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38fa2720cf4cb7af59bef60ced5213ac3a8e0d7f
lcdproc/server/render.c
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marschap 1a5b38f028 Doxygen-ize file headers
2008-11-30 22:31:20 +00:00

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/** \file server/render.c
* Draws screens on the LCD.
*
* This needs to be greatly expanded and redone for greater flexibility.
* For example, it should support multiple screen sizes, more flexible
* widgets, and multiple simultaneous screens.
*
* This will probably take a while to do. :(
*
* THIS FILE IS MESSY! Anyone care to rewrite it nicely? Please?? :)
*
* NOTE: (from David Douthitt) Multiple screen sizes? Multiple simultaneous
* screens? Horrors of horrors... next thing you know it'll be making coffee...
* Better believe it'll take a while to do...
*/
/* This file is part of LCDd, the lcdproc server.
*
* This file is released under the GNU General Public License.
* Refer to the COPYING file distributed with this package.
*
* Copyright (c) 1999, William Ferrell, Scott Scriven
* 2001, Joris Robijn
* 2007, Peter Marschall
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "shared/report.h"
#include "shared/LL.h"
#include "drivers.h"
#include "screen.h"
#include "screenlist.h"
#include "widget.h"
#include "render.h"
#define BUFSIZE 1024 /* larger than display width => large enough */
int heartbeat = HEARTBEAT_OPEN;
static int heartbeat_fallback = HEARTBEAT_ON; /* If no heartbeat setting has been set at all */
int backlight = BACKLIGHT_OPEN;
static int backlight_fallback = BACKLIGHT_ON; /* If no backlight setting has been set at all */
int titlespeed = 1;
int output_state = 0;
char *server_msg_text;
int server_msg_expire = 0;
static int render_frame(LinkedList *list, int left, int top, int right, int bottom, int fwid, int fhgt, char fscroll, int fspeed, long timer);
static int render_string(Widget *w, int left, int top, int right, int bottom, int fy);
static int render_hbar(Widget *w, int left, int top, int right, int bottom, int fy);
static int render_vbar(Widget *w, int left, int top, int right, int bottom);
static int render_title(Widget *w, int left, int top, int right, int bottom, long timer);
static int render_scroller(Widget *w, int left, int top, int right, int bottom, long timer);
static int render_num(Widget *w, int left, int top, int right, int bottom);
int
render_screen(Screen *s, long timer)
{
int tmp_state = 0;
debug(RPT_DEBUG, "%s(screen=[%.40s], timer=%ld) ==== START RENDERING ====", __FUNCTION__, s->id, timer);
if (s == NULL)
return -1;
/* Clear the LCD screen... */
drivers_clear();
/* FIXME drivers_backlight --
*
* If the screen's backlight isn't set (default) then we
* inherit the backlight state from the parent client. This allows
* the client to override it's childrens settings.
* The server can also override the clients and screens settings.
*/
if (backlight != BACKLIGHT_OPEN) {
tmp_state = backlight;
}
else if ((s->client != NULL) && (s->client->backlight != BACKLIGHT_OPEN)) {
tmp_state = s->client->backlight;
}
else if (s->backlight != BACKLIGHT_OPEN) {
tmp_state = s->backlight;
}
else {
tmp_state = backlight_fallback;
}
/* Set up backlight to the correct state... */
/* NOTE: dirty stripping of other options... */
/* Backlight flash: check timer and flip backlight as appropriate */
if (tmp_state & BACKLIGHT_FLASH) {
drivers_backlight(
(
(tmp_state & BACKLIGHT_ON)
^ ((timer & 7) == 7)
) ? BACKLIGHT_ON : BACKLIGHT_OFF);
}
/* Backlight blink: check timer and flip backlight as appropriate */
else if (tmp_state & BACKLIGHT_BLINK) {
drivers_backlight(
(
(tmp_state & BACKLIGHT_ON)
^ ((timer & 14) == 14)
) ? BACKLIGHT_ON : BACKLIGHT_OFF);
}
else {
/* Simple: Only send lowest bit then... */
drivers_backlight(tmp_state & BACKLIGHT_ON);
}
/* Output ports from LCD - outputs depend on the current screen */
drivers_output(output_state);
/* Draw a frame... */
render_frame(s->widgetlist, 0, 0,
display_props->width, display_props->height,
s->width, s->height, 'v', max(s->duration / s->height, 1), timer);
/* Set the cursor */
drivers_cursor(s->cursor_x, s->cursor_y, s->cursor);
if (heartbeat != HEARTBEAT_OPEN) {
tmp_state = heartbeat;
}
else if ((s->client != NULL) && (s->client->heartbeat != HEARTBEAT_OPEN)) {
tmp_state = s->client->heartbeat;
}
else if (s->heartbeat != HEARTBEAT_OPEN) {
tmp_state = s->heartbeat;
}
else {
tmp_state = heartbeat_fallback;
}
drivers_heartbeat(tmp_state);
/* If there is an server message that is not expired, display it */
if (server_msg_expire > 0) {
drivers_string(display_props->width - strlen(server_msg_text) + 1,
display_props->height, server_msg_text);
server_msg_expire--;
if (server_msg_expire == 0) {
free(server_msg_text);
}
}
/* flush display out, frame and all... */
drivers_flush();
debug(RPT_DEBUG, "==== END RENDERING ====");
return 0;
}
/* The following function is positively ghastly (as was mentioned above!) */
/* Best thing to do is to remove support for frames... but anyway... */
/* */
static int
render_frame(LinkedList *list,
int left, /* left edge of frame */
int top, /* top edge of frame */
int right, /* right edge of frame */
int bottom, /* bottom edge of frame */
int fwid, /* frame width? */
int fhgt, /* frame height? */
char fscroll, /* direction of scrolling */
int fspeed, /* speed of scrolling... */
long timer) /* current timer tick */
{
int fy = 0; /* Scrolling offset for the frame... */
debug(RPT_DEBUG, "%s(list=%p, left=%d, top=%d, "
"right=%d, bottom=%d, fwid=%d, fhgt=%d, "
"fscroll='%c', fspeed=%d, timer=%ld)",
__FUNCTION__, list, left, top, right, bottom,
fwid, fhgt, fscroll, fspeed, timer);
/* return on no data or illegal height */
if ((list == NULL) || (fhgt <= 0))
return -1;
if (fscroll == 'v') { /* vertical scrolling */
// only set offset !=0 when fspeed is != 0 and there is something to scroll
if ((fspeed != 0) && (fhgt > bottom - top)) {
int fy_max = fhgt - (bottom - top) + 1;
fy = (fspeed > 0)
? (timer / fspeed) % fy_max
: (-fspeed * timer) % fy_max;
fy = max(fy, 0); // safeguard against negative values
debug(RPT_DEBUG, "%s: fy=%d", __FUNCTION__, fy);
}
}
else if (fscroll == 'h') { /* horizontal scrolling */
/* TODO: Frames don't scroll horizontally yet! */
}
/* reset widget list */
LL_Rewind(list);
/* loop over all widgets */
do {
Widget *w = (Widget *) LL_Get(list);
if (w == NULL)
return -1;
/* TODO: Make this cleaner and more flexible! */
switch (w->type) {
case WID_STRING:
render_string(w, left, top - fy, right, bottom, fy);
break;
case WID_HBAR:
render_hbar(w, left, top - fy, right, bottom, fy);
break;
case WID_VBAR: /* FIXME: Vbars don't work in frames! */
render_vbar(w, left, top, right, bottom);
break;
case WID_ICON:
drivers_icon(w->x, w->y, w->length);
break;
case WID_TITLE: /* FIXME: Doesn't work quite right in frames... */
render_title(w, left, top, right, bottom, timer);
break;
case WID_SCROLLER: /* FIXME: doesn't work in frames... */
render_scroller(w, left, top, right, bottom, timer);
break;
case WID_FRAME:
{
/* FIXME: doesn't handle nested frames quite right!
* doesn't handle scrolling in nested frames at all...
*/
int new_left = left + w->left - 1;
int new_top = top + w->top - 1;
int new_right = min(left + w->right, right);
int new_bottom = min(top + w->bottom, bottom);
if ((new_left < right) && (new_top < bottom)) /* Render only if it's visible... */
render_frame(w->frame_screen->widgetlist, new_left, new_top,
new_right, new_bottom, w->width, w->height,
w->length, w->speed, timer);
}
break;
case WID_NUM: /* FIXME: doesn't work in frames... */
/* NOTE: y=10 means COLON (:) */
if ((w->x > 0) && (w->y >= 0) && (w->y <= 10)) {
drivers_num(w->x + left, w->y);
}
break;
case WID_NONE:
default:
break;
}
} while (LL_Next(list) == 0);
return 0;
}
static int
render_string(Widget *w, int left, int top, int right, int bottom, int fy)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d, fy=%d)",
__FUNCTION__, w, left, top, right, bottom, fy);
if ((w != NULL) && (w->text != NULL) &&
(w->x > 0) && (w->y > 0) && (w->y > fy) && (w->y <= bottom - top)) {
int length;
char str[BUFSIZE];
w->x = min(w->x, right - left);
length = min(right - left - w->x + 1, sizeof(str));
strncpy(str, w->text, length);
str[length] = '\0';
drivers_string(w->x + left, w->y + top, str);
}
return 0;
}
static int
render_hbar(Widget *w, int left, int top, int right, int bottom, int fy)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d, fy=%d)",
__FUNCTION__, w, left, top, right, bottom, fy);
if ((w != NULL) &&
(w->x > 0) && (w->y > 0) && (w->y > fy) && (w->y <= bottom - top)) {
if (w->length > 0) {
int full_len = display_props->width - w->x - left + 1;
int promille = 1000;
if ((w->length / display_props->cellwidth) < right - left - w->x + 1)
promille = (long) 1000 * w->length / (display_props->cellwidth * full_len);
drivers_hbar(w->x + left, w->y + top, full_len, promille, BAR_PATTERN_FILLED);
}
else if (w->length < 0) {
/* TODO: Rearrange stuff to get left-extending
* hbars to draw correctly...
* .. er, this'll require driver modifications,
* so I'll leave it out for now.
*/
}
}
return 0;
}
static int
render_vbar(Widget *w, int left, int top, int right, int bottom)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d)",
__FUNCTION__, w, left, top, right, bottom);
if ((w != NULL) && (w->x > 0) && (w->y > 0)) {
if (w->length > 0) {
int full_len = display_props->height;
int promille = (long) 1000 * w->length / (display_props->cellheight * full_len);
drivers_vbar(w->x + left, w->y + top, full_len, promille, BAR_PATTERN_FILLED);
}
else if (w->length < 0) {
/* TODO: Rearrange stuff to get down-extending
* vbars to draw correctly...
* .. er, this'll require driver modifications,
* so I'll leave it out for now.
*/
}
}
return 0;
}
static int
render_title(Widget *w, int left, int top, int right, int bottom, long timer)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d, timer=%ld)",
__FUNCTION__, w, left, top, right, bottom, timer);
int vis_width = right - left;
if ((w != NULL) && (w->text != NULL) && (vis_width >= 8)) {
char str[BUFSIZE];
int length = strlen(w->text);
int width = vis_width - 6;
int x;
/* calculate delay from titlespeed: <=0 -> 0, [1 - infty] -> [10 - 1] */
int delay = (titlespeed <= TITLESPEED_NO)
? TITLESPEED_NO
: max(TITLESPEED_MIN, TITLESPEED_MAX - titlespeed);
/* display leading fillers */
drivers_icon(w->x + left, w->y + top, ICON_BLOCK_FILLED);
drivers_icon(w->x + left + 1, w->y + top, ICON_BLOCK_FILLED);
length = min(length, sizeof(str));
if ((length <= width) || (delay == 0)) {
/* copy test starting from the beginning */
length = min(length, width);
strncpy(str, w->text, length);
str[length] = '\0';
/* set x value for trailing fillers */
x = length + 4;
}
else { /* Scroll the title, if it doesn't fit... */
int offset = timer;
int reverse;
/* if the delay is "too large" increase cycle length */
if ((delay != 0) && (delay < length / (length - width)))
offset /= delay;
/* reverse direction every length ticks */
reverse = (offset / length) & 1;
/* restrict offset to cycle length */
offset %= length;
offset = max(offset, 0);
/* if the delay is "low enough" slow down as requested */
if ((delay != 0) && (delay >= length / (length - width)))
offset /= delay;
/* restrict offset to the max. allowed offset: length - width */
offset = min(offset, length - width);
/* scroll backward by mirroring offset at max. offset */
if (reverse)
offset = (length - width) - offset;
/* copy test starting from offset */
length = min(width, sizeof(str));
strncpy(str, w->text + offset, length);
str[length] = '\0';
/* set x value for trailing fillers */
x = vis_width - 2;
}
/* display text */
drivers_string(w->x + 3 + left, w->y + top, str);
/* display trailing fillers */
for ( ; x < vis_width; x++) {
drivers_icon(w->x + x + left, w->y + top, ICON_BLOCK_FILLED);
}
}
return 0;
}
static int
render_scroller(Widget *w, int left, int top, int right, int bottom, long timer)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d, timer=%ld)",
__FUNCTION__, w, left, top, right, bottom, timer);
if ((w->text != NULL) && (w->right >= w->left)) {
char str[BUFSIZE];
int length;
int offset;
int screen_width;
/*debug(RPT_DEBUG, "%s: %s %d",__FUNCTION__,w->text,timer);*/
screen_width = abs(w->right - w->left + 1);
screen_width = min(screen_width, sizeof(str));
switch (w->length) { /* actually, direction... */
case 'm': // Marquee
length = strlen(w->text);
if (length <= screen_width) {
/* it fits within the box, just render it */
drivers_string(w->left, w->top, w->text);
}
else {
int necessaryTimeUnits = 0;
if (w->speed > 0) {
necessaryTimeUnits = length * w->speed;
offset = (timer % (length * w->speed)) / w->speed;
}
else if (w->speed < 0) {
necessaryTimeUnits = length / (w->speed * -1);
offset = (timer % (length / (w->speed * -1))) * w->speed * -1;
}
else {
offset = 0;
}
if (offset <= length) {
int room = screen_width - (length - offset);
strncpy(str, &w->text[offset], screen_width);
// if there's more room, restart at the beginning
if (room > 0) {
strncat(str, w->text, room);
}
str[screen_width] = '\0';
/*debug(RPT_DEBUG, "scroller %s : %d", str, length-offset);*/
}
else {
str[0] = '\0';
}
drivers_string(w->left, w->top, str);
}
break;
case 'h':
length = strlen(w->text) + 1;
if (length <= screen_width) {
/* it fits within the box, just render it */
drivers_string(w->left, w->top, w->text);
}
else {
int effLength = length - screen_width;
int necessaryTimeUnits = 0;
if (w->speed > 0) {
necessaryTimeUnits = effLength * w->speed;
if (((timer / (effLength * w->speed)) % 2) == 0) {
/* wiggle one way */
offset = (timer % (effLength * w->speed))
/ w->speed;
}
else {
/* wiggle the other */
offset = (((timer % (effLength * w->speed))
- (effLength * w->speed) + 1)
/ w->speed) * -1;
}
}
else if (w->speed < 0) {
necessaryTimeUnits = effLength / (w->speed * -1);
if (((timer / (effLength / (w->speed * -1))) % 2) == 0) {
offset = (timer % (effLength / (w->speed * -1)))
* w->speed * -1;
}
else {
offset = (((timer % (effLength / (w->speed * -1)))
* w->speed * -1)
- effLength + 1) * -1;
}
}
else {
offset = 0;
}
if (offset <= length) {
strncpy(str, &((w->text)[offset]), screen_width);
str[screen_width] = '\0';
/*debug(RPT_DEBUG, "scroller %s : %d", str, length-offset); */
}
else {
str[0] = '\0';
}
drivers_string(w->left, w->top, str);
}
break;
/* FIXME: Vert scrollers don't always seem to scroll */
/* back up after hitting the bottom. They jump back to */
/* the top instead... (nevermind?) */
case 'v':
length = strlen(w->text);
if (length <= screen_width) {
/* no scrolling required... */
drivers_string(w->left, w->top, w->text);
}
else {
int lines_required = (length / screen_width)
+ (length % screen_width ? 1 : 0);
int available_lines = (w->bottom - w->top + 1);
if (lines_required <= available_lines) {
/* easy... */
int i;
for (i = 0; i < lines_required; i++) {
strncpy(str, &((w->text)[i * screen_width]), screen_width);
str[screen_width] = '\0';
drivers_string(w->left, w->top + i, str);
}
}
else {
int necessaryTimeUnits = 0;
int effLines = lines_required - available_lines + 1;
int begin = 0;
int i = 0;
/*debug(RPT_DEBUG, "length: %d sw: %d lines req: %d avail lines: %d effLines: %d ",length,screen_width,lines_required,available_lines,effLines);*/
if (w->speed > 0) {
necessaryTimeUnits = effLines * w->speed;
if (((timer / (effLines * w->speed)) % 2) == 0) {
/*debug(RPT_DEBUG, "up ");*/
begin = (timer % (effLines * w->speed))
/ w->speed;
}
else {
/*debug(RPT_DEBUG, "down ");*/
begin = (((timer % (effLines * w->speed))
- (effLines * w->speed) + 1) / w->speed)
* -1;
}
}
else if (w->speed < 0) {
necessaryTimeUnits = effLines / (w->speed * -1);
if (((timer / (effLines / (w->speed * -1))) % 2) == 0) {
begin = (timer % (effLines / (w->speed * -1)))
* w->speed * -1;
}
else {
begin = (((timer % (effLines / (w->speed * -1)))
* w->speed * -1) - effLines + 1)
* -1;
}
}
else {
begin = 0;
}
/*debug(RPT_DEBUG, "rendering begin: %d timer: %d effLines: %d",begin,timer,effLines); */
for (i = begin; i < begin + available_lines; i++) {
strncpy(str, &((w->text)[i * (screen_width)]), screen_width);
str[screen_width] = '\0';
/*debug(RPT_DEBUG, "rendering: '%s' of %s", */
/*str,w->text); */
drivers_string(w->left, w->top + (i - begin), str);
}
}
}
break;
}
}
return 0;
}
static int render_num(Widget *w, int left, int top, int right, int bottom)
{
debug(RPT_DEBUG, "%s(w=%p, left=%d, top=%d, right=%d, bottom=%d)",
__FUNCTION__, w, left, top, right, bottom);
/* NOTE: y=10 means COLON (:) */
if ((w != NULL) && (w->x > 0) && (w->y >= 0) && (w->y <= 10)) {
drivers_num(w->x + left, w->y);
}
return 0;
}
int
server_msg(const char *text, int expire)
{
debug(RPT_DEBUG, "%s(text=\"%.40s\", expire=%d)", __FUNCTION__, text, expire);
if (strlen(text) > 15 || expire <= 0) {
return -1;
}
/* Still a message active ? */
if (server_msg_expire > 0) {
free(server_msg_text);
}
/* Store new message */
server_msg_text = malloc(strlen(text) + 3);
strcpy(server_msg_text, "| ");
strcat(server_msg_text, text);
server_msg_expire = expire;
return 0;
}
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