1563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark/*
2563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * Copyright (C) 2005, 2007 Apple Inc. All rights reserved.
3563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * Copyright (C) 2005 Ben La Monica <ben.lamonica@gmail.com>.  All rights reserved.
4563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark *
5563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * Redistribution and use in source and binary forms, with or without
6563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * modification, are permitted provided that the following conditions
7563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * are met:
8563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * 1. Redistributions of source code must retain the above copyright
9563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark *    notice, this list of conditions and the following disclaimer.
10563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * 2. Redistributions in binary form must reproduce the above copyright
11563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark *    notice, this list of conditions and the following disclaimer in the
12563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark *    documentation and/or other materials provided with the distribution.
13563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark *
14563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
15563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
18563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark */
26563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
27563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#define min min
28563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
292bde8e466a4451c7319e3a072d118917957d6554Steve Block// FIXME: We need to be able to include these defines from a config.h somewhere.
302bde8e466a4451c7319e3a072d118917957d6554Steve Block#define JS_EXPORT_PRIVATE
312bde8e466a4451c7319e3a072d118917957d6554Steve Block#define WTF_EXPORT_PRIVATE
322bde8e466a4451c7319e3a072d118917957d6554Steve Block
33563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <stdio.h>
34563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <wtf/Platform.h>
35563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <wtf/RetainPtr.h>
36563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
37563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#if PLATFORM(WIN)
38563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <winsock2.h>
39563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <windows.h>
40563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <fcntl.h>
41563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <io.h>
42563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <wtf/MathExtras.h>
43563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
44563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
45563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <CoreGraphics/CGBitmapContext.h>
46563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <CoreGraphics/CGImage.h>
47563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <ImageIO/CGImageDestination.h>
48563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
49563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#if PLATFORM(MAC)
50563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#include <LaunchServices/UTCoreTypes.h>
51563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
52563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
53563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#ifndef CGFLOAT_DEFINED
54563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#ifdef __LP64__
55563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarktypedef double CGFloat;
56563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#else
57563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarktypedef float CGFloat;
58563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
59563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#define CGFLOAT_DEFINED 1
60563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
61563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
62563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkusing namespace std;
63563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
64563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#if PLATFORM(WIN)
65563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic inline float strtof(const char *nptr, char **endptr)
66563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
67563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    return strtod(nptr, endptr);
68563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
69563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic const CFStringRef kUTTypePNG = CFSTR("public.png");
70563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
71563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
72563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining)
73563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
74563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    unsigned char buffer[2048];
75563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
76563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
77563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    while (bytesRemaining > 0) {
78563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        size_t bytesToRead = min(bytesRemaining, 2048);
79563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
80563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
81563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        bytesRemaining -= static_cast<int>(bytesRead);
82563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    }
83563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
84563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault));
85563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
86563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
87563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic void releaseMallocBuffer(void* info, const void* data, size_t size)
88563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
89563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    free((void*)data);
90563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
91563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
92563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference)
93563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
94563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    size_t width = CGImageGetWidth(baseImage);
95563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    size_t height = CGImageGetHeight(baseImage);
96563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    size_t rowBytes = width * 4;
970bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch
98563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // Draw base image in bitmap context
99563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    void* baseBuffer = calloc(height, rowBytes);
1000bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
1010bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage);
1020bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch
103563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // Draw test image in bitmap context
104563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    void* buffer = calloc(height, rowBytes);
1050bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
1060bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage);
1070bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch
108563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // Compare the content of the 2 bitmaps
109563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    void* diffBuffer = malloc(width * height);
110563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    float count = 0.0f;
111563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    float sum = 0.0f;
112563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    float maxDistance = 0.0f;
113563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    unsigned char* basePixel = (unsigned char*)baseBuffer;
114563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    unsigned char* pixel = (unsigned char*)buffer;
115563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    unsigned char* diff = (unsigned char*)diffBuffer;
116563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    for (size_t y = 0; y < height; ++y) {
117563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        for (size_t x = 0; x < width; ++x) {
118563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]);
119563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]);
120563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]);
121563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]);
122563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;
123563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
124563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            *diff++ = (unsigned char)(distance * 255.0f);
125563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
126563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            if (distance >= 1.0f / 255.0f) {
127563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                count += 1.0f;
128563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                sum += distance;
129563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                if (distance > maxDistance)
130563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    maxDistance = distance;
131563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            }
132563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
133563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            basePixel += 4;
134563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            pixel += 4;
135563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        }
136563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    }
137563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
138563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // 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
139563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    if (count > 0.0f)
140563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        difference = 100.0f * sum / (height * width);
141563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    else
142563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        difference = 0.0f;
1430bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch
1440bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    RetainPtr<CGImageRef> diffImage;
145563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // Generate a normalized diff image if there is any difference
146563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    if (difference > 0.0f) {
147563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        if (maxDistance < 1.0f) {
148563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            diff = (unsigned char*)diffBuffer;
149563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            for(size_t p = 0; p < height * width; ++p)
150563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                diff[p] = diff[p] / maxDistance;
151563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        }
152563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
1530bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch        static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray();
1540bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch        RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer));
1550bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch        diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault));
156563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    }
157563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    else
158563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        free(diffBuffer);
159563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
160563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    // Destroy drawing buffers
161563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    if (buffer)
162563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        free(buffer);
163563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    if (baseBuffer)
164563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        free(baseBuffer);
165563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
166563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    return diffImage;
167563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
168563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
169563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkstatic inline bool imageHasAlpha(CGImageRef image)
170563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
171563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
172563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
173563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst);
174563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
175563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
176563af33bc48281d19dce701398dbb88cb54fd7ecCary Clarkint main(int argc, const char* argv[])
177563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark{
178563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#if PLATFORM(WIN)
179563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    _setmode(0, _O_BINARY);
180563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    _setmode(1, _O_BINARY);
181563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark#endif
182563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
183563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    float tolerance = 0.0f;
184563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
185563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    for (int i = 1; i < argc; ++i) {
186563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
187563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            if (i >= argc - 1)
188563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                exit(1);
189563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            tolerance = strtof(argv[i + 1], 0);
190563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            ++i;
191563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            continue;
192563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        }
193563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    }
194563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
195563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    char buffer[2048];
196563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    RetainPtr<CGImageRef> actualImage;
197563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    RetainPtr<CGImageRef> baselineImage;
198563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
199563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    while (fgets(buffer, sizeof(buffer), stdin)) {
200563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        // remove the CR
201563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        char* newLineCharacter = strchr(buffer, '\n');
202563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        if (newLineCharacter)
203563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            *newLineCharacter = '\0';
204563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
205563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        if (!strncmp("Content-Length: ", buffer, 16)) {
206563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            strtok(buffer, " ");
207563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            int imageSize = strtol(strtok(0, " "), 0, 10);
208563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
209563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            if (imageSize > 0 && !actualImage)
210563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                actualImage = createImageFromStdin(imageSize);
211563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            else if (imageSize > 0 && !baselineImage)
212563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                baselineImage = createImageFromStdin(imageSize);
213563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            else
214563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                fputs("error, image size must be specified.\n", stdout);
215563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        }
216563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
217563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        if (actualImage && baselineImage) {
218563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            RetainPtr<CGImageRef> diffImage;
219563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            float difference = 100.0f;
220563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
221563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) {
222563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference
223563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                if (difference <= tolerance)
224563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    difference = 0.0f;
225563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                else {
226563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    difference = roundf(difference * 100.0f) / 100.0f;
227563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    difference = max(difference, 0.01f); // round to 2 decimal places
228563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                }
229563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            } else
230563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                fputs("error, test and reference image have different properties.\n", stderr);
231563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
232563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            if (difference > 0.0f) {
233563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                if (diffImage) {
234563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
235563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
236563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0);
237563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    CGImageDestinationFinalize(imageDest.get());
238563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
239563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                    fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
240563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                }
241563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
242563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                fprintf(stdout, "diff: %01.2f%% failed\n", difference);
243563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            } else
244563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark                fprintf(stdout, "diff: %01.2f%% passed\n", difference);
245563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
246563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            actualImage = 0;
247563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark            baselineImage = 0;
248563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        }
249563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
250563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark        fflush(stdout);
251563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    }
252563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark
253563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark    return 0;
254563af33bc48281d19dce701398dbb88cb54fd7ecCary Clark}
255