Renesas / AsciiFont

Draw the character of the ASCII code.

Dependents:   mbed-os_Watson-IoT_ZXing_sample mbed-os_Watson-IoT_ZXing_sample MovPlayer GR-PEACH_HVC-P2_sample_client ... more

Fork of AsciiFont by Daiki Kato

AsciiFont

This is a library to draw the ASCII font characters.

Example

#include "mbed.h"
#include "AsciiFont.h"

#define WIDTH           (12)
#define HEIGHT          (16)
#define BYTE_PER_PIXEL  (1u)
#define STRIDE          (((WIDTH * BYTE_PER_PIXEL) + 7u) & ~7u) //multiple of 8

uint8_t text_field[STRIDE * HEIGHT];

//for debug
void print_text_field() {
    int idx = 0;

    for (int i = 0; i < HEIGHT; i++) {
        for (int j = 0; j < STRIDE; j++) {
            printf("%02x", text_field[idx++]);
        }
        printf("\r\n");
    }
    printf("\r\n");
}

int main() {
    AsciiFont ascii_font(text_field, WIDTH, HEIGHT, STRIDE, BYTE_PER_PIXEL);

    ascii_font.Erase(0xcc);
    ascii_font.DrawStr("AB", 0, 0, 0x11, 1);
    ascii_font.DrawChar('C', AsciiFont::CHAR_PIX_WIDTH,
                        AsciiFont::CHAR_PIX_HEIGHT, 0x22, 1);
    print_text_field(); //debug print

    ascii_font.Erase();
    ascii_font.DrawStr("D", 0, 0, 0xef, 2);
    print_text_field(); //debug print

    ascii_font.Erase(0x11, 6, 0, 6, 8);
    print_text_field(); //debug print
}


API

Import library
AsciiFont - AsciiFont Class Reference

Public Member Functions

AsciiFont (uint8_t *p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour=0)
Constructor: Initializes AsciiFont .
void Erase ()
Erase text field.
void Erase (uint32_t const colour)
Erase text field.
void Erase (uint32_t const colour, int x, int y, int width, int height)
Erase text field.
int DrawStr (char *str, int x, int y, uint32_t const colour, int font_size=1, uint16_t const max_char_num=0xffff)
Draw a string.
bool DrawChar (char c, int x, int y, uint32_t const colour, int font_size=1)
Draw a character.

Static Public Attributes

static const int CHAR_PIX_WIDTH = 6
The pixel width of a character.
static const int CHAR_PIX_HEIGHT = 8
The pixel height of a character.

Files at this revision

API Documentation at this revision

Revision 5:1eaa4942db53, committed 2017-03-07

Comitter:
dkato
Date:
Tue Mar 07 05:04:28 2017 +0000
Parent:
4:8fb5219bbc09
Commit message:
Added range check to Erase function.

Changed in this revision

AsciiFont.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r 8fb5219bbc09 -r 1eaa4942db53 AsciiFont.cpp
--- a/AsciiFont.cpp	Mon Jan 23 06:20:37 2017 +0000
+++ b/AsciiFont.cpp	Tue Mar 07 05:04:28 2017 +0000
@@ -20,6 +20,12 @@
     int wk_idx, i, j ,k;
 
     background_colour = colour;
+    if ((x + width) > max_width) {
+        width = max_width - x;
+    }
+    if ((y + height) > max_height) {
+        height = max_height - y;
+    }
     idx_base = (x * pixel_num) + (buf_stride * y);
     for (i = 0; i < height; i++) {
         wk_idx = idx_base + (buf_stride * i);
@@ -95,3 +101,4 @@
     }
     return true;
 }
+