commit bd2d083c79e70056e2e60c8f04eea4726f20c7e6
author Saurabh Shah <saurshah@codeaurora.org> Thu Apr 04 14:33:08 2013 -0700
committer Saurabh Shah <saurshah@codeaurora.org> Thu Apr 18 10:08:27 2013 -0700
tree 13801e604f796260ddfb346deadb6b8894d2324b
parent dd9e75b665130c7aafb456afd3bba1070e70a0ba

overlay: Add support for decimation.

Add support for decimation on top of what MDP can downscale,
because decimation can have quality issues.
B-family MDP downscale of 1/4, plus decimation of 1/16 can let
us have a total downscale of 1/64.

Also decimate by 2 (min) if width is greater than what layer mixer
supports and is not handled by the client.

Change-Id: I3b7c4bf321c7561bd98206ad118f4ac1ee2879ae

libqdutils/mdp_version.cpp

diff --git a/libqdutils/mdp_version.cpp b/libqdutils/mdp_version.cpp
index cd21490..8da293d 100644
--- a/libqdutils/mdp_version.cpp
+++ b/libqdutils/mdp_version.cpp
@@ -44,8 +44,12 @@
     struct fb_fix_screeninfo fb_finfo;
 
     mMdpRev = 0;
-    mRGBPipes = mVGPipes = 0;
+    mRGBPipes = 0;
+    mVGPipes = 0;
     mDMAPipes = 0;
+    mFeatures = 0;
+    //TODO get this from driver, default for A-fam to 8
+    mMDPDownscale = 8;
 
     if (ioctl(fb_fd, FBIOGET_FSCREENINFO, &fb_finfo) < 0) {
         ALOGE("FBIOGET_FSCREENINFO failed");
@@ -80,6 +84,7 @@
                 mRGBPipes = metadata.data.caps.rgb_pipes;
                 mVGPipes = metadata.data.caps.vig_pipes;
                 mDMAPipes = metadata.data.caps.dma_pipes;
+                mFeatures = metadata.data.caps.features;
             }
 #endif
         } else {
@@ -96,7 +101,21 @@
     mHasOverlay = false;
     if((mMDPVersion >= MDP_V4_0) || (mMDPVersion == MDP_V_UNKNOWN))
         mHasOverlay = true;
+    if(mMDPVersion >= MDSS_V5) {
+        //TODO get this from driver
+        mMDPDownscale = 4;
+    }
+
     mPanelType = panel_type;
 }
+
+bool MDPVersion::supportsDecimation() {
+    return mFeatures & MDP_DECIMATION_EN;
+}
+
+uint32_t MDPVersion::getMaxMDPDownscale() {
+    return mMDPDownscale;
+}
+
 }; //namespace qdutils
 

libqdutils/mdp_version.h

diff --git a/libqdutils/mdp_version.h b/libqdutils/mdp_version.h
index 98de371..2fca640 100644
--- a/libqdutils/mdp_version.h
+++ b/libqdutils/mdp_version.h
@@ -52,6 +52,10 @@
     MDSS_V5     = 500,
 };
 
+enum {
+    MAX_DISPLAY_DIM = 2048,
+};
+
 #define MDDI_PANEL       '1'
 #define EBI2_PANEL       '2'
 #define LCDC_PANEL       '3'
@@ -76,6 +80,8 @@
     uint8_t getRGBPipes() { return mRGBPipes; }
     uint8_t getVGPipes() { return mVGPipes; }
     uint8_t getDMAPipes() { return mDMAPipes; }
+    bool supportsDecimation();
+    uint32_t getMaxMDPDownscale();
 private:
     int mMDPVersion;
     char mPanelType;
@@ -84,6 +90,8 @@
     uint8_t mRGBPipes;
     uint8_t mVGPipes;
     uint8_t mDMAPipes;
+    uint32_t mFeatures;
+    uint32_t mMDPDownscale;
 };
 }; //namespace qdutils
 #endif //INCLUDE_LIBQCOMUTILS_MDPVER