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 #include <stdio.h>
30 #include <wtf/Platform.h>
31 #include <wtf/RetainPtr.h>
32
33 #if PLATFORM(WIN)
34 #include <winsock2.h>
35 #include <windows.h>
36 #include <fcntl.h>
37 #include <io.h>
38 #include <wtf/MathExtras.h>
39 #endif
40
41 #include <CoreGraphics/CGBitmapContext.h>
42 #include <CoreGraphics/CGImage.h>
43 #include <ImageIO/CGImageDestination.h>
44
45 #if PLATFORM(MAC)
46 #include <LaunchServices/UTCoreTypes.h>
47 #endif
48
49 #ifndef CGFLOAT_DEFINED
50 #ifdef __LP64__
51 typedef double CGFloat;
52 #else
53 typedef float CGFloat;
54 #endif
55 #define CGFLOAT_DEFINED 1
56 #endif
57
58 using namespace std;
59
60 #if PLATFORM(WIN)
strtof(const char * nptr,char ** endptr)61 static inline float strtof(const char *nptr, char **endptr)
62 {
63 return strtod(nptr, endptr);
64 }
65 static const CFStringRef kUTTypePNG = CFSTR("public.png");
66 #endif
67
createImageFromStdin(int bytesRemaining)68 static RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining)
69 {
70 unsigned char buffer[2048];
71 RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
72
73 while (bytesRemaining > 0) {
74 size_t bytesToRead = min(bytesRemaining, 2048);
75 size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
76 CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
77 bytesRemaining -= static_cast<int>(bytesRead);
78 }
79 RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
80 return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault));
81 }
82
releaseMallocBuffer(void * info,const void * data,size_t size)83 static void releaseMallocBuffer(void* info, const void* data, size_t size)
84 {
85 free((void*)data);
86 }
87
createDifferenceImage(CGImageRef baseImage,CGImageRef testImage,float & difference)88 static RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference)
89 {
90 size_t width = CGImageGetWidth(baseImage);
91 size_t height = CGImageGetHeight(baseImage);
92 size_t rowBytes = width * 4;
93
94 // Draw base image in bitmap context
95 void* baseBuffer = calloc(height, rowBytes);
96 RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
97 CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage);
98
99 // Draw test image in bitmap context
100 void* buffer = calloc(height, rowBytes);
101 RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
102 CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage);
103
104 // Compare the content of the 2 bitmaps
105 void* diffBuffer = malloc(width * height);
106 float count = 0.0f;
107 float sum = 0.0f;
108 float maxDistance = 0.0f;
109 unsigned char* basePixel = (unsigned char*)baseBuffer;
110 unsigned char* pixel = (unsigned char*)buffer;
111 unsigned char* diff = (unsigned char*)diffBuffer;
112 for (size_t y = 0; y < height; ++y) {
113 for (size_t x = 0; x < width; ++x) {
114 float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]);
115 float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]);
116 float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]);
117 float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]);
118 float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;
119
120 *diff++ = (unsigned char)(distance * 255.0f);
121
122 if (distance >= 1.0f / 255.0f) {
123 count += 1.0f;
124 sum += distance;
125 if (distance > maxDistance)
126 maxDistance = distance;
127 }
128
129 basePixel += 4;
130 pixel += 4;
131 }
132 }
133
134 // 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
135 if (count > 0.0f)
136 difference = 100.0f * sum / (height * width);
137 else
138 difference = 0.0f;
139
140 RetainPtr<CGImageRef> diffImage;
141 // Generate a normalized diff image if there is any difference
142 if (difference > 0.0f) {
143 if (maxDistance < 1.0f) {
144 diff = (unsigned char*)diffBuffer;
145 for(size_t p = 0; p < height * width; ++p)
146 diff[p] = diff[p] / maxDistance;
147 }
148
149 static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray();
150 RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer));
151 diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault));
152 }
153 else
154 free(diffBuffer);
155
156 // Destroy drawing buffers
157 if (buffer)
158 free(buffer);
159 if (baseBuffer)
160 free(baseBuffer);
161
162 return diffImage;
163 }
164
imageHasAlpha(CGImageRef image)165 static inline bool imageHasAlpha(CGImageRef image)
166 {
167 CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
168
169 return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst);
170 }
171
main(int argc,const char * argv[])172 int main(int argc, const char* argv[])
173 {
174 #if PLATFORM(WIN)
175 _setmode(0, _O_BINARY);
176 _setmode(1, _O_BINARY);
177 #endif
178
179 float tolerance = 0.0f;
180
181 for (int i = 1; i < argc; ++i) {
182 if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
183 if (i >= argc - 1)
184 exit(1);
185 tolerance = strtof(argv[i + 1], 0);
186 ++i;
187 continue;
188 }
189 }
190
191 char buffer[2048];
192 RetainPtr<CGImageRef> actualImage;
193 RetainPtr<CGImageRef> baselineImage;
194
195 while (fgets(buffer, sizeof(buffer), stdin)) {
196 // remove the CR
197 char* newLineCharacter = strchr(buffer, '\n');
198 if (newLineCharacter)
199 *newLineCharacter = '\0';
200
201 if (!strncmp("Content-Length: ", buffer, 16)) {
202 strtok(buffer, " ");
203 int imageSize = strtol(strtok(0, " "), 0, 10);
204
205 if (imageSize > 0 && !actualImage)
206 actualImage = createImageFromStdin(imageSize);
207 else if (imageSize > 0 && !baselineImage)
208 baselineImage = createImageFromStdin(imageSize);
209 else
210 fputs("error, image size must be specified.\n", stdout);
211 }
212
213 if (actualImage && baselineImage) {
214 RetainPtr<CGImageRef> diffImage;
215 float difference = 100.0f;
216
217 if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) {
218 diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference
219 if (difference <= tolerance)
220 difference = 0.0f;
221 else {
222 difference = roundf(difference * 100.0f) / 100.0f;
223 difference = max(difference, 0.01f); // round to 2 decimal places
224 }
225 } else
226 fputs("error, test and reference image have different properties.\n", stderr);
227
228 if (difference > 0.0f) {
229 if (diffImage) {
230 RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
231 RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
232 CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0);
233 CGImageDestinationFinalize(imageDest.get());
234 printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
235 fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
236 }
237
238 fprintf(stdout, "diff: %01.2f%% failed\n", difference);
239 } else
240 fprintf(stdout, "diff: %01.2f%% passed\n", difference);
241
242 actualImage = 0;
243 baselineImage = 0;
244 }
245
246 fflush(stdout);
247 }
248
249 return 0;
250 }
251