (ec)

- return 0;

- return CanvasPattern::create(canvas->buffer()->image(), repeatX, repeatY, canvas->originClean());

-void CanvasRenderingContext2D::willDraw(const FloatRect& r, unsigned options)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- FloatRect dirtyRect = r;

- if (options & CanvasWillDrawApplyTransform) {

- TransformationMatrix ctm = state().m_transform;

- dirtyRect = ctm.mapRect(r);

- }

- if (options & CanvasWillDrawApplyShadow) {

- // The shadow gets applied after transformation

- FloatRect shadowRect(dirtyRect);

- shadowRect.move(state().m_shadowOffset);

- shadowRect.inflate(state().m_shadowBlur);

- dirtyRect.unite(shadowRect);

- }

- if (options & CanvasWillDrawApplyClip) {

- // 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.

- }

- m_canvas->willDraw(dirtyRect);

-GraphicsContext* CanvasRenderingContext2D::drawingContext() const

- return m_canvas->drawingContext();

-static PassRefPtr<ImageData> createEmptyImageData(const IntSize& size)

- RefPtr<ImageData> data = ImageData::create(size.width(), size.height());

- memset(data->data()->data()->data(), 0, data->data()->data()->length());

- return data.get();

-PassRefPtr<ImageData> CanvasRenderingContext2D::createImageData(float sw, float sh) const

- FloatSize unscaledSize(sw, sh);

- IntSize scaledSize = m_canvas->convertLogicalToDevice(unscaledSize);

- if (scaledSize.width() < 1)

- scaledSize.setWidth(1);

- if (scaledSize.height() < 1)

- scaledSize.setHeight(1);

- return createEmptyImageData(scaledSize);

-PassRefPtr<ImageData> CanvasRenderingContext2D::getImageData(float sx, float sy, float sw, float sh, ExceptionCode& ec) const

- if (!m_canvas->originClean()) {

- ec = SECURITY_ERR;

- return 0;

- }

- FloatRect unscaledRect(sx, sy, sw, sh);

- IntRect scaledRect = m_canvas->convertLogicalToDevice(unscaledRect);

- if (scaledRect.width() < 1)

- scaledRect.setWidth(1);

- if (scaledRect.height() < 1)

- scaledRect.setHeight(1);

- ImageBuffer* buffer = m_canvas ? m_canvas->buffer() : 0;

- if (!buffer)

- return createEmptyImageData(scaledRect.size());

- return buffer->getImageData(scaledRect);

-void CanvasRenderingContext2D::putImageData(ImageData* data, float dx, float dy, ExceptionCode& ec)

- if (!data) {

- ec = TYPE_MISMATCH_ERR;

- return;

- }

- putImageData(data, dx, dy, 0, 0, data->width(), data->height(), ec);

-void CanvasRenderingContext2D::putImageData(ImageData* data, float dx, float dy, float dirtyX, float dirtyY,

- float dirtyWidth, float dirtyHeight, ExceptionCode& ec)

- if (!data) {

- ec = TYPE_MISMATCH_ERR;

- return;

- }

- if (!isfinite(dx) || !isfinite(dy) || !isfinite(dirtyX) ||

- !isfinite(dirtyY) || !isfinite(dirtyWidth) || !isfinite(dirtyHeight)) {

- ec = INDEX_SIZE_ERR;

- return;

- }

- ImageBuffer* buffer = m_canvas->buffer();

- if (!buffer)

- 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 sourceRect = enclosingIntRect(clipRect);

- sourceRect.move(destOffset);

- sourceRect.intersect(IntRect(IntPoint(), buffer->size()));

- if (sourceRect.isEmpty())

- return;

- willDraw(sourceRect, 0); // ignore transform, shadow and clip

- sourceRect.move(-destOffset);

- IntPoint destPoint(destOffset.width(), destOffset.height());

- buffer->putImageData(data, sourceRect, destPoint);

-String CanvasRenderingContext2D::font() const

- return state().m_unparsedFont;

-void CanvasRenderingContext2D::setFont(const String& newFont)

- RefPtr<CSSMutableStyleDeclaration> tempDecl = CSSMutableStyleDeclaration::create();

- CSSParser parser(!m_canvas->document()->inCompatMode()); // Use the parse mode of the canvas' document when parsing CSS.

- String declarationText("font: ");

- declarationText += newFont;

- parser.parseDeclaration(tempDecl.get(), declarationText);

- if (!tempDecl->length())

- return;

- // The parse succeeded.

- state().m_unparsedFont = newFont;

- // Map the <canvas> font into the text style. If the font uses keywords like larger/smaller, these will work

- // relative to the canvas.

- RefPtr<RenderStyle> newStyle = RenderStyle::create();

- if (m_canvas->computedStyle())

- newStyle->setFontDescription(m_canvas->computedStyle()->fontDescription());

- // Now map the font property into the style.

- CSSStyleSelector* styleSelector = m_canvas->document()->styleSelector();

- styleSelector->applyPropertyToStyle(CSSPropertyFont, tempDecl->getPropertyCSSValue(CSSPropertyFont).get(), newStyle.get());

- state().m_font = newStyle->font();

- state().m_font.update(styleSelector->fontSelector());

- state().m_realizedFont = true;

-String CanvasRenderingContext2D::textAlign() const

- return textAlignName(state().m_textAlign);

-void CanvasRenderingContext2D::setTextAlign(const String& s)

- TextAlign align;

- if (!parseTextAlign(s, align))

- return;

- state().m_textAlign = align;

-String CanvasRenderingContext2D::textBaseline() const

- return textBaselineName(state().m_textBaseline);

-void CanvasRenderingContext2D::setTextBaseline(const String& s)

- TextBaseline baseline;

- if (!parseTextBaseline(s, baseline))

- return;

- state().m_textBaseline = baseline;

-void CanvasRenderingContext2D::fillText(const String& text, float x, float y)

- drawTextInternal(text, x, y, true);

-void CanvasRenderingContext2D::fillText(const String& text, float x, float y, float maxWidth)

- drawTextInternal(text, x, y, true, maxWidth, true);

-void CanvasRenderingContext2D::strokeText(const String& text, float x, float y)

- drawTextInternal(text, x, y, false);

-void CanvasRenderingContext2D::strokeText(const String& text, float x, float y, float maxWidth)

- drawTextInternal(text, x, y, false, maxWidth, true);

-PassRefPtr<TextMetrics> CanvasRenderingContext2D::measureText(const String& text)

- RefPtr<TextMetrics> metrics = TextMetrics::create();

- metrics->setWidth(accessFont().width(TextRun(text.characters(), text.length())));

- return metrics;

-void CanvasRenderingContext2D::drawTextInternal(const String& text, float x, float y, bool fill, float /*maxWidth*/, bool /*useMaxWidth*/)

- GraphicsContext* c = drawingContext();

- if (!c)

- return;

- if (!state().m_invertibleCTM)

- return;

- const Font& font = accessFont();

- // FIXME: Handle maxWidth.

- // FIXME: Need to turn off font smoothing.

- bool rtl = m_canvas->computedStyle() ? m_canvas->computedStyle()->direction() == RTL : false;

- bool override = m_canvas->computedStyle() ? m_canvas->computedStyle()->unicodeBidi() == Override : false;

- unsigned length = text.length();

- const UChar* string = text.characters();

- TextRun textRun(string, length, 0, 0, 0, rtl, override, false, false);

- // Draw the item text at the correct point.

- FloatPoint location(x, y);

- switch (state().m_textBaseline) {

- case TopTextBaseline:

- case HangingTextBaseline:

- location.setY(y + font.ascent());

- break;

- case BottomTextBaseline:

- case IdeographicTextBaseline:

- location.setY(y - font.descent());

- break;

- case MiddleTextBaseline:

- location.setY(y - font.descent() + font.height() / 2);

- break;

- case AlphabeticTextBaseline:

- default:

- // Do nothing.

- break;

- }

- float width = font.width(TextRun(text, false, 0, 0, rtl, override));

- TextAlign align = state().m_textAlign;

- if (align == StartTextAlign)

- align = rtl ? RightTextAlign : LeftTextAlign;

- else if (align == EndTextAlign)

- align = rtl ? LeftTextAlign : RightTextAlign;

- switch (align) {

- case CenterTextAlign:

- location.setX(location.x() - width / 2);

- break;

- case RightTextAlign:

- location.setX(location.x() - width);

- break;

- default:

- break;

- }

- // The slop built in to this mask rect matches the heuristic used in FontCGWin.cpp for GDI text.

- FloatRect textRect = FloatRect(location.x() - font.height() / 2, location.y() - font.ascent() - font.lineGap(),

- width + font.height(), font.lineSpacing());

- if (!fill)

- textRect.inflate(c->strokeThickness() / 2);

- if (fill)

- m_canvas->willDraw(textRect);

- else {

- // When stroking text, pointy miters can extend outside of textRect, so we

- // punt and dirty the whole canvas.

- m_canvas->willDraw(FloatRect(0, 0, m_canvas->width(), m_canvas->height()));

- }

- CanvasStyle* drawStyle = fill ? state().m_fillStyle.get() : state().m_strokeStyle.get();

- if (drawStyle->canvasGradient() || drawStyle->canvasPattern()) {

- // FIXME: The rect is not big enough for miters on stroked text.

- IntRect maskRect = enclosingIntRect(textRect);

- auto_ptr<ImageBuffer> maskImage = ImageBuffer::create(maskRect.size(), false);

- GraphicsContext* maskImageContext = maskImage->context();

- if (fill)

- maskImageContext->setFillColor(Color::black);

- else {

- maskImageContext->setStrokeColor(Color::black);

- maskImageContext->setStrokeThickness(c->strokeThickness());

- }

- maskImageContext->setTextDrawingMode(fill ? cTextFill : cTextStroke);

- maskImageContext->translate(-maskRect.x(), -maskRect.y());

- maskImageContext->drawBidiText(font, textRun, location);

- c->save();

- c->clipToImageBuffer(maskRect, maskImage.get());

- drawStyle->applyFillColor(c);

- c->fillRect(maskRect);

- c->restore();

- return;

- }

- c->setTextDrawingMode(fill ? cTextFill : cTextStroke);

- c->drawBidiText(font, textRun, location);

-const Font& CanvasRenderingContext2D::accessFont()

- if (!state().m_realizedFont)

- setFont(state().m_unparsedFont);

- return state().m_font;

-} // namespace WebCore

+/*

+ *

+ * 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 COMPUTER, 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 COMPUTER, 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 "CanvasRenderingContext2D.h"

+#include "TransformationMatrix.h"

+#include "CSSParser.h"

+#include "CachedImage.h"

+#include "CanvasGradient.h"

+#include "CanvasPattern.h"

+#include "CanvasStyle.h"

+#include "CSSPropertyNames.h"

+#include "CSSStyleSelector.h"

+#include "Document.h"

+#include "ExceptionCode.h"

+#include "FloatConversion.h"

+#include "Frame.h"

+#include "GraphicsContext.h"

+#include "HTMLCanvasElement.h"

+#include "HTMLImageElement.h"

+#include "HTMLNames.h"

+#include "ImageBuffer.h"

+#include "ImageData.h"

+#include "KURL.h"

+#include "NotImplemented.h"

+#include "Page.h"

+#include "RenderHTMLCanvas.h"

+#include "SecurityOrigin.h"

+#include "Settings.h"

+#include "StrokeStyleApplier.h"

+#include "TextMetrics.h"

+#include <stdio.h>

+#include <wtf/ByteArray.h>

+#include <wtf/MathExtras.h>

+using namespace std;

+namespace WebCore {

+using namespace HTMLNames;

+static const char* const defaultFont = "10px sans-serif";

+class CanvasStrokeStyleApplier : public StrokeStyleApplier {

+public:

+ CanvasStrokeStyleApplier(CanvasRenderingContext2D* canvasContext)

+ : m_canvasContext(canvasContext)

+ {

+ }

+ virtual void strokeStyle(GraphicsContext* c)

+ {

+ c->setStrokeThickness(m_canvasContext->lineWidth());

+ c->setLineCap(m_canvasContext->getLineCap());

+ c->setLineJoin(m_canvasContext->getLineJoin());

+ c->setMiterLimit(m_canvasContext->miterLimit());

+ }

+private:

+ CanvasRenderingContext2D* m_canvasContext;

+};

+CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas)

+ : m_canvas(canvas)

+ , m_stateStack(1)

+void CanvasRenderingContext2D::ref()

+ m_canvas->ref();

+void CanvasRenderingContext2D::deref()

+ m_canvas->deref();

+void CanvasRenderingContext2D::reset()

+ m_stateStack.resize(1);

+ m_stateStack.first() = State();

+CanvasRenderingContext2D::State::State()

+ : m_strokeStyle(CanvasStyle::create("black"))

+ , m_fillStyle(CanvasStyle::create("black"))

+ , m_lineWidth(1)

+ , m_lineCap(ButtCap)

+ , m_lineJoin(MiterJoin)

+ , m_miterLimit(10)

+ , m_shadowBlur(0)

+ , m_shadowColor("black")

+ , m_globalAlpha(1)

+ , m_globalComposite(CompositeSourceOver)

+ , m_invertibleCTM(true)

+ , m_textAlign(StartTextAlign)

+ , m_textBaseline(AlphabeticTextBaseline)

+ , m_unparsedFont(defaultFont)

+ , m_realizedFont(false)

+void CanvasRenderingContext2D::save()

+ ASSERT(m_stateStack.size() >= 1);

+ m_stateStack.append(state());

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->save();

+void CanvasRenderingContext2D::restore()

+ ASSERT(m_stateStack.size() >= 1);

+ if (m_stateStack.size() <= 1)

+ return;

+ m_path.transform(state().m_transform);

+ m_stateStack.removeLast();

+ m_path.transform(state().m_transform.inverse());

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->restore();

+CanvasStyle* CanvasRenderingContext2D::strokeStyle() const

+ return state().m_strokeStyle.get();

+void CanvasRenderingContext2D::setStrokeStyle(PassRefPtr<CanvasStyle> style)

+ if (!style)

+ return;

+ if (m_canvas->originClean()) {

+ if (CanvasPattern* pattern = style->canvasPattern()) {

+ if (!pattern->originClean())

+ m_canvas->setOriginTainted();

+ }

+ state().m_strokeStyle = style;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ state().m_strokeStyle->applyStrokeColor(c);

+CanvasStyle* CanvasRenderingContext2D::fillStyle() const

+ return state().m_fillStyle.get();

+void CanvasRenderingContext2D::setFillStyle(PassRefPtr<CanvasStyle> style)

+ if (!style)

+ return;

+ if (m_canvas->originClean()) {

+ if (CanvasPattern* pattern = style->canvasPattern()) {

+ if (!pattern->originClean())

+ m_canvas->setOriginTainted();

+ }

+ state().m_fillStyle = style;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ state().m_fillStyle->applyFillColor(c);

+float CanvasRenderingContext2D::lineWidth() const

+ return state().m_lineWidth;

+void CanvasRenderingContext2D::setLineWidth(float width)

+ if (!(width > 0))

+ return;

+ state().m_lineWidth = width;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setStrokeThickness(width);

+String CanvasRenderingContext2D::lineCap() const

+ return lineCapName(state().m_lineCap);

+void CanvasRenderingContext2D::setLineCap(const String& s)

+ LineCap cap;

+ if (!parseLineCap(s, cap))

+ return;

+ state().m_lineCap = cap;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setLineCap(cap);

+String CanvasRenderingContext2D::lineJoin() const

+ return lineJoinName(state().m_lineJoin);

+void CanvasRenderingContext2D::setLineJoin(const String& s)

+ LineJoin join;

+ if (!parseLineJoin(s, join))

+ return;

+ state().m_lineJoin = join;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setLineJoin(join);

+float CanvasRenderingContext2D::miterLimit() const

+ return state().m_miterLimit;

+void CanvasRenderingContext2D::setMiterLimit(float limit)

+ if (!(limit > 0))

+ return;

+ state().m_miterLimit = limit;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setMiterLimit(limit);

+float CanvasRenderingContext2D::shadowOffsetX() const

+ return state().m_shadowOffset.width();

+void CanvasRenderingContext2D::setShadowOffsetX(float x)

+ state().m_shadowOffset.setWidth(x);

+ applyShadow();

+float CanvasRenderingContext2D::shadowOffsetY() const

+ return state().m_shadowOffset.height();

+void CanvasRenderingContext2D::setShadowOffsetY(float y)

+ state().m_shadowOffset.setHeight(y);

+ applyShadow();

+float CanvasRenderingContext2D::shadowBlur() const

+ return state().m_shadowBlur;

+void CanvasRenderingContext2D::setShadowBlur(float blur)

+ state().m_shadowBlur = blur;

+ applyShadow();

+String CanvasRenderingContext2D::shadowColor() const

+ // FIXME: What should this return if you called setShadow with a non-string color?

+ return state().m_shadowColor;

+void CanvasRenderingContext2D::setShadowColor(const String& color)

+ state().m_shadowColor = color;

+ applyShadow();

+float CanvasRenderingContext2D::globalAlpha() const

+ return state().m_globalAlpha;

+void CanvasRenderingContext2D::setGlobalAlpha(float alpha)

+ if (!(alpha >= 0 && alpha <= 1))

+ return;

+ state().m_globalAlpha = alpha;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setAlpha(alpha);

+String CanvasRenderingContext2D::globalCompositeOperation() const

+ return compositeOperatorName(state().m_globalComposite);

+void CanvasRenderingContext2D::setGlobalCompositeOperation(const String& operation)

+ CompositeOperator op;

+ if (!parseCompositeOperator(operation, op))

+ return;

+ state().m_globalComposite = op;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ c->setCompositeOperation(op);

+void CanvasRenderingContext2D::scale(float sx, float sy)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ TransformationMatrix newTransform = state().m_transform;

+ newTransform.scale(sx, sy);

+ if (!newTransform.isInvertible()) {

+ state().m_invertibleCTM = false;

+ return;

+ }

+ state().m_transform = newTransform;

+ c->scale(FloatSize(sx, sy));

+ m_path.transform(TransformationMatrix().scale(1.0/sx, 1.0/sy));

+void CanvasRenderingContext2D::rotate(float angleInRadians)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ TransformationMatrix newTransform = state().m_transform;

+ newTransform.rotate(angleInRadians / piDouble * 180.0);

+ if (!newTransform.isInvertible()) {

+ state().m_invertibleCTM = false;

+ return;

+ }

+ state().m_transform = newTransform;

+ c->rotate(angleInRadians);

+ m_path.transform(TransformationMatrix().rotate(-angleInRadians / piDouble * 180.0));

+void CanvasRenderingContext2D::translate(float tx, float ty)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ TransformationMatrix newTransform = state().m_transform;

+ newTransform.translate(tx, ty);

+ if (!newTransform.isInvertible()) {

+ state().m_invertibleCTM = false;

+ return;

+ }

+ state().m_transform = newTransform;

+ c->translate(tx, ty);

+ m_path.transform(TransformationMatrix().translate(-tx, -ty));

+void CanvasRenderingContext2D::transform(float m11, float m12, float m21, float m22, float dx, float dy)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ // HTML5 3.14.11.1 -- ignore any calls that pass non-finite numbers

+ if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |

+ !isfinite(m12) | !isfinite(m22) | !isfinite(dy))

+ return;

+ TransformationMatrix transform(m11, m12, m21, m22, dx, dy);

+ TransformationMatrix newTransform = transform * state().m_transform;

+ if (!newTransform.isInvertible()) {

+ state().m_invertibleCTM = false;

+ return;

+ }

+ state().m_transform = newTransform;

+ c->concatCTM(transform);

+ m_path.transform(transform.inverse());

+void CanvasRenderingContext2D::setTransform(float m11, float m12, float m21, float m22, float dx, float dy)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ // HTML5 3.14.11.1 -- ignore any calls that pass non-finite numbers

+ if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |

+ !isfinite(m12) | !isfinite(m22) | !isfinite(dy))

+ return;

+ TransformationMatrix ctm = state().m_transform;

+ if (!ctm.isInvertible())

+ return;

+ c->concatCTM(c->getCTM().inverse());

+ c->concatCTM(m_canvas->baseTransform());

+ state().m_transform.multiply(ctm.inverse());

+ m_path.transform(ctm);

+ state().m_invertibleCTM = true;

+ transform(m11, m12, m21, m22, dx, dy);

+void CanvasRenderingContext2D::setStrokeColor(const String& color)

+ setStrokeStyle(CanvasStyle::create(color));

+void CanvasRenderingContext2D::setStrokeColor(float grayLevel)

+ setStrokeStyle(CanvasStyle::create(grayLevel, 1));

+void CanvasRenderingContext2D::setStrokeColor(const String& color, float alpha)

+ setStrokeStyle(CanvasStyle::create(color, alpha));

+void CanvasRenderingContext2D::setStrokeColor(float grayLevel, float alpha)

+ setStrokeStyle(CanvasStyle::create(grayLevel, alpha));

+void CanvasRenderingContext2D::setStrokeColor(float r, float g, float b, float a)

+ setStrokeStyle(CanvasStyle::create(r, g, b, a));

+void CanvasRenderingContext2D::setStrokeColor(float c, float m, float y, float k, float a)

+ setStrokeStyle(CanvasStyle::create(c, m, y, k, a));

+void CanvasRenderingContext2D::setFillColor(const String& color)

+ setFillStyle(CanvasStyle::create(color));

+void CanvasRenderingContext2D::setFillColor(float grayLevel)

+ setFillStyle(CanvasStyle::create(grayLevel, 1));

+void CanvasRenderingContext2D::setFillColor(const String& color, float alpha)

+ setFillStyle(CanvasStyle::create(color, alpha));

+void CanvasRenderingContext2D::setFillColor(float grayLevel, float alpha)

+ setFillStyle(CanvasStyle::create(grayLevel, alpha));

+void CanvasRenderingContext2D::setFillColor(float r, float g, float b, float a)

+ setFillStyle(CanvasStyle::create(r, g, b, a));

+void CanvasRenderingContext2D::setFillColor(float c, float m, float y, float k, float a)

+ setFillStyle(CanvasStyle::create(c, m, y, k, a));

+void CanvasRenderingContext2D::beginPath()

+ m_path.clear();

+void CanvasRenderingContext2D::closePath()

+ m_path.closeSubpath();

+void CanvasRenderingContext2D::moveTo(float x, float y)

+ if (!isfinite(x) | !isfinite(y))

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.moveTo(FloatPoint(x, y));

+void CanvasRenderingContext2D::lineTo(float x, float y)

+ if (!isfinite(x) | !isfinite(y))

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addLineTo(FloatPoint(x, y));

+void CanvasRenderingContext2D::quadraticCurveTo(float cpx, float cpy, float x, float y)

+ if (!isfinite(cpx) | !isfinite(cpy) | !isfinite(x) | !isfinite(y))

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addQuadCurveTo(FloatPoint(cpx, cpy), FloatPoint(x, y));

+void CanvasRenderingContext2D::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addBezierCurveTo(FloatPoint(cp1x, cp1y), FloatPoint(cp2x, cp2y), FloatPoint(x, y));

+void CanvasRenderingContext2D::arcTo(float x0, float y0, float x1, float y1, float r, ExceptionCode& ec)

+ ec = 0;

+ if (!isfinite(x0) | !isfinite(y0) | !isfinite(x1) | !isfinite(y1) | !isfinite(r))

+ return;

+ if (r < 0) {

+ ec = INDEX_SIZE_ERR;

+ return;

+ }

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addArcTo(FloatPoint(x0, y0), FloatPoint(x1, y1), r);

+void CanvasRenderingContext2D::arc(float x, float y, float r, float sa, float ea, bool anticlockwise, ExceptionCode& ec)

+ ec = 0;

+ if (!isfinite(x) | !isfinite(y) | !isfinite(r) | !isfinite(sa) | !isfinite(ea))

+ return;

+ if (r < 0) {

+ ec = INDEX_SIZE_ERR;

+ return;

+ }

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addArc(FloatPoint(x, y), r, sa, ea, anticlockwise);

+static bool validateRectForCanvas(float& x, float& y, float& width, float& height)

+ if (!isfinite(x) | !isfinite(y) | !isfinite(width) | !isfinite(height))

+ return false;

+ if (width < 0) {

+ width = -width;

+ x -= width;

+ }

+ if (height < 0) {

+ height = -height;

+ y -= height;

+ }

+ return true;

+void CanvasRenderingContext2D::rect(float x, float y, float width, float height)

+ if (!validateRectForCanvas(x, y, width, height))

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ m_path.addRect(FloatRect(x, y, width, height));

+#if ENABLE(DASHBOARD_SUPPORT)

+void CanvasRenderingContext2D::clearPathForDashboardBackwardCompatibilityMode()

+ if (Settings* settings = m_canvas->document()->settings())

+ if (settings->usesDashboardBackwardCompatibilityMode())

+ m_path.clear();

+#endif

+void CanvasRenderingContext2D::fill()

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ if (!m_path.isEmpty()) {

+ c->beginPath();

+ c->addPath(m_path);

+ willDraw(m_path.boundingRect());

+ c->fillPath();

+ }

+#if ENABLE(DASHBOARD_SUPPORT)

+ clearPathForDashboardBackwardCompatibilityMode();

+#endif

+void CanvasRenderingContext2D::stroke()

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ if (!m_path.isEmpty()) {

+ c->beginPath();

+ c->addPath(m_path);

+ CanvasStrokeStyleApplier strokeApplier(this);

+ FloatRect boundingRect = m_path.strokeBoundingRect(&strokeApplier);

+ willDraw(boundingRect);

+ c->strokePath();

+ }

+#if ENABLE(DASHBOARD_SUPPORT)

+ clearPathForDashboardBackwardCompatibilityMode();

+#endif

+void CanvasRenderingContext2D::clip()

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ c->clip(m_path);

+#if ENABLE(DASHBOARD_SUPPORT)

+ clearPathForDashboardBackwardCompatibilityMode();

+#endif

+bool CanvasRenderingContext2D::isPointInPath(const float x, const float y)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return false;

+ if (!state().m_invertibleCTM)

+ return false;

+ FloatPoint point(x, y);

+ TransformationMatrix ctm = state().m_transform;

+ FloatPoint transformedPoint = ctm.inverse().mapPoint(point);

+ return m_path.contains(transformedPoint);

+void CanvasRenderingContext2D::clearRect(float x, float y, float width, float height)

+ if (!validateRectForCanvas(x, y, width, height))

+ return;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ FloatRect rect(x, y, width, height);

+ willDraw(rect);

+ c->clearRect(rect);

+void CanvasRenderingContext2D::fillRect(float x, float y, float width, float height)

+ if (!validateRectForCanvas(x, y, width, height))

+ return;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ FloatRect rect(x, y, width, height);

+ willDraw(rect);

+ c->save();

+ c->fillRect(rect);

+ c->restore();

+void CanvasRenderingContext2D::strokeRect(float x, float y, float width, float height)

+ if (!validateRectForCanvas(x, y, width, height))

+ return;

+ strokeRect(x, y, width, height, state().m_lineWidth);

+void CanvasRenderingContext2D::strokeRect(float x, float y, float width, float height, float lineWidth)

+ if (!validateRectForCanvas(x, y, width, height))

+ return;

+ if (!(lineWidth >= 0))

+ return;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ FloatRect rect(x, y, width, height);

+ FloatRect boundingRect = rect;

+ boundingRect.inflate(lineWidth / 2);

+ willDraw(boundingRect);

+ c->strokeRect(rect, lineWidth);

+#if PLATFORM(CG)

+static inline CGSize adjustedShadowSize(CGFloat width, CGFloat height)

+ // Work around <rdar://problem/5539388> by ensuring that shadow offsets will get truncated

+ // to the desired integer.

+ static const CGFloat extraShadowOffset = narrowPrecisionToCGFloat(1.0 / 128);

+ if (width > 0)

+ width += extraShadowOffset;

+ else if (width < 0)

+ width -= extraShadowOffset;

+ if (height > 0)

+ height += extraShadowOffset;

+ else if (height < 0)

+ height -= extraShadowOffset;

+ return CGSizeMake(width, height);

+#endif

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = "";

+ applyShadow();

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = color;

+ applyShadow();

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float grayLevel)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = "";

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ RGBA32 rgba = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, 1.0f);

+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color, float alpha)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = color;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ RGBA32 rgba = 0; // default is transparent black

+ if (!state().m_shadowColor.isEmpty())

+ CSSParser::parseColor(rgba, state().m_shadowColor);

+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(colorWithOverrideAlpha(rgba, alpha)));

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float grayLevel, float alpha)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = "";

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ RGBA32 rgba = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, alpha);

+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float r, float g, float b, float a)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = "";

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ RGBA32 rgba = makeRGBA32FromFloats(r, g, b, a); // default is transparent black

+ if (!state().m_shadowColor.isEmpty())

+ CSSParser::parseColor(rgba, state().m_shadowColor);

+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, float c, float m, float y, float k, float a)

+ state().m_shadowOffset = FloatSize(width, height);

+ state().m_shadowBlur = blur;

+ state().m_shadowColor = "";

+ GraphicsContext* dc = drawingContext();

+ if (!dc)

+ return;

+#if PLATFORM(CG)

+ const CGFloat components[5] = { c, m, y, k, a };

+ CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceCMYK();

+ CGColorRef shadowColor = CGColorCreate(colorSpace, components);

+ CGColorSpaceRelease(colorSpace);

+ CGContextSetShadowWithColor(dc->platformContext(), adjustedShadowSize(width, -height), blur, shadowColor);

+ CGColorRelease(shadowColor);

+#else

+ dc->setShadow(IntSize(width, -height), blur, Color(c, m, y, k, a));

+#endif

+void CanvasRenderingContext2D::clearShadow()

+ state().m_shadowOffset = FloatSize();

+ state().m_shadowBlur = 0;

+ state().m_shadowColor = "";

+ applyShadow();

+void CanvasRenderingContext2D::applyShadow()

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ RGBA32 rgba = 0; // default is transparent black

+ if (!state().m_shadowColor.isEmpty())

+ CSSParser::parseColor(rgba, state().m_shadowColor);

+ float width = state().m_shadowOffset.width();

+ float height = state().m_shadowOffset.height();

+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, Color(rgba));

+static IntSize size(HTMLImageElement* image)

+ if (CachedImage* cachedImage = image->cachedImage())

+ return cachedImage->imageSize(1.0f); // FIXME: Not sure about this.

+ return IntSize();

+static inline FloatRect normalizeRect(const FloatRect& rect)

+ return FloatRect(min(rect.x(), rect.right()),

+ min(rect.y(), rect.bottom()),

+ max(rect.width(), -rect.width()),

+ max(rect.height(), -rect.height()));

+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, float x, float y)

+ ASSERT(image);

+ IntSize s = size(image);

+ ExceptionCode ec;

+ drawImage(image, x, y, s.width(), s.height(), ec);

+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image,

+ float x, float y, float width, float height, ExceptionCode& ec)

+ ASSERT(image);

+ IntSize s = size(image);

+ drawImage(image, FloatRect(0, 0, s.width(), s.height()), FloatRect(x, y, width, height), ec);

+void CanvasRenderingContext2D::checkOrigin(const KURL& url)

+ RefPtr<SecurityOrigin> origin = SecurityOrigin::create(url);

+ if (!m_canvas->document()->securityOrigin()->canAccess(origin.get()))

+ m_canvas->setOriginTainted();

+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, const FloatRect& srcRect, const FloatRect& dstRect,

+ ExceptionCode& ec)

+ ASSERT(image);

+ ec = 0;

+ FloatRect imageRect = FloatRect(FloatPoint(), size(image));

+ if (!imageRect.contains(normalizeRect(srcRect)) || srcRect.width() == 0 || srcRect.height() == 0) {

+ ec = INDEX_SIZE_ERR;

+ return;

+ }

+ if (!dstRect.width() || !dstRect.height())

+ return;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ CachedImage* cachedImage = image->cachedImage();

+ if (!cachedImage)

+ return;

+ if (m_canvas->originClean())

+ checkOrigin(cachedImage->response().url());

+ if (m_canvas->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())

+ m_canvas->setOriginTainted();

+ FloatRect sourceRect = c->roundToDevicePixels(srcRect);

+ FloatRect destRect = c->roundToDevicePixels(dstRect);

+ willDraw(destRect);

+ c->drawImage(cachedImage->image(), destRect, sourceRect, state().m_globalComposite);

+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas, float x, float y)

+ ASSERT(canvas);

+ ExceptionCode ec;

+ drawImage(canvas, x, y, canvas->width(), canvas->height(), ec);

+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas,

+ float x, float y, float width, float height, ExceptionCode& ec)

+ ASSERT(canvas);

+ drawImage(canvas, FloatRect(0, 0, canvas->width(), canvas->height()), FloatRect(x, y, width, height), ec);

+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas, const FloatRect& srcRect,

+ const FloatRect& dstRect, ExceptionCode& ec)

+ ASSERT(canvas);

+ ec = 0;

+ FloatRect srcCanvasRect = FloatRect(FloatPoint(), canvas->size());

+ if (!srcCanvasRect.contains(normalizeRect(srcRect)) || srcRect.width() == 0 || srcRect.height() == 0) {

+ ec = INDEX_SIZE_ERR;

+ return;

+ }

+ if (!dstRect.width() || !dstRect.height())

+ return;

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ FloatRect sourceRect = c->roundToDevicePixels(srcRect);

+ FloatRect destRect = c->roundToDevicePixels(dstRect);

+ // FIXME: Do this through platform-independent GraphicsContext API.

+ ImageBuffer* buffer = canvas->buffer();

+ if (!buffer)

+ return;

+ if (!canvas->originClean())

+ m_canvas->setOriginTainted();

+ c->drawImage(buffer->image(), destRect, sourceRect, state().m_globalComposite);

+ willDraw(destRect); // This call comes after drawImage, since the buffer we draw into may be our own, and we need to make sure it is dirty.

+ // FIXME: Arguably willDraw should become didDraw and occur after drawing calls and not before them to avoid problems like this.

+// FIXME: Why isn't this just another overload of drawImage? Why have a different name?

+void CanvasRenderingContext2D::drawImageFromRect(HTMLImageElement* image,

+ float sx, float sy, float sw, float sh,

+ float dx, float dy, float dw, float dh,

+ const String& compositeOperation)

+ if (!image)

+ return;

+ CachedImage* cachedImage = image->cachedImage();

+ if (!cachedImage)

+ return;

+ if (m_canvas->originClean())

+ checkOrigin(cachedImage->response().url());

+ if (m_canvas->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())

+ m_canvas->setOriginTainted();

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ CompositeOperator op;

+ if (!parseCompositeOperator(compositeOperation, op))

+ op = CompositeSourceOver;

+ FloatRect destRect = FloatRect(dx, dy, dw, dh);

+ willDraw(destRect);

+ c->drawImage(cachedImage->image(), destRect, FloatRect(sx, sy, sw, sh), op);

+void CanvasRenderingContext2D::setAlpha(float alpha)

+ setGlobalAlpha(alpha);

+void CanvasRenderingContext2D::setCompositeOperation(const String& operation)

+ setGlobalCompositeOperation(operation);

+PassRefPtr<CanvasGradient> CanvasRenderingContext2D::createLinearGradient(float x0, float y0, float x1, float y1, ExceptionCode& ec)

+ if (!isfinite(x0) || !isfinite(y0) || !isfinite(x1) || !isfinite(y1)) {

+ ec = NOT_SUPPORTED_ERR;

+ return 0;

+ }

+ return CanvasGradient::create(FloatPoint(x0, y0), FloatPoint(x1, y1));

+PassRefPtr<CanvasGradient> CanvasRenderingContext2D::createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionCode& ec)

+ if (!isfinite(x0) || !isfinite(y0) || !isfinite(r0) ||

+ !isfinite(x1) || !isfinite(y1) || !isfinite(r1)) {

+ ec = NOT_SUPPORTED_ERR;

+ return 0;

+ }

+ return CanvasGradient::create(FloatPoint(x0, y0), r0, FloatPoint(x1, y1), r1);

+PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLImageElement* image,

+ const String& repetitionType, ExceptionCode& ec)

+ bool repeatX, repeatY;

+ ec = 0;

+ CanvasPattern::parseRepetitionType(repetitionType, repeatX, repeatY, ec);

+ if (ec)

+ return 0;

+ if (!image->complete()) {

+ ec = INVALID_STATE_ERR;

+ return 0;

+ }

+ CachedImage* cachedImage = image->cachedImage();

+ if (!cachedImage || !image->cachedImage()->image())

+ return CanvasPattern::create(Image::nullImage(), repeatX, repeatY, true);

+ RefPtr<SecurityOrigin> origin = SecurityOrigin::createFromString(cachedImage->url());

+ bool originClean = m_canvas->document()->securityOrigin()->canAccess(origin.get());

+ return CanvasPattern::create(cachedImage->image(), repeatX, repeatY, originClean);

+PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLCanvasElement* canvas,

+ const String& repetitionType, ExceptionCode& ec)

+ if (!canvas->width() || !canvas->height()) {

+ ec = INVALID_STATE_ERR;

+ return 0;

+ }

+ bool repeatX, repeatY;

+ ec = 0;

+ CanvasPattern::parseRepetitionType(repetitionType, repeatX, repeatY, ec);

+ if (ec)

+ return 0;

+ return CanvasPattern::create(canvas->buffer()->image(), repeatX, repeatY, canvas->originClean());

+void CanvasRenderingContext2D::willDraw(const FloatRect& r, unsigned options)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ FloatRect dirtyRect = r;

+ if (options & CanvasWillDrawApplyTransform) {

+ TransformationMatrix ctm = state().m_transform;

+ dirtyRect = ctm.mapRect(r);

+ }

+ if (options & CanvasWillDrawApplyShadow) {

+ // The shadow gets applied after transformation

+ FloatRect shadowRect(dirtyRect);

+ shadowRect.move(state().m_shadowOffset);

+ shadowRect.inflate(state().m_shadowBlur);

+ dirtyRect.unite(shadowRect);

+ }

+ if (options & CanvasWillDrawApplyClip) {

+ // 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.

+ }

+ m_canvas->willDraw(dirtyRect);

+GraphicsContext* CanvasRenderingContext2D::drawingContext() const

+ return m_canvas->drawingContext();

+static PassRefPtr<ImageData> createEmptyImageData(const IntSize& size)

+ RefPtr<ImageData> data = ImageData::create(size.width(), size.height());

+ memset(data->data()->data()->data(), 0, data->data()->data()->length());

+ return data.get();

+PassRefPtr<ImageData> CanvasRenderingContext2D::createImageData(float sw, float sh) const

+ FloatSize unscaledSize(sw, sh);

+ IntSize scaledSize = m_canvas->convertLogicalToDevice(unscaledSize);

+ if (scaledSize.width() < 1)

+ scaledSize.setWidth(1);

+ if (scaledSize.height() < 1)

+ scaledSize.setHeight(1);

+ return createEmptyImageData(scaledSize);

+PassRefPtr<ImageData> CanvasRenderingContext2D::getImageData(float sx, float sy, float sw, float sh, ExceptionCode& ec) const

+ if (!m_canvas->originClean()) {

+ ec = SECURITY_ERR;

+ return 0;

+ }

+ FloatRect unscaledRect(sx, sy, sw, sh);

+ IntRect scaledRect = m_canvas->convertLogicalToDevice(unscaledRect);

+ if (scaledRect.width() < 1)

+ scaledRect.setWidth(1);

+ if (scaledRect.height() < 1)

+ scaledRect.setHeight(1);

+ ImageBuffer* buffer = m_canvas ? m_canvas->buffer() : 0;

+ if (!buffer)

+ return createEmptyImageData(scaledRect.size());

+ return buffer->getImageData(scaledRect);

+void CanvasRenderingContext2D::putImageData(ImageData* data, float dx, float dy, ExceptionCode& ec)

+ if (!data) {

+ ec = TYPE_MISMATCH_ERR;

+ return;

+ }

+ putImageData(data, dx, dy, 0, 0, data->width(), data->height(), ec);

+void CanvasRenderingContext2D::putImageData(ImageData* data, float dx, float dy, float dirtyX, float dirtyY,

+ float dirtyWidth, float dirtyHeight, ExceptionCode& ec)

+ if (!data) {

+ ec = TYPE_MISMATCH_ERR;

+ return;

+ }

+ if (!isfinite(dx) || !isfinite(dy) || !isfinite(dirtyX) ||

+ !isfinite(dirtyY) || !isfinite(dirtyWidth) || !isfinite(dirtyHeight)) {

+ ec = INDEX_SIZE_ERR;

+ return;

+ }

+ ImageBuffer* buffer = m_canvas->buffer();

+ if (!buffer)

+ 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 sourceRect = enclosingIntRect(clipRect);

+ sourceRect.move(destOffset);

+ sourceRect.intersect(IntRect(IntPoint(), buffer->size()));

+ if (sourceRect.isEmpty())

+ return;

+ willDraw(sourceRect, 0); // ignore transform, shadow and clip

+ sourceRect.move(-destOffset);

+ IntPoint destPoint(destOffset.width(), destOffset.height());

+ buffer->putImageData(data, sourceRect, destPoint);

+String CanvasRenderingContext2D::font() const

+ return state().m_unparsedFont;

+void CanvasRenderingContext2D::setFont(const String& newFont)

+ RefPtr<CSSMutableStyleDeclaration> tempDecl = CSSMutableStyleDeclaration::create();

+ CSSParser parser(!m_canvas->document()->inCompatMode()); // Use the parse mode of the canvas' document when parsing CSS.

+ String declarationText("font: ");

+ declarationText += newFont;

+ parser.parseDeclaration(tempDecl.get(), declarationText);

+ if (!tempDecl->length())

+ return;

+ // The parse succeeded.

+ state().m_unparsedFont = newFont;

+ // Map the <canvas> font into the text style. If the font uses keywords like larger/smaller, these will work

+ // relative to the canvas.

+ RefPtr<RenderStyle> newStyle = RenderStyle::create();

+ if (m_canvas->computedStyle())

+ newStyle->setFontDescription(m_canvas->computedStyle()->fontDescription());

+ // Now map the font property into the style.

+ CSSStyleSelector* styleSelector = m_canvas->document()->styleSelector();

+ styleSelector->applyPropertyToStyle(CSSPropertyFont, tempDecl->getPropertyCSSValue(CSSPropertyFont).get(), newStyle.get());

+ state().m_font = newStyle->font();

+ state().m_font.update(styleSelector->fontSelector());

+ state().m_realizedFont = true;

+String CanvasRenderingContext2D::textAlign() const

+ return textAlignName(state().m_textAlign);

+void CanvasRenderingContext2D::setTextAlign(const String& s)

+ TextAlign align;

+ if (!parseTextAlign(s, align))

+ return;

+ state().m_textAlign = align;

+String CanvasRenderingContext2D::textBaseline() const

+ return textBaselineName(state().m_textBaseline);

+void CanvasRenderingContext2D::setTextBaseline(const String& s)

+ TextBaseline baseline;

+ if (!parseTextBaseline(s, baseline))

+ return;

+ state().m_textBaseline = baseline;

+void CanvasRenderingContext2D::fillText(const String& text, float x, float y)

+ drawTextInternal(text, x, y, true);

+void CanvasRenderingContext2D::fillText(const String& text, float x, float y, float maxWidth)

+ drawTextInternal(text, x, y, true, maxWidth, true);

+void CanvasRenderingContext2D::strokeText(const String& text, float x, float y)

+ drawTextInternal(text, x, y, false);

+void CanvasRenderingContext2D::strokeText(const String& text, float x, float y, float maxWidth)

+ drawTextInternal(text, x, y, false, maxWidth, true);

+PassRefPtr<TextMetrics> CanvasRenderingContext2D::measureText(const String& text)

+ RefPtr<TextMetrics> metrics = TextMetrics::create();

+ metrics->setWidth(accessFont().width(TextRun(text.characters(), text.length())));

+ return metrics;

+void CanvasRenderingContext2D::drawTextInternal(const String& text, float x, float y, bool fill, float /*maxWidth*/, bool /*useMaxWidth*/)

+ GraphicsContext* c = drawingContext();

+ if (!c)

+ return;

+ if (!state().m_invertibleCTM)

+ return;

+ const Font& font = accessFont();

+ // FIXME: Handle maxWidth.

+ // FIXME: Need to turn off font smoothing.

+ bool rtl = m_canvas->computedStyle() ? m_canvas->computedStyle()->direction() == RTL : false;

+ bool override = m_canvas->computedStyle() ? m_canvas->computedStyle()->unicodeBidi() == Override : false;

+ unsigned length = text.length();

+ const UChar* string = text.characters();

+ TextRun textRun(string, length, 0, 0, 0, rtl, override, false, false);

+ // Draw the item text at the correct point.

+ FloatPoint location(x, y);

+ switch (state().m_textBaseline) {

+ case TopTextBaseline:

+ case HangingTextBaseline:

+ location.setY(y + font.ascent());

+ break;

+ case BottomTextBaseline:

+ case IdeographicTextBaseline:

+ location.setY(y - font.descent());

+ break;

+ case MiddleTextBaseline:

+ location.setY(y - font.descent() + font.height() / 2);

+ break;

+ case AlphabeticTextBaseline:

+ default:

+ // Do nothing.

+ break;

+ }

+ float width = font.width(TextRun(text, false, 0, 0, rtl, override));

+ TextAlign align = state().m_textAlign;

+ if (align == StartTextAlign)

+ align = rtl ? RightTextAlign : LeftTextAlign;

+ else if (align == EndTextAlign)

+ align = rtl ? LeftTextAlign : RightTextAlign;

+ switch (align) {

+ case CenterTextAlign:

+ location.setX(location.x() - width / 2);

+ break;

+ case RightTextAlign:

+ location.setX(location.x() - width);

+ break;

+ default:

+ break;

+ }

+ // The slop built in to this mask rect matches the heuristic used in FontCGWin.cpp for GDI text.

+ FloatRect textRect = FloatRect(location.x() - font.height() / 2, location.y() - font.ascent() - font.lineGap(),

+ width + font.height(), font.lineSpacing());

+ if (!fill)

+ textRect.inflate(c->strokeThickness() / 2);

+ if (fill)

+ m_canvas->willDraw(textRect);

+ else {

+ // When stroking text, pointy miters can extend outside of textRect, so we

+ // punt and dirty the whole canvas.

+ m_canvas->willDraw(FloatRect(0, 0, m_canvas->width(), m_canvas->height()));

+ }

+ CanvasStyle* drawStyle = fill ? state().m_fillStyle.get() : state().m_strokeStyle.get();

+ if (drawStyle->canvasGradient() || drawStyle->canvasPattern()) {

+ // FIXME: The rect is not big enough for miters on stroked text.

+ IntRect maskRect = enclosingIntRect(textRect);

+ auto_ptr<ImageBuffer> maskImage = ImageBuffer::create(maskRect.size(), false);

+ GraphicsContext* maskImageContext = maskImage->context();

+ if (fill)

+ maskImageContext->setFillColor(Color::black);

+ else {

+ maskImageContext->setStrokeColor(Color::black);

+ maskImageContext->setStrokeThickness(c->strokeThickness());

+ }

+ maskImageContext->setTextDrawingMode(fill ? cTextFill : cTextStroke);

+ maskImageContext->translate(-maskRect.x(), -maskRect.y());

+ maskImageContext->drawBidiText(font, textRun, location);

+ c->save();

+ c->clipToImageBuffer(maskRect, maskImage.get());

+ drawStyle->applyFillColor(c);

+ c->fillRect(maskRect);

+ c->restore();

+ return;

+ }

+ c->setTextDrawingMode(fill ? cTextFill : cTextStroke);

+ c->drawBidiText(font, textRun, location);

+const Font& CanvasRenderingContext2D::accessFont()

+ if (!state().m_realizedFont)

+ setFont(state().m_unparsedFont);

+ return state().m_font;

+} // namespace WebCore

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