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120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/*
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* \brief Generic interface of graphics backend
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* \date 2006-08-04
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* \author Norman Feske
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*/
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/*
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* Copyright (C) 2006-2011 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 _INCLUDE__NITPICKER_GFX__CANVAS_H_
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#define _INCLUDE__NITPICKER_GFX__CANVAS_H_
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#include <nitpicker_gfx/miscmath.h>
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#include <nitpicker_gfx/color.h>
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#include <nitpicker_gfx/font.h>
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#include <nitpicker_gfx/geometry.h>
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class Texture : public Area
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{
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public:
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Texture(Area size): Area(size) { }
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virtual ~Texture() { }
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/**
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* Return pointer to alpha values, or 0 if no alpha channel exists
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*/
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virtual unsigned char *alpha() { return 0; }
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};
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/*
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* A canvas is a rectangular surface to which drawing operations can be
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* applied. All coordinates are specified in pixels. The coordinate origin
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* is the top-left corner of the canvas.
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*/
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class Canvas
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{
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protected:
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Rect _clip; /* clipping area */
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Area _size; /* boundaries of canvas */
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/**
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* Constructor
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*/
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Canvas(Area size):
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_clip(Point(0, 0), size), _size(size) { }
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/**
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* Register canvas area as to be flushed
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*
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* This function is called by the graphics primitives when
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* canvas regions are changed.
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*/
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virtual void _flush_pixels(Rect) { }
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public:
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/*
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* Modes for drawing textures
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*
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* The solid mode is used for normal operation in Nitpicker's
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* flat mode and corresponds to plain pixel blitting. The
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* masked mode allows us to tint texture with a specified
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* mixing color. This feature is used by the X-Ray and Kill
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* mode. The masked mode leaves all pixels untouched for
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* which the corresponding texture pixel equals the mask key
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* color (we use black). We use this mode for painting
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* the mouse cursor.
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*/
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enum Mode {
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SOLID = 0, /* draw texture pixel */
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MIXED = 1, /* mix texture pixel and color 1:1 */
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MASKED = 2, /* skip pixels with mask color */
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};
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virtual ~Canvas() { }
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/**
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* Define/request clipping rectangle
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*/
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void clip(Rect clip) { _clip = Rect::intersect(Rect(Point(0, 0), _size), clip); }
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Rect clip() { return _clip; }
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bool clip_valid() { return _clip.valid(); }
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/**
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* Return dimension of canvas in pixels
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*/
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Area size() { return _size; }
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/**
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* Draw filled box
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*
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* \param rect position and size of box.
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* \param color drawing color.
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*/
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virtual void draw_box(Rect rect, Color color) = 0;
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/**
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* Draw string
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*/
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virtual void draw_string(Point position, Font *font, Color color,
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const char *str) = 0;
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/**
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* Draw texture
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*/
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virtual void draw_texture(Texture *src, Color mix_color, Point position,
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Mode mode, bool allow_alpha = true) = 0;
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};
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#endif /* _INCLUDE__NITPICKER_GFX__CANVAS_H_ */
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