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SDL_blendrect.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_video.h"
int
SDL_BlendRect(SDL_Surface * dst, const SDL_Rect * rect,
int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_Rect full_rect;
SDL_Point points[5];
if (!dst) {
SDL_SetError("Passed NULL destination surface");
return -1;
}
/* If 'rect' == NULL, then outline the whole surface */
if (!rect) {
full_rect.x = 0;
full_rect.y = 0;
full_rect.w = dst->w;
full_rect.h = dst->h;
rect = &full_rect;
}
points[0].x = rect->x;
points[0].y = rect->y;
points[1].x = rect->x+rect->w-1;
points[1].y = rect->y;
points[2].x = rect->x+rect->w-1;
points[2].y = rect->y+rect->h-1;
points[3].x = rect->x;
points[3].y = rect->y+rect->h-1;
points[4].x = rect->x;
points[4].y = rect->y;
return SDL_BlendLines(dst, points, 5, blendMode, r, g, b, a);
}
int
SDL_BlendRects(SDL_Surface * dst, const SDL_Rect ** rects, int count,
int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
int i;
for (i = 0; i < count; ++i) {
if (SDL_BlendRect(dst, rects[i], blendMode, r, g, b, a) < 0) {
return -1;
}
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */