Add I422ToRGB565

BUG=libyuv:699
TESTED=LibYUVConvertTest.I420ToARGB_RGB565_Opt

Change-Id: I87943bcad056fbbe051301f45c7dc0ae0620c837
Reviewed-on: https://chromium-review.googlesource.com/478578Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>

include/libyuv/convert_from.h

@@ -200,6 +200,18 @@ int I420ToRGB565(const uint8* src_y,
                  int width,
                  int height);
 
+LIBYUV_API
+int I422ToRGB565(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_frame,
+                 int dst_stride_frame,
+                 int width,
+                 int height);
+
 // Convert I420 To RGB565 with 4x4 dither matrix (16 bytes).
 // Values in dither matrix from 0 to 7 recommended.
 // The order of the dither matrix is first byte is upper left.

source/convert_from.cc

@@ -890,6 +890,75 @@ int I420ToRGB565(const uint8* src_y,
   return 0;
 }
 
+// Convert I422 to RGB565.
+LIBYUV_API
+int I422ToRGB565(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_rgb565,
+                 int dst_stride_rgb565,
+                 int width,
+                 int height) {
+  int y;
+  void (*I422ToRGB565Row)(const uint8* y_buf, const uint8* u_buf,
+                          const uint8* v_buf, uint8* rgb_buf,
+                          const struct YuvConstants* yuvconstants, int width) =
+      I422ToRGB565Row_C;
+  if (!src_y || !src_u || !src_v || !dst_rgb565 || width <= 0 || height == 0) {
+    return -1;
+  }
+  // Negative height means invert the image.
+  if (height < 0) {
+    height = -height;
+    dst_rgb565 = dst_rgb565 + (height - 1) * dst_stride_rgb565;
+    dst_stride_rgb565 = -dst_stride_rgb565;
+  }
+#if defined(HAS_I422TORGB565ROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    I422ToRGB565Row = I422ToRGB565Row_Any_SSSE3;
+    if (IS_ALIGNED(width, 8)) {
+      I422ToRGB565Row = I422ToRGB565Row_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_I422TORGB565ROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    I422ToRGB565Row = I422ToRGB565Row_Any_AVX2;
+    if (IS_ALIGNED(width, 16)) {
+      I422ToRGB565Row = I422ToRGB565Row_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_I422TORGB565ROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    I422ToRGB565Row = I422ToRGB565Row_Any_NEON;
+    if (IS_ALIGNED(width, 8)) {
+      I422ToRGB565Row = I422ToRGB565Row_NEON;
+    }
+  }
+#endif
+#if defined(HAS_I422TORGB565ROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    I422ToRGB565Row = I422ToRGB565Row_Any_MSA;
+    if (IS_ALIGNED(width, 8)) {
+      I422ToRGB565Row = I422ToRGB565Row_MSA;
+    }
+  }
+#endif
+
+  for (y = 0; y < height; ++y) {
+    I422ToRGB565Row(src_y, src_u, src_v, dst_rgb565, &kYuvI601Constants, width);
+    dst_rgb565 += dst_stride_rgb565;
+    src_y += src_stride_y;
+    src_u += src_stride_u;
+    src_v += src_stride_v;
+  }
+  return 0;
+}
+
 // Ordered 8x8 dither for 888 to 565.  Values from 0 to 7.
 static const uint8 kDither565_4x4[16] = {
     0, 4, 1, 5, 6, 2, 7, 3, 1, 5, 0, 4, 7, 3, 6, 2,

unit_test/convert_test.cc

@@ -576,6 +576,7 @@ TESTPLANARTOB(I420, 2, 2, RGB565, 2, 2, 1, 9, ARGB, 4)
 TESTPLANARTOB(I420, 2, 2, ARGB1555, 2, 2, 1, 9, ARGB, 4)
 TESTPLANARTOB(I420, 2, 2, ARGB4444, 2, 2, 1, 17, ARGB, 4)
 TESTPLANARTOB(I422, 2, 1, ARGB, 4, 4, 1, 2, ARGB, 4)
+TESTPLANARTOB(I422, 2, 1, RGB565, 2, 2, 1, 9, ARGB, 4)
 TESTPLANARTOB(J422, 2, 1, ARGB, 4, 4, 1, 2, ARGB, 4)
 TESTPLANARTOB(J422, 2, 1, ABGR, 4, 4, 1, 2, ARGB, 4)
 TESTPLANARTOB(H422, 2, 1, ARGB, 4, 4, 1, 2, ARGB, 4)
@@ -1800,7 +1801,7 @@ TESTPLANARTOE(I420, 2, 2, RAW, 1, 3, ARGB, 4)
 TESTPLANARTOE(I420, 2, 2, ARGB, 1, 4, RGB565, 2)
 TESTPLANARTOE(I420, 2, 2, ARGB, 1, 4, ARGB1555, 2)
 TESTPLANARTOE(I420, 2, 2, ARGB, 1, 4, ARGB4444, 2)
-TESTPLANARTOE(I422, 2, 1, ARGB, 1, 4, ARGB, 4)
+TESTPLANARTOE(I422, 2, 1, ARGB, 1, 4,  RGB565, 2)
 TESTPLANARTOE(J422, 2, 1, ARGB, 1, 4, ARGB, 4)
 TESTPLANARTOE(J422, 2, 1, ABGR, 1, 4, ARGB, 4)
 TESTPLANARTOE(H422, 2, 1, ARGB, 1, 4, ARGB, 4)