[skia] Track a simple opaque area when painting via PlatformContextSkia and save in LayerTextureUpdater
https://bugs.webkit.org/show_bug.cgi?id=74352

Patch by Dana Jansens <danakj@chromium.org> on 2012-01-12
Reviewed by Stephen White.

Source/WebCore:

New unit tests in PlatformContextSkiaTest.cpp

* WebCore.gypi:
* platform/graphics/skia/GraphicsContextSkia.cpp:
(WebCore::GraphicsContext::clearRect):
(WebCore::GraphicsContext::drawConvexPolygon):
(WebCore::GraphicsContext::drawEllipse):
(WebCore::drawOuterPath):
(WebCore::drawInnerPath):
(WebCore::GraphicsContext::drawFocusRing):
(WebCore::GraphicsContext::drawLine):
(WebCore::GraphicsContext::drawLineForTextChecking):
(WebCore::GraphicsContext::drawLineForText):
(WebCore::GraphicsContext::fillPath):
(WebCore::GraphicsContext::fillRect):
(WebCore::GraphicsContext::fillRoundedRect):
(WebCore::GraphicsContext::strokeArc):
(WebCore::GraphicsContext::strokePath):
(WebCore::GraphicsContext::strokeRect):
* platform/graphics/skia/ImageSkia.cpp:
(WebCore::paintSkBitmap):
* platform/graphics/skia/OpaqueRegionSkia.cpp: Added.
(WebCore::OpaqueRegionSkia::OpaqueRegionSkia):
(WebCore::OpaqueRegionSkia::~OpaqueRegionSkia):
(WebCore::OpaqueRegionSkia::asRect):
(WebCore::xfermodeIsOpaque):
(WebCore::xfermodePreservesOpaque):
(WebCore::paintIsOpaque):
(WebCore::OpaqueRegionSkia::didDrawRect):
(WebCore::OpaqueRegionSkia::didDrawPath):
(WebCore::OpaqueRegionSkia::didDrawPoints):
(WebCore::OpaqueRegionSkia::didDrawBounded):
(WebCore::OpaqueRegionSkia::didDraw):
(WebCore::OpaqueRegionSkia::didDrawUnbounded):
(WebCore::OpaqueRegionSkia::markRectAsOpaque):
(WebCore::OpaqueRegionSkia::markRectAsNonOpaque):
* platform/graphics/skia/OpaqueRegionSkia.h: Added.
* platform/graphics/skia/PlatformContextSkia.cpp:
(WebCore::PlatformContextSkia::PlatformContextSkia):
(WebCore::PlatformContextSkia::clippedToImage):
(WebCore::PlatformContextSkia::drawRect):
(WebCore::PlatformContextSkia::paintSkPaint):
(WebCore::PlatformContextSkia::didDrawRect):
(WebCore::PlatformContextSkia::didDrawPath):
(WebCore::PlatformContextSkia::didDrawPoints):
(WebCore::PlatformContextSkia::didDrawBounded):
* platform/graphics/skia/PlatformContextSkia.h:
(WebCore::PlatformContextSkia::setTrackOpaqueRegion):
(WebCore::PlatformContextSkia::opaqueRegion):

Source/WebKit/chromium:

* WebKit.gypi:
* tests/PlatformContextSkiaTest.cpp: Added.
(WebCore::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@104861 268f45cc-cd09-0410-ab3c-d52691b4dbfc