chore: shrink 5x7 font

ili9341.c

@@ -338,12 +338,12 @@ void
 ili9341_drawchar_5x7(uint8_t ch, int x, int y, uint16_t fg, uint16_t bg)
 {
   uint16_t *buf = spi_buffer;
-  uint16_t bits;
+  uint8_t bits;
   int c, r;
   for(c = 0; c < 7; c++) {
     bits = x5x7_bits[(ch * 7) + c];
     for (r = 0; r < 5; r++) {
-      *buf++ = (0x8000 & bits) ? fg : bg;
+      *buf++ = (0x80 & bits) ? fg : bg;
       bits <<= 1;
     }
   }
@@ -364,12 +364,12 @@ void
 ili9341_drawchar_size(uint8_t ch, int x, int y, uint16_t fg, uint16_t bg, uint8_t size)
 {
   uint16_t *buf = spi_buffer;
-  uint16_t bits;
+  uint8_t bits;
   int c, r;
   for(c = 0; c < 7*size; c++) {
     bits = x5x7_bits[(ch * 7) + (c / size)];
     for (r = 0; r < 5*size; r++) {
-      *buf++ = (0x8000 & bits) ? fg : bg;
+      *buf++ = (0x80 & bits) ? fg : bg;
       if (r % size == (size-1)) {
           bits <<= 1;
       }

nanovna.h

@@ -152,7 +152,7 @@ extern int area_height;
 
 // font
 
-extern const uint16_t x5x7_bits [];
+extern const uint8_t x5x7_bits [];
 extern const uint32_t numfont20x24[][24];
 
 #define S_PI    "\034"

plot.c

@@ -1056,7 +1056,7 @@ draw_marker(int w, int h, int x, int y, int c, int ch)
       int cc = c;
       if (j <= 9 && j > 2 && i >= -1 && i <= 3) {
         uint16_t bits = x5x7_bits[(ch * 7) + (9-j)];
-        if (bits & (0x8000>>(i+1)))
+        if (bits & (0x80>>(i+1)))
           cc = 0;
       }
       if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w)
@@ -1355,7 +1355,7 @@ request_to_draw_cells_behind_numeric_input(void)
 void
 cell_drawchar_5x7(int w, int h, uint8_t ch, int x, int y, uint16_t fg, int invert)
 {
-  uint16_t bits;
+  uint8_t bits;
   int c, r;
   if (y <= -7 || y >= h || x <= -5 || x >= w)
     return;
@@ -1366,7 +1366,7 @@ cell_drawchar_5x7(int w, int h, uint8_t ch, int x, int y, uint16_t fg, int inver
     if (invert)
       bits = ~bits;
     for (r = 0; r < 5; r++) {
-      if ((x+r) >= 0 && (x+r) < w && (0x8000 & bits)) 
+      if ((x+r) >= 0 && (x+r) < w && (0x80 & bits)) 
         spi_buffer[(y+c)*w + (x+r)] = fg;
       bits <<= 1;
     }