Add a render buffer cache to reuse stencil buffers

Bug #7146141

This new cache is used in a similar way to LayerCache. It helps
reuse already allocated stencil buffers and thus avoid churning
memory on every frame.

Change-Id: I19551d72da52c40039e65904563600e492c8b193

1 files changed, 1 insertions, 4 deletions

diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 62f268dab291..2431e54cde8f 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -1273,11 +1273,8 @@ void OpenGLRenderer::attachStencilBufferToLayer(Layer* layer) {
         // attach the new render buffer then turn tiling back on
         endTiling();
 
-        RenderBuffer* buffer = new RenderBuffer(
+        RenderBuffer* buffer = mCaches.renderBufferCache.get(
                 Stencil::getSmallestStencilFormat(), layer->getWidth(), layer->getHeight());
-        buffer->bind();
-        buffer->allocate();
-
         layer->setStencilRenderBuffer(buffer);
 
         startTiling(layer->clipRect, layer->layer.getHeight());