third_party/WebKit/Source/platform/exported/WebImageSkia.cpp

   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
  33 #include "public/platform/WebImage.h"
  34
  35 #include "platform/SharedBuffer.h"
  36 #include "platform/graphics/Image.h"
  37 #include "platform/image-decoders/ImageDecoder.h"
  38 #include "public/platform/WebData.h"
  39 #include "public/platform/WebSize.h"
  40 #include "wtf/OwnPtr.h"
  41 #include "wtf/PassOwnPtr.h"
  42 #include "wtf/PassRefPtr.h"
  43 #include "wtf/Vector.h"
  44 #include <algorithm>
  45
  46 namespace blink {
  47
  48 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
  49 {
  50     RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
  51     OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
  52     if (!decoder)
  53         return WebImage();
  54
  55     decoder->setData(buffer.get(), true);
  56     if (!decoder->isSizeAvailable())
  57         return WebImage();
  58
  59     // Frames are arranged by decreasing size, then decreasing bit depth.
  60     // Pick the frame closest to |desiredSize|'s area without being smaller,
  61     // which has the highest bit depth.
  62     const size_t frameCount = decoder->frameCount();
  63     size_t index = 0; // Default to first frame if none are large enough.
  64     int frameAreaAtIndex = 0;
  65     for (size_t i = 0; i < frameCount; ++i) {
  66         const IntSize frameSize = decoder->frameSizeAtIndex(i);
  67         if (WebSize(frameSize) == desiredSize) {
  68             index = i;
  69             break; // Perfect match.
  70         }
  71
  72         const int frameArea = frameSize.width() * frameSize.height();
  73         if (frameArea < (desiredSize.width * desiredSize.height))
  74             break; // No more frames that are large enough.
  75
  76         if (!i || (frameArea < frameAreaAtIndex)) {
  77             index = i; // Closer to desired area than previous best match.
  78             frameAreaAtIndex = frameArea;
  79         }
  80     }
  81
  82     ImageFrame* frame = decoder->frameBufferAtIndex(index);
  83     if (!frame)
  84         return WebImage();
  85
  86     return WebImage(frame->bitmap());
  87 }
  88
  89 WebVector<WebImage> WebImage::framesFromData(const WebData& data)
  90 {
  91     // This is to protect from malicious images. It should be big enough that it's never hit in pracice.
  92     const size_t maxFrameCount = 8;
  93
  94     RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
  95     OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
  96     if (!decoder)
  97         return WebVector<WebImage>();
  98
  99     decoder->setData(buffer.get(), true);
 100     if (!decoder->isSizeAvailable())
 101         return WebVector<WebImage>();
 102
 103     // Frames are arranged by decreasing size, then decreasing bit depth.
 104     // Keep the first frame at every size, has the highest bit depth.
 105     const size_t frameCount = decoder->frameCount();
 106     IntSize lastSize;
 107
 108     Vector<WebImage> frames;
 109     for (size_t i = 0; i < std::min(frameCount, maxFrameCount); ++i) {
 110         const IntSize frameSize = decoder->frameSizeAtIndex(i);
 111         if (frameSize == lastSize)
 112             continue;
 113         lastSize = frameSize;
 114
 115         ImageFrame* frame = decoder->frameBufferAtIndex(i);
 116         if (!frame)
 117             continue;
 118
 119         const SkBitmap& bitmap = frame->bitmap();
 120         if (!bitmap.isNull() && bitmap.isImmutable())
 121             frames.append(WebImage(bitmap));
 122     }
 123
 124     return frames;
 125 }
 126
 127 void WebImage::reset()
 128 {
 129     m_bitmap.reset();
 130 }
 131
 132 void WebImage::assign(const WebImage& image)
 133 {
 134     m_bitmap = image.m_bitmap;
 135 }
 136
 137 bool WebImage::isNull() const
 138 {
 139     return m_bitmap.isNull();
 140 }
 141
 142 WebSize WebImage::size() const
 143 {
 144     return WebSize(m_bitmap.width(), m_bitmap.height());
 145 }
 146
 147 WebImage::WebImage(const PassRefPtr<Image>& image)
 148 {
 149     operator=(image);
 150 }
 151
 152 WebImage& WebImage::operator=(const PassRefPtr<Image>& image)
 153 {
 154     SkBitmap p;
 155     if (image && image->deprecatedBitmapForCurrentFrame(&p))
 156         assign(p);
 157     else
 158         reset();
 159     return *this;
 160 }
 161
 162 } // namespace blink