gpu: support R16 GPUMemoryBuffer

ui/gl/gl_image_native_pixmap.cc

 // Copyright 2016 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/gl_image_native_pixmap.h"
 
 #include <vector>
 
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gl/gl_surface_egl.h"
 
 #define FOURCC(a, b, c, d)                                        \
   ((static_cast<uint32_t>(a)) | (static_cast<uint32_t>(b) << 8) | \
    (static_cast<uint32_t>(c) << 16) | (static_cast<uint32_t>(d) << 24))
 
 #define DRM_FORMAT_R8 FOURCC('R', '8', ' ', ' ')
+#define DRM_FORMAT_R16 FOURCC('R', '1', '6', ' ')

[Ken Russell (switch to Gerrit), 2017/06/09 22:37:39]

Note: I did a quick web search and confirmed that this FOURCC code seems to be
valid.

 #define DRM_FORMAT_GR88 FOURCC('G', 'R', '8', '8')
 #define DRM_FORMAT_RGB565 FOURCC('R', 'G', '1', '6')
 #define DRM_FORMAT_ARGB8888 FOURCC('A', 'R', '2', '4')
 #define DRM_FORMAT_ABGR8888 FOURCC('A', 'B', '2', '4')
 #define DRM_FORMAT_XRGB8888 FOURCC('X', 'R', '2', '4')
 #define DRM_FORMAT_XBGR8888 FOURCC('X', 'B', '2', '4')
 #define DRM_FORMAT_YVU420 FOURCC('Y', 'V', '1', '2')
 #define DRM_FORMAT_NV12 FOURCC('N', 'V', '1', '2')
 
 namespace gl {
 namespace {
 
 bool ValidInternalFormat(unsigned internalformat, gfx::BufferFormat format) {
   switch (internalformat) {
     case GL_RGB:
       return format == gfx::BufferFormat::BGR_565 ||
              format == gfx::BufferFormat::RGBX_8888 ||
              format == gfx::BufferFormat::BGRX_8888;
     case GL_RGB_YCRCB_420_CHROMIUM:
       return format == gfx::BufferFormat::YVU_420;
     case GL_RGB_YCBCR_420V_CHROMIUM:
       return format == gfx::BufferFormat::YUV_420_BIPLANAR;
     case GL_RGBA:
       return format == gfx::BufferFormat::RGBA_8888;
     case GL_BGRA_EXT:
       return format == gfx::BufferFormat::BGRA_8888;
     case GL_RED_EXT:
       return format == gfx::BufferFormat::R_8;
+    case GL_R16_EXT:
+      return format == gfx::BufferFormat::R_16;
     case GL_RG_EXT:
       return format == gfx::BufferFormat::RG_88;
     default:
       return false;
   }
 }
 
 bool ValidFormat(gfx::BufferFormat format) {
   switch (format) {
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::R_16:
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::YVU_420:
     case gfx::BufferFormat::YUV_420_BIPLANAR:
       return true;
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::DXT1:
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_F16:
     case gfx::BufferFormat::UYVY_422:
       return false;
   }
 
   NOTREACHED();
   return false;
 }
 
 EGLint FourCC(gfx::BufferFormat format) {
   switch (format) {
     case gfx::BufferFormat::R_8:
       return DRM_FORMAT_R8;
+    case gfx::BufferFormat::R_16:
+      return DRM_FORMAT_R16;
     case gfx::BufferFormat::RG_88:
       return DRM_FORMAT_GR88;
     case gfx::BufferFormat::BGR_565:
       return DRM_FORMAT_RGB565;
     case gfx::BufferFormat::RGBA_8888:
       return DRM_FORMAT_ABGR8888;
     case gfx::BufferFormat::RGBX_8888:
       return DRM_FORMAT_XBGR8888;
     case gfx::BufferFormat::BGRA_8888:
       return DRM_FORMAT_ARGB8888;
@@ skipping 150 matching lines @@
   // TODO(ericrk): Implement GLImage OnMemoryDump. crbug.com/514914
 }
 
 // static
 unsigned GLImageNativePixmap::GetInternalFormatForTesting(
     gfx::BufferFormat format) {
   DCHECK(ValidFormat(format));
   switch (format) {
     case gfx::BufferFormat::R_8:
       return GL_RED_EXT;
+    case gfx::BufferFormat::R_16:
+      return GL_R16_EXT;
     case gfx::BufferFormat::RG_88:
       return GL_RG_EXT;
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::BGRX_8888:
       return GL_RGB;
     case gfx::BufferFormat::RGBA_8888:
       return GL_RGBA;
     case gfx::BufferFormat::BGRA_8888:
       return GL_BGRA_EXT;
@@ skipping 11 matching lines @@
     case gfx::BufferFormat::UYVY_422:
       NOTREACHED();
       return GL_NONE;
   }
 
   NOTREACHED();
   return GL_NONE;
 }
 
 }  // namespace gl