Allow NULL for dst_y in planar formats. BUG=libyuv:631 TEST=unittests build/pass

source/planar_functions.cc

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 110 matching lines @@
 // Copy I422.
 LIBYUV_API
 int I422Copy(const uint8* src_y, int src_stride_y,
              const uint8* src_u, int src_stride_u,
              const uint8* src_v, int src_stride_v,
              uint8* dst_y, int dst_stride_y,
              uint8* dst_u, int dst_stride_u,
              uint8* dst_v, int dst_stride_v,
              int width, int height) {
   int halfwidth = (width + 1) >> 1;
-  if (!src_y || !src_u || !src_v ||
-      !dst_y || !dst_u || !dst_v ||
+  if (!src_u || !src_v ||
+      !dst_u || !dst_v ||
       width <= 0 || height == 0) {
     return -1;
   }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
     src_y = src_y + (height - 1) * src_stride_y;
     src_u = src_u + (height - 1) * src_stride_u;
     src_v = src_v + (height - 1) * src_stride_v;
     src_stride_y = -src_stride_y;
     src_stride_u = -src_stride_u;
     src_stride_v = -src_stride_v;
   }
-  CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+
+  if (dst_y) {
+    CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+  }
   CopyPlane(src_u, src_stride_u, dst_u, dst_stride_u, halfwidth, height);
   CopyPlane(src_v, src_stride_v, dst_v, dst_stride_v, halfwidth, height);
   return 0;
 }
 
 // Copy I444.
 LIBYUV_API
 int I444Copy(const uint8* src_y, int src_stride_y,
              const uint8* src_u, int src_stride_u,
              const uint8* src_v, int src_stride_v,
              uint8* dst_y, int dst_stride_y,
              uint8* dst_u, int dst_stride_u,
              uint8* dst_v, int dst_stride_v,
              int width, int height) {
-  if (!src_y || !src_u || !src_v ||
-      !dst_y || !dst_u || !dst_v ||
+  if (!src_u || !src_v ||
+      !dst_u || !dst_v ||
       width <= 0 || height == 0) {
     return -1;
   }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
     src_y = src_y + (height - 1) * src_stride_y;
     src_u = src_u + (height - 1) * src_stride_u;
     src_v = src_v + (height - 1) * src_stride_v;
     src_stride_y = -src_stride_y;
     src_stride_u = -src_stride_u;
     src_stride_v = -src_stride_v;
   }
 
-  CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+  if (dst_y) {
+    CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+  }
   CopyPlane(src_u, src_stride_u, dst_u, dst_stride_u, width, height);
   CopyPlane(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
   return 0;
 }
 
 // Copy I400.
 LIBYUV_API
 int I400ToI400(const uint8* src_y, int src_stride_y,
                uint8* dst_y, int dst_stride_y,
                int width, int height) {
@@ skipping 19 matching lines @@
                int width, int height) {
   if (!src_y || !dst_y || width <= 0 || height == 0) {
     return -1;
   }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
     src_y = src_y + (height - 1) * src_stride_y;
     src_stride_y = -src_stride_y;
   }
+
   CopyPlane(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
   return 0;
 }
 
 // Mirror a plane of data.
 void MirrorPlane(const uint8* src_y, int src_stride_y,
                  uint8* dst_y, int dst_stride_y,
                  int width, int height) {
   int y;
   void (*MirrorRow)(const uint8* src, uint8* dst, int width) = MirrorRow_C;
@@ skipping 2435 matching lines @@
     }
     free_aligned_buffer_64(rows);
   }
   return 0;
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif