1 /* 2 * Copyright (C) 2009 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "WebImage.h" 33 34 #include "Image.h" 35 #include "ImageSource.h" 36 #include "SharedBuffer.h" 37 38 #include "WebData.h" 39 #include "WebSize.h" 40 41 #include <CoreGraphics/CGImage.h> 42 43 #include <wtf/PassRefPtr.h> 44 #include <wtf/RetainPtr.h> 45 46 using namespace WebCore; 47 48 namespace WebKit { 49 50 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize) 51 { 52 ImageSource source; 53 source.setData(PassRefPtr<SharedBuffer>(data).get(), true); 54 if (!source.isSizeAvailable()) 55 return WebImage(); 56 57 // Frames are arranged by decreasing size, then decreasing bit depth. 58 // Pick the frame closest to |desiredSize|'s area without being smaller, 59 // which has the highest bit depth. 60 const size_t frameCount = source.frameCount(); 61 size_t index = 0; // Default to first frame if none are large enough. 62 int frameAreaAtIndex = 0; 63 for (size_t i = 0; i < frameCount; ++i) { 64 const IntSize frameSize = source.frameSizeAtIndex(i); 65 if (WebSize(frameSize) == desiredSize) { 66 index = i; 67 break; // Perfect match. 68 } 69 const int frameArea = frameSize.width() * frameSize.height(); 70 if (frameArea < (desiredSize.width * desiredSize.height)) 71 break; // No more frames that are large enough. 72 73 if (!i || (frameArea < frameAreaAtIndex)) { 74 index = i; // Closer to desired area than previous best match. 75 frameAreaAtIndex = frameArea; 76 } 77 } 78 79 RetainPtr<CGImageRef> frame(AdoptCF, source.createFrameAtIndex(index)); 80 if (!frame) 81 return WebImage(); 82 83 return WebImage(frame.get()); 84 } 85 86 void WebImage::reset() 87 { 88 CGImageRelease(m_imageRef); 89 m_imageRef = 0; 90 } 91 92 void WebImage::assign(const WebImage& image) 93 { 94 assign(image.m_imageRef); 95 } 96 97 bool WebImage::isNull() const 98 { 99 return !m_imageRef; 100 } 101 102 WebSize WebImage::size() const 103 { 104 return WebSize(CGImageGetWidth(m_imageRef), CGImageGetHeight(m_imageRef)); 105 } 106 107 WebImage::WebImage(const PassRefPtr<Image>& image) 108 : m_imageRef(0) 109 { 110 NativeImagePtr p; 111 if (image.get() && (p = image->nativeImageForCurrentFrame())) 112 assign(p); 113 } 114 115 WebImage& WebImage::operator=(const PassRefPtr<Image>& image) 116 { 117 NativeImagePtr p; 118 if (image.get() && (p = image->nativeImageForCurrentFrame())) 119 assign(p); 120 else 121 reset(); 122 return *this; 123 } 124 125 void WebImage::assign(CGImageRef imageRef) 126 { 127 // Make sure to retain the imageRef first incase m_imageRef == imageRef. 128 CGImageRetain(imageRef); 129 CGImageRelease(m_imageRef); 130 m_imageRef = imageRef; 131 } 132 133 } // namespace WebKit 134