--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/DumpRenderTree/cg/ImageDiffCG.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,250 @@
+/*
+ * 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;
+}