Mercurial > sdl-ios-xcode

comparison src/video/SDL_blendrect.c @ 3594:c8bed77b0386

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects() Fixed line drawing so when blending a sequence of lines there are no overlapping pixels drawn.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 18 Dec 2009 07:41:59 +0000
parents
children f7b03b6838cb
comparison
equal deleted inserted replaced
3593:b931bcfd94a0 3594:c8bed77b0386
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "SDL_video.h"
25
26
27 int
28 SDL_BlendRect(SDL_Surface * dst, const SDL_Rect * rect,
29 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
30 {
31 SDL_Rect full_rect;
32 SDL_Point points[5];
33
34 if (!dst) {
35 SDL_SetError("Passed NULL destination surface");
36 return -1;
37 }
38
39 /* If 'rect' == NULL, then outline the whole surface */
40 if (!rect) {
41 full_rect.x = 0;
42 full_rect.y = 0;
43 full_rect.w = dst->w;
44 full_rect.h = dst->h;
45 rect = &full_rect;
46 }
47
48 points[0].x = rect->x;
49 points[0].y = rect->y;
50 points[1].x = rect->x+rect->w-1;
51 points[1].y = rect->y;
52 points[2].x = rect->x+rect->w-1;
53 points[2].y = rect->y+rect->h-1;
54 points[3].x = rect->x;
55 points[3].y = rect->y+rect->h-1;
56 points[4].x = rect->x;
57 points[4].y = rect->y;
58 return SDL_BlendLines(dst, points, 5, blendMode, r, g, b, a);
59 }
60
61 int
62 SDL_BlendRects(SDL_Surface * dst, const SDL_Rect ** rects, int count,
63 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
64 {
65 int i;
66
67 for (i = 0; i < count; ++i) {
68 if (SDL_BlendRect(dst, rects[i], blendMode, r, g, b, a) < 0) {
69 return -1;
70 }
71 }
72 return 0;
73 }
74
75 /* vi: set ts=4 sw=4 expandtab: */