SDL_drawpoint.h File Reference

#include "../../SDL_internal.h"

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Functions
int	SDL_DrawPoint (SDL_Surface *dst, int x, int y, Uint32 color)
int	SDL_DrawPoints (SDL_Surface *dst, const SDL_Point *points, int count, Uint32 color)

Function Documentation

int SDL_DrawPoint	(	SDL_Surface *	dst,
		int	x,
		int	y,
		Uint32	color
	)

Definition at line 30 of file SDL_drawpoint.c.

References SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::BytesPerPixel, SDL_Surface::clip_rect, DRAW_FASTSETPIXELXY1, DRAW_FASTSETPIXELXY2, DRAW_FASTSETPIXELXY4, SDL_Surface::format, SDL_Rect::h, SDL_SetError, SDL_Unsupported, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_DrawLines().

{
    if (!dst) {
        return SDL_SetError("Passed NULL destination surface");
    }

    /* This function doesn't work on surfaces < 8 bpp */
    if (dst->format->BitsPerPixel < 8) {
        return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
    }

    /* Perform clipping */
    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
        return 0;
    }

    switch (dst->format->BytesPerPixel) {
    case 1:
        DRAW_FASTSETPIXELXY1(x, y);
        break;
    case 2:
        DRAW_FASTSETPIXELXY2(x, y);
        break;
    case 3:
        return SDL_Unsupported();
    case 4:
        DRAW_FASTSETPIXELXY4(x, y);
        break;
    }
    return 0;
}

int SDL_DrawPoints	(	SDL_Surface *	dst,
		const SDL_Point *	points,
		int	count,
		Uint32	color
	)

Definition at line 65 of file SDL_drawpoint.c.

References SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::BytesPerPixel, SDL_Surface::clip_rect, DRAW_FASTSETPIXELXY1, DRAW_FASTSETPIXELXY2, DRAW_FASTSETPIXELXY4, SDL_Surface::format, SDL_Rect::h, i, SDL_SetError, SDL_Unsupported, SDL_Rect::w, SDL_Point::x, SDL_Rect::x, SDL_Point::y, and SDL_Rect::y.

Referenced by SW_RenderDrawPoints().

{
    int minx, miny;
    int maxx, maxy;
    int i;
    int x, y;

    if (!dst) {
        return SDL_SetError("Passed NULL destination surface");
    }

    /* This function doesn't work on surfaces < 8 bpp */
    if (dst->format->BitsPerPixel < 8) {
        return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
    }

    minx = dst->clip_rect.x;
    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
    miny = dst->clip_rect.y;
    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;

    for (i = 0; i < count; ++i) {
        x = points[i].x;
        y = points[i].y;

        if (x < minx || x > maxx || y < miny || y > maxy) {
            continue;
        }

        switch (dst->format->BytesPerPixel) {
        case 1:
            DRAW_FASTSETPIXELXY1(x, y);
            break;
        case 2:
            DRAW_FASTSETPIXELXY2(x, y);
            break;
        case 3:
            return SDL_Unsupported();
        case 4:
            DRAW_FASTSETPIXELXY4(x, y);
            break;
        }
    }
    return 0;
}