commit d5b369f320fb8fbc0d23d6b49f91088cd596db9f
author Ramakant Singh <ramaka@codeaurora.org> Tue Dec 09 23:03:43 2014 +0530
committer Gerrit - the friendly Code Review server <code-review@localhost> Wed Mar 04 03:47:21 2015 -0800
tree 7ab9f6b0db258bfc1b918081ceba57d477b8bb63
parent 17fabdba250d221389468db1f67d049ab08f4ea4

hwc: Handle alpha scaling in mdp3.

MDP3 loosing alpha value in case of scaling up
and down.Hence we can't scale up or down alpha layer
more than its hw capability(4x).
CRs-Fixed: 766561

Change-Id: Id168f8331e08700903774227ee8e9bff61e5bfd4

libhwcomposer/hwc_copybit.cpp

diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 65482d7..05aeb5e 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -352,10 +352,18 @@
             dx = (float)dst_w/(float)src_w;
             dy = (float)dst_h/(float)src_h;
 
-            if (dx > MAX_SCALE_FACTOR || dx < MIN_SCALE_FACTOR)
+            float scale_factor_max = MAX_SCALE_FACTOR;
+            float scale_factor_min = MIN_SCALE_FACTOR;
+
+            if (isAlphaPresent(layer)) {
+               scale_factor_max = MAX_SCALE_FACTOR/4;
+               scale_factor_min = MIN_SCALE_FACTOR*4;
+            }
+
+            if (dx > scale_factor_max || dx < scale_factor_min)
                 return false;
 
-            if (dy > MAX_SCALE_FACTOR || dy < MIN_SCALE_FACTOR)
+            if (dy > scale_factor_max || dy < scale_factor_min)
                 return false;
         }
     }