[x265] [PATCH] Adapting lowress frame dimensions to multiples of lowress CU size

[shazeb at multicorewareinc.com]

# HG changeset patch
# User Shazeb Nawaz Khan <shazeb at multicorewareinc.com>
# Date 1379926862 -19800
#      Mon Sep 23 14:31:02 2013 +0530
# Node ID fad6eaab768aeb01f2dc865062271366400edb8c
# Parent  ff797c5087ae1547b01168eecc300cf7be981243
Adapting lowress frame dimensions to multiples of lowress CU size.

The full res frame is required to be extended accordingly to achieve a lowres frame with dimensions in multiples of lowres CU size.

diff -r ff797c5087ae -r fad6eaab768a source/common/lowres.cpp
--- a/source/common/lowres.cpp	Fri Sep 20 14:21:29 2013 -0500
+++ b/source/common/lowres.cpp	Mon Sep 23 14:31:02 2013 +0530
@@ -37,6 +37,13 @@
     lumaStride = width + 2 * orig->getLumaMarginX();
     if (lumaStride & 31)
         lumaStride += 32 - (lumaStride & 31);
+    int cuWidth = (width + X265_LOWRES_CU_SIZE - 1) >> X265_LOWRES_CU_BITS;
+    int cuHeight = (lines + X265_LOWRES_CU_SIZE - 1) >> X265_LOWRES_CU_BITS;
+    int cuCount = cuWidth * cuHeight;
+
+    /* rounding the width to multiple of lowres CU size */
+    width = cuWidth * X265_LOWRES_CU_SIZE;
+    lines = cuHeight * X265_LOWRES_CU_SIZE;
 
     /* allocate lowres buffers */
     for (int i = 0; i < 4; i++)
@@ -50,10 +57,6 @@
     lowresPlane[2] = buffer[2] + padoffset;
     lowresPlane[3] = buffer[3] + padoffset;
 
-    int cuWidth = (width + X265_LOWRES_CU_SIZE - 1) >> X265_LOWRES_CU_BITS;
-    int cuHeight = (lines + X265_LOWRES_CU_SIZE - 1) >> X265_LOWRES_CU_BITS;
-    int cuCount = cuWidth * cuHeight;
-
     intraCost = (int*)X265_MALLOC(int, cuCount);
 
     for (int i = 0; i < bframes + 2; i++)
@@ -127,6 +130,31 @@
         lowresMvs[1][i][0].x = 0x7FFF;
     }
 
+    int y, extWidth = (orig->getWidth() + X265_LOWRES_CU_SIZE - 1);
+    int srcStride = orig->getStride();
+    int srcHeight = orig->getHeight();
+    int srcWidth  = orig->getWidth();
+    Pel *src;
+    src = orig->getLumaAddr();
+    
+    /* extending right margin*/
+    if( 2 * width > orig->getWidth())
+    {
+        for (y = 0; y < srcHeight; y++)
+        {
+            ::memset(src+srcWidth, src[srcWidth-1], sizeof(Pel) * (X265_LOWRES_CU_SIZE - 1));
+            src += srcStride;
+        }
+    }
+
+    /* extending bottom margin */
+    src = orig->getLumaAddr() + (srcHeight - 1 ) * srcStride;
+
+    for (y = 1; y <= 2 * lines - srcHeight; y++)
+    {
+        ::memcpy(src + y * srcStride, src, sizeof(Pel) * (extWidth));
+    }
+
     /* downscale and generate 4 HPEL planes for lookahead */
     primitives.frame_init_lowres_core(orig->getLumaAddr(),
         lowresPlane[0], lowresPlane[1], lowresPlane[2], lowresPlane[3],