apps/plugins/pdbox/PDa/intern

/***************************************************************************
*             __________               __   ___.
*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
*                     \/            \/     \/    \/            \/
* $Id$
*
* New greyscale framework
* Core & miscellaneous functions
*
* This is a generic framework to display 129 shades of grey on low-depth
* bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins.
*
* Copyright (C) 2008 Jens Arnold
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/

#include "plugin.h"
#include "grey.h"

#if defined(HAVE_ADJUSTABLE_CPU_FREQ) && \
    (defined(CPU_PP) || (CONFIG_LCD == LCD_TL0350A))
#define NEED_BOOST
#endif

#ifndef SIMULATOR

#if defined ARCHOS_RECORDER     /* verified */  \
 || defined ARCHOS_FMRECORDER   /* should be identical */  \
 || defined ARCHOS_RECORDERV2   /* should be identical */  \
 || defined ARCHOS_ONDIOFM      /* verified */  \
 || defined ARCHOS_ONDIOSP      /* verified */
/* Average measurements of a Recorder v1, an Ondio FM, a backlight-modded 
 * Ondio FM, and an Ondio SP. */
static const unsigned char lcdlinear[256] = {
  5,   8,  10,  12,  14,  16,  18,  20,  22,  24,  26,  28,  29,  31,  33,  35,
 37,  39,  40,  42,  43,  45,  46,  48,  49,  50,  51,  53,  54,  55,  57,  58,
 59,  60,  61,  62,  63,  64,  65,  66,  67,  68,  68,  69,  70,  71,  71,  72,
 73,  74,  74,  75,  76,  77,  77,  78,  79,  79,  80,  80,  81,  81,  82,  82,
 83,  84,  84,  85,  86,  86,  87,  87,  88,  88,  89,  89,  90,  90,  91,  91,
 92,  92,  93,  93,  94,  94,  95,  95,  96,  96,  97,  98,  98,  99, 100, 100,
101, 101, 102, 103, 103, 104, 105, 105, 106, 106, 107, 107, 108, 108, 109, 109,
110, 110, 111, 112, 112, 113, 114, 114, 115, 115, 116, 117, 117, 118, 119, 119,
120, 120, 121, 122, 123, 123, 124, 125, 126, 126, 127, 128, 129, 129, 130, 131,
132, 132, 133, 134, 135, 135, 136, 137, 138, 138, 139, 140, 140, 141, 141, 142,
143, 144, 145, 146, 147, 147, 148, 149, 150, 151, 152, 153, 154, 154, 155, 156,
157, 158, 159, 160, 161, 161, 162, 163, 164, 165, 166, 167, 168, 168, 169, 170,
171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 184, 185, 186, 187,
188, 189, 191, 192, 194, 195, 197, 198, 199, 200, 202, 203, 204, 205, 207, 208,
209, 210, 212, 213, 215, 216, 218, 219, 220, 221, 222, 223, 225, 226, 227, 228,
229, 230, 232, 233, 234, 235, 237, 238, 239, 240, 242, 243, 244, 246, 247, 248
};
/* The actual LCD scanrate varies a lot with temperature on these targets */
#define LCD_SCANRATE 67 /* Hz */

#elif defined IAUDIO_M3         /* verified */
/* Average measurements of 2 iAudio remotes connected to an M3. */
static const unsigned char lcdlinear[256] = {
  5,   9,  13,  17,  21,  26,  30,  34,  38,  42,  46,  50,  54,  58,  62,  66,
 70,  73,  76,  78,  80,  82,  84,  86,  88,  90,  91,  92,  94,  95,  96,  97,
 98,  99,  99, 100, 101, 102, 102, 103, 104, 104, 105, 105, 106, 107, 107, 108,
109, 109, 110, 110, 111, 111, 112, 112, 113, 113, 114, 114, 115, 115, 116, 116,
117, 117, 118, 118, 119, 119, 120, 120, 121, 121, 121, 122, 122, 123, 123, 123,
124, 124, 124, 125, 125, 126, 126, 126, 127, 127, 127, 128, 128, 129, 129, 129,
130, 130, 131, 131, 132, 132, 133, 133, 134, 134, 134, 135, 135, 136, 136, 136,
137, 137, 137, 138, 138, 139, 139, 139, 140, 140, 141, 141, 142, 142, 143, 143,
144, 144, 145, 145, 146, 147, 147, 148, 149, 149, 150, 150, 151, 151, 152, 152,
153, 153, 154, 154, 155, 155, 156, 156, 157, 157, 158, 158, 159, 160, 160, 161,
162, 162, 163, 164, 164, 165, 166, 167, 168, 168, 169, 169, 170, 171, 171, 172,
173, 173, 174, 175, 176, 176, 177, 178, 179, 179, 180, 181, 182, 182, 183, 184,
185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 198, 199, 200, 201,
202, 203, 204, 205, 207, 208, 209, 210, 211, 212, 213, 214, 216, 217, 218, 219,
220, 221, 222, 223, 225, 226, 227, 228, 229, 230, 231, 232, 234, 235, 236, 237,
238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 249, 250, 251, 252
};
/* The actual LCD scanrate is 3x as high, but 150 Hz or 75 Hz cause a too high
 * CPU load (> 50 %). Even at 50Hz, greyscale display is rather smooth. Average
 * from 2 iAudio remotes. */
#define LCD_SCANRATE 50 /* Hz */

#elif defined IAUDIO_M5         /* verified */
/* Measurement of one iAudio M5L */
static const unsigned char lcdlinear[256] = {
  4,   6,   8,  10,  11,  13,  15,  17,  19,  21,  22,  24,  25,  27,  28,  30,
 32,  33,  35,  36,  37,  39,  40,  42,  43,  44,  45,  46,  48,  49,  50,  51,
 52,  52,  53,  54,  55,  55,  56,  57,  58,  58,  59,  60,  61,  61,  62,  63,
 64,  64,  65,  65,  66,  66,  67,  67,  68,  68,  69,  70,  70,  71,  72,  72,
 73,  73,  74,  75,  75,  76,  77,  77,  78,  78,  79,  79,  80,  80,  81,  81,
 82,  82,  83,  84,  84,  85,  86,  86,  87,  87,  88,  89,  89,  90,  91,  91,
 92,  92,  93,  93,  94,  94,  95,  95,  96,  96,  97,  98,  98,  99, 100, 100,
101, 101, 102, 102, 103, 103, 104, 104, 105, 105, 106, 106, 107, 107, 108, 108,
109, 109, 110, 110, 111, 111, 112, 112, 113, 113, 114, 114, 115, 115, 116, 116,
117, 117, 118, 119, 119, 120, 121, 121, 122, 122, 123, 124, 124, 125, 126, 126,
127, 127, 128, 129, 130, 130, 131, 132, 133, 133, 134, 135, 135, 136, 137, 137,
138, 139, 140, 141, 142, 142, 143, 144, 145, 146, 147, 148, 149, 149, 150, 151,
152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 163, 164, 165, 167, 168, 169,
170, 172, 173, 175, 177, 179, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198,
200, 202, 204, 205, 207, 209, 210, 212, 214, 216, 218, 219, 221, 223, 224, 226,
228, 230, 231, 233, 235, 236, 237, 239, 241, 243, 244, 246, 248, 249, 250, 252
};
#define LCD_SCANRATE 73 /* Hz */

#elif defined IPOD_1G2G         /* verified */
/* Average measurements of an iPod 1st Gen (0x00010001) and an iPod 2nd Gen
 * (0x00020000), measured with both backlight off & backlight on (flipped
 * curves) and medium load (white background when measuring with backlight on),
 * as the curve is load dependent (the controller's step-up converter doesn't
 * provide enough juice). Table is for backlight_off state. */
static const unsigned char lcdlinear[256] = {
  4,   6,   8,   9,  11,  13,  14,  16,  17,  18,  20,  21,  23,  24,  26,  27,
 29,  30,  31,  32,  34,  35,  36,  37,  38,  39,  40,  41,  41,  42,  43,  44,
 45,  45,  46,  47,  47,  48,  49,  49,  50,  50,  51,  51,  52,  52,  53,  53,
 54,  54,  54,  55,  55,  56,  56,  56,  57,  57,  57,  58,  58,  59,  59,  59,
 60,  60,  60,  61,  61,  62,  62,  62,  63,  63,  63,  64,  64,  65,  65,  65,
 66,  66,  67,  67,  68,  68,  69,  69,  70,  70,  71,  71,  72,  72,  73,  73,
 74,  74,  74,  75,  75,  76,  76,  76,  77,  77,  78,  78,  79,  79,  80,  80,
 81,  81,  82,  82,  83,  83,  84,  84,  85,  85,  86,  86,  87,  87,  88,  88,
 89,  89,  90,  91,  92,  92,  93,  94,  95,  95,  96,  97,  97,  98,  99,  99,
100, 100, 101, 102, 102, 103, 104, 104, 105, 105, 106, 107, 107, 108, 109, 109,
110, 110, 111, 112, 113, 113, 114, 115, 116, 116, 117, 118, 119, 119, 120, 121,
122, 122, 123, 124, 125, 125, 126, 127, 128, 129, 130, 131, 131, 132, 133, 134,
135, 137, 138, 139, 141, 142, 144, 145, 146, 147, 149, 150, 151, 152, 154, 155,
156, 158, 159, 161, 162, 164, 165, 167, 169, 171, 172, 174, 175, 177, 178, 180,
182, 184, 186, 188, 189, 191, 193, 195, 197, 199, 201, 203, 206, 208, 210, 212,
214, 217, 219, 221, 224, 226, 229, 231, 233, 236, 238, 240, 243, 245, 247, 250
};
/* Average from an iPod 1st Gen and an iPod 2nd Gen */
#define LCD_SCANRATE 96 /* Hz */

#elif defined IPOD_MINI2G       /* verified */  \
   || defined IPOD_MINI         /* should be identical */  \
   || defined IPOD_3G           /* TODO: verify */  \
   || defined IPOD_4G           /* TODO: verify */
/* Measurement of one iPod Mini G2 */
static const unsigned char lcdlinear[256] = {
  2,   5,   7,  10,  12,  15,  17,  20,  22,  24,  26,  28,  30,  32,  34,  36,
 38,  40,  41,  42,  44,  45,  46,  47,  48,  49,  50,  50,  51,  52,  52,  53,
 54,  54,  55,  55,  56,  56,  57,  57,  58,  58,  58,  59,  59,  60,  60,  60,
 61,  61,  61,  62,  62,  63,  63,  63,  64,  64,  64,  64,  65,  65,  65,  65,
 66,  66,  66,  66,  67,  67,  67,  67,  68,  68,  68,  68,  69,  69,  69,  69,
 70,  70,  70,  70,  71,  71,  71,  71,  72,  72,  72,  73,  73,  74,  74,  74,
 75,  75,  75,  75,  76,  76,  76,  76,  77,  77,  77,  78,  78,  79,  79,  79,
 80,  80,  80,  81,  81,  82,  82,  82,  83,  83,  83,  84,  84,  85,  85,  85,
 86,  86,  86,  87,  87,  88,  88,  88,  89,  89,  90,  90,  91,  91,  92,  92,
 93,  93,  94,  94,  95,  95,  96,  96,  97,  97,  98,  99,  99, 100, 101, 101,
102, 102, 103, 104, 104, 105, 106, 106, 107, 108, 109, 110, 110, 111, 112, 113,
114, 115, 115, 116, 117, 118, 118, 119, 120, 121, 121, 122, 123, 124, 124, 125,
126, 127, 128, 129, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140,
141, 142, 143, 144, 146, 147, 148, 149, 150, 151, 153, 154, 155, 156, 158, 159,
160, 162, 163, 165, 166, 168, 169, 171, 172, 175, 177, 180, 182, 185, 187, 190,
192, 196, 199, 203, 206, 210, 213, 217, 220, 223, 227, 230, 234, 238, 242, 246
};
/* Average of an iPod Mini G2 and 2 3rd Gen iPods. */
#define LCD_SCANRATE 87 /* Hz */

#elif defined IRIVER_H100_SERIES /* verified */
/* Measurement of one Iriver H140 */
static const unsigned char lcdlinear[256] = {
  5,   8,  12,  15,  18,  22,  25,  28,  31,  34,  36,  39,  42,  44,  47,  50,
 53,  55,  57,  59,  62,  64,  66,  68,  70,  71,  72,  73,  75,  76,  77,  78,
 79,  80,  80,  81,  82,  83,  83,  84,  85,  85,  86,  86,  87,  87,  88,  88,
 89,  89,  90,  90,  91,  91,  92,  92,  93,  93,  93,  94,  94,  95,  95,  95,
 96,  96,  96,  97,  97,  98,  98,  98,  99,  99,  99, 100, 100, 101, 101, 101,
102, 102, 102, 103, 103, 104, 104, 104, 105, 105, 106, 106, 107, 107, 108, 108,
109, 109, 109, 110, 110, 111, 111, 111, 112, 112, 113, 113, 114, 114, 115, 115,
116, 116, 117, 117, 118, 118, 119, 119, 120, 120, 121, 121, 122, 122, 123, 123,
124, 124, 125, 125, 126, 127, 127, 128, 129, 129, 130, 130, 131, 131, 132, 132,
133, 133, 134, 135, 135, 136, 137, 137, 138, 138, 139, 139, 140, 140, 141, 141,
142, 142, 143, 143, 144, 145, 145, 146, 147, 147, 148, 148, 149, 150, 150, 151,
152, 152, 153, 153, 154, 155, 155, 156, 157, 157, 158, 159, 160, 160, 161, 162,
163, 164, 165, 166, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
178, 179, 181, 182, 183, 184, 186, 187, 188, 189, 191, 192, 193, 194, 196, 197,
198, 200, 202, 203, 205, 207, 208, 210, 212, 214, 215, 217, 218, 220, 221, 223,
224, 226, 228, 229, 231, 233, 235, 236, 238, 240, 241, 242, 244, 245, 246, 248
};
#define LCD_SCANRATE 70 /* Hz */

#elif defined MROBE_100 /* verified */
/* Average measurements of 2 m:robe 100 s */
static const unsigned char lcdlinear[256] = {
 10,  14,  18,  22,  26,  30,  34,  38,  42,  46,  49,  53,  56,  60,  63,  67,
 70,  73,  76,  79,  81,  84,  87,  90,  92,  95,  97, 100, 102, 105, 107, 110,
112, 114, 116, 118, 119, 121, 123, 125, 126, 128, 130, 131, 133, 135, 136, 138,
139, 141, 142, 143, 144, 146, 147, 148, 149, 150, 151, 152, 154, 155, 156, 157,
158, 159, 160, 161, 161, 162, 163, 164, 165, 166, 167, 168, 168, 169, 170, 171,
172, 172, 173, 173, 174, 174, 175, 175, 176, 176, 177, 178, 178, 179, 180, 180,
181, 181, 182, 182, 183, 183, 184, 184, 185, 185, 186, 186, 187, 187, 188, 188,
189, 189, 190, 190, 191, 191, 192, 192, 193, 193, 193, 194, 194, 195, 195, 195,
196, 196, 197, 197, 198, 198, 199, 199, 200, 200, 200, 201, 201, 202, 202, 202,
203, 203, 204, 204, 205, 205, 206, 206, 207, 207, 207, 208, 208, 209, 209, 209,
210, 210, 210, 211, 211, 212, 212, 212, 213, 213, 213, 214, 214, 215, 215, 215,
216, 216, 216, 217, 217, 218, 218, 218, 219, 219, 219, 220, 220, 221, 221, 221,
222, 222, 222, 223, 223, 224, 224, 224, 225, 225, 225, 226, 226, 227, 227, 227,
228, 228, 229, 229, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234, 234,
235, 235, 235, 236, 236, 237, 237, 237, 238, 238, 238, 239, 239, 240, 240, 240,
241, 241, 242, 242, 243, 243, 244, 244, 247, 248, 248, 249, 250, 250, 251, 252
};
#define LCD_SCANRATE 51 /* Hz */

#else  /* not yet calibrated targets - generic linear mapping */
/* TODO: calibrate iFP7xx */
static const unsigned char lcdlinear[256] = {
  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,  15,
 16,  17,  18,  19,  20,  21,  22,  23,  24,  25,  26,  27,  28,  29,  30,  31,
 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
};
/* generic default */
#define LCD_SCANRATE 70 /* Hz */

#endif
#else /* SIMULATOR */
/* undo a (generic) PC display gamma of 2.0 to simulate target behaviour */
static const unsigned char lcdlinear[256] = {
  0,  16,  23,  28,  32,  36,  39,  42,  45,  48,  50,  53,  55,  58,  60,  62,
 64,  66,  68,  70,  71,  73,  75,  77,  78,  80,  81,  83,  84,  86,  87,  89,
 90,  92,  93,  94,  96,  97,  98, 100, 101, 102, 103, 105, 106, 107, 108, 109,
111, 112, 113, 114, 115, 116, 117, 118, 119, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 135, 136, 137, 138, 139, 140, 141, 142,
143, 144, 145, 145, 146, 147, 148, 149, 150, 151, 151, 152, 153, 154, 155, 156,
156, 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167, 167, 168,
169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176, 177, 178, 179, 179, 180,
181, 181, 182, 183, 183, 184, 185, 186, 186, 187, 188, 188, 189, 190, 190, 191,
192, 192, 193, 194, 194, 195, 196, 196, 197, 198, 198, 199, 199, 200, 201, 201,
202, 203, 203, 204, 204, 205, 206, 206, 207, 208, 208, 209, 209, 210, 211, 211,
212, 212, 213, 214, 214, 215, 215, 216, 217, 217, 218, 218, 219, 220, 220, 221,
221, 222, 222, 223, 224, 224, 225, 225, 226, 226, 227, 228, 228, 229, 229, 230,
230, 231, 231, 232, 233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238,
239, 240, 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 247,
247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255
};
#endif /* SIMULATOR */

/* Prototypes */
static inline void _deferred_update(void) __attribute__ ((always_inline));
static int exp_s16p16(int x);
static int log_s16p16(int x);
static void grey_screendump_hook(int fd);
static void fill_gvalues(void);
#ifdef SIMULATOR
static unsigned long _grey_get_pixel(int x, int y);
#else
static void _timer_isr(void);
#endif


#if defined(HAVE_BACKLIGHT_INVERSION) && !defined(SIMULATOR)
static void invert_gvalues(void)
{
    unsigned char *val, *end;
    unsigned char rev_tab[256];
    unsigned i;
    unsigned last_i = 0;
    unsigned x = 0;
    unsigned last_x;
    
    /* Step 1: Calculate a transposed table for undoing the old mapping */
    for (i = 0; i < 256; i++)
    {
        last_x = x;
        x = _grey_info.gvalue[i];
        if (x > last_x)
        {
            rev_tab[last_x++] = (last_i + i) / 2;
            while (x > last_x)
                rev_tab[last_x++] = i;
            last_i = i;
        }
    }
    rev_tab[last_x++] = (last_i + 255) / 2;
    while (256 > last_x)
        rev_tab[last_x++] = 255;

    /* Step 2: Calculate new mapping */
    fill_gvalues();

    /* Step 3: Transpose all pixel values */
    val = _grey_info.values;
    end = val + _GREY_MULUQ(_grey_info.width, _grey_info.height);

    do
        *val = _grey_info.gvalue[rev_tab[*val]];
    while (++val < end);
}
#endif

/* Update LCD areas not covered by the greyscale overlay */
static inline void _deferred_update(void)
{
    int x1 = MAX(_grey_info.x, 0);
    int x2 = MIN(_grey_info.x + _grey_info.width, LCD_WIDTH);
    int y1 = MAX(_grey_info.y, 0);
    int y2 = MIN(_grey_info.y + _grey_info.height, LCD_HEIGHT);

    if (y1 > 0)  /* refresh part above overlay, full width */
        _grey_info.rb->lcd_update_rect(0, 0, LCD_WIDTH, y1);

    if (y2 < LCD_HEIGHT) /* refresh part below overlay, full width */
        _grey_info.rb->lcd_update_rect(0, y2, LCD_WIDTH, LCD_HEIGHT - y2);

    if (x1 > 0) /* refresh part to the left of overlay */
        _grey_info.rb->lcd_update_rect(0, y1, x1, y2 - y1);

    if (x2 < LCD_WIDTH) /* refresh part to the right of overlay */
        _grey_info.rb->lcd_update_rect(x2, y1, LCD_WIDTH - x2, y2 - y1);
}

#ifdef SIMULATOR

/* Callback function for grey_ub_gray_bitmap_part() to read a pixel from the
 * greybuffer. Note that x and y are in LCD coordinates, not greybuffer
 * coordinates! */
static unsigned long _grey_get_pixel(int x, int y)
{
    int xg = x - _grey_info.x;
    int yg = y - _grey_info.y;
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
    int idx = _grey_info.width * yg + xg;
#else /* vertical packing or vertical interleaved */
    int idx = _grey_info.width * (yg & ~_GREY_BMASK) 
            + (xg << _GREY_BSHIFT) + (~yg & _GREY_BMASK);
#endif

    return _grey_info.values[idx] + (1 << LCD_DEPTH);
}

#else /* !SIMULATOR */

/* Timer interrupt handler: display next frame */
static void _timer_isr(void)
{
#if defined(HAVE_BACKLIGHT_INVERSION) && !defined(SIMULATOR)
    unsigned long check = _grey_info.rb->is_backlight_on(true) 
                        ? 0 : _GREY_BACKLIGHT_ON;
    
    if ((_grey_info.flags & (_GREY_BACKLIGHT_ON|GREY_RAWMAPPED)) == check)
    {
        _grey_info.flags ^= _GREY_BACKLIGHT_ON;
        invert_gvalues();
        return; /* don't overload this timer slot */
    }
#endif
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
    _grey_info.rb->lcd_blit_grey_phase(_grey_info.values, _grey_info.phases,
                                       _grey_info.bx, _grey_info.y,
                                       _grey_info.bwidth, _grey_info.height,
                                       _grey_info.width);
#else /* vertical packing or vertical interleaved */
    _grey_info.rb->lcd_blit_grey_phase(_grey_info.values, _grey_info.phases,
                                       _grey_info.x, _grey_info.by,
                                       _grey_info.width, _grey_info.bheight,
                                       _grey_info.width);
#endif

    if (_grey_info.flags & _GREY_DEFERRED_UPDATE) /* lcd_update() requested? */
    {
        _deferred_update();
        _grey_info.flags &= ~_GREY_DEFERRED_UPDATE; /* clear request */
    }
}

#endif /* !SIMULATOR */

/* fixed point exp() */
static int exp_s16p16(int x)
{
    int t;
    int y = 0x00010000;

    if (x < 0) x += 0xb1721,            y >>= 16;
    t = x - 0x58b91; if (t >= 0) x = t, y <<= 8;
    t = x - 0x2c5c8; if (t >= 0) x = t, y <<= 4;
    t = x - 0x162e4; if (t >= 0) x = t, y <<= 2;
Mode	Name	Size
-rw-r--r--	biquad~.c	3679	log plain
-rw-r--r--	bp~.c	3537	log plain
-rw-r--r--	clip~.c	1283	log plain
-rw-r--r--	cos_table.c	343788	log plain
-rw-r--r--	cos_table.h	239	log plain
-rw-r--r--	cos~.c	1753	log plain
-rw-r--r--	dbtopow~.c	1354	log plain
-rw-r--r--	dbtorms~.c	1356	log plain
-rw-r--r--	delay.h	933	log plain
-rw-r--r--	delread~.c	3099	log plain
-rw-r--r--	delwrite~.c	2339	log plain
-rw-r--r--	env~.c	3604	log plain
-rw-r--r--	ftom~.c	1357	log plain
-rw-r--r--	hip~.c	2200	log plain
-rw-r--r--	intern_setup.c	2566	log plain
-rw-r--r--	line~.c	2431	log plain
-rw-r--r--	lop~.c	2151	log plain
-rw-r--r--	makefile	354	log plain
-rw-r--r--	mtof~.c	1324	log plain
-rw-r--r--	noise~.c	1097	log plain
-rw-r--r--	osc~.c	2159	log plain
-rw-r--r--	phasor~.c	1731	log plain
-rw-r--r--	powtodb~.c	1354	log plain
-rw-r--r--	print~.c	1743	log plain
-rw-r--r--	rmstodb~.c	1349	log plain
-rw-r--r--	rsqrt~.c	3194	log plain
-rw-r--r--	samphold~.c	1905	log plain
-rw-r--r--	sformat.h	1965	log plain
-rw-r--r--	sfread~.c	6640	log plain
-rw-r--r--	sfwrite~.c	5706	log plain
-rw-r--r--	snapshot~.c	1391	log plain
-rw-r--r--	sqrt~.c	2097	log plain
-rw-r--r--	tabosc4~.c	3344	log plain
-rw-r--r--	tabplay~.c	3419	log plain
-rw-r--r--	tabread.c	1331	log plain
-rw-r--r--	tabread4~.c	2592	log plain
-rw-r--r--	tabread~.c	2469	log plain
-rw-r--r--	tabreceive~.c	1529	log plain
-rw-r--r--	tabsend~.c	2378	log plain
-rw-r--r--	tabwrite.c	2150	log plain
-rw-r--r--	tabwrite~.c	3344	log plain
-rw-r--r--	threshold~.c	4223	log plain
-rw-r--r--	vcf~.c	3310	log plain
-rw-r--r--	vd~.c	2547	log plain
-rw-r--r--	vline~.c	4998	log plain
-rw-r--r--	vsnapshot~.c	2082	log plain
-rw-r--r--	wrap~.c	1107	log plain