gpu: Add YCbCr 420v extension.

ui/gl/test/gl_image_test_support.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/test/gl_image_test_support.h"
 
 #include <vector>
 
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/test/gl_surface_test_support.h"
@@ skipping 21 matching lines @@
 
 // static
 void GLImageTestSupport::CleanupGL() {
   ClearGLBindings();
 }
 
 // static
 void GLImageTestSupport::SetBufferDataToColor(int width,
                                               int height,
                                               int stride,
+                                              int plane,
                                               BufferFormat format,
                                               const uint8_t color[4],
                                               uint8_t* data) {
   switch (format) {
     case BufferFormat::RGBX_8888:
+      DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
           data[y * stride + x * 4 + 0] = color[0];
           data[y * stride + x * 4 + 1] = color[1];
           data[y * stride + x * 4 + 2] = color[2];
           data[y * stride + x * 4 + 3] = 0xaa;  // unused
         }
       }
       return;
     case BufferFormat::RGBA_8888:
+      DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
           data[y * stride + x * 4 + 0] = color[0];
           data[y * stride + x * 4 + 1] = color[1];
           data[y * stride + x * 4 + 2] = color[2];
           data[y * stride + x * 4 + 3] = color[3];
         }
       }
       return;
     case BufferFormat::BGRX_8888:
+      DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
           data[y * stride + x * 4 + 0] = color[2];
           data[y * stride + x * 4 + 1] = color[1];
           data[y * stride + x * 4 + 2] = color[0];
           data[y * stride + x * 4 + 3] = 0xaa;  // unused
         }
       }
       return;
     case BufferFormat::BGRA_8888:
+      DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
           data[y * stride + x * 4 + 0] = color[2];
           data[y * stride + x * 4 + 1] = color[1];
           data[y * stride + x * 4 + 2] = color[0];
           data[y * stride + x * 4 + 3] = color[3];
         }
       }
       return;
+    case BufferFormat::YUV_420_BIPLANAR: {
+      DCHECK_LT(plane, 2);
+      DCHECK_EQ(0, height % 2);
+      DCHECK_EQ(0, width % 2);
+      // These values are used in the transformation from YUV to RGB color
+      // values. They are taken from the following webpage:
+      // http://www.fourcc.org/fccyvrgb.php
+      uint8_t yuv[] = {
+          (0.257 * color[0]) + (0.504 * color[1]) + (0.098 * color[2]) + 16,
+          -(0.148 * color[0]) - (0.291 * color[1]) + (0.439 * color[2]) + 128,
+          (0.439 * color[0]) - (0.368 * color[1]) - (0.071 * color[2]) + 128};
+      if (plane == 0) {
+        for (int y = 0; y < height; ++y) {
+          for (int x = 0; x < width; ++x) {
+            data[stride * y + x] = yuv[0];
+          }
+        }
+      } else {
+        for (int y = 0; y < height / 2; ++y) {
+          for (int x = 0; x < width / 2; ++x) {
+            data[stride * y + x * 2] = yuv[1];
+            data[stride * y + x * 2 + 1] = yuv[2];
+          }
+        }
+      }
+      return;
+    }
     case BufferFormat::ATC:
     case BufferFormat::ATCIA:
     case BufferFormat::DXT1:
     case BufferFormat::DXT5:
     case BufferFormat::ETC1:
     case BufferFormat::R_8:
     case BufferFormat::RGBA_4444:
     case BufferFormat::UYVY_422:
-    case BufferFormat::YUV_420_BIPLANAR:
     case BufferFormat::YUV_420:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
 
 }  // namespace gfx