diff options
Diffstat (limited to 'apps/plugins/lib/gray_verline.c')
-rw-r--r-- | apps/plugins/lib/gray_verline.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/apps/plugins/lib/gray_verline.c b/apps/plugins/lib/gray_verline.c new file mode 100644 index 0000000000..15910b41cf --- /dev/null +++ b/apps/plugins/lib/gray_verline.c | |||
@@ -0,0 +1,88 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Grayscale framework | ||
11 | * gray_verline() 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 vertical line from (x, y1) to (x, y2) with the current drawinfo | ||
34 | ---------------------------------------------------------------------------- | ||
35 | See gray_drawpixel() for details | ||
36 | This one uses the block drawing optimization, so it is rather fast. | ||
37 | */ | ||
38 | void gray_verline(int x, int y1, int y2) | ||
39 | { | ||
40 | int shift, y, ny; | ||
41 | unsigned bits, mask_top, mask_bottom; | ||
42 | unsigned char *dst; | ||
43 | void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits); | ||
44 | |||
45 | if ((unsigned) x >= (unsigned) _graybuf->width | ||
46 | || (unsigned) y1 >= (unsigned) _graybuf->height | ||
47 | || (unsigned) y2 >= (unsigned) _graybuf->height) | ||
48 | return; | ||
49 | |||
50 | if (y1 > y2) | ||
51 | { | ||
52 | y = y1; | ||
53 | y1 = y2; | ||
54 | y2 = y; | ||
55 | } | ||
56 | y = y1; | ||
57 | ny = y2 - y1 + 1; | ||
58 | |||
59 | dst = _graybuf->data + x + MULU16(_graybuf->width, y >> 3); | ||
60 | shift = y & 7; | ||
61 | ny += shift; | ||
62 | |||
63 | mask_top = 0xFFu << (y & 7); | ||
64 | mask_bottom = ~(0xFEu << ((ny - 1) & 7)); | ||
65 | if (ny <= 8) | ||
66 | mask_bottom &= mask_top; | ||
67 | |||
68 | blockfunc = _gray_blockfuncs[_graybuf->drawmode]; | ||
69 | bits = (_graybuf->drawmode == GRAY_DRAW_BG) ? 0u : 0xFFu; | ||
70 | |||
71 | if (ny > 8) | ||
72 | { | ||
73 | blockfunc(dst, mask_top, bits); | ||
74 | dst += _graybuf->width; | ||
75 | |||
76 | for (y = 8; y < ny - 8; y += 8) | ||
77 | { | ||
78 | blockfunc(dst, 0xFFu, bits); | ||
79 | dst += _graybuf->width; | ||
80 | } | ||
81 | } | ||
82 | |||
83 | blockfunc(dst, mask_bottom, bits); | ||
84 | } | ||
85 | |||
86 | #endif // #ifdef HAVE_LCD_BITMAP | ||
87 | #endif // #ifndef SIMULATOR | ||
88 | |||