Varying-based AA rect drawing

Instead of calculating opacity from relative position in the shader, use a
shader varying to do this computation for us.

bug:5045101

Also adds a test to HwAccelerationTest to show incorrect antialiasing in
scaled drawAARect / boundarySize calculation.

Change-Id: Icdc41acb01dc10ce354834f8389a5aed2f439162

1 files changed, 5 insertions, 0 deletions

diff --git a/libs/hwui/Program.h b/libs/hwui/Program.h
index 1818f82..a3bfaa4 100644
--- a/libs/hwui/Program.h
+++ b/libs/hwui/Program.h
@@ -81,6 +81,8 @@ namespace uirenderer {
 
 #define PROGRAM_IS_SIMPLE_GRADIENT 41
 
+#define PROGRAM_IS_AA_RECT_SHIFT 42
+
 ///////////////////////////////////////////////////////////////////////////////
 // Types
 ///////////////////////////////////////////////////////////////////////////////
@@ -128,6 +130,7 @@ struct ProgramDescription {
     bool isBitmapNpot;
 
     bool isAA;
+    bool isAARect;
 
     bool hasGradient;
     Gradient gradientType;
@@ -165,6 +168,7 @@ struct ProgramDescription {
         hasTextureTransform = false;
 
         isAA = false;
+        isAARect = false;
 
         modulate = false;
 
@@ -260,6 +264,7 @@ struct ProgramDescription {
         if (hasTextureTransform) key |= programid(0x1) << PROGRAM_HAS_TEXTURE_TRANSFORM_SHIFT;
         if (hasGammaCorrection) key |= programid(0x1) << PROGRAM_HAS_GAMMA_CORRECTION;
         if (isSimpleGradient) key |= programid(0x1) << PROGRAM_IS_SIMPLE_GRADIENT;
+        if (isAARect) key |= programid(0x1) << PROGRAM_IS_AA_RECT_SHIFT;
         return key;
     }