8c8d53777f
This patch re-arranges nitpicker's graphics backend in a more modular and expandable way. Generalized versions of the 'Canvas', 'Chunky_canvas', and 'Pixel_*' classes have been moved to 'os/include/util/' and 'os/include/os'. The only remaining parts that are specific to nitpicker's needs are a few drawing functions, each located in a distinct header at 'os/include/nitpicker_gfx/'.
103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
/*
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* \brief Graphics backend used by nitpicker
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* \author Norman Feske
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* \date 2013-12-29
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*/
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/*
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* Copyright (C) 2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _CANVAS_H_
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#define _CANVAS_H_
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#include <nitpicker_gfx/box_painter.h>
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#include <nitpicker_gfx/text_painter.h>
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#include <nitpicker_gfx/texture_painter.h>
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typedef Genode::Surface_base::Area Area;
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typedef Genode::Surface_base::Point Point;
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typedef Genode::Surface_base::Rect Rect;
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typedef Genode::Color Color;
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using Genode::Texture_base;
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using Genode::Texture;
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/**
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* Pixel-type-independent interface of nitpicker's graphics backend
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*/
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struct Canvas_base
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{
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virtual Area size() const = 0;
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virtual Rect clip() const = 0;
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virtual void clip(Rect) = 0;
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virtual void flush_pixels(Rect) = 0;
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virtual void draw_box(Rect, Color) = 0;
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virtual void draw_texture(Point, Texture_base const &, Texture_painter::Mode,
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Color mix_color, bool allow_alpha) = 0;
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virtual void draw_text(Point, Text_painter::Font const &, Color,
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char const *string) = 0;
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};
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/**
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* Pixel-type-specific implementation of nitpicker's graphics backend
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*/
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template <typename PT>
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class Canvas : public Canvas_base, public Genode::Surface_base::Flusher
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{
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private:
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Genode::Surface<PT> _surface;
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public:
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Canvas(PT *base, Area size) : _surface(base, size)
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{
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_surface.flusher(this);
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}
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/**
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* Default implementation of Surface_base::Flusher interface
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*/
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void flush_pixels(Rect) { }
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Area size() const { return _surface.size(); }
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Rect clip() const { return _surface.clip(); }
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void clip(Rect rect) { _surface.clip(rect); }
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void draw_box(Rect rect, Color color)
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{
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Box_painter::paint(_surface, rect, color);
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}
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void draw_texture(Point pos, Texture_base const &texture_base,
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Texture_painter::Mode mode, Color mix_color,
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bool allow_alpha)
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{
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Texture<PT> const &texture = static_cast<Texture<PT> const &>(texture_base);
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Texture_painter::paint(_surface, texture, mix_color, pos, mode,
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allow_alpha);
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}
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void draw_text(Point pos, Text_painter::Font const &font,
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Color color, char const *string)
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{
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Text_painter::paint(_surface, pos, font, color, string);
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}
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};
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#endif /* _CANVAS_H_ */
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