SDL_rect.c File Reference

#include "SDL_config.h"
#include "SDL_rect.h"
#include "SDL_rect_c.h"

Go to the source code of this file.

Macros
#define	CODE_BOTTOM   1
#define	CODE_LEFT   4
#define	CODE_RIGHT   8
#define	CODE_TOP   2

Functions
static int	ComputeOutCode (const SDL_Rect *rect, int x, int y)
SDL_bool	SDL_EnclosePoints (const SDL_Point *points, int count, const SDL_Rect *clip, SDL_Rect *result)
	Calculate a minimal rectangle enclosing a set of points. More...
SDL_bool	SDL_GetSpanEnclosingRect (int width, int height, int numrects, const SDL_Rect *rects, SDL_Rect *span)
SDL_bool	SDL_HasIntersection (const SDL_Rect *A, const SDL_Rect *B)
	Determine whether two rectangles intersect. More...
SDL_bool	SDL_IntersectRect (const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *result)
	Calculate the intersection of two rectangles. More...
SDL_bool	SDL_IntersectRectAndLine (const SDL_Rect *rect, int *X1, int *Y1, int *X2, int *Y2)
	Calculate the intersection of a rectangle and line segment. More...
void	SDL_UnionRect (const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *result)
	Calculate the union of two rectangles. More...

Macro Definition Documentation

#define CODE_BOTTOM   1

Definition at line 294 of file SDL_rect.c.

Referenced by ComputeOutCode(), and SDL_IntersectRectAndLine().

#define CODE_LEFT   4

Definition at line 296 of file SDL_rect.c.

Referenced by ComputeOutCode(), and SDL_IntersectRectAndLine().

#define CODE_RIGHT   8

Definition at line 297 of file SDL_rect.c.

Referenced by ComputeOutCode(), and SDL_IntersectRectAndLine().

#define CODE_TOP   2

Definition at line 295 of file SDL_rect.c.

Referenced by ComputeOutCode(), and SDL_IntersectRectAndLine().

Function Documentation

static int ComputeOutCode ( const SDL_Rect *  rect, int  x, int  y  )

static

Definition at line 299 of file SDL_rect.c.

References CODE_BOTTOM, CODE_LEFT, CODE_RIGHT, CODE_TOP, SDL_Rect::h, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_IntersectRectAndLine().

SDL_bool SDL_EnclosePoints	(	const SDL_Point *	points,
		int	count,
		const SDL_Rect *	clip,
		SDL_Rect *	result
	)

Calculate a minimal rectangle enclosing a set of points.

Returns

SDL_TRUE if any points were within the clipping rect

Definition at line 192 of file SDL_rect.c.

References SDL_Rect::h, i, NULL, SDL_FALSE, SDL_InvalidParamError, SDL_RectEmpty(), SDL_TRUE, SDL_Rect::w, SDL_Point::x, SDL_Rect::x, SDL_Point::y, and SDL_Rect::y.

Referenced by SDL_GetWindowDisplayIndex().

SDL_bool SDL_GetSpanEnclosingRect	(	int	width,
		int	height,
		int	numrects,
		const SDL_Rect *	rects,
		SDL_Rect *	span
	)

Definition at line 462 of file SDL_rect.c.

References SDL_Rect::h, i, SDL_FALSE, SDL_InvalidParamError, SDL_TRUE, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_UpdateWindowTexture().

SDL_bool SDL_HasIntersection	(	const SDL_Rect *	A,
		const SDL_Rect *	B
	)

Determine whether two rectangles intersect.

Returns

SDL_TRUE if there is an intersection, SDL_FALSE otherwise.

Definition at line 28 of file SDL_rect.c.

References SDL_Rect::h, SDL_FALSE, SDL_InvalidParamError, SDL_RectEmpty(), SDL_TRUE, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_RenderCopy().

SDL_bool SDL_IntersectRect	(	const SDL_Rect *	A,
		const SDL_Rect *	B,
		SDL_Rect *	result
	)

Calculate the intersection of two rectangles.

Returns

SDL_TRUE if there is an intersection, SDL_FALSE otherwise.

Definition at line 75 of file SDL_rect.c.

References SDL_Rect::h, SDL_FALSE, SDL_InvalidParamError, SDL_RectEmpty(), SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_BlendFillRect(), SDL_BlendFillRects(), SDL_FillRect(), SDL_LowerBlitScaled(), SDL_RenderCopy(), SDL_RenderCopyEx(), SDL_RenderReadPixels(), and SDL_SetClipRect().

SDL_bool SDL_IntersectRectAndLine	(	const SDL_Rect *	rect,
		int *	X1,
		int *	Y1,
		int *	X2,
		int *	Y2
	)

Calculate the intersection of a rectangle and line segment.

Returns

SDL_TRUE if there is an intersection, SDL_FALSE otherwise.

Definition at line 316 of file SDL_rect.c.

References CODE_BOTTOM, CODE_LEFT, CODE_RIGHT, CODE_TOP, ComputeOutCode(), SDL_Rect::h, SDL_FALSE, SDL_InvalidParamError, SDL_RectEmpty(), SDL_TRUE, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_BlendLine(), SDL_BlendLines(), SDL_DrawLine(), and SDL_DrawLines().

void SDL_UnionRect	(	const SDL_Rect *	A,
		const SDL_Rect *	B,
		SDL_Rect *	result
	)

Calculate the union of two rectangles.

Definition at line 129 of file SDL_rect.c.

References SDL_Rect::h, SDL_InvalidParamError, SDL_RectEmpty(), SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.