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/*
* text.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.h"
#include "text_renderer.h"
#include "config.h"
#include "Arduino.h"
#include <avr/pgmspace.h>
// the buffer for the message
char Text::_messages[ NUM_MESSAGE_BUFFERS ][ MESSAGE_BUFFER_LEN ];
// message buffer lengths
static int _message_lens[ NUM_MESSAGE_BUFFERS ];
// the mode that each message represents
static char _message_modes[ NUM_MESSAGE_BUFFERS ];
// mode-specific message parameters
static signed long _message_pos[ NUM_MESSAGE_BUFFERS ];
// text scaling factors
static char _message_scale[ NUM_MESSAGE_BUFFERS ];
// time last frame
static unsigned long _last_millis;
// duration last frame (in case we can't calculate it this frame!)
static unsigned long _duration;
// recalculate message params, based on _duration
static bool _do_draw_reset;
#define MASK_MODE_SIZE 0x07
#define MASK_MODE_POS 0x40
void reset_message_pos( int message_num )
{
if( _message_modes[ message_num ] & Text::MODE_HSCROLL )
{
switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
{
case Text::MODE_ONEQUARTER:
_message_pos[ message_num ] = -NUM_SEGMENTS / 4; break;
case Text::MODE_ONETHIRD:
_message_pos[ message_num ] = -NUM_SEGMENTS / 3; break;
case Text::MODE_HALF:
_message_pos[ message_num ] = -NUM_SEGMENTS / 2; break;
case Text::MODE_TWOTHIRDS:
_message_pos[ message_num ] = -NUM_SEGMENTS * 2 / 3; break;
case Text::MODE_THREEQUARTERS:
_message_pos[ message_num ] = -NUM_SEGMENTS * 3 / 4; break;
case Text::MODE_ALL:
_message_pos[ message_num ] = -NUM_SEGMENTS; break;
}
}
else
{
switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
{
case Text::MODE_ONEQUARTER:
_message_pos[ message_num ] = NUM_SEGMENTS / 4; break;
case Text::MODE_ONETHIRD:
_message_pos[ message_num ] = NUM_SEGMENTS / 3; break;
case Text::MODE_HALF:
_message_pos[ message_num ] = NUM_SEGMENTS / 2; break;
case Text::MODE_TWOTHIRDS:
_message_pos[ message_num ] = NUM_SEGMENTS * 2 / 3; break;
case Text::MODE_THREEQUARTERS:
_message_pos[ message_num ] = NUM_SEGMENTS * 3 / 4; break;
case Text::MODE_ALL:
_message_pos[ message_num ] = NUM_SEGMENTS; break;
}
_message_pos[ message_num ] = -( _message_pos[ message_num ] -
TextRenderer::get_width( _message_lens[ message_num ],
_message_scale[ message_num ] ) ) / 2;
}
}
void Text::reset()
{
// reset renderer
_duration = 0;
_last_millis = ::millis();
// clear all message modes (disable messages)
for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
_message_modes[ a ] = 0;
// reset the text renderer's output buffer
TextRenderer::reset_buffer();
}
void Text::set_up_message( int message_num, char mode, char scale )
{
_message_modes[ message_num ] = mode;
_message_scale[ message_num ] = scale;
// horizontal scrolling messages need their position reset at start of mode
if( _message_modes[ message_num ] & MODE_HSCROLL )
reset_message_pos( message_num );
}
void Text::set_message_text( int message_num, PString &pstring )
{
// update message
_message_lens[ message_num ] = pstring.length();
// non-horizontal scrolling modes need their position reset whenever the
// text changes
if( !( _message_modes[ message_num ] & MODE_HSCROLL ) )
reset_message_pos( message_num );
}
void Text::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;
// we'll need to recalculate params for the frame, but we want to do it when
// we're not in the middle of a text display (to avoid tearing).
_do_draw_reset = true;
}
static void draw_message( int message_num, int segment )
{
TextRenderer::buffer_in_use();
// calculate the width
int width;
switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
{
case Text::MODE_ONEQUARTER:
width = NUM_SEGMENTS / 4;
break;
case Text::MODE_ONETHIRD:
width = NUM_SEGMENTS / 3;
break;
case Text::MODE_HALF:
width = NUM_SEGMENTS / 2;
break;
case Text::MODE_TWOTHIRDS:
width = NUM_SEGMENTS * 2 / 3;
break;
case Text::MODE_THREEQUARTERS:
width = NUM_SEGMENTS * 3 / 4;
break;
case Text::MODE_ALL:
width = NUM_SEGMENTS;
break;
}
// convert segment to display-space
switch( _message_modes[ message_num ] & MASK_MODE_POS )
{
case Text::MODE_TOP:
if( segment < width / 2 )
segment += width / 2;
else if( segment >= NUM_SEGMENTS - width / 2 )
segment -= ( NUM_SEGMENTS - width / 2 );
else
return;
break;
case Text::MODE_BOTTOM:
if( segment > ( NUM_SEGMENTS - width ) / 2 &&
segment < ( NUM_SEGMENTS - width ) / 2 + width )
{
segment = width - ( segment - ( NUM_SEGMENTS - width ) / 2 );
}
else
return;
break;
}
// render
TextRenderer::render(
Text::_messages[ message_num ], _message_lens[ message_num ],
(long)segment + _message_pos[ message_num ],
( _message_modes[ message_num ] & MASK_MODE_POS ) == Text::MODE_BOTTOM,
0, _message_scale[ message_num ] );
}
void Text::draw( int segment )
{
// perform a mid-frame reset, as necessary
if( _do_draw_reset && segment == NUM_SEGMENTS / 2 ) {
_do_draw_reset = false;
// go through the messages looking for an active one
for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
if( _message_modes[ a ] & MASK_MODE_SIZE )
{
// add to horizontal scroll position
if( _message_modes[ a ] & Text::MODE_HSCROLL ) {
_message_pos[ a ] +=
_duration * TEXT_SCROLL_SPEED / 1000;
long excess = _message_pos[ a ] -
TextRenderer::get_width( _message_lens[ a ],
_message_scale[ a ] );
if( excess >= 0 ) {
reset_message_pos( a );
_message_pos[ a ] += excess;
}
}
}
}
// draw any active messages
for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
if( _message_modes[ a ] & MASK_MODE_SIZE )
draw_message( a, segment );
}
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