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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
#define UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
#include <utility>
#include "base/component_export.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_source.h"
namespace gfx {
class Canvas;
class ImageSkiaRep;
class Insets;
// CanvasImageSource is useful if you need to generate an image for a scale
// factor using Canvas. It creates a new Canvas with target scale factor and
// generates ImageSkiaRep when drawing is completed.
class COMPONENT_EXPORT(GFX) CanvasImageSource : public ImageSkiaSource {
public:
// Factory function to create an ImageSkia from a CanvasImageSource. Example:
// ImageSkia my_image =
// CanvasImageSource::MakeImageSkia<MySource>(param1, param2);
template <typename T, typename... Args>
static ImageSkia MakeImageSkia(Args&&... args) {
auto source = std::make_unique<T>(std::forward<Args>(args)...);
Size size = source->size();
return ImageSkia(std::move(source), size);
}
// Creates a Image containing |image| with transparent padding around the
// edges as specified by |insets|.
static ImageSkia CreatePadded(const ImageSkia& image, const Insets& insets);
explicit CanvasImageSource(const Size& size);
CanvasImageSource(const CanvasImageSource&) = delete;
CanvasImageSource& operator=(const CanvasImageSource&) = delete;
~CanvasImageSource() override {}
// Called when a new image needs to be drawn for a scale factor.
virtual void Draw(Canvas* canvas) = 0;
// Returns the size of images in DIP that this source will generate.
const Size& size() const { return size_; }
// Overridden from ImageSkiaSource.
ImageSkiaRep GetImageForScale(float scale) override;
protected:
const Size size_;
};
} // namespace gfx
#endif // UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
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