David Lowe / SPI_TFT_ILI9341

Lib for the new LCD Display with ILI9341 controller Modified for huge fonts (>255 bytes/char). Needs modified font.h files with 2-byte size parameter. Window size is set on a per-character basis to minimise the number of pixels written (speed-up, plus better detection of whether one last character will fit on the current line). NUCLEO & NXP DMA-enabled versions are modified but untested.

Dependents:   Mandelbrot

Fork of SPI_TFT_ILI9341 by Peter Drescher

Diff: SPI_TFT_ILI9341.cpp

Revision:
16:51b40ebe3280
Parent:
15:b73b8a8c4692
Child:
17:8794e2eadd8d
--- a/SPI_TFT_ILI9341.cpp	Sun Nov 30 12:20:56 2014 +0000
+++ b/SPI_TFT_ILI9341.cpp	Mon Dec 08 10:03:05 2014 +0000
@@ -575,14 +575,14 @@
 
 int SPI_TFT_ILI9341::columns()
 {
-    return width() / font[1];
+    return width() / font[2];
 }
 
 
 
 int SPI_TFT_ILI9341::rows()
 {
-    return height() / font[2];
+    return height() / font[3];
 }
 
 
@@ -591,8 +591,8 @@
 {
     if (value == '\n') {    // new line
         char_x = 0;
-        char_y = char_y + font[2];
-        if (char_y >= height() - font[2]) {
+        char_y = char_y + font[3];
+        if (char_y >= height() - font[3]) {
             char_y = 0;
         }
     } else {
@@ -611,27 +611,29 @@
     if ((c < 31) || (c > 127)) return;   // test char range
 
     // read font parameter from start of array
-    offset = font[0];                    // bytes / char
-    hor = font[1];                       // get hor size of font
-    vert = font[2];                      // get vert size of font
-    bpl = font[3];                       // bytes per line
+    offset = (font[0]<<8)+font[1];       // bytes / char now 16bits
+    hor = font[2];                       // get hor size of font
+    vert = font[3];                      // get vert size of font
+    bpl = font[4];                       // bytes per line
 
-    if (char_x + hor > width()) {
+    zeichen = &font[((c-32) * offset)+5];
+    w=zeichen[0];
+    
+    //check whether there are sufficient pixels to render character
+    if (char_x + w+2 > width()) { //was hor, now w+2 -> enables squeezing extra char at end of line)
         char_x = 0;
         char_y = char_y + vert;
-        if (char_y >= height() - font[2]) {
+        if (char_y >= height() - vert) {
             char_y = 0;
         }
     }
-    window(char_x, char_y,hor,vert); // char box
+    window(char_x, char_y,w+2,vert); // was hor, now w+2 -> char box shrunk to smallest size we need (speedup)
     wr_cmd(0x2C);  // send pixel
     #ifndef TARGET_KL25Z  // 16 Bit SPI 
     SPI::format(16,3);   
     #endif                         // switch to 16 bit Mode 3
-    zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
-    w = zeichen[0];                          // width of actual char
      for (j=0; j<vert; j++) {  //  vert line
-        for (i=0; i<hor; i++) {   //  horz line
+        for (i=0; i<w+2; i++) {  //w+2 was hor, send just enough pixel data to fill window  //  horz line
             z =  zeichen[bpl * i + ((j & 0xF8) >> 3)+1];
             b = 1 << (j & 0x07);
             if (( z & b ) == 0x00) {