AVX2 YUV alpha blender and improved unittests

include/libyuv/planar_functions.h

 /*
  *  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 284 matching lines @@
                      int width, int height);
 
 typedef void (*ARGBBlendRow)(const uint8* src_argb0, const uint8* src_argb1,
                              uint8* dst_argb, int width);
 
 // Get function to Alpha Blend ARGB pixels and store to destination.
 LIBYUV_API
 ARGBBlendRow GetARGBBlend();
 
 // Alpha Blend ARGB images and store to destination.
+// Source is pre-multiplied by alpha using ARGBAttenuate.
 // Alpha of destination is set to 255.
 LIBYUV_API
 int ARGBBlend(const uint8* src_argb0, int src_stride_argb0,
               const uint8* src_argb1, int src_stride_argb1,
               uint8* dst_argb, int dst_stride_argb,
               int width, int height);
 
+// Alpha Blend plane and store to destination.
+// Source is not pre-multiplied by alpha.
+LIBYUV_API
+int BlendPlane(const uint8* src_y0, int src_stride_y0,
+               const uint8* src_y1, int src_stride_y1,
+               const uint8* alpha, int alpha_stride,
+               uint8* dst_y, int dst_stride_y,
+               int width, int height);
+
+// Alpha Blend YUV images and store to destination.
+// Source is not pre-multiplied by alpha.
+// Alpha is full width x height and subsampled to half size to apply to UV.
+LIBYUV_API
+int I420Blend(const uint8* src_y0, int src_stride_y0,
+              const uint8* src_u0, int src_stride_u0,
+              const uint8* src_v0, int src_stride_v0,
+              const uint8* src_y1, int src_stride_y1,
+              const uint8* src_u1, int src_stride_u1,
+              const uint8* src_v1, int src_stride_v1,
+              const uint8* alpha, int alpha_stride,
+              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);
+
 // Multiply ARGB image by ARGB image. Shifted down by 8. Saturates to 255.
 LIBYUV_API
 int ARGBMultiply(const uint8* src_argb0, int src_stride_argb0,
                  const uint8* src_argb1, int src_stride_argb1,
                  uint8* dst_argb, int dst_stride_argb,
                  int width, int height);
 
 // Add ARGB image with ARGB image. Saturates to 255.
 LIBYUV_API
 int ARGBAdd(const uint8* src_argb0, int src_stride_argb0,
@@ skipping 144 matching lines @@
 int ARGBSobelXY(const uint8* src_argb, int src_stride_argb,
                 uint8* dst_argb, int dst_stride_argb,
                 int width, int height);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_PLANAR_FUNCTIONS_H_  NOLINT