From 4e8d35a461e7a45f5134715b010ed38be986fb00 Mon Sep 17 00:00:00 2001
From: Alpha Lam <hclam@chromium.org>
Date: Tue, 9 Aug 2011 20:59:45 +0100
Subject: Copy less when active map is in use

When active map is specified and the current frame is not a key frame,
golden frame nor a altref frame then copy only those active regions.

This significantly reduces encoding time by as much as 19% on the test
system where realtime encoding is used. This is particularly useful
when the frame size is large (e.g. 2560x1600) and there's only a few
action macroblocks.

Change-Id: If394a813ec2df5a0201745d1348dbde4278f7ad4
---
 vp8/common/extend.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 vp8/common/extend.h |  4 ++++
 2 files changed, 58 insertions(+)

(limited to 'vp8/common')

diff --git a/vp8/common/extend.c b/vp8/common/extend.c
index a2d325332..9089e1629 100644
--- a/vp8/common/extend.c
+++ b/vp8/common/extend.c
@@ -102,6 +102,60 @@ void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
 }
 
 
+void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
+                                         YV12_BUFFER_CONFIG *dst,
+                                         int srcy, int srcx,
+                                         int srch, int srcw)
+{
+    int et = dst->border;
+    int el = dst->border;
+    int eb = dst->border + dst->y_height - src->y_height;
+    int er = dst->border + dst->y_width - src->y_width;
+    int src_y_offset = srcy * src->y_stride + srcx;
+    int dst_y_offset = srcy * dst->y_stride + srcx;
+    int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
+    int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
+
+    // If the side is not touching the bounder then don't extend.
+    if (srcy)
+      et = 0;
+    if (srcx)
+      el = 0;
+    if (srcy + srch != src->y_height)
+      eb = 0;
+    if (srcx + srcw != src->y_width)
+      er = 0;
+
+    copy_and_extend_plane(src->y_buffer + src_y_offset,
+                          src->y_stride,
+                          dst->y_buffer + dst_y_offset,
+                          dst->y_stride,
+                          srch, srcw,
+                          et, el, eb, er);
+
+    et = (et + 1) >> 1;
+    el = (el + 1) >> 1;
+    eb = (eb + 1) >> 1;
+    er = (er + 1) >> 1;
+    srch = (srch + 1) >> 1;
+    srcw = (srcw + 1) >> 1;
+
+    copy_and_extend_plane(src->u_buffer + src_uv_offset,
+                          src->uv_stride,
+                          dst->u_buffer + dst_uv_offset,
+                          dst->uv_stride,
+                          srch, srcw,
+                          et, el, eb, er);
+
+    copy_and_extend_plane(src->v_buffer + src_uv_offset,
+                          src->uv_stride,
+                          dst->v_buffer + dst_uv_offset,
+                          dst->uv_stride,
+                          srch, srcw,
+                          et, el, eb, er);
+}
+
+
 /* note the extension is only for the last row, for intra prediction purpose */
 void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr, unsigned char *UPtr, unsigned char *VPtr)
 {
diff --git a/vp8/common/extend.h b/vp8/common/extend.h
index 9e0be4e06..74a0b177d 100644
--- a/vp8/common/extend.h
+++ b/vp8/common/extend.h
@@ -17,5 +17,9 @@
 void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr, unsigned char *UPtr, unsigned char *VPtr);
 void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
                                YV12_BUFFER_CONFIG *dst);
+void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
+                                         YV12_BUFFER_CONFIG *dst,
+                                         int srcy, int srcx,
+                                         int srch, int srcw);
 
 #endif
-- 
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