1 files changed, 250 insertions, 0 deletions
diff --git a/Tools/DumpRenderTree/cg/ImageDiffCG.cpp b/Tools/DumpRenderTree/cg/ImageDiffCG.cpp
new file mode 100644
index 0000000..593ba64
--- /dev/null
+++ b/Tools/DumpRenderTree/cg/ImageDiffCG.cpp
@@ -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;
+}