--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/CanvasRenderingContext2D.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,1756 @@
+/*
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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.
+ *
+ * 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 "AffineTransform.h"
+#include "CSSParser.h"
+#include "CachedImage.h"
+#include "CanvasGradient.h"
+#include "CanvasPattern.h"
+#include "CanvasStyle.h"
+#include "CSSMutableStyleDeclaration.h"
+#include "CSSPropertyNames.h"
+#include "CSSStyleSelector.h"
+#include "ExceptionCode.h"
+#include "FloatConversion.h"
+#include "GraphicsContext.h"
+#include "HTMLCanvasElement.h"
+#include "HTMLImageElement.h"
+#include "HTMLMediaElement.h"
+#include "HTMLNames.h"
+#include "ImageBuffer.h"
+#include "ImageData.h"
+#include "KURL.h"
+#include "Page.h"
+#include "RenderHTMLCanvas.h"
+#include "SecurityOrigin.h"
+#include "Settings.h"
+#include "StrokeStyleApplier.h"
+#include "TextMetrics.h"
+#include "HTMLVideoElement.h"
+#include <stdio.h>
+#include <wtf/ByteArray.h>
+#include <wtf/MathExtras.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/UnusedParam.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, 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
+
+ // Make sure that even if the drawingContext() has a different default
+ // thickness, it is in sync with the canvas thickness.
+ setLineWidth(lineWidth());
+}
+
+CanvasRenderingContext2D::~CanvasRenderingContext2D()
+{
+}
+
+void CanvasRenderingContext2D::reset()
+{
+ m_stateStack.resize(1);
+ m_stateStack.first() = State();
+ m_path.clear();
+}
+
+CanvasRenderingContext2D::State::State()
+ : m_strokeStyle(CanvasStyle::create(Color::black))
+ , m_fillStyle(CanvasStyle::create(Color::black))
+ , m_lineWidth(1)
+ , m_lineCap(ButtCap)
+ , m_lineJoin(MiterJoin)
+ , m_miterLimit(10)
+ , m_shadowBlur(0)
+ , m_shadowColor(Color::transparent)
+ , 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 (state().m_strokeStyle && state().m_strokeStyle->isEquivalentColor(*style))
+ return;
+
+ if (canvas()->originClean()) {
+ if (CanvasPattern* pattern = style->canvasPattern()) {
+ if (!pattern->originClean())
+ canvas()->setOriginTainted();
+ }
+ }
+
+ state().m_strokeStyle = style;
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+ state().m_strokeStyle->applyStrokeColor(c);
+ state().m_unparsedStrokeColor = String();
+}
+
+CanvasStyle* CanvasRenderingContext2D::fillStyle() const
+{
+ return state().m_fillStyle.get();
+}
+
+void CanvasRenderingContext2D::setFillStyle(PassRefPtr<CanvasStyle> style)
+{
+ if (!style)
+ return;
+
+ if (state().m_fillStyle && state().m_fillStyle->isEquivalentColor(*style))
+ return;
+
+ if (canvas()->originClean()) {
+ if (CanvasPattern* pattern = style->canvasPattern()) {
+ if (!pattern->originClean())
+ canvas()->setOriginTainted();
+ }
+ }
+
+ state().m_fillStyle = style;
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+ state().m_fillStyle->applyFillColor(c);
+ state().m_unparsedFillColor = String();
+}
+
+float CanvasRenderingContext2D::lineWidth() const
+{
+ return state().m_lineWidth;
+}
+
+void CanvasRenderingContext2D::setLineWidth(float width)
+{
+ if (!(isfinite(width) && 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 (!(isfinite(limit) && 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)
+{
+ if (!isfinite(x))
+ return;
+ state().m_shadowOffset.setWidth(x);
+ applyShadow();
+}
+
+float CanvasRenderingContext2D::shadowOffsetY() const
+{
+ return state().m_shadowOffset.height();
+}
+
+void CanvasRenderingContext2D::setShadowOffsetY(float y)
+{
+ if (!isfinite(y))
+ return;
+ state().m_shadowOffset.setHeight(y);
+ applyShadow();
+}
+
+float CanvasRenderingContext2D::shadowBlur() const
+{
+ return state().m_shadowBlur;
+}
+
+void CanvasRenderingContext2D::setShadowBlur(float blur)
+{
+ if (!(isfinite(blur) && blur >= 0))
+ return;
+ state().m_shadowBlur = blur;
+ applyShadow();
+}
+
+String CanvasRenderingContext2D::shadowColor() const
+{
+ return Color(state().m_shadowColor).serialized();
+}
+
+void CanvasRenderingContext2D::setShadowColor(const String& color)
+{
+ if (!CSSParser::parseColor(state().m_shadowColor, color))
+ return;
+
+ 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;
+
+ if (!isfinite(sx) | !isfinite(sy))
+ return;
+
+ AffineTransform newTransform = state().m_transform;
+ newTransform.scaleNonUniform(sx, sy);
+ if (!newTransform.isInvertible()) {
+ state().m_invertibleCTM = false;
+ return;
+ }
+
+ state().m_transform = newTransform;
+ c->scale(FloatSize(sx, sy));
+ m_path.transform(AffineTransform().scaleNonUniform(1.0 / sx, 1.0 / sy));
+}
+
+void CanvasRenderingContext2D::rotate(float angleInRadians)
+{
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+ if (!state().m_invertibleCTM)
+ return;
+
+ if (!isfinite(angleInRadians))
+ return;
+
+ AffineTransform 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(AffineTransform().rotate(-angleInRadians / piDouble * 180.0));
+}
+
+void CanvasRenderingContext2D::translate(float tx, float ty)
+{
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+ if (!state().m_invertibleCTM)
+ return;
+
+ if (!isfinite(tx) | !isfinite(ty))
+ return;
+
+ AffineTransform 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(AffineTransform().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;
+
+ if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |
+ !isfinite(m12) | !isfinite(m22) | !isfinite(dy))
+ return;
+
+ AffineTransform transform(m11, m12, m21, m22, dx, dy);
+ AffineTransform 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;
+
+ if (!isfinite(m11) | !isfinite(m21) | !isfinite(dx) |
+ !isfinite(m12) | !isfinite(m22) | !isfinite(dy))
+ return;
+
+ AffineTransform ctm = state().m_transform;
+ if (!ctm.isInvertible())
+ return;
+ c->concatCTM(c->getCTM().inverse());
+ c->concatCTM(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)
+{
+ if (color == state().m_unparsedStrokeColor)
+ return;
+ setStrokeStyle(CanvasStyle::create(color));
+ state().m_unparsedStrokeColor = 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)
+{
+ if (color == state().m_unparsedFillColor)
+ return;
+ setFillStyle(CanvasStyle::create(color));
+ state().m_unparsedFillColor = 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()
+{
+ if (m_path.isEmpty())
+ return;
+
+ FloatRect boundRect = m_path.boundingRect();
+ if (boundRect.width() || boundRect.height())
+ 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;
+
+ FloatPoint p1 = FloatPoint(x, y);
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(p1);
+ else if (p1 != m_path.currentPoint())
+ 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;
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(FloatPoint(cpx, cpy));
+
+ FloatPoint p1 = FloatPoint(x, y);
+ if (p1 != m_path.currentPoint())
+ m_path.addQuadCurveTo(FloatPoint(cpx, cpy), p1);
+}
+
+void CanvasRenderingContext2D::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y)
+{
+ if (!isfinite(cp1x) | !isfinite(cp1y) | !isfinite(cp2x) | !isfinite(cp2y) | !isfinite(x) | !isfinite(y))
+ return;
+ if (!state().m_invertibleCTM)
+ return;
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(FloatPoint(cp1x, cp1y));
+
+ FloatPoint p1 = FloatPoint(x, y);
+ if (p1 != m_path.currentPoint())
+ m_path.addBezierCurveTo(FloatPoint(cp1x, cp1y), FloatPoint(cp2x, cp2y), p1);
+}
+
+void CanvasRenderingContext2D::arcTo(float x1, float y1, float x2, float y2, float r, ExceptionCode& ec)
+{
+ ec = 0;
+ if (!isfinite(x1) | !isfinite(y1) | !isfinite(x2) | !isfinite(y2) | !isfinite(r))
+ return;
+
+ if (r < 0) {
+ ec = INDEX_SIZE_ERR;
+ return;
+ }
+
+ if (!state().m_invertibleCTM)
+ return;
+
+ FloatPoint p1 = FloatPoint(x1, y1);
+ FloatPoint p2 = FloatPoint(x2, y2);
+
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(p1);
+ else if (p1 == m_path.currentPoint() || p1 == p2 || !r)
+ lineTo(x1, y1);
+ else
+ m_path.addArcTo(p1, p2, 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 (sa == ea)
+ 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 && !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 (!state().m_invertibleCTM)
+ return;
+
+ if (!isfinite(x) || !isfinite(y) || !isfinite(width) || !isfinite(height))
+ return;
+
+ if (!width && !height) {
+ m_path.moveTo(FloatPoint(x, y));
+ return;
+ }
+
+ if (width < 0) {
+ width = -width;
+ x -= width;
+ }
+
+ if (height < 0) {
+ height = -height;
+ y -= height;
+ }
+
+ m_path.addRect(FloatRect(x, y, width, height));
+}
+
+#if ENABLE(DASHBOARD_SUPPORT)
+void CanvasRenderingContext2D::clearPathForDashboardBackwardCompatibilityMode()
+{
+ if (m_usesDashboardCompatibilityMode)
+ 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->canvasClip(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);
+ AffineTransform 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;
+
+ // 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
+ Gradient* gradient = c->fillGradient();
+ if (gradient && gradient->isZeroSize())
+ return;
+
+ FloatRect rect(x, y, width, height);
+ willDraw(rect);
+
+ c->fillRect(rect);
+}
+
+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 = Color::transparent;
+ applyShadow();
+}
+
+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color)
+{
+ if (!CSSParser::parseColor(state().m_shadowColor, color))
+ return;
+
+ state().m_shadowOffset = FloatSize(width, height);
+ state().m_shadowBlur = blur;
+ 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 = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, 1.0f);
+
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+
+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, state().m_shadowColor, DeviceColorSpace);
+}
+
+void CanvasRenderingContext2D::setShadow(float width, float height, float blur, const String& color, float alpha)
+{
+ RGBA32 rgba;
+
+ if (!CSSParser::parseColor(rgba, color))
+ return;
+
+ state().m_shadowColor = colorWithOverrideAlpha(rgba, alpha);
+ state().m_shadowOffset = FloatSize(width, height);
+ state().m_shadowBlur = blur;
+
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+
+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, state().m_shadowColor, DeviceColorSpace);
+}
+
+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 = makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, alpha);
+
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+
+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, state().m_shadowColor, DeviceColorSpace);
+}
+
+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 = makeRGBA32FromFloats(r, g, b, a);
+
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+
+ c->setShadow(IntSize(width, -height), state().m_shadowBlur, state().m_shadowColor, DeviceColorSpace);
+}
+
+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 = makeRGBAFromCMYKA(c, m, y, k, a);
+
+ 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, state().m_shadowColor, DeviceColorSpace);
+#endif
+}
+
+void CanvasRenderingContext2D::clearShadow()
+{
+ state().m_shadowOffset = FloatSize();
+ state().m_shadowBlur = 0;
+ state().m_shadowColor = Color::transparent;
+ applyShadow();
+}
+
+void CanvasRenderingContext2D::applyShadow()
+{
+ GraphicsContext* c = drawingContext();
+ if (!c)
+ return;
+
+ float width = state().m_shadowOffset.width();
+ float height = state().m_shadowOffset.height();
+ c->setShadow(FloatSize(width, -height), state().m_shadowBlur, state().m_shadowColor, DeviceColorSpace);
+}
+
+static IntSize size(HTMLImageElement* image)
+{
+ if (CachedImage* cachedImage = image->cachedImage())
+ return cachedImage->imageSize(1.0f); // FIXME: Not sure about this.
+ return IntSize();
+}
+
+#if ENABLE(VIDEO)
+static IntSize size(HTMLVideoElement* video)
+{
+ if (MediaPlayer* player = video->player())
+ return player->naturalSize();
+ return IntSize();
+}
+#endif
+
+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::checkOrigin(const KURL& url)
+{
+ if (m_cleanOrigins.contains(url.string()))
+ return;
+
+ if (canvas()->securityOrigin().taintsCanvas(url))
+ canvas()->setOriginTainted();
+ else
+ m_cleanOrigins.add(url.string());
+}
+
+void CanvasRenderingContext2D::checkOrigin(const String& url)
+{
+ if (m_cleanOrigins.contains(url))
+ return;
+
+ checkOrigin(KURL(KURL(), url));
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, float x, float y, ExceptionCode& ec)
+{
+ if (!image) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ IntSize s = size(image);
+ drawImage(image, x, y, s.width(), s.height(), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image,
+ float x, float y, float width, float height, ExceptionCode& ec)
+{
+ if (!image) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ IntSize s = size(image);
+ drawImage(image, FloatRect(0, 0, s.width(), s.height()), FloatRect(x, y, width, height), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image,
+ float sx, float sy, float sw, float sh,
+ float dx, float dy, float dw, float dh, ExceptionCode& ec)
+{
+ if (!image) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ drawImage(image, FloatRect(sx, sy, sw, sh), FloatRect(dx, dy, dw, dh), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLImageElement* image, const FloatRect& srcRect, const FloatRect& dstRect,
+ ExceptionCode& ec)
+{
+ if (!image) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+
+ ec = 0;
+
+ if (!isfinite(dstRect.x()) || !isfinite(dstRect.y()) || !isfinite(dstRect.width()) || !isfinite(dstRect.height())
+ || !isfinite(srcRect.x()) || !isfinite(srcRect.y()) || !isfinite(srcRect.width()) || !isfinite(srcRect.height()))
+ return;
+
+ if (!image->complete())
+ return;
+
+ 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 (canvas()->originClean())
+ checkOrigin(cachedImage->response().url());
+
+ if (canvas()->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())
+ canvas()->setOriginTainted();
+
+ FloatRect sourceRect = c->roundToDevicePixels(srcRect);
+ FloatRect destRect = c->roundToDevicePixels(dstRect);
+ willDraw(destRect);
+ c->drawImage(cachedImage->image(), DeviceColorSpace, destRect, sourceRect, state().m_globalComposite);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas, float x, float y, ExceptionCode& ec)
+{
+ if (!canvas) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ drawImage(canvas, x, y, canvas->width(), canvas->height(), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas,
+ float x, float y, float width, float height, ExceptionCode& ec)
+{
+ if (!canvas) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ drawImage(canvas, FloatRect(0, 0, canvas->width(), canvas->height()), FloatRect(x, y, width, height), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* canvas,
+ float sx, float sy, float sw, float sh,
+ float dx, float dy, float dw, float dh, ExceptionCode& ec)
+{
+ drawImage(canvas, FloatRect(sx, sy, sw, sh), FloatRect(dx, dy, dw, dh), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLCanvasElement* sourceCanvas, const FloatRect& srcRect,
+ const FloatRect& dstRect, ExceptionCode& ec)
+{
+ if (!sourceCanvas) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+
+ FloatRect srcCanvasRect = FloatRect(FloatPoint(), sourceCanvas->size());
+
+ if (!srcCanvasRect.width() || !srcCanvasRect.height()) {
+ ec = INVALID_STATE_ERR;
+ return;
+ }
+
+ if (!srcCanvasRect.contains(normalizeRect(srcRect)) || srcRect.width() == 0 || srcRect.height() == 0) {
+ ec = INDEX_SIZE_ERR;
+ return;
+ }
+
+ ec = 0;
+
+ 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 = sourceCanvas->buffer();
+ if (!buffer)
+ return;
+
+ if (!sourceCanvas->originClean())
+ canvas()->setOriginTainted();
+
+ sourceCanvas->makeRenderingResultsAvailable();
+
+ c->drawImage(buffer->image(), DeviceColorSpace, 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.
+}
+
+#if ENABLE(VIDEO)
+void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video, float x, float y, ExceptionCode& ec)
+{
+ if (!video) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ IntSize s = size(video);
+ drawImage(video, x, y, s.width(), s.height(), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video,
+ float x, float y, float width, float height, ExceptionCode& ec)
+{
+ if (!video) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+ IntSize s = size(video);
+ drawImage(video, FloatRect(0, 0, s.width(), s.height()), FloatRect(x, y, width, height), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video,
+ float sx, float sy, float sw, float sh,
+ float dx, float dy, float dw, float dh, ExceptionCode& ec)
+{
+ drawImage(video, FloatRect(sx, sy, sw, sh), FloatRect(dx, dy, dw, dh), ec);
+}
+
+void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video, const FloatRect& srcRect, const FloatRect& dstRect,
+ ExceptionCode& ec)
+{
+ if (!video) {
+ ec = TYPE_MISMATCH_ERR;
+ return;
+ }
+
+ ec = 0;
+
+ if (video->readyState() == HTMLMediaElement::HAVE_NOTHING || video->readyState() == HTMLMediaElement::HAVE_METADATA)
+ return;
+
+ FloatRect videoRect = FloatRect(FloatPoint(), size(video));
+ if (!videoRect.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;
+
+ if (canvas()->originClean())
+ checkOrigin(video->currentSrc());
+
+ if (canvas()->originClean() && !video->hasSingleSecurityOrigin())
+ canvas()->setOriginTainted();
+
+ FloatRect sourceRect = c->roundToDevicePixels(srcRect);
+ FloatRect destRect = c->roundToDevicePixels(dstRect);
+ willDraw(destRect);
+
+ c->save();
+ c->clip(destRect);
+ c->translate(destRect.x(), destRect.y());
+ c->scale(FloatSize(destRect.width()/sourceRect.width(), destRect.height()/sourceRect.height()));
+ c->translate(-sourceRect.x(), -sourceRect.y());
+ video->paintCurrentFrameInContext(c, IntRect(IntPoint(), size(video)));
+ c->restore();
+}
+#endif
+
+// 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 (canvas()->originClean())
+ checkOrigin(cachedImage->response().url());
+
+ if (canvas()->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())
+ 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(), DeviceColorSpace, destRect, FloatRect(sx, sy, sw, sh), op);
+}
+
+void CanvasRenderingContext2D::setAlpha(float alpha)
+{
+ setGlobalAlpha(alpha);
+}
+
+void CanvasRenderingContext2D::setCompositeOperation(const String& operation)
+{
+ setGlobalCompositeOperation(operation);
+}
+
+void CanvasRenderingContext2D::prepareGradientForDashboard(CanvasGradient* gradient) const
+{
+#if ENABLE(DASHBOARD_SUPPORT)
+ if (m_usesDashboardCompatibilityMode)
+ gradient->setDashboardCompatibilityMode();
+#else
+ UNUSED_PARAM(gradient);
+#endif
+}
+
+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;
+ }
+
+ PassRefPtr<CanvasGradient> gradient = CanvasGradient::create(FloatPoint(x0, y0), FloatPoint(x1, y1));
+ prepareGradientForDashboard(gradient.get());
+ return gradient;
+}
+
+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;
+ }
+ PassRefPtr<CanvasGradient> gradient = CanvasGradient::create(FloatPoint(x0, y0), r0, FloatPoint(x1, y1), r1);
+ prepareGradientForDashboard(gradient.get());
+ return gradient;
+}
+
+PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLImageElement* image,
+ const String& repetitionType, ExceptionCode& ec)
+{
+ if (!image) {
+ ec = TYPE_MISMATCH_ERR;
+ return 0;
+ }
+ bool repeatX, repeatY;
+ ec = 0;
+ CanvasPattern::parseRepetitionType(repetitionType, repeatX, repeatY, ec);
+ if (ec)
+ return 0;
+
+ if (!image->complete())
+ return 0;
+
+ CachedImage* cachedImage = image->cachedImage();
+ if (!cachedImage || !image->cachedImage()->image())
+ return CanvasPattern::create(Image::nullImage(), repeatX, repeatY, true);
+
+ bool originClean = !canvas()->securityOrigin().taintsCanvas(KURL(KURL(), cachedImage->url())) && cachedImage->image()->hasSingleSecurityOrigin();
+ return CanvasPattern::create(cachedImage->image(), repeatX, repeatY, originClean);
+}
+
+PassRefPtr<CanvasPattern> CanvasRenderingContext2D::createPattern(HTMLCanvasElement* canvas,
+ const String& repetitionType, ExceptionCode& ec)
+{
+ if (!canvas) {
+ ec = TYPE_MISMATCH_ERR;
+ return 0;
+ }
+ 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) {
+ AffineTransform ctm = state().m_transform;
+ dirtyRect = ctm.mapRect(r);
+ }
+
+ if (options & CanvasWillDrawApplyShadow && alphaChannel(state().m_shadowColor)) {
+ // 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.
+ }
+
+ canvas()->willDraw(dirtyRect);
+}
+
+GraphicsContext* CanvasRenderingContext2D::drawingContext() const
+{
+ return 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(PassRefPtr<ImageData> imageData, ExceptionCode& ec) const
+{
+ if (!imageData) {
+ ec = NOT_SUPPORTED_ERR;
+ return 0;
+ }
+
+ IntSize size(imageData->width(), imageData->height());
+ return createEmptyImageData(size);
+}
+
+PassRefPtr<ImageData> CanvasRenderingContext2D::createImageData(float sw, float sh, ExceptionCode& ec) const
+{
+ ec = 0;
+ if (!sw || !sh) {
+ ec = INDEX_SIZE_ERR;
+ return 0;
+ }
+ if (!isfinite(sw) || !isfinite(sh)) {
+ ec = NOT_SUPPORTED_ERR;
+ return 0;
+ }
+
+ FloatSize unscaledSize(fabs(sw), fabs(sh));
+ IntSize scaledSize = 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 (!canvas()->originClean()) {
+ ec = SECURITY_ERR;
+ return 0;
+ }
+ if (!sw || !sh) {
+ ec = INDEX_SIZE_ERR;
+ return 0;
+ }
+ if (!isfinite(sx) || !isfinite(sy) || !isfinite(sw) || !isfinite(sh)) {
+ ec = NOT_SUPPORTED_ERR;
+ return 0;
+ }
+
+ FloatRect unscaledRect(sx, sy, sw, sh);
+ IntRect scaledRect = canvas()->convertLogicalToDevice(unscaledRect);
+ if (scaledRect.width() < 1)
+ scaledRect.setWidth(1);
+ if (scaledRect.height() < 1)
+ scaledRect.setHeight(1);
+ ImageBuffer* buffer = canvas() ? canvas()->buffer() : 0;
+ if (!buffer)
+ return createEmptyImageData(scaledRect.size());
+ return buffer->getUnmultipliedImageData(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 = NOT_SUPPORTED_ERR;
+ return;
+ }
+
+ ImageBuffer* buffer = 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->putUnmultipliedImageData(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_usesCSSCompatibilityParseMode);
+
+ 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 (RenderStyle* computedStyle = canvas()->computedStyle())
+ newStyle->setFontDescription(computedStyle->fontDescription());
+
+ // Now map the font property into the style.
+ CSSStyleSelector* styleSelector = canvas()->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;
+}
+
+void CanvasRenderingContext2D::updateFont()
+{
+ if (!state().m_realizedFont)
+ return;
+
+ const Font& font = state().m_font;
+ font.update(font.fontSelector());
+}
+
+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.
+
+ RenderStyle* computedStyle = canvas()->computedStyle();
+ bool rtl = computedStyle ? computedStyle->direction() == RTL : false;
+ bool override = computedStyle ? 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)
+ canvas()->willDraw(textRect);
+ else {
+ // When stroking text, pointy miters can extend outside of textRect, so we
+ // punt and dirty the whole canvas.
+ canvas()->willDraw(FloatRect(0, 0, canvas()->width(), canvas()->height()));
+ }
+
+#if PLATFORM(CG)
+ 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);
+
+ OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(maskRect.size());
+
+ GraphicsContext* maskImageContext = maskImage->context();
+
+ if (fill)
+ maskImageContext->setFillColor(Color::black, DeviceColorSpace);
+ else {
+ maskImageContext->setStrokeColor(Color::black, DeviceColorSpace);
+ 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;
+ }
+#endif
+
+ 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