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// Copyright (c) 2011 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 UI_GFX_CANVAS_PAINT_LINUX_H_
#define UI_GFX_CANVAS_PAINT_LINUX_H_
#include "base/logging.h"
#include "skia/ext/platform_canvas.h"
#include "ui/gfx/canvas.h"
#include <gdk/gdk.h>
namespace gfx {
// A class designed to translate skia painting into a region in a GdkWindow.
// On construction, it will set up a context for painting into, and on
// destruction, it will commit it to the GdkWindow.
// Note: The created context is always inialized to (0, 0, 0, 0).
class CanvasSkiaPaint : public Canvas {
public:
// This constructor assumes the result is opaque.
explicit CanvasSkiaPaint(GdkEventExpose* event);
CanvasSkiaPaint(GdkEventExpose* event, bool opaque);
virtual ~CanvasSkiaPaint();
// Sets whether the bitmap is composited in such a way that the alpha channel
// is honored. This is only useful if you've enabled an RGBA colormap on the
// widget. The default is false.
void set_composite_alpha(bool composite_alpha) {
composite_alpha_ = composite_alpha;
}
// Returns true if the invalid region is empty. The caller should call this
// function to determine if anything needs painting.
bool is_empty() const {
return gdk_region_empty(region_);
}
GdkRectangle rectangle() const {
GdkRectangle bounds;
gdk_region_get_clipbox(region_, &bounds);
return bounds;
}
private:
void Init(bool opaque);
cairo_t* context_;
GdkWindow* window_;
GdkRegion* region_;
// See description above setter.
bool composite_alpha_;
// Disallow copy and assign.
CanvasSkiaPaint(const CanvasSkiaPaint&);
CanvasSkiaPaint& operator=(const CanvasSkiaPaint&);
};
} // namespace gfx
#endif // UI_GFX_CANVAS_PAINT_LINUX_H_
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