diff options
Diffstat (limited to 'WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp')
| -rw-r--r-- | WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp | 158 |
1 files changed, 132 insertions, 26 deletions
diff --git a/WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp b/WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp index 3b90bdc..de0690f 100644 --- a/WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp +++ b/WebCore/platform/image-decoders/bmp/BMPImageDecoder.cpp @@ -1,42 +1,148 @@ /* - * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. - * + * Copyright (c) 2008, 2009, Google Inc. All rights reserved. + * * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY - * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ - + #include "config.h" #include "BMPImageDecoder.h" -namespace WebCore +#include "BMPImageReader.h" + +namespace WebCore { + +// Number of bits in .BMP used to store the file header (doesn't match +// "sizeof(BMPImageDecoder::BitmapFileHeader)" since we omit some fields and +// don't pack). +static const size_t sizeOfFileHeader = 14; + +BMPImageDecoder::BMPImageDecoder() + : ImageDecoder() + , m_allDataReceived(false) + , m_decodedOffset(0) { +} -bool BMPImageDecoder::isSizeAvailable() const +void BMPImageDecoder::setData(SharedBuffer* data, bool allDataReceived) { - return false; + if (failed()) + return; + + ImageDecoder::setData(data, allDataReceived); + m_allDataReceived = allDataReceived; + if (m_reader) + m_reader->setData(data); } - + +bool BMPImageDecoder::isSizeAvailable() +{ + if (!ImageDecoder::isSizeAvailable() && !failed()) + decodeWithCheckForDataEnded(true); + + return ImageDecoder::isSizeAvailable(); +} + RGBA32Buffer* BMPImageDecoder::frameBufferAtIndex(size_t index) { - return 0; + if (index) + return 0; + + if (m_frameBufferCache.isEmpty()) + m_frameBufferCache.resize(1); + + RGBA32Buffer* buffer = &m_frameBufferCache.first(); + if (buffer->status() != RGBA32Buffer::FrameComplete && !failed()) + decodeWithCheckForDataEnded(false); + return buffer; +} + +void BMPImageDecoder::decodeWithCheckForDataEnded(bool onlySize) +{ + if (failed()) + return; + + // If we couldn't decode the image but we've received all the data, decoding + // has failed. + if (!decode(onlySize) && m_allDataReceived) + setFailed(); +} + +bool BMPImageDecoder::decode(bool onlySize) +{ + size_t imgDataOffset = 0; + if ((m_decodedOffset < sizeOfFileHeader) + && !processFileHeader(&imgDataOffset)) + return false; + + if (!m_reader) { + m_reader.set(new BMPImageReader(this, m_decodedOffset, imgDataOffset, + false)); + m_reader->setData(m_data.get()); + } + + if (!m_frameBufferCache.isEmpty()) + m_reader->setBuffer(&m_frameBufferCache.first()); + + return m_reader->decodeBMP(onlySize); +} + +bool BMPImageDecoder::processFileHeader(size_t* imgDataOffset) +{ + ASSERT(imgDataOffset); + + // Read file header. + ASSERT(!m_decodedOffset); + if (m_data->size() < sizeOfFileHeader) + return false; + const uint16_t fileType = + (m_data->data()[0] << 8) | static_cast<uint8_t>(m_data->data()[1]); + *imgDataOffset = readUint32(10); + m_decodedOffset = sizeOfFileHeader; + + // See if this is a bitmap filetype we understand. + enum { + BMAP = 0x424D, // "BM" + // The following additional OS/2 2.x header values (see + // http://www.fileformat.info/format/os2bmp/egff.htm ) aren't widely + // decoded, and are unlikely to be in much use. + /* + ICON = 0x4943, // "IC" + POINTER = 0x5054, // "PT" + COLORICON = 0x4349, // "CI" + COLORPOINTER = 0x4350, // "CP" + BITMAPARRAY = 0x4241, // "BA" + */ + }; + if (fileType != BMAP) { + setFailed(); + return false; + } + + return true; } } // namespace WebCore |