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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 "base/numerics/safe_math.h"
#include "third_party/mesa/src/include/GL/osmesa.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_surface_osmesa.h"
#include "ui/gl/scoped_make_current.h"
namespace gfx {
GLSurfaceOSMesa::GLSurfaceOSMesa(OSMesaSurfaceFormat format,
const gfx::Size& size)
: size_(size) {
switch (format) {
case OSMesaSurfaceFormatBGRA:
format_ = OSMESA_BGRA;
break;
case OSMesaSurfaceFormatRGBA:
format_ = OSMESA_RGBA;
break;
}
// Implementations of OSMesa surface do not support having a 0 size. In such
// cases use a (1, 1) surface.
if (size_.GetArea() == 0)
size_.SetSize(1, 1);
}
bool GLSurfaceOSMesa::Initialize() {
return Resize(size_);
}
void GLSurfaceOSMesa::Destroy() {
buffer_.reset();
}
bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
scoped_ptr<ui::ScopedMakeCurrent> scoped_make_current;
GLContext* current_context = GLContext::GetCurrent();
bool was_current =
current_context && current_context->IsCurrent(this);
if (was_current) {
scoped_make_current.reset(
new ui::ScopedMakeCurrent(current_context, this));
current_context->ReleaseCurrent(this);
}
// Preserve the old buffer.
scoped_ptr<int32[]> old_buffer(buffer_.release());
base::CheckedNumeric<int> checked_size = sizeof(buffer_[0]);
checked_size *= new_size.width();
checked_size *= new_size.height();
if (!checked_size.IsValid())
return false;
// Allocate a new one.
buffer_.reset(new int32[new_size.GetArea()]);
if (!buffer_.get())
return false;
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;
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();
}
bool GLSurfaceOSMesaHeadless::IsOffscreen() { return false; }
bool GLSurfaceOSMesaHeadless::SwapBuffers() { return true; }
GLSurfaceOSMesaHeadless::GLSurfaceOSMesaHeadless()
: GLSurfaceOSMesa(OSMesaSurfaceFormatBGRA, gfx::Size(1, 1)) {
}
GLSurfaceOSMesaHeadless::~GLSurfaceOSMesaHeadless() { Destroy(); }
} // namespace gfx
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