cc/resources/ui_resource_bitmap.h

   1 // Copyright 2013 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 CC_RESOURCES_UI_RESOURCE_BITMAP_H_
   6 #define CC_RESOURCES_UI_RESOURCE_BITMAP_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/base/cc_export.h"
  11 #include "skia/ext/refptr.h"
  12 #include "third_party/skia/include/core/SkPixelRef.h"
  13 #include "ui/gfx/geometry/size.h"
  14
  15 class SkBitmap;
  16
  17 namespace cc {
  18
  19 class ETC1PixelRef;
  20
  21 // A bitmap class that contains a ref-counted reference to a SkPixelRef that
  22 // holds the content of the bitmap (cannot use SkBitmap because of ETC1).
  23 // Thread-safety (by ways of SkPixelRef) ensures that both main and impl threads
  24 // can hold references to the bitmap and that asynchronous uploads are allowed.
  25 class CC_EXPORT UIResourceBitmap {
  26  public:
  27   enum UIResourceFormat {
  28     RGBA8,
  29     ALPHA_8,
  30     ETC1
  31   };
  32   enum UIResourceWrapMode {
  33     CLAMP_TO_EDGE,
  34     REPEAT
  35   };
  36
  37   gfx::Size GetSize() const { return size_; }
  38   UIResourceFormat GetFormat() const { return format_; }
  39   UIResourceWrapMode GetWrapMode() const { return wrap_mode_; }
  40   void SetWrapMode(UIResourceWrapMode wrap_mode) { wrap_mode_ = wrap_mode; }
  41   bool GetOpaque() const { return opaque_; }
  42   void SetOpaque(bool opaque) { opaque_ = opaque; }
  43
  44   // User must ensure that |skbitmap| is immutable.  The SkBitmap Format should
  45   // be 32-bit RGBA or 8-bit ALPHA.
  46   explicit UIResourceBitmap(const SkBitmap& skbitmap);
  47   UIResourceBitmap(const gfx::Size& size, bool is_opaque);
  48   UIResourceBitmap(const skia::RefPtr<SkPixelRef>& pixel_ref,
  49                    const gfx::Size& size);
  50   ~UIResourceBitmap();
  51
  52  private:
  53   friend class AutoLockUIResourceBitmap;
  54
  55   void Create(const skia::RefPtr<SkPixelRef>& pixel_ref,
  56               const gfx::Size& size,
  57               UIResourceFormat format);
  58
  59   skia::RefPtr<SkPixelRef> pixel_ref_;
  60   UIResourceFormat format_;
  61   UIResourceWrapMode wrap_mode_;
  62   gfx::Size size_;
  63   bool opaque_;
  64 };
  65
  66 class CC_EXPORT AutoLockUIResourceBitmap {
  67  public:
  68   explicit AutoLockUIResourceBitmap(const UIResourceBitmap& bitmap);
  69   ~AutoLockUIResourceBitmap();
  70   const uint8_t* GetPixels() const;
  71
  72  private:
  73   const UIResourceBitmap& bitmap_;
  74 };
  75
  76 }  // namespace cc
  77
  78 #endif  // CC_RESOURCES_UI_RESOURCE_BITMAP_H_