SDL_rect_c.h File Reference

#include "../SDL_internal.h"

Include dependency graph for SDL_rect_c.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

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

Function Documentation

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

Definition at line 469 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().

{
    int i;
    int span_y1, span_y2;
    int rect_y1, rect_y2;

    if (width < 1) {
        SDL_InvalidParamError("width");
        return SDL_FALSE;
    }

    if (height < 1) {
        SDL_InvalidParamError("height");
        return SDL_FALSE;
    }

    if (!rects) {
        SDL_InvalidParamError("rects");
        return SDL_FALSE;
    }

    if (!span) {
        SDL_InvalidParamError("span");
        return SDL_FALSE;
    }

    if (numrects < 1) {
        SDL_InvalidParamError("numrects");
        return SDL_FALSE;
    }

    /* Initialize to empty rect */
    span_y1 = height;
    span_y2 = 0;

    for (i = 0; i < numrects; ++i) {
        rect_y1 = rects[i].y;
        rect_y2 = rect_y1 + rects[i].h;

        /* Clip out of bounds rectangles, and expand span rect */
        if (rect_y1 < 0) {
            span_y1 = 0;
        } else if (rect_y1 < span_y1) {
            span_y1 = rect_y1;
        }
        if (rect_y2 > height) {
            span_y2 = height;
        } else if (rect_y2 > span_y2) {
            span_y2 = rect_y2;
        }
    }
    if (span_y2 > span_y1) {
        span->x = 0;
        span->y = span_y1;
        span->w = width;
        span->h = (span_y2 - span_y1);
        return SDL_TRUE;
    }
    return SDL_FALSE;
}