Implement the texture uploading of ASTC compression for WebGL

content/common/gpu/client/gpu_memory_buffer_impl.cc

 // Copyright 2013 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 "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h"
 #include "ui/gl/gl_bindings.h"
@@ skipping 64 matching lines @@
 // static
 GpuMemoryBufferImpl* GpuMemoryBufferImpl::FromClientBuffer(
     ClientBuffer buffer) {
   return reinterpret_cast<GpuMemoryBufferImpl*>(buffer);
 }
 
 // static
 size_t GpuMemoryBufferImpl::NumberOfPlanesForGpuMemoryBufferFormat(
     Format format) {
   switch (format) {
+    case ASTC:
     case ATC:
     case ATCIA:
     case DXT1:
     case DXT5:
     case ETC1:
     case R_8:
     case RGBA_4444:
     case RGBA_8888:
     case RGBX_8888:
     case BGRA_8888:
       return 1;
     case YUV_420:
       return 3;
   }
   NOTREACHED();
   return 0;
 }
 
 // static
 size_t GpuMemoryBufferImpl::SubsamplingFactor(Format format, int plane) {
   switch (format) {
+    case ASTC:
     case ATC:
     case ATCIA:
     case DXT1:
     case DXT5:
     case ETC1:
     case R_8:
     case RGBA_4444:
     case RGBA_8888:
     case RGBX_8888:
     case BGRA_8888:
@@ skipping 13 matching lines @@
                                          Format format,
                                          int plane,
                                          size_t* size_in_bytes) {
   base::CheckedNumeric<size_t> checked_size = width;
   switch (format) {
     case ATCIA:
     case DXT5:
       DCHECK_EQ(plane, 0);
       *size_in_bytes = width;
       return true;
+    case ASTC:
     case ATC:
     case DXT1:
     case ETC1:
       DCHECK_EQ(plane, 0);
       DCHECK_EQ(width % 2, 0u);
       *size_in_bytes = width / 2;

[piman, 2015/08/17 23:00:20]

For ASTC (4x4), you need width%4 == 0, and size_in_bytes will be width/4, since
it uses 16 bytes for 16 pixels.

       return true;
     case R_8:
       checked_size += 3;
       if (!checked_size.IsValid())
         return false;
       *size_in_bytes = checked_size.ValueOrDie() & ~0x3;
       return true;
     case RGBA_4444:
       checked_size *= 2;
       if (!checked_size.IsValid())
@@ skipping 48 matching lines @@
 
 gfx::GpuMemoryBufferId GpuMemoryBufferImpl::GetId() const {
   return id_;
 }
 
 ClientBuffer GpuMemoryBufferImpl::AsClientBuffer() {
   return reinterpret_cast<ClientBuffer>(this);
 }
 
 }  // namespace content