cc: Add point-based UV coordinate on TextureLayer

Previously, the uv coordinates was using gfx::RectF as a struct.
This was limitating because it could not handle negative width
and heights. Soring them as 2 gfx::PointF for the Top-Left and
Bottom-Right points aleviate that restriction.
The current implementation of the phone UI rely on this feature.

BUG=168927

Review URL: https://chromiumcodereview.appspot.com/11783094

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177288 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 4 deletions

diff --git a/cc/gl_renderer.cc b/cc/gl_renderer.cc
index 9bb2fde..219d60f 100644
--- a/cc/gl_renderer.cc
+++ b/cc/gl_renderer.cc
@@ -1087,8 +1087,9 @@ void GLRenderer::enqueueTextureQuad(const DrawingFrame& frame, const TextureDraw
     }
 
     // Generate the uv-transform
-    const gfx::RectF& uvRect = quad->uv_rect;
-    Float4 uv = {uvRect.x(), uvRect.y(), uvRect.width(), uvRect.height()};
+    const gfx::PointF& uv0 = quad->uv_top_left;
+    const gfx::PointF& uv1 = quad->uv_bottom_right;
+    Float4 uv = {uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()};
     m_drawCache.uv_xform_data.push_back(uv);
 
     // Generate the vertex opacity
@@ -1117,8 +1118,9 @@ void GLRenderer::drawTextureQuad(const DrawingFrame& frame, const TextureDrawQua
         binding.set(textureProgram(), context());
     setUseProgram(binding.programId);
     GLC(context(), context()->uniform1i(binding.samplerLocation, 0));
-    const gfx::RectF& uvRect = quad->uv_rect;
-    GLC(context(), context()->uniform4f(binding.texTransformLocation, uvRect.x(), uvRect.y(), uvRect.width(), uvRect.height()));
+    const gfx::PointF& uv0 = quad->uv_top_left;
+    const gfx::PointF& uv1 = quad->uv_bottom_right;
+    GLC(context(), context()->uniform4f(binding.texTransformLocation, uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()));
 
     GLC(context(), context()->uniform1fv(binding.vertexOpacityLocation, 4, quad->vertex_opacity));