feature: font_gfx

firmware/shared_libs/display/font_gfx.c

@@ -0,0 +1,92 @@
+/*
+ * fonts.c
+ *
+ *  Created on: 23 maj 2021
+ *      Author: bartool
+ */
+
+// #include "main.h"
+#include "fonts.h"
+
+static uint8_t font_string_lenght_px(const FONT_INFO *font, uint8_t *text);
+
+/**
+ * @brief Write string at at the specified (x,y) position.
+ * @param disp A pointer to display struct
+ * @param font A pointer to font struct.
+ * @param text A pointer to string data.
+ * @param pos_x Top left corner x coordinate
+ * @param pos_yTop left corner y coordinate
+ * @param color Color of pixel BM_NORMAL or BM_INVERSE for bitmap.
+ * @return uint8_t
+ */
+uint8_t DISP_writeString(GFX_display_t *disp, const FONT_INFO *font, uint8_t *text, uint8_t pos_x, uint8_t pos_y, GFX_BitmapColor_t color)
+{
+	uint8_t actual_char, char_nr;
+	GFX_bitmap_t char_bitmap;
+	const FONT_CHAR_INFO *charinfo;
+
+	uint8_t height = font->heightPixels;
+	uint8_t x = pos_x;
+	uint8_t width = font_string_lenght_px(font, text);
+
+	switch (color)
+	{
+	case BM_INVERSE:
+		// SSD1306_clear_buffer(width + 2, height + 2, pos_x - 1, pos_y - 1, WHITE);
+		// ST7565_writeBitmap(st7565_buffor, NULL, width + 2, height + 2, pos_x - 1, pos_y - 1, WHITE);
+		DISP_drawFillRect(disp, pos_x - 1, pos_y - 1, width + 2, height + 2);
+		break;
+	default:
+		// SSD1306_clear_buffer(width + 2, height + 2, pos_x - 1, pos_y - 1, BLACK);
+		// ST7565_writeBitmap(st7565_buffor, NULL, width + 2, height + 2, pos_x - 1, pos_y - 1, BLACK);
+		DISP_clearRegion(disp, pos_x - 1, pos_y - 1, width + 2, height + 2);
+		break;
+	}
+
+	while (*text)
+	{
+		actual_char = *text++;
+		if (actual_char < font->startChar || actual_char > font->endChar)
+		{
+			if (actual_char == ' ')
+			{
+				x += font->spacePixels;
+			}
+			continue;
+		}
+
+		char_nr = actual_char - font->startChar;
+		charinfo = &font->charInfo[char_nr];
+
+		char_bitmap.height = height,
+		char_bitmap.width = charinfo->widthBits,
+		char_bitmap.bitmap = font->data + charinfo->offset,
+
+		DISP_drawBitmap(disp, &char_bitmap, x, pos_y, color);
+
+		x += charinfo->widthBits + font->interspacePixels;
+	}
+
+	return x;
+}
+
+static uint8_t font_string_lenght_px(const FONT_INFO *font, uint8_t *text)
+{
+	uint8_t width = 0;
+	while (*text)
+	{
+		uint8_t actual_char = *text++;
+		uint8_t char_nr = actual_char - font->startChar;
+		if (actual_char < font->startChar || actual_char > font->endChar)
+		{
+			if (actual_char == ' ')
+			{
+				width += font->spacePixels;
+			}
+			continue;
+		}
+		width += font->charInfo[char_nr].widthBits + font->interspacePixels;
+	}
+	return width;
+}

firmware/shared_libs/display/font_gfx.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "main.h"
+#include "display_gfx.h"
+// This structure describes a single character's display information
+typedef struct
+{
+    const uint8_t widthBits; // width, in bits (or pixels), of the character
+    const uint16_t offset;   // offset of the character's bitmap, in bytes, into the the GFX_font_t's data array
+
+} GFX_fontChar_t;
+
+// Describes a single font
+typedef struct
+{
+    //	uint8_t DownSpace;	// Downs Space in pixels
+    uint8_t heightPixels; // height, in pages (8 pixels), of the font's characters
+    uint8_t startChar;    // the first character in the font (e.g. in charInfo and data)
+    uint8_t endChar;
+    uint8_t interspacePixels;       // number of pixels of interspace between characters
+    uint8_t spacePixels;            // number of pixels of space character
+    const GFX_fontChar_t *charInfo; // pointer to array of char information
+    const uint8_t *data;            // pointer to generated array of character visual representation
+    //        char * FontFileName;    // (Pointer) Font filename saved on SD card or 0 (null) otherwise
+    //        uint8_t bitOrientation;  // bits and byte orientation 0-T2B, 1-L2R
+} GFX_font_t;
+
+uint8_t DISP_writeString(GFX_display_t *disp, const GFX_font_t *font, uint8_t *text, uint8_t pos_x, uint8_t pos_y, GFX_BitmapColor_t color);