[lcd4linux @ 2002-08-19 07:36:29 by reinelt]

finished bar.c, USBLCD is the first driver that uses the generic bar functions

1 files changed, 373 insertions, 1 deletions

diff --git a/bar.c b/bar.c
index f0df581..e48ae4d 100644
--- a/bar.c
+++ b/bar.c
@@ -1,4 +1,4 @@
-/* $Id: bar.c,v 1.1 2002/08/19 04:41:20 reinelt Exp $
+/* $Id: bar.c,v 1.2 2002/08/19 07:36:29 reinelt Exp $
  *
  * generic bar handling
  *
@@ -20,6 +20,10 @@
  *
  *
  * $Log: bar.c,v $
+ * Revision 1.2  2002/08/19 07:36:29  reinelt
+ *
+ * finished bar.c, USBLCD is the first driver that uses the generic bar functions
+ *
  * Revision 1.1  2002/08/19 04:41:20  reinelt
  * introduced bar.c, moved bar stuff from display.h to bar.h
  *
@@ -29,9 +33,377 @@
 /* 
  * exported functions:
  *
+ * int bar_init (int rows, int cols, int xres, int yres, int chars)
+ *
+ * void bar_clear(void)
+ *
+ * void bar_add_segment(int len1, int len2, int type, int ascii)
+ *
+ * int bar_draw (int type, int row, int col, int max, int len1, int len2)
+ *
+ * int bar_process (void)
+ *
+ * int bar_peek (int row, int col)
  *
  */
 
+#include <stdlib.h>
+
 #include "bar.h"
 #include "debug.h"
 
+
+static int ROWS=0;
+static int COLS=0;
+static int XRES=0;
+static int YRES=0;
+static int CHARS=0;
+
+static int nSegment=0;
+static int fSegment=0;
+static SEGMENT Segment[128];
+
+static BAR *Bar=NULL;
+
+
+int bar_init (int rows, int cols, int xres, int yres, int chars)
+{
+  if (rows<1 || cols<1) 
+    return -1;
+  
+  ROWS=rows;
+  COLS=cols;
+  XRES=xres;
+  YRES=yres;
+  CHARS=chars;
+
+  if (Bar) {
+    free (Bar);
+  }
+  
+  if ((Bar=malloc (ROWS*COLS*sizeof(BAR)))==NULL) {
+    return -1;
+  }
+
+  bar_clear();
+
+  nSegment=0;
+  fSegment=0;
+
+  return 0;
+}
+
+
+void bar_clear(void)
+{
+  int n;
+
+  for (n=0; n<ROWS*COLS; n++) {
+    Bar[n].len1=-1;
+    Bar[n].len2=-1;
+    Bar[n].type=0;
+    Bar[n].segment=-1;
+  }
+
+}
+
+
+void bar_add_segment(int len1, int len2, int type, int ascii)
+{
+  Segment[fSegment].len1=len1;
+  Segment[fSegment].len2=len2;
+  Segment[fSegment].type=type;
+  Segment[fSegment].used=0;
+  Segment[fSegment].ascii=ascii;
+  
+  fSegment++;
+  nSegment=fSegment;
+}
+
+
+int bar_draw (int type, int row, int col, int max, int len1, int len2)
+{
+  int rev=0;
+  
+  if (len1<1) len1=1;
+  else if (len1>max) len1=max;
+  
+  if (len2<1) len2=1;
+  else if (len2>max) len2=max;
+  
+  switch (type) {
+  case BAR_L:
+    len1=max-len1;
+    len2=max-len2;
+    rev=1;
+    
+  case BAR_R:
+    while (max>0 && col<COLS) {
+      Bar[row*COLS+col].type=type;
+      Bar[row*COLS+col].segment=-1;
+      if (len1>=XRES) {
+	Bar[row*COLS+col].len1=rev?0:XRES;
+	len1-=XRES;
+      } else {
+	Bar[row*COLS+col].len1=rev?XRES-len1:len1;
+	len1=0;
+      }
+      if (len2>=XRES) {
+	Bar[row*COLS+col].len2=rev?0:XRES;
+	len2-=XRES;
+      } else {
+	Bar[row*COLS+col].len2=rev?XRES-len2:len2;
+	len2=0;
+      }
+      max-=XRES;
+      col++;
+    }
+    break;
+
+  case BAR_U:
+    len1=max-len1;
+    len2=max-len2;
+    rev=1;
+    
+  case BAR_D:
+    while (max>0 && row<ROWS) {
+      Bar[row*COLS+col].type=type;
+      Bar[row*COLS+col].segment=-1;
+      if (len1>=YRES) {
+	Bar[row*COLS+col].len1=rev?0:YRES;
+	len1-=YRES;
+      } else {
+	Bar[row*COLS+col].len1=rev?YRES-len1:len1;
+	len1=0;
+      }
+      if (len2>=YRES) {
+	Bar[row*COLS+col].len2=rev?0:YRES;
+	len2-=YRES;
+      } else {
+	Bar[row*COLS+col].len2=rev?YRES-len2:len2;
+	len2=0;
+      }
+      max-=YRES;
+      row++;
+    }
+    break;
+
+  }
+  return 0;
+}
+
+
+static void create_segments (void)
+{
+  int i, j, n;
+  
+  /* 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<ROWS*COLS; n++) {
+    if (Bar[n].type==0) continue;
+    for (i=0; i<nSegment; i++) {
+      if (Segment[i].type & Bar[n].type &&
+	  Segment[i].len1== Bar[n].len1 &&
+	  Segment[i].len2== Bar[n].len2) break;
+    }
+    if (i==nSegment) {
+      nSegment++;
+      Segment[i].len1=Bar[n].len1;
+      Segment[i].len2=Bar[n].len2;
+      Segment[i].type=Bar[n].type;
+      Segment[i].used=0;
+      Segment[i].ascii=-1;
+    }
+    Bar[n].segment=i;
+  }
+}
+
+
+static int segment_deviation (int i, int j)
+{
+  int RES;
+  int i1, i2, j1, j2;
+  
+  if (i==j) return 65535;
+  if (!(Segment[i].type & Segment[j].type)) return 65535;
+  if (Segment[i].len1==0 && Segment[j].len1!=0) return 65535;
+  if (Segment[i].len2==0 && Segment[j].len2!=0) return 65535;
+  RES=Segment[i].type & BAR_H ? XRES:YRES;
+  if (Segment[i].len1>=RES && Segment[j].len1<RES) return 65535;
+  if (Segment[i].len2>=RES && Segment[j].len2<RES) return 65535;
+  if (Segment[i].len1==Segment[i].len2 && Segment[j].len1!=Segment[j].len2) return 65535;
+
+  i1=Segment[i].len1; if (i1>RES) i1=RES;
+  i2=Segment[i].len2; if (i2>RES) i2=RES;
+  j1=Segment[j].len1; if (j1>RES) i1=RES;
+  j2=Segment[j].len2; if (j2>RES) i2=RES;
+  
+  return (i1-i2)*(i1-i2)+(j1-j2)*(j1-j2);
+}
+
+
+static void pack_segments (void)
+{
+  int i, j, n, min;
+  int pack_i, pack_j;
+  int pass1=1;
+  int deviation[nSegment][nSegment];
+  
+  if (nSegment<=fSegment+CHARS) {
+    return;
+  }
+
+  for (i=0; i<nSegment-1; i++) {
+    for (j=i+1; j<nSegment; j++) {
+      int d=segment_deviation(i,j);
+      deviation[i][j]=d;
+      deviation[j][i]=d;
+    }
+  }
+    
+  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 (deviation[i][j]<min) {
+	  min=deviation[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;
+      }
+    } 
+      
+    nSegment--;
+    Segment[pack_i]=Segment[nSegment];
+      
+    for (i=0; i<nSegment; i++) {
+      deviation[pack_i][i]=deviation[nSegment][i];
+      deviation[i][pack_i]=deviation[i][nSegment];
+    }
+      
+    for (n=0; n<ROWS*COLS; n++) {
+      if (Bar[n].segment==pack_i)   Bar[n].segment=pack_j;
+      if (Bar[n].segment==nSegment) Bar[n].segment=pack_i;
+    }
+  }
+}
+
+
+static void define_chars (int(*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].type) {
+    case BAR_L:
+      for (j=0; j<4; j++) {
+#if 0
+	char Pixel[] = { 0, 1, 3, 7, 15, 31 };
+	buffer[j  ]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+#else
+	buffer[j  ]=(1<<Segment[i].len1)-1;
+	buffer[j+4]=(1<<Segment[i].len2)-1;
+#endif
+      }
+      break;
+    case BAR_R:
+      for (j=0; j<4; j++) {
+#if 0
+	char Pixel[] = { 0, 16, 24, 28, 30, 31 };
+	buffer[j  ]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+#else
+	buffer[j  ]=255<<(XRES-Segment[i].len1);
+	buffer[j+4]=255<<(XRES-Segment[i].len2);
+#endif
+      }
+      break;
+    case BAR_U:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[7-j]=(1<<XRES)-1;
+      }
+      for (; j<YRES; j++) {
+	buffer[7-j]=0;
+      }
+      break;
+    case BAR_D:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[j]=(1<<XRES)-1;
+      }
+      for (; j<YRES; j++) {
+	buffer[j]=0;
+      }
+      break;
+    }
+    defchar(c, buffer);
+  }
+}
+
+
+int bar_process (int(*defchar)(int ascii, char *matrix))
+{
+  int n, s;
+  
+  create_segments();
+  pack_segments();
+  define_chars(defchar);
+  
+  for (s=0; s<nSegment; s++) {
+    Segment[s].used=0;
+  }
+
+  for (n=0; n<ROWS*COLS; n++) {
+    s=Bar[n].segment;
+    if (s!=-1) {
+      Segment[s].used=1;
+    }
+  }
+  
+  return 0;
+}
+
+
+int bar_peek (int row, int col)
+{
+  int s;
+
+  s=Bar[row*COLS+col].segment;
+  if (s==-1) {
+    return -1;
+  } else {
+    return Segment[s].ascii;
+  }
+}