Add half-float IOSurface GpuMemoryBuffer support

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/gfx/half_float.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/init/gl_factory.h"
 #include "ui/gl/test/gl_surface_test_support.h"
 
 #if defined(USE_OZONE)
 #include "base/run_loop.h"
 #include "ui/ozone/public/ozone_platform.h"
 #endif
 
 namespace gl {
@@ skipping 87 matching lines @@
       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 gfx::BufferFormat::RGBA_F16: {
+      DCHECK_EQ(0, plane);
+      float float_color[4] = {
+          color[0] / 255.f, color[1] / 255.f, color[2] / 255.f,
+          color[3] / 255.f,
+      };
+      uint16_t half_float_color[4];
+      gfx::FloatToHalfFloat(float_color, half_float_color, 4);
+      for (int y = 0; y < height; ++y) {
+        uint16_t* row = reinterpret_cast<uint16_t*>(data + y * stride);
+        for (int x = 0; x < width; ++x) {
+          row[x * 4 + 0] = half_float_color[0];
+          row[x * 4 + 1] = half_float_color[1];
+          row[x * 4 + 2] = half_float_color[2];
+          row[x * 4 + 3] = half_float_color[3];
+        }
+      }
+      return;
+    }
     case gfx::BufferFormat::YVU_420: {
       DCHECK_LT(plane, 3);
       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 yvu[] = {
           (0.257 * color[0]) + (0.504 * color[1]) + (0.098 * color[2]) + 16,
           (0.439 * color[0]) - (0.368 * color[1]) - (0.071 * color[2]) + 128,
@@ skipping 47 matching lines @@
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::UYVY_422:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
 
 }  // namespace gl