ui/gl/gl_surface_osmesa.cc

   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 "ui/gl/gl_bindings.h"
   7 #include "ui/gl/gl_context.h"
   8 #include "ui/gl/gl_surface_osmesa.h"
   9
  10 namespace gfx {
  11
  12 GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
  13     : format_(format),
  14       size_(size) {
  15 }
  16
  17 bool GLSurfaceOSMesa::Initialize() {
  18   return Resize(size_);
  19 }
  20
  21 void GLSurfaceOSMesa::Destroy() {
  22   buffer_.reset();
  23 }
  24
  25 bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
  26   GLContext* current_context = GLContext::GetCurrent();
  27   bool was_current = current_context && current_context->IsCurrent(this);
  28   if (was_current)
  29     current_context->ReleaseCurrent(this);
  30
  31   // Preserve the old buffer.
  32   scoped_ptr<int32[]> old_buffer(buffer_.release());
  33
  34   // Allocate a new one.
  35   buffer_.reset(new int32[new_size.GetArea()]);
  36   memset(buffer_.get(), 0, new_size.GetArea() * sizeof(buffer_[0]));
  37
  38   // Copy the old back buffer into the new buffer.
  39   if (old_buffer.get()) {
  40     int copy_width = std::min(size_.width(), new_size.width());
  41     int copy_height = std::min(size_.height(), new_size.height());
  42     for (int y = 0; y < copy_height; ++y) {
  43       for (int x = 0; x < copy_width; ++x) {
  44         buffer_[y * new_size.width() + x] = old_buffer[y * size_.width() + x];
  45       }
  46     }
  47   }
  48
  49   size_ = new_size;
  50
  51   if (was_current)
  52     return current_context->MakeCurrent(this);
  53
  54   return true;
  55 }
  56
  57 bool GLSurfaceOSMesa::IsOffscreen() {
  58   return true;
  59 }
  60
  61 bool GLSurfaceOSMesa::SwapBuffers() {
  62   NOTREACHED() << "Should not call SwapBuffers on an GLSurfaceOSMesa.";
  63   return false;
  64 }
  65
  66 gfx::Size GLSurfaceOSMesa::GetSize() {
  67   return size_;
  68 }
  69
  70 void* GLSurfaceOSMesa::GetHandle() {
  71   return buffer_.get();
  72 }
  73
  74 unsigned GLSurfaceOSMesa::GetFormat() {
  75   return format_;
  76 }
  77
  78 GLSurfaceOSMesa::~GLSurfaceOSMesa() {
  79   Destroy();
  80 }
  81
  82 }  // namespace gfx