Require minimum 4 bit stencil for layers.
bug:19270131
Change-Id: I81367179d268e7c1642259c456c1f3d0018f6c0d
diff --git a/libs/hwui/renderstate/Stencil.cpp b/libs/hwui/renderstate/Stencil.cpp
index cedb233..92a057d 100644
--- a/libs/hwui/renderstate/Stencil.cpp
+++ b/libs/hwui/renderstate/Stencil.cpp
@@ -42,12 +42,17 @@
return STENCIL_BUFFER_SIZE;
}
-GLenum Stencil::getSmallestStencilFormat() {
+/**
+ * This method will return either GL_STENCIL_INDEX4_OES if supported,
+ * GL_STENCIL_INDEX8 if not.
+ *
+ * Layers can't use a single bit stencil because multi-rect ClipArea needs a high enough
+ * stencil resolution to represent the summation of multiple intersecting rect geometries.
+ */
+GLenum Stencil::getLayerStencilFormat() {
#if !DEBUG_STENCIL
const Extensions& extensions = Caches::getInstance().extensions();
- if (extensions.has1BitStencil()) {
- return GL_STENCIL_INDEX1_OES;
- } else if (extensions.has4BitStencil()) {
+ if (extensions.has4BitStencil()) {
return GL_STENCIL_INDEX4_OES;
}
#endif