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
33 using namespace WebCore;
34
35 namespace WebKit {
36
bitmapInfo(ShareableBitmap::Flags flags)37 static 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
createGraphicsContext()48 PassOwnPtr<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
paint(WebCore::GraphicsContext & context,const IntPoint & dstPoint,const IntRect & srcRect)65 void ShareableBitmap::paint(WebCore::GraphicsContext& context, const IntPoint& dstPoint, const IntRect& srcRect)
66 {
67 paintImage(context.platformContext(), makeCGImageCopy().get(), dstPoint, srcRect);
68 }
69
makeCGImageCopy()70 RetainPtr<CGImageRef> ShareableBitmap::makeCGImageCopy()
71 {
72 OwnPtr<GraphicsContext> graphicsContext = createGraphicsContext();
73 RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(graphicsContext->platformContext()));
74 return image;
75 }
76
makeCGImage()77 RetainPtr<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
releaseBitmapContextData(void * typelessBitmap,void * typelessData)87 void 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
releaseDataProviderData(void * typelessBitmap,const void * typelessData,size_t)94 void 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