NV12 to/from I420 coalesce rows for Y and UV independently.

BUG=197
TESTED=*NV12*_Opt
Review URL: https://webrtc-codereview.appspot.com/1201004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@607 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 606
+Version: 607
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 606
+#define LIBYUV_VERSION 607
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/convert.cc

@@ -381,8 +381,21 @@ static int X420ToI420(const uint8* src_y,
     dst_stride_u = -dst_stride_u;
     dst_stride_v = -dst_stride_v;
   }
-
+  // Coalesce contiguous rows.
   int halfwidth = (width + 1) >> 1;
+  int halfheight = (height + 1) >> 1;
+  if (src_stride_y0 == width &&
+      src_stride_y1 == width &&
+      dst_stride_y == width) {
+    width = width * height;
+    height = 1;
+  }
+  if (src_stride_uv == width &&
+      dst_stride_u * 2 == width &&
+      dst_stride_v * 2 == width) {
+    halfwidth = halfwidth * halfheight;
+    halfheight = 1;
+  }
   void (*SplitUVRow)(const uint8* src_uv, uint8* dst_u, uint8* dst_v, int pix) =
       SplitUVRow_C;
 #if defined(HAS_SPLITUVROW_SSE2)
@@ -437,7 +450,6 @@ static int X420ToI420(const uint8* src_y,
     }
   }
 
-  int halfheight = (height + 1) >> 1;
   for (int y = 0; y < halfheight; ++y) {
     // Copy a row of UV.
     SplitUVRow(src_uv, dst_u, dst_v, halfwidth);

source/convert_from.cc

@@ -465,12 +465,13 @@ int I420ToNV12(const uint8* src_y, int src_stride_y,
   int halfwidth = (width + 1) >> 1;
   int halfheight = (height + 1) >> 1;
   if (src_stride_y == width &&
-      src_stride_u * 2 == width &&
-      src_stride_v * 2 == width &&
-      dst_stride_y == width &&
-      dst_stride_uv == width) {
+      dst_stride_y == width) {
     width = width * height;
     height = 1;
+  }
+  if (src_stride_u * 2 == width &&
+      src_stride_v * 2 == width &&
+      dst_stride_uv == width) {
     halfwidth = halfwidth * halfheight;
     halfheight = 1;
   }

source/row_any.cc

@@ -19,7 +19,6 @@ extern "C" {
 
 // TODO(fbarchard): Consider 'any' functions handling any quantity of pixels.
 // TODO(fbarchard): Consider 'any' functions handling odd alignment.
-
 // YUV to RGB does multiple of 8 with SIMD and remainder with C.
 #define YANY(NAMEANY, I420TORGB_SIMD, I420TORGB_C, UV_SHIFT, BPP, MASK)        \
     void NAMEANY(const uint8* y_buf,                                           \