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/*
* Copyright (C) 2004, 2005, 2006 Apple Inc. 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 "Image.h"
#if USE(CG)
#include "FloatConversion.h"
#include "FloatRect.h"
#include "GraphicsContextCG.h"
#include "ImageObserver.h"
#include <ApplicationServices/ApplicationServices.h>
#include <wtf/RetainPtr.h>
#if PLATFORM(MAC) || PLATFORM(CHROMIUM)
#include "WebCoreSystemInterface.h"
#endif
#if PLATFORM(WIN)
#include <WebKitSystemInterface/WebKitSystemInterface.h>
#endif
namespace WebCore {
RetainPtr<CGImageRef> Image::imageWithColorSpace(CGImageRef originalImage, ColorSpace colorSpace)
{
CGColorSpaceRef originalColorSpace = CGImageGetColorSpace(originalImage);
// If the image already has a (non-device) color space, we don't want to
// override it, so return.
if (!originalColorSpace || !CFEqual(originalColorSpace, deviceRGBColorSpaceRef()))
return originalImage;
switch (colorSpace) {
case ColorSpaceDeviceRGB:
return originalImage;
case ColorSpaceSRGB:
return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateCopyWithColorSpace(originalImage, sRGBColorSpaceRef()));
case ColorSpaceLinearRGB:
return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateCopyWithColorSpace(originalImage, linearRGBColorSpaceRef()));
}
ASSERT_NOT_REACHED();
return originalImage;
}
static void drawPatternCallback(void* info, CGContextRef context)
{
CGImageRef image = (CGImageRef)info;
CGContextDrawImage(context, GraphicsContext(context).roundToDevicePixels(FloatRect(0, 0, CGImageGetWidth(image), CGImageGetHeight(image))), image);
}
void Image::drawPattern(GraphicsContext* ctxt, const FloatRect& tileRect, const AffineTransform& patternTransform,
const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator op, const FloatRect& destRect)
{
if (!nativeImageForCurrentFrame())
return;
if (!patternTransform.isInvertible())
return;
CGContextRef context = ctxt->platformContext();
GraphicsContextStateSaver stateSaver(*ctxt);
CGContextClipToRect(context, destRect);
ctxt->setCompositeOperation(op);
CGContextTranslateCTM(context, destRect.x(), destRect.y() + destRect.height());
CGContextScaleCTM(context, 1, -1);
// Compute the scaled tile size.
float scaledTileHeight = tileRect.height() * narrowPrecisionToFloat(patternTransform.d());
// We have to adjust the phase to deal with the fact we're in Cartesian space now (with the bottom left corner of destRect being
// the origin).
float adjustedX = phase.x() - destRect.x() + tileRect.x() * narrowPrecisionToFloat(patternTransform.a()); // We translated the context so that destRect.x() is the origin, so subtract it out.
float adjustedY = destRect.height() - (phase.y() - destRect.y() + tileRect.y() * narrowPrecisionToFloat(patternTransform.d()) + scaledTileHeight);
CGImageRef tileImage = nativeImageForCurrentFrame();
float h = CGImageGetHeight(tileImage);
RetainPtr<CGImageRef> subImage;
if (tileRect.size() == size())
subImage = tileImage;
else {
// Copying a sub-image out of a partially-decoded image stops the decoding of the original image. It should never happen
// because sub-images are only used for border-image, which only renders when the image is fully decoded.
ASSERT(h == height());
subImage.adoptCF(CGImageCreateWithImageInRect(tileImage, tileRect));
}
// Adjust the color space.
subImage = Image::imageWithColorSpace(subImage.get(), styleColorSpace);
// Leopard has an optimized call for the tiling of image patterns, but we can only use it if the image has been decoded enough that
// its buffer is the same size as the overall image. Because a partially decoded CGImageRef with a smaller width or height than the
// overall image buffer needs to tile with "gaps", we can't use the optimized tiling call in that case.
// FIXME: We cannot use CGContextDrawTiledImage with scaled tiles on Leopard, because it suffers from rounding errors. Snow Leopard is ok.
float scaledTileWidth = tileRect.width() * narrowPrecisionToFloat(patternTransform.a());
float w = CGImageGetWidth(tileImage);
#if !PLATFORM(IOS) && __MAC_OS_X_VERSION_MIN_REQUIRED == 1050
if (w == size().width() && h == size().height() && scaledTileWidth == tileRect.width() && scaledTileHeight == tileRect.height())
#else
if (w == size().width() && h == size().height())
#endif
CGContextDrawTiledImage(context, FloatRect(adjustedX, adjustedY, scaledTileWidth, scaledTileHeight), subImage.get());
else {
// On Leopard and newer, this code now only runs for partially decoded images whose buffers do not yet match the overall size of the image.
static const CGPatternCallbacks patternCallbacks = { 0, drawPatternCallback, NULL };
CGAffineTransform matrix = CGAffineTransformMake(narrowPrecisionToCGFloat(patternTransform.a()), 0, 0, narrowPrecisionToCGFloat(patternTransform.d()), adjustedX, adjustedY);
matrix = CGAffineTransformConcat(matrix, CGContextGetCTM(context));
// The top of a partially-decoded image is drawn at the bottom of the tile. Map it to the top.
matrix = CGAffineTransformTranslate(matrix, 0, size().height() - h);
RetainPtr<CGPatternRef> pattern(AdoptCF, CGPatternCreate(subImage.get(), CGRectMake(0, 0, tileRect.width(), tileRect.height()),
matrix, tileRect.width(), tileRect.height(),
kCGPatternTilingConstantSpacing, true, &patternCallbacks));
if (!pattern)
return;
RetainPtr<CGColorSpaceRef> patternSpace(AdoptCF, CGColorSpaceCreatePattern(0));
CGFloat alpha = 1;
RetainPtr<CGColorRef> color(AdoptCF, CGColorCreateWithPattern(patternSpace.get(), pattern.get(), &alpha));
CGContextSetFillColorSpace(context, patternSpace.get());
// FIXME: Really want a public API for this. It is just CGContextSetBaseCTM(context, CGAffineTransformIdentiy).
wkSetBaseCTM(context, CGAffineTransformIdentity);
CGContextSetPatternPhase(context, CGSizeZero);
CGContextSetFillColorWithColor(context, color.get());
CGContextFillRect(context, CGContextGetClipBoundingBox(context));
}
stateSaver.restore();
if (imageObserver())
imageObserver()->didDraw(this);
}
}
#endif // USE(CG)
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