Tools/DumpRenderTree/cg/ImageDiffCG.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2005, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Ben La Monica <ben.lamonica@gmail.com>.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #define min min

 #include <stdio.h>
 #include <wtf/Platform.h>
 #include <wtf/RetainPtr.h>

 #if PLATFORM(WIN)
 #include <winsock2.h>
 #include <windows.h>
 #include <fcntl.h>
 #include <io.h>
 #include <wtf/MathExtras.h>
 #endif

 #include <CoreGraphics/CGBitmapContext.h>
 #include <CoreGraphics/CGImage.h>
 #include <ImageIO/CGImageDestination.h>

 #if PLATFORM(MAC)
 #include <LaunchServices/UTCoreTypes.h>
 #endif

 #ifndef CGFLOAT_DEFINED
 #ifdef __LP64__
 typedef double CGFloat;
 #else
 typedef float CGFloat;
 #endif
 #define CGFLOAT_DEFINED 1
 #endif

 using namespace std;

 #if PLATFORM(WIN)
 static inline float strtof(const char *nptr, char **endptr)
 {
     return strtod(nptr, endptr);
 }
 static const CFStringRef kUTTypePNG = CFSTR("public.png");
 #endif

 static RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining)
 {
     unsigned char buffer[2048];
     RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));

     while (bytesRemaining > 0) {
         size_t bytesToRead = min(bytesRemaining, 2048);
         size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
         CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
         bytesRemaining -= static_cast<int>(bytesRead);
     }
     RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
     return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault));
 }

 static void releaseMallocBuffer(void* info, const void* data, size_t size)
 {
     free((void*)data);
 }

 static RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference)
 {
     size_t width = CGImageGetWidth(baseImage);
     size_t height = CGImageGetHeight(baseImage);
     size_t rowBytes = width * 4;

     // Draw base image in bitmap context
     void* baseBuffer = calloc(height, rowBytes);
     RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
     CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage);

     // Draw test image in bitmap context
     void* buffer = calloc(height, rowBytes);
     RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
     CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage);

     // Compare the content of the 2 bitmaps
     void* diffBuffer = malloc(width * height);
     float count = 0.0f;
     float sum = 0.0f;
     float maxDistance = 0.0f;
     unsigned char* basePixel = (unsigned char*)baseBuffer;
     unsigned char* pixel = (unsigned char*)buffer;
     unsigned char* diff = (unsigned char*)diffBuffer;
     for (size_t y = 0; y < height; ++y) {
         for (size_t x = 0; x < width; ++x) {
             float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]);
             float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]);
             float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]);
             float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]);
             float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;

             *diff++ = (unsigned char)(distance * 255.0f);

             if (distance >= 1.0f / 255.0f) {
                 count += 1.0f;
                 sum += distance;
                 if (distance > maxDistance)
                     maxDistance = distance;
             }

             basePixel += 4;
             pixel += 4;
         }
     }

     // 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
     if (count > 0.0f)
         difference = 100.0f * sum / (height * width);
     else
         difference = 0.0f;

     RetainPtr<CGImageRef> diffImage;
     // Generate a normalized diff image if there is any difference
     if (difference > 0.0f) {
         if (maxDistance < 1.0f) {
             diff = (unsigned char*)diffBuffer;
             for(size_t p = 0; p < height * width; ++p)
                 diff[p] = diff[p] / maxDistance;
         }

         static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray();
         RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer));
         diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault));
     }
     else
         free(diffBuffer);

     // Destroy drawing buffers
     if (buffer)
         free(buffer);
     if (baseBuffer)
         free(baseBuffer);

     return diffImage;
 }

 static inline bool imageHasAlpha(CGImageRef image)
 {
     CGImageAlphaInfo info = CGImageGetAlphaInfo(image);

     return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst);
 }

 int main(int argc, const char* argv[])
 {
 #if PLATFORM(WIN)
     _setmode(0, _O_BINARY);
     _setmode(1, _O_BINARY);
 #endif

     float tolerance = 0.0f;

     for (int i = 1; i < argc; ++i) {
         if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
             if (i >= argc - 1)
                 exit(1);
             tolerance = strtof(argv[i + 1], 0);
             ++i;
             continue;
         }
     }

     char buffer[2048];
     RetainPtr<CGImageRef> actualImage;
     RetainPtr<CGImageRef> baselineImage;

     while (fgets(buffer, sizeof(buffer), stdin)) {
         // remove the CR
         char* newLineCharacter = strchr(buffer, '\n');
         if (newLineCharacter)
             *newLineCharacter = '\0';

         if (!strncmp("Content-Length: ", buffer, 16)) {
             strtok(buffer, " ");
             int imageSize = strtol(strtok(0, " "), 0, 10);

             if (imageSize > 0 && !actualImage)
                 actualImage = createImageFromStdin(imageSize);
             else if (imageSize > 0 && !baselineImage)
                 baselineImage = createImageFromStdin(imageSize);
             else
                 fputs("error, image size must be specified.\n", stdout);
         }

         if (actualImage && baselineImage) {
             RetainPtr<CGImageRef> diffImage;
             float difference = 100.0f;

             if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) {
                 diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference
                 if (difference <= tolerance)
                     difference = 0.0f;
                 else {
                     difference = roundf(difference * 100.0f) / 100.0f;
                     difference = max(difference, 0.01f); // round to 2 decimal places
                 }
             } else
                 fputs("error, test and reference image have different properties.\n", stderr);

             if (difference > 0.0f) {
                 if (diffImage) {
                     RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
                     RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
                     CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0);
                     CGImageDestinationFinalize(imageDest.get());
                     printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
                     fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
                 }

                 fprintf(stdout, "diff: %01.2f%% failed\n", difference);
             } else
                 fprintf(stdout, "diff: %01.2f%% passed\n", difference);

             actualImage = 0;
             baselineImage = 0;
         }

         fflush(stdout);
     }

     return 0;
 }
	/*
	* Copyright (C) 2005, 2007 Apple Inc. All rights reserved.
	* Copyright (C) 2005 Ben La Monica <ben.lamonica@gmail.com>. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#define min min

	#include <stdio.h>
	#include <wtf/Platform.h>
	#include <wtf/RetainPtr.h>

	#if PLATFORM(WIN)
	#include <winsock2.h>
	#include <windows.h>
	#include <fcntl.h>
	#include <io.h>
	#include <wtf/MathExtras.h>
	#endif

	#include <CoreGraphics/CGBitmapContext.h>
	#include <CoreGraphics/CGImage.h>
	#include <ImageIO/CGImageDestination.h>

	#if PLATFORM(MAC)
	#include <LaunchServices/UTCoreTypes.h>
	#endif

	#ifndef CGFLOAT_DEFINED
	#ifdef __LP64__
	typedef double CGFloat;
	#else
	typedef float CGFloat;
	#endif
	#define CGFLOAT_DEFINED 1
	#endif

	using namespace std;

	#if PLATFORM(WIN)
	static inline float strtof(const char nptr, char *endptr)
	{
	return strtod(nptr, endptr);
	}
	static const CFStringRef kUTTypePNG = CFSTR("public.png");
	#endif

	static RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining)
	{
	unsigned char buffer[2048];
	RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));

	while (bytesRemaining > 0) {
	size_t bytesToRead = min(bytesRemaining, 2048);
	size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
	CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
	bytesRemaining -= static_cast<int>(bytesRead);
	}
	RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
	return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault));
	}

	static void releaseMallocBuffer(void* info, const void* data, size_t size)
	{
	free((void*)data);
	}

	static RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference)
	{
	size_t width = CGImageGetWidth(baseImage);
	size_t height = CGImageGetHeight(baseImage);
	size_t rowBytes = width * 4;

	// Draw base image in bitmap context
	void* baseBuffer = calloc(height, rowBytes);
	RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst \| kCGBitmapByteOrder32Host));
	CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage);

	// Draw test image in bitmap context
	void* buffer = calloc(height, rowBytes);
	RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst \| kCGBitmapByteOrder32Host));
	CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage);

	// Compare the content of the 2 bitmaps
	void* diffBuffer = malloc(width * height);
	float count = 0.0f;
	float sum = 0.0f;
	float maxDistance = 0.0f;
	unsigned char* basePixel = (unsigned char*)baseBuffer;
	unsigned char* pixel = (unsigned char*)buffer;
	unsigned char* diff = (unsigned char*)diffBuffer;
	for (size_t y = 0; y < height; ++y) {
	for (size_t x = 0; x < width; ++x) {
	float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]);
	float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]);
	float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]);
	float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]);
	float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;

	diff++ = (unsigned char)(distance 255.0f);

	if (distance >= 1.0f / 255.0f) {
	count += 1.0f;
	sum += distance;
	if (distance > maxDistance)
	maxDistance = distance;
	}

	basePixel += 4;
	pixel += 4;
	}
	}

	// 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
	if (count > 0.0f)
	difference = 100.0f * sum / (height * width);
	else
	difference = 0.0f;

	RetainPtr<CGImageRef> diffImage;
	// Generate a normalized diff image if there is any difference
	if (difference > 0.0f) {
	if (maxDistance < 1.0f) {
	diff = (unsigned char*)diffBuffer;
	for(size_t p = 0; p < height * width; ++p)
	diff[p] = diff[p] / maxDistance;
	}

	static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray();
	RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer));
	diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault));
	}
	else
	free(diffBuffer);

	// Destroy drawing buffers
	if (buffer)
	free(buffer);
	if (baseBuffer)
	free(baseBuffer);

	return diffImage;
	}

	static inline bool imageHasAlpha(CGImageRef image)
	{
	CGImageAlphaInfo info = CGImageGetAlphaInfo(image);

	return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst);
	}

	int main(int argc, const char* argv[])
	{
	#if PLATFORM(WIN)
	_setmode(0, _O_BINARY);
	_setmode(1, _O_BINARY);
	#endif

	float tolerance = 0.0f;

	for (int i = 1; i < argc; ++i) {
	if (!strcmp(argv[i], "-t") \|\| !strcmp(argv[i], "--tolerance")) {
	if (i >= argc - 1)
	exit(1);
	tolerance = strtof(argv[i + 1], 0);
	++i;
	continue;
	}
	}

	char buffer[2048];
	RetainPtr<CGImageRef> actualImage;
	RetainPtr<CGImageRef> baselineImage;

	while (fgets(buffer, sizeof(buffer), stdin)) {
	// remove the CR
	char* newLineCharacter = strchr(buffer, '\n');
	if (newLineCharacter)
	*newLineCharacter = '\0';

	if (!strncmp("Content-Length: ", buffer, 16)) {
	strtok(buffer, " ");
	int imageSize = strtol(strtok(0, " "), 0, 10);

	if (imageSize > 0 && !actualImage)
	actualImage = createImageFromStdin(imageSize);
	else if (imageSize > 0 && !baselineImage)
	baselineImage = createImageFromStdin(imageSize);
	else
	fputs("error, image size must be specified.\n", stdout);
	}

	if (actualImage && baselineImage) {
	RetainPtr<CGImageRef> diffImage;
	float difference = 100.0f;

	if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) {
	diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference
	if (difference <= tolerance)
	difference = 0.0f;
	else {
	difference = roundf(difference * 100.0f) / 100.0f;
	difference = max(difference, 0.01f); // round to 2 decimal places
	}
	} else
	fputs("error, test and reference image have different properties.\n", stderr);

	if (difference > 0.0f) {
	if (diffImage) {
	RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
	RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
	CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0);
	CGImageDestinationFinalize(imageDest.get());
	printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
	fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
	}

	fprintf(stdout, "diff: %01.2f%% failed\n", difference);
	} else
	fprintf(stdout, "diff: %01.2f%% passed\n", difference);

	actualImage = 0;
	baselineImage = 0;
	}

	fflush(stdout);
	}

	return 0;
	}