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rockbox/apps/viewer.c
Björn Stenberg f97594443d ON now acts as page scroll modifier. OFF/STOP exits. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2474 a1c6a512-1295-4272-9138-f99709370657
2002-10-02 11:37:37 +00:00

435 lines
10 KiB
C
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/***************************************************************************
*
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 Gilles Roux
*
* 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include "file.h"
#include "lcd.h"
#include "button.h"
#include "kernel.h"
#include "font.h"
#include "settings.h"
#include "icons.h"
#include "screens.h"
#define BUFFER_SIZE 1024
#define OUTSIDE_BUFFER -10
#define OUTSIDE_FILE -11
static int fd;
static int file_size;
static char buffer[BUFFER_SIZE+1];
static int buffer_pos; /* Position of the buffer in the file */
static char display_lines; /* number of lines on the display */
static char display_columns; /* number of columns on the display */
static int begin_line; /* Index of the first line displayed on the lcd */
static int end_line; /* Index of the last line displayed on the lcd */
static int begin_line_pos; /* Position of the first_line in the bufffer */
static int end_line_pos; /* Position of the last_line in the buffer */
/*
* Known issue: The caching algorithm will fail (display incoherent data) if
* the total space of the lines that are displayed on the screen exceeds the
* buffer size (only happens with very long lines).
*/
static void display_line_count(void)
{
#ifdef HAVE_LCD_BITMAP
int w,h;
lcd_getstringsize("M", &w, &h);
display_lines = LCD_HEIGHT / h;
display_columns = LCD_WIDTH / w;
#else
display_lines = 2;
display_columns = 11;
#endif
}
static int find_next_line(int pos)
{
int i;
if (pos==OUTSIDE_BUFFER || pos==OUTSIDE_FILE)
return pos;
i = pos;
if (buffer_pos+i>=file_size) {
return OUTSIDE_FILE;
}
while (1) {
i++;
if (buffer_pos+i==file_size) {
return i;
}
if (i>=BUFFER_SIZE) {
return OUTSIDE_BUFFER;
}
if (buffer[i]==0) {
return i;
}
}
}
static int find_prev_line(int pos)
{
int i;
if (pos==OUTSIDE_BUFFER || pos==OUTSIDE_FILE)
return pos;
i = pos;
if (buffer_pos+i<0) {
return OUTSIDE_FILE;
}
while (1) {
i--;
if (buffer_pos+i<0) {
return i;
}
if (i<0) {
return OUTSIDE_BUFFER;
}
if (buffer[i]==0) {
return i;
}
}
}
static void viewer_draw(int col)
{
int i, j;
char* str;
int line_pos;
lcd_clear_display();
line_pos = begin_line_pos;
for (i=0; i <= end_line - begin_line; i++) {
if (line_pos == OUTSIDE_BUFFER ||
line_pos == OUTSIDE_FILE)
break;
str = buffer + line_pos + 1;
for (j=0; j<col && *str!=0; ++j)
str++;
lcd_puts(0, i, str);
line_pos = find_next_line(line_pos);
}
lcd_update();
}
static void fill_buffer(int pos)
{
int i;
int numread;
if (pos>=file_size-BUFFER_SIZE)
pos = file_size-BUFFER_SIZE;
if (pos<0)
pos = 0;
lseek(fd, pos, SEEK_SET);
numread = read(fd, buffer, BUFFER_SIZE);
begin_line_pos -= pos - buffer_pos;
end_line_pos -= pos - buffer_pos;
buffer_pos = pos;
buffer[numread] = 0;
for(i=0;i<numread;i++) {
switch(buffer[i]) {
case '\r':
buffer[i] = ' ';
break;
case '\n':
buffer[i] = 0;
break;
default:
break;
}
}
}
static bool viewer_init(char* file)
{
int i;
int ret;
fd = open(file, O_RDONLY);
if (fd==-1)
return false;
file_size = lseek(fd, 0, SEEK_END);
buffer_pos = 0;
begin_line = 0;
begin_line_pos = -1;
end_line = -1;
end_line_pos = -1;
fill_buffer(0);
display_line_count();
for (i=0; i<display_lines; ++i) {
ret = find_next_line(end_line_pos);
if (ret!=OUTSIDE_FILE && ret!=OUTSIDE_BUFFER) {
end_line_pos = ret;
end_line++;
}
}
return true;
}
static void viewer_exit(void)
{
close(fd);
}
static void viewer_scroll_down(void)
{
int ret;
ret = find_next_line(end_line_pos);
switch ( ret ) {
case OUTSIDE_BUFFER:
begin_line_pos = find_next_line(begin_line_pos);
fill_buffer(begin_line_pos+buffer_pos);
end_line_pos = find_next_line(end_line_pos);
break;
case OUTSIDE_FILE:
return;
default:
begin_line_pos = find_next_line(begin_line_pos);
end_line_pos = ret;
break;
}
begin_line++;
end_line++;
}
static void viewer_scroll_up(void)
{
int ret;
ret = find_prev_line(begin_line_pos);
switch ( ret ) {
case OUTSIDE_BUFFER:
end_line_pos = find_prev_line(end_line_pos);
fill_buffer(buffer_pos+end_line_pos-BUFFER_SIZE);
begin_line_pos = find_prev_line(begin_line_pos);
break;
case OUTSIDE_FILE:
return;
default:
end_line_pos = find_prev_line(end_line_pos);
begin_line_pos = ret;
break;
}
begin_line--;
end_line--;
}
static int pagescroll(int col)
{
bool exit = false;
int i;
while (!exit) {
switch (button_get(true)) {
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_ON | BUTTON_UP:
case BUTTON_ON | BUTTON_UP | BUTTON_REPEAT:
#else
case BUTTON_ON | BUTTON_LEFT:
case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
#endif
for (i=0; i<display_lines; i++)
viewer_scroll_up();
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_ON | BUTTON_DOWN:
case BUTTON_ON | BUTTON_DOWN | BUTTON_REPEAT:
#else
case BUTTON_ON | BUTTON_RIGHT:
case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
for (i=0; i<display_lines; i++)
viewer_scroll_down();
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_ON | BUTTON_LEFT:
case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
#else
case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT:
case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT | BUTTON_REPEAT:
#endif
col -= display_columns;
if (col < 0)
col = 0;
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_ON | BUTTON_RIGHT:
case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
#else
case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT:
case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
col += display_columns;
break;
case BUTTON_ON | BUTTON_REL:
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_ON | BUTTON_DOWN | BUTTON_REL:
case BUTTON_ON | BUTTON_UP | BUTTON_REL:
#else
case BUTTON_ON | BUTTON_RIGHT | BUTTON_REL:
case BUTTON_ON | BUTTON_LEFT | BUTTON_REL:
case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT | BUTTON_REL:
case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT | BUTTON_REL:
#endif
exit = true;
break;
}
if ( !exit )
viewer_draw(col);
}
return col;
}
bool viewer_run(char* file)
{
bool exit=false;
int button;
int col = 0;
int ok;
int oldmask;
#ifdef HAVE_LCD_BITMAP
/* no margins */
lcd_setmargins(0, 0);
#endif
oldmask = button_set_release(~0);
ok = viewer_init(file);
if (!ok) {
lcd_clear_display();
lcd_puts(0, 0, "Error");
lcd_update();
sleep(HZ);
viewer_exit();
return false;
}
viewer_draw(col);
while (!exit) {
button = button_get(true);
switch ( button ) {
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_F1:
case BUTTON_OFF:
#else
case BUTTON_STOP:
#endif
viewer_exit();
exit = true;
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_UP:
case BUTTON_UP | BUTTON_REPEAT:
#else
case BUTTON_LEFT:
case BUTTON_LEFT | BUTTON_REPEAT:
#endif
viewer_scroll_up();
viewer_draw(col);
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_DOWN:
case BUTTON_DOWN | BUTTON_REPEAT:
#else
case BUTTON_RIGHT:
case BUTTON_RIGHT | BUTTON_REPEAT:
#endif
viewer_scroll_down();
viewer_draw(col);
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_LEFT:
case BUTTON_LEFT | BUTTON_REPEAT:
#else
case BUTTON_MENU | BUTTON_LEFT:
case BUTTON_MENU | BUTTON_LEFT | BUTTON_REPEAT:
#endif
col--;
if (col < 0)
col = 0;
viewer_draw(col);
break;
#ifdef HAVE_RECORDER_KEYPAD
case BUTTON_RIGHT:
case BUTTON_RIGHT | BUTTON_REPEAT:
#else
case BUTTON_MENU | BUTTON_RIGHT:
case BUTTON_MENU | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
col++;
viewer_draw(col);
break;
case BUTTON_ON:
#ifdef HAVE_PLAYER_KEYPAD
case BUTTON_ON | BUTTON_MENU:
#endif
col = pagescroll(col);
break;
case SYS_USB_CONNECTED:
usb_screen();
#ifdef HAVE_LCD_CHARCELLS
lcd_icon(ICON_PARAM, false);
#endif
viewer_exit();
return true;
}
}
button_set_release(oldmask);
return false;
}
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