commit 376d8a8c014a0f9d54c74fac845ade1361f734a7
author Amara Venkata Mastan Manoj Kumar <manojavm@codeaurora.org> Wed Mar 13 19:18:47 2013 -0700
committer Ramkumar Radhakrishnan <ramkumar@codeaurora.org> Thu Aug 22 15:34:29 2013 -0700
tree 29cc87119f884ab34ad27328b1f4a21532bd59d1
parent 31f4c4e7b903f1608a45db22f621703bd9c412f9

hwc: Perform MDP downscaling for WFD/HDMI Scenario

  On WFD/HDMI connection, if the configured resolution is less than
  Primary Resolution, Display HAL does the following:

  1. sends hpd notification to SF with primary resolution.
  2. configures MDP pipes with configured Resolution.

  This is done to improve UI quality as MDP has better downscale
  filter options compared to GPU.

Change-Id: I33570c13016a35ed6c5d22d4c34dfe75b2c605a1

libexternal/external.cpp

diff --git a/libexternal/external.cpp b/libexternal/external.cpp
index b247dfb..89d63e9 100644
--- a/libexternal/external.cpp
+++ b/libexternal/external.cpp
@@ -34,6 +34,7 @@
 #include "external.h"
 #include "overlayUtils.h"
 #include "overlay.h"
+#include "mdp_version.h"
 
 using namespace android;
 
@@ -65,6 +66,11 @@
     return 0;
 }
 
+void ExternalDisplay::getAttributes(int& width, int& height) {
+    int fps = 0;
+    getAttrForMode(width, height, fps);
+}
+
 int ExternalDisplay::teardown() {
     closeFrameBuffer();
     resetInfo();
@@ -564,15 +570,38 @@
     return ret;
 }
 
+
 void ExternalDisplay::setAttributes() {
     int width = 0, height = 0, fps = 0;
     getAttrForMode(width, height, fps);
-
     ALOGD("ExtDisplay setting xres = %d, yres = %d", width, height);
-    mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].xres = width;
-    mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].yres = height;
-    mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].vsync_period =
-        1000000000l / fps;
+    if(mHwcContext) {
+        // Always set dpyAttr res to mVInfo res
+        mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].xres = width;
+        mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].yres = height;
+        mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].mDownScaleMode = false;
+        if(!qdutils::MDPVersion::getInstance().is8x26()) {
+            int priW = mHwcContext->dpyAttr[HWC_DISPLAY_PRIMARY].xres;
+            int priH = mHwcContext->dpyAttr[HWC_DISPLAY_PRIMARY].yres;
+            // if primary resolution is more than the hdmi resolution
+            // configure dpy attr to primary resolution and set
+            // downscale mode
+            if((priW * priH) > (width * height)) {
+                mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].xres = priW;
+                mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].yres = priH;
+                // HDMI is always in landscape, so always assign the higher
+                // dimension to hdmi's xres
+                if(priH > priW) {
+                    mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].xres = priH;
+                    mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].yres = priW;
+                }
+                // Set External Display MDP Downscale mode indicator
+                mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].mDownScaleMode =true;
+            }
+        }
+        mHwcContext->dpyAttr[HWC_DISPLAY_EXTERNAL].vsync_period =
+                1000000000l / fps;
+    }
 }
 
 void ExternalDisplay::getAttrForMode(int& width, int& height, int& fps) {