[Cairo][WTR] Implement the painting of repaint rectangles.

https://bugs.webkit.org/show_bug.cgi?id=99839

Reviewed by Martin Robinson.

Implement the required code to paint the gray overlay with
transparent regions for the repaint rectangles, as other ports
already do and as is already done in most WK1 ports.

* WebKitTestRunner/cairo/TestInvocationCairo.cpp:
(WTR::paintRepaintRectOverlay):
(WTR::TestInvocation::dumpPixelsAndCompareWithExpected):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@131941 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Author: [email protected]

Tools/ChangeLog

@@ -1,3 +1,18 @@
+2012-10-19  Raphael Kubo da Costa  <[email protected]>
+
+        [Cairo][WTR] Implement the painting of repaint rectangles.
+        https://bugs.webkit.org/show_bug.cgi?id=99839
+
+        Reviewed by Martin Robinson.
+
+        Implement the required code to paint the gray overlay with
+        transparent regions for the repaint rectangles, as other ports
+        already do and as is already done in most WK1 ports.
+
+        * WebKitTestRunner/cairo/TestInvocationCairo.cpp:
+        (WTR::paintRepaintRectOverlay):
+        (WTR::TestInvocation::dumpPixelsAndCompareWithExpected):
+
 2012-09-08  Alpha Lam  <[email protected]>
 
         [chromium] Implement deferred image decoding

Tools/WebKitTestRunner/cairo/TestInvocationCairo.cpp

@@ -2,6 +2,7 @@
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *           (C) 2011 Brent Fulgham <[email protected]>. All rights reserved.
  *           (C) 2010, 2011 Igalia S.L
+ *           (C) 2012 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -77,10 +78,39 @@ static void dumpBitmap(cairo_surface_t* surface, const char* checksum)
     printPNG(data, dataLength, checksum);
 }
 
-void TestInvocation::dumpPixelsAndCompareWithExpected(WKImageRef wkImage, WKArrayRef /*repaintRects*/)
+static void paintRepaintRectOverlay(cairo_surface_t* surface, WKArrayRef repaintRects)
+{
+    cairo_t* context = cairo_create(surface);
+
+    cairo_push_group(context);
+
+    // Paint the gray mask over the original image.
+    cairo_set_source_rgba(context, 0, 0, 0, 0.66);
+    cairo_paint(context);
+
+    // Paint transparent rectangles over the mask to show the repainted regions.
+    cairo_set_source_rgba(context, 0, 0, 0, 0);
+    cairo_set_operator(context, CAIRO_OPERATOR_SOURCE);
+    size_t count = WKArrayGetSize(repaintRects);
+    for (size_t i = 0; i < count; ++i) {
+        WKRect rect = WKRectGetValue(static_cast<WKRectRef>(WKArrayGetItemAtIndex(repaintRects, i)));
+        cairo_rectangle(context, rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
+        cairo_fill(context);
+    }
+
+    cairo_pop_group_to_source(context);
+    cairo_paint(context);
+
+    cairo_destroy(context);
+}
+
+void TestInvocation::dumpPixelsAndCompareWithExpected(WKImageRef wkImage, WKArrayRef repaintRects)
 {
     cairo_surface_t* surface = WKImageCreateCairoSurface(wkImage);
 
+    if (repaintRects)
+        paintRepaintRectOverlay(surface, repaintRects);
+
     char actualHash[33];
     computeMD5HashStringForCairoSurface(surface, actualHash);
     if (!compareActualHashToExpectedAndDumpResults(actualHash))