mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 14:13:09 +00:00
120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/*
|
|
* \brief Generic interface of graphics backend
|
|
* \date 2006-08-04
|
|
* \author Norman Feske
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__NITPICKER_GFX__CANVAS_H_
|
|
#define _INCLUDE__NITPICKER_GFX__CANVAS_H_
|
|
|
|
#include <nitpicker_gfx/miscmath.h>
|
|
#include <nitpicker_gfx/color.h>
|
|
#include <nitpicker_gfx/font.h>
|
|
#include <nitpicker_gfx/geometry.h>
|
|
|
|
|
|
class Texture : public Area
|
|
{
|
|
public:
|
|
|
|
Texture(Area size): Area(size) { }
|
|
|
|
virtual ~Texture() { }
|
|
|
|
/**
|
|
* Return pointer to alpha values, or 0 if no alpha channel exists
|
|
*/
|
|
virtual unsigned char *alpha() { return 0; }
|
|
};
|
|
|
|
|
|
/*
|
|
* A canvas is a rectangular surface to which drawing operations can be
|
|
* applied. All coordinates are specified in pixels. The coordinate origin
|
|
* is the top-left corner of the canvas.
|
|
*/
|
|
class Canvas
|
|
{
|
|
protected:
|
|
|
|
Rect _clip; /* clipping area */
|
|
Area _size; /* boundaries of canvas */
|
|
|
|
/**
|
|
* Constructor
|
|
*/
|
|
Canvas(Area size):
|
|
_clip(Point(0, 0), size), _size(size) { }
|
|
|
|
/**
|
|
* Register canvas area as to be flushed
|
|
*
|
|
* This function is called by the graphics primitives when
|
|
* canvas regions are changed.
|
|
*/
|
|
virtual void _flush_pixels(Rect) { }
|
|
|
|
public:
|
|
|
|
/*
|
|
* Modes for drawing textures
|
|
*
|
|
* The solid mode is used for normal operation in Nitpicker's
|
|
* flat mode and corresponds to plain pixel blitting. The
|
|
* masked mode allows us to tint texture with a specified
|
|
* mixing color. This feature is used by the X-Ray and Kill
|
|
* mode. The masked mode leaves all pixels untouched for
|
|
* which the corresponding texture pixel equals the mask key
|
|
* color (we use black). We use this mode for painting
|
|
* the mouse cursor.
|
|
*/
|
|
enum Mode {
|
|
SOLID = 0, /* draw texture pixel */
|
|
MIXED = 1, /* mix texture pixel and color 1:1 */
|
|
MASKED = 2, /* skip pixels with mask color */
|
|
};
|
|
|
|
virtual ~Canvas() { }
|
|
|
|
/**
|
|
* Define/request clipping rectangle
|
|
*/
|
|
void clip(Rect clip) { _clip = Rect::intersect(Rect(Point(0, 0), _size), clip); }
|
|
Rect clip() { return _clip; }
|
|
bool clip_valid() { return _clip.valid(); }
|
|
|
|
/**
|
|
* Return dimension of canvas in pixels
|
|
*/
|
|
Area size() { return _size; }
|
|
|
|
/**
|
|
* Draw filled box
|
|
*
|
|
* \param rect position and size of box.
|
|
* \param color drawing color.
|
|
*/
|
|
virtual void draw_box(Rect rect, Color color) = 0;
|
|
|
|
/**
|
|
* Draw string
|
|
*/
|
|
virtual void draw_string(Point position, Font *font, Color color,
|
|
const char *str) = 0;
|
|
|
|
/**
|
|
* Draw texture
|
|
*/
|
|
virtual void draw_texture(Texture *src, Color mix_color, Point position,
|
|
Mode mode, bool allow_alpha = true) = 0;
|
|
};
|
|
|
|
#endif /* _INCLUDE__NITPICKER_GFX__CANVAS_H_ */
|