1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/logging.h"
6 #include "third_party/mesa/src/include/GL/osmesa.h"
7 #include "ui/gl/gl_bindings.h"
8 #include "ui/gl/gl_context.h"
9 #include "ui/gl/gl_surface_osmesa.h"
10 #include "ui/gl/scoped_make_current.h"
11
12 namespace gfx {
13
GLSurfaceOSMesa(unsigned format,const gfx::Size & size)14 GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
15 : format_(format),
16 size_(size) {
17 // Implementations of OSMesa surface do not support having a 0 size. In such
18 // cases use a (1, 1) surface.
19 if (size_.GetArea() == 0)
20 size_.SetSize(1, 1);
21 }
22
Initialize()23 bool GLSurfaceOSMesa::Initialize() {
24 return Resize(size_);
25 }
26
Destroy()27 void GLSurfaceOSMesa::Destroy() {
28 buffer_.reset();
29 }
30
Resize(const gfx::Size & new_size)31 bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
32 scoped_ptr<ui::ScopedMakeCurrent> scoped_make_current;
33 GLContext* current_context = GLContext::GetCurrent();
34 bool was_current =
35 current_context && current_context->IsCurrent(this);
36 if (was_current) {
37 scoped_make_current.reset(
38 new ui::ScopedMakeCurrent(current_context, this));
39 current_context->ReleaseCurrent(this);
40 }
41
42 // Preserve the old buffer.
43 scoped_ptr<int32[]> old_buffer(buffer_.release());
44
45 // Allocate a new one.
46 buffer_.reset(new int32[new_size.GetArea()]);
47 memset(buffer_.get(), 0, new_size.GetArea() * sizeof(buffer_[0]));
48
49 // Copy the old back buffer into the new buffer.
50 if (old_buffer.get()) {
51 int copy_width = std::min(size_.width(), new_size.width());
52 int copy_height = std::min(size_.height(), new_size.height());
53 for (int y = 0; y < copy_height; ++y) {
54 for (int x = 0; x < copy_width; ++x) {
55 buffer_[y * new_size.width() + x] = old_buffer[y * size_.width() + x];
56 }
57 }
58 }
59
60 size_ = new_size;
61
62 return true;
63 }
64
IsOffscreen()65 bool GLSurfaceOSMesa::IsOffscreen() {
66 return true;
67 }
68
SwapBuffers()69 bool GLSurfaceOSMesa::SwapBuffers() {
70 NOTREACHED() << "Should not call SwapBuffers on an GLSurfaceOSMesa.";
71 return false;
72 }
73
GetSize()74 gfx::Size GLSurfaceOSMesa::GetSize() {
75 return size_;
76 }
77
GetHandle()78 void* GLSurfaceOSMesa::GetHandle() {
79 return buffer_.get();
80 }
81
GetFormat()82 unsigned GLSurfaceOSMesa::GetFormat() {
83 return format_;
84 }
85
~GLSurfaceOSMesa()86 GLSurfaceOSMesa::~GLSurfaceOSMesa() {
87 Destroy();
88 }
89
IsOffscreen()90 bool GLSurfaceOSMesaHeadless::IsOffscreen() { return false; }
91
SwapBuffers()92 bool GLSurfaceOSMesaHeadless::SwapBuffers() { return true; }
93
GLSurfaceOSMesaHeadless()94 GLSurfaceOSMesaHeadless::GLSurfaceOSMesaHeadless()
95 : GLSurfaceOSMesa(OSMESA_BGRA, gfx::Size(1, 1)) {}
96
~GLSurfaceOSMesaHeadless()97 GLSurfaceOSMesaHeadless::~GLSurfaceOSMesaHeadless() { Destroy(); }
98
99 } // namespace gfx
100