diff options
Diffstat (limited to 'WebCore/platform/image-decoders/skia/XBMImageDecoder.cpp')
| -rw-r--r-- | WebCore/platform/image-decoders/skia/XBMImageDecoder.cpp | 280 |
1 files changed, 0 insertions, 280 deletions
diff --git a/WebCore/platform/image-decoders/skia/XBMImageDecoder.cpp b/WebCore/platform/image-decoders/skia/XBMImageDecoder.cpp deleted file mode 100644 index 8908504..0000000 --- a/WebCore/platform/image-decoders/skia/XBMImageDecoder.cpp +++ /dev/null @@ -1,280 +0,0 @@ -/* - * 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: - * - * * 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. - */ - -#include "config.h" -#include "XBMImageDecoder.h" - -#include <algorithm> - -namespace WebCore { - -XBMImageDecoder::XBMImageDecoder() - : m_decodeOffset(0) - , m_allDataReceived(false) - , m_decodedHeader(false) - , m_dataType(Unknown) - , m_bitsDecoded(0) -{ -} - -void XBMImageDecoder::setData(SharedBuffer* data, bool allDataReceived) -{ - ImageDecoder::setData(data, allDataReceived); - - const Vector<char>& buf = m_data->buffer(); - if (buf.size() > m_xbmString.size()) - m_xbmString.append(&buf[m_xbmString.size()], buf.size() - m_xbmString.size()); - - m_allDataReceived = allDataReceived; -} - -bool XBMImageDecoder::isSizeAvailable() const -{ - // This method should either (a) not be const, or (b) not be expected to - // do anything that changes m_sizeAvailable. The png and jpeg decoders - // get around this with callbacks from external libraries. - // - // FIXME: Find out if we can patch webkit to take care of this. - if (!ImageDecoder::isSizeAvailable() && !m_failed) - const_cast<XBMImageDecoder*>(this)->decodeXBM(true); - - return !m_failed && ImageDecoder::isSizeAvailable(); -} - -RGBA32Buffer* XBMImageDecoder::frameBufferAtIndex(size_t index) -{ - // Allocate a framebuffer if necessary. New framebuffers have their status - // initialized to RGBA32Buffer::FrameEmpty. - if (m_frameBufferCache.isEmpty()) - m_frameBufferCache.resize(1); - - RGBA32Buffer& frame = m_frameBufferCache[0]; - - // Attempt to get the size if we don't have it yet. - if (!ImageDecoder::isSizeAvailable()) - decodeXBM(true); - - // Size the framebuffer once we know the right size. - if (ImageDecoder::isSizeAvailable() && - frame.status() == RGBA32Buffer::FrameEmpty) { - if (!frame.setSize(size().width(), size().height())) { - m_failed = true; - frame.setStatus(RGBA32Buffer::FrameComplete); - return 0; - } - frame.setStatus(RGBA32Buffer::FramePartial); - } - - // Keep trying to decode until we've got the entire image. - if (frame.status() != RGBA32Buffer::FrameComplete) - decodeXBM(false); - - return &frame; -} - -bool XBMImageDecoder::decodeHeader() -{ - ASSERT(m_decodeOffset <= m_xbmString.size()); - ASSERT(!m_decodedHeader); - - const char* input = m_xbmString.c_str(); - - // At least 2 "#define <string> <unsigned>" sequences are required. These - // specify the width and height of the image. - int width, height; - if (!ImageDecoder::isSizeAvailable()) { - int count; - if (sscanf(&input[m_decodeOffset], "#define %*s %i #define %*s %i%n", - &width, &height, &count) != 2) - return false; - - // The width and height need to follow some rules. - if (width < 0 || width > maxDimension || height < 0 || height > maxDimension) { - // If this happens, decoding should not continue. - setFailed(); - return false; - } - - if (!setSize(width, height)) { - setFailed(); - return false; - } - m_decodeOffset += count; - ASSERT(m_decodeOffset <= m_xbmString.size()); - } - - ASSERT(ImageDecoder::isSizeAvailable()); - - // Now we're looking for something that tells us that we've seen all of the - // "#define <string> <unsigned>" sequences that we're going to. Mozilla - // just looks for " char " or " short ". We'll do the same. - if (m_dataType == Unknown) { - const char* x11hint = " char "; - const char* x11HintLocation = strstr(&input[m_decodeOffset], x11hint); - if (x11HintLocation) { - m_dataType = X11; - m_decodeOffset += ((x11HintLocation - &input[m_decodeOffset]) + strlen(x11hint)); - } else { - const char* x10hint = " short "; - const char* x10HintLocation = strstr(&input[m_decodeOffset], x10hint); - if (x10HintLocation) { - m_dataType = X10; - m_decodeOffset += ((x10HintLocation - &input[m_decodeOffset]) + strlen(x10hint)); - } else - return false; - } - ASSERT(m_decodeOffset <= m_xbmString.size()); - } - - // Find the start of the data. Again, we do what mozilla does and just - // look for a '{' in the input. - const char* found = strchr(&input[m_decodeOffset], '{'); - if (!found) - return false; - - // Advance to character after the '{' - m_decodeOffset += ((found - &input[m_decodeOffset]) + 1); - ASSERT(m_decodeOffset <= m_xbmString.size()); - m_decodedHeader = true; - - return true; -} - -// The data in an XBM file is provided as an array of either "char" or "short" -// values. These values are decoded one at a time using strtoul() and the bits -// are used to set the alpha value for the image. -// -// The value for the color is always set to RGB(0,0,0), the alpha value takes -// care of whether or not the pixel shows up. -// -// Since the data may arrive in chunks, and many prefixes of valid numbers are -// themselves valid numbers, this code needs to check to make sure that the -// value is not truncated. This is done by consuming space after the value -// read until a ',' or a '}' occurs. In a valid XBM, one of these characters -// will occur after each value. -// -// The checks after strtoul are based on Mozilla's nsXBMDecoder.cpp. -bool XBMImageDecoder::decodeDatum(uint16_t* result) -{ - const char* input = m_xbmString.c_str(); - char* endPtr; - const uint16_t value = strtoul(&input[m_decodeOffset], &endPtr, 0); - - // End of input or couldn't decode anything, can't go any further. - if (endPtr == &input[m_decodeOffset] || !*endPtr) - return false; - - // Possibly a hex value truncated at "0x". Need more data. - if (value == 0 && (*endPtr == 'x' || *endPtr == 'X')) - return false; - - // Skip whitespace - while (*endPtr && isspace(*endPtr)) - ++endPtr; - - // Out of input, don't know what comes next. - if (!*endPtr) - return false; - - // If the next non-whitespace character is not one of these, it's an error. - // Every valid entry in the data array needs to be followed by ',' or '}'. - if (*endPtr != ',' && *endPtr != '}') { - setFailed(); - return false; - } - - // At this point we have a value. - *result = value; - - // Skip over the decoded value plus the delimiter (',' or '}'). - m_decodeOffset += ((endPtr - &input[m_decodeOffset]) + 1); - ASSERT(m_decodeOffset <= m_xbmString.size()); - - return true; -} - -bool XBMImageDecoder::decodeData() -{ - ASSERT(m_decodeOffset <= m_xbmString.size()); - ASSERT(m_decodedHeader && !m_frameBufferCache.isEmpty()); - - RGBA32Buffer& frame = m_frameBufferCache[0]; - - ASSERT(frame.status() == RGBA32Buffer::FramePartial); - - const int bitsPerRow = size().width(); - - ASSERT(m_dataType != Unknown); - - while (m_bitsDecoded < (size().width() * size().height())) { - uint16_t value; - if (!decodeDatum(&value)) - return false; - - int x = m_bitsDecoded % bitsPerRow; - const int y = m_bitsDecoded / bitsPerRow; - - // How many bits will be written? - const int bits = std::min(bitsPerRow - x, (m_dataType == X11) ? 8 : 16); - - // Only the alpha channel matters here, so the color values are always - // set to 0. - for (int i = 0; i < bits; ++i) - frame.setRGBA(x++, y, 0, 0, 0, value & (1 << i) ? 255 : 0); - - m_bitsDecoded += bits; - } - - frame.setStatus(RGBA32Buffer::FrameComplete); - - return true; -} - -// Decode as much as we can of the XBM file. -void XBMImageDecoder::decodeXBM(bool sizeOnly) -{ - if (failed()) - return; - - bool decodeResult = false; - - if (!m_decodedHeader) - decodeResult = decodeHeader(); - - if (m_decodedHeader && !sizeOnly) - decodeResult = decodeData(); - - // The header or the data could not be decoded, but there is no more - // data: decoding has failed. - if (!decodeResult && m_allDataReceived) - setFailed(); -} - -} // namespace WebCore |