commit 9a773c71668a6f2d3be40e08e6cf4207e8ee1daa
author Scott Randolph <randolphs@google.com> Wed Feb 15 16:25:48 2017 -0800
committer Scott Randolph <randolphs@google.com> Thu Feb 16 12:05:56 2017 -0800
tree 2c1a875f506078a4a038b5de05f36bf7e2e2725a
parent 423e2ab23ad74cee1ab01bde0eacece7c0e40b0b

Buffer transfer and locking workarounds for EVS

These changes get EVS working for 3 frames with validated buffer contents
before HIDL reports a error on the 4th frame when running on Marlin.  More
investigation is required to resolve the HIDL issue.

Test:  Build and run againsgt evs_test
Change-Id: I5096e74aa897e690900620b77a47f79646b0f040

evs/1.0/default/EvsCamera.cpp

diff --git a/evs/1.0/default/EvsCamera.cpp b/evs/1.0/default/EvsCamera.cpp
index a539b23..df7e844 100644
--- a/evs/1.0/default/EvsCamera.cpp
+++ b/evs/1.0/default/EvsCamera.cpp
@@ -69,7 +69,8 @@
     mHeight = (mDescription.defaultVerResolution) ? mDescription.defaultVerResolution : 480;
 
     mFormat = HAL_PIXEL_FORMAT_RGBA_8888;
-    mUsage  = GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_HW_CAMERA_WRITE;
+    mUsage  = GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_HW_CAMERA_WRITE |
+              GRALLOC_USAGE_SW_READ_RARELY | GRALLOC_USAGE_SW_WRITE_RARELY;
 }
 
 
@@ -440,7 +441,7 @@
 }
 
 
-void EvsCamera::fillTestFrame(BufferDesc buff) {
+void EvsCamera::fillTestFrame(const BufferDesc& buff) {
     // Lock our output buffer for writing
     uint32_t *pixels = nullptr;
     GraphicBufferMapper &mapper = GraphicBufferMapper::get();
@@ -474,7 +475,8 @@
             pixels[col] = expectedPixel;
         }
         // Point to the next row
-        pixels = pixels + (buff.stride / sizeof(*pixels));
+        // NOTE:  stride retrieved from gralloc is in units of pixels
+        pixels = pixels + buff.stride;
     }
 
     // Release our output buffer

evs/1.0/default/EvsCamera.h

diff --git a/evs/1.0/default/EvsCamera.h b/evs/1.0/default/EvsCamera.h
index 8d644a0..02a677c 100644
--- a/evs/1.0/default/EvsCamera.h
+++ b/evs/1.0/default/EvsCamera.h
@@ -58,7 +58,7 @@
     unsigned decreaseAvailableFrames_Locked(unsigned numToRemove);
 
     void generateFrames();
-    void fillTestFrame(BufferDesc buff);
+    void fillTestFrame(const BufferDesc& buff);
 
     CameraDesc                  mDescription = {};  // The properties of this camera
 

evs/1.0/default/EvsDisplay.cpp

diff --git a/evs/1.0/default/EvsDisplay.cpp b/evs/1.0/default/EvsDisplay.cpp
index 7208395..bbfff35 100644
--- a/evs/1.0/default/EvsDisplay.cpp
+++ b/evs/1.0/default/EvsDisplay.cpp
@@ -169,7 +169,7 @@
         mBuffer.memHandle = handle;
         mFrameBusy = false;
         ALOGD("Allocated new buffer %p with stride %u",
-              mBuffer.memHandle.getNativeHandle(), mStride);
+              mBuffer.memHandle.getNativeHandle(), mBuffer.stride);
     }
 
     // Do we have a frame available?
@@ -263,7 +263,8 @@
                     continue;
                 }
                 // Walk across this row (we'll step rows below)
-                if (pixels[col] != expectedPixel) {
+                uint32_t receivedPixel = pixels[col];
+                if (receivedPixel != expectedPixel) {
                     ALOGE("Pixel check mismatch in frame buffer");
                     frameLooksGood = false;
                     break;
@@ -274,8 +275,8 @@
                 break;
             }
 
-            // Point to the next row
-            pixels = pixels + (mStride / sizeof(*pixels));
+            // Point to the next row (NOTE:  gralloc reports stride in units of pixels)
+            pixels = pixels + mBuffer.stride;
         }
 
         // Ensure we don't see the same buffer twice without it being rewritten

evs/1.0/default/EvsDisplay.h

diff --git a/evs/1.0/default/EvsDisplay.h b/evs/1.0/default/EvsDisplay.h
index 6e0111e..f4d7ee9 100644
--- a/evs/1.0/default/EvsDisplay.h
+++ b/evs/1.0/default/EvsDisplay.h
@@ -42,7 +42,6 @@
 private:
     DisplayDesc     mInfo           = {};
     BufferDesc      mBuffer         = {};       // A graphics buffer into which we'll store images
-    uint32_t        mStride         = 0;        // Bytes per line in the buffer
 
     bool            mFrameBusy      = false;    // A flag telling us our buffer is in use
     DisplayState    mRequestedState = DisplayState::NOT_VISIBLE;