Add new property to debug non-rectangular clip operations

This change adds a new property called "debug.hwui.show_stencil_clip"
that accepts the following values:

- "highlight", colorizes in green any drawing command that's tested
  against a non-rectangular clip region
- "region", shows the non-rectangular clip region in blue every time
  it is used
- "hide", default value, nothing is shown

Change-Id: I83c8602310edc4aaeb8b905371cdd185b17d32b5

1 files changed, 7 insertions, 1 deletions

diff --git a/libs/hwui/ProgramCache.cpp b/libs/hwui/ProgramCache.cpp
index 74d598d5311e..0f014cbfa96a 100644
--- a/libs/hwui/ProgramCache.cpp
+++ b/libs/hwui/ProgramCache.cpp
@@ -351,6 +351,8 @@ const char* gFS_Main_ApplyColorOp[4] = {
         // PorterDuff
         "    fragColor = blendColors(colorBlend, fragColor);\n"
 };
+const char* gFS_Main_DebugHighlight =
+        "    gl_FragColor.rgb = vec3(0.0, gl_FragColor.a, 0.0);\n";
 const char* gFS_Footer =
         "}\n\n";
 
@@ -604,7 +606,8 @@ String8 ProgramCache::generateFragmentShader(const ProgramDescription& descripti
 
     // Optimization for common cases
     if (!description.isAA && !blendFramebuffer && !description.hasColors &&
-            description.colorOp == ProgramDescription::kColorNone && !description.isPoint) {
+            description.colorOp == ProgramDescription::kColorNone &&
+            !description.isPoint && !description.hasDebugHighlight) {
         bool fast = false;
 
         const bool noShader = !description.hasGradient && !description.hasBitmap;
@@ -752,6 +755,9 @@ String8 ProgramCache::generateFragmentShader(const ProgramDescription& descripti
         if (description.hasColors) {
             shader.append(gFS_Main_FragColor_HasColors);
         }
+        if (description.hasDebugHighlight) {
+            shader.append(gFS_Main_DebugHighlight);
+        }
     }
     // End the shader
     shader.append(gFS_Footer);