David Smart / RA8875 Featured

Library to control a Graphics TFT connected to 4-wire SPI - revised for the Raio RA8875 Display Controller.

Dependents:   FRDM_RA8875_mPaint RA8875_Demo RA8875_KeyPadDemo SignalGenerator ... more

Fork of SPI_TFT by Peter Drescher

See Components - RA8875 Based Display

Enhanced touch-screen support - where it previous supported both the Resistive Touch and Capacitive Touch based on the FT5206 Touch Controller, now it also has support for the GSL1680 Touch Controller.

Offline Help Manual (Windows chm)

/media/uploads/WiredHome/ra8875.zip.bin (download, rename to .zip and unzip)

Diff: GraphicsDisplay.cpp

Revision:
101:e0aad446094a
Parent:
100:0b084475d5a9
Child:
104:8d1d3832a215
--- a/GraphicsDisplay.cpp	Sat Dec 19 15:55:09 2015 +0000
+++ b/GraphicsDisplay.cpp	Sun Jan 17 22:16:37 2016 +0000
@@ -93,7 +93,7 @@
 
 int GraphicsDisplay::character(int x, int y, int c)
 {
-    return fontblit(x, y, font, c);
+    return fontblit(x, y, c);
 }
 
 RetCode_t GraphicsDisplay::window(loc_t x, loc_t y, dim_t w, dim_t h)
@@ -165,7 +165,9 @@
 //0x00,...             // ' ' data stream.
 //0x00,0x06,0x00,0x07,0x80,0x07,0xC0,0x07,0xC0,0x07,0xC0 // '!'
 //...
-int GraphicsDisplay::fontblit(int x, int y, const unsigned char * fontTable, const unsigned char c)
+
+
+const uint8_t * GraphicsDisplay::getCharMetrics(const unsigned char c, uint8_t * width, uint8_t * height)
 {
     uint16_t offsetToCharLookup;
     uint16_t firstChar = font[3] * 256 + font[2];
@@ -175,42 +177,74 @@
     
     INFO("first:%d, last:%d, c:%d", firstChar, lastChar, c);
     if (c < firstChar || c > lastChar)
+        return NULL;       // advance zero pixels since it was unprintable...
+    
+    // 8 bytes of preamble to the first level lookup table
+    offsetToCharLookup = 8 + 4 * (c - firstChar);    // 4-bytes: width(pixels), 16-bit offset from table start, 0
+    uint8_t charWidth = font[offsetToCharLookup];
+    charRecord = font + font[offsetToCharLookup + 2] * 256 + font[offsetToCharLookup + 1];
+    //INFO("hgt:%d, wdt:%d", charHeight, charWidth);
+    if (width)
+        *width = charWidth;
+    if (height)
+        *height = charHeight;
+    return charRecord;
+}
+
+int GraphicsDisplay::fontblit(int x, int y, const unsigned char c)
+{
+    #if 0
+    uint16_t offsetToCharLookup;
+    uint16_t firstChar = font[3] * 256 + font[2];
+    uint16_t lastChar  = font[5] * 256 + font[4];
+    uint8_t charHeight = font[6];
+    const unsigned char * charRecord;   // width, data, data, data, ...
+    
+    INFO("first:%d, last:%d, c:%d", firstChar, lastChar, c);
+    if (c < firstChar || c > lastChar)
         return 0;       // advance zero pixels since it was unprintable...
     
     // 8 bytes of preamble to the first level lookup table
     offsetToCharLookup = 8 + 4 * (c - firstChar);    // 4-bytes: width(pixels), 16-bit offset from table start, 0
     uint8_t charWidth = font[offsetToCharLookup];
     charRecord = font + font[offsetToCharLookup + 2] * 256 + font[offsetToCharLookup + 1];
-
-    INFO("hgt:%d, wdt:%d", charHeight, charWidth);
-    // clip to the edge of the screen
-    //if (x + charWidth >= width())
-    //    charWidth = width() - x;
-    //if (y + charHeight >= height())
-    //    charHeight = height() - y;
-    window(x, y, charWidth, charHeight);
-    _StartGraphicsStream();
-    while (charHeight--) {
-        uint8_t pixels = charWidth;
-        uint8_t bitmask = 0x01;
-        
-        while (pixels) {
-            uint8_t byte = *charRecord;
-            INFO("byte, mask: %02X, %02X", byte, bitmask);
-            color_t c = (byte & bitmask) ? _foreground : _background;
-            _putp(c);
-            bitmask <<= 1;
-            if (pixels > 1 && bitmask == 0) {
-                bitmask = 0x01;
-                charRecord++;
+#endif
+    const unsigned char * charRecord;   // width, data, data, data, ...
+    uint8_t charWidth, charHeight;
+    charRecord = getCharMetrics(c, &charWidth, &charHeight);
+    if (charRecord) {
+        INFO("hgt:%d, wdt:%d", charHeight, charWidth);
+        // clip to the edge of the screen
+        //if (x + charWidth >= width())
+        //    charWidth = width() - x;
+        //if (y + charHeight >= height())
+        //    charHeight = height() - y;
+        window(x, y, charWidth, charHeight);
+        _StartGraphicsStream();
+        while (charHeight--) {
+            uint8_t pixels = charWidth;
+            uint8_t bitmask = 0x01;
+            
+            while (pixels) {
+                uint8_t byte = *charRecord;
+                INFO("byte, mask: %02X, %02X", byte, bitmask);
+                color_t c = (byte & bitmask) ? _foreground : _background;
+                _putp(c);
+                bitmask <<= 1;
+                if (pixels > 1 && bitmask == 0) {
+                    bitmask = 0x01;
+                    charRecord++;
+                }
+                pixels--;
             }
-            pixels--;
+            charRecord++;
         }
-        charRecord++;
+        _EndGraphicsStream();
+        WindowMax();
+        return charWidth;
+    } else {
+        return 0;
     }
-    _EndGraphicsStream();
-    WindowMax();
-    return charWidth;
 }
 
 // BMP Color Palette is BGRx