raster.c File Reference

#include <math.h>
#include <glib.h>
#include "raster.h"

Macros
#define	raster_rect_inline   raster_rect
#define	MODIFIED_ALPHA_PIXEL_ROUTINE
#define	clip_xmin(surface)   surface->clip_rect.x
#define	clip_xmax(surface)   surface->clip_rect.x+surface->clip_rect.w-1
#define	clip_ymin(surface)   surface->clip_rect.y
#define	clip_ymax(surface)   surface->clip_rect.y+surface->clip_rect.h-1
#define	CLIP_LEFT_EDGE   0x1
#define	CLIP_RIGHT_EDGE   0x2
#define	CLIP_BOTTOM_EDGE   0x4
#define	CLIP_TOP_EDGE   0x8
#define	CLIP_INSIDE(a)   (!a)
#define	CLIP_REJECT(a, b)   (a&b)
#define	CLIP_ACCEPT(a, b)   (!(a|b))
#define	AAlevels   256
#define	AAbits   8

Functions
static void	raster_rect_inline (SDL_Surface *dst, int16_t x1, int16_t y1, int16_t w, int16_t h, uint32_t color)
void	raster_rect (SDL_Surface *s, int16_t x, int16_t y, int16_t w, int16_t h, uint32_t col)
static void	raster_PutPixel (SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
static void	raster_PutPixelAlpha (SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color, Uint8 alpha)
static int	raster_pixelColorNolock (SDL_Surface *dst, Sint16 x, Sint16 y, Uint32 color)
static int	raster_pixelColorWeightNolock (SDL_Surface *dst, Sint16 x, Sint16 y, Uint32 color, Uint32 weight)
static void	raster_hline (SDL_Surface *dst, Sint16 x1, Sint16 x2, Sint16 y, Uint32 color)
static void	raster_vline (SDL_Surface *dst, Sint16 x, Sint16 y1, Sint16 y2, Uint32 color)
static int	clipEncode (Sint16 x, Sint16 y, Sint16 left, Sint16 top, Sint16 right, Sint16 bottom)
static int	clipLine (SDL_Surface *dst, Sint16 *x1, Sint16 *y1, Sint16 *x2, Sint16 *y2)
void	raster_line (SDL_Surface *dst, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint32_t color)
static void	raster_aalineColorInt (SDL_Surface *dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color, int draw_endpoint)
void	raster_aaline (SDL_Surface *s, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint32_t col)
void	raster_circle (SDL_Surface *dst, int16_t x, int16_t y, int16_t r, uint32_t color)
static void	raster_AAFilledEllipse (SDL_Surface *surface, Sint16 xc, Sint16 yc, Sint16 rx, Sint16 ry, Uint32 color)
void	raster_aacircle (SDL_Surface *s, int16_t x, int16_t y, int16_t r, uint32_t col)
static int	gfxPrimitivesCompareInt (const void *a, const void *b)
static int	raster_filledPolygonColorMT (SDL_Surface *dst, const Sint16 *vx, const Sint16 *vy, int n, Uint32 color, int **polyInts, int *polyAllocated)
void	raster_polygon (SDL_Surface *s, int16_t n, int16_t *vx, int16_t *vy, uint32_t col)
void	raster_aapolygon (SDL_Surface *dst, int16_t n, int16_t *vx, int16_t *vy, uint32_t color)
void	raster_aapolygon_with_holes (SDL_Surface *s, struct point *p, int count, int hole_count, int *ccount, struct point **holes, uint32_t col)
	render filled polygon with holes by raycasting along the y axis More...
void	raster_polygon_with_holes (SDL_Surface *s, struct point *p, int count, int hole_count, int *ccount, struct point **holes, uint32_t col)
	render filled polygon with holes by raycasting along the y axis More...

Variables
static int *	gfxPrimitivesPolyIntsGlobal = NULL
static int	gfxPrimitivesPolyAllocatedGlobal = 0

Macro Definition Documentation

AAbits

#define AAbits   8

AAlevels

#define AAlevels   256

CLIP_ACCEPT

#define CLIP_ACCEPT	(		a,
			b
	)		(!(a|b))

CLIP_BOTTOM_EDGE

#define CLIP_BOTTOM_EDGE   0x4

CLIP_INSIDE

#define CLIP_INSIDE

(

a

)

(!a)

CLIP_LEFT_EDGE

#define CLIP_LEFT_EDGE   0x1

CLIP_REJECT

#define CLIP_REJECT	(		a,
			b
	)		(a&b)

CLIP_RIGHT_EDGE

#define CLIP_RIGHT_EDGE   0x2

CLIP_TOP_EDGE

#define CLIP_TOP_EDGE   0x8

clip_xmax

#define clip_xmax

(

surface

)

surface->clip_rect.x+surface->clip_rect.w-1

clip_xmin

#define clip_xmin

(

surface

)

surface->clip_rect.x

clip_ymax

#define clip_ymax

(

surface

)

surface->clip_rect.y+surface->clip_rect.h-1

clip_ymin

#define clip_ymin

(

surface

)

surface->clip_rect.y

MODIFIED_ALPHA_PIXEL_ROUTINE

#define MODIFIED_ALPHA_PIXEL_ROUTINE

raster_rect_inline

#define raster_rect_inline   raster_rect

Function Documentation

clipEncode()

static int clipEncode ( Sint16  x, Sint16  y, Sint16  left, Sint16  top, Sint16  right, Sint16  bottom  )

static

References CLIP_BOTTOM_EDGE, CLIP_LEFT_EDGE, CLIP_RIGHT_EDGE, and CLIP_TOP_EDGE.

Referenced by clipLine().

clipLine()

static int clipLine ( SDL_Surface *  dst, Sint16 *  x1, Sint16 *  y1, Sint16 *  x2, Sint16 *  y2  )

static

References CLIP_ACCEPT, CLIP_BOTTOM_EDGE, CLIP_INSIDE, CLIP_LEFT_EDGE, CLIP_REJECT, CLIP_RIGHT_EDGE, CLIP_TOP_EDGE, and clipEncode().

Referenced by raster_aalineColorInt(), and raster_line().

gfxPrimitivesCompareInt()

static int gfxPrimitivesCompareInt ( const void *  a, const void *  b  )

static

Referenced by raster_aapolygon(), raster_filledPolygonColorMT(), and raster_polygon_with_holes().

raster_aacircle()

void raster_aacircle	(	SDL_Surface *	s,
		int16_t	x,
		int16_t	y,
		int16_t	r,
		uint32_t	col
	)

References raster_AAFilledEllipse().

Referenced by draw_circle().

raster_AAFilledEllipse()

static void raster_AAFilledEllipse ( SDL_Surface *  surface, Sint16  xc, Sint16  yc, Sint16  rx, Sint16  ry, Uint32  color  )

static

References raster_hline(), raster_PutPixel(), raster_PutPixelAlpha(), and raster_vline().

Referenced by raster_aacircle().

raster_aaline()

void raster_aaline	(	SDL_Surface *	s,
		int16_t	x1,
		int16_t	y1,
		int16_t	x2,
		int16_t	y2,
		uint32_t	col
	)

References raster_aalineColorInt().

Referenced by draw_lines().

raster_aalineColorInt()

static void raster_aalineColorInt ( SDL_Surface *  dst, Sint16  x1, Sint16  y1, Sint16  x2, Sint16  y2, Uint32  color, int  draw_endpoint  )

static

References AAbits, clipLine(), raster_hline(), raster_line(), raster_pixelColorNolock(), raster_pixelColorWeightNolock(), and raster_vline().

Referenced by raster_aaline(), raster_aapolygon(), and raster_aapolygon_with_holes().

raster_aapolygon()

void raster_aapolygon	(	SDL_Surface *	dst,
		int16_t	n,
		int16_t *	vx,
		int16_t *	vy,
		uint32_t	color
	)

References gfxPrimitivesCompareInt(), gfxPrimitivesPolyAllocatedGlobal, gfxPrimitivesPolyIntsGlobal, p, raster_aalineColorInt(), and raster_hline().

raster_aapolygon_with_holes()

void raster_aapolygon_with_holes	(	SDL_Surface *	s,
		struct point *	p,
		int	count,
		int	hole_count,
		int *	ccount,
		struct point **	holes,
		uint32_t	col
	)

render filled polygon with holes by raycasting along the y axis

This function renders a filled polygon that can have holes by SDL primitive graphic functions by raycasting along the y axis. This works basically the same as for complex polygons. Only difference is the "holes" are individual polygon loops not connected to the outer loop. FIXME: This draws well as long as the "hole" does not intersect with the outer polygon. However such multipolygons are seen a mapping error in OSM and therefore the rendering err may even help in detecting them. But this could be fixed by never starting a line on a vertex that came from a hole intersection.

Parameters

s	SDL surface to draw on
p	Array of points containing the outer polygon
count	Number of points in outer polygon
hole_count	Number of hole polygons
ccount	number of points per hole polygon @oaram holes array of point arrays. One for each "hole"
col	Color to draw this.

References p, raster_aalineColorInt(), raster_polygon_with_holes(), point::x, and point::y.

Referenced by draw_polygon_with_holes().

raster_circle()

void raster_circle	(	SDL_Surface *	dst,
		int16_t	x,
		int16_t	y,
		int16_t	r,
		uint32_t	color
	)

References raster_hline(), and raster_PutPixel().

Referenced by draw_circle().

raster_filledPolygonColorMT()

static int raster_filledPolygonColorMT ( SDL_Surface *  dst, const Sint16 *  vx, const Sint16 *  vy, int  n, Uint32  color, int **  polyInts, int *  polyAllocated  )

inlinestatic

References gfxPrimitivesCompareInt(), gfxPrimitivesPolyAllocatedGlobal, gfxPrimitivesPolyIntsGlobal, and raster_hline().

Referenced by raster_polygon().

raster_hline()

static void raster_hline ( SDL_Surface *  dst, Sint16  x1, Sint16  x2, Sint16  y, Uint32  color  )

inlinestatic

Referenced by raster_AAFilledEllipse(), raster_aalineColorInt(), raster_aapolygon(), raster_circle(), raster_filledPolygonColorMT(), raster_line(), and raster_polygon_with_holes().

raster_line()

void raster_line	(	SDL_Surface *	dst,
		int16_t	x1,
		int16_t	y1,
		int16_t	x2,
		int16_t	y2,
		uint32_t	color
	)

References clipLine(), raster_hline(), raster_PutPixel(), and raster_vline().

Referenced by draw_lines(), and raster_aalineColorInt().

raster_pixelColorNolock()

static int raster_pixelColorNolock ( SDL_Surface *  dst, Sint16  x, Sint16  y, Uint32  color  )

static

References raster_PutPixel().

Referenced by raster_aalineColorInt().

raster_pixelColorWeightNolock()

static int raster_pixelColorWeightNolock ( SDL_Surface *  dst, Sint16  x, Sint16  y, Uint32  color, Uint32  weight  )

static

References raster_PutPixelAlpha().

Referenced by raster_aalineColorInt().

raster_polygon()

void raster_polygon	(	SDL_Surface *	s,
		int16_t	n,
		int16_t *	vx,
		int16_t *	vy,
		uint32_t	col
	)

References raster_filledPolygonColorMT().

raster_polygon_with_holes()

void raster_polygon_with_holes	(	SDL_Surface *	s,
		struct point *	p,
		int	count,
		int	hole_count,
		int *	ccount,
		struct point **	holes,
		uint32_t	col
	)

render filled polygon with holes by raycasting along the y axis

This function renders a filled polygon that can have holes by SDL primitive graphic functions by raycasting along the y axis. This works basically the same as for complex polygons. Only difference is the "holes" are individual polygon loops not connected to the outer loop. FIXME: This draws well as long as the "hole" does not intersect with the outer polygon. However such multipolygons are seen a mapping error in OSM and therefore the rendering err may even help in detecting them. But this could be fixed by never starting a line on a vertex that came from a hole intersection.

Parameters

s	SDL surface to draw on
p	Array of points containing the outer polygon
count	Number of points in outer polygon
hole_count	Number of hole polygons
ccount	number of points per hole polygon @oaram holes array of point arrays. One for each "hole"
col	Color to draw this.

References gfxPrimitivesCompareInt(), p, raster_hline(), point::x, and point::y.

Referenced by draw_polygon_with_holes(), and raster_aapolygon_with_holes().

raster_PutPixel()

static void raster_PutPixel ( SDL_Surface *  surface, Sint16  x, Sint16  y, Uint32  color  )

static

References clip_xmax, clip_xmin, clip_ymax, and clip_ymin.

Referenced by raster_AAFilledEllipse(), raster_circle(), raster_line(), and raster_pixelColorNolock().

raster_PutPixelAlpha()

static void raster_PutPixelAlpha ( SDL_Surface *  surface, Sint16  x, Sint16  y, Uint32  color, Uint8  alpha  )

static

References clip_xmax, clip_xmin, clip_ymax, clip_ymin, and color::r.

Referenced by raster_AAFilledEllipse(), and raster_pixelColorWeightNolock().

raster_rect()

void raster_rect	(	SDL_Surface *	s,
		int16_t	x,
		int16_t	y,
		int16_t	w,
		int16_t	h,
		uint32_t	col
	)

References raster_rect_inline.

Referenced by draw_rectangle().

raster_rect_inline()

static void raster_rect_inline ( SDL_Surface *  dst, int16_t  x1, int16_t  y1, int16_t  w, int16_t  h, uint32_t  color  )

inlinestatic

References rect::h.

raster_vline()

static void raster_vline ( SDL_Surface *  dst, Sint16  x, Sint16  y1, Sint16  y2, Uint32  color  )

static

Referenced by raster_AAFilledEllipse(), raster_aalineColorInt(), and raster_line().

Variable Documentation

gfxPrimitivesPolyAllocatedGlobal

int gfxPrimitivesPolyAllocatedGlobal = 0

static

Referenced by raster_aapolygon(), and raster_filledPolygonColorMT().

gfxPrimitivesPolyIntsGlobal

int* gfxPrimitivesPolyIntsGlobal = NULL

static

Referenced by raster_aapolygon(), and raster_filledPolygonColorMT().