Add half-float IOSurface GpuMemoryBuffer support

ui/gfx/mac/io_surface.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/gfx/mac/io_surface.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 19 matching lines @@
 int32_t BytesPerElement(gfx::BufferFormat format, int plane) {
   switch (format) {
     case gfx::BufferFormat::R_8:
       DCHECK_EQ(plane, 0);
       return 1;
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
       DCHECK_EQ(plane, 0);
       return 4;
+    case gfx::BufferFormat::RGBA_F16:
+      DCHECK_EQ(plane, 0);
+      return 8;
     case gfx::BufferFormat::YUV_420_BIPLANAR:
       static int32_t bytes_per_element[] = {1, 2};
       DCHECK_LT(static_cast<size_t>(plane), arraysize(bytes_per_element));
       return bytes_per_element[plane];
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::UYVY_422:
       DCHECK_EQ(plane, 0);
       return 2;
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
@@ skipping 13 matching lines @@
 }
 
 int32_t PixelFormat(gfx::BufferFormat format) {
   switch (format) {
     case gfx::BufferFormat::R_8:
       return 'L008';
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
       return 'BGRA';
+    case gfx::BufferFormat::RGBA_F16:
+      return 'RGhA';
     case gfx::BufferFormat::YUV_420_BIPLANAR:
       return '420v';
     case gfx::BufferFormat::UYVY_422:
       return '2vuy';
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::DXT1:
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
@@ skipping 121 matching lines @@
     // Note that nullptr is an acceptable input to IOSurfaceSetValue.
     IOSurfaceSetValue(surface, CFSTR("IOSurfaceColorSpace"), color_space_icc);
   }
 
   UMA_HISTOGRAM_TIMES("GPU.IOSurface.CreateTime",
                       base::TimeTicks::Now() - start_time);
   return surface;
 }
 
 }  // namespace gfx