third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp

   1 /*
   2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
   3  * Copyright (C) 2008, 2009 Google, Inc.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #include "platform/image-decoders/ImageDecoder.h"
  29
  30 namespace blink {
  31
  32 ImageFrame::ImageFrame()
  33     : m_allocator(0)
  34     , m_hasAlpha(true)
  35     , m_status(FrameEmpty)
  36     , m_duration(0)
  37     , m_disposalMethod(DisposeNotSpecified)
  38     , m_alphaBlendSource(BlendAtopPreviousFrame)
  39     , m_premultiplyAlpha(true)
  40     , m_pixelsChanged(false)
  41     , m_requiredPreviousFrameIndex(kNotFound)
  42 {
  43 }
  44
  45 ImageFrame& ImageFrame::operator=(const ImageFrame& other)
  46 {
  47     if (this == &other)
  48         return *this;
  49
  50     m_bitmap = other.m_bitmap;
  51     // Keep the pixels locked since we will be writing directly into the
  52     // bitmap throughout this object's lifetime.
  53     m_bitmap.lockPixels();
  54     // Be sure to assign this before calling setStatus(), since setStatus() may
  55     // call notifyBitmapIfPixelsChanged().
  56     m_pixelsChanged = other.m_pixelsChanged;
  57     setMemoryAllocator(other.allocator());
  58     setOriginalFrameRect(other.originalFrameRect());
  59     setStatus(other.status());
  60     setDuration(other.duration());
  61     setDisposalMethod(other.disposalMethod());
  62     setAlphaBlendSource(other.alphaBlendSource());
  63     setPremultiplyAlpha(other.premultiplyAlpha());
  64     // Be sure that this is called after we've called setStatus(), since we
  65     // look at our status to know what to do with the alpha value.
  66     setHasAlpha(other.hasAlpha());
  67     setRequiredPreviousFrameIndex(other.requiredPreviousFrameIndex());
  68     return *this;
  69 }
  70
  71 void ImageFrame::clearPixelData()
  72 {
  73     m_bitmap.reset();
  74     m_status = FrameEmpty;
  75     // NOTE: Do not reset other members here; clearFrameBufferCache()
  76     // calls this to free the bitmap data, but other functions like
  77     // initFrameBuffer() and frameComplete() may still need to read
  78     // other metadata out of this frame later.
  79 }
  80
  81 void ImageFrame::zeroFillPixelData()
  82 {
  83     m_bitmap.eraseARGB(0, 0, 0, 0);
  84     m_hasAlpha = true;
  85 }
  86
  87 bool ImageFrame::copyBitmapData(const ImageFrame& other)
  88 {
  89     if (this == &other)
  90         return true;
  91
  92     m_hasAlpha = other.m_hasAlpha;
  93     m_bitmap.reset();
  94     return other.m_bitmap.copyTo(&m_bitmap, other.m_bitmap.colorType());
  95 }
  96
  97 bool ImageFrame::setSize(int newWidth, int newHeight)
  98 {
  99     // setSize() should only be called once, it leaks memory otherwise.
 100     ASSERT(!width() && !height());
 101
 102     m_bitmap.setInfo(SkImageInfo::MakeN32Premul(newWidth, newHeight));
 103     if (!m_bitmap.tryAllocPixels(m_allocator, 0))
 104         return false;
 105
 106     zeroFillPixelData();
 107     return true;
 108 }
 109
 110 const SkBitmap& ImageFrame::bitmap() const
 111 {
 112     return m_bitmap;
 113 }
 114
 115 bool ImageFrame::hasAlpha() const
 116 {
 117     return m_hasAlpha;
 118 }
 119
 120 void ImageFrame::setHasAlpha(bool alpha)
 121 {
 122     m_hasAlpha = alpha;
 123
 124     // If the frame is not fully loaded, there will be transparent pixels,
 125     // so we can't tell skia we're opaque, even for image types that logically
 126     // always are (e.g. jpeg).
 127     if (m_status != FrameComplete)
 128         alpha = true;
 129     m_bitmap.setAlphaType(alpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType);
 130 }
 131
 132 void ImageFrame::setStatus(Status status)
 133 {
 134     m_status = status;
 135     if (m_status == FrameComplete) {
 136         m_bitmap.setAlphaType(m_hasAlpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType);
 137         // Send pending pixels changed notifications now, because we can't do this after
 138         // the bitmap has been marked immutable.
 139         notifyBitmapIfPixelsChanged();
 140         m_bitmap.setImmutable(); // Tell the bitmap it's done.
 141     }
 142 }
 143
 144 void ImageFrame::zeroFillFrameRect(const IntRect& rect)
 145 {
 146     if (rect.isEmpty())
 147         return;
 148
 149     m_bitmap.eraseArea(rect, SkColorSetARGB(0, 0, 0, 0));
 150     setHasAlpha(true);
 151 }
 152
 153 } // namespace blink