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      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 WebCore {
     31 
     32 ImageFrame::ImageFrame()
     33     : m_allocator(0)
     34     , m_hasAlpha(false)
     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 #if ASSERT_ENABLED
     43     , m_requiredPreviousFrameIndexValid(false)
     44 #endif
     45 {
     46 }
     47 
     48 ImageFrame& ImageFrame::operator=(const ImageFrame& other)
     49 {
     50     if (this == &other)
     51         return *this;
     52 
     53     m_bitmap = other.m_bitmap;
     54     // Keep the pixels locked since we will be writing directly into the
     55     // bitmap throughout this object's lifetime.
     56     m_bitmap.lockPixels();
     57     // Be sure to assign this before calling setStatus(), since setStatus() may
     58     // call notifyBitmapIfPixelsChanged().
     59     m_pixelsChanged = other.m_pixelsChanged;
     60     setMemoryAllocator(other.allocator());
     61     setOriginalFrameRect(other.originalFrameRect());
     62     setStatus(other.status());
     63     setDuration(other.duration());
     64     setDisposalMethod(other.disposalMethod());
     65     setAlphaBlendSource(other.alphaBlendSource());
     66     setPremultiplyAlpha(other.premultiplyAlpha());
     67     // Be sure that this is called after we've called setStatus(), since we
     68     // look at our status to know what to do with the alpha value.
     69     setHasAlpha(other.hasAlpha());
     70     // Copy raw fields to avoid ASSERT failure in requiredPreviousFrameIndex().
     71     m_requiredPreviousFrameIndex = other.m_requiredPreviousFrameIndex;
     72 #if ASSERT_ENABLED
     73     m_requiredPreviousFrameIndexValid = other.m_requiredPreviousFrameIndexValid;
     74 #endif
     75     return *this;
     76 }
     77 
     78 void ImageFrame::clearPixelData()
     79 {
     80     m_bitmap.reset();
     81     m_status = FrameEmpty;
     82     // NOTE: Do not reset other members here; clearFrameBufferCache()
     83     // calls this to free the bitmap data, but other functions like
     84     // initFrameBuffer() and frameComplete() may still need to read
     85     // other metadata out of this frame later.
     86 }
     87 
     88 void ImageFrame::zeroFillPixelData()
     89 {
     90     m_bitmap.eraseARGB(0, 0, 0, 0);
     91     m_hasAlpha = true;
     92 }
     93 
     94 bool ImageFrame::copyBitmapData(const ImageFrame& other)
     95 {
     96     if (this == &other)
     97         return true;
     98 
     99     m_hasAlpha = other.m_hasAlpha;
    100     m_bitmap.reset();
    101     return other.m_bitmap.copyTo(&m_bitmap, other.m_bitmap.colorType());
    102 }
    103 
    104 bool ImageFrame::setSize(int newWidth, int newHeight)
    105 {
    106     // setSize() should only be called once, it leaks memory otherwise.
    107     ASSERT(!width() && !height());
    108 
    109     m_bitmap.setInfo(SkImageInfo::MakeN32Premul(newWidth, newHeight));
    110     if (!m_bitmap.allocPixels(m_allocator, 0))
    111         return false;
    112 
    113     zeroFillPixelData();
    114     return true;
    115 }
    116 
    117 PassRefPtr<NativeImageSkia> ImageFrame::asNewNativeImage() const
    118 {
    119     return NativeImageSkia::create(m_bitmap);
    120 }
    121 
    122 bool ImageFrame::hasAlpha() const
    123 {
    124     return m_hasAlpha;
    125 }
    126 
    127 void ImageFrame::setHasAlpha(bool alpha)
    128 {
    129     m_hasAlpha = alpha;
    130 
    131     // If the frame is not fully loaded, there will be transparent pixels,
    132     // so we can't tell skia we're opaque, even for image types that logically
    133     // always are (e.g. jpeg).
    134     if (m_status != FrameComplete)
    135         alpha = true;
    136     m_bitmap.setAlphaType(alpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType);
    137 }
    138 
    139 void ImageFrame::setStatus(Status status)
    140 {
    141     m_status = status;
    142     if (m_status == FrameComplete) {
    143         m_bitmap.setAlphaType(m_hasAlpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType);
    144         // Send pending pixels changed notifications now, because we can't do this after
    145         // the bitmap has been marked immutable.
    146         notifyBitmapIfPixelsChanged();
    147         m_bitmap.setImmutable(); // Tell the bitmap it's done.
    148     }
    149 }
    150 
    151 void ImageFrame::zeroFillFrameRect(const IntRect& rect)
    152 {
    153     if (rect.isEmpty())
    154         return;
    155 
    156     m_bitmap.eraseArea(rect, SkColorSetARGB(0, 0, 0, 0));
    157     setHasAlpha(true);
    158 }
    159 
    160 } // namespace WebCore
    161