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
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
Public Member Functions |
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AsciiFont (uint8_t *p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour=0) | |
Constructor: Initializes
AsciiFont
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void | Erase () |
Erase text field.
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void | Erase (uint32_t const colour) |
Erase text field.
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void | Erase (uint32_t const colour, int x, int y, int width, int height) |
Erase text field.
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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.
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bool | DrawChar (char c, int x, int y, uint32_t const colour, int font_size=1) |
Draw a character.
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Static Public Attributes |
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static const int | CHAR_PIX_WIDTH = 6 |
The pixel width of a character.
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static const int | CHAR_PIX_HEIGHT = 8 |
The pixel height of a character.
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AsciiFont.cpp
- Committer:
- dkato
- Date:
- 2017-03-07
- Revision:
- 5:1eaa4942db53
- Parent:
- 4:8fb5219bbc09
File content as of revision 5:1eaa4942db53:
#include "mbed.h" #include "AsciiFont.h" #include "ascii.h" AsciiFont::AsciiFont(uint8_t * p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour) : p_text_field(p_buf), max_width(width), max_height(height), buf_stride(stride), pixel_num(byte_per_pixel), background_colour(colour) { } void AsciiFont::Erase() { Erase(background_colour, 0, 0, max_width, max_height); } void AsciiFont::Erase(uint32_t const colour) { Erase(colour, 0, 0, max_width, max_height); } void AsciiFont::Erase(uint32_t const colour, int x, int y, int width, int height) { int idx_base; 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); for (j = 0; j < width; j++) { for (k = (pixel_num - 1); k >= 0; k--) { p_text_field[wk_idx++] = (uint8_t)(background_colour >> (8 * k)); } } } } int AsciiFont::DrawStr(const char * str, int x, int y, uint32_t const colour, int font_size, uint16_t const max_char_num) { int char_num = 0; if ((str == NULL) || (font_size <= 0)) { return 0; } while ((*str != '\0') && (char_num < max_char_num)) { if (DrawChar(*str, x, y, colour, font_size) == false) { break; } str++; x += CHAR_PIX_WIDTH * font_size; char_num++; } return char_num; } bool AsciiFont::DrawChar(char c, int x, int y, uint32_t const colour, int font_size) { int idx_base; int idx_y = 0; int wk_idx, i, j ,k, fw, fh; char * p_pattern; uint8_t mask = 0x80; uint32_t wk_colour; if (font_size <= 0) { return false; } if ((x + (CHAR_PIX_WIDTH * font_size)) > max_width) { return false; } if ((y + (CHAR_PIX_HEIGHT * font_size)) > max_height) { return false; } if ((c >= 0x20) && (c <= 0x7e)) { p_pattern = (char *)&g_ascii_table[c - 0x20][0]; } else { p_pattern = (char *)&g_ascii_table[10][0]; /* '*' */ } idx_base = (x * pixel_num) + (buf_stride * y); /* Drawing */ for (i = 0; i < CHAR_PIX_HEIGHT; i++) { for (fh = 0; fh < font_size; fh++) { wk_idx = idx_base + (buf_stride * idx_y); for (j = 0; j < CHAR_PIX_WIDTH; j++) { if (p_pattern[j] & mask) { wk_colour = colour; } else { wk_colour = background_colour; } for (fw = 0; fw < font_size; fw++) { for (k = (pixel_num - 1); k >= 0; k--) { p_text_field[wk_idx++] = (uint8_t)(wk_colour >> (8 * k)); } } } idx_y++; } mask = (uint8_t)(mask >> 1); } return true; }