102 lines
1.9 KiB
C
102 lines
1.9 KiB
C
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/*
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* \brief Graphics back end for example window decorator
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* \author Norman Feske
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* \date 2014-01-10
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*/
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/*
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* Copyright (C) 2014 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 <decorator/types.h>
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namespace Decorator {
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typedef Text_painter::Font Font;
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Font &default_font();
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template <typename PT> class Canvas;
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class Clip_guard;
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}
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#define FONT_START_SYMBOL _binary_droidsansb10_tff_start
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extern char FONT_START_SYMBOL;
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/**
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* Return default font
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*/
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Decorator::Font &Decorator::default_font()
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{
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static Font font(&FONT_START_SYMBOL);
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return font;
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}
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/**
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* Abstract interface of graphics back end
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*/
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struct Decorator::Canvas_base
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{
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virtual Rect clip() const = 0;
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virtual void clip(Rect) = 0;
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virtual void draw_box(Rect, Color) = 0;
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virtual void draw_text(Point, Font const &, Color, char const *) = 0;
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};
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template <typename PT>
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class Decorator::Canvas : public Decorator::Canvas_base
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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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Rect clip() const override { return _surface.clip(); }
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void clip(Rect rect) override { _surface.clip(rect); }
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void draw_box(Rect rect, Color color) override
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{
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Box_painter::paint(_surface, rect, color);
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}
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void draw_text(Point pos, Font const &font,
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Color color, char const *string) override
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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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class Decorator::Clip_guard : Rect
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{
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private:
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Canvas_base &_canvas;
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Rect const _orig_rect;
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public:
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Clip_guard(Canvas_base &canvas, Rect clip_rect)
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_canvas(canvas), _orig_rect(canvas.clip())
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{
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_canvas.clip(Rect::intersect(_orig_rect, clip_rect));
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}
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~Clip_guard() { _canvas.clip(_orig_rect); }
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};
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#endif /* _CANVAS_H_ */
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