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SDL_drawpoint.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_draw.h"
int
SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
{
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if (!dst) {
SDL_SetError("Passed NULL destination surface");
return -1;
}
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/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
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SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
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}
/* 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:
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DRAW_FASTSETPIXELXY1(x, y);
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break;
case 2:
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DRAW_FASTSETPIXELXY2(x, y);
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break;
case 3:
SDL_Unsupported();
return -1;
case 4:
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DRAW_FASTSETPIXELXY4(x, y);
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break;
}
return 0;
}
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int
SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
Uint32 color)
{
int minx, miny;
int maxx, maxy;
int i;
int x, y;
if (!dst) {
SDL_SetError("Passed NULL destination surface");
return -1;
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
return -1;
}
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:
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DRAW_FASTSETPIXELXY1(x, y);
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break;
case 2:
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DRAW_FASTSETPIXELXY2(x, y);
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break;
case 3:
SDL_Unsupported();
return -1;
case 4:
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DRAW_FASTSETPIXELXY4(x, y);
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break;
}
}
return 0;
}
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/* vi: set ts=4 sw=4 expandtab: */