drm_hwcomposer: implement Gralloc 4 BufferInfoMapperMetadata

Implements the BufferInfoMapperMetadata that uses the
GraphicBufferMapper to set the fields of the hwc_drm_bo_t struct.

New class function GetFds created to obtain the file descriptors from
the native_handle_t. Function is marked weak so that vendors can
override it to match their system if required.

Change-Id: I74445487dec6bda2915b21f4b63804832bfead23
Signed-off-by: Dennis Tsiang <dennis.tsiang@arm.com>
Reviewed-by: Roman Stratiienko <r.stratiienko@gmail.com>

2 files changed, 102 insertions, 3 deletions

diff --git a/bufferinfo/BufferInfoMapperMetadata.cpp b/bufferinfo/BufferInfoMapperMetadata.cpp
index 2725802..3aabeb5 100644
--- a/bufferinfo/BufferInfoMapperMetadata.cpp
+++ b/bufferinfo/BufferInfoMapperMetadata.cpp
@@ -39,9 +39,106 @@ BufferInfoGetter *BufferInfoMapperMetadata::CreateInstance() {
   return new BufferInfoMapperMetadata();
 }
 
-int BufferInfoMapperMetadata::ConvertBoInfo(buffer_handle_t /*handle*/,
-                                            hwc_drm_bo_t * /*bo*/) {
-  return -EINVAL;
+/* The implementation below makes assumptions on the order and number of file
+ * descriptors that Gralloc places in the native_handle_t and as such it very
+ * likely needs to be adapted to match the particular Gralloc implementation
+ * used in the system. For this reason it is been declared as a weak symbol,
+ * so that it can be overridden.
+ */
+int __attribute__((weak))
+BufferInfoMapperMetadata::GetFds(buffer_handle_t handle, hwc_drm_bo_t *bo) {
+  int num_fds = handle->numFds;
+
+  if (num_fds >= 1 && num_fds <= 2) {
+    if (IsDrmFormatRgb(bo->format)) {
+      bo->prime_fds[0] = handle->data[0];
+    } else {
+      bo->prime_fds[0] = bo->prime_fds[1] = bo->prime_fds[2] = handle->data[0];
+    }
+    if (bo->prime_fds[0] <= 0) {
+      ALOGE("Encountered invalid fd %d", bo->prime_fds[0]);
+      return android::BAD_VALUE;
+    }
+
+  } else if (num_fds >= 3) {
+    bo->prime_fds[0] = handle->data[0];
+    bo->prime_fds[1] = handle->data[1];
+    bo->prime_fds[2] = handle->data[2];
+    for (int i = 0; i < 3; i++) {
+      if (bo->prime_fds[i] <= 0) {
+        ALOGE("Encountered invalid fd %d", bo->prime_fds[i]);
+        return android::BAD_VALUE;
+      }
+    }
+  }
+  return 0;
+}
+
+int BufferInfoMapperMetadata::ConvertBoInfo(buffer_handle_t handle,
+                                            hwc_drm_bo_t *bo) {
+  GraphicBufferMapper &mapper = GraphicBufferMapper::getInstance();
+  if (!handle)
+    return -EINVAL;
+
+  uint64_t usage = 0;
+  int err = mapper.getUsage(handle, &usage);
+  if (err) {
+    ALOGE("Failed to get usage err=%d", err);
+    return err;
+  }
+  bo->usage = static_cast<uint32_t>(usage);
+
+  ui::PixelFormat hal_format;
+  err = mapper.getPixelFormatRequested(handle, &hal_format);
+  if (err) {
+    ALOGE("Failed to get HAL Pixel Format err=%d", err);
+    return err;
+  }
+  bo->hal_format = static_cast<uint32_t>(hal_format);
+
+  err = mapper.getPixelFormatFourCC(handle, &bo->format);
+  if (err) {
+    ALOGE("Failed to get FourCC format err=%d", err);
+    return err;
+  }
+
+  err = mapper.getPixelFormatModifier(handle, &bo->modifiers[0]);
+  if (err) {
+    ALOGE("Failed to get DRM Modifier err=%d", err);
+    return err;
+  }
+  bo->with_modifiers = true;
+
+  uint64_t width = 0;
+  err = mapper.getWidth(handle, &width);
+  if (err) {
+    ALOGE("Failed to get Width err=%d", err);
+    return err;
+  }
+  bo->width = static_cast<uint32_t>(width);
+
+  uint64_t height = 0;
+  err = mapper.getHeight(handle, &height);
+  if (err) {
+    ALOGE("Failed to get Height err=%d", err);
+    return err;
+  }
+  bo->height = static_cast<uint32_t>(height);
+
+  std::vector<ui::PlaneLayout> layouts;
+  err = mapper.getPlaneLayouts(handle, &layouts);
+  if (err) {
+    ALOGE("Failed to get Plane Layouts err=%d", err);
+    return err;
+  }
+
+  for (uint32_t i = 0; i < layouts.size(); i++) {
+    bo->modifiers[i] = bo->modifiers[0];
+    bo->pitches[i] = layouts[i].strideInBytes;
+    bo->offsets[i] = layouts[i].offsetInBytes;
+  }
+
+  return GetFds(handle, bo);
 }
 
 }  // namespace android
diff --git a/bufferinfo/BufferInfoMapperMetadata.h b/bufferinfo/BufferInfoMapperMetadata.h
index 49c788a..d335705 100644
--- a/bufferinfo/BufferInfoMapperMetadata.h
+++ b/bufferinfo/BufferInfoMapperMetadata.h
@@ -27,6 +27,8 @@ class BufferInfoMapperMetadata : public BufferInfoGetter {
 
   int ConvertBoInfo(buffer_handle_t handle, hwc_drm_bo_t *bo) override;
 
+  int GetFds(buffer_handle_t handle, hwc_drm_bo_t *bo);
+
   static BufferInfoGetter *CreateInstance();
 };
 }  // namespace android