blob: 52b8a73e39409038f8ef972873a19a478c50d7bd [file] [log] [blame]
/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2008 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>
*
* 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 "CSSMutableStyleDeclaration.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 "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)
: m_canvas(canvas)
, m_stateStack(1)
{
// Make sure that even if the drawingContext() has a different default
// thickness, it is in sync with the canvas thickness.
setLineWidth(lineWidth());
}
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.scaleNonUniform(sx, sy);
if (!newTransform.isInvertible()) {
state().m_invertibleCTM = false;
return;
}
state().m_transform = newTransform;
c->scale(FloatSize(sx, sy));
m_path.transform(TransformationMatrix().scaleNonUniform(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)
{
if (!isfinite(cp1x) | !isfinite(cp1y) | !isfinite(cp2x) | !isfinite(cp2y) | !isfinite(x) | !isfinite(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();
}
#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)
{
RefPtr<SecurityOrigin> origin = SecurityOrigin::create(url);
if (!m_canvas->document()->securityOrigin()->canAccess(origin.get()))
m_canvas->setOriginTainted();
}
void CanvasRenderingContext2D::checkOrigin(const String& url)
{
RefPtr<SecurityOrigin> origin = SecurityOrigin::createFromString(url);
if (!m_canvas->document()->securityOrigin()->canAccess(origin.get()))
m_canvas->setOriginTainted();
}
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::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.
}
#if ENABLE(VIDEO)
void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video, float x, float y)
{
ASSERT(video);
IntSize s = size(video);
ExceptionCode ec;
drawImage(video, x, y, s.width(), s.height(), ec);
}
void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video,
float x, float y, float width, float height, ExceptionCode& ec)
{
ASSERT(video);
IntSize s = size(video);
drawImage(video, FloatRect(0, 0, s.width(), s.height()), FloatRect(x, y, width, height), ec);
}
void CanvasRenderingContext2D::drawImage(HTMLVideoElement* video, const FloatRect& srcRect, const FloatRect& dstRect,
ExceptionCode& ec)
{
ASSERT(video);
ec = 0;
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 (m_canvas->originClean())
checkOrigin(video->currentSrc());
if (m_canvas->originClean() && !video->hasSingleSecurityOrigin())
m_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 (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);
}
void CanvasRenderingContext2D::prepareGradientForDashboard(CanvasGradient* gradient) const
{
#if ENABLE(DASHBOARD_SUPPORT)
if (Settings* settings = m_canvas->document()->settings())
if (settings->usesDashboardBackwardCompatibilityMode())
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)
{
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()));
}
#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(), 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;
}
#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