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// Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_GRAPHICS_2D_H_
#define WEBKIT_GLUE_PLUGINS_PEPPER_GRAPHICS_2D_H_
#include <vector>
#include "base/basictypes.h"
#include "third_party/ppapi/c/pp_completion_callback.h"
#include "third_party/ppapi/c/ppb_graphics_2d.h"
#include "third_party/WebKit/WebKit/chromium/public/WebCanvas.h"
#include "webkit/glue/plugins/pepper_resource.h"
struct PPB_Graphics2D;
namespace gfx {
class Rect;
}
namespace pepper {
class ImageData;
class PluginInstance;
class PluginModule;
class Graphics2D : public Resource {
public:
Graphics2D(PluginModule* module);
virtual ~Graphics2D();
// Returns a pointer to the interface implementing PPB_ImageData that is
// exposed to the plugin.
static const PPB_Graphics2D* GetInterface();
bool Init(int width, int height, bool is_always_opaque);
bool is_always_opaque() const { return is_always_opaque_; }
// Resource override.
virtual Graphics2D* AsGraphics2D() { return this; }
// PPB_Graphics2D functions.
bool Describe(PP_Size* size, bool* is_always_opaque);
bool PaintImageData(PP_Resource image,
const PP_Point* top_left,
const PP_Rect* src_rect);
bool Scroll(const PP_Rect* clip_rect, const PP_Point* amount);
bool ReplaceContents(PP_Resource image);
int32_t Flush(const PP_CompletionCallback& callback);
bool ReadImageData(PP_Resource image, const PP_Point* top_left);
// Assciates this device with the given plugin instance. You can pass NULL to
// clear the existing device. Returns true on success. In this case, a
// repaint of the page will also be scheduled. Failure means that the device
// is already bound to a different instance, and nothing will happen.
bool BindToInstance(PluginInstance* new_instance);
// Paints the current backing store to the web page.
void Paint(WebKit::WebCanvas* canvas,
const gfx::Rect& plugin_rect,
const gfx::Rect& paint_rect);
// Notifications that the view has rendered the page and that it has been
// flushed to the screen. These messages are used to send Flush callbacks to
// the plugin. See
void ViewInitiatedPaint();
void ViewFlushedPaint();
ImageData* image_data() { return image_data_.get(); }
private:
// Tracks a call to flush that requires a callback.
class FlushCallbackData {
public:
FlushCallbackData() {
Clear();
}
FlushCallbackData(const PP_CompletionCallback& callback) {
Set(callback);
}
bool is_null() const { return !callback_.func; }
void Set(const PP_CompletionCallback& callback) {
callback_ = callback;
}
void Clear() {
callback_ = PP_MakeCompletionCallback(NULL, 0);
}
void Execute(int32_t result) {
PP_RunCompletionCallback(&callback_, result);
}
private:
PP_CompletionCallback callback_;
};
// Called internally to execute the different queued commands. The
// parameters to these functions will have already been validated. The last
// rect argument will be filled by each function with the area affected by
// the update that requires invalidation. If there were no pixels changed,
// this rect can be untouched.
void ExecutePaintImageData(ImageData* image,
int x, int y,
const gfx::Rect& src_rect,
gfx::Rect* invalidated_rect);
void ExecuteScroll(const gfx::Rect& clip, int dx, int dy,
gfx::Rect* invalidated_rect);
void ExecuteReplaceContents(ImageData* image,
gfx::Rect* invalidated_rect);
// Schedules the offscreen callback to be fired at a future time. This
// will add the given item to the offscreen_flush_callbacks_ vector.
void ScheduleOffscreenCallback(const FlushCallbackData& callback);
// Function scheduled to execute by ScheduleOffscreenCallback that actually
// issues the offscreen callbacks.
void ExecuteOffscreenCallback(FlushCallbackData data);
// Returns true if there is any type of flush callback pending.
bool HasPendingFlush() const;
scoped_refptr<ImageData> image_data_;
// Non-owning pointer to the plugin instance this context is currently bound
// to, if any. If the context is currently unbound, this will be NULL.
PluginInstance* bound_instance_;
// Keeps track of all drawing commands queued before a Flush call.
struct QueuedOperation;
typedef std::vector<QueuedOperation> OperationQueue;
OperationQueue queued_operations_;
// Indicates whether any changes have been flushed to the backing store.
// This is initially false and is set to true at the first Flush() call.
bool flushed_any_data_;
// The plugin can give us one "Flush" at a time. This flush will either be in
// the "unpainted" state (in which case unpainted_flush_callback_ will be
// non-NULL) or painted, in which case painted_flush_callback_ will be
// non-NULL). There can also be an offscreen callback which is handled
// separately (see offscreen_callback_pending_). Only one of these three
// things may be set at a time to enforce the "only one pending flush at a
// time" constraint.
//
// "Unpainted" ones are flush requests which have never been painted. These
// could have been done while the RenderView was already waiting for an ACK
// from a previous paint, so won't generate a new one yet.
//
// "Painted" ones are those flushes that have been painted by RenderView, but
// for which the ACK from the browser has not yet been received.
//
// When we get updates from a plugin with a callback, it is first added to
// the unpainted callbacks. When the renderer has initiated a paint, we'll
// move it to the painted callbacks list. When the renderer receives a flush,
// we'll execute the callback and remove it from the list.
FlushCallbackData unpainted_flush_callback_;
FlushCallbackData painted_flush_callback_;
// When doing offscreen flushes, we issue a task that issues the callback
// later. This is set when one of those tasks is pending so that we can
// enforce the "only one pending flush at a time" constraint in the API.
bool offscreen_flush_pending_;
// Set to true if the plugin declares that this device will always be opaque.
// This allows us to do more optimized painting in some cases.
bool is_always_opaque_;
DISALLOW_COPY_AND_ASSIGN(Graphics2D);
};
} // namespace pepper
#endif // WEBKIT_GLUE_PLUGINS_PEPPER_GRAPHICS_2D_H_
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