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-rw-r--r--drv_generic_text.c612
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+/* $Id: drv_generic_text.c,v 1.1 2004/01/20 05:36:59 reinelt Exp $
+ *
+ * generic driver helper for text-based displays
+ *
+ * Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at>
+ * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux 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, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: drv_generic_text.c,v $
+ * Revision 1.1 2004/01/20 05:36:59 reinelt
+ * moved text-display-specific stuff to drv_generic_text
+ * moved all the bar stuff from drv_generic_bar to generic_text
+ *
+ */
+
+/*
+ *
+ * exported fuctions:
+ *
+ * Fixme: document me!
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+
+#include "debug.h"
+#include "cfg.h"
+#include "plugin.h"
+#include "lock.h"
+#include "widget.h"
+#include "widget_text.h"
+#include "widget_bar.h"
+#include "drv.h"
+#include "drv_generic.h"
+#include "drv_generic_text.h"
+
+
+typedef struct {
+ int val1;
+ int val2;
+ DIRECTION dir;
+ int segment;
+} BAR;
+
+typedef struct {
+ int val1;
+ int val2;
+ DIRECTION dir;
+ int used;
+ int ascii;
+} SEGMENT;
+
+
+static char *Driver;
+
+int DROWS, DCOLS; // display size
+int LROWS, LCOLS; // layout size
+int XRES, YRES; // pixels of one char cell
+int CHARS; // number of user-defineable characters
+
+char *LayoutFB = NULL;
+char *DisplayFB = NULL;
+static BAR *Bar = NULL;
+
+static int nSegment=0;
+static int fSegment=0;
+static SEGMENT Segment[128];
+
+// Fixme: get rid of me!
+static int RES;
+
+
+// ****************************************
+// *** generic Framebuffer stuff ***
+// ****************************************
+
+void drv_generic_text_resizeFB (int rows, int cols)
+{
+ char *newFB;
+ int row, col;
+
+ // Fixme: resize Bar FB too!!!!
+
+
+ // Layout FB is large enough
+ if (rows<=LROWS && cols<=LCOLS)
+ return;
+
+ // allocate new Layout FB
+ newFB=malloc(cols*rows*sizeof(char));
+ memset (newFB, ' ', rows*cols*sizeof(char));
+
+ // transfer contents
+ if (LayoutFB!=NULL) {
+ for (row=0; row<LROWS; row++) {
+ for (col=0; col<LCOLS; col++) {
+ newFB[row*cols+col]=LayoutFB[row*LCOLS+col];
+ }
+ }
+ free (LayoutFB);
+ }
+
+ LayoutFB = newFB;
+ LCOLS = cols;
+ LROWS = rows;
+}
+
+
+
+int drv_generic_text_draw_text (WIDGET *W, int goto_len,
+ void (*drv_goto)(int row, int col),
+ void (*drv_write)(char *buffer, int len))
+{
+ WIDGET_TEXT *T=W->data;
+ char *txt, *fb1, *fb2;
+ int row, col, len, end;
+
+ row=W->row;
+ col=W->col;
+ txt=T->buffer;
+ len=strlen(txt);
+ end=col+len;
+
+ // maybe grow layout framebuffer
+ drv_generic_text_resizeFB (row, col+len-1);
+
+ fb1 = LayoutFB + row*LCOLS;
+ fb2 = DisplayFB + row*DCOLS;
+
+ // transfer new text into layout buffer
+ memcpy (fb1+col, txt, len);
+
+ for (; col<=end; col++) {
+ int pos1, pos2, equal;
+ if (fb1[col]==fb2[col]) continue;
+ drv_goto (row, col);
+ for (pos1=col, pos2=pos1, col++, equal=0; col<=end; col++) {
+ if (fb1[col]==fb2[col]) {
+ // If we find just one equal byte, we don't break, because this
+ // would require a goto, which takes several bytes, too.
+ if (++equal>goto_len) break;
+ } else {
+ pos2=col;
+ equal=0;
+ }
+ }
+ memcpy (fb2+pos1, fb1+pos1, pos2-pos1+1);
+ drv_write (fb2+pos1, pos2-pos1+1);
+ }
+
+ return 0;
+}
+
+
+// ****************************************
+// *** generic bar handling ***
+// ****************************************
+
+static void drv_generic_text_bar_clear(void)
+{
+ int i;
+
+ for (i=0; i<LROWS*LCOLS; i++) {
+ Bar[i].val1 = -1;
+ Bar[i].val2 = -1;
+ Bar[i].dir = 0;
+ Bar[i].segment = -1;
+ }
+
+ for (i=0; i<nSegment;i++) {
+ Segment[i].used = 0;
+ }
+}
+
+
+static void drv_generic_text_bar_create_bar (int row, int col, DIRECTION dir, int len, int val1, int val2)
+{
+ int rev=0;
+
+ switch (dir) {
+ case DIR_WEST:
+ val1 = len-val1;
+ val2 = len-val2;
+ rev = 1;
+
+ case DIR_EAST:
+ while (len > 0 && col < LCOLS) {
+ Bar[row*LCOLS+col].dir=dir;
+ Bar[row*LCOLS+col].segment=-1;
+ if (val1 >= XRES) {
+ Bar[row*LCOLS+col].val1 = rev?0:XRES;
+ val1 -= XRES;
+ } else {
+ Bar[row*LCOLS+col].val1 = rev?XRES-val1:val1;
+ val1 = 0;
+ }
+ if (val2 >= XRES) {
+ Bar[row*LCOLS+col].val2 = rev?0:XRES;
+ val2 -= XRES;
+ } else {
+ Bar[row*LCOLS+col].val2 = rev?XRES-val2:val2;
+ val2 = 0;
+ }
+ len--;
+ col++;
+ }
+ break;
+
+ case DIR_SOUTH:
+ val1 = len-val1;
+ val2 = len-val2;
+ rev = 1;
+
+ case DIR_NORTH:
+ while (len > 0 && row < LROWS) {
+ Bar[row*LCOLS+col].dir=dir;
+ Bar[row*LCOLS+col].segment=-1;
+ if (val1 >= YRES) {
+ Bar[row*LCOLS+col].val1 = rev?0:YRES;
+ val1 -= YRES;
+ } else {
+ Bar[row*LCOLS+col].val1 = rev?YRES-val1:val1;
+ val1 = 0;
+ }
+ if (val2 >= YRES) {
+ Bar[row*LCOLS+col].val2 = rev?0:YRES;
+ val2 -= YRES;
+ } else {
+ Bar[row*LCOLS+col].val2 = rev?YRES-val2:val2;
+ val2 = 0;
+ }
+ len--;
+ row++;
+ }
+ break;
+
+ }
+}
+
+
+static void drv_generic_text_bar_create_segments (void)
+{
+ int i, j, n;
+ int res, l1, l2;
+
+ /* find first unused segment */
+ for (i=fSegment; i<nSegment && Segment[i].used; i++);
+
+ /* pack unused segments */
+ for (j=i+1; j<nSegment; j++) {
+ if (Segment[j].used)
+ Segment[i++]=Segment[j];
+ }
+ nSegment=i;
+
+ /* create needed segments */
+ for (n=0; n<LROWS*LCOLS; n++) {
+ if (Bar[n].dir==0) continue;
+ res=Bar[n].dir & (DIR_EAST|DIR_WEST) ? XRES:YRES;
+ for (i=0; i<nSegment; i++) {
+ if (Segment[i].dir & Bar[n].dir) {
+ l1 = Segment[i].val1; if (l1>RES) l1=RES;
+ l2 = Segment[i].val2; if (l2>RES) l2=RES;
+ if (l1 == Bar[n].val1 && l2 == Bar[n].val2) break;
+ }
+ }
+ if (i==nSegment) {
+ nSegment++;
+ Segment[i].val1=Bar[n].val1;
+ Segment[i].val2=Bar[n].val2;
+ Segment[i].dir=Bar[n].dir;
+ Segment[i].used=0;
+ Segment[i].ascii=-1;
+ }
+ Bar[n].segment=i;
+ }
+}
+
+
+static int drv_generic_text_bar_segment_error (int i, int j)
+{
+ int res;
+ int i1, i2, j1, j2;
+
+ if (i==j) return 65535;
+ if (!(Segment[i].dir & Segment[j].dir)) return 65535;
+
+ res = Segment[i].dir&(DIR_EAST|DIR_WEST) ? XRES:YRES;
+
+ i1=Segment[i].val1; if (i1>res) i1=res;
+ i2=Segment[i].val2; if (i2>res) i2=res;
+ j1=Segment[j].val1; if (j1>res) j1=res;
+ j2=Segment[j].val2; if (j2>res) j2=res;
+
+ if (i1==0 && j1!=0) return 65535;
+ if (i2==0 && j2!=0) return 65535;
+ if (i1==res && j1<res) return 65535;
+ if (i2==res && j2<res) return 65535;
+ if (i1==1 && j1!=1 && i2 > 0) return 65535;
+ if (i2==1 && j2!=1 && j1 > 0) return 65535;
+ if (i1==i2 && j1!=j2) return 65535;
+
+ return (i1-j1)*(i1-j1)+(i2-j2)*(i2-j2);
+}
+
+
+static void drv_generic_text_bar_pack_segments (void)
+{
+ int i, j, n, min;
+ int pack_i, pack_j;
+ int pass1=1;
+ int error[nSegment][nSegment];
+
+ if (nSegment<=fSegment+CHARS) {
+ return;
+ }
+
+ for (i=0; i<nSegment; i++) {
+ for (j=0; j<nSegment; j++) {
+ error[i][j]=drv_generic_text_bar_segment_error(i,j);
+ }
+ }
+
+ while (nSegment>fSegment+CHARS) {
+
+ min=65535;
+ pack_i=-1;
+ pack_j=-1;
+ for (i=fSegment; i<nSegment; i++) {
+ if (pass1 && Segment[i].used) continue;
+ for (j=0; j<nSegment; j++) {
+ if (error[i][j]<min) {
+ min=error[i][j];
+ pack_i=i;
+ pack_j=j;
+ }
+ }
+ }
+ if (pack_i==-1) {
+ if (pass1) {
+ pass1=0;
+ continue;
+ } else {
+ error ("unable to compact bar characters");
+ nSegment=CHARS;
+ break;
+ }
+ }
+
+#if 0
+ debug ("pack_segment: n=%d i=%d j=%d min=%d", nSegment, pack_i, pack_j, min);
+ debug ("Pack_segment: i1=%d i2=%d j1=%d j2=%d\n",
+ Segment[pack_i].val1, Segment[pack_i].val2,
+ Segment[pack_j].val1, Segment[pack_j].val2);
+#endif
+
+ nSegment--;
+ Segment[pack_i]=Segment[nSegment];
+
+ for (i=0; i<nSegment; i++) {
+ error[pack_i][i]=error[nSegment][i];
+ error[i][pack_i]=error[i][nSegment];
+ }
+
+ for (n=0; n<LROWS*LCOLS; n++) {
+ if (Bar[n].segment==pack_i) Bar[n].segment=pack_j;
+ if (Bar[n].segment==nSegment) Bar[n].segment=pack_i;
+ }
+ }
+}
+
+
+static void drv_generic_text_bar_define_chars (void(*defchar)(int ascii, char *matrix))
+{
+ int c, i, j;
+ char buffer[8];
+
+ for (i=fSegment; i<nSegment; i++) {
+ if (Segment[i].used) continue;
+ if (Segment[i].ascii!=-1) continue;
+ for (c=0; c<CHARS; c++) {
+ for (j=fSegment; j<nSegment; j++) {
+ if (Segment[j].ascii==c) break;
+ }
+ if (j==nSegment) break;
+ }
+ Segment[i].ascii=c;
+ switch (Segment[i].dir) {
+ case DIR_WEST:
+ for (j=0; j<4; j++) {
+ buffer[j ]=(1<<Segment[i].val1)-1;
+ buffer[j+4]=(1<<Segment[i].val2)-1;
+ }
+ break;
+ case DIR_EAST:
+ for (j=0; j<4; j++) {
+ buffer[j ]=255<<(XRES-Segment[i].val1);
+ buffer[j+4]=255<<(XRES-Segment[i].val2);
+ }
+ break;
+ case DIR_NORTH:
+ for (j=0; j<Segment[i].val1; j++) {
+ buffer[7-j]=(1<<XRES)-1;
+ }
+ for (; j<YRES; j++) {
+ buffer[7-j]=0;
+ }
+ break;
+ case DIR_SOUTH:
+ for (j=0; j<Segment[i].val1; j++) {
+ buffer[j]=(1<<XRES)-1;
+ }
+ for (; j<YRES; j++) {
+ buffer[j]=0;
+ }
+ break;
+ }
+ defchar(c, buffer);
+ }
+}
+
+
+int drv_generic_text_draw_bar (WIDGET *W, int goto_len,
+ void (*drv_defchar)(int ascii, char *buffer),
+ void (*drv_goto)(int row, int col),
+ void (*drv_write)(char *buffer, int len))
+{
+ WIDGET_BAR *B = W->data;
+ int row, col, len, max, val1, val2;
+ int c, n, s;
+ DIRECTION dir;
+
+ row = W->row;
+ col = W->col;
+ dir = B->direction;
+ len = B->length;
+
+ // maybe grow layout framebuffer
+ // bars *always* grow heading North or East!
+ if (dir==DIR_EAST || dir==DIR_WEST) {
+ drv_generic_text_resizeFB (row, col+len-1);
+ RES = XRES;
+ } else {
+ drv_generic_text_resizeFB (row, col);
+ RES = YRES;
+ }
+ max = len * RES;
+ val1 = B->val1 * (double)(max);
+ val2 = B->val2 * (double)(max);
+
+ if (val1<1) val1=1;
+ else if (val1>max) val1=max;
+
+ if (val2<1) val2=1;
+ else if (val2>max) val2=max;
+
+ // create this bar
+ drv_generic_text_bar_create_bar (row, col, dir, len, val1, val2);
+
+ // process all bars
+ drv_generic_text_bar_create_segments ();
+ drv_generic_text_bar_pack_segments ();
+ drv_generic_text_bar_define_chars(drv_defchar);
+
+ // reset usage flags
+ for (s=0; s<nSegment; s++) {
+ Segment[s].used=0;
+ }
+
+ // set usage flags
+ for (n=0; n<LROWS*LCOLS; n++) {
+ if ((s=Bar[n].segment)!=-1) Segment[s].used=1;
+ }
+
+ // transfer bars into layout buffer
+ for (n=0; n<LCOLS*LROWS; n++) {
+ s=Bar[n].segment;
+ if (s==-1) continue;
+ c=Segment[s].ascii;
+ if (c==-1) continue;
+ if(c==LayoutFB[n]) continue;
+ LayoutFB[n]=c;
+ }
+
+ // transfer differences to the display
+ for (row=0; row<DROWS; row++) {
+ for (col=0; col<DCOLS; col++) {
+ int pos1, pos2, equal;
+ if (LayoutFB[row*LCOLS+col]==DisplayFB[row*DCOLS+col]) continue;
+ drv_goto (row, col);
+ for (pos1=col, pos2=pos1, col++, equal=0; col<DCOLS; col++) {
+ if (LayoutFB[row*LCOLS+col]==DisplayFB[row*DCOLS+col]) {
+ // If we find just one equal byte, we don't break, because this
+ // would require a goto, which takes several bytes, too.
+ if (++equal>goto_len) break;
+ } else {
+ pos2=col;
+ equal=0;
+ }
+ }
+ memcpy (DisplayFB+row*DCOLS+pos1, LayoutFB+row*LCOLS+pos1, pos2-pos1+1);
+ drv_write (DisplayFB+row*DCOLS+pos1, pos2-pos1+1);
+ debug ("Michi: bar(%d,%d) len=%d", row, pos1, pos2-pos1+1);
+ }
+ }
+
+ return 0;
+
+}
+
+
+// ****************************************
+// *** generic init/quit ***
+// ****************************************
+
+int drv_generic_text_init (char *driver)
+{
+
+ Driver=driver;
+
+ // init display framebuffer
+ DisplayFB = (char*)malloc(DCOLS*DROWS*sizeof(char));
+ memset (DisplayFB, ' ', DROWS*DCOLS*sizeof(char));
+
+ // init layout framebuffer
+ LROWS = 0;
+ LCOLS = 0;
+ LayoutFB=NULL;
+ drv_generic_text_resizeFB (DROWS, DCOLS);
+
+ // sanity check
+ if (LayoutFB==NULL || DisplayFB==NULL) {
+ error ("%s: framebuffer could not be allocated: malloc() failed", Driver);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int drv_generic_text_bar_init (void)
+{
+ if (Bar) free (Bar);
+
+ if ((Bar=malloc (LROWS*LCOLS*sizeof(BAR)))==NULL) {
+ error ("bar buffer allocation failed: out of memory");
+ return -1;
+ }
+
+ nSegment=0;
+ fSegment=0;
+
+ drv_generic_text_bar_clear();
+
+ return 0;
+}
+
+
+void drv_generic_text_bar_add_segment(int val1, int val2, DIRECTION dir, int ascii)
+{
+ Segment[fSegment].val1=val1;
+ Segment[fSegment].val2=val2;
+ Segment[fSegment].dir=dir;
+ Segment[fSegment].used=0;
+ Segment[fSegment].ascii=ascii;
+
+ fSegment++;
+ nSegment=fSegment;
+}
+
+
+int drv_generic_text_quit (void) {
+
+ if (LayoutFB) {
+ free(LayoutFB);
+ LayoutFB=NULL;
+ }
+
+ if (DisplayFB) {
+ free(DisplayFB);
+ DisplayFB=NULL;
+ }
+
+ if (Bar) {
+ free (Bar);
+ Bar=NULL;
+ }
+
+ return (0);
+}
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