/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 Zakk Roberts * * 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 "lib/oldmenuapi.h" #include "lib/helper.h" PLUGIN_HEADER /*** * FIREWORKS.C by ZAKK ROBERTS * Rockbox plugin simulating a fireworks display. * Supports all bitmap LCDs, fully scalable. * Currently disabled for Archos Recorder - runs too slow. ***/ /* All sorts of keymappings.. */ #if (CONFIG_KEYPAD == IRIVER_H300_PAD) || (CONFIG_KEYPAD == IRIVER_H100_PAD) #define BTN_MENU BUTTON_OFF #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \ (CONFIG_KEYPAD == IPOD_1G2G_PAD) #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == RECORDER_PAD) #define BTN_MENU BUTTON_OFF #define BTN_FIRE BUTTON_PLAY #elif (CONFIG_KEYPAD == ARCHOS_AV300_PAD) #define BTN_MENU BUTTON_OFF #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == ONDIO_PAD) #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_UP #elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD) #define BTN_MENU BUTTON_POWER #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == IRIVER_IFP7XX_PAD) #define BTN_MENU BUTTON_MODE #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == GIGABEAT_PAD) || \ (CONFIG_KEYPAD == GIGABEAT_S_PAD) || \ (CONFIG_KEYPAD == MROBE100_PAD) #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \ (CONFIG_KEYPAD == SANSA_C200_PAD) #define BTN_MENU BUTTON_POWER #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == SANSA_FUZE_PAD) #define BTN_MENU BUTTON_DOWN #define BTN_FIRE BUTTON_SELECT #elif (CONFIG_KEYPAD == IRIVER_H10_PAD) #define BTN_MENU BUTTON_POWER #define BTN_FIRE BUTTON_PLAY #elif CONFIG_KEYPAD == IAUDIO_M3_PAD #define BTN_MENU BUTTON_RC_REC #define BTN_FIRE BUTTON_RC_PLAY #elif (CONFIG_KEYPAD == COWOND2_PAD) #define BTN_MENU (BUTTON_MENU|BUTTON_REL) #elif CONFIG_KEYPAD == IAUDIO67_PAD #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_PLAY #elif CONFIG_KEYPAD == CREATIVEZVM_PAD #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_SELECT #elif CONFIG_KEYPAD == PHILIPS_HDD1630_PAD #define BTN_MENU BUTTON_MENU #define BTN_FIRE BUTTON_SELECT #else #error No keymap defined! #endif #ifdef HAVE_TOUCHSCREEN #ifndef BTN_MENU #define BTN_MENU (BUTTON_TOPLEFT|BUTTON_REL) #endif #ifndef BTN_FIRE #define BTN_FIRE BUTTON_CENTER #endif #endif /* The lowdown on source terminology: * a ROCKET is launched from the LCD bottom. * FIREWORKs are ejected from the rocket when it explodes. */ #define MAX_ROCKETS 40 #define ROCKET_LIFE (LCD_HEIGHT/2) #define ROCKET_LIFE_VAR (LCD_HEIGHT/4) #define ROCKET_SIZE 2 #define ROCKET_MOVEMENT_RANGE 4 #define ROCKET_TRAIL_PARTICLES 50 #define MAX_FIREWORKS 40 #define FIREWORK_MOVEMENT_RANGE 6 #define FIREWORK_SIZE 2 /* position, speed, "phase" (age), color of all fireworks */ int firework_xpoints[MAX_ROCKETS+1][MAX_FIREWORKS]; int firework_ypoints[MAX_ROCKETS+1][MAX_FIREWORKS]; int firework_xspeed[MAX_ROCKETS+1][MAX_FIREWORKS]; int firework_yspeed[MAX_ROCKETS+1][MAX_FIREWORKS]; int firework_phase[MAX_ROCKETS+1]; #ifdef HAVE_LCD_COLOR int firework_color[MAX_ROCKETS+1][MAX_FIREWORKS]; #endif /* position, speed, "phase" (age) of all rockets */ int rocket_xpos[MAX_ROCKETS+1]; int rocket_ypos[MAX_ROCKETS+1]; int rocket_xspeed[MAX_ROCKETS+1]; int rocket_yspeed[MAX_ROCKETS+1]; int rocket_phase[MAX_ROCKETS+1]; int rocket_targetphase[MAX_ROCKETS+1]; /* settings values. these should eventually be saved to * disk. maybe a preset loading/saving system? */ int autofire_delay = 0; int particles_per_firework = 2; int particle_life = 1; int gravity = 1; int show_rockets = 1; int frames_per_second = 4; bool quit_plugin = false; /* firework colors: * firework_colors = brightest firework color, used most of the time. * DARK colors = fireworks are nearly burnt out. * DARKER colors = fireworks are several frames away from burning out. * DARKEST colors = fireworks are a couple frames from burning out. */ #ifdef HAVE_LCD_COLOR static const unsigned firework_colors[] = { LCD_RGBPACK(0,255,64), LCD_RGBPACK(61,255,249), LCD_RGBPACK(255,200,61), LCD_RGBPACK(217,22,217), LCD_RGBPACK(22,217,132), LCD_RGBPACK(67,95,254), LCD_RGBPACK(151,84,213) }; static const unsigned firework_dark_colors[] = { LCD_RGBPACK(0,128,32), LCD_RGBPACK(30,128,128), LCD_RGBPACK(128,100,30), LCD_RGBPACK(109,11,109), LCD_RGBPACK(11,109,66), LCD_RGBPACK(33,47,128), LCD_RGBPACK(75,42,105) }; static const unsigned firework_darker_colors[] = { LCD_RGBPACK(0,64,16), LCD_RGBPACK(15,64,64), LCD_RGBPACK(64,50,15), LCD_RGBPACK(55,5,55), LCD_RGBPACK(5,55,33), LCD_RGBPACK(16,24,64), LCD_RGBPACK(38,21,52) }; static const unsigned firework_darkest_colors[] = { LCD_RGBPACK(0,32,8), LCD_RGBPACK(7,32,32), LCD_RGBPACK(32,25,7), LCD_RGBPACK(27,2,27), LCD_RGBPACK(2,27,16), LCD_RGBPACK(8,12,32), LCD_RGBPACK(19,10,26) }; #define EXPLOSION_COLOR LCD_RGBPACK(255,240,0) #endif static const struct opt_items autofire_delay_settings[15] = { { "Off", -1 }, { "50ms", -1 }, { "100ms", -1 }, { "200ms", -1 }, { "300ms", -1 }, { "400ms", -1 }, { "500ms", -1 }, { "600ms", -1 }, { "700ms", -1 }, { "800ms", -1 }, { "900ms", -1 }, { "1s", -1 }, { "2s", -1 }, { "3s", -1 }, { "4s", -1 } }; int autofire_delay_values[15] = { 0, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400 }; static const struct opt_items particle_settings[8] = { { "5", -1 }, { "10", -1 }, { "15", -1 }, { "20", -1 }, { "25", -1 }, { "30", -1 }, { "35", -1 }, { "40", -1 }, }; int particle_values[8] = { 5, 10, 15, 20, 25, 30, 35, 40 }; static const struct opt_items particle_life_settings[9] = { { "20 cycles", -1 }, { "30 cycles", -1 }, { "40 cycles", -1 }, { "50 cycles", -1 }, { "60 cycles", -1 }, { "70 cycles", -1 }, { "80 cycles", -1 }, { "90 cycles", -1 }, { "100 cycles", -1 } }; int particle_life_values[9] = { 20, 30, 40, 50, 60, 70, 80, 90, 100 }; static const struct opt_items gravity_settings[4] = { { "Off", -1 }, { "Weak", -1 }, { "Moderate", -1 }, { "Strong", -1 }, }; int gravity_values[4] = { 0, 30, 20, 10 }; #ifdef HAVE_LCD_COLOR static const struct opt_items rocket_settings[3] = { { "No", -1 }, { "Yes (no trails)", -1 }, { "Yes (with trails)", -1 }, }; int rocket_values[4] = { 2, 1, 0 }; #else static const struct opt_items rocket_settings[2] = { { "No", -1 }, { "Yes", -1 }, }; int rocket_values[4] = { 1, 0 }; #endif static const struct opt_items fps_settings[9] = { { "20 FPS", -1 }, { "25 FPS", -1 }, { "30 FPS", -1 }, { "35 FPS", -1 }, { "40 FPS", -1 }, { "45 FPS", -1 }, { "50 FPS", -1 }, { "55 FPS", -1 }, { "60 FPS", -1 } }; int fps_values[9] = { 20, 25, 30, 35, 40, 45, 50, 55, 60 }; static const struct menu_item items[] = { { "Start Demo", NULL }, { "Auto-Fire", NULL }, { "Particles Per Firework", NULL }, { "Particle Life", NULL }, { "Gravity", NULL }, { "Show Rockets", NULL }, { "FPS (Speed)", NULL }, { "Quit", NULL } }; /* called on startup. initializes all variables, etc */ void init_all(void) { int j; for(j=0; jsrand(*rb->current_tick * i); firework_xpoints[firework][i] = x; firework_ypoints[firework][i] = y; firework_xspeed[firework][i] = (rb->rand() % FIREWORK_MOVEMENT_RANGE) - FIREWORK_MOVEMENT_RANGE/2; firework_yspeed[firework][i] = (rb->rand() % FIREWORK_MOVEMENT_RANGE) - FIREWORK_MOVEMENT_RANGE/2; #ifdef HAVE_LCD_COLOR firework_color[firework][i] = rb->rand() % 7; #endif } } /* called when a rocket is launched. * prepares said rocket to start moving towards its destination. */ void init_rocket(int rocket) { rb->srand(*rb->current_tick); rocket_xpos[rocket] = rb->rand() % LCD_WIDTH; rocket_ypos[rocket] = LCD_HEIGHT; rocket_xspeed[rocket] = (rb->rand() % ROCKET_MOVEMENT_RANGE) - ROCKET_MOVEMENT_RANGE/2; rocket_yspeed[rocket] = 3; rocket_targetphase[rocket] = (ROCKET_LIFE + (rb->rand() % ROCKET_LIFE_VAR)) / rocket_yspeed[rocket]; } /* startup/configuration menu. */ void fireworks_menu(void) { int m, result; bool menu_quit = false; rb->lcd_setfont(FONT_UI); #ifdef HAVE_LCD_COLOR rb->lcd_set_background(LCD_BLACK); rb->lcd_set_foreground(LCD_WHITE); #endif rb->lcd_clear_display(); rb->lcd_update(); m = menu_init(items, sizeof(items) / sizeof(*items), NULL, NULL, NULL, NULL); rb->button_clear_queue(); while(!menu_quit) { result = menu_show(m); switch(result) { case 0: rb->lcd_setfont(FONT_SYSFIXED); #ifdef HAVE_LCD_COLOR rb->lcd_set_background(LCD_BLACK); rb->lcd_set_foreground(LCD_WHITE); #endif rb->lcd_clear_display(); rb->lcd_update(); init_all(); menu_quit = true; break; case 1: rb->set_option("Auto-Fire", &autofire_delay, INT, autofire_delay_settings, 15, NULL); break; case 2: rb->set_option("Particles Per Firework", &particles_per_firework, INT, particle_settings, 8, NULL); break; case 3: rb->set_option("Particle Life", &particle_life, INT, particle_life_settings, 9, NULL); break; case 4: rb->set_option("Gravity", &gravity, INT, gravity_settings, 4, NULL); break; case 5: rb->set_option("Show Rockets", &show_rockets, INT, rocket_settings, 3, NULL); break; case 6: rb->set_option("FPS (Speed)", &frames_per_second, INT, fps_settings, 9, NULL); break; case 7: quit_plugin = true; menu_quit = true; break; } } menu_exit(m); } /* this is the plugin entry point */ enum plugin_status plugin_start(const void* parameter) { (void)parameter; int j, i, autofire=0; int thisrocket=0; int start_tick, elapsed_tick; int button; /* set everything up.. no BL timeout, no backdrop, white-text-on-black-background. */ backlight_force_on(); /* backlight control in lib/helper.c */ #if LCD_DEPTH > 1 rb->lcd_set_backdrop(NULL); rb->lcd_set_background(LCD_BLACK); rb->lcd_set_foreground(LCD_WHITE); #endif #ifdef HAVE_ADJUSTABLE_CPU_FREQ rb->cpu_boost(true); #endif fireworks_menu(); start_tick = *rb->current_tick; while(!quit_plugin) { rb->lcd_clear_display(); /* loop through every possible rocket */ for(j=0; j -1) { #ifdef HAVE_LCD_COLOR /* draw trail, if requested */ if(show_rockets==2) { rb->lcd_set_foreground(LCD_RGBPACK(128,128,128)); rb->lcd_fillrect(rocket_xpos[j], rocket_ypos[j], ROCKET_SIZE, ROCKET_SIZE); rb->lcd_set_foreground(LCD_RGBPACK(64,64,64)); rb->lcd_fillrect(rocket_xpos[j]-rocket_xspeed[j], rocket_ypos[j]+rocket_yspeed[j], ROCKET_SIZE, ROCKET_SIZE); } #endif /* move rocket */ rocket_xpos[j] += rocket_xspeed[j]; rocket_ypos[j] -= rocket_yspeed[j]; #ifdef HAVE_LCD_COLOR rb->lcd_set_foreground(LCD_WHITE); #endif if(show_rockets==2 || show_rockets==1) rb->lcd_fillrect(rocket_xpos[j], rocket_ypos[j], ROCKET_SIZE, ROCKET_SIZE); /* if(rocket isn't "there" yet) keep moving * if(rocket IS there) explode it. */ if(rocket_phase[j] < rocket_targetphase[j]) rocket_phase[j]++; else { rocket_phase[j] = -1; firework_phase[j] = 0; init_explode(rocket_xpos[j], rocket_ypos[j], j, particle_values[particles_per_firework]); } } /* and now onto the fireworks for this particular rocket... */ if(firework_phase[j] > -1) { for(i=0; ilcd_set_foreground(firework_darkest_colors[firework_color[j][i]]); rb->lcd_fillrect(firework_xpoints[j][i]-1, firework_ypoints[j][i]-1, FIREWORK_SIZE+2, FIREWORK_SIZE+2); if(firework_phase[j] < particle_life_values[particle_life]-10) rb->lcd_set_foreground(firework_colors[firework_color[j][i]]); else if(firework_phase[j] < particle_life_values[particle_life]-7) rb->lcd_set_foreground(firework_dark_colors[firework_color[j][i]]); else if(firework_phase[j] < particle_life_values[particle_life]-3) rb->lcd_set_foreground(firework_darker_colors[firework_color[j][i]]); else rb->lcd_set_foreground(firework_darkest_colors[firework_color[j][i]]); #endif rb->lcd_fillrect(firework_xpoints[j][i], firework_ypoints[j][i], FIREWORK_SIZE, FIREWORK_SIZE); /* WIP - currently ugly explosion effect #ifdef HAVE_LCD_COLOR if(firework_phase[j] < 10) { rb->lcd_set_foreground(EXPLOSION_COLOR); rb->lcd_fillrect(rocket_xpos[j]-firework_phase[j], rocket_ypos[j]-firework_phase[j], firework_phase[j]*2, firework_phase[j]*2); } #endif */ } #ifdef HAVE_LCD_COLOR rb->lcd_set_foreground(LCD_WHITE); #endif /* firework at its destination age? * no = keep aging; yes = delete it. */ if(firework_phase[j] < particle_life_values[particle_life]) firework_phase[j]++; else firework_phase[j] = -1; } } /* is autofire on? */ if(autofire_delay != 0) { elapsed_tick = *rb->current_tick - start_tick; if(elapsed_tick > autofire_delay_values[autofire_delay]) { rocket_phase[autofire] = 0; init_rocket(autofire); start_tick = *rb->current_tick; if(autofire < MAX_ROCKETS) autofire++; else autofire = 0; } } rb->lcd_update(); button = rb->button_get_w_tmo(HZ/fps_values[frames_per_second]); switch(button) { case BTN_MENU: /* back to config menu */ fireworks_menu(); break; case BTN_FIRE: /* fire off rockets manually */ case BTN_FIRE|BUTTON_REPEAT: if(thisrocket < MAX_ROCKETS) thisrocket++; else thisrocket=0; rocket_phase[thisrocket] = 0; init_rocket(thisrocket); break; } } /* Turn on backlight timeout (revert to settings) */ backlight_use_settings(); /* backlight control in lib/helper.c */ #ifdef HAVE_ADJUSTABLE_CPU_FREQ rb->cpu_boost(false); #endif return PLUGIN_OK; } f='#n440'>440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 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/***************************************************************************
*             __________               __   ___.
*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
*                     \/            \/     \/    \/            \/
* $Id$
*
* JPEG image viewer
* (This is a real mess if it has to be coded in one single C file)
*
* File scrolling addition (C) 2005 Alexander Spyridakis
* Copyright (C) 2004 J�g Hohensohn aka [IDC]Dragon
* Grayscale framework (C) 2004 Jens Arnold
* Heavily borrowed from the IJG implementation (C) Thomas G. Lane
* Small & fast downscaling IDCT (C) 2002 by Guido Vollbeding  JPEGclub.org
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/

#include "plugin.h"
#include "playback_control.h"
#include "oldmenuapi.h"
#include "helper.h"

#ifdef HAVE_LCD_BITMAP
#include "gray.h"
#include "xlcd.h"

#ifdef HAVE_LCD_COLOR
#include "lib/configfile.h"
#endif

PLUGIN_HEADER

/* variable button definitions */
#if CONFIG_KEYPAD == RECORDER_PAD
#define JPEG_ZOOM_IN BUTTON_PLAY
#define JPEG_ZOOM_OUT BUTTON_ON
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_NEXT BUTTON_F3
#define JPEG_PREVIOUS BUTTON_F2
#define JPEG_MENU BUTTON_OFF

#elif CONFIG_KEYPAD == ARCHOS_AV300_PAD
#define JPEG_ZOOM_IN BUTTON_SELECT
#define JPEG_ZOOM_OUT BUTTON_ON
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_NEXT BUTTON_F3
#define JPEG_PREVIOUS BUTTON_F2
#define JPEG_MENU BUTTON_OFF

#elif CONFIG_KEYPAD == ONDIO_PAD
#define JPEG_ZOOM_PRE BUTTON_MENU
#define JPEG_ZOOM_IN (BUTTON_MENU | BUTTON_REL)
#define JPEG_ZOOM_OUT (BUTTON_MENU | BUTTON_DOWN)
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_NEXT (BUTTON_MENU | BUTTON_RIGHT)
#define JPEG_PREVIOUS (BUTTON_MENU | BUTTON_LEFT)
#define JPEG_MENU BUTTON_OFF

#elif (CONFIG_KEYPAD == IRIVER_H100_PAD) || \
      (CONFIG_KEYPAD == IRIVER_H300_PAD)
#define JPEG_ZOOM_IN BUTTON_SELECT
#define JPEG_ZOOM_OUT BUTTON_MODE
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#if (CONFIG_KEYPAD == IRIVER_H100_PAD)
#define JPEG_NEXT BUTTON_ON
#define JPEG_PREVIOUS BUTTON_REC
#else
#define JPEG_NEXT BUTTON_REC
#define JPEG_PREVIOUS BUTTON_ON
#endif
#define JPEG_MENU BUTTON_OFF
#define JPEG_RC_MENU BUTTON_RC_STOP

#elif (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
      (CONFIG_KEYPAD == IPOD_1G2G_PAD)
#define JPEG_ZOOM_IN BUTTON_SCROLL_FWD
#define JPEG_ZOOM_OUT BUTTON_SCROLL_BACK
#define JPEG_UP BUTTON_MENU
#define JPEG_DOWN BUTTON_PLAY
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_MENU (BUTTON_SELECT | BUTTON_MENU)
#define JPEG_NEXT (BUTTON_SELECT | BUTTON_RIGHT)
#define JPEG_PREVIOUS (BUTTON_SELECT | BUTTON_LEFT)

#elif CONFIG_KEYPAD == IAUDIO_X5M5_PAD
#define JPEG_ZOOM_PRE BUTTON_SELECT
#define JPEG_ZOOM_IN (BUTTON_SELECT | BUTTON_REL)
#define JPEG_ZOOM_OUT (BUTTON_SELECT | BUTTON_REPEAT)
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_MENU BUTTON_POWER
#define JPEG_NEXT BUTTON_PLAY
#define JPEG_PREVIOUS BUTTON_REC

#elif CONFIG_KEYPAD == GIGABEAT_PAD
#define JPEG_ZOOM_IN BUTTON_VOL_UP
#define JPEG_ZOOM_OUT BUTTON_VOL_DOWN
#define JPEG_UP BUTTON_UP
#define JPEG_DOWN BUTTON_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_MENU BUTTON_MENU
#define JPEG_NEXT (BUTTON_A | BUTTON_RIGHT)
#define JPEG_PREVIOUS (BUTTON_A | BUTTON_LEFT)

#elif CONFIG_KEYPAD == SANSA_E200_PAD
#define JPEG_ZOOM_PRE           BUTTON_SELECT
#define JPEG_ZOOM_IN            (BUTTON_SELECT | BUTTON_REL)
#define JPEG_ZOOM_OUT           (BUTTON_SELECT | BUTTON_REPEAT)
#define JPEG_UP                 BUTTON_UP
#define JPEG_DOWN               BUTTON_DOWN
#define JPEG_LEFT               BUTTON_LEFT
#define JPEG_RIGHT              BUTTON_RIGHT
#define JPEG_MENU               BUTTON_POWER
#define JPEG_SLIDE_SHOW         BUTTON_REC
#define JPEG_NEXT               BUTTON_SCROLL_DOWN
#define JPEG_NEXT_REPEAT        (BUTTON_SCROLL_DOWN|BUTTON_REPEAT)
#define JPEG_PREVIOUS           BUTTON_SCROLL_UP
#define JPEG_PREVIOUS_REPEAT    (BUTTON_SCROLL_UP|BUTTON_REPEAT)

#elif CONFIG_KEYPAD == SANSA_C200_PAD
#define JPEG_ZOOM_PRE           BUTTON_SELECT
#define JPEG_ZOOM_IN            (BUTTON_SELECT | BUTTON_REL)
#define JPEG_ZOOM_OUT           (BUTTON_SELECT | BUTTON_REPEAT)
#define JPEG_UP                 BUTTON_UP
#define JPEG_DOWN               BUTTON_DOWN
#define JPEG_LEFT               BUTTON_LEFT
#define JPEG_RIGHT              BUTTON_RIGHT
#define JPEG_MENU               BUTTON_POWER
#define JPEG_SLIDE_SHOW         BUTTON_REC
#define JPEG_NEXT               BUTTON_VOL_UP
#define JPEG_NEXT_REPEAT        (BUTTON_VOL_UP|BUTTON_REPEAT)
#define JPEG_PREVIOUS           BUTTON_VOL_DOWN
#define JPEG_PREVIOUS_REPEAT    (BUTTON_VOL_DOWN|BUTTON_REPEAT)

#elif CONFIG_KEYPAD == IRIVER_H10_PAD
#define JPEG_ZOOM_PRE BUTTON_PLAY
#define JPEG_ZOOM_IN (BUTTON_PLAY | BUTTON_REL)
#define JPEG_ZOOM_OUT (BUTTON_PLAY | BUTTON_REPEAT)
#define JPEG_UP BUTTON_SCROLL_UP
#define JPEG_DOWN BUTTON_SCROLL_DOWN
#define JPEG_LEFT BUTTON_LEFT
#define JPEG_RIGHT BUTTON_RIGHT
#define JPEG_MENU BUTTON_POWER
#define JPEG_NEXT BUTTON_FF
#define JPEG_PREVIOUS BUTTON_REW

#endif

/* different graphics libraries */
#if LCD_DEPTH < 8
#define USEGSLIB
#define MYLCD(fn) gray_ub_ ## fn
#define MYLCD_UPDATE()
#define MYXLCD(fn) gray_ub_ ## fn
#else
#define MYLCD(fn) rb->lcd_ ## fn
#define MYLCD_UPDATE() rb->lcd_update();
#define MYXLCD(fn) xlcd_ ## fn
#endif

#define MAX_X_SIZE LCD_WIDTH*8

/* Min memory allowing us to use the plugin buffer
 * and thus not stopping the music
 * *Very* rough estimation:
 * Max 10 000 dir entries * 4bytes/entry (char **) = 40000 bytes
 * + 20k code size = 60 000
 * + 50k min for jpeg = 120 000
 */
#define MIN_MEM 120000

/* Headings */
#define DIR_PREV  1
#define DIR_NEXT -1
#define DIR_NONE  0

#define PLUGIN_OTHER 10 /* State code for output with return. */

/******************************* Globals ***********************************/

static struct plugin_api* rb;
MEM_FUNCTION_WRAPPERS(rb);

/* for portability of below JPEG code */
#define MEMSET(p,v,c) rb->memset(p,v,c)
#define MEMCPY(d,s,c) rb->memcpy(d,s,c)
#define INLINE static inline
#define ENDIAN_SWAP16(n) n /* only for poor little endian machines */

static int slideshow_enabled = false;   /* run slideshow */
static int running_slideshow = false;   /* loading image because of slideshw */
#ifndef SIMULATOR
static int immediate_ata_off = false;   /* power down disk after loading */
#endif
static int button_timeout    = HZ*5;

#ifdef HAVE_LCD_COLOR

/* Persistent configuration  - only needed for color displays atm */
#define JPEG_CONFIGFILE             "jpeg.cfg"
#define JPEG_SETTINGS_MINVERSION    1
#define JPEG_SETTINGS_VERSION       1

enum color_modes
{
    COLOURMODE_COLOUR = 0,
    COLOURMODE_GRAY,
    COLOUR_NUM_MODES
};

enum dither_modes
{
    DITHER_NONE = 0,    /* No dithering */
    DITHER_ORDERED,     /* Bayer ordered */
    DITHER_DIFFUSION,   /* Floyd/Steinberg error diffusion */
    DITHER_NUM_MODES
};

struct jpeg_settings
{
    int colour_mode;
    int dither_mode;
};

static struct jpeg_settings jpeg_settings =
    { COLOURMODE_COLOUR, DITHER_NONE };
static struct jpeg_settings old_settings;

static struct configdata jpeg_config[] =
{
   { TYPE_ENUM, 0, COLOUR_NUM_MODES, &jpeg_settings.colour_mode,
     "Colour Mode", (char *[]){ "Colour", "Grayscale" }, NULL },
   { TYPE_ENUM, 0, DITHER_NUM_MODES, &jpeg_settings.dither_mode,
     "Dither Mode", (char *[]){ "None", "Ordered", "Diffusion" }, NULL },
};

#endif /* HAVE_LCD_COLOR */
#if LCD_DEPTH > 1
fb_data* old_backdrop;
#endif

/**************** begin JPEG code ********************/

INLINE unsigned range_limit(int value)
{
#if CONFIG_CPU == SH7034
    unsigned tmp;
    asm (  /* Note: Uses knowledge that only low byte of result is used */
        "mov     #-128,%[t]  \n"
        "sub     %[t],%[v]   \n"  /* value -= -128; equals value += 128; */
        "extu.b  %[v],%[t]   \n"
        "cmp/eq  %[v],%[t]   \n"  /* low byte == whole number ? */
        "bt      1f          \n"  /* yes: no overflow */
        "cmp/pz  %[v]        \n"  /* overflow: positive? */
        "subc    %[v],%[v]   \n"  /* %[r] now either 0 or 0xffffffff */
    "1:                      \n"
        : /* outputs */
        [v]"+r"(value),
        [t]"=&r"(tmp)
    );
    return value;
#elif defined(CPU_COLDFIRE)
    asm (  /* Note: Uses knowledge that only the low byte of the result is used */
        "add.l   #128,%[v]   \n"  /* value += 128; */
        "cmp.l   #255,%[v]   \n"  /* overflow? */
        "bls.b   1f          \n"  /* no: return value */
        "spl.b   %[v]        \n"  /* yes: set low byte to appropriate boundary */
    "1:                      \n"
        : /* outputs */
        [v]"+d"(value)
    );
    return value;
#elif defined(CPU_ARM)
    asm (  /* Note: Uses knowledge that only the low byte of the result is used */
        "add     %[v], %[v], #128    \n"  /* value += 128 */
        "cmp     %[v], #255          \n"  /* out of range 0..255? */
        "mvnhi   %[v], %[v], asr #31 \n"  /* yes: set all bits to ~(sign_bit) */
        : /* outputs */
        [v]"+r"(value)
    );
    return value;
#else
    value += 128;

    if ((unsigned)value <= 255)
        return value;

    if (value < 0)
        return 0;

    return 255;
#endif
}

/* IDCT implementation */


#define CONST_BITS 13
#define PASS1_BITS 2


/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
* causing a lot of useless floating-point operations at run time.
* To get around this we use the following pre-calculated constants.
* If you change CONST_BITS you may want to add appropriate values.
* (With a reasonable C compiler, you can just rely on the FIX() macro...)
*/
#define FIX_0_298631336  2446 /* FIX(0.298631336) */
#define FIX_0_390180644  3196 /* FIX(0.390180644) */
#define FIX_0_541196100  4433 /* FIX(0.541196100) */
#define FIX_0_765366865  6270 /* FIX(0.765366865) */
#define FIX_0_899976223  7373 /* FIX(0.899976223) */
#define FIX_1_175875602  9633 /* FIX(1.175875602) */
#define FIX_1_501321110 12299 /* FIX(1.501321110) */
#define FIX_1_847759065 15137 /* FIX(1.847759065) */
#define FIX_1_961570560 16069 /* FIX(1.961570560) */
#define FIX_2_053119869 16819 /* FIX(2.053119869) */
#define FIX_2_562915447 20995 /* FIX(2.562915447) */
#define FIX_3_072711026 25172 /* FIX(3.072711026) */



/* Multiply an long variable by an long constant to yield an long result.
* For 8-bit samples with the recommended scaling, all the variable
* and constant values involved are no more than 16 bits wide, so a
* 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
* For 12-bit samples, a full 32-bit multiplication will be needed.
*/
#define MULTIPLY16(var,const)  (((short) (var)) * ((short) (const)))


/* Dequantize a coefficient by multiplying it by the multiplier-table
* entry; produce an int result.  In this module, both inputs and result
* are 16 bits or less, so either int or short multiply will work.
*/
/* #define DEQUANTIZE(coef,quantval)  (((int) (coef)) * (quantval)) */
#define DEQUANTIZE MULTIPLY16

/* Descale and correctly round an int value that's scaled by N bits.
* We assume RIGHT_SHIFT rounds towards minus infinity, so adding
* the fudge factor is correct for either sign of X.
*/
#define DESCALE(x,n) (((x) + (1l << ((n)-1))) >> (n))



/*
* Perform dequantization and inverse DCT on one block of coefficients,
* producing a reduced-size 1x1 output block.
*/
void idct1x1(unsigned char* p_byte, int* inptr, int* quantptr, int skip_line)
{
    (void)skip_line; /* unused */
    *p_byte = range_limit(inptr[0] * quantptr[0] >> 3);
}



/*
* Perform dequantization and inverse DCT on one block of coefficients,
* producing a reduced-size 2x2 output block.
*/
void idct2x2(unsigned char* p_byte, int* inptr, int* quantptr, int skip_line)
{
    int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
    unsigned char* outptr;

    /* Pass 1: process columns from input, store into work array. */

    /* Column 0 */
    tmp4 = DEQUANTIZE(inptr[8*0], quantptr[8*0]);
    tmp5 = DEQUANTIZE(inptr[8*1], quantptr[8*1]);

    tmp0 = tmp4 + tmp5;
    tmp2 = tmp4 - tmp5;

    /* Column 1 */
    tmp4 = DEQUANTIZE(inptr[8*0+1], quantptr[8*0+1]);
    tmp5 = DEQUANTIZE(inptr[8*1+1], quantptr[8*1+1]);

    tmp1 = tmp4 + tmp5;
    tmp3 = tmp4 - tmp5;

    /* Pass 2: process 2 rows, store into output array. */

    /* Row 0 */
    outptr = p_byte;

    outptr[0] = range_limit((int) DESCALE(tmp0 + tmp1, 3));
    outptr[1] = range_limit((int) DESCALE(tmp0 - tmp1, 3));

    /* Row 1 */
    outptr = p_byte + skip_line;

    outptr[0] = range_limit((int) DESCALE(tmp2 + tmp3, 3));
    outptr[1] = range_limit((int) DESCALE(tmp2 - tmp3, 3));
}



/*
* Perform dequantization and inverse DCT on one block of coefficients,
* producing a reduced-size 4x4 output block.
*/
void idct4x4(unsigned char* p_byte, int* inptr, int* quantptr, int skip_line)
{
    int tmp0, tmp2, tmp10, tmp12;
    int z1, z2, z3;
    int * wsptr;
    unsigned char* outptr;
    int ctr;
    int workspace[4*4]; /* buffers data between passes */

    /* Pass 1: process columns from input, store into work array. */

    wsptr = workspace;
    for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++)
    {
        /* Even part */

        tmp0 = DEQUANTIZE(inptr[8*0], quantptr[8*0]);
        tmp2 = DEQUANTIZE(inptr[8*2], quantptr[8*2]);

        tmp10 = (tmp0 + tmp2) << PASS1_BITS;
        tmp12 = (tmp0 - tmp2) << PASS1_BITS;

        /* Odd part */
        /* Same rotation as in the even part of the 8x8 LL&M IDCT */

        z2 = DEQUANTIZE(inptr[8*1], quantptr[8*1]);
        z3 = DEQUANTIZE(inptr[8*3], quantptr[8*3]);

        z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
        tmp0 = DESCALE(z1 + MULTIPLY16(z3, - FIX_1_847759065), CONST_BITS-PASS1_BITS);
        tmp2 = DESCALE(z1 + MULTIPLY16(z2, FIX_0_765366865), CONST_BITS-PASS1_BITS);

        /* Final output stage */

        wsptr[4*0] = (int) (tmp10 + tmp2);
        wsptr[4*3] = (int) (tmp10 - tmp2);
        wsptr[4*1] = (int) (tmp12 + tmp0);
        wsptr[4*2] = (int) (tmp12 - tmp0);
    }

    /* Pass 2: process 4 rows from work array, store into output array. */

    wsptr = workspace;
    for (ctr = 0; ctr < 4; ctr++)
    {
        outptr = p_byte + (ctr*skip_line);
        /* Even part */

        tmp0 = (int) wsptr[0];
        tmp2 = (int) wsptr[2];

        tmp10 = (tmp0 + tmp2) << CONST_BITS;
        tmp12 = (tmp0 - tmp2) << CONST_BITS;

        /* Odd part */
        /* Same rotation as in the even part of the 8x8 LL&M IDCT */

        z2 = (int) wsptr[1];
        z3 = (int) wsptr[3];

        z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
        tmp0 = z1 + MULTIPLY16(z3, - FIX_1_847759065);
        tmp2 = z1 + MULTIPLY16(z2, FIX_0_765366865);

        /* Final output stage */

        outptr[0] = range_limit((int) DESCALE(tmp10 + tmp2,
            CONST_BITS+PASS1_BITS+3));
        outptr[3] = range_limit((int) DESCALE(tmp10 - tmp2,
            CONST_BITS+PASS1_BITS+3));
        outptr[1] = range_limit((int) DESCALE(tmp12 + tmp0,
            CONST_BITS+PASS1_BITS+3));
        outptr[2] = range_limit((int) DESCALE(tmp12 - tmp0,
            CONST_BITS+PASS1_BITS+3));

        wsptr += 4;     /* advance pointer to next row */
    }
}



/*
* Perform dequantization and inverse DCT on one block of coefficients.
*/
void idct8x8(unsigned char* p_byte, int* inptr, int* quantptr, int skip_line)
{
    long tmp0, tmp1, tmp2, tmp3;
    long tmp10, tmp11, tmp12, tmp13;
    long z1, z2, z3, z4, z5;
    int * wsptr;
    unsigned char* outptr;
    int ctr;
    int workspace[64];  /* buffers data between passes */

    /* Pass 1: process columns from input, store into work array. */
    /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
    /* furthermore, we scale the results by 2**PASS1_BITS. */

    wsptr = workspace;
    for (ctr = 8; ctr > 0; ctr--)
    {
    /* Due to quantization, we will usually find that many of the input
    * coefficients are zero, especially the AC terms.  We can exploit this
    * by short-circuiting the IDCT calculation for any column in which all
    * the AC terms are zero.  In that case each output is equal to the
    * DC coefficient (with scale factor as needed).
    * With typical images and quantization tables, half or more of the
    * column DCT calculations can be simplified this way.
    */

        if ((inptr[8*1] | inptr[8*2] | inptr[8*3]
           | inptr[8*4] | inptr[8*5] | inptr[8*6] | inptr[8*7]) == 0)
        {
            /* AC terms all zero */
            int dcval = DEQUANTIZE(inptr[8*0], quantptr[8*0]) << PASS1_BITS;

            wsptr[8*0] = wsptr[8*1] = wsptr[8*2] = wsptr[8*3] = wsptr[8*4]
                       = wsptr[8*5] = wsptr[8*6] = wsptr[8*7] = dcval;
            inptr++;      /* advance pointers to next column */
            quantptr++;
            wsptr++;
            continue;
        }

        /* Even part: reverse the even part of the forward DCT. */
        /* The rotator is sqrt(2)*c(-6). */

        z2 = DEQUANTIZE(inptr[8*2], quantptr[8*2]);
        z3 = DEQUANTIZE(inptr[8*6], quantptr[8*6]);

        z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
        tmp2 = z1 + MULTIPLY16(z3, - FIX_1_847759065);
        tmp3 = z1 + MULTIPLY16(z2, FIX_0_765366865);

        z2 = DEQUANTIZE(inptr[8*0], quantptr[8*0]);
        z3 = DEQUANTIZE(inptr[8*4], quantptr[8*4]);

        tmp0 = (z2 + z3) << CONST_BITS;
        tmp1 = (z2 - z3) << CONST_BITS;

        tmp10 = tmp0 + tmp3;
        tmp13 = tmp0 - tmp3;
        tmp11 = tmp1 + tmp2;
        tmp12 = tmp1 - tmp2;

        /* Odd part per figure 8; the matrix is unitary and hence its
           transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively. */

        tmp0 = DEQUANTIZE(inptr[8*7], quantptr[8*7]);
        tmp1 = DEQUANTIZE(inptr[8*5], quantptr[8*5]);
        tmp2 = DEQUANTIZE(inptr[8*3], quantptr[8*3]);
        tmp3 = DEQUANTIZE(inptr[8*1], quantptr[8*1]);

        z1 = tmp0 + tmp3;
        z2 = tmp1 + tmp2;
        z3 = tmp0 + tmp2;
        z4 = tmp1 + tmp3;
        z5 = MULTIPLY16(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */

        tmp0 = MULTIPLY16(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
        tmp1 = MULTIPLY16(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
        tmp2 = MULTIPLY16(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
        tmp3 = MULTIPLY16(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
        z1 = MULTIPLY16(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
        z2 = MULTIPLY16(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
        z3 = MULTIPLY16(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
        z4 = MULTIPLY16(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */

        z3 += z5;
        z4 += z5;

        tmp0 += z1 + z3;
        tmp1 += z2 + z4;
        tmp2 += z2 + z3;
        tmp3 += z1 + z4;

        /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

        wsptr[8*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
        wsptr[8*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
        wsptr[8*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
        wsptr[8*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
        wsptr[8*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
        wsptr[8*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
        wsptr[8*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
        wsptr[8*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS);

        inptr++; /* advance pointers to next column */
        quantptr++;
        wsptr++;
    }

    /* Pass 2: process rows from work array, store into output array. */
    /* Note that we must descale the results by a factor of 8 == 2**3, */
    /* and also undo the PASS1_BITS scaling. */

    wsptr = workspace;
    for (ctr = 0; ctr < 8; ctr++)
    {
        outptr = p_byte + (ctr*skip_line);
        /* Rows of zeroes can be exploited in the same way as we did with columns.
        * However, the column calculation has created many nonzero AC terms, so
        * the simplification applies less often (typically 5% to 10% of the time).
        * On machines with very fast multiplication, it's possible that the
        * test takes more time than it's worth.  In that case this section
        * may be commented out.
        */

#ifndef NO_ZERO_ROW_TEST
        if ((wsptr[1] | wsptr[2] | wsptr[3]
           | wsptr[4] | wsptr[5] | wsptr[6] | wsptr[7]) == 0)
        {
            /* AC terms all zero */
            unsigned char dcval = range_limit((int) DESCALE((long) wsptr[0],
                PASS1_BITS+3));

            outptr[0] = dcval;
            outptr[1] = dcval;
            outptr[2] = dcval;
            outptr[3] = dcval;
            outptr[4] = dcval;
            outptr[5] = dcval;
            outptr[6] = dcval;
            outptr[7] = dcval;

            wsptr += 8; /* advance pointer to next row */
            continue;
        }
#endif

        /* Even part: reverse the even part of the forward DCT. */
        /* The rotator is sqrt(2)*c(-6). */

        z2 = (long) wsptr[2];
        z3 = (long) wsptr[6];

        z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
        tmp2 = z1 + MULTIPLY16(z3, - FIX_1_847759065);
        tmp3 = z1 + MULTIPLY16(z2, FIX_0_765366865);

        tmp0 = ((long) wsptr[0] + (long) wsptr[4]) << CONST_BITS;
        tmp1 = ((long) wsptr[0] - (long) wsptr[4]) << CONST_BITS;

        tmp10 = tmp0 + tmp3;
        tmp13 = tmp0 - tmp3;
        tmp11 = tmp1 + tmp2;
        tmp12 = tmp1 - tmp2;

        /* Odd part per figure 8; the matrix is unitary and hence its
        * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */

        tmp0 = (long) wsptr[7];
        tmp1 = (long) wsptr[5];
        tmp2 = (long) wsptr[3];
        tmp3 = (long) wsptr[1];

        z1 = tmp0 + tmp3;
        z2 = tmp1 + tmp2;
        z3 = tmp0 + tmp2;
        z4 = tmp1 + tmp3;
        z5 = MULTIPLY16(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */

        tmp0 = MULTIPLY16(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
        tmp1 = MULTIPLY16(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
        tmp2 = MULTIPLY16(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
        tmp3 = MULTIPLY16(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
        z1 = MULTIPLY16(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
        z2 = MULTIPLY16(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
        z3 = MULTIPLY16(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
        z4 = MULTIPLY16(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */

        z3 += z5;
        z4 += z5;

        tmp0 += z1 + z3;
        tmp1 += z2 + z4;
        tmp2 += z2 + z3;
        tmp3 += z1 + z4;

        /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

        outptr[0] = range_limit((int) DESCALE(tmp10 + tmp3,
            CONST_BITS+PASS1_BITS+3));
        outptr[7] = range_limit((int) DESCALE(tmp10 - tmp3,
            CONST_BITS+PASS1_BITS+3));
        outptr[1] = range_limit((int) DESCALE(tmp11 + tmp2,
            CONST_BITS+PASS1_BITS+3));
        outptr[6] = range_limit((int) DESCALE(tmp11 - tmp2,
            CONST_BITS+PASS1_BITS+3));
        outptr[2] = range_limit((int) DESCALE(tmp12 + tmp1,
            CONST_BITS+PASS1_BITS+3));
        outptr[5] = range_limit((int) DESCALE(tmp12 - tmp1,
            CONST_BITS+PASS1_BITS+3));
        outptr[3] = range_limit((int) DESCALE(tmp13 + tmp0,
            CONST_BITS+PASS1_BITS+3));
        outptr[4] = range_limit((int) DESCALE(tmp13 - tmp0,
            CONST_BITS+PASS1_BITS+3));

        wsptr += 8; /* advance pointer to next row */
    }
}



/* JPEG decoder implementation */


#define HUFF_LOOKAHEAD 8 /* # of bits of lookahead */

struct derived_tbl
{
    /* Basic tables: (element [0] of each array is unused) */
    long mincode[17]; /* smallest code of length k */
    long maxcode[18]; /* largest code of length k (-1 if none) */
    /* (maxcode[17] is a sentinel to ensure huff_DECODE terminates) */
    int valptr[17]; /* huffval[] index of 1st symbol of length k */

    /* Back link to public Huffman table (needed only in slow_DECODE) */
    int* pub;

    /* Lookahead tables: indexed by the next HUFF_LOOKAHEAD bits of
    the input data stream.  If the next Huffman code is no more
    than HUFF_LOOKAHEAD bits long, we can obtain its length and
    the corresponding symbol directly from these tables. */
    int look_nbits[1<<HUFF_LOOKAHEAD]; /* # bits, or 0 if too long */
    unsigned char look_sym[1<<HUFF_LOOKAHEAD]; /* symbol, or unused */
};

#define QUANT_TABLE_LENGTH  64

/* for type of Huffman table */
#define DC_LEN 28
#define AC_LEN 178

struct huffman_table
{   /* length and code according to JFIF format */
    int huffmancodes_dc[DC_LEN];
    int huffmancodes_ac[AC_LEN];
};

struct frame_component
{
    int ID;
    int horizontal_sampling;
    int vertical_sampling;
    int quanttable_select;
};

struct scan_component
{
    int ID;
    int DC_select;
    int AC_select;
};

struct bitstream
{
    unsigned long get_buffer; /* current bit-extraction buffer */
    int bits_left; /* # of unused bits in it */
    unsigned char* next_input_byte;
    unsigned char* input_end; /* upper limit +1 */
};

struct jpeg
{
    int x_size, y_size; /* size of image (can be less than block boundary) */
    int x_phys, y_phys; /* physical size, block aligned */
    int x_mbl; /* x dimension of MBL */
    int y_mbl; /* y dimension of MBL */
    int blocks; /* blocks per MB */
    int restart_interval; /* number of MCUs between RSTm markers */
    int store_pos[4]; /* for Y block ordering */

    unsigned char* p_entropy_data;
    unsigned char* p_entropy_end;

    int quanttable[4][QUANT_TABLE_LENGTH]; /* raw quantization tables 0-3 */
    int qt_idct[2][QUANT_TABLE_LENGTH]; /* quantization tables for IDCT */

    struct huffman_table hufftable[2]; /* Huffman tables  */
    struct derived_tbl dc_derived_tbls[2]; /* Huffman-LUTs */
    struct derived_tbl ac_derived_tbls[2];

    struct frame_component frameheader[3]; /* Component descriptor */
    struct scan_component scanheader[3]; /* currently not used */

    int mcu_membership[6]; /* info per block */
    int tab_membership[6];
    int subsample_x[3]; /* info per component */
    int subsample_y[3];
};


/* possible return flags for process_markers() */
#define HUFFTAB   0x0001 /* with huffman table */
#define QUANTTAB  0x0002 /* with quantization table */
#define APP0_JFIF 0x0004 /* with APP0 segment following JFIF standard */
#define FILL_FF   0x0008 /* with 0xFF padding bytes at begin/end */
#define SOF0      0x0010 /* with SOF0-Segment */
#define DHT       0x0020 /* with Definition of huffman tables */
#define SOS       0x0040 /* with Start-of-Scan segment */
#define DQT       0x0080 /* with definition of quantization table */

/* Preprocess the JPEG JFIF file */
int process_markers(unsigned char* p_src, long size, struct jpeg* p_jpeg)
{
    unsigned char* p_bytes = p_src;
    int marker_size; /* variable length of marker segment */
    int i, j, n;
    int ret = 0; /* returned flags */

    p_jpeg->p_entropy_end = p_src + size;

    while (p_src < p_bytes + size)
    {
        if (*p_src++ != 0xFF) /* no marker? */
        {
            p_src--; /* it's image data, put it back */
            p_jpeg->p_entropy_data = p_src;
            break; /* exit marker processing */
        }

        switch (*p_src++)
        {
        case 0xFF: /* Fill byte */
            ret |= FILL_FF;
        case 0x00: /* Zero stuffed byte - entropy data */
            p_src--; /* put it back */
            continue;

        case 0xC0: /* SOF Huff  - Baseline DCT */
            {
                ret |= SOF0;
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */
                n = *p_src++; /* sample precision (= 8 or 12) */
                if (n != 8)
                {
                    return(-1); /* Unsupported sample precision */
                }
                p_jpeg->y_size = *p_src++ << 8; /* Highbyte */
                p_jpeg->y_size |= *p_src++; /* Lowbyte */
                p_jpeg->x_size = *p_src++ << 8; /* Highbyte */
                p_jpeg->x_size |= *p_src++; /* Lowbyte */

                n = (marker_size-2-6)/3;
                if (*p_src++ != n || (n != 1 && n != 3))
                {
                    return(-2); /* Unsupported SOF0 component specification */
                }
                for (i=0; i<n; i++)
                {
                    p_jpeg->frameheader[i].ID = *p_src++; /* Component info */
                    p_jpeg->frameheader[i].horizontal_sampling = *p_src >> 4;
                    p_jpeg->frameheader[i].vertical_sampling = *p_src++ & 0x0F;
                    p_jpeg->frameheader[i].quanttable_select = *p_src++;
                    if (p_jpeg->frameheader[i].horizontal_sampling > 2
                     || p_jpeg->frameheader[i].vertical_sampling > 2)
                    return -3; /* Unsupported SOF0 subsampling */
                }
                p_jpeg->blocks = n;
            }
            break;

        case 0xC1: /* SOF Huff  - Extended sequential DCT*/
        case 0xC2: /* SOF Huff  - Progressive DCT*/
        case 0xC3: /* SOF Huff  - Spatial (sequential) lossless*/
        case 0xC5: /* SOF Huff  - Differential sequential DCT*/
        case 0xC6: /* SOF Huff  - Differential progressive DCT*/
        case 0xC7: /* SOF Huff  - Differential spatial*/
        case 0xC8: /* SOF Arith - Reserved for JPEG extensions*/
        case 0xC9: /* SOF Arith - Extended sequential DCT*/
        case 0xCA: /* SOF Arith - Progressive DCT*/
        case 0xCB: /* SOF Arith - Spatial (sequential) lossless*/
        case 0xCD: /* SOF Arith - Differential sequential DCT*/
        case 0xCE: /* SOF Arith - Differential progressive DCT*/
        case 0xCF: /* SOF Arith - Differential spatial*/
            {
                return (-4); /* other DCT model than baseline not implemented */
            }

        case 0xC4: /* Define Huffman Table(s) */
            {
                unsigned char* p_temp;

                ret |= DHT;
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */

                p_temp = p_src;
                while (p_src < p_temp+marker_size-2-17) /* another table */
                {
                    int sum = 0;
                    i = *p_src & 0x0F; /* table index */
                    if (i > 1)
                    {
                        return (-5); /* Huffman table index out of range */
                    }
                    else if (*p_src++ & 0xF0) /* AC table */
                    {
                        for (j=0; j<16; j++)
                        {
                            sum += *p_src;
                            p_jpeg->hufftable[i].huffmancodes_ac[j] = *p_src++;
                        }
                        if(16 + sum > AC_LEN)
                            return -10; /* longer than allowed */

                        for (; j < 16 + sum; j++)
                            p_jpeg->hufftable[i].huffmancodes_ac[j] = *p_src++;
                    }
                    else /* DC table */
                    {
                        for (j=0; j<16; j++)
                        {
                            sum += *p_src;
                            p_jpeg->hufftable[i].huffmancodes_dc[j] = *p_src++;
                        }
                        if(16 + sum > DC_LEN)
                            return -11; /* longer than allowed */

                        for (; j < 16 + sum; j++)
                            p_jpeg->hufftable[i].huffmancodes_dc[j] = *p_src++;
                    }
                } /* while */
                p_src = p_temp+marker_size - 2; /* skip possible residue */
            }
            break;

        case 0xCC: /* Define Arithmetic coding conditioning(s) */
            return(-6); /* Arithmetic coding not supported */

        case 0xD8: /* Start of Image */
        case 0xD9: /* End of Image */
        case 0x01: /* for temp private use arith code */
            break; /* skip parameterless marker */


        case 0xDA: /* Start of Scan */
            {
                ret |= SOS;
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */

                n = (marker_size-2-1-3)/2;
                if (*p_src++ != n || (n != 1 && n != 3))
                {
                    return (-7); /* Unsupported SOS component specification */
                }
                for (i=0; i<n; i++)
                {
                    p_jpeg->scanheader[i].ID = *p_src++;
                    p_jpeg->scanheader[i].DC_select = *p_src >> 4;
                    p_jpeg->scanheader[i].AC_select = *p_src++ & 0x0F;
                }
                p_src += 3; /* skip spectral information */
            }
            break;

        case 0xDB: /* Define quantization Table(s) */
            {
                ret |= DQT;
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */
                n = (marker_size-2)/(QUANT_TABLE_LENGTH+1); /* # of tables */
                for (i=0; i<n; i++)
                {
                    int id = *p_src++; /* ID */
                    if (id >= 4)
                    {
                        return (-8); /* Unsupported quantization table */
                    }
                    /* Read Quantisation table: */
                    for (j=0; j<QUANT_TABLE_LENGTH; j++)
                        p_jpeg->quanttable[id][j] = *p_src++;
                }
            }
            break;

        case 0xDD: /* Define Restart Interval */
            {
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */
                p_jpeg->restart_interval = *p_src++ << 8; /* Highbyte */
                p_jpeg->restart_interval |= *p_src++; /* Lowbyte */
                p_src += marker_size-4; /* skip segment */
            }
            break;

        case 0xDC: /* Define Number of Lines */
        case 0xDE: /* Define Hierarchical progression */
        case 0xDF: /* Expand Reference Component(s) */
        case 0xE0: /* Application Field 0*/
        case 0xE1: /* Application Field 1*/
        case 0xE2: /* Application Field 2*/
        case 0xE3: /* Application Field 3*/
        case 0xE4: /* Application Field 4*/
        case 0xE5: /* Application Field 5*/
        case 0xE6: /* Application Field 6*/
        case 0xE7: /* Application Field 7*/
        case 0xE8: /* Application Field 8*/
        case 0xE9: /* Application Field 9*/
        case 0xEA: /* Application Field 10*/
        case 0xEB: /* Application Field 11*/
        case 0xEC: /* Application Field 12*/
        case 0xED: /* Application Field 13*/
        case 0xEE: /* Application Field 14*/
        case 0xEF: /* Application Field 15*/
        case 0xFE: /* Comment */
            {
                marker_size = *p_src++ << 8; /* Highbyte */
                marker_size |= *p_src++; /* Lowbyte */
                p_src += marker_size-2; /* skip segment */
            }
            break;

        case 0xF0: /* Reserved for JPEG extensions */
        case 0xF1: /* Reserved for JPEG extensions */
        case 0xF2: /* Reserved for JPEG extensions */
        case 0xF3: /* Reserved for JPEG extensions */
        case 0xF4: /* Reserved for JPEG extensions */
        case 0xF5: /* Reserved for JPEG extensions */
        case 0xF6: /* Reserved for JPEG extensions */
        case 0xF7: /* Reserved for JPEG extensions */
        case 0xF8: /* Reserved for JPEG extensions */
        case 0xF9: /* Reserved for JPEG extensions */
        case 0xFA: /* Reserved for JPEG extensions */
        case 0xFB: /* Reserved for JPEG extensions */
        case 0xFC: /* Reserved for JPEG extensions */
        case 0xFD: /* Reserved for JPEG extensions */
        case 0x02: /* Reserved */
        default:
            return (-9); /* Unknown marker */
        } /* switch */
    } /* while */

    return (ret); /* return flags with seen markers */
}


void default_huff_tbl(struct jpeg* p_jpeg)
{
    static const struct huffman_table luma_table =
    {
        {
            0x00,0x01,0x05,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B
        },
        {
            0x00,0x02,0x01,0x03,0x03,0x02,0x04,0x03,0x05,0x05,0x04,0x04,0x00,0x00,0x01,0x7D,
            0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,
            0x22,0x71,0x14,0x32,0x81,0x91,0xA1,0x08,0x23,0x42,0xB1,0xC1,0x15,0x52,0xD1,0xF0,
            0x24,0x33,0x62,0x72,0x82,0x09,0x0A,0x16,0x17,0x18,0x19,0x1A,0x25,0x26,0x27,0x28,
            0x29,0x2A,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x43,0x44,0x45,0x46,0x47,0x48,0x49,
            0x4A,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x63,0x64,0x65,0x66,0x67,0x68,0x69,
            0x6A,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
            0x8A,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,
            0xA8,0xA9,0xAA,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xC2,0xC3,0xC4,0xC5,
            0xC6,0xC7,0xC8,0xC9,0xCA,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xE1,0xE2,
            0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,
            0xF9,0xFA
        }
    };

    static const struct huffman_table chroma_table =
    {
        {
            0x00,0x03,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,
            0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B
        },
        {
            0x00,0x02,0x01,0x02,0x04,0x04,0x03,0x04,0x07,0x05,0x04,0x04,0x00,0x01,0x02,0x77,
            0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,
            0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,0xA1,0xB1,0xC1,0x09,0x23,0x33,0x52,0xF0,
            0x15,0x62,0x72,0xD1,0x0A,0x16,0x24,0x34,0xE1,0x25,0xF1,0x17,0x18,0x19,0x1A,0x26,
            0x27,0x28,0x29,0x2A,0x35,0x36,0x37,0x38,0x39,0x3A,0x43,0x44,0x45,0x46,0x47,0x48,
            0x49,0x4A,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x63,0x64,0x65,0x66,0x67,0x68,
            0x69,0x6A,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x82,0x83,0x84,0x85,0x86,0x87,
            0x88,0x89,0x8A,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0xA2,0xA3,0xA4,0xA5,
            0xA6,0xA7,0xA8,0xA9,0xAA,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xC2,0xC3,
            0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,
            0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,
            0xF9,0xFA
        }
    };

    MEMCPY(&p_jpeg->hufftable[0], &luma_table, sizeof(luma_table));
    MEMCPY(&p_jpeg->hufftable[1], &chroma_table, sizeof(chroma_table));

    return;
}

/* Compute the derived values for a Huffman table */
void fix_huff_tbl(int* htbl, struct derived_tbl* dtbl)
{
    int p, i, l, si;
    int lookbits, ctr;
    char huffsize[257];
    unsigned int huffcode[257];
    unsigned int code;

    dtbl->pub = htbl; /* fill in back link */

    /* Figure C.1: make table of Huffman code length for each symbol */
    /* Note that this is in code-length order. */

    p = 0;
    for (l = 1; l <= 16; l++)
    {    /* all possible code length */
        for (i = 1; i <= (int) htbl[l-1]; i++)  /* all codes per length */
            huffsize[p++] = (char) l;
    }
    huffsize[p] = 0;

    /* Figure C.2: generate the codes themselves */
    /* Note that this is in code-length order. */

    code = 0;
    si = huffsize[0];
    p = 0;
    while (huffsize[p])
    {
        while (((int) huffsize[p]) == si)
        {
            huffcode[p++] = code;
            code++;
        }
        code <<= 1;
        si++;
    }

    /* Figure F.15: generate decoding tables for bit-sequential decoding */

    p = 0;
    for (l = 1; l <= 16; l++)
    {
        if (htbl[l-1])
        {
            dtbl->valptr[l] = p; /* huffval[] index of 1st symbol of code length l */
            dtbl->mincode[l] = huffcode[p]; /* minimum code of length l */
            p += htbl[l-1];
            dtbl->maxcode[l] = huffcode[p-1]; /* maximum code of length l */
        }
        else
        {
            dtbl->maxcode[l] = -1;  /* -1 if no codes of this length */
        }
    }
    dtbl->maxcode[17] = 0xFFFFFL; /* ensures huff_DECODE terminates */

    /* Compute lookahead tables to speed up decoding.
    * First we set all the table entries to 0, indicating "too long";
    * then we iterate through the Huffman codes that are short enough and
    * fill in all the entries that correspond to bit sequences starting
    * with that code.
    */

    MEMSET(dtbl->look_nbits, 0, sizeof(dtbl->look_nbits));

    p = 0;
    for (l = 1; l <= HUFF_LOOKAHEAD; l++)
    {
        for (i = 1; i <= (int) htbl[l-1]; i++, p++)
        {
            /* l = current code's length, p = its index in huffcode[] & huffval[]. */
            /* Generate left-justified code followed by all possible bit sequences */
            lookbits = huffcode[p] << (HUFF_LOOKAHEAD-l);
            for (ctr = 1 << (HUFF_LOOKAHEAD-l); ctr > 0; ctr--)
            {
                dtbl->look_nbits[lookbits] = l;
                dtbl->look_sym[lookbits] = htbl[16+p];
                lookbits++;
            }
        }
    }
}


/* zag[i] is the natural-order position of the i'th element of zigzag order.
 * If the incoming data is corrupted, decode_mcu could attempt to
 * reference values beyond the end of the array.  To avoid a wild store,
 * we put some extra zeroes after the real entries.
 */
static const int zag[] =
{
     0,  1,  8, 16,  9,  2,  3, 10,
    17, 24, 32, 25, 18, 11,  4,  5,
    12, 19, 26, 33, 40, 48, 41, 34,
    27, 20, 13,  6,  7, 14, 21, 28,
    35, 42, 49, 56, 57, 50, 43, 36,
    29, 22, 15, 23, 30, 37, 44, 51,
    58, 59, 52, 45, 38, 31, 39, 46,
    53, 60, 61, 54, 47, 55, 62, 63,
     0,  0,  0,  0,  0,  0,  0,  0, /* extra entries in case k>63 below */
     0,  0,  0,  0,  0,  0,  0,  0
};

void build_lut(struct jpeg* p_jpeg)
{
    int i;
    fix_huff_tbl(p_jpeg->hufftable[0].huffmancodes_dc,
        &p_jpeg->dc_derived_tbls[0]);
    fix_huff_tbl(p_jpeg->hufftable[0].huffmancodes_ac,
        &p_jpeg->ac_derived_tbls[0]);
    fix_huff_tbl(p_jpeg->hufftable[1].huffmancodes_dc,
        &p_jpeg->dc_derived_tbls[1]);
    fix_huff_tbl(p_jpeg->hufftable[1].huffmancodes_ac,
        &p_jpeg->ac_derived_tbls[1]);

    /* build the dequantization tables for the IDCT (De-ZiZagged) */
    for (i=0; i<64; i++)
    {
        p_jpeg->qt_idct[0][zag[i]] = p_jpeg->quanttable[0][i];
        p_jpeg->qt_idct[1][zag[i]] = p_jpeg->quanttable[1][i];
    }

    for (i=0; i<4; i++)
        p_jpeg->store_pos[i] = i; /* default ordering */

    /* assignments for the decoding of blocks */
    if (p_jpeg->frameheader[0].horizontal_sampling == 2
        && p_jpeg->frameheader[0].vertical_sampling == 1)
    {   /* 4:2:2 */
        p_jpeg->blocks = 4;
        p_jpeg->x_mbl = (p_jpeg->x_size+15) / 16;
        p_jpeg->x_phys = p_jpeg->x_mbl * 16;
        p_jpeg->y_mbl = (p_jpeg->y_size+7) / 8;
        p_jpeg->y_phys = p_jpeg->y_mbl * 8;
        p_jpeg->mcu_membership[0] = 0; /* Y1=Y2=0, U=1, V=2 */
        p_jpeg->mcu_membership[1] = 0;
        p_jpeg->mcu_membership[2] = 1;
        p_jpeg->mcu_membership[3] = 2;
        p_jpeg->tab_membership[0] = 0; /* DC, DC, AC, AC */
        p_jpeg->tab_membership[1] = 0;
        p_jpeg->tab_membership[2] = 1;
        p_jpeg->tab_membership[3] = 1;
        p_jpeg->subsample_x[0] = 1;
        p_jpeg->subsample_x[1] = 2;
        p_jpeg->subsample_x[2] = 2;
        p_jpeg->subsample_y[0] = 1;
        p_jpeg->subsample_y[1] = 1;
        p_jpeg->subsample_y[2] = 1;
    }
    if (p_jpeg->frameheader[0].horizontal_sampling == 1
        && p_jpeg->frameheader[0].vertical_sampling == 2)
    {   /* 4:2:2 vertically subsampled */
        p_jpeg->store_pos[1] = 2; /* block positions are mirrored */
        p_jpeg->store_pos[2] = 1;
        p_jpeg->blocks = 4;
        p_jpeg->x_mbl = (p_jpeg->x_size+7) / 8;
        p_jpeg->x_phys = p_jpeg->x_mbl * 8;
        p_jpeg->y_mbl = (p_jpeg->y_size+15) / 16;
        p_jpeg->y_phys = p_jpeg->y_mbl * 16;
        p_jpeg->mcu_membership[0] = 0; /* Y1=Y2=0, U=1, V=2 */
        p_jpeg->mcu_membership[1] = 0;
        p_jpeg->mcu_membership[2] = 1;
        p_jpeg->mcu_membership[3] = 2;
        p_jpeg->tab_membership[0] = 0; /* DC, DC, AC, AC */
        p_jpeg->tab_membership[1] = 0;
        p_jpeg->tab_membership[2] = 1;
        p_jpeg->tab_membership[3] = 1;
        p_jpeg->subsample_x[0] = 1;
        p_jpeg->subsample_x[1] = 1;
        p_jpeg->subsample_x[2] = 1;
        p_jpeg->subsample_y[0] = 1;
        p_jpeg->subsample_y[1] = 2;
        p_jpeg->subsample_y[2] = 2;
    }
    else if (p_jpeg->frameheader[0].horizontal_sampling == 2
        && p_jpeg->frameheader[0].vertical_sampling == 2)
    {   /* 4:2:0 */
        p_jpeg->blocks = 6;
        p_jpeg->x_mbl = (p_jpeg->x_size+15) / 16;
        p_jpeg->x_phys = p_jpeg->x_mbl * 16;
        p_jpeg->y_mbl = (p_jpeg->y_size+15) / 16;
        p_jpeg->y_phys = p_jpeg->y_mbl * 16;
        p_jpeg->mcu_membership[0] = 0;
        p_jpeg->mcu_membership[1] = 0;
        p_jpeg->mcu_membership[2] = 0;
        p_jpeg->mcu_membership[3] = 0;
        p_jpeg->mcu_membership[4] = 1;
        p_jpeg->mcu_membership[5] = 2;
        p_jpeg->tab_membership[0] = 0;
        p_jpeg->tab_membership[1] = 0;
        p_jpeg->tab_membership[2] = 0;
        p_jpeg->tab_membership[3] = 0;
        p_jpeg->tab_membership[4] = 1;
        p_jpeg->tab_membership[5] = 1;
        p_jpeg->subsample_x[0] = 1;
        p_jpeg->subsample_x[1] = 2;
        p_jpeg->subsample_x[2] = 2;
        p_jpeg->subsample_y[0] = 1;
        p_jpeg->subsample_y[1] = 2;
        p_jpeg->subsample_y[2] = 2;
    }
    else if (p_jpeg->frameheader[0].horizontal_sampling == 1
        && p_jpeg->frameheader[0].vertical_sampling == 1)
    {   /* 4:4:4 */
        /* don't overwrite p_jpeg->blocks */
        p_jpeg->x_mbl = (p_jpeg->x_size+7) / 8;
        p_jpeg->x_phys = p_jpeg->x_mbl * 8;
        p_jpeg->y_mbl = (p_jpeg->y_size+7) / 8;
        p_jpeg->y_phys = p_jpeg->y_mbl * 8;
        p_jpeg->mcu_membership[0] = 0;
        p_jpeg->mcu_membership[1] = 1;
        p_jpeg->mcu_membership[2] = 2;
        p_jpeg->tab_membership[0] = 0;
        p_jpeg->tab_membership[1] = 1;
        p_jpeg->tab_membership[2] = 1;
        p_jpeg->subsample_x[0] = 1;
        p_jpeg->subsample_x[1] = 1;
        p_jpeg->subsample_x[2] = 1;
        p_jpeg->subsample_y[0] = 1;
        p_jpeg->subsample_y[1] = 1;
        p_jpeg->subsample_y[2] = 1;
    }
    else
    {
        /* error */
    }

}


/*
* These functions/macros provide the in-line portion of bit fetching.
* Use check_bit_buffer to ensure there are N bits in get_buffer
* before using get_bits, peek_bits, or drop_bits.
*  check_bit_buffer(state,n,action);
*    Ensure there are N bits in get_buffer; if suspend, take action.
*  val = get_bits(n);
*    Fetch next N bits.
*  val = peek_bits(n);
*    Fetch next N bits without removing them from the buffer.
*  drop_bits(n);
*    Discard next N bits.
* The value N should be a simple variable, not an expression, because it
* is evaluated multiple times.
*/

INLINE void check_bit_buffer(struct bitstream* pb, int nbits)
{
    if (pb->bits_left < nbits)
    {   /* nbits is <= 16, so I can always refill 2 bytes in this case */
        unsigned char byte;

        byte = *pb->next_input_byte++;
        if (byte == 0xFF) /* legal marker can be byte stuffing or RSTm */
        {   /* simplification: just skip the (one-byte) marker code */
            pb->next_input_byte++;
        }
        pb->get_buffer = (pb->get_buffer << 8) | byte;

        byte = *pb->next_input_byte++;
        if (byte == 0xFF) /* legal marker can be byte stuffing or RSTm */
        {   /* simplification: just skip the (one-byte) marker code */
            pb->next_input_byte++;
        }
        pb->get_buffer = (pb->get_buffer << 8) | byte;

        pb->bits_left += 16;
    }
}

INLINE int get_bits(struct bitstream* pb, int nbits)
{
    return ((int) (pb->get_buffer >> (pb->bits_left -= nbits))) & ((1<<nbits)-1);
}

INLINE int peek_bits(struct bitstream* pb, int nbits)
{
    return ((int) (pb->get_buffer >> (pb->bits_left - nbits))) & ((1<<nbits)-1);
}

INLINE void drop_bits(struct bitstream* pb, int nbits)
{
    pb->bits_left -= nbits;
}

/* re-synchronize to entropy data (skip restart marker) */
void search_restart(struct bitstream* pb)
{
    pb->next_input_byte--; /* we may have overread it, taking 2 bytes */
    /* search for a non-byte-padding marker, has to be RSTm or EOS */
    while (pb->next_input_byte < pb->input_end &&
        (pb->next_input_byte[-2] != 0xFF || pb->next_input_byte[-1] == 0x00))
    {
        pb->next_input_byte++;
    }
    pb->bits_left = 0;
}

/* Figure F.12: extend sign bit. */
#define HUFF_EXTEND(x,s)  ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))

static const int extend_test[16] =   /* entry n is 2**(n-1) */
{
    0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
    0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000
};

static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
{
    0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
    ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
    ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
    ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1
};

/* Decode a single value */
INLINE int huff_decode_dc(struct bitstream* bs, struct derived_tbl* tbl)
{
    int nb, look, s, r;

    check_bit_buffer(bs, HUFF_LOOKAHEAD);
    look = peek_bits(bs, HUFF_LOOKAHEAD);
    if ((nb = tbl->look_nbits[look]) != 0)
    {
        drop_bits(bs, nb);
        s = tbl->look_sym[look];
        check_bit_buffer(bs, s);
        r = get_bits(bs, s);
        s = HUFF_EXTEND(r, s);
    }
    else
    {   /*  slow_DECODE(s, HUFF_LOOKAHEAD+1)) < 0); */
        long code;
        nb=HUFF_LOOKAHEAD+1;
        check_bit_buffer(bs, nb);
        code = get_bits(bs, nb);
        while (code > tbl->maxcode[nb])
        {
            code <<= 1;
            check_bit_buffer(bs, 1);
            code |= get_bits(bs, 1);
            nb++;
        }
        if (nb > 16) /* error in Huffman */
        {
            s=0; /* fake a zero, this is most safe */
        }
        else
        {
            s = tbl->pub[16 + tbl->valptr[nb] + ((int) (code - tbl->mincode[nb])) ];
            check_bit_buffer(bs, s);
            r = get_bits(bs, s);
            s = HUFF_EXTEND(r, s);
        }
    } /* end slow decode */
    return s;
}

INLINE int huff_decode_ac(struct bitstream* bs, struct derived_tbl* tbl)
{
    int nb, look, s;

    check_bit_buffer(bs, HUFF_LOOKAHEAD);
    look = peek_bits(bs, HUFF_LOOKAHEAD);
    if ((nb = tbl->look_nbits[look]) != 0)
    {
        drop_bits(bs, nb);
        s = tbl->look_sym[look];
    }
    else
    {   /*  slow_DECODE(s, HUFF_LOOKAHEAD+1)) < 0); */
        long code;
        nb=HUFF_LOOKAHEAD+1;
        check_bit_buffer(bs, nb);
        code = get_bits(bs, nb);
        while (code > tbl->maxcode[nb])
        {
            code <<= 1;
            check_bit_buffer(bs, 1);
            code |= get_bits(bs, 1);
            nb++;
        }
        if (nb > 16) /* error in Huffman */
        {
            s=0; /* fake a zero, this is most safe */
        }
        else
        {
            s = tbl->pub[16 + tbl->valptr[nb] + ((int) (code - tbl->mincode[nb])) ];
        }
    } /* end slow decode */
    return s;
}


#ifdef HAVE_LCD_COLOR

/* JPEG decoder variant for YUV decoding, into 3 different planes */
/*  Note: it keeps the original color subsampling, even if resized. */
int jpeg_decode(struct jpeg* p_jpeg, unsigned char* p_pixel[3],
                int downscale, void (*pf_progress)(int current, int total))
{
    struct bitstream bs; /* bitstream "object" */
    int block[64]; /* decoded DCT coefficients */

    int width, height;
    int skip_line[3]; /* bytes from one line to the next (skip_line) */
    int skip_strip[3], skip_mcu[3]; /* bytes to next DCT row / column */

    int i, x, y; /* loop counter */

    unsigned char* p_line[3] = {p_pixel[0], p_pixel[1], p_pixel[2]};
    unsigned char* p_byte[3]; /* bitmap pointer */

    void (*pf_idct)(unsigned char*, int*, int*, int); /* selected IDCT */
    int k_need; /* AC coefficients needed up to here */
    int zero_need; /* init the block with this many zeros */

    int last_dc_val[3] = {0, 0, 0}; /* or 128 for chroma? */
    int store_offs[4]; /* memory offsets: order of Y11 Y12 Y21 Y22 U V */
    int restart = p_jpeg->restart_interval; /* MCUs until restart marker */

    /* pick the IDCT we want, determine how to work with coefs */
    if (downscale == 1)
    {
        pf_idct = idct8x8;
        k_need = 64; /* all */
        zero_need = 63; /* all */
    }
    else if (downscale == 2)
    {
        pf_idct = idct4x4;
        k_need = 25; /* this far in zig-zag to cover 4*4 */
        zero_need = 27; /* clear this far in linear order */
    }
    else if (downscale == 4)
    {
        pf_idct = idct2x2;
        k_need = 5; /* this far in zig-zag to cover 2*2 */
        zero_need = 9; /* clear this far in linear order */
    }
    else if (downscale == 8)
    {
        pf_idct = idct1x1;
        k_need = 0; /* no AC, not needed */
        zero_need = 0; /* no AC, not needed */
    }
    else return -1; /* not supported */

    /* init bitstream, fake a restart to make it start */
    bs.next_input_byte = p_jpeg->p_entropy_data;
    bs.bits_left = 0;
    bs.input_end = p_jpeg->p_entropy_end;

    width  = p_jpeg->x_phys / downscale;
    height = p_jpeg->y_phys / downscale;
    for (i=0; i<3; i++) /* calculate some strides */
    {
        skip_line[i] = width / p_jpeg->subsample_x[i];
        skip_strip[i] = skip_line[i]
                        * (height / p_jpeg->y_mbl) / p_jpeg->subsample_y[i];
        skip_mcu[i] = width/p_jpeg->x_mbl / p_jpeg->subsample_x[i];
    }

    /* prepare offsets about where to store the different blocks */
    store_offs[p_jpeg->store_pos[0]] = 0;
    store_offs[p_jpeg->store_pos[1]] = 8 / downscale; /* to the right */
    store_offs[p_jpeg->store_pos[2]] = width * 8 / downscale; /* below */
    store_offs[p_jpeg->store_pos[3]] = store_offs[1] + store_offs[2]; /* r+b */

    for(y=0; y<p_jpeg->y_mbl && bs.next_input_byte <= bs.input_end; y++)
    {
        for (i=0; i<3; i++) /* scan line init */
        {
            p_byte[i] = p_line[i];
            p_line[i] += skip_strip[i];
        }
        for (x=0; x<p_jpeg->x_mbl; x++)
        {
            int blkn;

            /* Outer loop handles each block in the MCU */
            for (blkn = 0; blkn < p_jpeg->blocks; blkn++)
            {   /* Decode a single block's worth of coefficients */
                int k = 1; /* coefficient index */
                int s, r; /* huffman values */
                int ci = p_jpeg->mcu_membership[blkn]; /* component index */
                int ti = p_jpeg->tab_membership[blkn]; /* table index */
                struct derived_tbl* dctbl = &p_jpeg->dc_derived_tbls[ti];
                struct derived_tbl* actbl = &p_jpeg->ac_derived_tbls[ti];

                /* Section F.2.2.1: decode the DC coefficient difference */
                s = huff_decode_dc(&bs, dctbl);

                last_dc_val[ci] += s;
                block[0] = last_dc_val[ci]; /* output it (assumes zag[0] = 0) */

                /* coefficient buffer must be cleared */
                MEMSET(block+1, 0, zero_need*sizeof(block[0]));

                /* Section F.2.2.2: decode the AC coefficients */
                for (; k < k_need; k++)
                {
                    s = huff_decode_ac(&bs, actbl);
                    r = s >> 4;
                    s &= 15;

                    if (s)
                    {
                        k += r;
                        check_bit_buffer(&bs, s);
                        r = get_bits(&bs, s);
                        block[zag[k]] = HUFF_EXTEND(r, s);
                    }
                    else
                    {
                        if (r != 15)
                        {
                            k = 64;
                            break;
                        }
                        k += r;
                    }
                }  /* for k */
                /* In this path we just discard the values */
                for (; k < 64; k++)
                {
                    s = huff_decode_ac(&bs, actbl);
                    r = s >> 4;
                    s &= 15;

                    if (s)
                    {
                        k += r;
                        check_bit_buffer(&bs, s);
                        drop_bits(&bs, s);
                    }
                    else
                    {
                        if (r != 15)
                            break;
                        k += r;
                    }
                }  /* for k */

                if (ci == 0)
                {   /* Y component needs to bother about block store */
                    pf_idct(p_byte[0]+store_offs[blkn], block,
                        p_jpeg->qt_idct[ti], skip_line[0]);
                }
                else
                {   /* chroma */
                    pf_idct(p_byte[ci], block, p_jpeg->qt_idct[ti],
                        skip_line[ci]);
                }
            } /* for blkn */
            p_byte[0] += skip_mcu[0]; /* unrolled for (i=0; i<3; i++) loop */
            p_byte[1] += skip_mcu[1];
            p_byte[2] += skip_mcu[2];
            if (p_jpeg->restart_interval && --restart == 0)
            {   /* if a restart marker is due: */
                restart = p_jpeg->restart_interval; /* count again */
                search_restart(&bs); /* align the bitstream */
                last_dc_val[0] = last_dc_val[1] =
                                 last_dc_val[2] = 0; /* reset decoder */
            }
        } /* for x */
        if (pf_progress != NULL)
            pf_progress(y, p_jpeg->y_mbl-1); /* notify about decoding progress */
    } /* for y */

    return 0; /* success */
}
#else /* !HAVE_LCD_COLOR */

/* a JPEG decoder specialized in decoding only the luminance (b&w) */
int jpeg_decode(struct jpeg* p_jpeg, unsigned char* p_pixel[1], int downscale,
                void (*pf_progress)(int current, int total))
{
    struct bitstream bs; /* bitstream "object" */
    int block[64]; /* decoded DCT coefficients */

    int width, height;
    int skip_line; /* bytes from one line to the next (skip_line) */
    int skip_strip, skip_mcu; /* bytes to next DCT row / column */

    int x, y; /* loop counter */

    unsigned char* p_line = p_pixel[0];
    unsigned char* p_byte; /* bitmap pointer */

    void (*pf_idct)(unsigned char*, int*, int*, int); /* selected IDCT */
    int k_need; /* AC coefficients needed up to here */
    int zero_need; /* init the block with this many zeros */

    int last_dc_val = 0;
    int store_offs[4]; /* memory offsets: order of Y11 Y12 Y21 Y22 U V */
    int restart = p_jpeg->restart_interval; /* MCUs until restart marker */

    /* pick the IDCT we want, determine how to work with coefs */
    if (downscale == 1)
    {
        pf_idct = idct8x8;
        k_need = 64; /* all */
        zero_need = 63; /* all */
    }
    else if (downscale == 2)
    {
        pf_idct = idct4x4;
        k_need = 25; /* this far in zig-zag to cover 4*4 */
        zero_need = 27; /* clear this far in linear order */
    }
    else if (downscale == 4)
    {
        pf_idct = idct2x2;
        k_need = 5; /* this far in zig-zag to cover 2*2 */
        zero_need = 9; /* clear this far in linear order */
    }
    else if (downscale == 8)
    {
        pf_idct = idct1x1;
        k_need = 0; /* no AC, not needed */
        zero_need = 0; /* no AC, not needed */
    }
    else return -1; /* not supported */

    /* init bitstream, fake a restart to make it start */
    bs.next_input_byte = p_jpeg->p_entropy_data;
    bs.bits_left = 0;
    bs.input_end = p_jpeg->p_entropy_end;

    width  = p_jpeg->x_phys / downscale;
    height = p_jpeg->y_phys / downscale;
    skip_line = width;
    skip_strip = skip_line * (height / p_jpeg->y_mbl);
    skip_mcu = (width/p_jpeg->x_mbl);

    /* prepare offsets about where to store the different blocks */
    store_offs[p_jpeg->store_pos[0]] = 0;
    store_offs[p_jpeg->store_pos[1]] = 8 / downscale; /* to the right */
    store_offs[p_jpeg->store_pos[2]] = width * 8 / downscale; /* below */
    store_offs[p_jpeg->store_pos[3]] = store_offs[1] + store_offs[2]; /* r+b */

    for(y=0; y<p_jpeg->y_mbl && bs.next_input_byte <= bs.input_end; y++)
    {
        p_byte = p_line;
        p_line += skip_strip;
        for (x=0; x<p_jpeg->x_mbl; x++)
        {
            int blkn;

            /* Outer loop handles each block in the MCU */
            for (blkn = 0; blkn < p_jpeg->blocks; blkn++)
            {   /* Decode a single block's worth of coefficients */
                int k = 1; /* coefficient index */
                int s, r; /* huffman values */
                int ci = p_jpeg->mcu_membership[blkn]; /* component index */
                int ti = p_jpeg->tab_membership[blkn]; /* table index */
                struct derived_tbl* dctbl = &p_jpeg->dc_derived_tbls[ti];
                struct derived_tbl* actbl = &p_jpeg->ac_derived_tbls[ti];

                /* Section F.2.2.1: decode the DC coefficient difference */
                s = huff_decode_dc(&bs, dctbl);

                if (ci == 0) /* only for Y component */
                {
                    last_dc_val += s;
                    block[0] = last_dc_val; /* output it (assumes zag[0] = 0) */

                    /* coefficient buffer must be cleared */
                    MEMSET(block+1, 0, zero_need*sizeof(block[0]));

                    /* Section F.2.2.2: decode the AC coefficients */
                    for (; k < k_need; k++)
                    {
                        s = huff_decode_ac(&bs, actbl);
                        r = s >> 4;
                        s &= 15;

                        if (s)
                        {
                            k += r;
                            check_bit_buffer(&bs, s);
                            r = get_bits(&bs, s);
                            block[zag[k]] = HUFF_EXTEND(r, s);
                        }
                        else
                        {
                            if (r != 15)
                            {
                                k = 64;
                                break;
                            }
                            k += r;
                        }
                    }  /* for k */
                }
                /* In this path we just discard the values */
                for (; k < 64; k++)
                {
                    s = huff_decode_ac(&bs, actbl);
                    r = s >> 4;
                    s &= 15;

                    if (s)
                    {
                        k += r;
                        check_bit_buffer(&bs, s);
                        drop_bits(&bs, s);
                    }
                    else
                    {
                        if (r != 15)
                            break;
                        k += r;
                    }
                }  /* for k */

                if (ci == 0)
                {   /* only for Y component */
                    pf_idct(p_byte+store_offs[blkn], block, p_jpeg->qt_idct[ti],
                        skip_line);
                }
            } /* for blkn */
            p_byte += skip_mcu;
            if (p_jpeg->restart_interval && --restart == 0)
            {   /* if a restart marker is due: */
                restart = p_jpeg->restart_interval; /* count again */
                search_restart(&bs); /* align the bitstream */
                last_dc_val = 0; /* reset decoder */
            }
        } /* for x */
        if (pf_progress != NULL)
            pf_progress(y, p_jpeg->y_mbl-1); /* notify about decoding progress */
    } /* for y */

    return 0; /* success */
}
#endif /* !HAVE_LCD_COLOR */

/**************** end JPEG code ********************/



/**************** begin Application ********************/


/************************* Types ***************************/

struct t_disp
{
#ifdef HAVE_LCD_COLOR
    unsigned char* bitmap[3]; /* Y, Cr, Cb */
    int csub_x, csub_y;
#else
    unsigned char* bitmap[1]; /* Y only */
#endif
    int width;
    int height;
    int stride;
    int x, y;
};

/************************* Globals ***************************/

/* decompressed image in the possible sizes (1,2,4,8), wasting the other */
struct t_disp disp[9];

/* my memory pool (from the mp3 buffer) */
char print[32]; /* use a common snprintf() buffer */
unsigned char* buf; /* up to here currently used by image(s) */

/* the remaining free part of the buffer for compressed+uncompressed images */
unsigned char* buf_images;

ssize_t buf_size, buf_images_size;
/* the root of the images, hereafter are decompresed ones */
unsigned char* buf_root;
int root_size;

int ds, ds_min, ds_max; /* downscaling and limits */
static struct jpeg jpg; /* too large for stack */

static struct tree_context *tree;

/* the current full file name */
static char np_file[MAX_PATH];
int curfile = 0, direction = DIR_NONE, entries = 0;

/* list of the jpeg files */
char **file_pt;
/* are we using the plugin buffer or the audio buffer? */
bool plug_buf = false;


/************************* Implementation ***************************/

#ifdef HAVE_LCD_COLOR
/*
 * Conversion of full 0-255 range YCrCb to RGB:
 *   |R|   |1.000000 -0.000001  1.402000| |Y'|
 *   |G| = |1.000000 -0.334136 -0.714136| |Pb|
 *   |B|   |1.000000  1.772000  0.000000| |Pr|
 * Scaled (yields s15-bit output):
 *   |R|   |128    0  179| |Y       |
 *   |G| = |128  -43  -91| |Cb - 128|
 *   |B|   |128  227    0| |Cr - 128|
 */
#define YFAC            128
#define RVFAC           179
#define GUFAC           (-43)
#define GVFAC           (-91)
#define BUFAC           227
#define YUV_WHITE       (255*YFAC)
#define NODITHER_DELTA  (127*YFAC)
#define COMPONENT_SHIFT  15
#define MATRIX_SHIFT      7

static inline int clamp_component(int x)
{
    if ((unsigned)x > YUV_WHITE)
        x = x < 0 ? 0 : YUV_WHITE;
    return x;
}

static inline int clamp_component_bits(int x, int bits)
{
    if ((unsigned)x > (1u << bits) - 1)
        x = x < 0 ? 0 : (1 << bits) - 1;
    return x;
}

static inline int component_to_lcd(int x, int bits, int delta)
{
    /* Formula used in core bitmap loader. */
    return (((1 << bits) - 1)*x + (x >> (8 - bits)) + delta) >> COMPONENT_SHIFT;
}

static inline int lcd_to_component(int x, int bits, int delta)
{
    /* Reasonable, approximate reversal to get a full range back from the
       quantized value. */
    return YUV_WHITE*x / ((1 << bits) - 1);
    (void)delta;
}

#define RED 0
#define GRN 1
#define BLU 2

struct rgb_err
{
    int16_t errbuf[LCD_WIDTH+2]; /* Error record for line below            */
} rgb_err_buffers[3];

fb_data rgb_linebuf[LCD_WIDTH];  /* Line buffer for scrolling when
                                    DITHER_DIFFUSION is set                */

struct rgb_pixel
{
    int r, g, b;                 /* Current pixel components in s16.0      */
    int inc;                     /* Current line increment (-1 or 1)       */
    int row;                     /* Current row in source image            */
    int col;                     /* Current column in source image         */
    int ce[3];                   /* Errors to apply to current pixel       */
    struct rgb_err *e;           /* RED, GRN, BLU                          */
    int epos;                    /* Current position in error record       */
};

struct rgb_pixel *pixel;

/** round and truncate to lcd depth **/
static fb_data pixel_to_lcd_colour(void)
{
    struct rgb_pixel *p = pixel;
    int r, g, b;

    r = component_to_lcd(p->r, LCD_RED_BITS, NODITHER_DELTA);
    r = clamp_component_bits(r, LCD_RED_BITS);

    g = component_to_lcd(p->g, LCD_GREEN_BITS, NODITHER_DELTA);
    g = clamp_component_bits(g, LCD_GREEN_BITS);

    b = component_to_lcd(p->b, LCD_BLUE_BITS, NODITHER_DELTA);
    b = clamp_component_bits(b, LCD_BLUE_BITS);

    return LCD_RGBPACK_LCD(r, g, b);
}

/** write a monochrome pixel to the colour LCD **/
static fb_data pixel_to_lcd_gray(void)
{
    int r, g, b;

    g = clamp_component(pixel->g);
    r = component_to_lcd(g, LCD_RED_BITS, NODITHER_DELTA);
    b = component_to_lcd(g, LCD_BLUE_BITS, NODITHER_DELTA);
    g = component_to_lcd(g, LCD_GREEN_BITS, NODITHER_DELTA);

    return LCD_RGBPACK_LCD(r, g, b);
}

/**
 * Bayer ordered dithering - swiped from the core bitmap loader.
 */
static fb_data pixel_odither_to_lcd(void)
{
    /* canonical ordered dither matrix */
    static const unsigned char dither_matrix[16][16] = {
        {   0,192, 48,240, 12,204, 60,252,  3,195, 51,243, 15,207, 63,255 },
        { 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
        {  32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
        { 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
        {   8,200, 56,248,  4,196, 52,244, 11,203, 59,251,  7,199, 55,247 },
        { 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
        {  40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
        { 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
        {   2,194, 50,242, 14,206, 62,254,  1,193, 49,241, 13,205, 61,253 },
        { 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
        {  34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
        { 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
        {  10,202, 58,250,  6,198, 54,246,  9,201, 57,249,  5,197, 53,245 },
        { 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
        {  42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },