cc: Make UV coords in TileDrawQuad a full RectF

Previously, TileDrawQuad assumed that texels were 1:1 with geometry, so it only
needed an offset into the texture to calculate the UVs.  For impl-side painting
where multiple contents scales might be in play, a given texture rect isn't going
to be 1:1 with geometry rects and also will not be necessarily integer aligned.

Also, some things (like edge antialiasing) still need to know the texture size
so that it can do half-texel offsets, so this new texture rect needs to stay in
"texel space" rather than 0-1 "uv space".

R=danakj@chromium.org
BUG=155209


Review URL: https://chromiumcodereview.appspot.com/11348109

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168723 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 1 deletions

diff --git a/cc/tiled_layer_impl.cc b/cc/tiled_layer_impl.cc
index 09b4b9f..3773542 100644
--- a/cc/tiled_layer_impl.cc
+++ b/cc/tiled_layer_impl.cc
@@ -172,6 +172,8 @@ void TiledLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuad
             // offset the same amount.
             gfx::Vector2d displayOffset = tileRect.origin() - displayRect.origin();
             gfx::Vector2d textureOffset = m_tiler->textureOffset(i, j) + displayOffset;
+            gfx::RectF texCoordRect = gfx::RectF(tileRect.size()) + textureOffset;
+
             float tileWidth = static_cast<float>(m_tiler->tileSize().width());
             float tileHeight = static_cast<float>(m_tiler->tileSize().height());
             gfx::Size textureSize(tileWidth, tileHeight);
@@ -186,7 +188,7 @@ void TiledLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuad
             bool rightEdgeAA = i == m_tiler->numTilesX() - 1 && useAA;
             bool bottomEdgeAA = j == m_tiler->numTilesY() - 1 && useAA;
 
-            quadSink.append(TileDrawQuad::create(sharedQuadState, tileRect, tileOpaqueRect, tile->resourceId(), textureOffset, textureSize, tile->contentsSwizzled(), leftEdgeAA, topEdgeAA, rightEdgeAA, bottomEdgeAA).PassAs<DrawQuad>(), appendQuadsData);
+            quadSink.append(TileDrawQuad::create(sharedQuadState, tileRect, tileOpaqueRect, tile->resourceId(), texCoordRect, textureSize, tile->contentsSwizzled(), leftEdgeAA, topEdgeAA, rightEdgeAA, bottomEdgeAA).PassAs<DrawQuad>(), appendQuadsData);
         }
     }
 }