Imported WebKit commit cf4f8fc6f19b0629f51860cb2d4b25e139d07e00 (http://svn.webkit.org/repository/webkit/trunk@131592)

New snapshot that includes the build fixes for Mac OS X 10.6 and earlier as well
as the previously cherry-picked changes

1 files changed, 7 insertions, 6 deletions

diff --git a/Source/WebCore/platform/graphics/filters/FETurbulence.cpp b/Source/WebCore/platform/graphics/filters/FETurbulence.cpp
index 03df56b30..17688746f 100644
--- a/Source/WebCore/platform/graphics/filters/FETurbulence.cpp
+++ b/Source/WebCore/platform/graphics/filters/FETurbulence.cpp
@@ -376,19 +376,20 @@ void FETurbulence::platformApplySoftware()
         // Fill the parameter array
         int i = parallelJobs.numberOfJobs();
         if (i > 1) {
+            // Split the job into "stepY"-sized jobs but there a few jobs that need to be slightly larger since
+            // stepY * jobs < total size. These extras are handled by the remainder "jobsWithExtra".
+            const int stepY = absolutePaintRect().height() / i;
+            const int jobsWithExtra = absolutePaintRect().height() % i;
+
             int startY = 0;
-            int stepY = absolutePaintRect().height() / i;
             for (; i > 0; --i) {
                 FillRegionParameters& params = parallelJobs.parameter(i-1);
                 params.filter = this;
                 params.pixelArray = pixelArray;
                 params.paintingData = &paintingData;
                 params.startY = startY;
-                if (i != 1) {
-                    params.endY = startY + stepY;
-                    startY = startY + stepY;
-                } else
-                    params.endY = absolutePaintRect().height();
+                startY += i < jobsWithExtra ? stepY + 1 : stepY;
+                params.endY = startY;
             }
 
             // Execute parallel jobs