From d555684cb36dfb959694db76962e570184f98838 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Thu, 19 Sep 2013 17:08:37 -0700
Subject: [PATCH] reinstate black-screenshot debugging code

turned off by default.

Bug: 10809349
Change-Id: I3e6b8c7860e6b0e122b8f07de4020967cd1f005c
---
 .../RenderEngine/RenderEngine.cpp             |  4 ++++
 .../RenderEngine/RenderEngine.h               |  3 +--
 services/surfaceflinger/SurfaceFlinger.cpp    | 20 +++++++++++++------
 services/surfaceflinger/SurfaceFlinger.h      |  2 +-
 4 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.cpp b/services/surfaceflinger/RenderEngine/RenderEngine.cpp
index c36fcde3f..ba82cadb0 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.cpp
@@ -201,6 +201,10 @@ void RenderEngine::deleteTextures(size_t count, uint32_t const* names) {
     glDeleteTextures(count, names);
 }
 
+void RenderEngine::readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels) {
+    glReadPixels(l, b, w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+}
+
 void RenderEngine::dump(String8& result) {
     const GLExtensions& extensions(GLExtensions::getInstance());
     result.appendFormat("GLES: %s, %s, %s\n",
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index 5f331d4a4..3c7f9ab09 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -70,6 +70,7 @@ public:
     void disableScissor();
     void genTextures(size_t count, uint32_t* names);
     void deleteTextures(size_t count, uint32_t const* names);
+    void readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels);
 
     class BindImageAsFramebuffer {
         RenderEngine& mEngine;
@@ -106,8 +107,6 @@ public:
     virtual size_t getMaxTextureSize() const = 0;
     virtual size_t getMaxViewportDims() const = 0;
 
-
-
     EGLContext getEGLContext() const;
 };
 
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 02aef2b27..879c91187 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2832,6 +2832,15 @@ status_t SurfaceFlinger::captureScreenImplLocked(
                         // dependent on the context's EGLConfig.
                         renderScreenImplLocked(hw, reqWidth, reqHeight,
                                 minLayerZ, maxLayerZ, true);
+
+                        if (DEBUG_SCREENSHOTS) {
+                            uint32_t* pixels = new uint32_t[reqWidth*reqHeight];
+                            getRenderEngine().readPixels(0, 0, reqWidth, reqHeight, pixels);
+                            checkScreenshot(reqWidth, reqHeight, reqWidth, pixels,
+                                    hw, minLayerZ, maxLayerZ);
+                            delete [] pixels;
+                        }
+
                     } else {
                         ALOGE("got GL_FRAMEBUFFER_COMPLETE_OES error while taking screenshot");
                         result = INVALID_OPERATION;
@@ -2852,13 +2861,12 @@ status_t SurfaceFlinger::captureScreenImplLocked(
     return result;
 }
 
-void SurfaceFlinger::checkScreenshot(const sp<GraphicBuffer>& buf, void const* vaddr,
-        const sp<const DisplayDevice>& hw,
-        uint32_t minLayerZ, uint32_t maxLayerZ) {
+void SurfaceFlinger::checkScreenshot(size_t w, size_t s, size_t h, void const* vaddr,
+        const sp<const DisplayDevice>& hw, uint32_t minLayerZ, uint32_t maxLayerZ) {
     if (DEBUG_SCREENSHOTS) {
-        for (ssize_t y=0 ; y<buf->height ; y++) {
-            uint32_t const * p = (uint32_t const *)vaddr + y*buf->stride;
-            for (ssize_t x=0 ; x<buf->width ; x++) {
+        for (size_t y=0 ; y<h ; y++) {
+            uint32_t const * p = (uint32_t const *)vaddr + y*s;
+            for (size_t x=0 ; x<w ; x++) {
                 if (p[x] != 0xFF000000) return;
             }
         }
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 0cfc6004e..989e439ba 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -388,7 +388,7 @@ private:
     void dumpAllLocked(const Vector<String16>& args, size_t& index, String8& result) const;
     bool startDdmConnection();
     static void appendSfConfigString(String8& result);
-    void checkScreenshot(const sp<GraphicBuffer>& buf, void const* vaddr,
+    void checkScreenshot(size_t w, size_t s, size_t h, void const* vaddr,
             const sp<const DisplayDevice>& hw,
             uint32_t minLayerZ, uint32_t maxLayerZ);