From ecc99c003b4aca7d7d2f268f927558db4cbddfe1 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Wed, 20 Jan 2010 13:56:07 -0800
Subject: [PATCH] part of fix for [2363362] [Sapphire] Corrupted raw picture
 displayed during snapshot

make sure to fallback properly to software when copybit operation fails.
with this change, the preview image will at least be displayed in b&w
(since GL doesn't support the yuv format). This would also fix
2363506, but that one is now handled more cleanly.
---
 libs/surfaceflinger/LayerBuffer.cpp | 28 +++++++++++++++++-----------
 libs/surfaceflinger/LayerBuffer.h   |  1 +
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/libs/surfaceflinger/LayerBuffer.cpp b/libs/surfaceflinger/LayerBuffer.cpp
index dbcb367a9..1dbfe3489 100644
--- a/libs/surfaceflinger/LayerBuffer.cpp
+++ b/libs/surfaceflinger/LayerBuffer.cpp
@@ -444,10 +444,6 @@ void LayerBuffer::BufferSource::onDraw(const Region& clip) const
     NativeBuffer src(ourBuffer->getBuffer());
     const Rect transformedBounds(mLayer.getTransformedBounds());
 
-    if (UNLIKELY(mTexture.name == -1LU)) {
-        mTexture.name = mLayer.createTexture();
-    }
-
 #if defined(EGL_ANDROID_image_native_buffer)
     if (mLayer.mFlags & DisplayHardware::DIRECT_TEXTURE) {
         copybit_device_t* copybit = mLayer.mBlitEngine;
@@ -463,7 +459,9 @@ void LayerBuffer::BufferSource::onDraw(const Region& clip) const
                 copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_ENABLE);
                 err = copybit->stretch(copybit, &dst.img, &src.img,
                         &dst.crop, &src.crop, &clip);
-
+                if (err != NO_ERROR) {
+                    clearTempBufferImage();
+                }
             }
         } else {
             err = INVALID_OPERATION;
@@ -485,6 +483,9 @@ void LayerBuffer::BufferSource::onDraw(const Region& clip) const
         t.format = src.img.format;
         t.data = (GGLubyte*)src.img.base;
         const Region dirty(Rect(t.width, t.height));
+        if (UNLIKELY(mTexture.name == -1LU)) {
+            mTexture.name = mLayer.createTexture();
+        }
         mLayer.loadTexture(&mTexture, dirty, t);
     }
 
@@ -506,12 +507,7 @@ status_t LayerBuffer::BufferSource::initTempBuffer() const
         // we have an EGLImage, make sure the needed size didn't change
         if (w!=mTexture.width || h!= mTexture.height) {
             // delete the EGLImage and texture
-            EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
-            glDeleteTextures(1, &mTexture.name);
-            eglDestroyImageKHR(dpy, mTexture.image);
-            Texture defaultTexture;
-            mTexture = defaultTexture;
-            mTempGraphicBuffer.clear();
+            clearTempBufferImage();
         } else {
             // we're good, we have an EGLImageKHR and it's (still) the
             // right size
@@ -558,6 +554,16 @@ status_t LayerBuffer::BufferSource::initTempBuffer() const
     return err;
 }
 
+void LayerBuffer::BufferSource::clearTempBufferImage() const
+{
+    EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
+    glDeleteTextures(1, &mTexture.name);
+    eglDestroyImageKHR(dpy, mTexture.image);
+    Texture defaultTexture;
+    mTexture = defaultTexture;
+    mTempGraphicBuffer.clear();
+}
+
 // ---------------------------------------------------------------------------
 
 LayerBuffer::OverlaySource::OverlaySource(LayerBuffer& layer,
diff --git a/libs/surfaceflinger/LayerBuffer.h b/libs/surfaceflinger/LayerBuffer.h
index 90f83c4c1..1b3143555 100644
--- a/libs/surfaceflinger/LayerBuffer.h
+++ b/libs/surfaceflinger/LayerBuffer.h
@@ -135,6 +135,7 @@ private:
         virtual void destroy() { }
     private:
         status_t initTempBuffer() const;
+        void clearTempBufferImage() const;
         mutable Mutex                   mBufferSourceLock;
         sp<Buffer>                      mBuffer;
         status_t                        mStatus;