P010ToI010 and P012ToI012 conversion functions

- Convert 10 and 12 bit biplanar formats to planar.
- Shift 10 MSB to 10 LSB
- P010 is similar to NV12 in layout, but uses 10 MSB of 16 bit values.
- I010 is similar to I420 in layout, but uses 10 LSB of 16 bit values.

Bug: libyuv:951
Change-Id: I16a1bc64239d0fa4f41810910da448bf5720935f
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4166560
Reviewed-by: Justin Green <greenjustin@google.com>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>

README.chromium

@@ -1,6 +1,6 @@
 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1856
+Version: 1857
 License: BSD
 License File: LICENSE
 

include/libyuv/convert.h

@@ -604,6 +604,36 @@ int NV16ToNV24(const uint8_t* src_y,
                int width,
                int height);
 
+// Convert P010 to I010.
+LIBYUV_API
+int P010ToI010(const uint16_t* src_y,
+               int src_stride_y,
+               const uint16_t* src_uv,
+               int src_stride_uv,
+               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);
+
+// Convert P012 to I012.
+LIBYUV_API
+int P012ToI012(const uint16_t* src_y,
+               int src_stride_y,
+               const uint16_t* src_uv,
+               int src_stride_uv,
+               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);
+
 // Convert P010 to P410.
 LIBYUV_API
 int P010ToP410(const uint16_t* src_y,

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1856
+#define LIBYUV_VERSION 1857
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/convert.cc

@@ -24,6 +24,7 @@ namespace libyuv {
 extern "C" {
 #endif
 
+// subsample amount uses a shift.
 #define SUBSAMPLE(v, a, s) (v < 0) ? (-((-v + a) >> s)) : ((v + a) >> s)
 static __inline int Abs(int v) {
   return v >= 0 ? v : -v;
@@ -1269,6 +1270,71 @@ int NV16ToNV24(const uint8_t* src_y,
   return 0;
 }
 
+// Any P[420]1[02] to I[420]1[02] format with mirroring.
+static int PxxxToIxxx(const uint16_t* src_y,
+                      int src_stride_y,
+                      const uint16_t* src_uv,
+                      int src_stride_uv,
+                      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,
+                      int subsample_x,
+                      int subsample_y,
+                      int depth) {
+  const int uv_width = SUBSAMPLE(width, subsample_x, subsample_x);
+  const int uv_height = SUBSAMPLE(height, subsample_y, subsample_y);
+  if (width <= 0 || height == 0) {
+    return -1;
+  }
+
+  ConvertToLSBPlane_16(src_y, src_stride_y, dst_y, dst_stride_y, width, height,
+                       depth);
+  SplitUVPlane_16(src_uv, src_stride_uv, dst_u, dst_stride_u, dst_v,
+                  dst_stride_v, uv_width, uv_height, depth);
+  return 0;
+}
+
+LIBYUV_API
+int P010ToI010(const uint16_t* src_y,
+               int src_stride_y,
+               const uint16_t* src_uv,
+               int src_stride_uv,
+               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) {
+  return PxxxToIxxx(src_y, src_stride_y, src_uv, src_stride_uv, dst_y,
+                    dst_stride_y, dst_u, dst_stride_u, dst_v, dst_stride_v,
+                    width, height, 1, 1, 10);
+}
+
+LIBYUV_API
+int P012ToI012(const uint16_t* src_y,
+               int src_stride_y,
+               const uint16_t* src_uv,
+               int src_stride_uv,
+               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) {
+  return PxxxToIxxx(src_y, src_stride_y, src_uv, src_stride_uv, dst_y,
+                    dst_stride_y, dst_u, dst_stride_u, dst_v, dst_stride_v,
+                    width, height, 1, 1, 12);
+}
+
 LIBYUV_API
 int P010ToP410(const uint16_t* src_y,
                int src_stride_y,

unit_test/convert_test.cc

@@ -48,6 +48,7 @@ namespace libyuv {
 #define AR30ToAR30 ARGBCopy
 #define ABGRToABGR ARGBCopy
 
+// subsample amount uses a divide.
 #define SUBSAMPLE(v, a) ((((v) + (a)-1)) / (a))
 
 // Planar test
@@ -649,6 +650,8 @@ TESTBPTOBP(MT2T, uint8_t, 10 / 8, 2, 2, P010, uint16_t, 2, 2, 2, 10, 16, 32)
 TESTBPTOP(NV12, uint8_t, 1, 2, 2, I420, uint8_t, 1, 2, 2, 8, 1, 1)
 TESTBPTOP(NV21, uint8_t, 1, 2, 2, I420, uint8_t, 1, 2, 2, 8, 1, 1)
 TESTBPTOP(MM21, uint8_t, 1, 2, 2, I420, uint8_t, 1, 2, 2, 8, 16, 32)
+TESTBPTOP(P010, uint16_t, 2, 2, 2, I010, uint16_t, 2, 2, 2, 10, 1, 1)
+TESTBPTOP(P012, uint16_t, 2, 2, 2, I012, uint16_t, 2, 2, 2, 12, 1, 1)
 
 // Provide matrix wrappers for full range bt.709
 #define F420ToABGR(a, b, c, d, e, f, g, h, i, j) \