1 /*
2 * Copyright (C) 2005, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2005 Ben La Monica <ben.lamonica@gmail.com>. All rights reserved.
4 * Copyright (C) 2011 Brent Fulgham. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 // FIXME: We need to be able to include these defines from a config.h somewhere.
29 #define JS_EXPORT_PRIVATE
30 #define WTF_EXPORT_PRIVATE
31
32 #include <cairo.h>
33 #include <stdio.h>
34 #include <wtf/Platform.h>
35 #include <wtf/RefPtr.h>
36 #include <wtf/RetainPtr.h>
37
38 #if PLATFORM(WIN)
39 #include <fcntl.h>
40 #include <io.h>
41 #include <windows.h>
42 #include <wtf/MathExtras.h>
43 #endif
44
45 using namespace std;
46
47 static const int s_bufferSize = 2048;
48 static const int s_bytesPerPixel = 4;
49 static cairo_user_data_key_t s_imageDataKey;
50
51
52 #if PLATFORM(WIN)
53 #undef min
54 #undef max
55
strtof(const char * inputString,char ** endptr)56 static inline float strtof(const char* inputString, char** endptr)
57 {
58 return strtod(inputString, endptr);
59 }
60 #endif
61
readFromData(void * closure,unsigned char * data,unsigned int length)62 static cairo_status_t readFromData(void* closure, unsigned char* data, unsigned int length)
63 {
64 CFMutableDataRef dataSource = reinterpret_cast<CFMutableDataRef>(closure);
65
66 CFRange range = CFRangeMake(0, length);
67 CFDataGetBytes(dataSource, range, data);
68 CFDataDeleteBytes(dataSource, range);
69
70 return CAIRO_STATUS_SUCCESS;
71 }
72
createImageFromStdin(int bytesRemaining)73 static cairo_surface_t* createImageFromStdin(int bytesRemaining)
74 {
75 unsigned char buffer[s_bufferSize];
76 RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
77
78 while (bytesRemaining > 0) {
79 size_t bytesToRead = min(bytesRemaining, s_bufferSize);
80 size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
81 CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
82 bytesRemaining -= static_cast<int>(bytesRead);
83 }
84
85 return cairo_image_surface_create_from_png_stream (static_cast<cairo_read_func_t>(readFromData), data.get());
86 }
87
releaseMallocBuffer(void * data)88 static void releaseMallocBuffer(void* data)
89 {
90 free(data);
91 }
92
pixelDifference(float expected,float actual)93 static inline float pixelDifference(float expected, float actual)
94 {
95 return (actual - expected) / max<float>(255 - expected, expected);
96 }
97
normalizeBuffer(float maxDistance,unsigned char * buffer,size_t length)98 static inline void normalizeBuffer(float maxDistance, unsigned char* buffer, size_t length)
99 {
100 if (maxDistance >= 1)
101 return;
102
103 for (size_t p = 0; p < length; ++p)
104 buffer[p] /= maxDistance;
105 }
106
createDifferenceImage(cairo_surface_t * baselineImage,cairo_surface_t * actualImage,float & difference)107 static cairo_surface_t* createDifferenceImage(cairo_surface_t* baselineImage, cairo_surface_t* actualImage, float& difference)
108 {
109 size_t width = cairo_image_surface_get_width(baselineImage);
110 size_t height = cairo_image_surface_get_height(baselineImage);
111
112 unsigned char* baselinePixel = cairo_image_surface_get_data(baselineImage);
113 unsigned char* actualPixel = cairo_image_surface_get_data(actualImage);
114
115 // Compare the content of the 2 bitmaps
116 void* diffBuffer = malloc(width * height);
117 unsigned char* diffPixel = reinterpret_cast<unsigned char*>(diffBuffer);
118
119 float count = 0;
120 float sum = 0;
121 float maxDistance = 0;
122 for (size_t y = 0; y < height; ++y) {
123 for (size_t x = 0; x < width; ++x) {
124 float red = pixelDifference(baselinePixel[0], actualPixel[0]);
125 float green = pixelDifference(baselinePixel[1], actualPixel[1]);
126 float blue = pixelDifference(baselinePixel[2], actualPixel[2]);
127 float alpha = pixelDifference(baselinePixel[3], actualPixel[3]);
128
129 float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0;
130
131 *diffPixel++ = static_cast<unsigned char>(distance * 255);
132
133 if (distance >= 1.0 / 255.0) {
134 ++count;
135 sum += distance;
136 if (distance > maxDistance)
137 maxDistance = distance;
138 }
139
140 baselinePixel += s_bytesPerPixel;
141 actualPixel += s_bytesPerPixel;
142 }
143 }
144
145 // Compute the difference as a percentage combining both the number of different pixels and their difference amount i.e. the average distance over the entire image
146 if (count > 0)
147 difference = 100.0f * sum / (height * width);
148 else
149 difference = 0;
150
151 if (!difference) {
152 free(diffBuffer);
153 return 0;
154 }
155
156 // Generate a normalized diff image
157 normalizeBuffer(maxDistance, reinterpret_cast<unsigned char*>(diffBuffer), height * width);
158
159 cairo_surface_t* diffImage = cairo_image_surface_create_for_data(diffPixel, CAIRO_FORMAT_ARGB32, width, height, width * s_bytesPerPixel);
160 cairo_surface_set_user_data(diffImage, &s_imageDataKey, diffBuffer, releaseMallocBuffer);
161
162 return diffImage;
163 }
164
imageHasAlpha(cairo_surface_t * image)165 static inline bool imageHasAlpha(cairo_surface_t* image)
166 {
167 return (cairo_image_surface_get_format(image) == CAIRO_FORMAT_ARGB32);
168 }
169
writeToData(void * closure,unsigned char * data,unsigned int length)170 static cairo_status_t writeToData(void* closure, unsigned char* data, unsigned int length)
171 {
172 CFMutableDataRef dataTarget = reinterpret_cast<CFMutableDataRef>(closure);
173
174 CFDataAppendBytes(dataTarget, data, length);
175
176 return CAIRO_STATUS_SUCCESS;
177 }
178
main(int argc,const char * argv[])179 int main(int argc, const char* argv[])
180 {
181 #if PLATFORM(WIN)
182 _setmode(0, _O_BINARY);
183 _setmode(1, _O_BINARY);
184 #endif
185
186 float tolerance = 0;
187
188 for (int i = 1; i < argc; ++i) {
189 if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
190 if (i >= argc - 1)
191 exit(1);
192 tolerance = strtof(argv[i + 1], 0);
193 ++i;
194 continue;
195 }
196 }
197
198 char buffer[s_bufferSize];
199 cairo_surface_t* actualImage = 0;
200 cairo_surface_t* baselineImage = 0;
201
202 while (fgets(buffer, sizeof(buffer), stdin)) {
203 char* newLineCharacter = strchr(buffer, '\n');
204 if (newLineCharacter)
205 *newLineCharacter = '\0';
206
207 if (!strncmp("Content-Length: ", buffer, 16)) {
208 strtok(buffer, " ");
209 int imageSize = strtol(strtok(0, " "), 0, 10);
210
211 if (imageSize > 0 && !actualImage)
212 actualImage = createImageFromStdin(imageSize);
213 else if (imageSize > 0 && !baselineImage)
214 baselineImage = createImageFromStdin(imageSize);
215 else
216 fputs("error, image size must be specified.\n", stdout);
217 }
218
219 if (actualImage && baselineImage) {
220 cairo_surface_t* diffImage = 0;
221 float difference = 100.0;
222
223 if ((cairo_image_surface_get_width(actualImage) == cairo_image_surface_get_width(baselineImage))
224 && (cairo_image_surface_get_height(actualImage) == cairo_image_surface_get_height(baselineImage))
225 && (imageHasAlpha(actualImage) == imageHasAlpha(baselineImage))) {
226 diffImage = createDifferenceImage(actualImage, baselineImage, difference); // difference is passed by reference
227 if (difference <= tolerance)
228 difference = 0;
229 else {
230 difference = roundf(difference * 100.0) / 100.0;
231 difference = max<float>(difference, 0.01); // round to 2 decimal places
232 }
233 } else
234 fputs("error, test and reference image have different properties.\n", stderr);
235
236 if (difference > 0.0) {
237 if (diffImage) {
238 RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
239 cairo_surface_write_to_png_stream(diffImage, (cairo_write_func_t)writeToData, imageData.get());
240 printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
241 fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
242 cairo_surface_destroy(diffImage);
243 diffImage = 0;
244 }
245
246 fprintf(stdout, "diff: %01.2f%% failed\n", difference);
247 } else
248 fprintf(stdout, "diff: %01.2f%% passed\n", difference);
249
250 cairo_surface_destroy(actualImage);
251 cairo_surface_destroy(baselineImage);
252 actualImage = 0;
253 baselineImage = 0;
254 }
255
256 fflush(stdout);
257 }
258
259 return 0;
260 }
261