[lcd4linux @ 2004-01-20 05:36:59 by reinelt]

moved text-display-specific stuff to drv_generic_text
moved all the bar stuff from drv_generic_bar to generic_text

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@322 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 612 insertions, 0 deletions

diff --git a/drv_generic_text.c b/drv_generic_text.c
new file mode 100644
index 0000000..d9353fd
--- /dev/null
+++ b/drv_generic_text.c
@@ -0,0 +1,612 @@
+/* $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);
+}