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/BitmapImage.h>
30#include <WebCore/GraphicsContext.h>
31#include <wtf/RetainPtr.h>
32#include "CGUtilities.h"
33
34using namespace WebCore;
35
36namespace WebKit {
37
38static CGBitmapInfo bitmapInfo(ShareableBitmap::Flags flags)
39{
40    CGBitmapInfo info = kCGBitmapByteOrder32Host;
41    if (flags & ShareableBitmap::SupportsAlpha)
42        info |= kCGImageAlphaPremultipliedFirst;
43    else
44        info |= kCGImageAlphaNoneSkipFirst;
45
46    return info;
47}
48
49std::unique_ptr<GraphicsContext> ShareableBitmap::createGraphicsContext()
50{
51    RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
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 std::make_unique<GraphicsContext>(bitmapContext.get());
63}
64
65void ShareableBitmap::paint(WebCore::GraphicsContext& context, const IntPoint& destination, const IntRect& source)
66{
67    paintImage(context.platformContext(), makeCGImageCopy().get(), 1, destination, source);
68}
69
70void ShareableBitmap::paint(WebCore::GraphicsContext& context, float scaleFactor, const IntPoint& destination, const IntRect& source)
71{
72    paintImage(context.platformContext(), makeCGImageCopy().get(), scaleFactor, destination, source);
73}
74
75RetainPtr<CGImageRef> ShareableBitmap::makeCGImageCopy()
76{
77    auto graphicsContext = createGraphicsContext();
78    RetainPtr<CGImageRef> image = adoptCF(CGBitmapContextCreateImage(graphicsContext->platformContext()));
79    return image;
80}
81
82RetainPtr<CGImageRef> ShareableBitmap::makeCGImage()
83{
84    ref(); // Balanced by deref in releaseDataProviderData.
85    RetainPtr<CGDataProvider> dataProvider = adoptCF(CGDataProviderCreateWithData(this, data(), sizeInBytes(), releaseDataProviderData));
86    return createCGImage(dataProvider.get());
87}
88
89RetainPtr<CGImageRef> ShareableBitmap::createCGImage(CGDataProviderRef dataProvider) const
90{
91    ASSERT_ARG(dataProvider, dataProvider);
92
93    RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
94    RetainPtr<CGImageRef> image = adoptCF(CGImageCreate(m_size.width(), m_size.height(), 8, 32, m_size.width() * 4, colorSpace.get(), bitmapInfo(m_flags), dataProvider, 0, false, kCGRenderingIntentDefault));
95    return image;
96}
97
98void ShareableBitmap::releaseBitmapContextData(void* typelessBitmap, void* typelessData)
99{
100    ShareableBitmap* bitmap = static_cast<ShareableBitmap*>(typelessBitmap);
101    ASSERT_UNUSED(typelessData, bitmap->data() == typelessData);
102    bitmap->deref(); // Balanced by ref in createGraphicsContext.
103}
104
105void ShareableBitmap::releaseDataProviderData(void* typelessBitmap, const void* typelessData, size_t)
106{
107    ShareableBitmap* bitmap = static_cast<ShareableBitmap*>(typelessBitmap);
108    ASSERT_UNUSED(typelessData, bitmap->data() == typelessData);
109    bitmap->deref(); // Balanced by ref in createCGImage.
110}
111
112PassRefPtr<Image> ShareableBitmap::createImage()
113{
114    RetainPtr<CGImageRef> platformImage = makeCGImage();
115    if (!platformImage)
116        return nullptr;
117
118    return BitmapImage::create(platformImage.get());
119}
120
121} // namespace WebKit
122