GraphicsContextCairo.cpp [plain text]
#include "config.h"
#include "GraphicsContext.h"
#if USE(CAIRO)
#include "AffineTransform.h"
#include "CairoUtilities.h"
#include "FloatConversion.h"
#include "FloatRect.h"
#include "Font.h"
#include "GraphicsContextPlatformPrivateCairo.h"
#include "OwnPtrCairo.h"
#include "IntRect.h"
#include "NotImplemented.h"
#include "Path.h"
#include "Pattern.h"
#include "PlatformContextCairo.h"
#include "PlatformPathCairo.h"
#include "RefPtrCairo.h"
#include "ShadowBlur.h"
#include "SimpleFontData.h"
#include <cairo.h>
#include <math.h>
#include <stdio.h>
#include <wtf/MathExtras.h>
#if PLATFORM(GTK)
#include <gdk/gdk.h>
#include <pango/pango.h>
#elif PLATFORM(WIN)
#include <cairo-win32.h>
#endif
using namespace std;
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
namespace WebCore {
static inline void fillRectWithColor(cairo_t* cr, const FloatRect& rect, const Color& color)
{
if (!color.alpha())
return;
setSourceRGBAFromColor(cr, color);
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
cairo_fill(cr);
}
static void addConvexPolygonToContext(cairo_t* context, size_t numPoints, const FloatPoint* points)
{
cairo_move_to(context, points[0].x(), points[0].y());
for (size_t i = 1; i < numPoints; i++)
cairo_line_to(context, points[i].x(), points[i].y());
cairo_close_path(context);
}
enum PathDrawingStyle {
Fill = 1,
Stroke = 2,
FillAndStroke = Fill + Stroke
};
static inline void drawPathShadow(GraphicsContext* context, PathDrawingStyle drawingStyle)
{
ShadowBlur& shadow = context->platformContext()->shadowBlur();
if (shadow.type() == ShadowBlur::NoShadow)
return;
cairo_t* cairoContext = context->platformContext()->cr();
OwnPtr<cairo_path_t> path = adoptPtr(cairo_copy_path(cairoContext));
FloatRect solidFigureExtents;
double x0 = 0;
double x1 = 0;
double y0 = 0;
double y1 = 0;
if (drawingStyle & Stroke) {
cairo_stroke_extents(cairoContext, &x0, &y0, &x1, &y1);
solidFigureExtents = FloatRect(x0, y0, x1 - x0, y1 - y0);
}
if (drawingStyle & Fill) {
cairo_fill_extents(cairoContext, &x0, &y0, &x1, &y1);
FloatRect fillExtents(x0, y0, x1 - x0, y1 - y0);
solidFigureExtents.unite(fillExtents);
}
GraphicsContext* shadowContext = shadow.beginShadowLayer(context, solidFigureExtents);
if (!shadowContext)
return;
cairo_t* cairoShadowContext = shadowContext->platformContext()->cr();
copyContextProperties(cairoContext, cairoShadowContext);
if (drawingStyle & Fill) {
cairo_save(cairoShadowContext);
cairo_append_path(cairoShadowContext, path.get());
shadowContext->platformContext()->prepareForFilling(context->state(), PlatformContextCairo::NoAdjustment);
cairo_fill(cairoShadowContext);
cairo_restore(cairoShadowContext);
}
if (drawingStyle & Stroke) {
cairo_append_path(cairoShadowContext, path.get());
shadowContext->platformContext()->prepareForStroking(context->state(), PlatformContextCairo::DoNotPreserveAlpha);
cairo_stroke(cairoShadowContext);
}
shadow.endShadowLayer(context);
cairo_new_path(cairoContext);
cairo_append_path(cairoContext, path.get());
}
static inline void shadowAndFillCurrentCairoPath(GraphicsContext* context)
{
cairo_t* cr = context->platformContext()->cr();
cairo_save(cr);
drawPathShadow(context, Fill);
context->platformContext()->prepareForFilling(context->state(), PlatformContextCairo::AdjustPatternForGlobalAlpha);
cairo_fill(cr);
cairo_restore(cr);
}
static inline void shadowAndStrokeCurrentCairoPath(GraphicsContext* context)
{
drawPathShadow(context, Stroke);
context->platformContext()->prepareForStroking(context->state());
cairo_stroke(context->platformContext()->cr());
}
GraphicsContext::GraphicsContext(cairo_t* cr)
: m_updatingControlTints(false),
m_transparencyCount(0)
{
m_data = new GraphicsContextPlatformPrivateToplevel(new PlatformContextCairo(cr));
}
void GraphicsContext::platformInit(PlatformContextCairo* platformContext)
{
m_data = new GraphicsContextPlatformPrivate(platformContext);
if (platformContext)
m_data->syncContext(platformContext->cr());
else
setPaintingDisabled(true);
}
void GraphicsContext::platformDestroy()
{
delete m_data;
}
AffineTransform GraphicsContext::getCTM(IncludeDeviceScale) const
{
if (paintingDisabled())
return AffineTransform();
cairo_t* cr = platformContext()->cr();
cairo_matrix_t m;
cairo_get_matrix(cr, &m);
return AffineTransform(m.xx, m.yx, m.xy, m.yy, m.x0, m.y0);
}
PlatformContextCairo* GraphicsContext::platformContext() const
{
return m_data->platformContext;
}
void GraphicsContext::savePlatformState()
{
platformContext()->save();
m_data->save();
}
void GraphicsContext::restorePlatformState()
{
platformContext()->restore();
m_data->restore();
platformContext()->shadowBlur().setShadowValues(FloatSize(m_state.shadowBlur, m_state.shadowBlur),
m_state.shadowOffset,
m_state.shadowColor,
m_state.shadowColorSpace,
m_state.shadowsIgnoreTransforms);
}
void GraphicsContext::drawRect(const IntRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
fillRectWithColor(cr, rect, fillColor());
if (strokeStyle() != NoStroke) {
setSourceRGBAFromColor(cr, strokeColor());
FloatRect r(rect);
r.inflate(-.5f);
cairo_rectangle(cr, r.x(), r.y(), r.width(), r.height());
cairo_set_line_width(cr, 1.0);
cairo_stroke(cr);
}
cairo_restore(cr);
}
static double calculateStrokePatternOffset(int distance, int patternWidth)
{
int remainder = distance % patternWidth;
int numSegments = (distance - remainder) / patternWidth;
if (patternWidth == 1)
return 1;
bool evenNumberOfSegments = !(numSegments % 2);
if (remainder)
evenNumberOfSegments = !evenNumberOfSegments;
if (evenNumberOfSegments) {
if (remainder)
return (patternWidth - remainder) + (remainder / 2);
return patternWidth / 2;
}
if (remainder)
return (patternWidth - remainder) / 2.f;
return 0;
}
static void drawLineOnCairoContext(GraphicsContext* graphicsContext, cairo_t* context, const FloatPoint& point1, const FloatPoint& point2)
{
StrokeStyle style = graphicsContext->strokeStyle();
if (style == NoStroke)
return;
const Color& strokeColor = graphicsContext->strokeColor();
int strokeThickness = floorf(graphicsContext->strokeThickness());
if (graphicsContext->strokeThickness() < 1)
strokeThickness = 1;
int patternWidth = 0;
if (style == DottedStroke)
patternWidth = strokeThickness;
else if (style == DashedStroke)
patternWidth = 3 * strokeThickness;
bool isVerticalLine = point1.x() == point2.x();
FloatPoint point1OnPixelBoundaries = point1;
FloatPoint point2OnPixelBoundaries = point2;
GraphicsContext::adjustLineToPixelBoundaries(point1OnPixelBoundaries, point2OnPixelBoundaries, strokeThickness, style);
cairo_set_antialias(context, CAIRO_ANTIALIAS_NONE);
if (patternWidth) {
FloatRect firstRect(point1OnPixelBoundaries, FloatSize(strokeThickness, strokeThickness));
FloatRect secondRect(point2OnPixelBoundaries, FloatSize(strokeThickness, strokeThickness));
if (isVerticalLine) {
firstRect.move(-strokeThickness / 2, -strokeThickness);
secondRect.move(-strokeThickness / 2, 0);
} else {
firstRect.move(-strokeThickness, -strokeThickness / 2);
secondRect.move(0, -strokeThickness / 2);
}
fillRectWithColor(context, firstRect, strokeColor);
fillRectWithColor(context, secondRect, strokeColor);
int distance = (isVerticalLine ? (point2.y() - point1.y()) : (point2.x() - point1.x())) - 2 * strokeThickness;
double patternOffset = calculateStrokePatternOffset(distance, patternWidth);
double patternWidthAsDouble = patternWidth;
cairo_set_dash(context, &patternWidthAsDouble, 1, patternOffset);
}
setSourceRGBAFromColor(context, strokeColor);
cairo_set_line_width(context, strokeThickness);
cairo_move_to(context, point1OnPixelBoundaries.x(), point1OnPixelBoundaries.y());
cairo_line_to(context, point2OnPixelBoundaries.x(), point2OnPixelBoundaries.y());
cairo_stroke(context);
}
void GraphicsContext::drawLine(const IntPoint& point1, const IntPoint& point2)
{
if (paintingDisabled())
return;
cairo_t* cairoContext = platformContext()->cr();
cairo_save(cairoContext);
drawLineOnCairoContext(this, cairoContext, point1, point2);
cairo_restore(cairoContext);
}
void GraphicsContext::drawEllipse(const IntRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
float yRadius = .5 * rect.height();
float xRadius = .5 * rect.width();
cairo_translate(cr, rect.x() + xRadius, rect.y() + yRadius);
cairo_scale(cr, xRadius, yRadius);
cairo_arc(cr, 0., 0., 1., 0., 2 * M_PI);
cairo_restore(cr);
if (fillColor().alpha()) {
setSourceRGBAFromColor(cr, fillColor());
cairo_fill_preserve(cr);
}
if (strokeStyle() != NoStroke) {
setSourceRGBAFromColor(cr, strokeColor());
cairo_set_line_width(cr, strokeThickness());
cairo_stroke(cr);
} else
cairo_new_path(cr);
}
void GraphicsContext::strokeArc(const IntRect& rect, int startAngle, int angleSpan)
{
if (paintingDisabled() || strokeStyle() == NoStroke)
return;
int x = rect.x();
int y = rect.y();
float w = rect.width();
float h = rect.height();
float scaleFactor = h / w;
float reverseScaleFactor = w / h;
float hRadius = w / 2;
float vRadius = h / 2;
float fa = startAngle;
float falen = fa + angleSpan;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
if (w != h)
cairo_scale(cr, 1., scaleFactor);
cairo_arc_negative(cr, x + hRadius, (y + vRadius) * reverseScaleFactor, hRadius, -fa * M_PI/180, -falen * M_PI/180);
if (w != h)
cairo_scale(cr, 1., reverseScaleFactor);
int patternWidth = 0;
switch (strokeStyle()) {
case DottedStroke:
patternWidth = floorf(strokeThickness() / 2.f);
break;
case DashedStroke:
patternWidth = 3 * floorf(strokeThickness() / 2.f);
break;
default:
break;
}
setSourceRGBAFromColor(cr, strokeColor());
if (patternWidth) {
float distance = 0;
if (hRadius == vRadius)
distance = (piFloat * hRadius) / 2.f;
else distance = (piFloat * sqrtf((hRadius * hRadius + vRadius * vRadius) / 2.f)) / 2.f;
double patternOffset = calculateStrokePatternOffset(floorf(distance), patternWidth);
double patternWidthAsDouble = patternWidth;
cairo_set_dash(cr, &patternWidthAsDouble, 1, patternOffset);
}
cairo_stroke(cr);
cairo_restore(cr);
}
void GraphicsContext::drawConvexPolygon(size_t npoints, const FloatPoint* points, bool shouldAntialias)
{
if (paintingDisabled())
return;
if (npoints <= 1)
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
cairo_set_antialias(cr, shouldAntialias ? CAIRO_ANTIALIAS_DEFAULT : CAIRO_ANTIALIAS_NONE);
addConvexPolygonToContext(cr, npoints, points);
if (fillColor().alpha()) {
setSourceRGBAFromColor(cr, fillColor());
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_fill_preserve(cr);
}
if (strokeStyle() != NoStroke) {
setSourceRGBAFromColor(cr, strokeColor());
cairo_set_line_width(cr, strokeThickness());
cairo_stroke(cr);
} else
cairo_new_path(cr);
cairo_restore(cr);
}
void GraphicsContext::clipConvexPolygon(size_t numPoints, const FloatPoint* points, bool antialiased)
{
if (paintingDisabled())
return;
if (numPoints <= 1)
return;
cairo_t* cr = platformContext()->cr();
cairo_new_path(cr);
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_antialias_t savedAntialiasRule = cairo_get_antialias(cr);
cairo_set_antialias(cr, antialiased ? CAIRO_ANTIALIAS_DEFAULT : CAIRO_ANTIALIAS_NONE);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING);
addConvexPolygonToContext(cr, numPoints, points);
cairo_clip(cr);
cairo_set_antialias(cr, savedAntialiasRule);
cairo_set_fill_rule(cr, savedFillRule);
}
void GraphicsContext::fillPath(const Path& path)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
setPathOnCairoContext(cr, path.platformPath()->context());
shadowAndFillCurrentCairoPath(this);
}
void GraphicsContext::strokePath(const Path& path)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
setPathOnCairoContext(cr, path.platformPath()->context());
shadowAndStrokeCurrentCairoPath(this);
}
void GraphicsContext::fillRect(const FloatRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
shadowAndFillCurrentCairoPath(this);
}
void GraphicsContext::fillRect(const FloatRect& rect, const Color& color, ColorSpace)
{
if (paintingDisabled())
return;
if (hasShadow())
platformContext()->shadowBlur().drawRectShadow(this, rect, RoundedRect::Radii());
fillRectWithColor(platformContext()->cr(), rect, color);
}
void GraphicsContext::clip(const FloatRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING);
cairo_clip(cr);
cairo_set_fill_rule(cr, savedFillRule);
m_data->clip(rect);
}
void GraphicsContext::clipPath(const Path& path, WindRule clipRule)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
setPathOnCairoContext(cr, path.platformPath()->context());
cairo_set_fill_rule(cr, clipRule == RULE_EVENODD ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
cairo_clip(cr);
}
IntRect GraphicsContext::clipBounds() const
{
double x1, x2, y1, y2;
cairo_clip_extents(platformContext()->cr(), &x1, &y1, &x2, &y2);
return enclosingIntRect(FloatRect(x1, y1, x2 - x1, y2 - y1));
}
static inline void adjustFocusRingColor(Color& color)
{
#if !PLATFORM(GTK)
color.setRGB(makeRGBA(color.red(), color.green(), color.blue(), 127));
#endif
}
static inline void adjustFocusRingLineWidth(int& width)
{
#if PLATFORM(GTK)
width = 2;
#endif
}
static inline StrokeStyle focusRingStrokeStyle()
{
#if PLATFORM(GTK)
return DottedStroke;
#else
return SolidStroke;
#endif
}
void GraphicsContext::drawFocusRing(const Path& path, int width, int , const Color& color)
{
Color ringColor = color;
adjustFocusRingColor(ringColor);
adjustFocusRingLineWidth(width);
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
appendWebCorePathToCairoContext(cr, path);
setSourceRGBAFromColor(cr, ringColor);
cairo_set_line_width(cr, width);
setPlatformStrokeStyle(focusRingStrokeStyle());
cairo_stroke(cr);
cairo_restore(cr);
}
void GraphicsContext::drawFocusRing(const Vector<IntRect>& rects, int width, int , const Color& color)
{
if (paintingDisabled())
return;
unsigned rectCount = rects.size();
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
cairo_push_group(cr);
cairo_new_path(cr);
#if PLATFORM(GTK)
#ifdef GTK_API_VERSION_2
GdkRegion* reg = gdk_region_new();
#else
cairo_region_t* reg = cairo_region_create();
#endif
for (unsigned i = 0; i < rectCount; i++) {
#ifdef GTK_API_VERSION_2
GdkRectangle rect = rects[i];
gdk_region_union_with_rect(reg, &rect);
#else
cairo_rectangle_int_t rect = rects[i];
cairo_region_union_rectangle(reg, &rect);
#endif
}
gdk_cairo_region(cr, reg);
#ifdef GTK_API_VERSION_2
gdk_region_destroy(reg);
#else
cairo_region_destroy(reg);
#endif
#else
int radius = (width - 1) / 2;
Path path;
for (unsigned i = 0; i < rectCount; ++i) {
if (i > 0)
path.clear();
path.addRoundedRect(rects[i], FloatSize(radius, radius));
appendWebCorePathToCairoContext(cr, path);
}
#endif
Color ringColor = color;
adjustFocusRingColor(ringColor);
adjustFocusRingLineWidth(width);
setSourceRGBAFromColor(cr, ringColor);
cairo_set_line_width(cr, width);
setPlatformStrokeStyle(focusRingStrokeStyle());
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_stroke_preserve(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING);
cairo_fill(cr);
cairo_pop_group_to_source(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_paint(cr);
cairo_restore(cr);
}
void GraphicsContext::drawLineForText(const FloatPoint& origin, float width, bool printing)
{
if (paintingDisabled())
return;
cairo_t* cairoContext = platformContext()->cr();
cairo_save(cairoContext);
FloatPoint endPoint(origin + IntSize(width, 0));
FloatRect lineExtents(origin, FloatSize(width, strokeThickness()));
ShadowBlur& shadow = platformContext()->shadowBlur();
if (GraphicsContext* shadowContext = shadow.beginShadowLayer(this, lineExtents)) {
drawLineOnCairoContext(this, shadowContext->platformContext()->cr(), origin, endPoint);
shadow.endShadowLayer(this);
}
drawLineOnCairoContext(this, cairoContext, origin, endPoint);
cairo_restore(cairoContext);
}
#if !PLATFORM(GTK)
#include "DrawErrorUnderline.h"
#endif
void GraphicsContext::drawLineForDocumentMarker(const FloatPoint& origin, float width, DocumentMarkerLineStyle style)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
switch (style) {
case DocumentMarkerSpellingLineStyle:
cairo_set_source_rgb(cr, 1, 0, 0);
break;
case DocumentMarkerGrammarLineStyle:
cairo_set_source_rgb(cr, 0, 1, 0);
break;
default:
cairo_restore(cr);
return;
}
#if PLATFORM(GTK)
pango_cairo_show_error_underline(cr, origin.x(), origin.y(), width, cMisspellingLineThickness);
#else
drawErrorUnderline(cr, origin.x(), origin.y(), width, cMisspellingLineThickness);
#endif
cairo_restore(cr);
}
FloatRect GraphicsContext::roundToDevicePixels(const FloatRect& frect, RoundingMode)
{
FloatRect result;
double x = frect.x();
double y = frect.y();
cairo_t* cr = platformContext()->cr();
cairo_user_to_device(cr, &x, &y);
x = round(x);
y = round(y);
cairo_device_to_user(cr, &x, &y);
result.setX(narrowPrecisionToFloat(x));
result.setY(narrowPrecisionToFloat(y));
double width = frect.width();
double height = frect.height();
cairo_user_to_device_distance(cr, &width, &height);
if (width > -1 && width < 0)
width = -1;
else if (width > 0 && width < 1)
width = 1;
else
width = round(width);
if (height > -1 && width < 0)
height = -1;
else if (height > 0 && height < 1)
height = 1;
else
height = round(height);
cairo_device_to_user_distance(cr, &width, &height);
result.setWidth(narrowPrecisionToFloat(width));
result.setHeight(narrowPrecisionToFloat(height));
return result;
}
void GraphicsContext::translate(float x, float y)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_translate(cr, x, y);
m_data->translate(x, y);
}
void GraphicsContext::setPlatformFillColor(const Color& col, ColorSpace colorSpace)
{
}
void GraphicsContext::setPlatformStrokeColor(const Color& col, ColorSpace colorSpace)
{
}
void GraphicsContext::setPlatformStrokeThickness(float strokeThickness)
{
if (paintingDisabled())
return;
cairo_set_line_width(platformContext()->cr(), strokeThickness);
}
void GraphicsContext::setPlatformStrokeStyle(StrokeStyle strokeStyle)
{
static double dashPattern[] = {5.0, 5.0};
static double dotPattern[] = {1.0, 1.0};
if (paintingDisabled())
return;
switch (strokeStyle) {
case NoStroke:
cairo_set_line_width(platformContext()->cr(), 0);
break;
case SolidStroke:
cairo_set_dash(platformContext()->cr(), 0, 0, 0);
break;
case DottedStroke:
cairo_set_dash(platformContext()->cr(), dotPattern, 2, 0);
break;
case DashedStroke:
cairo_set_dash(platformContext()->cr(), dashPattern, 2, 0);
break;
}
}
void GraphicsContext::setURLForRect(const KURL& link, const IntRect& destRect)
{
notImplemented();
}
void GraphicsContext::concatCTM(const AffineTransform& transform)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
const cairo_matrix_t matrix = cairo_matrix_t(transform);
cairo_transform(cr, &matrix);
m_data->concatCTM(transform);
}
void GraphicsContext::setCTM(const AffineTransform& transform)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
const cairo_matrix_t matrix = cairo_matrix_t(transform);
cairo_set_matrix(cr, &matrix);
m_data->setCTM(transform);
}
void GraphicsContext::addInnerRoundedRectClip(const IntRect& rect, int thickness)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
clip(rect);
Path p;
FloatRect r(rect);
p.addEllipse(r);
r.inflate(-thickness);
p.addEllipse(r);
appendWebCorePathToCairoContext(cr, p);
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_clip(cr);
cairo_set_fill_rule(cr, savedFillRule);
}
void GraphicsContext::setPlatformShadow(FloatSize const& size, float blur, Color const& color, ColorSpace)
{
if (paintingDisabled())
return;
if (m_state.shadowsIgnoreTransforms) {
m_state.shadowOffset = FloatSize(size.width(), -size.height());
}
platformContext()->shadowBlur().setShadowValues(FloatSize(m_state.shadowBlur, m_state.shadowBlur),
m_state.shadowOffset,
m_state.shadowColor,
m_state.shadowColorSpace,
m_state.shadowsIgnoreTransforms);
}
void GraphicsContext::clearPlatformShadow()
{
if (paintingDisabled())
return;
platformContext()->shadowBlur().clear();
}
void GraphicsContext::beginPlatformTransparencyLayer(float opacity)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_push_group(cr);
m_data->layers.append(opacity);
}
void GraphicsContext::endPlatformTransparencyLayer()
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_pop_group_to_source(cr);
cairo_paint_with_alpha(cr, m_data->layers.last());
m_data->layers.removeLast();
}
bool GraphicsContext::supportsTransparencyLayers()
{
return true;
}
void GraphicsContext::clearRect(const FloatRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_fill(cr);
cairo_restore(cr);
}
void GraphicsContext::strokeRect(const FloatRect& rect, float width)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
cairo_set_line_width(cr, width);
shadowAndStrokeCurrentCairoPath(this);
cairo_restore(cr);
}
void GraphicsContext::setLineCap(LineCap lineCap)
{
if (paintingDisabled())
return;
cairo_line_cap_t cairoCap = CAIRO_LINE_CAP_BUTT;
switch (lineCap) {
case ButtCap:
break;
case RoundCap:
cairoCap = CAIRO_LINE_CAP_ROUND;
break;
case SquareCap:
cairoCap = CAIRO_LINE_CAP_SQUARE;
break;
}
cairo_set_line_cap(platformContext()->cr(), cairoCap);
}
void GraphicsContext::setLineDash(const DashArray& dashes, float dashOffset)
{
cairo_set_dash(platformContext()->cr(), dashes.data(), dashes.size(), dashOffset);
}
void GraphicsContext::setLineJoin(LineJoin lineJoin)
{
if (paintingDisabled())
return;
cairo_line_join_t cairoJoin = CAIRO_LINE_JOIN_MITER;
switch (lineJoin) {
case MiterJoin:
break;
case RoundJoin:
cairoJoin = CAIRO_LINE_JOIN_ROUND;
break;
case BevelJoin:
cairoJoin = CAIRO_LINE_JOIN_BEVEL;
break;
}
cairo_set_line_join(platformContext()->cr(), cairoJoin);
}
void GraphicsContext::setMiterLimit(float miter)
{
if (paintingDisabled())
return;
cairo_set_miter_limit(platformContext()->cr(), miter);
}
void GraphicsContext::setAlpha(float alpha)
{
platformContext()->setGlobalAlpha(alpha);
}
void GraphicsContext::setPlatformCompositeOperation(CompositeOperator op)
{
if (paintingDisabled())
return;
cairo_set_operator(platformContext()->cr(), toCairoOperator(op));
}
void GraphicsContext::clip(const Path& path)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
OwnPtr<cairo_path_t> pathCopy = adoptPtr(cairo_copy_path(path.platformPath()->context()));
cairo_append_path(cr, pathCopy.get());
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING);
cairo_clip(cr);
cairo_set_fill_rule(cr, savedFillRule);
m_data->clip(path);
}
void GraphicsContext::canvasClip(const Path& path)
{
clip(path);
}
void GraphicsContext::clipOut(const Path& path)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
double x1, y1, x2, y2;
cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
cairo_rectangle(cr, x1, y1, x2 - x1, y2 - y1);
appendWebCorePathToCairoContext(cr, path);
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_clip(cr);
cairo_set_fill_rule(cr, savedFillRule);
}
void GraphicsContext::rotate(float radians)
{
if (paintingDisabled())
return;
cairo_rotate(platformContext()->cr(), radians);
m_data->rotate(radians);
}
void GraphicsContext::scale(const FloatSize& size)
{
if (paintingDisabled())
return;
cairo_scale(platformContext()->cr(), size.width(), size.height());
m_data->scale(size);
}
void GraphicsContext::clipOut(const IntRect& r)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
double x1, y1, x2, y2;
cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
cairo_rectangle(cr, x1, y1, x2 - x1, y2 - y1);
cairo_rectangle(cr, r.x(), r.y(), r.width(), r.height());
cairo_fill_rule_t savedFillRule = cairo_get_fill_rule(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_clip(cr);
cairo_set_fill_rule(cr, savedFillRule);
}
static inline FloatPoint getPhase(const FloatRect& dest, const FloatRect& tile)
{
FloatPoint phase = dest.location();
phase.move(-tile.x(), -tile.y());
return phase;
}
void GraphicsContext::fillRoundedRect(const IntRect& r, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight, const Color& color, ColorSpace colorSpace)
{
if (paintingDisabled())
return;
if (hasShadow())
platformContext()->shadowBlur().drawRectShadow(this, r, RoundedRect::Radii(topLeft, topRight, bottomLeft, bottomRight));
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
Path path;
path.addRoundedRect(r, topLeft, topRight, bottomLeft, bottomRight);
appendWebCorePathToCairoContext(cr, path);
setSourceRGBAFromColor(cr, color);
cairo_fill(cr);
cairo_restore(cr);
}
#if PLATFORM(GTK)
void GraphicsContext::setGdkExposeEvent(GdkEventExpose* expose)
{
m_data->expose = expose;
}
GdkEventExpose* GraphicsContext::gdkExposeEvent() const
{
return m_data->expose;
}
GdkWindow* GraphicsContext::gdkWindow() const
{
if (!m_data->expose)
return 0;
return m_data->expose->window;
}
#endif
void GraphicsContext::setPlatformShouldAntialias(bool enable)
{
if (paintingDisabled())
return;
cairo_set_antialias(platformContext()->cr(), enable ? CAIRO_ANTIALIAS_DEFAULT : CAIRO_ANTIALIAS_NONE);
}
void GraphicsContext::setImageInterpolationQuality(InterpolationQuality quality)
{
platformContext()->setImageInterpolationQuality(quality);
}
InterpolationQuality GraphicsContext::imageInterpolationQuality() const
{
return platformContext()->imageInterpolationQuality();
}
#if ENABLE(3D_RENDERING) && USE(TEXTURE_MAPPER)
TransformationMatrix GraphicsContext::get3DTransform() const
{
notImplemented();
return TransformationMatrix();
}
void GraphicsContext::concat3DTransform(const TransformationMatrix& transform)
{
notImplemented();
}
void GraphicsContext::set3DTransform(const TransformationMatrix& transform)
{
notImplemented();
}
#endif
}
#endif // USE(CAIRO)