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// Copyright (c) 2012 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 "base/logging.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_surface_osmesa.h"
namespace gfx {
GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
: format_(format),
size_(size) {
}
bool GLSurfaceOSMesa::Initialize() {
return Resize(size_);
}
void GLSurfaceOSMesa::Destroy() {
buffer_.reset();
}
bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
GLContext* current_context = GLContext::GetCurrent();
bool was_current = current_context && current_context->IsCurrent(this);
if (was_current)
current_context->ReleaseCurrent(this);
// Preserve the old buffer.
scoped_array<int32> old_buffer(buffer_.release());
// Allocate a new one.
buffer_.reset(new int32[new_size.GetArea()]);
memset(buffer_.get(), 0, new_size.GetArea() * sizeof(buffer_[0]));
// Copy the old back buffer into the new buffer.
if (old_buffer.get()) {
int copy_width = std::min(size_.width(), new_size.width());
int copy_height = std::min(size_.height(), new_size.height());
for (int y = 0; y < copy_height; ++y) {
for (int x = 0; x < copy_width; ++x) {
buffer_[y * new_size.width() + x] = old_buffer[y * size_.width() + x];
}
}
}
size_ = new_size;
if (was_current)
return current_context->MakeCurrent(this);
return true;
}
bool GLSurfaceOSMesa::IsOffscreen() {
return true;
}
bool GLSurfaceOSMesa::SwapBuffers() {
NOTREACHED() << "Should not call SwapBuffers on an GLSurfaceOSMesa.";
return false;
}
gfx::Size GLSurfaceOSMesa::GetSize() {
return size_;
}
void* GLSurfaceOSMesa::GetHandle() {
return buffer_.get();
}
unsigned GLSurfaceOSMesa::GetFormat() {
return format_;
}
GLSurfaceOSMesa::~GLSurfaceOSMesa() {
Destroy();
}
} // namespace gfx
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