Snap for 4754571 from 068717010e0481268c3abc23068cd7ec436f1253 to pi-release

Change-Id: I93e3eafe0a8e029681764c67d1212df1f52d52c7

1 files changed, 11 insertions, 2 deletions

diff --git a/system/gralloc/gralloc.cpp b/system/gralloc/gralloc.cpp
index 37481487..cabc27b1 100644
--- a/system/gralloc/gralloc.cpp
+++ b/system/gralloc/gralloc.cpp
@@ -715,10 +715,19 @@ static int gralloc_alloc(alloc_device_t* dev,
 
     if (needHostCb) {
         if (hostCon && rcEnc) {
+            GLenum allocFormat = glFormat;
+            // The handling of RGBX_8888 is very subtle. Most of the time
+            // we want it to be treated as RGBA_8888, with the exception
+            // that alpha is always ignored and treated as 1. The solution
+            // is to create 3 channel RGB texture instead and host GL will
+            // handle the Alpha channel.
+            if (HAL_PIXEL_FORMAT_RGBX_8888 == format) {
+                allocFormat = GL_RGB;
+            }
             if (s_grdma) {
-                cb->hostHandle = rcEnc->rcCreateColorBufferDMA(rcEnc, w, h, glFormat, cb->emuFrameworkFormat);
+                cb->hostHandle = rcEnc->rcCreateColorBufferDMA(rcEnc, w, h, allocFormat, cb->emuFrameworkFormat);
             } else {
-                cb->hostHandle = rcEnc->rcCreateColorBuffer(rcEnc, w, h, glFormat);
+                cb->hostHandle = rcEnc->rcCreateColorBuffer(rcEnc, w, h, allocFormat);
             }
             D("Created host ColorBuffer 0x%x\n", cb->hostHandle);
         }