1 files changed, 260 insertions, 0 deletions
diff --git a/Tools/DumpRenderTree/win/ImageDiffCairo.cpp b/Tools/DumpRenderTree/win/ImageDiffCairo.cpp
new file mode 100644
index 0000000..d10cc14
--- /dev/null
+++ b/Tools/DumpRenderTree/win/ImageDiffCairo.cpp
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2005, 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2005 Ben La Monica <ben.lamonica@gmail.com>.  All rights reserved.
+ * Copyright (C) 2011 Brent Fulgham. 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.
+ */
+
+// FIXME: We need to be able to include these defines from a config.h somewhere.
+#define JS_EXPORT_PRIVATE
+#define WTF_EXPORT_PRIVATE
+
+#include <cairo.h>
+#include <stdio.h>
+#include <wtf/Platform.h>
+#include <wtf/RefPtr.h>
+#include <wtf/RetainPtr.h>
+
+#if PLATFORM(WIN)
+#include <fcntl.h>
+#include <io.h>
+#include <windows.h>
+#include <wtf/MathExtras.h>
+#endif
+
+using namespace std;
+
+static const int s_bufferSize = 2048;
+static const int s_bytesPerPixel = 4;
+static cairo_user_data_key_t s_imageDataKey;
+
+
+#if PLATFORM(WIN)
+#undef min
+#undef max
+
+static inline float strtof(const char* inputString, char** endptr)
+{
+    return strtod(inputString, endptr);
+}
+#endif
+
+static cairo_status_t readFromData(void* closure, unsigned char* data, unsigned int length)
+{
+    CFMutableDataRef dataSource = reinterpret_cast<CFMutableDataRef>(closure);
+
+    CFRange range = CFRangeMake(0, length);
+    CFDataGetBytes(dataSource, range, data);
+    CFDataDeleteBytes(dataSource, range);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_surface_t* createImageFromStdin(int bytesRemaining)
+{
+    unsigned char buffer[s_bufferSize];
+    RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
+
+    while (bytesRemaining > 0) {
+        size_t bytesToRead = min(bytesRemaining, s_bufferSize);
+        size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
+        CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
+        bytesRemaining -= static_cast<int>(bytesRead);
+    }
+
+    return cairo_image_surface_create_from_png_stream (static_cast<cairo_read_func_t>(readFromData), data.get());
+}
+
+static void releaseMallocBuffer(void* data)
+{
+    free(data);
+}
+
+static inline float pixelDifference(float expected, float actual)
+{
+    return (actual - expected) / max<float>(255 - expected, expected);
+}
+
+static inline void normalizeBuffer(float maxDistance, unsigned char* buffer, size_t length)
+{
+    if (maxDistance >= 1)
+        return;
+
+    for (size_t p = 0; p < length; ++p)
+        buffer[p] /= maxDistance;
+}
+
+static cairo_surface_t* createDifferenceImage(cairo_surface_t* baselineImage, cairo_surface_t* actualImage, float& difference)
+{
+    size_t width = cairo_image_surface_get_width(baselineImage);
+    size_t height = cairo_image_surface_get_height(baselineImage);
+
+    unsigned char* baselinePixel = cairo_image_surface_get_data(baselineImage);
+    unsigned char* actualPixel = cairo_image_surface_get_data(actualImage);
+
+    // Compare the content of the 2 bitmaps
+    void* diffBuffer = malloc(width * height);
+    unsigned char* diffPixel = reinterpret_cast<unsigned char*>(diffBuffer);
+
+    float count = 0;
+    float sum = 0;
+    float maxDistance = 0;
+    for (size_t y = 0; y < height; ++y) {
+        for (size_t x = 0; x < width; ++x) {
+            float red = pixelDifference(baselinePixel[0], actualPixel[0]);
+            float green = pixelDifference(baselinePixel[1], actualPixel[1]);
+            float blue = pixelDifference(baselinePixel[2], actualPixel[2]);
+            float alpha = pixelDifference(baselinePixel[3], actualPixel[3]);
+
+            float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0;
+            
+            *diffPixel++ = static_cast<unsigned char>(distance * 255);
+            
+            if (distance >= 1.0 / 255.0) {
+                ++count;
+                sum += distance;
+                if (distance > maxDistance)
+                    maxDistance = distance;
+            }
+            
+            baselinePixel += s_bytesPerPixel;
+            actualPixel += s_bytesPerPixel;
+        }
+    }
+    
+    // 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)
+        difference = 100.0f * sum / (height * width);
+    else
+        difference = 0;
+
+    if (!difference) {
+        free(diffBuffer);
+        return 0;
+    }
+
+    // Generate a normalized diff image
+    normalizeBuffer(maxDistance, reinterpret_cast<unsigned char*>(diffBuffer), height * width);
+        
+    cairo_surface_t* diffImage = cairo_image_surface_create_for_data(diffPixel, CAIRO_FORMAT_ARGB32, width, height, width * s_bytesPerPixel); 
+    cairo_surface_set_user_data(diffImage, &s_imageDataKey, diffBuffer, releaseMallocBuffer);
+    
+    return diffImage;
+}
+
+static inline bool imageHasAlpha(cairo_surface_t* image)
+{
+    return (cairo_image_surface_get_format(image) == CAIRO_FORMAT_ARGB32);
+}
+
+static cairo_status_t writeToData(void* closure, unsigned char* data, unsigned int length)
+{
+    CFMutableDataRef dataTarget = reinterpret_cast<CFMutableDataRef>(closure);
+
+    CFDataAppendBytes(dataTarget, data, length);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+int main(int argc, const char* argv[])
+{
+#if PLATFORM(WIN)
+    _setmode(0, _O_BINARY);
+    _setmode(1, _O_BINARY);
+#endif
+
+    float tolerance = 0;
+
+    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[s_bufferSize];
+    cairo_surface_t* actualImage = 0;
+    cairo_surface_t* baselineImage = 0;
+
+    while (fgets(buffer, sizeof(buffer), stdin)) {
+        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) {
+            cairo_surface_t* diffImage = 0;
+            float difference = 100.0;
+            
+            if ((cairo_image_surface_get_width(actualImage) == cairo_image_surface_get_width(baselineImage))
+                && (cairo_image_surface_get_height(actualImage) == cairo_image_surface_get_height(baselineImage))
+                && (imageHasAlpha(actualImage) == imageHasAlpha(baselineImage))) {
+                diffImage = createDifferenceImage(actualImage, baselineImage, difference); // difference is passed by reference
+                if (difference <= tolerance)
+                    difference = 0;
+                else {
+                    difference = roundf(difference * 100.0) / 100.0;
+                    difference = max<float>(difference, 0.01); // round to 2 decimal places
+                }
+            } else
+                fputs("error, test and reference image have different properties.\n", stderr);
+                
+            if (difference > 0.0) {
+                if (diffImage) {
+                    RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
+                    cairo_surface_write_to_png_stream(diffImage, (cairo_write_func_t)writeToData, imageData.get());
+                    printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
+                    fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
+                    cairo_surface_destroy(diffImage);
+                    diffImage = 0;
+                }
+                
+                fprintf(stdout, "diff: %01.2f%% failed\n", difference);
+            } else
+                fprintf(stdout, "diff: %01.2f%% passed\n", difference);
+            
+            cairo_surface_destroy(actualImage);
+            cairo_surface_destroy(baselineImage);
+            actualImage = 0;
+            baselineImage = 0;
+        }
+
+        fflush(stdout);
+    }
+
+    return 0;
+}