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
30namespace blink {
31
32ImageFrame::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 ENABLE(ASSERT)
43    , m_requiredPreviousFrameIndexValid(false)
44#endif
45{
46}
47
48ImageFrame& 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 ENABLE(ASSERT)
73    m_requiredPreviousFrameIndexValid = other.m_requiredPreviousFrameIndexValid;
74#endif
75    return *this;
76}
77
78void 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
88void ImageFrame::zeroFillPixelData()
89{
90    m_bitmap.eraseARGB(0, 0, 0, 0);
91    m_hasAlpha = true;
92}
93
94bool 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
104bool 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.tryAllocPixels(m_allocator, 0))
111        return false;
112
113    zeroFillPixelData();
114    return true;
115}
116
117PassRefPtr<NativeImageSkia> ImageFrame::asNewNativeImage() const
118{
119    return NativeImageSkia::create(m_bitmap);
120}
121
122bool ImageFrame::hasAlpha() const
123{
124    return m_hasAlpha;
125}
126
127void 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
139void 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
151void 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 blink
161