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author | Jens Arnold <amiconn@rockbox.org> | 2004-06-23 22:15:50 +0000 |
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committer | Jens Arnold <amiconn@rockbox.org> | 2004-06-23 22:15:50 +0000 |
commit | 7c6bdd64935452464b21f99198896c34569105e5 (patch) | |
tree | becd4aeb5498966aea5629f1e692ba5131192b5e /apps/plugins/lib/gray_drawline.c | |
parent | 8877ad943eb077d10a0725b47c55a8b2f55f319a (diff) | |
download | rockbox-7c6bdd64935452464b21f99198896c34569105e5.tar.gz rockbox-7c6bdd64935452464b21f99198896c34569105e5.zip |
Split grayscale library into several files to make up a real function library. Significantly decreases binary size for plugins using it.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4802 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/lib/gray_drawline.c')
-rw-r--r-- | apps/plugins/lib/gray_drawline.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/apps/plugins/lib/gray_drawline.c b/apps/plugins/lib/gray_drawline.c new file mode 100644 index 0000000000..5ec4967c14 --- /dev/null +++ b/apps/plugins/lib/gray_drawline.c | |||
@@ -0,0 +1,119 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Grayscale framework | ||
11 | * gray_drawline() function | ||
12 | * | ||
13 | * This is a generic framework to use grayscale display within Rockbox | ||
14 | * plugins. It obviously does not work for the player. | ||
15 | * | ||
16 | * Copyright (C) 2004 Jens Arnold | ||
17 | * | ||
18 | * All files in this archive are subject to the GNU General Public License. | ||
19 | * See the file COPYING in the source tree root for full license agreement. | ||
20 | * | ||
21 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
22 | * KIND, either express or implied. | ||
23 | * | ||
24 | ****************************************************************************/ | ||
25 | |||
26 | #ifndef SIMULATOR /* not for simulator by now */ | ||
27 | #include "plugin.h" | ||
28 | |||
29 | #ifdef HAVE_LCD_BITMAP /* and also not for the Player */ | ||
30 | #include "gray.h" | ||
31 | |||
32 | /*--------------------------------------------------------------------------- | ||
33 | Draw a line from (x1, y1) to (x2, y2) with the current drawinfo | ||
34 | ---------------------------------------------------------------------------- | ||
35 | See gray_drawpixel() for details | ||
36 | */ | ||
37 | void gray_drawline(int x1, int y1, int x2, int y2) | ||
38 | { | ||
39 | int numpixels; | ||
40 | int i; | ||
41 | int deltax, deltay; | ||
42 | int d, dinc1, dinc2; | ||
43 | int x, xinc1, xinc2; | ||
44 | int y, yinc1, yinc2; | ||
45 | unsigned long pattern; | ||
46 | void (*pixelfunc)(int x, int y, unsigned long pattern); | ||
47 | |||
48 | if ((unsigned) x1 >= (unsigned) _graybuf->width | ||
49 | || (unsigned) y1 >= (unsigned) _graybuf->height | ||
50 | || (unsigned) x2 >= (unsigned) _graybuf->width | ||
51 | || (unsigned) y2 >= (unsigned) _graybuf->height) | ||
52 | return; | ||
53 | |||
54 | deltax = abs(x2 - x1); | ||
55 | deltay = abs(y2 - y1); | ||
56 | xinc2 = 1; | ||
57 | yinc2 = 1; | ||
58 | |||
59 | if (deltax >= deltay) | ||
60 | { | ||
61 | numpixels = deltax; | ||
62 | d = 2 * deltay - deltax; | ||
63 | dinc1 = deltay * 2; | ||
64 | dinc2 = (deltay - deltax) * 2; | ||
65 | xinc1 = 1; | ||
66 | yinc1 = 0; | ||
67 | } | ||
68 | else | ||
69 | { | ||
70 | numpixels = deltay; | ||
71 | d = 2 * deltax - deltay; | ||
72 | dinc1 = deltax * 2; | ||
73 | dinc2 = (deltax - deltay) * 2; | ||
74 | xinc1 = 0; | ||
75 | yinc1 = 1; | ||
76 | } | ||
77 | numpixels++; /* include endpoints */ | ||
78 | |||
79 | if (x1 > x2) | ||
80 | { | ||
81 | xinc1 = -xinc1; | ||
82 | xinc2 = -xinc2; | ||
83 | } | ||
84 | |||
85 | if (y1 > y2) | ||
86 | { | ||
87 | yinc1 = -yinc1; | ||
88 | yinc2 = -yinc2; | ||
89 | } | ||
90 | |||
91 | x = x1; | ||
92 | y = y1; | ||
93 | |||
94 | pixelfunc = _gray_pixelfuncs[_graybuf->drawmode]; | ||
95 | pattern = (_graybuf->drawmode == GRAY_DRAW_BG) ? | ||
96 | _graybuf->bg_pattern : _graybuf->fg_pattern; | ||
97 | |||
98 | for (i = 0; i < numpixels; i++) | ||
99 | { | ||
100 | pixelfunc(x, y, pattern); | ||
101 | |||
102 | if (d < 0) | ||
103 | { | ||
104 | d += dinc1; | ||
105 | x += xinc1; | ||
106 | y += yinc1; | ||
107 | } | ||
108 | else | ||
109 | { | ||
110 | d += dinc2; | ||
111 | x += xinc2; | ||
112 | y += yinc2; | ||
113 | } | ||
114 | } | ||
115 | } | ||
116 | |||
117 | #endif // #ifdef HAVE_LCD_BITMAP | ||
118 | #endif // #ifndef SIMULATOR | ||
119 | |||