void PlatformContextCairo::drawSurfaceToContext(cairo_surface_t* surface, const FloatRect& destRect, const FloatRect& srcRect, GraphicsContext* context)
{
// If we're drawing a sub portion of the image or scaling then create
// a pattern transformation on the image and draw the transformed pattern.
// Test using example site at http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html
RefPtr<cairo_pattern_t> pattern = adoptRef(cairo_pattern_create_for_surface(surface));
ASSERT(m_state);
switch (m_state->m_imageInterpolationQuality) {
case InterpolationNone:
case InterpolationLow:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_FAST);
break;
case InterpolationMedium:
case InterpolationHigh:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BILINEAR);
break;
case InterpolationDefault:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BILINEAR);
break;
}
cairo_pattern_set_extend(pattern.get(), CAIRO_EXTEND_PAD);
float scaleX = srcRect.width() / destRect.width();
float scaleY = srcRect.height() / destRect.height();
cairo_matrix_t matrix = { scaleX, 0, 0, scaleY, srcRect.x(), srcRect.y() };
cairo_pattern_set_matrix(pattern.get(), &matrix);
ShadowBlur& shadow = context->platformContext()->shadowBlur();
if (shadow.type() != ShadowBlur::NoShadow) {
if (GraphicsContext* shadowContext = shadow.beginShadowLayer(context, destRect)) {
drawPatternToCairoContext(shadowContext->platformContext()->cr(), pattern.get(), destRect, 1);
shadow.endShadowLayer(context);
}
}
cairo_save(m_cr.get());
drawPatternToCairoContext(m_cr.get(), pattern.get(), destRect, globalAlpha());
cairo_restore(m_cr.get());
}
void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform,
const FloatPoint& phase, ColorSpace colorSpace, CompositeOperator op, const FloatRect& destRect)
{
cairo_surface_t* image = nativeImageForCurrentFrame();
if (!image) // If it's too early we won't have an image yet.
return;
cairo_t* cr = context->platformContext()->cr();
drawPatternToCairoContext(cr, image, size(), tileRect, patternTransform, phase, toCairoOperator(op), destRect);
if (imageObserver())
imageObserver()->didDraw(this);
}
void Image::drawPattern(GraphicsContext& context, const FloatRect& tileRect, const AffineTransform& patternTransform,
const FloatPoint& phase, ColorSpace, CompositeOperator op, const FloatRect& destRect, BlendMode blendOp)
{
RefPtr<cairo_surface_t> surface = nativeImageForCurrentFrame();
if (!surface) // If it's too early we won't have an image yet.
return;
cairo_t* cr = context.platformContext()->cr();
cairo_operator_t cairoOp;
if (blendOp == BlendModeNormal)
cairoOp = toCairoOperator(op);
else
cairoOp = toCairoOperator(blendOp);
drawPatternToCairoContext(cr, surface.get(), IntSize(size()), tileRect, patternTransform, phase, cairoOp, destRect);
if (imageObserver())
imageObserver()->didDraw(this);
}
void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform,
const FloatPoint& phase, ColorSpace colorSpace, CompositeOperator op, const FloatRect& destRect)
{
cairo_surface_t* image = nativeImageForCurrentFrame();
if (!image) // If it's too early we won't have an image yet.
return;
cairo_t* cr = context->platformContext()->cr();
drawPatternToCairoContext(cr, image, size(), tileRect, patternTransform, phase, toCairoOperator(op), destRect);
if (imageObserver())
imageObserver()->didDraw(this);
//+EAWebKitChange
//5/30/2012
#if ENABLE(IMAGE_COMPRESSION)
// Check if this is a compressed surface.
const void* pCompressedSurfaceUserData = cairo_surface_get_user_data (image, (cairo_user_data_key_t*) ImageCompressionGetUserDataKey());
if (pCompressedSurfaceUserData)
cairo_surface_destroy(image);
#endif
//-EAWebKitChange
}
void PlatformContextCairo::drawSurfaceToContext(cairo_surface_t* surface, const FloatRect& destRect, const FloatRect& originalSrcRect, GraphicsContext* context)
{
FloatRect srcRect = originalSrcRect;
// We need to account for negative source dimensions by flipping the rectangle.
if (originalSrcRect.width() < 0) {
srcRect.setX(originalSrcRect.x() + originalSrcRect.width());
srcRect.setWidth(std::fabs(originalSrcRect.width()));
}
if (originalSrcRect.height() < 0) {
srcRect.setY(originalSrcRect.y() + originalSrcRect.height());
srcRect.setHeight(std::fabs(originalSrcRect.height()));
}
// Cairo subsurfaces don't support floating point boundaries well, so we expand the rectangle.
IntRect expandedSrcRect(enclosingIntRect(srcRect));
// We use a subsurface here so that we don't end up sampling outside the originalSrcRect rectangle.
// See https://bugs.webkit.org/show_bug.cgi?id=58309
RefPtr<cairo_surface_t> subsurface = adoptRef(cairo_surface_create_for_rectangle(
surface, expandedSrcRect.x(), expandedSrcRect.y(), expandedSrcRect.width(), expandedSrcRect.height()));
RefPtr<cairo_pattern_t> pattern = adoptRef(cairo_pattern_create_for_surface(subsurface.get()));
ASSERT(m_state);
switch (m_state->m_imageInterpolationQuality) {
case InterpolationNone:
case InterpolationLow:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_FAST);
break;
case InterpolationMedium:
case InterpolationHigh:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BILINEAR);
break;
case InterpolationDefault:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BILINEAR);
break;
}
cairo_pattern_set_extend(pattern.get(), CAIRO_EXTEND_PAD);
// The pattern transformation properly scales the pattern for when the source rectangle is a
// different size than the destination rectangle. We also account for any offset we introduced
// by expanding floating point source rectangle sizes. It's important to take the absolute value
// of the scale since the original width and height might be negative.
float scaleX = std::fabs(srcRect.width() / destRect.width());
float scaleY = std::fabs(srcRect.height() / destRect.height());
float leftPadding = static_cast<float>(expandedSrcRect.x()) - floorf(srcRect.x());
float topPadding = static_cast<float>(expandedSrcRect.y()) - floorf(srcRect.y());
cairo_matrix_t matrix = { scaleX, 0, 0, scaleY, leftPadding, topPadding };
cairo_pattern_set_matrix(pattern.get(), &matrix);
ShadowBlur& shadow = context->platformContext()->shadowBlur();
if (shadow.type() != ShadowBlur::NoShadow) {
if (GraphicsContext* shadowContext = shadow.beginShadowLayer(context, destRect)) {
drawPatternToCairoContext(shadowContext->platformContext()->cr(), pattern.get(), destRect, 1);
shadow.endShadowLayer(context);
}
}
cairo_save(m_cr.get());
drawPatternToCairoContext(m_cr.get(), pattern.get(), destRect, globalAlpha());
cairo_restore(m_cr.get());
}
