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      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_
     80