1/*
2 * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ShareableBitmap.h"
28
29#include <WebCore/GraphicsContext.h>
30#include <wtf/RetainPtr.h>
31#include "CGUtilities.h"
32
33using namespace WebCore;
34
35namespace WebKit {
36
37static CGBitmapInfo bitmapInfo(ShareableBitmap::Flags flags)
38{
39    CGBitmapInfo info = kCGBitmapByteOrder32Host;
40    if (flags & ShareableBitmap::SupportsAlpha)
41        info |= kCGImageAlphaPremultipliedFirst;
42    else
43        info |= kCGImageAlphaNoneSkipFirst;
44
45    return info;
46}
47
48PassOwnPtr<GraphicsContext> ShareableBitmap::createGraphicsContext()
49{
50    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
51
52
53    ref(); // Balanced by deref in releaseBitmapContextData.
54    RetainPtr<CGContextRef> bitmapContext(AdoptCF, CGBitmapContextCreateWithData(data(),
55        m_size.width(), m_size.height(), 8, m_size.width() * 4, colorSpace.get(),
56        bitmapInfo(m_flags), releaseBitmapContextData, this));
57
58    // We want the origin to be in the top left corner so we flip the backing store context.
59    CGContextTranslateCTM(bitmapContext.get(), 0, m_size.height());
60    CGContextScaleCTM(bitmapContext.get(), 1, -1);
61
62    return adoptPtr(new GraphicsContext(bitmapContext.get()));
63}
64
65void ShareableBitmap::paint(WebCore::GraphicsContext& context, const IntPoint& dstPoint, const IntRect& srcRect)
66{
67    paintImage(context.platformContext(), makeCGImageCopy().get(), dstPoint, srcRect);
68}
69
70RetainPtr<CGImageRef> ShareableBitmap::makeCGImageCopy()
71{
72    OwnPtr<GraphicsContext> graphicsContext = createGraphicsContext();
73    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(graphicsContext->platformContext()));
74    return image;
75}
76
77RetainPtr<CGImageRef> ShareableBitmap::makeCGImage()
78{
79    ref(); // Balanced by deref in releaseDataProviderData.
80    RetainPtr<CGDataProvider> dataProvider(AdoptCF, CGDataProviderCreateWithData(this, data(), sizeInBytes(), releaseDataProviderData));
81
82    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
83    RetainPtr<CGImageRef> image(AdoptCF, CGImageCreate(m_size.width(), m_size.height(), 8, 32, m_size.width() * 4, colorSpace.get(), bitmapInfo(m_flags), dataProvider.get(), 0, false, kCGRenderingIntentDefault));
84    return image;
85}
86
87void ShareableBitmap::releaseBitmapContextData(void* typelessBitmap, void* typelessData)
88{
89    ShareableBitmap* bitmap = static_cast<ShareableBitmap*>(typelessBitmap);
90    ASSERT_UNUSED(typelessData, bitmap->data() == typelessData);
91    bitmap->deref(); // Balanced by ref in createGraphicsContext.
92}
93
94void ShareableBitmap::releaseDataProviderData(void* typelessBitmap, const void* typelessData, size_t)
95{
96    ShareableBitmap* bitmap = static_cast<ShareableBitmap*>(typelessBitmap);
97    ASSERT_UNUSED(typelessData, bitmap->data() == typelessData);
98    bitmap->deref(); // Balanced by ref in createCGImage.
99}
100
101} // namespace WebKit
102