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// 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 "ui/gl/gl_bindings.h"
namespace content {
GpuMemoryBufferImpl::GpuMemoryBufferImpl(
scoped_ptr<base::SharedMemory> shared_memory,
size_t width,
size_t height,
unsigned internalformat)
: shared_memory_(shared_memory.Pass()),
size_(gfx::Size(width, height)),
internalformat_(internalformat),
mapped_(false) {
DCHECK(!shared_memory_->memory());
DCHECK(IsFormatValid(internalformat));
}
GpuMemoryBufferImpl::~GpuMemoryBufferImpl() {
}
void GpuMemoryBufferImpl::Map(AccessMode mode, void** vaddr) {
DCHECK(!mapped_);
*vaddr = NULL;
if (!shared_memory_->Map(size_.GetArea() * BytesPerPixel(internalformat_)))
return;
*vaddr = shared_memory_->memory();
mapped_ = true;
}
void GpuMemoryBufferImpl::Unmap() {
DCHECK(mapped_);
shared_memory_->Unmap();
mapped_ = false;
}
bool GpuMemoryBufferImpl::IsMapped() const {
return mapped_;
}
uint32 GpuMemoryBufferImpl::GetStride() const {
return size_.width() * BytesPerPixel(internalformat_);
}
gfx::GpuMemoryBufferHandle GpuMemoryBufferImpl::GetHandle() const {
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.handle = shared_memory_->handle();
return handle;
}
// static
bool GpuMemoryBufferImpl::IsFormatValid(unsigned internalformat) {
// GL_RGBA8_OES is the only supported format at the moment.
switch (internalformat) {
case GL_RGBA8_OES:
return true;
default:
return false;
}
}
// static
size_t GpuMemoryBufferImpl::BytesPerPixel(unsigned internalformat) {
// GL_RGBA_OES has 4 bytes per pixel.
switch (internalformat) {
case GL_RGBA8_OES:
return 4;
default:
NOTREACHED();
return 0;
}
}
} // namespace content
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