Ardafruit GFX bitmap functions with example

Nkawu · Jul 8, 2016 · 39dad32 · 39dad32
1 parent d37e5c4
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diff --git a/TFT_22_ILI9225.cpp b/TFT_22_ILI9225.cpp
@@ -554,3 +554,90 @@ uint16_t TFT_22_ILI9225::drawChar(uint16_t x, uint16_t y, uint16_t ch, uint16_t
 	return charWidth;
 }
 
+// Draw a 1-bit image (bitmap) at the specified (x,y) position from the
+// provided bitmap buffer (must be PROGMEM memory) using the specified
+// foreground color (unset bits are transparent).
+void TFT_22_ILI9225::drawBitmap(int16_t x, int16_t y,
+const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
+
+	int16_t i, j, byteWidth = (w + 7) / 8;
+	uint8_t byte;
+
+	for (j = 0; j < h; j++) {
+		for (i = 0; i < w; i++) {
+			if (i & 7) byte <<= 1;
+			else      byte   = pgm_read_byte(bitmap + j * byteWidth + i / 8);
+			if (byte & 0x80) drawPixel(x + i, y + j, color);
+		}
+	}
+}
+
+// Draw a 1-bit image (bitmap) at the specified (x,y) position from the
+// provided bitmap buffer (must be PROGMEM memory) using the specified
+// foreground (for set bits) and background (for clear bits) colors.
+void TFT_22_ILI9225::drawBitmap(int16_t x, int16_t y,
+const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) {
+
+	int16_t i, j, byteWidth = (w + 7) / 8;
+	uint8_t byte;
+
+	for (j = 0; j < h; j++) {
+		for (i = 0; i < w; i++ ) {
+			if (i & 7) byte <<= 1;
+			else      byte   = pgm_read_byte(bitmap + j * byteWidth + i / 8);
+			if (byte & 0x80) drawPixel(x + i, y + j, color);
+			else            drawPixel(x + i, y + j, bg);
+		}
+	}
+}
+
+// drawBitmap() variant for RAM-resident (not PROGMEM) bitmaps.
+void TFT_22_ILI9225::drawBitmap(int16_t x, int16_t y,
+uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
+
+	int16_t i, j, byteWidth = (w + 7) / 8;
+	uint8_t byte;
+
+	for(j = 0; j < h; j++) {
+		for(i = 0; i < w; i++) {
+			if (i & 7) byte <<= 1;
+			else      byte   = bitmap[j * byteWidth + i / 8];
+			if (byte & 0x80) drawPixel(x + i, y + j, color);
+		}
+	}
+}
+
+// drawBitmap() variant w/background for RAM-resident (not PROGMEM) bitmaps.
+void TFT_22_ILI9225::drawBitmap(int16_t x, int16_t y,
+uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) {
+
+	int16_t i, j, byteWidth = (w + 7) / 8;
+	uint8_t byte;
+
+	for (j = 0; j < h; j++) {
+		for (i = 0; i < w; i++ ) {
+			if (i & 7) byte <<= 1;
+			else      byte   = bitmap[j * byteWidth + i / 8];
+			if (byte & 0x80) drawPixel(x + i, y + j, color);
+			else            drawPixel(x + i, y + j, bg);
+		}
+	}
+}
+
+//Draw XBitMap Files (*.xbm), exported from GIMP,
+//Usage: Export from GIMP to *.xbm, rename *.xbm to *.c and open in editor.
+//C Array can be directly used with this function
+void TFT_22_ILI9225::drawXBitmap(int16_t x, int16_t y,
+const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
+
+	int16_t i, j, byteWidth = (w + 7) / 8;
+	uint8_t byte;
+
+	for (j = 0; j < h; j++) {
+		for (i = 0; i < w; i++ ) {
+			if (i & 7) byte >>= 1;
+			else      byte   = pgm_read_byte(bitmap + j * byteWidth + i / 8);
+			if (byte & 0x01) drawPixel(x + i, y + j, color);
+		}
+	}
+}
diff --git a/TFT_22_ILI9225.h b/TFT_22_ILI9225.h
@@ -270,6 +270,12 @@ class TFT_22_ILI9225 {
 		/// @param	color 16-bit color, default=white
 		uint16_t drawChar(uint16_t x, uint16_t y, uint16_t ch, uint16_t color = COLOR_WHITE);
 
+		void drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color);
+		void drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg);
+		void drawBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h, uint16_t color);
+		void drawBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg);
+		void drawXBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color);
+
 	private:
 
 		void	 _swap(uint16_t &a, uint16_t &b),