1/*
2 * Copyright (C) 2010 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
6 * are met:
7 *
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 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "WEBPImageDecoder.h"
31
32#if USE(WEBP)
33
34#include "webp/decode.h"
35
36namespace WebCore {
37
38WEBPImageDecoder::WEBPImageDecoder(ImageSource::AlphaOption alphaOption,
39                                   ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption)
40    : ImageDecoder(alphaOption, gammaAndColorProfileOption)
41    , m_decoder(0)
42    , m_lastVisibleRow(0)
43{
44}
45
46WEBPImageDecoder::~WEBPImageDecoder()
47{
48}
49
50bool WEBPImageDecoder::isSizeAvailable()
51{
52    if (!ImageDecoder::isSizeAvailable())
53         decode(true);
54
55    return ImageDecoder::isSizeAvailable();
56}
57
58ImageFrame* WEBPImageDecoder::frameBufferAtIndex(size_t index)
59{
60    if (index)
61        return 0;
62
63    if (m_frameBufferCache.isEmpty()) {
64        m_frameBufferCache.resize(1);
65        m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha);
66    }
67
68    ImageFrame& frame = m_frameBufferCache[0];
69    if (frame.status() != ImageFrame::FrameComplete)
70        decode(false);
71    return &frame;
72}
73
74
75bool WEBPImageDecoder::decode(bool onlySize)
76{
77    // Minimum number of bytes needed to ensure one can parse size information.
78    static const size_t sizeOfHeader = 30;
79    // Number of bytes per pixel.
80    static const int bytesPerPixel = 3;
81
82    if (failed())
83        return false;
84
85    const size_t dataSize = m_data->size();
86    if (dataSize < sizeOfHeader)
87        return true;
88
89    int width, height;
90    const uint8_t* dataBytes = reinterpret_cast<const uint8_t*>(m_data->data());
91    if (!WebPGetInfo(dataBytes, dataSize, &width, &height))
92        return setFailed();
93    if (!ImageDecoder::isSizeAvailable() && !setSize(width, height))
94        return setFailed();
95    if (onlySize)
96        return true;
97
98    bool allDataReceived = isAllDataReceived();
99    int stride = width * bytesPerPixel;
100    ASSERT(!m_frameBufferCache.isEmpty());
101    ImageFrame& buffer = m_frameBufferCache[0];
102    if (buffer.status() == ImageFrame::FrameEmpty) {
103        ASSERT(width == size().width());
104        ASSERT(height == size().height());
105        if (!buffer.setSize(width, height))
106            return setFailed();
107        buffer.setStatus(allDataReceived ? ImageFrame::FrameComplete : ImageFrame::FramePartial);
108        // FIXME: We currently hard code false below because libwebp doesn't support alpha yet.
109        buffer.setHasAlpha(false);
110        buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
111        m_rgbOutput.resize(height * stride);
112    }
113    int newLastVisibleRow = 0; // Last completed row.
114    if (allDataReceived) {
115        if (!WebPDecodeRGBInto(dataBytes, dataSize, m_rgbOutput.data(), m_rgbOutput.size(), stride))
116            return setFailed();
117        newLastVisibleRow = height;
118    } else {
119        if (!m_decoder) {
120            m_decoder = WebPINewRGB(MODE_RGB, m_rgbOutput.data(), m_rgbOutput.size(), stride);
121            if (!m_decoder)
122                return setFailed();
123        }
124        const VP8StatusCode status = WebPIUpdate(m_decoder, dataBytes, dataSize);
125        if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED)
126            return setFailed();
127        if (!WebPIDecGetRGB(m_decoder, &newLastVisibleRow, 0, 0, 0))
128            return setFailed();
129        ASSERT(newLastVisibleRow >= 0);
130        ASSERT(newLastVisibleRow <= height);
131    }
132    // FIXME: remove this data copy.
133    for (int y = m_lastVisibleRow; y < newLastVisibleRow; ++y) {
134        const uint8_t* const src = &m_rgbOutput[y * stride];
135        for (int x = 0; x < width; ++x)
136            buffer.setRGBA(x, y, src[bytesPerPixel * x + 0], src[bytesPerPixel * x + 1], src[bytesPerPixel * x + 2], 0xff);
137    }
138    m_lastVisibleRow = newLastVisibleRow;
139    if (m_lastVisibleRow == height)
140         buffer.setStatus(ImageFrame::FrameComplete);
141    return m_lastVisibleRow == height;
142}
143
144}
145
146#endif
147