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      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 CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "build/build_config.h"
     13 #include "content/browser/renderer_host/backing_store.h"
     14 #include "content/common/content_export.h"
     15 #include "ui/gfx/x/x11_types.h"
     16 
     17 namespace gfx {
     18 class Point;
     19 class Rect;
     20 }
     21 
     22 typedef struct _GdkDrawable GdkDrawable;
     23 
     24 namespace content {
     25 
     26 class CONTENT_EXPORT BackingStoreGtk : public BackingStore {
     27  public:
     28   // Create a backing store on the X server. The visual is an Xlib Visual
     29   // describing the format of the target window and the depth is the color
     30   // depth of the X window which will be drawn into.
     31   BackingStoreGtk(RenderWidgetHost* widget,
     32                   const gfx::Size& size,
     33                   void* visual,
     34                   int depth);
     35 
     36   // This is for unittesting only. An object constructed using this constructor
     37   // will silently ignore all paints
     38   BackingStoreGtk(RenderWidgetHost* widget, const gfx::Size& size);
     39 
     40   virtual ~BackingStoreGtk();
     41 
     42   XDisplay* display() const { return display_; }
     43   XID root_window() const { return root_window_; }
     44 
     45   // Copy from the server-side backing store to the target window
     46   //   origin: the destination rectangle origin
     47   //   damage: the area to copy
     48   //   target: the X id of the target window
     49   void XShowRect(const gfx::Point &origin, const gfx::Rect& damage,
     50                  XID target);
     51 
     52 #if defined(TOOLKIT_GTK)
     53   // Paint the backing store into the target's |dest_rect|.
     54   void PaintToRect(const gfx::Rect& dest_rect, GdkDrawable* target);
     55 #endif
     56 
     57   // BackingStore implementation.
     58   virtual size_t MemorySize() OVERRIDE;
     59   virtual void PaintToBackingStore(
     60       RenderProcessHost* process,
     61       TransportDIB::Id bitmap,
     62       const gfx::Rect& bitmap_rect,
     63       const std::vector<gfx::Rect>& copy_rects,
     64       float scale_factor,
     65       const base::Closure& completion_callback,
     66       bool* scheduled_completion_callback) OVERRIDE;
     67   virtual bool CopyFromBackingStore(const gfx::Rect& rect,
     68                                     skia::PlatformBitmap* output) OVERRIDE;
     69   virtual void ScrollBackingStore(const gfx::Vector2d& delta,
     70                                   const gfx::Rect& clip_rect,
     71                                   const gfx::Size& view_size) OVERRIDE;
     72 
     73  private:
     74   // Paints the bitmap from the renderer onto the backing store without
     75   // using Xrender to composite the pixmaps.
     76   void PaintRectWithoutXrender(TransportDIB* bitmap,
     77                                const gfx::Rect& bitmap_rect,
     78                                const std::vector<gfx::Rect>& copy_rects);
     79 
     80   // This is the connection to the X server where this backing store will be
     81   // displayed.
     82   XDisplay* const display_;
     83   // What flavor, if any, MIT-SHM (X shared memory) support we have.
     84   const ui::SharedMemorySupport shared_memory_support_;
     85   // If this is true, then we can use Xrender to composite our pixmaps.
     86   const bool use_render_;
     87   // If |use_render_| is false, this is the number of bits-per-pixel for |depth|
     88   int pixmap_bpp_;
     89   // if |use_render_| is false, we need the Visual to get the RGB masks.
     90   void* const visual_;
     91   // This is the depth of the target window.
     92   const int visual_depth_;
     93   // The parent window (probably a GtkDrawingArea) for this backing store.
     94   const XID root_window_;
     95   // This is a handle to the server side pixmap which is our backing store.
     96   XID pixmap_;
     97   // This is the RENDER picture pointing at |pixmap_|.
     98   XID picture_;
     99   // This is a default graphic context, used in XCopyArea
    100   void* pixmap_gc_;
    101 
    102   DISALLOW_COPY_AND_ASSIGN(BackingStoreGtk);
    103 };
    104 
    105 }  // namespace content
    106 
    107 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
    108