ui/gl/gl_surface_osmesa.h

   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 #ifndef UI_GL_GL_SURFACE_OSMESA_H_
   6 #define UI_GL_GL_SURFACE_OSMESA_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "ui/gfx/geometry/size.h"
  10 #include "ui/gl/gl_surface.h"
  11
  12 namespace gfx {
  13
  14 enum OSMesaSurfaceFormat { OSMesaSurfaceFormatBGRA, OSMesaSurfaceFormatRGBA };
  15
  16 // A surface that the Mesa software renderer draws to. This is actually just a
  17 // buffer in system memory. GetHandle returns a pointer to the buffer. These
  18 // surfaces can be resized and resizing preserves the contents.
  19 class GL_EXPORT GLSurfaceOSMesa : public GLSurface {
  20  public:
  21   GLSurfaceOSMesa(OSMesaSurfaceFormat format, const gfx::Size& size);
  22
  23   // Implement GLSurface.
  24   bool Initialize() override;
  25   void Destroy() override;
  26   bool Resize(const gfx::Size& new_size) override;
  27   bool IsOffscreen() override;
  28   bool SwapBuffers() override;
  29   gfx::Size GetSize() override;
  30   void* GetHandle() override;
  31   unsigned GetFormat() override;
  32
  33  protected:
  34   ~GLSurfaceOSMesa() override;
  35
  36  private:
  37   unsigned format_;
  38   gfx::Size size_;
  39   scoped_ptr<int32[]> buffer_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesa);
  42 };
  43
  44 // A thin subclass of |GLSurfaceOSMesa| that can be used in place
  45 // of a native hardware-provided surface when a native surface
  46 // provider is not available.
  47 class GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
  48  public:
  49   explicit GLSurfaceOSMesaHeadless();
  50
  51   bool IsOffscreen() override;
  52   bool SwapBuffers() override;
  53
  54  protected:
  55   ~GLSurfaceOSMesaHeadless() override;
  56
  57  private:
  58   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesaHeadless);
  59 };
  60
  61 }  // namespace gfx
  62
  63 #endif  // UI_GL_GL_SURFACE_OSMESA_H_