diff -r 000000000000 -r 4f2f89ce4247 WebKitTools/DumpRenderTree/PixelDumpSupport.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/DumpRenderTree/PixelDumpSupport.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2009 Apple, Inc. 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS 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.
+ */
+
+#include "config.h"
+#include "DumpRenderTree.h"
+#include "LayoutTestController.h"
+#include "PixelDumpSupport.h"
+#include <cstdio>
+#include <wtf/Assertions.h>
+#include <wtf/RefPtr.h>
+
+#if PLATFORM(CG)
+#include "PixelDumpSupportCG.h"
+#elif PLATFORM(CAIRO)
+#include "PixelDumpSupportCairo.h"
+#endif
+
+void dumpWebViewAsPixelsAndCompareWithExpected(const std::string& expectedHash)
+{
+    RefPtr<BitmapContext> context;
+#if PLATFORM(MAC)
+    if (gLayoutTestController->isPrinting())
+        context = createPagedBitmapContext();
+    else
+#endif
+        context = createBitmapContextFromWebView(gLayoutTestController->testOnscreen(), gLayoutTestController->testRepaint(), gLayoutTestController->testRepaintSweepHorizontally(), gLayoutTestController->dumpSelectionRect());
+    ASSERT(context);
+    
+    // Compute the hash of the bitmap context pixels
+    char actualHash[33];
+    computeMD5HashStringForBitmapContext(context.get(), actualHash);
+    printf("\nActualHash: %s\n", actualHash);
+    
+    // Check the computed hash against the expected one and dump image on mismatch
+    bool dumpImage = true;
+    if (expectedHash.length() > 0) {
+        ASSERT(expectedHash.length() == 32);
+        
+        printf("\nExpectedHash: %s\n", expectedHash.c_str());
+        
+        if (expectedHash == actualHash)     // FIXME: do case insensitive compare
+            dumpImage = false;
+    }
+    
+    if (dumpImage)
+      dumpBitmap(context.get());
+}
+
+void printPNG(const unsigned char* data, const size_t dataLength)
+{
+    printf("Content-Type: %s\n", "image/png");
+    printf("Content-Length: %lu\n", static_cast<unsigned long>(dataLength));
+
+    const size_t bytesToWriteInOneChunk = 1 << 15;
+    size_t dataRemainingToWrite = dataLength;
+    while (dataRemainingToWrite) {
+        size_t bytesToWriteInThisChunk = std::min(dataRemainingToWrite, bytesToWriteInOneChunk);
+        size_t bytesWritten = fwrite(data, 1, bytesToWriteInThisChunk, stdout);
+        if (bytesWritten != bytesToWriteInThisChunk)
+            break;
+        dataRemainingToWrite -= bytesWritten;
+        data += bytesWritten;
+    }
+}