Mercurial > sdl-ios-xcode

annotate src/video/SDL_drawline.c @ 2912:1d50666ed3d5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fixed clipping source rect to match destination rect clipping
author Sam Lantinga <slouken@libsdl.org>
date Tue, 23 Dec 2008 04:51:36 +0000
parents 27d8b12e0e8e
children 0267b8b1595c
rev   line source
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
1 /*
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
2 SDL - Simple DirectMedia Layer
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
3 Copyright (C) 1997-2009 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
4
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
5 This library is free software; you can redistribute it and/or
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
6 modify it under the terms of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
7 License as published by the Free Software Foundation; either
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
8 version 2.1 of the License, or (at your option) any later version.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
9
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
10 This library is distributed in the hope that it will be useful,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
13 Lesser General Public License for more details.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
14
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
15 You should have received a copy of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
16 License along with this library; if not, write to the Free Software
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
18
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
19 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
20 slouken@libsdl.org
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
21 */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
22 #include "SDL_config.h"
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
23
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
24 #include "SDL_draw.h"
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
25
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
26
2901
133601e3b255 Added RenderPiont() API
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
27 int
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
28 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
29 {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
30 /* This function doesn't work on surfaces < 8 bpp */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
31 if (dst->format->BitsPerPixel < 8) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
32 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
33 return (-1);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
34 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
35
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
36 /* Perform clipping */
2910
27d8b12e0e8e Fixed argument order to the line clipping routine
Sam Lantinga <slouken@libsdl.org>
parents: 2909
diff changeset
37 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
38 return (0);
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
39 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
40
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
41 switch (dst->format->BytesPerPixel) {
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
42 case 1:
2901
133601e3b255 Added RenderPiont() API
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
43 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1);
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
44 break;
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
45 case 2:
2901
133601e3b255 Added RenderPiont() API
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
46 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2);
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
47 break;
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
48 case 3:
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
49 SDL_Unsupported();
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
50 return -1;
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
51 case 4:
2901
133601e3b255 Added RenderPiont() API
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
52 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4);
2890
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
53 break;
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
54 }
1863c8b59658 Placeholder for line drawing algorithm (current code doesn't work)
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
55 return 0;
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
56 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
57
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
58 /* vi: set ts=4 sw=4 expandtab: */