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-rw-r--r--apps/plugins/lib/gray_scroll_up.c135
1 files changed, 0 insertions, 135 deletions
diff --git a/apps/plugins/lib/gray_scroll_up.c b/apps/plugins/lib/gray_scroll_up.c
deleted file mode 100644
index 4c493071af..0000000000
--- a/apps/plugins/lib/gray_scroll_up.c
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1/***************************************************************************
2* __________ __ ___.
3* Open \______ \ ____ ____ | | _\_ |__ _______ ___
4* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7* \/ \/ \/ \/ \/
8* $Id$
9*
10* Grayscale framework
11* gray_scroll_up() 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#if CONFIG_LCD == LCD_SSD1815 /* only for Recorder/Ondio */
30#include "gray.h"
31
32/*---------------------------------------------------------------------------
33 Scroll the whole grayscale buffer up by <count> pixels (<= 7)
34 ----------------------------------------------------------------------------
35 black_border determines if the pixels scrolled in at the bottom are black
36 or white
37
38 Scrolling up/down pixel-wise is significantly slower than scrolling
39 left/right or scrolling up/down byte-wise because it involves bit
40 shifting. That's why it is asm optimized.
41 */
42void gray_scroll_up(int count, bool black_border)
43{
44 unsigned filler;
45
46 if ((unsigned) count > 7)
47 return;
48
49 filler = black_border ? 0xFFu : 0;
50
51 /* scroll column by column to minimize flicker */
52 asm volatile (
53 "mov #0,r6 \n" /* x = 0 */
54 "mova .su_shifttbl,r0 \n" /* calculate jump destination for */
55 "mov.b @(r0,%6),%6 \n" /* shift amount from table */
56 "bra .su_cloop \n" /* skip table */
57 "add r0,%6 \n"
58
59 ".align 2 \n"
60 ".su_shifttbl: \n" /* shift jump offset table */
61 ".byte .su_shift0 - .su_shifttbl \n"
62 ".byte .su_shift1 - .su_shifttbl \n"
63 ".byte .su_shift2 - .su_shifttbl \n"
64 ".byte .su_shift3 - .su_shifttbl \n"
65 ".byte .su_shift4 - .su_shifttbl \n"
66 ".byte .su_shift5 - .su_shifttbl \n"
67 ".byte .su_shift6 - .su_shifttbl \n"
68 ".byte .su_shift7 - .su_shifttbl \n"
69
70 ".su_cloop: \n" /* repeat for every column */
71 "mov %1,r2 \n" /* get start address */
72 "mov #0,r3 \n" /* current_plane = 0 */
73
74 ".su_oloop: \n" /* repeat for every bitplane */
75 "mov r2,r4 \n" /* get start address */
76 "mov #0,r5 \n" /* current_row = 0 */
77 "mov %5,r1 \n" /* get filler bits */
78
79 ".su_iloop: \n" /* repeat for all rows */
80 "sub %2,r4 \n" /* address -= width */
81 "mov.b @r4,r0 \n" /* get data byte */
82 "shll8 r1 \n" /* old data to 2nd byte */
83 "extu.b r0,r0 \n" /* extend unsigned */
84 "or r1,r0 \n" /* combine old data */
85 "jmp @%6 \n" /* jump into shift "path" */
86 "extu.b r0,r1 \n" /* store data for next round */
87
88 ".su_shift6: \n" /* shift right by 0..7 bits */
89 "shlr2 r0 \n"
90 ".su_shift4: \n"
91 "shlr2 r0 \n"
92 ".su_shift2: \n"
93 "bra .su_shift0 \n"
94 "shlr2 r0 \n"
95 ".su_shift7: \n"
96 "shlr2 r0 \n"
97 ".su_shift5: \n"
98 "shlr2 r0 \n"
99 ".su_shift3: \n"
100 "shlr2 r0 \n"
101 ".su_shift1: \n"
102 "shlr r0 \n"
103 ".su_shift0: \n"
104
105 "mov.b r0,@r4 \n" /* store data */
106 "add #1,r5 \n" /* current_row++ */
107 "cmp/hi r5,%3 \n" /* current_row < bheight ? */
108 "bt .su_iloop \n"
109
110 "add %4,r2 \n" /* start_address += plane_size */
111 "add #1,r3 \n" /* current_plane++ */
112 "cmp/hi r3,%0 \n" /* current_plane < depth ? */
113 "bt .su_oloop \n"
114
115 "add #1,%1 \n" /* start_address++ */
116 "add #1,r6 \n" /* x++ */
117 "cmp/hi r6,%2 \n" /* x < width ? */
118 "bt .su_cloop \n"
119 : /* outputs */
120 : /* inputs */
121 /* %0 */ "r"(_graybuf->depth),
122 /* %1 */ "r"(_graybuf->data + _graybuf->plane_size),
123 /* %2 */ "r"(_graybuf->width),
124 /* %3 */ "r"(_graybuf->bheight),
125 /* %4 */ "r"(_graybuf->plane_size),
126 /* %5 */ "r"(filler),
127 /* %6 */ "r"(count)
128 : /* clobbers */
129 "r0", "r1", "r2", "r3", "r4", "r5", "r6"
130 );
131}
132
133#endif // #ifdef HAVE_LCD_BITMAP
134#endif // #ifndef SIMULATOR
135
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