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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 "ui/gl/gl_image_shm.h"
#include "base/debug/trace_event.h"
#include "base/process/process_handle.h"
#include "ui/gl/gl_bindings.h"
namespace gfx {
namespace {
bool ValidFormat(unsigned internalformat) {
switch (internalformat) {
case GL_BGRA8_EXT:
case GL_RGBA8_OES:
return true;
default:
return false;
}
}
GLenum TextureFormat(unsigned internalformat) {
switch (internalformat) {
case GL_BGRA8_EXT:
return GL_BGRA_EXT;
case GL_RGBA8_OES:
return GL_RGBA;
default:
NOTREACHED();
return 0;
}
}
GLenum DataFormat(unsigned internalformat) {
return TextureFormat(internalformat);
}
GLenum DataType(unsigned internalformat) {
switch (internalformat) {
case GL_BGRA8_EXT:
case GL_RGBA8_OES:
return GL_UNSIGNED_BYTE;
default:
NOTREACHED();
return 0;
}
}
GLenum BytesPerPixel(unsigned internalformat) {
switch (internalformat) {
case GL_BGRA8_EXT:
case GL_RGBA8_OES:
return 4;
default:
NOTREACHED();
return 0;
}
}
} // namespace
GLImageShm::GLImageShm(gfx::Size size, unsigned internalformat)
: size_(size),
internalformat_(internalformat) {
}
GLImageShm::~GLImageShm() {
Destroy();
}
bool GLImageShm::Initialize(gfx::GpuMemoryBufferHandle buffer) {
if (!ValidFormat(internalformat_)) {
DVLOG(0) << "Invalid format: " << internalformat_;
return false;
}
if (!base::SharedMemory::IsHandleValid(buffer.handle))
return false;
base::SharedMemory shared_memory(buffer.handle, true);
// Duplicate the handle.
base::SharedMemoryHandle duped_shared_memory_handle;
if (!shared_memory.ShareToProcess(base::GetCurrentProcessHandle(),
&duped_shared_memory_handle)) {
DVLOG(0) << "Failed to duplicate shared memory handle.";
return false;
}
shared_memory_.reset(
new base::SharedMemory(duped_shared_memory_handle, true));
return true;
}
void GLImageShm::Destroy() {
}
gfx::Size GLImageShm::GetSize() {
return size_;
}
bool GLImageShm::BindTexImage(unsigned target) {
TRACE_EVENT0("gpu", "GLImageShm::BindTexImage");
DCHECK(shared_memory_);
DCHECK(ValidFormat(internalformat_));
size_t size = size_.GetArea() * BytesPerPixel(internalformat_);
DCHECK(!shared_memory_->memory());
if (!shared_memory_->Map(size)) {
DVLOG(0) << "Failed to map shared memory.";
return false;
}
DCHECK(shared_memory_->memory());
glTexImage2D(target,
0, // mip level
TextureFormat(internalformat_),
size_.width(),
size_.height(),
0, // border
DataFormat(internalformat_),
DataType(internalformat_),
shared_memory_->memory());
shared_memory_->Unmap();
return true;
}
void GLImageShm::ReleaseTexImage(unsigned target) {
}
void GLImageShm::WillUseTexImage() {
}
void GLImageShm::DidUseTexImage() {
}
} // namespace gfx
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