/*
* 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;
}