1 /* 2 * Copyright (C) 2009 Apple, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "config.h" 30 #include "PixelDumpSupport.h" 31 32 #include "CyclicRedundancyCheck.h" 33 #include "DumpRenderTree.h" 34 #include "LayoutTestController.h" 35 #include <cstdio> 36 #include <wtf/Assertions.h> 37 #include <wtf/RefPtr.h> 38 #include <wtf/Vector.h> 39 40 #if USE(CG) 41 #include "PixelDumpSupportCG.h" 42 #elif USE(CAIRO) 43 #include "PixelDumpSupportCairo.h" 44 #endif 45 46 void dumpWebViewAsPixelsAndCompareWithExpected(const std::string& expectedHash) 47 { 48 RefPtr<BitmapContext> context; 49 #if PLATFORM(MAC) 50 if (gLayoutTestController->isPrinting()) 51 context = createPagedBitmapContext(); 52 else 53 #endif 54 context = createBitmapContextFromWebView(gLayoutTestController->testOnscreen(), gLayoutTestController->testRepaint(), gLayoutTestController->testRepaintSweepHorizontally(), gLayoutTestController->dumpSelectionRect()); 55 ASSERT(context); 56 57 // Compute the hash of the bitmap context pixels 58 char actualHash[33]; 59 computeMD5HashStringForBitmapContext(context.get(), actualHash); 60 printf("\nActualHash: %s\n", actualHash); 61 62 // Check the computed hash against the expected one and dump image on mismatch 63 bool dumpImage = true; 64 if (expectedHash.length() > 0) { 65 ASSERT(expectedHash.length() == 32); 66 67 printf("\nExpectedHash: %s\n", expectedHash.c_str()); 68 69 if (expectedHash == actualHash) // FIXME: do case insensitive compare 70 dumpImage = false; 71 } 72 73 if (dumpImage) 74 dumpBitmap(context.get(), actualHash); 75 } 76 77 static void appendIntToVector(unsigned number, Vector<unsigned char>& vector) 78 { 79 size_t offset = vector.size(); 80 vector.grow(offset + 4); 81 vector[offset] = ((number >> 24) & 0xff); 82 vector[offset + 1] = ((number >> 16) & 0xff); 83 vector[offset + 2] = ((number >> 8) & 0xff); 84 vector[offset + 3] = (number & 0xff); 85 } 86 87 static void convertChecksumToPNGComment(const char* checksum, Vector<unsigned char>& bytesToAdd) 88 { 89 // Chunks of PNG files are <length>, <type>, <data>, <crc>. 90 static const char textCommentPrefix[] = "\x00\x00\x00\x29tEXtchecksum\x00"; 91 static const size_t prefixLength = sizeof(textCommentPrefix) - 1; // The -1 is for the null at the end of the char[]. 92 static const size_t checksumLength = 32; 93 94 bytesToAdd.append(textCommentPrefix, prefixLength); 95 bytesToAdd.append(checksum, checksumLength); 96 97 Vector<unsigned char> dataToCrc; 98 dataToCrc.append(textCommentPrefix + 4, prefixLength - 4); // Don't include the chunk length in the crc. 99 dataToCrc.append(checksum, checksumLength); 100 unsigned crc32 = computeCrc(dataToCrc); 101 102 appendIntToVector(crc32, bytesToAdd); 103 } 104 105 static size_t offsetAfterIHDRChunk(const unsigned char* data, const size_t dataLength) 106 { 107 const int pngHeaderLength = 8; 108 const int pngIHDRChunkLength = 25; // chunk length + "IHDR" + 13 bytes of data + checksum 109 return pngHeaderLength + pngIHDRChunkLength; 110 } 111 112 void printPNG(const unsigned char* data, const size_t dataLength, const char* checksum) 113 { 114 Vector<unsigned char> bytesToAdd; 115 convertChecksumToPNGComment(checksum, bytesToAdd); 116 117 printf("Content-Type: %s\n", "image/png"); 118 printf("Content-Length: %lu\n", static_cast<unsigned long>(dataLength + bytesToAdd.size())); 119 120 size_t insertOffset = offsetAfterIHDRChunk(data, dataLength); 121 122 fwrite(data, 1, insertOffset, stdout); 123 fwrite(bytesToAdd.data(), 1, bytesToAdd.size(), stdout); 124 125 const size_t bytesToWriteInOneChunk = 1 << 15; 126 data += insertOffset; 127 size_t dataRemainingToWrite = dataLength - insertOffset; 128 while (dataRemainingToWrite) { 129 size_t bytesToWriteInThisChunk = std::min(dataRemainingToWrite, bytesToWriteInOneChunk); 130 size_t bytesWritten = fwrite(data, 1, bytesToWriteInThisChunk, stdout); 131 if (bytesWritten != bytesToWriteInThisChunk) 132 break; 133 dataRemainingToWrite -= bytesWritten; 134 data += bytesWritten; 135 } 136 } 137
