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 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #define min min
28
29 // FIXME: We need to be able to include these defines from a config.h somewhere.
30 #define JS_EXPORT_PRIVATE
31 #define WTF_EXPORT_PRIVATE
32
33 #include <stdio.h>
34 #include <wtf/Platform.h>
35 #include <wtf/RetainPtr.h>
36
37 #if PLATFORM(WIN)
38 #include <winsock2.h>
39 #include <windows.h>
40 #include <fcntl.h>
41 #include <io.h>
42 #include <wtf/MathExtras.h>
43 #endif
44
45 #include <CoreGraphics/CGBitmapContext.h>
46 #include <CoreGraphics/CGImage.h>
47 #include <ImageIO/CGImageDestination.h>
48
49 #if PLATFORM(MAC)
50 #include <LaunchServices/UTCoreTypes.h>
51 #endif
52
53 #ifndef CGFLOAT_DEFINED
54 #ifdef __LP64__
55 typedef double CGFloat;
56 #else
57 typedef float CGFloat;
58 #endif
59 #define CGFLOAT_DEFINED 1
60 #endif
61
62 using namespace std;
63
64 #if PLATFORM(WIN)
strtof(const char * nptr,char ** endptr)65 static inline float strtof(const char *nptr, char **endptr)
66 {
67 return strtod(nptr, endptr);
68 }
69 static const CFStringRef kUTTypePNG = CFSTR("public.png");
70 #endif
71
createImageFromStdin(int bytesRemaining)72 static RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining)
73 {
74 unsigned char buffer[2048];
75 RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
76
77 while (bytesRemaining > 0) {
78 size_t bytesToRead = min(bytesRemaining, 2048);
79 size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
80 CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
81 bytesRemaining -= static_cast<int>(bytesRead);
82 }
83 RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
84 return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault));
85 }
86
releaseMallocBuffer(void * info,const void * data,size_t size)87 static void releaseMallocBuffer(void* info, const void* data, size_t size)
88 {
89 free((void*)data);
90 }
91
createDifferenceImage(CGImageRef baseImage,CGImageRef testImage,float & difference)92 static RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference)
93 {
94 size_t width = CGImageGetWidth(baseImage);
95 size_t height = CGImageGetHeight(baseImage);
96 size_t rowBytes = width * 4;
97
98 // Draw base image in bitmap context
99 void* baseBuffer = calloc(height, rowBytes);
100 RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
101 CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage);
102
103 // Draw test image in bitmap context
104 void* buffer = calloc(height, rowBytes);
105 RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
106 CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage);
107
108 // Compare the content of the 2 bitmaps
109 void* diffBuffer = malloc(width * height);
110 float count = 0.0f;
111 float sum = 0.0f;
112 float maxDistance = 0.0f;
113 unsigned char* basePixel = (unsigned char*)baseBuffer;
114 unsigned char* pixel = (unsigned char*)buffer;
115 unsigned char* diff = (unsigned char*)diffBuffer;
116 for (size_t y = 0; y < height; ++y) {
117 for (size_t x = 0; x < width; ++x) {
118 float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]);
119 float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]);
120 float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]);
121 float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]);
122 float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;
123
124 *diff++ = (unsigned char)(distance * 255.0f);
125
126 if (distance >= 1.0f / 255.0f) {
127 count += 1.0f;
128 sum += distance;
129 if (distance > maxDistance)
130 maxDistance = distance;
131 }
132
133 basePixel += 4;
134 pixel += 4;
135 }
136 }
137
138 // 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
139 if (count > 0.0f)
140 difference = 100.0f * sum / (height * width);
141 else
142 difference = 0.0f;
143
144 RetainPtr<CGImageRef> diffImage;
145 // Generate a normalized diff image if there is any difference
146 if (difference > 0.0f) {
147 if (maxDistance < 1.0f) {
148 diff = (unsigned char*)diffBuffer;
149 for(size_t p = 0; p < height * width; ++p)
150 diff[p] = diff[p] / maxDistance;
151 }
152
153 static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray();
154 RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer));
155 diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault));
156 }
157 else
158 free(diffBuffer);
159
160 // Destroy drawing buffers
161 if (buffer)
162 free(buffer);
163 if (baseBuffer)
164 free(baseBuffer);
165
166 return diffImage;
167 }
168
imageHasAlpha(CGImageRef image)169 static inline bool imageHasAlpha(CGImageRef image)
170 {
171 CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
172
173 return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst);
174 }
175
main(int argc,const char * argv[])176 int main(int argc, const char* argv[])
177 {
178 #if PLATFORM(WIN)
179 _setmode(0, _O_BINARY);
180 _setmode(1, _O_BINARY);
181 #endif
182
183 float tolerance = 0.0f;
184
185 for (int i = 1; i < argc; ++i) {
186 if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
187 if (i >= argc - 1)
188 exit(1);
189 tolerance = strtof(argv[i + 1], 0);
190 ++i;
191 continue;
192 }
193 }
194
195 char buffer[2048];
196 RetainPtr<CGImageRef> actualImage;
197 RetainPtr<CGImageRef> baselineImage;
198
199 while (fgets(buffer, sizeof(buffer), stdin)) {
200 // remove the CR
201 char* newLineCharacter = strchr(buffer, '\n');
202 if (newLineCharacter)
203 *newLineCharacter = '\0';
204
205 if (!strncmp("Content-Length: ", buffer, 16)) {
206 strtok(buffer, " ");
207 int imageSize = strtol(strtok(0, " "), 0, 10);
208
209 if (imageSize > 0 && !actualImage)
210 actualImage = createImageFromStdin(imageSize);
211 else if (imageSize > 0 && !baselineImage)
212 baselineImage = createImageFromStdin(imageSize);
213 else
214 fputs("error, image size must be specified.\n", stdout);
215 }
216
217 if (actualImage && baselineImage) {
218 RetainPtr<CGImageRef> diffImage;
219 float difference = 100.0f;
220
221 if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) {
222 diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference
223 if (difference <= tolerance)
224 difference = 0.0f;
225 else {
226 difference = roundf(difference * 100.0f) / 100.0f;
227 difference = max(difference, 0.01f); // round to 2 decimal places
228 }
229 } else
230 fputs("error, test and reference image have different properties.\n", stderr);
231
232 if (difference > 0.0f) {
233 if (diffImage) {
234 RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
235 RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
236 CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0);
237 CGImageDestinationFinalize(imageDest.get());
238 printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
239 fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
240 }
241
242 fprintf(stdout, "diff: %01.2f%% failed\n", difference);
243 } else
244 fprintf(stdout, "diff: %01.2f%% passed\n", difference);
245
246 actualImage = 0;
247 baselineImage = 0;
248 }
249
250 fflush(stdout);
251 }
252
253 return 0;
254 }
255