gpu: Add YCbCr 420v extension.

ui/gl/test/gl_image_test_support.cc

Index: ui/gl/test/gl_image_test_support.cc
diff --git a/ui/gl/test/gl_image_test_support.cc b/ui/gl/test/gl_image_test_support.cc
index 587d13952388c8c89f6b4cfd869d89dd012d348f..48d6a40612e4465e320080c6cfea358932465e6e 100644
--- a/ui/gl/test/gl_image_test_support.cc
+++ b/ui/gl/test/gl_image_test_support.cc
@@ -38,50 +38,89 @@ void GLImageTestSupport::CleanupGL() {
 // static
 void GLImageTestSupport::SetBufferDataToColor(int width,
                                               int height,
-                                              int stride,
+                                              int strides[],
                                               BufferFormat format,
                                               const uint8_t color[4],
-                                              uint8_t* data) {
+                                              uint8_t* data[]) {
   switch (format) {
-    case BufferFormat::RGBX_8888:
+    case BufferFormat::RGBX_8888: {
+      uint8_t* rgbx_data = data[0];
+      int stride = strides[0];
       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
+          rgbx_data[y * stride + x * 4 + 0] = color[0];
+          rgbx_data[y * stride + x * 4 + 1] = color[1];
+          rgbx_data[y * stride + x * 4 + 2] = color[2];
+          rgbx_data[y * stride + x * 4 + 3] = 0xaa;  // unused
         }
       }
+    }
       return;
-    case BufferFormat::RGBA_8888:
+    case BufferFormat::RGBA_8888: {
+      uint8_t* rgba_data = data[0];
+      int stride = strides[0];
       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];
+          rgba_data[y * stride + x * 4 + 0] = color[0];
+          rgba_data[y * stride + x * 4 + 1] = color[1];
+          rgba_data[y * stride + x * 4 + 2] = color[2];
+          rgba_data[y * stride + x * 4 + 3] = color[3];
         }
       }
+    }
       return;
-    case BufferFormat::BGRX_8888:
+    case BufferFormat::BGRX_8888: {
+      uint8_t* bgrx_data = data[0];
+      int stride = strides[0];
       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
+          bgrx_data[y * stride + x * 4 + 0] = color[2];
+          bgrx_data[y * stride + x * 4 + 1] = color[1];
+          bgrx_data[y * stride + x * 4 + 2] = color[0];
+          bgrx_data[y * stride + x * 4 + 3] = 0xaa;  // unused
         }
       }
+    }
       return;
-    case BufferFormat::BGRA_8888:
+    case BufferFormat::BGRA_8888: {
+      uint8_t* bgra_data = data[0];
+      int stride = strides[0];
       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];
+          bgra_data[y * stride + x * 4 + 0] = color[2];
+          bgra_data[y * stride + x * 4 + 1] = color[1];
+          bgra_data[y * stride + x * 4 + 2] = color[0];
+          bgra_data[y * stride + x * 4 + 3] = color[3];
+        }
+      }
+    }
+      return;
+    case BufferFormat::YUV_420_BIPLANAR: {
+      // 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};
+      uint8_t* y_data = data[0];
+      uint8_t* uv_data = data[1];
+      int y_stride = strides[0];
+      int uv_stride = strides[1];
+      for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+          y_data[y_stride * y + x] = yuv[0];
+        }
+      }
+      DCHECK(height % 2 == 0);
+      DCHECK(width % 2 == 0);
+      for (int y = 0; y < height / 2; ++y) {
+        for (int x = 0; x < width / 2; ++x) {
+          uv_data[uv_stride * y + x * 2] = yuv[1];
+          uv_data[uv_stride * y + x * 2 + 1] = yuv[2];
         }
       }
+    }
       return;
     case BufferFormat::ATC:
     case BufferFormat::ATCIA:
@@ -91,7 +130,6 @@ void GLImageTestSupport::SetBufferDataToColor(int width,
     case BufferFormat::R_8:
     case BufferFormat::RGBA_4444:
     case BufferFormat::UYVY_422:
-    case BufferFormat::YUV_420_BIPLANAR:
     case BufferFormat::YUV_420:
       NOTREACHED();
       return;
@@ -99,4 +137,16 @@ void GLImageTestSupport::SetBufferDataToColor(int width,
   NOTREACHED();
 }
 
+// static
+void GLImageTestSupport::SetBufferDataToColor(int width,
+                                              int height,
+                                              int stride,
+                                              BufferFormat format,
+                                              const uint8_t color[4],
+                                              uint8_t* data) {
+  uint8_t* planes_data[] = {data};
+  int strides[] = {stride};
+  SetBufferDataToColor(width, height, strides, format, color, planes_data);
+}
+
 }  // namespace gfx