From ae0570951d4ea251a83902bc8fc48e5fe089b08b Mon Sep 17 00:00:00 2001
From: Ramakant Singh <ramaka@codeaurora.org>
Date: Thu, 31 Aug 2017 12:34:54 +0530
Subject: [PATCH] sdm: Add support for single buffer layers

Add support for single buffer layers. Graphics writes to the same
buffer being read by display. For dumb panels, there should be no
idle mode, smart panels should be put in an auto-refresh mode. Also
such layers cannot be sent to framebuffer.
Change-Id: Id4f15239d8edc258524dfddd4e9d72c67cd2406f
CRs-fixed: 1114808
---
 libgralloc1/gr_buf_mgr.cpp    | 11 +++++++++++
 sdm/libs/hwc2/hwc_display.cpp |  9 ++++++++-
 sdm/libs/hwc2/hwc_layers.cpp  | 18 ++++++++++++++++++
 sdm/libs/hwc2/hwc_layers.h    |  4 ++++
 4 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/libgralloc1/gr_buf_mgr.cpp b/libgralloc1/gr_buf_mgr.cpp
index cd89d41b..7966053f 100644
--- a/libgralloc1/gr_buf_mgr.cpp
+++ b/libgralloc1/gr_buf_mgr.cpp
@@ -809,6 +809,17 @@ gralloc1_error_t BufferManager::Perform(int operation, va_list args) {
       }
     } break;
 
+    case GRALLOC_MODULE_PERFORM_SET_SINGLE_BUFFER_MODE: {
+      private_handle_t* hnd =  va_arg(args, private_handle_t*);
+      uint32_t *enable = va_arg(args, uint32_t*);
+      if (private_handle_t::validate(hnd) != 0) {
+        return GRALLOC1_ERROR_BAD_HANDLE;
+      }
+      if (setMetaData(hnd, SET_SINGLE_BUFFER_MODE, enable) != 0) {
+        return GRALLOC1_ERROR_UNSUPPORTED;
+      }
+    } break;
+
     default:
       break;
   }
diff --git a/sdm/libs/hwc2/hwc_display.cpp b/sdm/libs/hwc2/hwc_display.cpp
index 51b485e7..43235bff 100644
--- a/sdm/libs/hwc2/hwc_display.cpp
+++ b/sdm/libs/hwc2/hwc_display.cpp
@@ -529,6 +529,12 @@ void HWCDisplay::BuildLayerStack() {
       secure_display_active = true;
     }
 
+    if (hwc_layer->IsSingleBuffered() &&
+       !(hwc_layer->IsRotationPresent() || hwc_layer->IsScalingPresent())) {
+      layer->flags.single_buffer = true;
+      layer_stack_.flags.single_buffered_layer_present = true;
+    }
+
     if (hwc_layer->GetClientRequestedCompositionType() == HWC2::Composition::Cursor) {
       // Currently we support only one HWCursor & only at top most z-order
       if ((*layer_set_.rbegin())->GetId() == hwc_layer->GetId()) {
@@ -2039,7 +2045,8 @@ bool HWCDisplay::CanSkipValidate() {
   }
 
   // Layer Stack checks
-  if (layer_stack_.flags.hdr_present && (tone_mapper_ && tone_mapper_->IsActive())) {
+  if ((layer_stack_.flags.hdr_present && (tone_mapper_ && tone_mapper_->IsActive())) ||
+     layer_stack_.flags.single_buffered_layer_present) {
     DLOGV_IF(kTagClient, "HDR content present with tone mapping enabled. Returning false.");
     return false;
   }
diff --git a/sdm/libs/hwc2/hwc_layers.cpp b/sdm/libs/hwc2/hwc_layers.cpp
index bf660b53..d88c9fcf 100644
--- a/sdm/libs/hwc2/hwc_layers.cpp
+++ b/sdm/libs/hwc2/hwc_layers.cpp
@@ -769,6 +769,9 @@ DisplayError HWCLayer::SetMetaData(const private_handle_t *pvt_handle, Layer *la
     GetUBWCStatsFromMetaData(&cr_stats[0], &(layer_buffer->ubwc_crstats[0]));
   }  // if (getMetaData)
 
+  single_buffer_ = false;
+  getMetaData(const_cast<private_handle_t *>(handle), GET_SINGLE_BUFFER_MODE, &single_buffer_);
+
   return kErrorNone;
 }
 
@@ -888,4 +891,19 @@ int32_t HWCLayer::PopReleaseFence(void) {
   return fence;
 }
 
+bool HWCLayer::IsRotationPresent() {
+  return ((layer_->transform.rotation != 0.0f) ||
+         layer_->transform.flip_horizontal ||
+         layer_->transform.flip_vertical);
+}
+
+bool HWCLayer::IsScalingPresent() {
+  uint32_t src_width  = static_cast<uint32_t>(layer_->src_rect.right - layer_->src_rect.left);
+  uint32_t src_height = static_cast<uint32_t>(layer_->src_rect.bottom - layer_->src_rect.top);
+  uint32_t dst_width  = static_cast<uint32_t>(layer_->dst_rect.right - layer_->dst_rect.left);
+  uint32_t dst_height = static_cast<uint32_t>(layer_->dst_rect.bottom - layer_->dst_rect.top);
+
+  return ((src_width != dst_width) || (dst_height != src_height));
+}
+
 }  // namespace sdm
diff --git a/sdm/libs/hwc2/hwc_layers.h b/sdm/libs/hwc2/hwc_layers.h
index a7b65c8e..5f5792fa 100644
--- a/sdm/libs/hwc2/hwc_layers.h
+++ b/sdm/libs/hwc2/hwc_layers.h
@@ -94,6 +94,9 @@ class HWCLayer {
   bool SupportLocalConversion(ColorPrimaries working_primaries);
   void ResetValidation() { needs_validate_ = false; }
   bool NeedsValidation() { return (needs_validate_ || geometry_changes_); }
+  bool IsSingleBuffered() { return single_buffer_; }
+  bool IsScalingPresent();
+  bool IsRotationPresent();
 
  private:
   Layer *layer_ = nullptr;
@@ -107,6 +110,7 @@ class HWCLayer {
   LayerTransform layer_transform_ = {};
   LayerRect dst_rect_ = {};
   bool needs_validate_ = true;
+  bool single_buffer_ = false;
 
   // Composition requested by client(SF)
   HWC2::Composition client_requested_ = HWC2::Composition::Device;