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/*
* 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 <CoreGraphics/CGBitmapContext.h>
#include <CoreGraphics/CGImage.h>
#include <ImageIO/CGImageDestination.h>
#include <stdio.h>
#include <wtf/Platform.h>
#include <wtf/RetainPtr.h>
#if PLATFORM(WIN)
#include <fcntl.h>
#include <io.h>
#endif
#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 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 RetainPtr<CGContextRef> getDifferenceBitmap(CGImageRef testBitmap, CGImageRef referenceBitmap)
{
// we must have both images to take diff
if (!testBitmap || !referenceBitmap)
return 0;
RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
static CFMutableDataRef data = CFDataCreateMutable(kCFAllocatorDefault, 0);
CFDataSetLength(data, CGImageGetHeight(testBitmap) * CGImageGetBytesPerRow(testBitmap));
RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(CFDataGetMutableBytePtr(data), CGImageGetWidth(testBitmap), CGImageGetHeight(testBitmap),
CGImageGetBitsPerComponent(testBitmap), CGImageGetBytesPerRow(testBitmap), colorSpace.get(), kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst));
CGContextSetBlendMode(context.get(), kCGBlendModeNormal);
CGContextDrawImage(context.get(), CGRectMake(0, 0, static_cast<CGFloat>(CGImageGetWidth(testBitmap)), static_cast<CGFloat>(CGImageGetHeight(testBitmap))), testBitmap);
CGContextSetBlendMode(context.get(), kCGBlendModeDifference);
CGContextDrawImage(context.get(), CGRectMake(0, 0, static_cast<CGFloat>(CGImageGetWidth(referenceBitmap)), static_cast<CGFloat>(CGImageGetHeight(referenceBitmap))), referenceBitmap);
return context;
}
/**
* Counts the number of non-black pixels, and returns the percentage
* of non-black pixels to total pixels in the image.
*/
static float computePercentageDifferent(CGContextRef diffBitmap, unsigned threshold)
{
// if diffBiatmap is nil, then there was an error, and it didn't match.
if (!diffBitmap)
return 100.0f;
size_t pixelsHigh = CGBitmapContextGetHeight(diffBitmap);
size_t pixelsWide = CGBitmapContextGetWidth(diffBitmap);
size_t bytesPerRow = CGBitmapContextGetBytesPerRow(diffBitmap);
unsigned char* pixelRowData = static_cast<unsigned char*>(CGBitmapContextGetData(diffBitmap));
unsigned differences = 0;
// NOTE: This may not be safe when switching between ENDIAN types
for (unsigned row = 0; row < pixelsHigh; row++) {
for (unsigned col = 0; col < (pixelsWide * 4); col += 4) {
unsigned char* red = pixelRowData + col;
unsigned char* green = red + 1;
unsigned char* blue = red + 2;
unsigned distance = *red + *green + *blue;
if (distance > threshold) {
differences++;
// shift the pixels towards white to make them more visible
*red = static_cast<unsigned char>(min(UCHAR_MAX, *red + 100));
*green = static_cast<unsigned char>(min(UCHAR_MAX, *green + 100));
*blue = static_cast<unsigned char>(min(UCHAR_MAX, *blue + 100));
}
}
pixelRowData += bytesPerRow;
}
float totalPixels = static_cast<float>(pixelsHigh * pixelsWide);
return (differences * 100.f) / totalPixels;
}
static void compareImages(CGImageRef actualBitmap, CGImageRef baselineBitmap, unsigned threshold)
{
// prepare the difference blend to check for pixel variations
RetainPtr<CGContextRef> diffBitmap = getDifferenceBitmap(actualBitmap, baselineBitmap);
float percentage = computePercentageDifferent(diffBitmap.get(), threshold);
percentage = (float)((int)(percentage * 100.0f)) / 100.0f; // round to 2 decimal places
// send message to let them know if an image was wrong
if (percentage > 0.0f) {
// since the diff might actually show something, send it to stdout
RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(diffBitmap.get()));
RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));
CGImageDestinationAddImage(imageDest.get(), image.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", percentage);
} else
fprintf(stdout, "diff: %01.2f%% passed\n", percentage);
}
int main(int argc, const char* argv[])
{
#if PLATFORM(WIN)
_setmode(0, _O_BINARY);
_setmode(1, _O_BINARY);
#endif
unsigned threshold = 0;
for (int i = 1; i < argc; ++i) {
if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--threshold")) {
if (i >= argc - 1)
exit(1);
threshold = strtol(argv[i + 1], 0, 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) {
compareImages(actualImage.get(), baselineImage.get(), threshold);
actualImage = 0;
baselineImage = 0;
}
fflush(stdout);
}
return 0;
}
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