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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_RENDERER_RENDER_PROCESS_H__
#define CHROME_RENDERER_RENDER_PROCESS_H__
#include "base/timer.h"
#include "chrome/common/child_process.h"
#include "chrome/renderer/render_thread.h"
#include "skia/ext/platform_canvas.h"
namespace gfx {
class Rect;
}
class TransportDIB;
// Represents the renderer end of the browser<->renderer connection. The
// opposite end is the RenderProcessHost. This is a singleton object for
// each renderer.
class RenderProcess : public ChildProcess {
public:
RenderProcess();
~RenderProcess();
// Get a canvas suitable for drawing and transporting to the browser
// memory: (output) the transport DIB memory
// rect: the rectangle which will be painted, use for sizing the canvas
// returns: NULL on error
//
// When no longer needed, you should pass the TransportDIB to
// ReleaseTransportDIB so that it can be recycled.
skia::PlatformCanvas* GetDrawingCanvas(
TransportDIB** memory, const gfx::Rect& rect);
// Frees shared memory allocated by AllocSharedMemory. You should only use
// this function to free the SharedMemory object.
void ReleaseTransportDIB(TransportDIB* memory);
// Returns true if plugins should be loaded in-process.
bool in_process_plugins() const { return in_process_plugins_; }
bool initialized_media_library() const { return initialized_media_library_; }
// Returns a pointer to the RenderProcess singleton instance.
static RenderProcess* current() {
return static_cast<RenderProcess*>(ChildProcess::current());
}
// Just like in_process_plugins(), but called before RenderProcess is created.
static bool InProcessPlugins();
private:
// Look in the shared memory cache for a suitable object to reuse.
// result: (output) the memory found
// size: the resulting memory will be >= this size, in bytes
// returns: false if a suitable DIB memory could not be found
bool GetTransportDIBFromCache(TransportDIB** result, size_t size);
// Maybe put the given shared memory into the shared memory cache. Returns
// true if the SharedMemory object was stored in the cache; otherwise, false
// is returned.
bool PutSharedMemInCache(TransportDIB* memory);
void ClearTransportDIBCache();
// Return the index of a free cache slot in which to install a transport DIB
// of the given size. If all entries in the cache are larger than the given
// size, this doesn't free any slots and returns -1.
int FindFreeCacheSlot(size_t size);
// Create a new transport DIB of, at least, the given size. Return NULL on
// error.
TransportDIB* CreateTransportDIB(size_t size);
void FreeTransportDIB(TransportDIB*);
// A very simplistic and small cache. If an entry in this array is non-null,
// then it points to a SharedMemory object that is available for reuse.
TransportDIB* shared_mem_cache_[2];
// This DelayTimer cleans up our cache 5 seconds after the last use.
base::DelayTimer<RenderProcess> shared_mem_cache_cleaner_;
// TransportDIB sequence number
uint32 sequence_number_;
bool in_process_plugins_;
bool initialized_media_library_;
DISALLOW_COPY_AND_ASSIGN(RenderProcess);
};
#endif // CHROME_RENDERER_RENDER_PROCESS_H__
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