Reviewed by Dimitri Glazkov.

        Canvas2D does not support images larger than system's GPU max texture size
        https://bugs.webkit.org/show_bug.cgi?id=43864

        A new class "TilingData" has been created that provides logic for
        splitting a large image into a series of smaller tiles.

        GLES2Texture and CLES2Canvas are modified to use the TilingData to
        split images on texture upload and render one logical image as many smaller
        images.

        TilingData is tested via unit tests in WebKit/chromium/tests/TilingDataTest.cpp

        * WebCore.gypi:
        * platform/graphics/chromium/GLES2Canvas.cpp:
        (WebCore::GLES2Canvas::drawTexturedRect):
        (WebCore::GLES2Canvas::drawTexturedRectTile):
        * platform/graphics/chromium/GLES2Canvas.h:
        * platform/graphics/chromium/GLES2Texture.cpp:
        (WebCore::GLES2Texture::GLES2Texture):
        (WebCore::GLES2Texture::~GLES2Texture):
        (WebCore::GLES2Texture::create):
        (WebCore::copySubRect):
        (WebCore::GLES2Texture::load):
        (WebCore::GLES2Texture::bindTile):
        * platform/graphics/chromium/GLES2Texture.h:
        (WebCore::GLES2Texture::tiles):
        * platform/graphics/chromium/TilingData.cpp: Added.
        (WebCore::computeNumTiles):
        (WebCore::TilingData::TilingData):
        (WebCore::TilingData::tileXIndexFromSrcCoord):
        (WebCore::TilingData::tileYIndexFromSrcCoord):
        (WebCore::TilingData::tileBounds):
        (WebCore::TilingData::tileBoundsWithBorder):
        (WebCore::TilingData::tileBoundsNormalized):
        (WebCore::TilingData::tilePositionX):
        (WebCore::TilingData::tilePositionY):
        (WebCore::TilingData::tileSizeX):
        (WebCore::TilingData::tileSizeY):
        (WebCore::TilingData::overlappedTileIndices):
        (WebCore::TilingData::intersectDrawQuad):
        * platform/graphics/chromium/TilingData.h: Added.
        (WebCore::TilingData::maxTextureSize):
        (WebCore::TilingData::totalSizeX):
        (WebCore::TilingData::totalSizeY):
        (WebCore::TilingData::numTiles):
        (WebCore::TilingData::numTilesX):
        (WebCore::TilingData::numTilesY):
        (WebCore::TilingData::tileIndex):
        (WebCore::TilingData::tileXIndex):
        (WebCore::TilingData::tileYIndex):
        (WebCore::TilingData::TilingData):
        (WebCore::TilingData::assertTile):
        * platform/graphics/skia/ImageSkia.cpp:
        (WebCore::BitmapImage::draw):
        * platform/graphics/skia/PlatformContextSkia.cpp:
        (WebCore::PlatformContextSkia::uploadSoftwareToHardware):
2010-08-16  Vincent Scheib  <scheib@chromium.org>

        Reviewed by Dimitri Glazkov.

        Canvas2D does not support images larger than system's GPU max texture size
        https://bugs.webkit.org/show_bug.cgi?id=43864

        Unit tests for TilingData class.

        * WebKit.gyp:
        * tests/TilingDataTest.cpp: Added.
        (WebCore::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65455 268f45cc-cd09-0410-ab3c-d52691b4dbfc