ui/ozone/platform/drm/gpu/drm_buffer.h

   1 // Copyright 2014 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_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
   6 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
   7
   8 #include "base/macros.h"
   9 #include "skia/ext/refptr.h"
  10 #include "third_party/skia/include/core/SkSurface.h"
  11 #include "ui/ozone/ozone_export.h"
  12 #include "ui/ozone/platform/drm/gpu/scanout_buffer.h"
  13
  14 namespace ui {
  15
  16 class DrmDevice;
  17
  18 // Wrapper for a DRM allocated buffer. Keeps track of the native properties of
  19 // the buffer and wraps the pixel memory into a SkSurface which can be used to
  20 // draw into using Skia.
  21 class OZONE_EXPORT DrmBuffer : public ScanoutBuffer {
  22  public:
  23   DrmBuffer(const scoped_refptr<DrmDevice>& drm);
  24
  25   // Allocates the backing pixels and wraps them in |surface_|. |info| is used
  26   // to describe the buffer characteristics (size, color format).
  27   // |should_register_framebuffer| is used to distinguish the buffers that are
  28   // used for modesetting.
  29   bool Initialize(const SkImageInfo& info, bool should_register_framebuffer);
  30
  31   SkCanvas* GetCanvas() const;
  32
  33   // ScanoutBuffer:
  34   uint32_t GetFramebufferId() const override;
  35   uint32_t GetHandle() const override;
  36   gfx::Size GetSize() const override;
  37
  38  protected:
  39   ~DrmBuffer() override;
  40
  41   scoped_refptr<DrmDevice> drm_;
  42
  43   // Wrapper around the native pixel memory.
  44   skia::RefPtr<SkSurface> surface_;
  45
  46   // Length of a row of pixels.
  47   uint32_t stride_;
  48
  49   // Buffer handle used by the DRM allocator.
  50   uint32_t handle_;
  51
  52   // Buffer ID used by the DRM modesettings API. This is set when the buffer is
  53   // registered with the CRTC.
  54   uint32_t framebuffer_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(DrmBuffer);
  57 };
  58
  59 class OZONE_EXPORT DrmBufferGenerator : public ScanoutBufferGenerator {
  60  public:
  61   DrmBufferGenerator();
  62   ~DrmBufferGenerator() override;
  63
  64   // ScanoutBufferGenerator:
  65   scoped_refptr<ScanoutBuffer> Create(const scoped_refptr<DrmDevice>& drm,
  66                                       const gfx::Size& size) override;
  67
  68  private:
  69   DISALLOW_COPY_AND_ASSIGN(DrmBufferGenerator);
  70 };
  71
  72 }  // namespace ui
  73
  74 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_