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/*
* Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved.
* Copyright (C) 2008-2009 Torch Mobile, Inc.
*
* 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.
*/
#ifndef GraphicsContext_h
#define GraphicsContext_h
#include "DashArray.h"
#include "FloatRect.h"
#include "Image.h"
#include "IntRect.h"
#include "Path.h"
#include "TextDirection.h"
#include <wtf/Noncopyable.h>
#include <wtf/Platform.h>
#if PLATFORM(CG)
typedef struct CGContext PlatformGraphicsContext;
#elif PLATFORM(CAIRO)
typedef struct _cairo PlatformGraphicsContext;
#elif PLATFORM(QT)
QT_BEGIN_NAMESPACE
class QPainter;
QT_END_NAMESPACE
typedef QPainter PlatformGraphicsContext;
#elif PLATFORM(SGL)
namespace WebCore {
class PlatformGraphicsContext;
}
class SkPaint;
struct SkPoint;
#elif PLATFORM(WX)
class wxGCDC;
class wxWindowDC;
// wxGraphicsContext allows us to support Path, etc.
// but on some platforms, e.g. Linux, it requires fairly
// new software.
#if USE(WXGC)
// On OS X, wxGCDC is just a typedef for wxDC, so use wxDC explicitly to make
// the linker happy.
#ifdef __APPLE__
class wxDC;
typedef wxDC PlatformGraphicsContext;
#else
typedef wxGCDC PlatformGraphicsContext;
#endif
#else
typedef wxWindowDC PlatformGraphicsContext;
#endif
#elif PLATFORM(SKIA)
typedef class PlatformContextSkia PlatformGraphicsContext;
#elif PLATFORM(WINCE)
typedef struct HDC__ PlatformGraphicsContext;
#else
typedef void PlatformGraphicsContext;
#endif
#if PLATFORM(GTK)
typedef struct _GdkDrawable GdkDrawable;
typedef struct _GdkEventExpose GdkEventExpose;
#endif
#if PLATFORM(WIN)
typedef struct HDC__* HDC;
#if !PLATFORM(CG)
// UInt8 is defined in CoreFoundation/CFBase.h
typedef unsigned char UInt8;
#endif
#endif
#if PLATFORM(QT) && defined(Q_WS_WIN)
#include <windows.h>
#endif
namespace WebCore {
#if PLATFORM(WINCE) && !PLATFORM(QT)
class SharedBitmap;
class SimpleFontData;
class GlyphBuffer;
#endif
const int cMisspellingLineThickness = 3;
const int cMisspellingLinePatternWidth = 4;
const int cMisspellingLinePatternGapWidth = 1;
class TransformationMatrix;
class Font;
class Generator;
class Gradient;
class GraphicsContextPrivate;
class GraphicsContextPlatformPrivate;
class ImageBuffer;
class KURL;
class Path;
class Pattern;
class TextRun;
// These bits can be ORed together for a total of 8 possible text drawing modes.
const int cTextInvisible = 0;
const int cTextFill = 1;
const int cTextStroke = 2;
const int cTextClip = 4;
enum StrokeStyle {
NoStroke,
SolidStroke,
DottedStroke,
DashedStroke
};
// FIXME: This is a place-holder until we decide to add
// real color space support to WebCore. At that time, ColorSpace will be a
// class and instances will be held off of Colors. There will be
// special singleton Gradient and Pattern color spaces to mark when
// a fill or stroke is using a gradient or pattern instead of a solid color.
// https://bugs.webkit.org/show_bug.cgi?id=20558
enum ColorSpace {
SolidColorSpace,
PatternColorSpace,
GradientColorSpace
};
enum InterpolationQuality {
InterpolationDefault,
InterpolationNone,
InterpolationLow,
InterpolationMedium,
InterpolationHigh
};
class GraphicsContext : public Noncopyable {
public:
GraphicsContext(PlatformGraphicsContext*);
~GraphicsContext();
#if !PLATFORM(WINCE) || PLATFORM(QT)
PlatformGraphicsContext* platformContext() const;
#endif
float strokeThickness() const;
void setStrokeThickness(float);
StrokeStyle strokeStyle() const;
void setStrokeStyle(const StrokeStyle& style);
Color strokeColor() const;
void setStrokeColor(const Color&);
ColorSpace strokeColorSpace() const;
void setStrokePattern(PassRefPtr<Pattern>);
Pattern* strokePattern() const;
void setStrokeGradient(PassRefPtr<Gradient>);
Gradient* strokeGradient() const;
WindRule fillRule() const;
void setFillRule(WindRule);
Color fillColor() const;
void setFillColor(const Color&);
void setFillPattern(PassRefPtr<Pattern>);
Pattern* fillPattern() const;
void setFillGradient(PassRefPtr<Gradient>);
Gradient* fillGradient() const;
ColorSpace fillColorSpace() const;
void setShadowsIgnoreTransforms(bool);
void setShouldAntialias(bool);
bool shouldAntialias() const;
#if PLATFORM(CG)
void applyStrokePattern();
void applyFillPattern();
#endif
#if PLATFORM(SGL)
/* these should be pused to apple. needed for CanvasStyle.cpp */
void setCMYKAFillColor(float c, float m, float y, float k, float a);
void setCMYKAStrokeColor(float c, float m, float y, float k, float a);
// initialize a paint for filling
void setupFillPaint(SkPaint*);
// initialize a paint for stroking
void setupStrokePaint(SkPaint*);
// initialize a paint for a shadow, or if false is returned, the
// parameters are left untouched
bool setupShadowPaint(SkPaint* paint, SkPoint* offset);
// returns true if there is a valid (non-transparent) fill color
bool willFill() const;
// returns true if there is a valid (non-transparent) stroke color
bool willStroke() const;
// may return NULL, since we lazily allocate the path. This is the path
// that is drawn by drawPath()
const SkPath* getCurrPath() const;
/** platform-specific factory method to return a bitmap graphicscontext,
called by <canvas> when we need to draw offscreen. Caller is responsible for
deleting the context. Use drawOffscreenContext() to draw the context's image
onto another graphics context.
*/
static GraphicsContext* createOffscreenContext(int width, int height);
#endif
void save();
void restore();
// These draw methods will do both stroking and filling.
// FIXME: ...except drawRect(), which fills properly but always strokes
// using a 1-pixel stroke inset from the rect borders (of the correct
// stroke color).
void drawRect(const IntRect&);
void drawLine(const IntPoint&, const IntPoint&);
void drawEllipse(const IntRect&);
void drawConvexPolygon(size_t numPoints, const FloatPoint*, bool shouldAntialias = false);
void drawPath();
void fillPath();
void strokePath();
// Arc drawing (used by border-radius in CSS) just supports stroking at the moment.
void strokeArc(const IntRect&, int startAngle, int angleSpan);
void fillRect(const FloatRect&);
void fillRect(const FloatRect&, const Color&);
void fillRect(const FloatRect&, Generator&);
void fillRoundedRect(const IntRect&, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight, const Color&);
void clearRect(const FloatRect&);
void strokeRect(const FloatRect&);
void strokeRect(const FloatRect&, float lineWidth);
void drawImage(Image*, const IntPoint&, CompositeOperator = CompositeSourceOver);
void drawImage(Image*, const IntRect&, CompositeOperator = CompositeSourceOver, bool useLowQualityScale = false);
void drawImage(Image*, const IntPoint& destPoint, const IntRect& srcRect, CompositeOperator = CompositeSourceOver);
void drawImage(Image*, const IntRect& destRect, const IntRect& srcRect, CompositeOperator = CompositeSourceOver, bool useLowQualityScale = false);
void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect = FloatRect(0, 0, -1, -1),
CompositeOperator = CompositeSourceOver, bool useLowQualityScale = false);
void drawTiledImage(Image*, const IntRect& destRect, const IntPoint& srcPoint, const IntSize& tileSize,
CompositeOperator = CompositeSourceOver);
void drawTiledImage(Image*, const IntRect& destRect, const IntRect& srcRect,
Image::TileRule hRule = Image::StretchTile, Image::TileRule vRule = Image::StretchTile,
CompositeOperator = CompositeSourceOver);
void setImageInterpolationQuality(InterpolationQuality);
InterpolationQuality imageInterpolationQuality() const;
void clip(const FloatRect&);
void addRoundedRectClip(const IntRect&, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight);
void addInnerRoundedRectClip(const IntRect&, int thickness);
void clipOut(const IntRect&);
void clipOutEllipseInRect(const IntRect&);
void clipOutRoundedRect(const IntRect&, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight);
void clipPath(WindRule);
void clipToImageBuffer(const FloatRect&, const ImageBuffer*);
int textDrawingMode();
void setTextDrawingMode(int);
void drawText(const Font&, const TextRun&, const IntPoint&, int from = 0, int to = -1);
void drawBidiText(const Font&, const TextRun&, const FloatPoint&);
void drawHighlightForText(const Font&, const TextRun&, const IntPoint&, int h, const Color& backgroundColor, int from = 0, int to = -1);
FloatRect roundToDevicePixels(const FloatRect&);
void drawLineForText(const IntPoint&, int width, bool printing);
void drawLineForMisspellingOrBadGrammar(const IntPoint&, int width, bool grammar);
bool paintingDisabled() const;
void setPaintingDisabled(bool);
bool updatingControlTints() const;
void setUpdatingControlTints(bool);
void beginTransparencyLayer(float opacity);
void endTransparencyLayer();
void setShadow(const IntSize&, int blur, const Color&);
bool getShadow(IntSize&, int&, Color&) const;
void clearShadow();
void initFocusRing(int width, int offset);
void addFocusRingRect(const IntRect&);
void drawFocusRing(const Color&);
void clearFocusRing();
IntRect focusRingBoundingRect();
void setLineCap(LineCap);
void setLineDash(const DashArray&, float dashOffset);
void setLineJoin(LineJoin);
void setMiterLimit(float);
void setAlpha(float);
#if PLATFORM(CAIRO)
float getAlpha();
#endif
void setCompositeOperation(CompositeOperator);
void beginPath();
void addPath(const Path&);
void clip(const Path&);
void clipOut(const Path&);
void scale(const FloatSize&);
void rotate(float angleInRadians);
void translate(float x, float y);
IntPoint origin();
void setURLForRect(const KURL&, const IntRect&);
void concatCTM(const TransformationMatrix&);
TransformationMatrix getCTM() const;
#if PLATFORM(WINCE) && !PLATFORM(QT)
void setBitmap(PassRefPtr<SharedBitmap>);
const TransformationMatrix& affineTransform() const;
TransformationMatrix& affineTransform();
void resetAffineTransform();
void fillRect(const FloatRect&, const Gradient*);
void drawText(const SimpleFontData* fontData, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point);
void drawFrameControl(const IntRect& rect, unsigned type, unsigned state);
void drawFocusRect(const IntRect& rect);
void paintTextField(const IntRect& rect, unsigned state);
void drawBitmap(SharedBitmap*, const IntRect& dstRect, const IntRect& srcRect, CompositeOperator compositeOp);
void drawBitmapPattern(SharedBitmap*, const FloatRect& tileRectIn, const TransformationMatrix& patternTransform, const FloatPoint& phase, CompositeOperator op, const FloatRect& destRect, const IntSize& origSourceSize);
void drawIcon(HICON icon, const IntRect& dstRect, UINT flags);
HDC getWindowsContext(const IntRect&, bool supportAlphaBlend = false, bool mayCreateBitmap = true); // The passed in rect is used to create a bitmap for compositing inside transparency layers.
void releaseWindowsContext(HDC, const IntRect&, bool supportAlphaBlend = false, bool mayCreateBitmap = true); // The passed in HDC should be the one handed back by getWindowsContext.
void drawRoundCorner(bool newClip, RECT clipRect, RECT rectWin, HDC dc, int width, int height);
#elif PLATFORM(WIN)
GraphicsContext(HDC, bool hasAlpha = false); // FIXME: To be removed.
bool inTransparencyLayer() const;
HDC getWindowsContext(const IntRect&, bool supportAlphaBlend = true, bool mayCreateBitmap = true); // The passed in rect is used to create a bitmap for compositing inside transparency layers.
void releaseWindowsContext(HDC, const IntRect&, bool supportAlphaBlend = true, bool mayCreateBitmap = true); // The passed in HDC should be the one handed back by getWindowsContext.
// When set to true, child windows should be rendered into this context
// rather than allowing them just to render to the screen. Defaults to
// false.
// FIXME: This is a layering violation. GraphicsContext shouldn't know
// what a "window" is. It would be much more appropriate for this flag
// to be passed as a parameter alongside the GraphicsContext, but doing
// that would require lots of changes in cross-platform code that we
// aren't sure we want to make.
void setShouldIncludeChildWindows(bool);
bool shouldIncludeChildWindows() const;
class WindowsBitmap : public Noncopyable {
public:
WindowsBitmap(HDC, IntSize);
~WindowsBitmap();
HDC hdc() const { return m_hdc; }
UInt8* buffer() const { return m_bitmapBuffer; }
unsigned bufferLength() const { return m_bitmapBufferLength; }
IntSize size() const { return m_size; }
unsigned bytesPerRow() const { return m_bytesPerRow; }
private:
HDC m_hdc;
HBITMAP m_bitmap;
UInt8* m_bitmapBuffer;
unsigned m_bitmapBufferLength;
IntSize m_size;
unsigned m_bytesPerRow;
};
WindowsBitmap* createWindowsBitmap(IntSize);
// The bitmap should be non-premultiplied.
void drawWindowsBitmap(WindowsBitmap*, const IntPoint&);
#endif
#if PLATFORM(QT) && defined(Q_WS_WIN)
HDC getWindowsContext(const IntRect&, bool supportAlphaBlend = true, bool mayCreateBitmap = true);
void releaseWindowsContext(HDC, const IntRect&, bool supportAlphaBlend = true, bool mayCreateBitmap = true);
bool shouldIncludeChildWindows() const { return false; }
#endif
#if PLATFORM(QT)
bool inTransparencyLayer() const;
PlatformPath* currentPath();
QPen pen();
#endif
#if PLATFORM(GTK)
void setGdkExposeEvent(GdkEventExpose*);
GdkDrawable* gdkDrawable() const;
GdkEventExpose* gdkExposeEvent() const;
#endif
private:
void savePlatformState();
void restorePlatformState();
void setPlatformTextDrawingMode(int);
void setPlatformFont(const Font& font);
void setPlatformStrokeColor(const Color&);
void setPlatformStrokeStyle(const StrokeStyle&);
void setPlatformStrokeThickness(float);
void setPlatformStrokeGradient(Gradient*);
void setPlatformStrokePattern(Pattern*);
void setPlatformFillColor(const Color&);
void setPlatformFillGradient(Gradient*);
void setPlatformFillPattern(Pattern*);
void setPlatformShouldAntialias(bool b);
void setPlatformShadow(const IntSize&, int blur, const Color&);
void clearPlatformShadow();
int focusRingWidth() const;
int focusRingOffset() const;
const Vector<IntRect>& focusRingRects() const;
static GraphicsContextPrivate* createGraphicsContextPrivate();
static void destroyGraphicsContextPrivate(GraphicsContextPrivate*);
GraphicsContextPrivate* m_common;
GraphicsContextPlatformPrivate* m_data; // Deprecated; m_commmon can just be downcasted. To be removed.
};
} // namespace WebCore
#endif // GraphicsContext_h
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