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authorJens Arnold <amiconn@rockbox.org>2005-07-25 20:50:34 +0000
committerJens Arnold <amiconn@rockbox.org>2005-07-25 20:50:34 +0000
commitc20a00ef3e35b15acf422a2e7f6716abde840c24 (patch)
tree903cf122a1203360022dad4a06cc24b7ea805463 /apps/plugins/lib/gray_scroll_down.c
parent12a4ed383f21b65a5a244f47fe1bc9f13d4f63bb (diff)
downloadrockbox-c20a00ef3e35b15acf422a2e7f6716abde840c24.tar.gz
rockbox-c20a00ef3e35b15acf422a2e7f6716abde840c24.zip
Complete rework of the grayscale library: (1) Implemented the new rockbox graphics api. (2) Added buffered mode, and implemented most drawing functions for buffered mode only. Buffered mode will ease implementation of animated graphics. Some functions are additionally provided as unbuffered versions (drawing grayscale bitmaps, scrolling) since unbuffered mode is better suited for non-animated graphics (JPEG viewer, mandelbrot) and saves some RAM, which is important on Archos. (3) Put all functions in a couple of source files, no more one-function-per-files. This became possible since sectioned compilation for the plugin library and appropriate linking for the pluginswas introduced, otherwise the binaries would be bloated by unused functions.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7241 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/lib/gray_scroll_down.c')
-rw-r--r--apps/plugins/lib/gray_scroll_down.c134
1 files changed, 0 insertions, 134 deletions
diff --git a/apps/plugins/lib/gray_scroll_down.c b/apps/plugins/lib/gray_scroll_down.c
deleted file mode 100644
index 1fb1de8335..0000000000
--- a/apps/plugins/lib/gray_scroll_down.c
+++ /dev/null
@@ -1,134 +0,0 @@
1/***************************************************************************
2* __________ __ ___.
3* Open \______ \ ____ ____ | | _\_ |__ _______ ___
4* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7* \/ \/ \/ \/ \/
8* $Id$
9*
10* Grayscale framework
11* gray_scroll_down() 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 down by <count> pixels (<= 7)
34 ----------------------------------------------------------------------------
35 black_border determines if the pixels scrolled in at the top 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_down(int count, bool black_border)
43{
44 unsigned filler;
45
46 if ((unsigned) count > 7)
47 return;
48
49 filler = black_border ? (0xFFu << count) : 0;
50
51 /* scroll column by column to minimize flicker */
52 asm volatile (
53 "mov #0,r6 \n" /* x = 0 */
54 "mova .sd_shifttbl,r0 \n" /* calculate jump destination for */
55 "mov.b @(r0,%6),%6 \n" /* shift amount from table */
56 "bra .sd_cloop \n" /* skip table */
57 "add r0,%6 \n"
58
59 ".align 2 \n"
60 ".sd_shifttbl: \n" /* shift jump offset table */
61 ".byte .sd_shift0 - .sd_shifttbl \n"
62 ".byte .sd_shift1 - .sd_shifttbl \n"
63 ".byte .sd_shift2 - .sd_shifttbl \n"
64 ".byte .sd_shift3 - .sd_shifttbl \n"
65 ".byte .sd_shift4 - .sd_shifttbl \n"
66 ".byte .sd_shift5 - .sd_shifttbl \n"
67 ".byte .sd_shift6 - .sd_shifttbl \n"
68 ".byte .sd_shift7 - .sd_shifttbl \n"
69
70 ".sd_cloop: \n" /* repeat for every column */
71 "mov %1,r2 \n" /* get start address */
72 "mov #0,r3 \n" /* current_plane = 0 */
73
74 ".sd_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 ".sd_iloop: \n" /* repeat for all rows */
80 "shlr8 r1 \n" /* shift right to get residue */
81 "mov.b @r4,r0 \n" /* get data byte */
82 "jmp @%6 \n" /* jump into shift "path" */
83 "extu.b r0,r0 \n" /* extend unsigned */
84
85 ".sd_shift6: \n" /* shift left by 0..7 bits */
86 "shll2 r0 \n"
87 ".sd_shift4: \n"
88 "shll2 r0 \n"
89 ".sd_shift2: \n"
90 "bra .sd_shift0 \n"
91 "shll2 r0 \n"
92 ".sd_shift7: \n"
93 "shll2 r0 \n"
94 ".sd_shift5: \n"
95 "shll2 r0 \n"
96 ".sd_shift3: \n"
97 "shll2 r0 \n"
98 ".sd_shift1: \n"
99 "shll r0 \n"
100 ".sd_shift0: \n"
101
102 "or r0,r1 \n" /* combine with last residue */
103 "mov.b r1,@r4 \n" /* store data */
104 "add %2,r4 \n" /* address += width */
105 "add #1,r5 \n" /* current_row++ */
106 "cmp/hi r5,%3 \n" /* current_row < bheight ? */
107 "bt .sd_iloop \n"
108
109 "add %4,r2 \n" /* start_address += plane_size */
110 "add #1,r3 \n" /* current_plane++ */
111 "cmp/hi r3,%0 \n" /* current_plane < depth ? */
112 "bt .sd_oloop \n"
113
114 "add #1,%1 \n" /* start_address++ */
115 "add #1,r6 \n" /* x++ */
116 "cmp/hi r6,%2 \n" /* x < width ? */
117 "bt .sd_cloop \n"
118 : /* outputs */
119 : /* inputs */
120 /* %0 */ "r"(_graybuf->depth),
121 /* %1 */ "r"(_graybuf->data),
122 /* %2 */ "r"(_graybuf->width),
123 /* %3 */ "r"(_graybuf->bheight),
124 /* %4 */ "r"(_graybuf->plane_size),
125 /* %5 */ "r"(filler),
126 /* %6 */ "r"(count)
127 : /* clobbers */
128 "r0", "r1", "r2", "r3", "r4", "r5", "r6"
129 );
130}
131
132#endif // #ifdef HAVE_LCD_BITMAP
133#endif // #ifndef SIMULATOR
134
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