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      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 
     14 GLSurfaceOSMesa::GLSurfaceOSMesa(OSMesaSurfaceFormat format,
     15                                  const gfx::Size& size)
     16     : size_(size) {
     17   switch (format) {
     18     case OSMesaSurfaceFormatBGRA:
     19       format_ = OSMESA_BGRA;
     20       break;
     21     case OSMesaSurfaceFormatRGBA:
     22       format_ = OSMESA_RGBA;
     23       break;
     24   }
     25   // Implementations of OSMesa surface do not support having a 0 size. In such
     26   // cases use a (1, 1) surface.
     27   if (size_.GetArea() == 0)
     28     size_.SetSize(1, 1);
     29 }
     30 
     31 bool GLSurfaceOSMesa::Initialize() {
     32   return Resize(size_);
     33 }
     34 
     35 void GLSurfaceOSMesa::Destroy() {
     36   buffer_.reset();
     37 }
     38 
     39 bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
     40   scoped_ptr<ui::ScopedMakeCurrent> scoped_make_current;
     41   GLContext* current_context = GLContext::GetCurrent();
     42   bool was_current =
     43       current_context && current_context->IsCurrent(this);
     44   if (was_current) {
     45     scoped_make_current.reset(
     46         new ui::ScopedMakeCurrent(current_context, this));
     47     current_context->ReleaseCurrent(this);
     48   }
     49 
     50   // Preserve the old buffer.
     51   scoped_ptr<int32[]> old_buffer(buffer_.release());
     52 
     53   // Allocate a new one.
     54   buffer_.reset(new int32[new_size.GetArea()]);
     55   memset(buffer_.get(), 0, new_size.GetArea() * sizeof(buffer_[0]));
     56 
     57   // Copy the old back buffer into the new buffer.
     58   if (old_buffer.get()) {
     59     int copy_width = std::min(size_.width(), new_size.width());
     60     int copy_height = std::min(size_.height(), new_size.height());
     61     for (int y = 0; y < copy_height; ++y) {
     62       for (int x = 0; x < copy_width; ++x) {
     63         buffer_[y * new_size.width() + x] = old_buffer[y * size_.width() + x];
     64       }
     65     }
     66   }
     67 
     68   size_ = new_size;
     69 
     70   return true;
     71 }
     72 
     73 bool GLSurfaceOSMesa::IsOffscreen() {
     74   return true;
     75 }
     76 
     77 bool GLSurfaceOSMesa::SwapBuffers() {
     78   NOTREACHED() << "Should not call SwapBuffers on an GLSurfaceOSMesa.";
     79   return false;
     80 }
     81 
     82 gfx::Size GLSurfaceOSMesa::GetSize() {
     83   return size_;
     84 }
     85 
     86 void* GLSurfaceOSMesa::GetHandle() {
     87   return buffer_.get();
     88 }
     89 
     90 unsigned GLSurfaceOSMesa::GetFormat() {
     91   return format_;
     92 }
     93 
     94 GLSurfaceOSMesa::~GLSurfaceOSMesa() {
     95   Destroy();
     96 }
     97 
     98 bool GLSurfaceOSMesaHeadless::IsOffscreen() { return false; }
     99 
    100 bool GLSurfaceOSMesaHeadless::SwapBuffers() { return true; }
    101 
    102 GLSurfaceOSMesaHeadless::GLSurfaceOSMesaHeadless()
    103     : GLSurfaceOSMesa(OSMesaSurfaceFormatBGRA, gfx::Size(1, 1)) {
    104 }
    105 
    106 GLSurfaceOSMesaHeadless::~GLSurfaceOSMesaHeadless() { Destroy(); }
    107 
    108 }  // namespace gfx
    109