BitmapImageCG.cpp   [plain text]

/*
 * 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 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 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 "BitmapImage.h"

#if USE(CG)

#include "CoreGraphicsSPI.h"
#include "FloatConversion.h"
#include "GeometryUtilities.h"
#include "GraphicsContextCG.h"
#include "ImageObserver.h"
#include "SubimageCacheWithTimer.h"
#include <wtf/RetainPtr.h>

#if USE(APPKIT)
#include <ApplicationServices/ApplicationServices.h>
#endif

#if PLATFORM(COCOA)
#include "WebCoreSystemInterface.h"
#endif

#if PLATFORM(WIN)
#include <WebKitSystemInterface/WebKitSystemInterface.h>
#endif

namespace WebCore {

namespace NativeImage {

IntSize size(const RetainPtr<CGImageRef>& image)
{
    ASSERT(image);
    return IntSize(CGImageGetWidth(image.get()), CGImageGetHeight(image.get()));
}

bool hasAlpha(const RetainPtr<CGImageRef>&)
{
    // FIXME: Answer correctly the question: does the CGImageRef have alpha channnel?
    return true;
}
    
Color singlePixelSolidColor(const RetainPtr<CGImageRef>& image)
{
    ASSERT(image);
    
    if (NativeImage::size(image) != IntSize(1, 1))
        return Color();
    
    unsigned char pixel[4]; // RGBA
    auto bitmapContext = adoptCF(CGBitmapContextCreate(pixel, 1, 1, 8, sizeof(pixel), sRGBColorSpaceRef(),
        kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big));

    if (!bitmapContext)
        return Color();
    
    CGContextSetBlendMode(bitmapContext.get(), kCGBlendModeCopy);
    CGContextDrawImage(bitmapContext.get(), CGRectMake(0, 0, 1, 1), image.get());
    
    if (!pixel[3])
        return Color(0, 0, 0, 0);

    return Color(pixel[0] * 255 / pixel[3], pixel[1] * 255 / pixel[3], pixel[2] * 255 / pixel[3], pixel[3]);
}

}

bool FrameData::clear(bool clearMetadata)
{
    if (clearMetadata)
        m_haveMetadata = false;

    m_subsamplingLevel = 0;

    if (m_image) {
#if CACHE_SUBIMAGES
        subimageCache().clearImage(m_image.get());
#endif
        m_image = nullptr;
        return true;
    }
    return false;
}

CGImageRef BitmapImage::getCGImageRef()
{
    return frameImageAtIndex(0).get();
}

CGImageRef BitmapImage::getFirstCGImageRefOfSize(const IntSize& size)
{
    size_t count = frameCount();
    for (size_t i = 0; i < count; ++i) {
        CGImageRef cgImage = frameImageAtIndex(i).get();
        if (cgImage && IntSize(CGImageGetWidth(cgImage), CGImageGetHeight(cgImage)) == size)
            return cgImage;
    }

    // Fallback to the default CGImageRef if we can't find the right size
    return getCGImageRef();
}

RetainPtr<CFArrayRef> BitmapImage::getCGImageArray()
{
    size_t count = frameCount();
    if (!count)
        return nullptr;
    
    CFMutableArrayRef array = CFArrayCreateMutable(NULL, count, &kCFTypeArrayCallBacks);
    for (size_t i = 0; i < count; ++i) {
        if (CGImageRef currFrame = frameImageAtIndex(i).get())
            CFArrayAppendValue(array, currFrame);
    }
    return adoptCF(array);
}

void BitmapImage::draw(GraphicsContext& ctxt, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode, ImageOrientationDescription description)
{
#if PLATFORM(IOS)
    startAnimation(DoNotCatchUp);
#else
    startAnimation();
#endif

    RetainPtr<CGImageRef> image;
    // Never use subsampled images for drawing into PDF contexts.
    if (wkCGContextIsPDFContext(ctxt.platformContext()))
        image = copyUnscaledFrameImageAtIndex(m_currentFrame);
    else {
        CGRect transformedDestinationRect = CGRectApplyAffineTransform(destRect, CGContextGetCTM(ctxt.platformContext()));
        float subsamplingScale = std::min<float>(1, std::max(transformedDestinationRect.size.width / srcRect.width(), transformedDestinationRect.size.height / srcRect.height()));

        image = frameImageAtIndex(m_currentFrame, subsamplingScale);
    }

    if (!image) // If it's too early we won't have an image yet.
        return;
    
    Color color = singlePixelSolidColor();
    if (color.isValid()) {
        fillWithSolidColor(ctxt, destRect, color, compositeOp);
        return;
    }

    // Subsampling may have given us an image that is smaller than size().
    IntSize imageSize(CGImageGetWidth(image.get()), CGImageGetHeight(image.get()));
    
    // srcRect is in the coordinates of the unsubsampled image, so we have to map it to the subsampled image.
    FloatRect scaledSrcRect = srcRect;
    if (imageSize != m_size) {
        FloatRect originalImageBounds(FloatPoint(), m_size);
        FloatRect subsampledImageBounds(FloatPoint(), imageSize);
        scaledSrcRect = mapRect(srcRect, originalImageBounds, subsampledImageBounds);
    }
    
    ImageOrientation orientation;
    if (description.respectImageOrientation() == RespectImageOrientation)
        orientation = frameOrientationAtIndex(m_currentFrame);

    ctxt.drawNativeImage(image, imageSize, destRect, scaledSrcRect, compositeOp, blendMode, orientation);

    if (imageObserver())
        imageObserver()->didDraw(this);
}

RetainPtr<CGImageRef> BitmapImage::copyUnscaledFrameImageAtIndex(size_t index)
{
    if (index >= frameCount())
        return nullptr;

    if (index >= m_frames.size() || !m_frames[index].m_image)
        cacheFrame(index, 0);

    if (!m_frames[index].m_subsamplingLevel)
        return m_frames[index].m_image;

    return m_source.createFrameImageAtIndex(index);
}

}

#endif // USE(CG)