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