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      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 "NativeImageSkia.h"
     37 #include "SharedBuffer.h"
     38 
     39 #include "WebData.h"
     40 #include "WebSize.h"
     41 
     42 #include <wtf/OwnPtr.h>
     43 #include <wtf/PassRefPtr.h>
     44 
     45 using namespace WebCore;
     46 
     47 namespace WebKit {
     48 
     49 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
     50 {
     51     ImageSource source;
     52     source.setData(PassRefPtr<SharedBuffer>(data).get(), true);
     53     if (!source.isSizeAvailable())
     54         return WebImage();
     55 
     56     // Frames are arranged by decreasing size, then decreasing bit depth.
     57     // Pick the frame closest to |desiredSize|'s area without being smaller,
     58     // which has the highest bit depth.
     59     const size_t frameCount = source.frameCount();
     60     size_t index = 0;  // Default to first frame if none are large enough.
     61     int frameAreaAtIndex = 0;
     62     for (size_t i = 0; i < frameCount; ++i) {
     63         const IntSize frameSize = source.frameSizeAtIndex(i);
     64         if (WebSize(frameSize) == desiredSize) {
     65             index = i;
     66             break;  // Perfect match.
     67         }
     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     OwnPtr<NativeImageSkia> frame(source.createFrameAtIndex(index));
     80     if (!frame.get())
     81         return WebImage();
     82 
     83     return WebImage(*frame);
     84 }
     85 
     86 void WebImage::reset()
     87 {
     88     m_bitmap.reset();
     89 }
     90 
     91 void WebImage::assign(const WebImage& image)
     92 {
     93     m_bitmap = image.m_bitmap;
     94 }
     95 
     96 bool WebImage::isNull() const
     97 {
     98     return m_bitmap.isNull();
     99 }
    100 
    101 WebSize WebImage::size() const
    102 {
    103     return WebSize(m_bitmap.width(), m_bitmap.height());
    104 }
    105 
    106 WebImage::WebImage(const PassRefPtr<Image>& image)
    107 {
    108     operator=(image);
    109 }
    110 
    111 WebImage& WebImage::operator=(const PassRefPtr<Image>& image)
    112 {
    113     NativeImagePtr p;
    114     if (image.get() && (p = image->nativeImageForCurrentFrame()))
    115         assign(*p);
    116     else
    117         reset();
    118     return *this;
    119 }
    120 
    121 } // namespace WebKit
    122