1635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project/* 2635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * Copyright (c) 2008, 2009, Google Inc. All rights reserved. 3635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * 4635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * Redistribution and use in source and binary forms, with or without 5635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * modification, are permitted provided that the following conditions are 6635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * met: 7635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * 8635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * * Redistributions of source code must retain the above copyright 9635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * notice, this list of conditions and the following disclaimer. 10635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * * Redistributions in binary form must reproduce the above 11635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * copyright notice, this list of conditions and the following disclaimer 12635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * in the documentation and/or other materials provided with the 13635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * distribution. 14635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * * Neither the name of Google Inc. nor the names of its 15635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * contributors may be used to endorse or promote products derived from 16635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * this software without specific prior written permission. 17635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * 18635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project */ 30635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 31635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project#include "config.h" 32635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project#include "BMPImageReader.h" 33635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 34635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Projectnamespace WebCore { 35635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 36692e5dbf12901edacf14812a6fae25462920af42Steve BlockBMPImageReader::BMPImageReader(ImageDecoder* parent, size_t decodedAndHeaderOffset, size_t imgDataOffset, bool usesAndMask) 370bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch : m_parent(parent) 380bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch , m_buffer(0) 390bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch , m_decodedOffset(decodedAndHeaderOffset) 400bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch , m_headerOffset(decodedAndHeaderOffset) 410bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch , m_imgDataOffset(imgDataOffset) 42635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_isOS21x(false) 43635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_isOS22x(false) 44635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_isTopDown(false) 45635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_needToProcessBitmasks(false) 46635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_needToProcessColorTable(false) 47635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_tableSizeInBytes(0) 48635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_seenNonZeroAlphaPixel(false) 49635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project , m_seenZeroAlphaPixel(false) 500bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch , m_andMaskState(usesAndMask ? NotYetDecoded : None) 51635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 52635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Clue-in decodeBMP() that we need to detect the correct info header size. 53635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project memset(&m_infoHeader, 0, sizeof(m_infoHeader)); 54635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 55635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 560bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::decodeBMP(bool onlySize) 57635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 58635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Calculate size of info header. 590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!m_infoHeader.biSize && !readInfoHeaderSize()) 600bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 61635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 62635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read and process info header. 63692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_decodedOffset < (m_headerOffset + m_infoHeader.biSize)) && !processInfoHeader()) 640bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 650bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 660bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // processInfoHeader() set the size, so if that's all we needed, we're done. 670bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (onlySize) 680bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return true; 69635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 70635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read and process the bitmasks, if needed. 710bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (m_needToProcessBitmasks && !processBitmasks()) 720bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 73635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 74635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read and process the color table, if needed. 750bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (m_needToProcessColorTable && !processColorTable()) 760bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 77635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 780bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Initialize the framebuffer if needed. 790bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch ASSERT(m_buffer); // Parent should set this before asking us to decode! 8065f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch if (m_buffer->status() == ImageFrame::FrameEmpty) { 81692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_buffer->setSize(m_parent->size().width(), m_parent->size().height())) 8206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); // Unable to allocate. 8365f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch m_buffer->setStatus(ImageFrame::FramePartial); 84635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // setSize() calls eraseARGB(), which resets the alpha flag, so we force 85635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // it back to false here. We'll set it true below in all cases where 86635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // these 0s could actually show through. 870bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(false); 880bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 890bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // For BMPs, the frame always fills the entire image. 902fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_buffer->setOriginalFrameRect(IntRect(IntPoint(), m_parent->size())); 910bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch 92635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (!m_isTopDown) 930bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_coord.setY(m_parent->size().height() - 1); 94635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 95635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 96635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Decode the data. 97635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if ((m_andMaskState != Decoding) && !pastEndOfImage(0)) { 9806ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if ((m_infoHeader.biCompression != RLE4) && (m_infoHeader.biCompression != RLE8) && (m_infoHeader.biCompression != RLE24)) { 9906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen const ProcessingResult result = processNonRLEData(false, 0); 10006ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (result != Success) 10106ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return (result == Failure) ? m_parent->setFailed() : false; 10206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen } else if (!processRLEData()) 1030bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return false; 104635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 105635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 106635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // If the image has an AND mask and there was no alpha data, process the 107635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // mask. 1080bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_andMaskState == NotYetDecoded) && !m_buffer->hasAlpha()) { 109635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Reset decoding coordinates to start of image. 110635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_coord.setX(0); 1110bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_coord.setY(m_isTopDown ? 0 : (m_parent->size().height() - 1)); 112635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 113635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // The AND mask is stored as 1-bit data. 114635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biBitCount = 1; 115635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 116635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_andMaskState = Decoding; 117635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 11806ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (m_andMaskState == Decoding) { 11906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen const ProcessingResult result = processNonRLEData(false, 0); 12006ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (result != Success) 12106ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return (result == Failure) ? m_parent->setFailed() : false; 12206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen } 123635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 124635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Done! 12565f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch m_buffer->setStatus(ImageFrame::FrameComplete); 1260bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return true; 127635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 128635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 1290bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::readInfoHeaderSize() 130635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 131635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Get size of info header. 132635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ASSERT(m_decodedOffset == m_headerOffset); 133692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_decodedOffset > m_data->size()) || ((m_data->size() - m_decodedOffset) < 4)) 134635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 1350bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biSize = readUint32(0); 136635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Don't increment m_decodedOffset here, it just makes the code in 137635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // processInfoHeader() more confusing. 138635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 139635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Don't allow the header to overflow (which would be harmless here, but 140635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // problematic or at least confusing in other places), or to overrun the 141635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // image data. 142692e5dbf12901edacf14812a6fae25462920af42Steve Block if (((m_headerOffset + m_infoHeader.biSize) < m_headerOffset) || (m_imgDataOffset && (m_imgDataOffset < (m_headerOffset + m_infoHeader.biSize)))) 14306ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 144635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 145635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // See if this is a header size we understand: 146635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // OS/2 1.x: 12 147635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biSize == 12) 148635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_isOS21x = true; 149635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Windows V3: 40 150635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project else if ((m_infoHeader.biSize == 40) || isWindowsV4Plus()) 151635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ; 152635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // OS/2 2.x: any multiple of 4 between 16 and 64, inclusive, or 42 or 46 153692e5dbf12901edacf14812a6fae25462920af42Steve Block else if ((m_infoHeader.biSize >= 16) && (m_infoHeader.biSize <= 64) && (!(m_infoHeader.biSize & 3) || (m_infoHeader.biSize == 42) || (m_infoHeader.biSize == 46))) 154635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_isOS22x = true; 155635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project else 15606ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 157635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 1580bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch return true; 159635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 160635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 1610bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::processInfoHeader() 162635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 163635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read info header. 164635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ASSERT(m_decodedOffset == m_headerOffset); 165692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_decodedOffset > m_data->size()) || ((m_data->size() - m_decodedOffset) < m_infoHeader.biSize) || !readInfoHeader()) 166635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 167635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += m_infoHeader.biSize; 168635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 169635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Sanity-check header values. 1700bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!isInfoHeaderValid()) 17106ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 172635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 1730bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch // Set our size. 1740bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (!m_parent->setSize(m_infoHeader.biWidth, m_infoHeader.biHeight)) 17506ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return false; 176635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 177635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For paletted images, bitmaps can set biClrUsed to 0 to mean "all 178635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // colors", so set it to the maximum number of colors for this bit depth. 179635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Also do this for bitmaps that put too large a value here. 180635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biBitCount < 16) { 181692e5dbf12901edacf14812a6fae25462920af42Steve Block const uint32_t maxColors = static_cast<uint32_t>(1) << m_infoHeader.biBitCount; 182692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_infoHeader.biClrUsed || (m_infoHeader.biClrUsed > maxColors)) 183692e5dbf12901edacf14812a6fae25462920af42Steve Block m_infoHeader.biClrUsed = maxColors; 184635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 185635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 186635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For any bitmaps that set their BitCount to the wrong value, reset the 187635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // counts now that we've calculated the number of necessary colors, since 188635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // other code relies on this value being correct. 189635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biCompression == RLE8) 190635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biBitCount = 8; 191635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project else if (m_infoHeader.biCompression == RLE4) 192635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biBitCount = 4; 193635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 194635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Tell caller what still needs to be processed. 195635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biBitCount >= 16) 196635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_needToProcessBitmasks = true; 197692e5dbf12901edacf14812a6fae25462920af42Steve Block else if (m_infoHeader.biBitCount) 198635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_needToProcessColorTable = true; 199635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 200635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 201635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 202635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 2030bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::readInfoHeader() 204635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 205635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Pre-initialize some fields that not all headers set. 206635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biCompression = RGB; 207635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biClrUsed = 0; 208635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 209635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_isOS21x) { 2100bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biWidth = readUint16(4); 2110bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biHeight = readUint16(6); 212635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ASSERT(m_andMaskState == None); // ICO is a Windows format, not OS/2! 2130bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biBitCount = readUint16(10); 214635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 215635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 216635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 2170bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biWidth = readUint32(4); 2180bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biHeight = readUint32(8); 219635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_andMaskState != None) 220635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biHeight /= 2; 2210bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biBitCount = readUint16(14); 222635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 223635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read compression type, if present. 224635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biSize >= 20) { 2250bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch uint32_t biCompression = readUint32(16); 226635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 227635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Detect OS/2 2.x-specific compression types. 228635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if ((biCompression == 3) && (m_infoHeader.biBitCount == 1)) { 229635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biCompression = HUFFMAN1D; 230635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_isOS22x = true; 231635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else if ((biCompression == 4) && (m_infoHeader.biBitCount == 24)) { 232635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biCompression = RLE24; 233635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_isOS22x = true; 2340bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch } else if (biCompression > 5) 23506ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); // Some type we don't understand. 2360bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch else 237692e5dbf12901edacf14812a6fae25462920af42Steve Block m_infoHeader.biCompression = static_cast<CompressionType>(biCompression); 238635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 239635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 240635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read colors used, if present. 241635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biSize >= 36) 2420bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_infoHeader.biClrUsed = readUint32(32); 243635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 244635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Windows V4+ can safely read the four bitmasks from 40-56 bytes in, so do 245635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // that here. If the bit depth is less than 16, these values will be 246635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // ignored by the image data decoders. If the bit depth is at least 16 but 247635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // the compression format isn't BITFIELDS, these values will be ignored and 248635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // overwritten* in processBitmasks(). 249635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // NOTE: We allow alpha here. Microsoft doesn't really document this well, 250635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // but some BMPs appear to use it. 251635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // 252635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For non-Windows V4+, m_bitMasks[] et. al will be initialized later 253635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // during processBitmasks(). 254635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // 255635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // *Except the alpha channel. Bizarrely, some RGB bitmaps expect decoders 256635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // to pay attention to the alpha mask here, so there's a special case in 257635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // processBitmasks() that doesn't always overwrite that value. 258635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (isWindowsV4Plus()) { 2590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[0] = readUint32(40); 2600bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[1] = readUint32(44); 2610bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[2] = readUint32(48); 2620bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[3] = readUint32(52); 263635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 264635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 265635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Detect top-down BMPs. 266635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biHeight < 0) { 267635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_isTopDown = true; 268635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_infoHeader.biHeight = -m_infoHeader.biHeight; 269635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 270635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 271635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 272635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 273635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 274635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Projectbool BMPImageReader::isInfoHeaderValid() const 275635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 276635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Non-positive widths/heights are invalid. (We've already flipped the 277635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // sign of the height for top-down bitmaps.) 278692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_infoHeader.biWidth <= 0) || !m_infoHeader.biHeight) 279635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 280635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 281635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only Windows V3+ has top-down bitmaps. 282635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_isTopDown && (m_isOS21x || m_isOS22x)) 283635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 284635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 285635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only bit depths of 1, 4, 8, or 24 are universally supported. 286692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_infoHeader.biBitCount != 1) && (m_infoHeader.biBitCount != 4) && (m_infoHeader.biBitCount != 8) && (m_infoHeader.biBitCount != 24)) { 287635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Windows V3+ additionally supports bit depths of 0 (for embedded 288635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // JPEG/PNG images), 16, and 32. 289692e5dbf12901edacf14812a6fae25462920af42Steve Block if (m_isOS21x || m_isOS22x || (m_infoHeader.biBitCount && (m_infoHeader.biBitCount != 16) && (m_infoHeader.biBitCount != 32))) 290635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 291635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 292635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 293635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Each compression type is only valid with certain bit depths (except RGB, 294635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // which can be used with any bit depth). Also, some formats do not 295635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // some compression types. 296635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project switch (m_infoHeader.biCompression) { 297635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case RGB: 298692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_infoHeader.biBitCount) 299635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 300635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 301635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 302635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case RLE8: 303635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Supposedly there are undocumented formats like "BitCount = 1, 304635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Compression = RLE4" (which means "4 bit, but with a 2-color table"), 305635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // so also allow the paletted RLE compression types to have too low a 306635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // bit count; we'll correct this later. 307692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_infoHeader.biBitCount || (m_infoHeader.biBitCount > 8)) 308635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 309635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 310635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 311635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case RLE4: 312635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // See comments in RLE8. 313692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_infoHeader.biBitCount || (m_infoHeader.biBitCount > 4)) 314635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 315635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 316635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 317635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case BITFIELDS: 318635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only valid for Windows V3+. 319692e5dbf12901edacf14812a6fae25462920af42Steve Block if (m_isOS21x || m_isOS22x || ((m_infoHeader.biBitCount != 16) && (m_infoHeader.biBitCount != 32))) 320635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 321635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 322635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 323635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case JPEG: 324635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case PNG: 325635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only valid for Windows V3+. 326692e5dbf12901edacf14812a6fae25462920af42Steve Block if (m_isOS21x || m_isOS22x || m_infoHeader.biBitCount) 327635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 328635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 329635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 330635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case HUFFMAN1D: 331635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only valid for OS/2 2.x. 332692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_isOS22x || (m_infoHeader.biBitCount != 1)) 333635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 334635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 335635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 336635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case RLE24: 337635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Only valid for OS/2 2.x. 338692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_isOS22x || (m_infoHeader.biBitCount != 24)) 339635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 340635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 341635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 342635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project default: 343635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Some type we don't understand. This should have been caught in 344635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // readInfoHeader(). 345635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ASSERT_NOT_REACHED(); 346635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 347635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 348635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 349635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Top-down bitmaps cannot be compressed; they must be RGB or BITFIELDS. 350692e5dbf12901edacf14812a6fae25462920af42Steve Block if (m_isTopDown && (m_infoHeader.biCompression != RGB) && (m_infoHeader.biCompression != BITFIELDS)) 351635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 352635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 353635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Reject the following valid bitmap types that we don't currently bother 354635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // decoding. Few other people decode these either, they're unlikely to be 355635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // in much use. 356635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // TODO(pkasting): Consider supporting these someday. 357635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // * Bitmaps larger than 2^16 pixels in either dimension (Windows 358635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // probably doesn't draw these well anyway, and the decoded data would 359635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // take a lot of memory). 360692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_infoHeader.biWidth >= (1 << 16)) || (m_infoHeader.biHeight >= (1 << 16))) 361635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 362635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // * Windows V3+ JPEG-in-BMP and PNG-in-BMP bitmaps (supposedly not found 363635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // in the wild, only used to send data to printers?). 364692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_infoHeader.biCompression == JPEG) || (m_infoHeader.biCompression == PNG)) 365635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 366635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // * OS/2 2.x Huffman-encoded monochrome bitmaps (see 367635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // http://www.fileformat.info/mirror/egff/ch09_05.htm , re: "G31D" 368635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // algorithm). 369635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biCompression == HUFFMAN1D) 370635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 371635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 372635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 373635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 374635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 3750bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::processBitmasks() 376635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 377635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Create m_bitMasks[] values. 378635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biCompression != BITFIELDS) { 379635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // The format doesn't actually use bitmasks. To simplify the decode 380635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // logic later, create bitmasks for the RGB data. For Windows V4+, 381635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // this overwrites the masks we read from the header, which are 382635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // supposed to be ignored in non-BITFIELDS cases. 383635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // 16 bits: MSB <- xRRRRRGG GGGBBBBB -> LSB 384635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // 24/32 bits: MSB <- [AAAAAAAA] RRRRRRRR GGGGGGGG BBBBBBBB -> LSB 385635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const int numBits = (m_infoHeader.biBitCount == 16) ? 5 : 8; 386692e5dbf12901edacf14812a6fae25462920af42Steve Block for (int i = 0; i <= 2; ++i) 387692e5dbf12901edacf14812a6fae25462920af42Steve Block m_bitMasks[i] = ((static_cast<uint32_t>(1) << (numBits * (3 - i))) - 1) ^ ((static_cast<uint32_t>(1) << (numBits * (2 - i))) - 1); 388635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 389635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For Windows V4+ 32-bit RGB, don't overwrite the alpha mask from the 390635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // header (see note in readInfoHeader()). 391635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biBitCount < 32) 392635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitMasks[3] = 0; 393635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project else if (!isWindowsV4Plus()) 394635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitMasks[3] = static_cast<uint32_t>(0xff000000); 395635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else if (!isWindowsV4Plus()) { 396635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For Windows V4+ BITFIELDS mode bitmaps, this was already done when 397635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // we read the info header. 398635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 399635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Fail if we don't have enough file space for the bitmasks. 4000bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch static const size_t SIZEOF_BITMASKS = 12; 401692e5dbf12901edacf14812a6fae25462920af42Steve Block if (((m_headerOffset + m_infoHeader.biSize + SIZEOF_BITMASKS) < (m_headerOffset + m_infoHeader.biSize)) || (m_imgDataOffset && (m_imgDataOffset < (m_headerOffset + m_infoHeader.biSize + SIZEOF_BITMASKS)))) 40206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 403635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 404635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read bitmasks. 4050bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_data->size() - m_decodedOffset) < SIZEOF_BITMASKS) 406635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 4070bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[0] = readUint32(0); 4080bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[1] = readUint32(4); 4090bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_bitMasks[2] = readUint32(8); 410635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // No alpha in anything other than Windows V4+. 411635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitMasks[3] = 0; 412635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 413635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += SIZEOF_BITMASKS; 414635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 415635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 416635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // We've now decoded all the non-image data we care about. Skip anything 417635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // else before the actual raster data. 418635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_imgDataOffset) 419635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset = m_imgDataOffset; 420635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_needToProcessBitmasks = false; 421635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 422635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Check masks and set shift values. 423635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (int i = 0; i < 4; ++i) { 424635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Trim the mask to the allowed bit depth. Some Windows V4+ BMPs 425635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // specify a bogus alpha channel in bits that don't exist in the pixel 426635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // data (for example, bits 25-31 in a 24-bit RGB format). 427635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biBitCount < 32) 428692e5dbf12901edacf14812a6fae25462920af42Steve Block m_bitMasks[i] &= ((static_cast<uint32_t>(1) << m_infoHeader.biBitCount) - 1); 429635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 430635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For empty masks (common on the alpha channel, especially after the 431635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // trimming above), quickly clear the shifts and continue, to avoid an 432635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // infinite loop in the counting code below. 433635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project uint32_t tempMask = m_bitMasks[i]; 434635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (!tempMask) { 435635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitShiftsRight[i] = m_bitShiftsLeft[i] = 0; 436635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project continue; 437635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 438635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 439635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Make sure bitmask does not overlap any other bitmasks. 440635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (int j = 0; j < i; ++j) { 4410bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (tempMask & m_bitMasks[j]) 44206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 443635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 444635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 445635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Count offset into pixel data. 446635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (m_bitShiftsRight[i] = 0; !(tempMask & 1); tempMask >>= 1) 447635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ++m_bitShiftsRight[i]; 448635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 449635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Count size of mask. 450635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (m_bitShiftsLeft[i] = 8; tempMask & 1; tempMask >>= 1) 451635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project --m_bitShiftsLeft[i]; 452635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 453635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Make sure bitmask is contiguous. 4540bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (tempMask) 45506ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 456635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 457635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Since RGBABuffer tops out at 8 bits per channel, adjust the shift 458635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // amounts to use the most significant 8 bits of the channel. 459635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_bitShiftsLeft[i] < 0) { 460635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitShiftsRight[i] -= m_bitShiftsLeft[i]; 461635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_bitShiftsLeft[i] = 0; 462635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 463635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 464635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 465635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 466635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 467635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 4680bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::processColorTable() 469635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 470635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_tableSizeInBytes = m_infoHeader.biClrUsed * (m_isOS21x ? 3 : 4); 471635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 472635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Fail if we don't have enough file space for the color table. 473692e5dbf12901edacf14812a6fae25462920af42Steve Block if (((m_headerOffset + m_infoHeader.biSize + m_tableSizeInBytes) < (m_headerOffset + m_infoHeader.biSize)) || (m_imgDataOffset && (m_imgDataOffset < (m_headerOffset + m_infoHeader.biSize + m_tableSizeInBytes)))) 47406ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 475635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 476635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Read color table. 477692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_decodedOffset > m_data->size()) || ((m_data->size() - m_decodedOffset) < m_tableSizeInBytes)) 478635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 479635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_colorTable.resize(m_infoHeader.biClrUsed); 480635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (size_t i = 0; i < m_infoHeader.biClrUsed; ++i) { 4810bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_colorTable[i].rgbBlue = m_data->data()[m_decodedOffset++]; 4820bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_colorTable[i].rgbGreen = m_data->data()[m_decodedOffset++]; 4830bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_colorTable[i].rgbRed = m_data->data()[m_decodedOffset++]; 484635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Skip padding byte (not present on OS/2 1.x). 485635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (!m_isOS21x) 486635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project ++m_decodedOffset; 487635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 488635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 489635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // We've now decoded all the non-image data we care about. Skip anything 490635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // else before the actual raster data. 491635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_imgDataOffset) 492635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset = m_imgDataOffset; 493635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_needToProcessColorTable = false; 494635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 495635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 496635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 497635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 4980bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdochbool BMPImageReader::processRLEData() 499635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 5000bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (m_decodedOffset > m_data->size()) 501635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 502635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 503635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // RLE decoding is poorly specified. Two main problems: 504635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // (1) Are EOL markers necessary? What happens when we have too many 505635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // pixels for one row? 506635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // http://www.fileformat.info/format/bmp/egff.htm says extra pixels 507635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // should wrap to the next line. Real BMPs I've encountered seem to 508635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // instead expect extra pixels to be ignored until the EOL marker is 509635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // seen, although this has only happened in a few cases and I suspect 510635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // those BMPs may be invalid. So we only change lines on EOL (or Delta 511635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // with dy > 0), and fail in most cases when pixels extend past the end 512635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // of the line. 513635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // (2) When Delta, EOL, or EOF are seen, what happens to the "skipped" 514635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // pixels? 515635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // http://www.daubnet.com/formats/BMP.html says these should be filled 516635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // with color 0. However, the "do nothing" and "don't care" comments 517635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // of other references suggest leaving these alone, i.e. letting them 518635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // be transparent to the background behind the image. This seems to 519635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // match how MSPAINT treats BMPs, so we do that. Note that when we 520635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // actually skip pixels for a case like this, we need to note on the 521635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // framebuffer that we have alpha. 522635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 523635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Impossible to decode row-at-a-time, so just do things as a stream of 524635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // bytes. 525635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project while (true) { 526635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Every entry takes at least two bytes; bail if there isn't enough 527635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // data. 5280bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_data->size() - m_decodedOffset) < 2) 529635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 530635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 531635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // For every entry except EOF, we'd better not have reached the end of 532635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // the image. 5330bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const uint8_t count = m_data->data()[m_decodedOffset]; 5340bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const uint8_t code = m_data->data()[m_decodedOffset + 1]; 535692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((count || (code != 1)) && pastEndOfImage(0)) 53606ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 537635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 538635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Decode. 53906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (!count) { 540635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project switch (code) { 541635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case 0: // Magic token: EOL 542635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Skip any remaining pixels in this row. 5430bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (m_coord.x() < m_parent->size().width()) 5440bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(true); 545635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project moveBufferToNextRow(); 546635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 547635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += 2; 548635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 549635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 550635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case 1: // Magic token: EOF 551635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Skip any remaining pixels in the image. 552692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((m_coord.x() < m_parent->size().width()) || (m_isTopDown ? (m_coord.y() < (m_parent->size().height() - 1)) : (m_coord.y() > 0))) 5530bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(true); 554635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return true; 555635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 556635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project case 2: { // Magic token: Delta 557635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // The next two bytes specify dx and dy. Bail if there isn't 558635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // enough data. 5590bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_data->size() - m_decodedOffset) < 4) 560635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 561635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 562635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Fail if this takes us past the end of the desired row or 563635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // past the end of the image. 5640bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const uint8_t dx = m_data->data()[m_decodedOffset + 2]; 5650bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const uint8_t dy = m_data->data()[m_decodedOffset + 3]; 566692e5dbf12901edacf14812a6fae25462920af42Steve Block if (dx || dy) 5670bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(true); 568692e5dbf12901edacf14812a6fae25462920af42Steve Block if (((m_coord.x() + dx) > m_parent->size().width()) || pastEndOfImage(dy)) 56906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 570635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 571635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Skip intervening pixels. 572635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_coord.move(dx, m_isTopDown ? dy : -dy); 573635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 574635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += 4; 575635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 576635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 577635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 57806ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen default: { // Absolute mode 579635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // |code| pixels specified as in BI_RGB, zero-padded at the end 580635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // to a multiple of 16 bits. 581635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Because processNonRLEData() expects m_decodedOffset to 582635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // point to the beginning of the pixel data, bump it past 583635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // the escape bytes and then reset if decoding failed. 584635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += 2; 58506ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen const ProcessingResult result = processNonRLEData(true, code); 58606ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (result == Failure) 58706ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 58806ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen if (result == InsufficientData) { 589635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset -= 2; 590635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 591635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 592635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project break; 593635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 59406ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen } 595635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else { // Encoded mode 596635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // The following color data is repeated for |count| total pixels. 597635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Strangely, some BMPs seem to specify excessively large counts 598635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // here; ignore pixels past the end of the row. 599692e5dbf12901edacf14812a6fae25462920af42Steve Block const int endX = std::min(m_coord.x() + count, m_parent->size().width()); 600635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 601635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biCompression == RLE24) { 602635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Bail if there isn't enough data. 6030bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_data->size() - m_decodedOffset) < 4) 604635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return false; 605635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 606635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // One BGR triple that we copy |count| times. 607692e5dbf12901edacf14812a6fae25462920af42Steve Block fillRGBA(endX, m_data->data()[m_decodedOffset + 3], m_data->data()[m_decodedOffset + 2], code, 0xff); 608635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += 4; 609635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else { 610635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // RLE8 has one color index that gets repeated; RLE4 has two 611635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // color indexes in the upper and lower 4 bits of the byte, 612635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // which are alternated. 613635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project size_t colorIndexes[2] = {code, code}; 614635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biCompression == RLE4) { 615635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project colorIndexes[0] = (colorIndexes[0] >> 4) & 0xf; 616635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project colorIndexes[1] &= 0xf; 617635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 618692e5dbf12901edacf14812a6fae25462920af42Steve Block if ((colorIndexes[0] >= m_infoHeader.biClrUsed) || (colorIndexes[1] >= m_infoHeader.biClrUsed)) 61906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return m_parent->setFailed(); 620635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (int which = 0; m_coord.x() < endX; ) { 621635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project setI(colorIndexes[which]); 622635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project which = !which; 623635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 624635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 625635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += 2; 626635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 627635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 628635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 629635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 630635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 63106ea8e899e48f1f2f396b70e63fae369f2f23232Kristian MonsenBMPImageReader::ProcessingResult BMPImageReader::processNonRLEData(bool inRLE, int numPixels) 632635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 6330bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (m_decodedOffset > m_data->size()) 63406ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return InsufficientData; 635635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 636635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (!inRLE) 6370bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch numPixels = m_parent->size().width(); 638635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 639635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Fail if we're being asked to decode more pixels than remain in the row. 640635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const int endX = m_coord.x() + numPixels; 6410bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (endX > m_parent->size().width()) 64206ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return Failure; 643635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 644635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Determine how many bytes of data the requested number of pixels 645635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // requires. 646635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const size_t pixelsPerByte = 8 / m_infoHeader.biBitCount; 647635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const size_t bytesPerPixel = m_infoHeader.biBitCount / 8; 648692e5dbf12901edacf14812a6fae25462920af42Steve Block const size_t unpaddedNumBytes = (m_infoHeader.biBitCount < 16) ? ((numPixels + pixelsPerByte - 1) / pixelsPerByte) : (numPixels * bytesPerPixel); 649635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // RLE runs are zero-padded at the end to a multiple of 16 bits. Non-RLE 650635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // data is in rows and is zero-padded to a multiple of 32 bits. 651635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const size_t alignBits = inRLE ? 1 : 3; 652635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const size_t paddedNumBytes = (unpaddedNumBytes + alignBits) & ~alignBits; 653635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 654635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Decode as many rows as we can. (For RLE, where we only want to decode 655635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // one row, we've already checked that this condition is true.) 656635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project while (!pastEndOfImage(0)) { 657635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Bail if we don't have enough data for the desired number of pixels. 6580bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if ((m_data->size() - m_decodedOffset) < paddedNumBytes) 65906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return InsufficientData; 660635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 661635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_infoHeader.biBitCount < 16) { 662635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Paletted data. Pixels are stored little-endian within bytes. 663635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Decode pixels one byte at a time, left to right (so, starting at 664635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // the most significant bits in the byte). 665635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project const uint8_t mask = (1 << m_infoHeader.biBitCount) - 1; 666635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project for (size_t byte = 0; byte < unpaddedNumBytes; ++byte) { 6670bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch uint8_t pixelData = m_data->data()[m_decodedOffset + byte]; 668692e5dbf12901edacf14812a6fae25462920af42Steve Block for (size_t pixel = 0; (pixel < pixelsPerByte) && (m_coord.x() < endX); ++pixel) { 669692e5dbf12901edacf14812a6fae25462920af42Steve Block const size_t colorIndex = (pixelData >> (8 - m_infoHeader.biBitCount)) & mask; 670635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_andMaskState == Decoding) { 671635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // There's no way to accurately represent an AND + XOR 672635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // operation as an RGBA image, so where the AND values 673635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // are 1, we simply set the framebuffer pixels to fully 674635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // transparent, on the assumption that most ICOs on the 675635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // web will not be doing a lot of inverting. 676635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (colorIndex) { 677635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project setRGBA(0, 0, 0, 0); 6780bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(true); 679635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else 680635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_coord.move(1, 0); 681635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else { 6820bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch if (colorIndex >= m_infoHeader.biClrUsed) 68306ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return Failure; 684635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project setI(colorIndex); 685635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 686635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project pixelData <<= m_infoHeader.biBitCount; 687635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 688635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 689635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else { 690635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // RGB data. Decode pixels one at a time, left to right. 691635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project while (m_coord.x() < endX) { 6920bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch const uint32_t pixel = readCurrentPixel(bytesPerPixel); 693635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 694635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Some BMPs specify an alpha channel but don't actually use it 695635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // (it contains all 0s). To avoid displaying these images as 696635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // fully-transparent, decode as if images are fully opaque 697635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // until we actually see a non-zero alpha value; at that point, 698635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // reset any previously-decoded pixels to fully transparent and 699635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // continue decoding based on the real alpha channel values. 700635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // As an optimization, avoid setting "hasAlpha" to true for 701635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // images where all alpha values are 255; opaque images are 702635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // faster to draw. 703635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project int alpha = getAlpha(pixel); 704692e5dbf12901edacf14812a6fae25462920af42Steve Block if (!m_seenNonZeroAlphaPixel && !alpha) { 705635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_seenZeroAlphaPixel = true; 706635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project alpha = 255; 707635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else { 708635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_seenNonZeroAlphaPixel = true; 709635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (m_seenZeroAlphaPixel) { 7102fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_buffer->zeroFillPixelData(); 711635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_seenZeroAlphaPixel = false; 712635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } else if (alpha != 255) 7130bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch m_buffer->setHasAlpha(true); 714635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 715635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 716635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project setRGBA(getComponent(pixel, 0), getComponent(pixel, 1), 717635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project getComponent(pixel, 2), alpha); 718635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 719635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 720635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 721635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Success, keep going. 722635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_decodedOffset += paddedNumBytes; 723635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (inRLE) 72406ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return Success; 725635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project moveBufferToNextRow(); 726635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 727635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 728635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project // Finished decoding whole image. 72906ea8e899e48f1f2f396b70e63fae369f2f23232Kristian Monsen return Success; 730635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 731635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 732635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Projectvoid BMPImageReader::moveBufferToNextRow() 733635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project{ 734635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_coord.move(-m_coord.x(), m_isTopDown ? 1 : -1); 735635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} 736635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 737635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} // namespace WebCore 738