/elec/propeller-clock

/*

 * text_renderer.cc

 *

 * Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.

 *

 * This file is part of propeller-clock (hereafter referred to as "this

 * program"). See http://ed.am/dev/software/arduino/propeller-clock for more

 * information.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published

 * by the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include "text_renderer.h"

#include "config.h"

#include "Arduino.h"

#include <avr/pgmspace.h>

#include "display.h"

#define MAX_MESSAGE_LENGTH 64

// the buffer for the message

static char _message_buffer[ MAX_MESSAGE_LENGTH ];

// the current message

static PString _message( _message_buffer, sizeof( _message_buffer ) );

// cached glyph

static char _glyph_cache[ 8 ];

// the character the current cached glyph is for

static char _glyph_cache_char;

// selected font

static int _font = 0;

// time last frame

static unsigned long _last_millis;

// duration last frame (in case we can't calculate it this frame!)

static unsigned long _duration;

// scroll position (in segments )

static signed long _scroll;

// cache a glyph

void cache_glyph( char c )

{

	static char fonts[][ 66 * 8 ] PROGMEM = {

		{ // INVD-A

			0x00, 0x7c, 0x7e, 0x12, 0x12, 0x12, 0x7e, 0x7c, // A

			0x00, 0x7e, 0x7e, 0x4a, 0x4a, 0x4a, 0x7e, 0x34, // B

			0x00, 0x3c, 0x7e, 0x42, 0x42, 0x42, 0x66, 0x24, // C

			0x00, 0x7e, 0x7e, 0x42, 0x42, 0x66, 0x3c, 0x18, // D

			0x00, 0x7e, 0x7e, 0x4a, 0x4a, 0x4a, 0x42, 0x00, // E

			0x00, 0x7e, 0x7e, 0x0a, 0x0a, 0x0a, 0x02, 0x00, // F

			0x00, 0x3c, 0x7e, 0x42, 0x52, 0x52, 0x76, 0x34, // G

			0x00, 0x7e, 0x7e, 0x08, 0x08, 0x08, 0x7e, 0x7e, // H

			0x00, 0x42, 0x42, 0x7e, 0x7e, 0x42, 0x42, 0x00, // I

			0x00, 0x30, 0x70, 0x40, 0x40, 0x40, 0x7e, 0x3e, // J

			0x00, 0x7e, 0x7e, 0x08, 0x1c, 0x36, 0x62, 0x40, // K

			0x00, 0x7e, 0x7e, 0x40, 0x40, 0x40, 0x40, 0x00, // L

			0x00, 0x7e, 0x7e, 0x0c, 0x18, 0x0c, 0x7e, 0x7e, // M

			0x00, 0x7e, 0x7e, 0x0c, 0x18, 0x30, 0x7e, 0x7e, // N

			0x00, 0x3c, 0x7e, 0x42, 0x42, 0x42, 0x7e, 0x3c, // O

			0x00, 0x7e, 0x7e, 0x12, 0x12, 0x12, 0x1e, 0x0c, // P

			0x00, 0x3c, 0x7e, 0x52, 0x52, 0x62, 0x7e, 0x3c, // Q

			0x00, 0x7e, 0x7e, 0x12, 0x12, 0x32, 0x7e, 0x4c, // R

			0x00, 0x24, 0x6e, 0x4a, 0x4a, 0x4a, 0x7a, 0x30, // S

			0x00, 0x02, 0x02, 0x7e, 0x7e, 0x02, 0x02, 0x00, // T

			0x00, 0x3e, 0x7e, 0x40, 0x40, 0x40, 0x7e, 0x3e, // U

			0x00, 0x1e, 0x3e, 0x60, 0x40, 0x60, 0x3e, 0x1e, // V

			0x00, 0x3e, 0x7e, 0x60, 0x30, 0x60, 0x7e, 0x3e, // W

			0x00, 0x42, 0x66, 0x3c, 0x18, 0x3c, 0x66, 0x42, // X

			0x02, 0x06, 0x0c, 0x78, 0x78, 0x0c, 0x06, 0x02, // Y

			0x00, 0x42, 0x62, 0x72, 0x5a, 0x4e, 0x46, 0x42, // Z

			0x00, 0x20, 0x74, 0x54, 0x54, 0x7c, 0x78, 0x00, // a

			0x00, 0x00, 0x7e, 0x7e, 0x48, 0x48, 0x78, 0x30, // b

			0x00, 0x00, 0x38, 0x7c, 0x44, 0x44, 0x00, 0x00, // c

			0x00, 0x30, 0x78, 0x48, 0x48, 0x7e, 0x7e, 0x00, // d

			0x00, 0x38, 0x7c, 0x54, 0x54, 0x5c, 0x08, 0x00, // e

			0x00, 0x00, 0x7c, 0x7e, 0x0a, 0x02, 0x00, 0x00, // f

			0x00, 0x18, 0xbc, 0xa4, 0xa4, 0xfc, 0x7c, 0x00, // g

			0x00, 0x7e, 0x7e, 0x08, 0x08, 0x78, 0x70, 0x00, // h

			0x00, 0x00, 0x48, 0x7a, 0x7a, 0x40, 0x00, 0x00, // i

			0x00, 0x00, 0x40, 0xc0, 0x80, 0xfa, 0x7a, 0x00, // j

			0x00, 0x00, 0x7e, 0x7e, 0x10, 0x3c, 0x64, 0x40, // k

			0x00, 0x00, 0x00, 0x3e, 0x7e, 0x40, 0x40, 0x00, // l

			0x7c, 0x7c, 0x04, 0x78, 0x7c, 0x04, 0x7c, 0x78, // m

			0x00, 0x7c, 0x7c, 0x04, 0x04, 0x7c, 0x78, 0x00, // n

			0x00, 0x38, 0x7c, 0x44, 0x44, 0x7c, 0x38, 0x00, // o

			0x00, 0xfc, 0xfc, 0x24, 0x24, 0x3c, 0x18, 0x00, // p

			0x00, 0x18, 0x3c, 0x24, 0x24, 0xfc, 0xfc, 0x80, // q

			0x00, 0x00, 0x78, 0x7c, 0x04, 0x04, 0x00, 0x00, // r

			0x00, 0x48, 0x5c, 0x54, 0x54, 0x74, 0x20, 0x00, // s

			0x00, 0x04, 0x3e, 0x7e, 0x44, 0x44, 0x00, 0x00, // t

			0x00, 0x3c, 0x7c, 0x40, 0x40, 0x7c, 0x3c, 0x00, // u

			0x00, 0x0c, 0x3c, 0x70, 0x60, 0x3c, 0x0c, 0x00, // v

			0x3c, 0x7c, 0x40, 0x30, 0x40, 0x7c, 0x3c, 0x00, // w

			0x00, 0x44, 0x6c, 0x38, 0x38, 0x6c, 0x44, 0x00, // x

			0x00, 0x1c, 0xbc, 0xa0, 0xa0, 0xfc, 0x7c, 0x00, // y

			0x00, 0x44, 0x64, 0x74, 0x5c, 0x4c, 0x44, 0x00, // z

			0x00, 0x3c, 0x7e, 0x52, 0x4a, 0x46, 0x7e, 0x3c, // 0

			0x00, 0x00, 0x44, 0x44, 0x7e, 0x7e, 0x40, 0x40, // 1

			0x00, 0x64, 0x76, 0x52, 0x52, 0x52, 0x5e, 0x4c, // 2

			0x00, 0x24, 0x66, 0x42, 0x4a, 0x4a, 0x7e, 0x34, // 3

			0x00, 0x30, 0x28, 0x24, 0x7e, 0x7e, 0x20, 0x20, // 4

			0x00, 0x2e, 0x6e, 0x4a, 0x4a, 0x4a, 0x7a, 0x32, // 5

			0x00, 0x3c, 0x7e, 0x4a, 0x4a, 0x4a, 0x7a, 0x30, // 6

			0x00, 0x02, 0x02, 0x62, 0x72, 0x1a, 0x0e, 0x06, // 7

			0x00, 0x34, 0x7e, 0x4a, 0x4a, 0x4a, 0x7e, 0x34, // 8

			0x00, 0x0c, 0x5e, 0x52, 0x52, 0x52, 0x7e, 0x3c, // 9

			0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, // -

			0x00, 0x00, 0x00, 0x6c, 0x6c, 0x00, 0x00, 0x00, // :

			0x00, 0x00, 0x00, 0x60, 0x60, 0x00, 0x00, 0x00, // .

			0x00, 0x00, 0x00, 0x80, 0xe0, 0x60, 0x00, 0x00, // ,

		}, { // INVD-D

			0x00, 0x7f, 0x7f, 0x09, 0x09, 0x09, 0x7f, 0x7f, // A

			0x00, 0x7f, 0x7f, 0x49, 0x49, 0x49, 0x7f, 0x77, // B

			0x00, 0x7f, 0x7f, 0x41, 0x41, 0x41, 0x77, 0x77, // C

			0x00, 0x7f, 0x7f, 0x41, 0x41, 0x41, 0x7f, 0x3e, // D

			0x00, 0x7f, 0x7f, 0x49, 0x49, 0x49, 0x63, 0x63, // E

			0x00, 0x7f, 0x7f, 0x09, 0x09, 0x09, 0x03, 0x03, // F

			0x00, 0x7f, 0x7f, 0x41, 0x49, 0x49, 0x7b, 0x7b, // G

			0x00, 0x7f, 0x7f, 0x08, 0x08, 0x08, 0x7f, 0x7f, // H

			0x00, 0x41, 0x41, 0x7f, 0x7f, 0x41, 0x41, 0x00, // I

			0x00, 0x60, 0x60, 0x40, 0x40, 0x40, 0x7f, 0x7f, // J

			0x00, 0x7f, 0x7f, 0x08, 0x08, 0x08, 0x7f, 0x77, // K

			0x00, 0x7f, 0x7f, 0x40, 0x40, 0x40, 0x60, 0x60, // L

			0x00, 0x7f, 0x7f, 0x02, 0x04, 0x02, 0x7f, 0x7f, // M

			0x00, 0x7f, 0x7f, 0x06, 0x0c, 0x18, 0x7f, 0x7f, // N

			0x00, 0x7f, 0x7f, 0x41, 0x41, 0x41, 0x7f, 0x7f, // O

			0x00, 0x7f, 0x7f, 0x09, 0x09, 0x09, 0x0f, 0x0f, // P

			0x00, 0x7f, 0x7f, 0x41, 0x51, 0x21, 0x7f, 0x7f, // Q

			0x00, 0x7f, 0x7f, 0x09, 0x09, 0x09, 0x7f, 0x77, // R

			0x00, 0x6f, 0x6f, 0x49, 0x49, 0x49, 0x7b, 0x7b, // S

			0x00, 0x01, 0x01, 0x7f, 0x7f, 0x01, 0x01, 0x00, // T

			0x00, 0x7f, 0x7f, 0x40, 0x40, 0x40, 0x7f, 0x7f, // U

			0x00, 0x1f, 0x3f, 0x60, 0x40, 0x60, 0x3f, 0x1f, // V

			0x00, 0x7f, 0x7f, 0x20, 0x10, 0x20, 0x7f, 0x7f, // W

			0x00, 0x77, 0x7f, 0x08, 0x08, 0x08, 0x7f, 0x77, // X

			0x00, 0x6f, 0x6f, 0x48, 0x48, 0x48, 0x7f, 0x7f, // Y

			0x00, 0x63, 0x73, 0x59, 0x4d, 0x47, 0x63, 0x61, // Z

			0x00, 0x74, 0x74, 0x54, 0x54, 0x7c, 0x7c, 0x00, // a

			0x00, 0x7f, 0x7f, 0x44, 0x44, 0x7c, 0x7c, 0x00, // b

			0x00, 0x7c, 0x7c, 0x44, 0x44, 0x6c, 0x6c, 0x00, // c

			0x00, 0x7c, 0x7c, 0x44, 0x44, 0x7f, 0x7f, 0x00, // d

			0x00, 0x7c, 0x7c, 0x54, 0x54, 0x5c, 0x5c, 0x00, // e

			0x00, 0x00, 0x04, 0x7f, 0x7f, 0x05, 0x05, 0x01, // f

			0x00, 0xbc, 0xbc, 0xa4, 0xa4, 0xfc, 0xfc, 0x00, // g

			0x00, 0x7f, 0x7f, 0x04, 0x04, 0x7c, 0x7c, 0x00, // h

			0x00, 0x44, 0x44, 0x7d, 0x7d, 0x40, 0x40, 0x00, // i

			0x00, 0x80, 0x80, 0xfd, 0xfd, 0x00, 0x00, 0x00, // j

			0x00, 0x7f, 0x7f, 0x10, 0x10, 0x7c, 0x6c, 0x00, // k

			0x00, 0x00, 0x00, 0x7f, 0x7f, 0x40, 0x40, 0x00, // l

			0x00, 0x7c, 0x7c, 0x04, 0x7c, 0x04, 0x7c, 0x7c, // m

			0x00, 0x7c, 0x7c, 0x04, 0x04, 0x7c, 0x7c, 0x00, // n

			0x00, 0x7c, 0x7c, 0x44, 0x44, 0x7c, 0x7c, 0x00, // o

			0x00, 0xfc, 0xfc, 0x24, 0x24, 0x3c, 0x3c, 0x00, // p

			0x00, 0x3c, 0x3c, 0x24, 0x24, 0xfc, 0xfc, 0x00, // q

			0x00, 0x7c, 0x7c, 0x04, 0x04, 0x0c, 0x0c, 0x00, // r

			0x00, 0x5c, 0x5c, 0x54, 0x54, 0x74, 0x74, 0x00, // s

			0x00, 0x00, 0x04, 0x7f, 0x7f, 0x44, 0x44, 0x00, // t

			0x00, 0x7c, 0x7c, 0x40, 0x40, 0x7c, 0x7c, 0x00, // u

			0x00, 0x1c, 0x3c, 0x60, 0x60, 0x3c, 0x1c, 0x00, // v

			0x00, 0x7c, 0x7c, 0x40, 0x7c, 0x40, 0x7c, 0x7c, // w

			0x00, 0x6c, 0x7c, 0x10, 0x10, 0x7c, 0x6c, 0x00, // x

			0x00, 0xbc, 0xbc, 0xa0, 0xa0, 0xfc, 0xfc, 0x00, // y

			0x00, 0x64, 0x74, 0x54, 0x54, 0x5c, 0x4c, 0x00, // z

			0x00, 0x7f, 0x7f, 0x51, 0x49, 0x45, 0x7f, 0x7f, // 0

			0x00, 0x41, 0x41, 0x7f, 0x7f, 0x40, 0x40, 0x00, // 1

			0x00, 0x7b, 0x7b, 0x49, 0x49, 0x49, 0x4f, 0x4f, // 2

			0x00, 0x63, 0x63, 0x49, 0x49, 0x49, 0x7f, 0x7f, // 3

			0x00, 0x1f, 0x1f, 0x10, 0x10, 0x7f, 0x7f, 0x10, // 4

			0x00, 0x6f, 0x6f, 0x49, 0x49, 0x49, 0x79, 0x79, // 5

			0x00, 0x7f, 0x7f, 0x49, 0x49, 0x49, 0x7b, 0x7b, // 6

			0x00, 0x03, 0x03, 0x71, 0x79, 0x0d, 0x07, 0x03, // 7

			0x00, 0x7f, 0x7f, 0x49, 0x49, 0x49, 0x7f, 0x7f, // 8

			0x00, 0x6f, 0x6f, 0x49, 0x49, 0x49, 0x7f, 0x7f, // 9

			0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, // -

			0x00, 0x00, 0x00, 0x66, 0x66, 0x00, 0x00, 0x00, // :

			0x00, 0x00, 0x00, 0x60, 0x60, 0x00, 0x00, 0x00, // .

			0x00, 0x00, 0x80, 0xe0, 0x60, 0x00, 0x00, 0x00, // ,

		}, { // INVD-G

			0x7c, 0x7e, 0x22, 0x7e, 0x7e, 0x7e, 0x7c, 0x00, // A

			0x7c, 0x7e, 0x7e, 0x7e, 0x4a, 0x7e, 0x34, 0x00, // B

			0x3c, 0x7e, 0x7e, 0x7e, 0x42, 0x76, 0x34, 0x00, // C

			0x7c, 0x7e, 0x7e, 0x7e, 0x42, 0x7e, 0x3c, 0x00, // D

			0x3c, 0x7e, 0x7e, 0x7e, 0x4a, 0x4a, 0x00, 0x00, // E

			0x7c, 0x7e, 0x7e, 0x7e, 0x12, 0x12, 0x00, 0x00, // F

			0x3c, 0x7e, 0x7e, 0x7e, 0x52, 0x76, 0x34, 0x00, // G

			0x7e, 0x7e, 0x7e, 0x7e, 0x08, 0x7e, 0x7e, 0x00, // H

			0x00, 0x42, 0x7e, 0x7e, 0x7e, 0x7e, 0x42, 0x00, // I

			0x30, 0x70, 0x42, 0x7e, 0x7e, 0x7e, 0x3e, 0x00, // J

			0x7e, 0x7e, 0x7e, 0x7e, 0x08, 0x76, 0x62, 0x00, // K

			0x00, 0x3e, 0x7e, 0x7e, 0x7e, 0x40, 0x40, 0x00, // L

			0x7e, 0x7e, 0x7e, 0x7c, 0x08, 0x7c, 0x7e, 0x00, // M

			0x7e, 0x7e, 0x7e, 0x7c, 0x08, 0x7e, 0x7e, 0x00, // N

			0x3c, 0x7e, 0x7e, 0x7e, 0x42, 0x7e, 0x3c, 0x00, // O

			0x7c, 0x7e, 0x7e, 0x7e, 0x12, 0x1e, 0x0c, 0x00, // P

			0x3c, 0x7e, 0x7e, 0x7e, 0x42, 0xfe, 0xbc, 0x00, // Q

			0x7c, 0x7e, 0x7e, 0x7e, 0x12, 0x7e, 0x6c, 0x00, // R

			0x24, 0x6e, 0x5e, 0x7e, 0x7a, 0x76, 0x24, 0x00, // S

			0x00, 0x02, 0x7e, 0x7e, 0x7e, 0x7e, 0x02, 0x00, // T

			0x3e, 0x7e, 0x7e, 0x7e, 0x40, 0x7e, 0x3e, 0x00, // U

			0x1e, 0x3e, 0x7e, 0x7e, 0x40, 0x3e, 0x1e, 0x00, // V

			0x3e, 0x7e, 0x7e, 0x7e, 0x20, 0x7e, 0x3e, 0x00, // W

			0x42, 0x66, 0x3e, 0x7e, 0x7c, 0x66, 0x42, 0x00, // X

			0x06, 0x0e, 0x7e, 0x7e, 0x70, 0x0e, 0x06, 0x00, // Y

			0x62, 0x72, 0x7a, 0x7e, 0x5e, 0x4e, 0x46, 0x00, // Z

			0x38, 0x7c, 0x44, 0x3c, 0x7c, 0x7c, 0x78, 0x00, // a

			0x3f, 0x7f, 0x7f, 0x7f, 0x44, 0x7c, 0x38, 0x00, // b

			0x38, 0x7c, 0x7c, 0x7c, 0x44, 0x6c, 0x28, 0x00, // c

			0x38, 0x7c, 0x44, 0x3f, 0x7f, 0x7f, 0x7f, 0x00, // d

			0x38, 0x7c, 0x7c, 0x7c, 0x54, 0x5c, 0x28, 0x00, // e

			0x88, 0xfe, 0xff, 0xff, 0x7f, 0x09, 0x0a, 0x00, // f

			0x58, 0xbc, 0xa4, 0xfc, 0xfc, 0xfc, 0x78, 0x00, // g

			0x7f, 0x7f, 0x7f, 0x7f, 0x04, 0x7c, 0x78, 0x00, // h

			0x00, 0x00, 0x7a, 0x7f, 0x7f, 0x7a, 0x00, 0x00, // i

			0x00, 0x80, 0xfa, 0xff, 0xff, 0x7a, 0x00, 0x00, // j

			0x7f, 0x7f, 0x7f, 0x7f, 0x24, 0x7c, 0x58, 0x00, // k

			0x00, 0x00, 0x3f, 0x7f, 0x7f, 0x7f, 0x40, 0x00, // l

			0x78, 0x7c, 0x7c, 0x04, 0x7c, 0x04, 0x7c, 0x78, // m

			0x7c, 0x7c, 0x7c, 0x78, 0x04, 0x7c, 0x78, 0x00, // n

			0x38, 0x7c, 0x7c, 0x7c, 0x44, 0x7c, 0x38, 0x00, // o

			0xfc, 0xfc, 0xfc, 0xf8, 0x44, 0x7c, 0x38, 0x00, // p

			0x38, 0x7c, 0x44, 0xfc, 0xfc, 0xfc, 0xf8, 0x00, // q

			0x7c, 0x7c, 0x7c, 0x7c, 0x04, 0x0c, 0x08, 0x00, // r

			0x28, 0x5c, 0x5c, 0x7c, 0x74, 0x74, 0x28, 0x00, // s

			0x04, 0x3e, 0x7e, 0x7e, 0x7e, 0x44, 0x24, 0x00, // t

			0x3c, 0x7c, 0x40, 0x3c, 0x7c, 0x7c, 0x7c, 0x00, // u

			0x1c, 0x3c, 0x7c, 0x7c, 0x60, 0x3c, 0x1c, 0x00, // v

			0x3c, 0x7c, 0x7c, 0x40, 0x7c, 0x40, 0x7c, 0x3c, // w

			0x44, 0x6c, 0x3c, 0x7c, 0x78, 0x6c, 0x44, 0x00, // x

			0x9c, 0xbc, 0xfc, 0xfc, 0x60, 0x3c, 0x1c, 0x00, // y

			0x64, 0x74, 0x3c, 0x7c, 0x5c, 0x4c, 0x24, 0x00, // z

			0x3c, 0x7e, 0x42, 0x7e, 0x7e, 0x7e, 0x3c, 0x00, // 0

			0x00, 0x42, 0x7e, 0x7e, 0x7e, 0x7e, 0x40, 0x00, // 1

			0x64, 0x72, 0x7a, 0x7e, 0x5e, 0x4e, 0x44, 0x00, // 2

			0x24, 0x66, 0x4a, 0x7e, 0x7e, 0x7e, 0x34, 0x00, // 3

			0x0e, 0x1e, 0x10, 0x7e, 0x7e, 0x7e, 0x7e, 0x00, // 4

			0x2e, 0x6e, 0x4e, 0x7a, 0x7a, 0x7a, 0x32, 0x00, // 5

			0x3c, 0x7e, 0x7e, 0x7e, 0x4a, 0x7a, 0x34, 0x00, // 6

			0x02, 0x62, 0x7a, 0x7e, 0x7e, 0x1e, 0x06, 0x00, // 7

			0x34, 0x7e, 0x4e, 0x7e, 0x7a, 0x7e, 0x34, 0x00, // 8

			0x2c, 0x5e, 0x52, 0x7e, 0x7e, 0x7e, 0x3c, 0x00, // 9

			0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, // -

			0x00, 0x00, 0x28, 0x7c, 0x7c, 0x28, 0x00, 0x00, // :

			0x00, 0x00, 0x30, 0x78, 0x78, 0x30, 0x00, 0x00, // .

			0x00, 0x00, 0x10, 0xb8, 0xf8, 0x70, 0x00, 0x00, // ,

		}, { // INVD-B

			0x00, 0x78, 0x7f, 0x09, 0x09, 0x0f, 0x78, 0x00, // A

			0x00, 0x7f, 0x79, 0x49, 0x49, 0x4f, 0x78, 0x00, // B

			0x00, 0x7f, 0x79, 0x41, 0x41, 0x41, 0x63, 0x00, // C

			0x00, 0x7f, 0x79, 0x41, 0x41, 0x41, 0x7f, 0x00, // D

			0x00, 0x00, 0x7f, 0x79, 0x49, 0x49, 0x41, 0x00, // E

			0x00, 0x00, 0x7f, 0x79, 0x09, 0x09, 0x01, 0x00, // F

			0x00, 0x7f, 0x79, 0x41, 0x41, 0x49, 0x7b, 0x00, // G

			0x00, 0x7f, 0x78, 0x08, 0x08, 0x08, 0x7f, 0x00, // H

			0x00, 0x00, 0x00, 0x7f, 0x78, 0x00, 0x00, 0x00, // I

			0x00, 0x60, 0x40, 0x40, 0x40, 0x7f, 0x78, 0x00, // J

			0x00, 0x7f, 0x78, 0x08, 0x08, 0x0f, 0x78, 0x00, // K

			0x00, 0x00, 0x7f, 0x78, 0x40, 0x40, 0x40, 0x00, // L

			0x00, 0x7f, 0x79, 0x01, 0x7f, 0x01, 0x7f, 0x00, // M

			0x00, 0x7f, 0x79, 0x01, 0x01, 0x01, 0x7f, 0x00, // N

			0x00, 0x7f, 0x41, 0x41, 0x41, 0x43, 0x7f, 0x00, // O

			0x00, 0x7f, 0x79, 0x09, 0x09, 0x09, 0x0f, 0x00, // P

			0x00, 0x7f, 0x41, 0x41, 0x61, 0x61, 0x7f, 0x00, // Q

			0x00, 0x7f, 0x79, 0x09, 0x09, 0x0f, 0x78, 0x00, // R

			0x00, 0x6f, 0x49, 0x49, 0x49, 0x79, 0x7b, 0x00, // S

			0x00, 0x01, 0x01, 0x7f, 0x79, 0x01, 0x01, 0x00, // T

			0x00, 0x7f, 0x78, 0x40, 0x40, 0x40, 0x7f, 0x00, // U

			0x00, 0x0f, 0x7f, 0x40, 0x40, 0x78, 0x0f, 0x00, // V

			0x00, 0x7f, 0x78, 0x40, 0x7f, 0x40, 0x7f, 0x00, // W

			0x00, 0x77, 0x78, 0x08, 0x08, 0x08, 0x77, 0x00, // X

			0x00, 0x0f, 0x08, 0x78, 0x78, 0x08, 0x0f, 0x00, // Y

			0x00, 0x7b, 0x79, 0x49, 0x49, 0x49, 0x6f, 0x00, // Z

			0x00, 0x74, 0x74, 0x54, 0x54, 0x7c, 0x00, 0x00, // a

			0x00, 0x7f, 0x74, 0x44, 0x44, 0x7c, 0x00, 0x00, // b

			0x00, 0x7c, 0x74, 0x44, 0x44, 0x6c, 0x00, 0x00, // c

			0x00, 0x7c, 0x74, 0x44, 0x44, 0x7f, 0x00, 0x00, // d

			0x00, 0x7c, 0x74, 0x54, 0x54, 0x5c, 0x00, 0x00, // e

			0x00, 0x00, 0x04, 0x7f, 0x75, 0x01, 0x00, 0x00, // f

			0x00, 0xbc, 0xb4, 0xa4, 0xa4, 0xfc, 0x00, 0x00, // g

			0x00, 0x7f, 0x74, 0x04, 0x04, 0x7c, 0x00, 0x00, // h

			0x00, 0x00, 0x00, 0x7d, 0x71, 0x00, 0x00, 0x00, // i

			0x00, 0x00, 0x80, 0xbd, 0xf1, 0x00, 0x00, 0x00, // j

			0x00, 0x7f, 0x70, 0x10, 0x1c, 0x70, 0x00, 0x00, // k

			0x00, 0x00, 0x00, 0x7f, 0x78, 0x00, 0x00, 0x00, // l

			0x00, 0x7c, 0x74, 0x04, 0x7c, 0x04, 0x7c, 0x00, // m

			0x00, 0x7c, 0x74, 0x04, 0x04, 0x7c, 0x00, 0x00, // n

			0x00, 0x7c, 0x74, 0x44, 0x44, 0x7c, 0x00, 0x00, // o

			0x00, 0xfc, 0x34, 0x24, 0x24, 0x3c, 0x00, 0x00, // p

			0x00, 0x3c, 0x34, 0x24, 0x24, 0xfc, 0x00, 0x00, // q

			0x00, 0x00, 0x7c, 0x74, 0x04, 0x04, 0x00, 0x00, // r

			0x00, 0x5c, 0x54, 0x54, 0x74, 0x74, 0x00, 0x00, // s

			0x00, 0x00, 0x04, 0x7f, 0x74, 0x00, 0x00, 0x00, // t

			0x00, 0x7c, 0x70, 0x40, 0x40, 0x7c, 0x00, 0x00, // u

			0x00, 0x1c, 0x7c, 0x40, 0x70, 0x1c, 0x00, 0x00, // v

			0x00, 0x7c, 0x70, 0x40, 0x7c, 0x40, 0x7c, 0x00, // w

			0x00, 0x6c, 0x70, 0x10, 0x10, 0x6c, 0x00, 0x00, // x

			0x00, 0xbc, 0xb0, 0xa0, 0xa0, 0xfc, 0x00, 0x00, // y

			0x00, 0x74, 0x74, 0x54, 0x54, 0x5c, 0x00, 0x00, // z

			0x00, 0x7f, 0x41, 0x41, 0x41, 0x79, 0x7f, 0x00, // 0

			0x00, 0x00, 0x00, 0x78, 0x7f, 0x00, 0x00, 0x00, // 1

			0x00, 0x7b, 0x79, 0x49, 0x49, 0x49, 0x4f, 0x00, // 2

			0x00, 0x63, 0x49, 0x49, 0x49, 0x7f, 0x78, 0x00, // 3

			0x00, 0x1f, 0x11, 0x11, 0x71, 0x7f, 0x10, 0x00, // 4

			0x00, 0x6f, 0x49, 0x49, 0x49, 0x79, 0x79, 0x00, // 5

			0x00, 0x7f, 0x49, 0x49, 0x49, 0x79, 0x7b, 0x00, // 6

			0x00, 0x01, 0x01, 0x01, 0x79, 0x7f, 0x00, 0x00, // 7

			0x00, 0x78, 0x4f, 0x49, 0x49, 0x7f, 0x78, 0x00, // 8

			0x00, 0x1f, 0x11, 0x11, 0x11, 0x71, 0x7f, 0x00, // 9

			0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, // -

			0x00, 0x00, 0x00, 0x6c, 0x6c, 0x00, 0x00, 0x00, // :

			0x00, 0x00, 0x00, 0x60, 0x60, 0x00, 0x00, 0x00, // .

			0x00, 0x00, 0x00, 0x60, 0xe0, 0x00, 0x00, 0x00, // ,

		}

	};

	// nothing to do?

	if( c == _glyph_cache_char )

		return;

	_glyph_cache_char = c;

	// find glyph data position

	int pos;

	if( c >= 'A' && c <= 'Z' )

		pos = c - 'A';

	else if( c >= 'a' && c <= 'z' )

		pos = c - 'a' + 26;

	else if( c >= '0' && c <= '9' )

		pos = c - '0' + 52;

	else if( c == '-' )

		pos = 62;

	else if( c == ':' )

		pos = 63;

	else if( c == '.' )

		pos = 64;

	else if( c == ',' )

		pos = 65;

	else

		pos = -1;

	// space? or copy glyph from progmem?

	if( pos == -1 )

		memset( _glyph_cache, 0, 8 );

	else

		memcpy_P( _glyph_cache, &( fonts[ _font ][ pos * 8 ] ), 8 );

}

// convert segment to display-space segment

int xform_segment( int segment )

{

	if( segment < TEXT_DISPLAY_SEGMENTS / 2 )

		return segment + TEXT_DISPLAY_SEGMENTS / 2;

	else if( segment >= NUM_SEGMENTS - TEXT_DISPLAY_SEGMENTS / 2 )

		return segment - ( NUM_SEGMENTS - TEXT_DISPLAY_SEGMENTS / 2 );

	else

		return - 1;

}

// draw a column of pixels from the current message

void render( int x )

{

	// handle negative x

	if( x < 0 ) {

		Display::leds_off();

		return;

	}

	// scale font

	x /= TEXT_SCALE;

	// make sure the correct glyph is cached

	int pos = x / 8;

	cache_glyph( ( pos >= 0 && pos < (signed)_message.length() )? _message[ pos ] : ' ' );

	// draw a column

	char col_data = _glyph_cache[ x % 8 ];

	for( int a = 0; a < 8; a++ )

		Display::led( 8 - a, ( col_data & ( 1 << a ) )? true : false );

}

PString &TextRenderer::get_pstring()

{

	// reset renderer

	_duration = 0;

	_last_millis = ::millis();

	_scroll = -TEXT_DISPLAY_SEGMENTS;

	return _message;

}

void TextRenderer::draw_reset()

{

	// how many milliseconds have elapsed since last frame?

	unsigned long millis = ::millis();

	if( millis > _last_millis )

		_duration = millis - _last_millis;

	_last_millis = millis;

	// move on scroll pos

	_scroll += ( _duration * TEXT_SCROLL_SPEED / 1000 );

	if( _scroll > (signed long)_message.length() * 8 * TEXT_SCALE )

		_scroll -= (signed long)_message.length() * 8 * TEXT_SCALE + TEXT_DISPLAY_SEGMENTS;

}

void TextRenderer::draw_scroll( int segment )

{

	segment = xform_segment( segment );

	if( segment < 0 )

		Display::leds_off();

	else

		render( (long)segment + _scroll );

}