Add I410Copy and I410ToI420 methods

The I410To420 implementation does a two step approach for scaling down and 10-to-8 bit conversion using the Y plane as temporal storage.

Bug: libyuv:950
Change-Id: I3d35fad4b99e17253230456233fbd947e013c0ec
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4110783
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/source/planar_functions.cc b/source/planar_functions.cc
index f43525d5..0df22f7b 100644
--- a/source/planar_functions.cc
+++ b/source/planar_functions.cc
@@ -333,6 +333,45 @@ int I210Copy(const uint16_t* src_y,
   return 0;
 }
 
+// Copy I444.
+LIBYUV_API
+int I410Copy(const uint16_t* src_y,
+             int src_stride_y,
+             const uint16_t* src_u,
+             int src_stride_u,
+             const uint16_t* src_v,
+             int src_stride_v,
+             uint16_t* dst_y,
+             int dst_stride_y,
+             uint16_t* dst_u,
+             int dst_stride_u,
+             uint16_t* dst_v,
+             int dst_stride_v,
+             int width,
+             int height) {
+  if ((!src_y && dst_y) || !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;
+  }
+
+  if (dst_y) {
+    CopyPlane_16(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+  }
+  CopyPlane_16(src_u, src_stride_u, dst_u, dst_stride_u, width, height);
+  CopyPlane_16(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
+  return 0;
+}
+
 // Copy I400.
 LIBYUV_API
 int I400ToI400(const uint8_t* src_y,