[Qt] Shadow blur for rectangle fill

[Ariya Hidayat]

Implement blur support for shadow of rectangles.

Shadow pixel tests need to be updated, too.

[Ariya Hidayat]

Created attachment 64463 [details]
Patch

[Ariya Hidayat]

Created attachment 64469 [details]
Patch

[Kenneth Rohde Christiansen]

Comment on attachment 64469 [details]
Patch

Looks good to me, some minor nits below.

WebCore/platform/graphics/qt/ContextShadow.cpp:70
 +  #define BLUR_SUM_SHIFT 14
Why not use a static const?

WebCore/platform/graphics/qt/ContextShadow.cpp:72
 +  // Note: image must be RGB32 format
You could add an assert for that, I guess

WebCore/platform/graphics/qt/ContextShadow.cpp:88
 +  
why this extra newline?

WebCore/platform/graphics/qt/ContextShadow.cpp:91
 +          int left, right, pixelCount, prev, next;
We normally do not add most variable declarations on the same line.

WebCore/platform/graphics/qt/ContextShadow.cpp:128
 +                          ((prev > 0) ? *prevPtr : firstAlpha);
why not just keep on one line :-) I guess it is shorter than the above for-one.

WebCore/platform/graphics/qt/ContextShadow.cpp:154
 +          // Step 3: blur green channel and store the result in the alpha channel
Add a dot at the end of the comment.

WebCore/platform/graphics/qt/ContextShadow.cpp:190
 +      // "colorize" with the right shadow color
here as well

WebCore/platform/graphics/qt/ContextShadow.cpp:220
 +      }
Here we shouldnt use braces according to the coding style guide

[Ariya Hidayat]

Manually committed r65425: http://trac.webkit.org/changeset/65425

[Ariya Hidayat]

Comment on attachment 64469 [details]
Patch

Clearing the review flag.