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
dumpWebViewAsPixelsAndCompareWithExpected(const std::string & expectedHash)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
appendIntToVector(unsigned number,Vector<unsigned char> & vector)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
convertChecksumToPNGComment(const char * checksum,Vector<unsigned char> & bytesToAdd)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
offsetAfterIHDRChunk(const unsigned char * data,const size_t dataLength)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
printPNG(const unsigned char * data,const size_t dataLength,const char * checksum)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