gpu: support R16 GPUMemoryBuffer

ui/gfx/buffer_format_util.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/buffer_format_util.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/numerics/safe_math.h"
 
 namespace gfx {
 namespace {
 
-const BufferFormat kBufferFormats[] = {
-    BufferFormat::ATC,       BufferFormat::ATCIA,
-    BufferFormat::DXT1,      BufferFormat::DXT5,
-    BufferFormat::ETC1,      BufferFormat::R_8,
-    BufferFormat::RG_88,     BufferFormat::BGR_565,
-    BufferFormat::RGBA_4444, BufferFormat::RGBX_8888,
-    BufferFormat::RGBA_8888, BufferFormat::BGRX_8888,
-    BufferFormat::BGRA_8888, BufferFormat::RGBA_F16,
-    BufferFormat::UYVY_422,  BufferFormat::YUV_420_BIPLANAR,
-    BufferFormat::YVU_420};
+const BufferFormat kBufferFormats[] = {BufferFormat::ATC,
+                                       BufferFormat::ATCIA,
+                                       BufferFormat::DXT1,
+                                       BufferFormat::DXT5,
+                                       BufferFormat::ETC1,
+                                       BufferFormat::R_8,
+                                       BufferFormat::R_16,
+                                       BufferFormat::RG_88,
+                                       BufferFormat::BGR_565,
+                                       BufferFormat::RGBA_4444,
+                                       BufferFormat::RGBX_8888,
+                                       BufferFormat::RGBA_8888,
+                                       BufferFormat::BGRX_8888,
+                                       BufferFormat::BGRA_8888,
+                                       BufferFormat::RGBA_F16,
+                                       BufferFormat::UYVY_422,
+                                       BufferFormat::YUV_420_BIPLANAR,
+                                       BufferFormat::YVU_420};
 
 static_assert(arraysize(kBufferFormats) ==
                   (static_cast<int>(BufferFormat::LAST) + 1),
               "BufferFormat::LAST must be last value of kBufferFormats");
 
 
 bool RowSizeForBufferFormatChecked(
     size_t width, BufferFormat format, size_t plane, size_t* size_in_bytes) {
   base::CheckedNumeric<size_t> checked_size = width;
   switch (format) {
     case BufferFormat::ATCIA:
     case BufferFormat::DXT5:
       DCHECK_EQ(0u, plane);
       *size_in_bytes = width;
       return true;
     case BufferFormat::ATC:
     case BufferFormat::DXT1:
     case BufferFormat::ETC1:
       DCHECK_EQ(0u, plane);
       DCHECK_EQ(0u, width % 2);
       *size_in_bytes = width / 2;
       return true;
     case BufferFormat::R_8:
       checked_size += 3;
       if (!checked_size.IsValid())
         return false;
       *size_in_bytes = (checked_size & ~0x3).ValueOrDie();
       return true;
+    case BufferFormat::R_16:
     case BufferFormat::RG_88:
     case BufferFormat::BGR_565:
     case BufferFormat::RGBA_4444:
     case BufferFormat::UYVY_422:
       checked_size *= 2;
       checked_size += 3;
       if (!checked_size.IsValid())
         return false;
       *size_in_bytes = (checked_size & ~0x3).ValueOrDie();
       return true;
@@ skipping 33 matching lines @@
 }
 
 size_t NumberOfPlanesForBufferFormat(BufferFormat format) {
   switch (format) {
     case BufferFormat::ATC:
     case BufferFormat::ATCIA:
     case BufferFormat::DXT1:
     case BufferFormat::DXT5:
     case BufferFormat::ETC1:
     case BufferFormat::R_8:
+    case BufferFormat::R_16:
     case BufferFormat::RG_88:
     case BufferFormat::BGR_565:
     case BufferFormat::RGBA_4444:
     case BufferFormat::RGBX_8888:
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
     case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 1;
     case BufferFormat::YUV_420_BIPLANAR:
       return 2;
     case BufferFormat::YVU_420:
       return 3;
   }
   NOTREACHED();
   return 0;
 }
 
 size_t SubsamplingFactorForBufferFormat(BufferFormat format, size_t plane) {
   switch (format) {
     case BufferFormat::ATC:
     case BufferFormat::ATCIA:
     case BufferFormat::DXT1:
     case BufferFormat::DXT5:
     case BufferFormat::ETC1:
     case BufferFormat::R_8:
+    case BufferFormat::R_16:
     case BufferFormat::RG_88:
     case BufferFormat::BGR_565:
     case BufferFormat::RGBA_4444:
     case BufferFormat::RGBX_8888:
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
     case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 1;
@@ skipping 52 matching lines @@
                                 BufferFormat format,
                                 size_t plane) {
   DCHECK_LT(plane, gfx::NumberOfPlanesForBufferFormat(format));
   switch (format) {
     case BufferFormat::ATC:
     case BufferFormat::ATCIA:
     case BufferFormat::DXT1:
     case BufferFormat::DXT5:
     case BufferFormat::ETC1:
     case BufferFormat::R_8:
+    case BufferFormat::R_16:
     case BufferFormat::RG_88:
     case BufferFormat::BGR_565:
     case BufferFormat::RGBA_4444:
     case BufferFormat::RGBX_8888:
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
     case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 0;
     case BufferFormat::YVU_420: {
       static size_t offset_in_2x2_sub_sampling_sizes[] = {0, 4, 5};
       DCHECK_LT(plane, arraysize(offset_in_2x2_sub_sampling_sizes));
       return offset_in_2x2_sub_sampling_sizes[plane] *
              (size.width() / 2 + size.height() / 2);
     }
     case gfx::BufferFormat::YUV_420_BIPLANAR: {
       static size_t offset_in_2x2_sub_sampling_sizes[] = {0, 4};
       DCHECK_LT(plane, arraysize(offset_in_2x2_sub_sampling_sizes));
       return offset_in_2x2_sub_sampling_sizes[plane] *
              (size.width() / 2 + size.height() / 2);
     }
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace gfx