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@5:1eaa4942db53, 2017-03-07 (annotated)
- Committer:
- dkato
- Date:
- Tue Mar 07 05:04:28 2017 +0000
- Revision:
- 5:1eaa4942db53
- Parent:
- 4:8fb5219bbc09
Added range check to Erase function.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dkato | 0:99222c303e8f | 1 | #include "mbed.h" |
dkato | 0:99222c303e8f | 2 | #include "AsciiFont.h" |
dkato | 0:99222c303e8f | 3 | #include "ascii.h" |
dkato | 0:99222c303e8f | 4 | |
dkato | 0:99222c303e8f | 5 | AsciiFont::AsciiFont(uint8_t * p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour) : |
dkato | 0:99222c303e8f | 6 | p_text_field(p_buf), max_width(width), max_height(height), buf_stride(stride), pixel_num(byte_per_pixel), background_colour(colour) { |
dkato | 0:99222c303e8f | 7 | |
dkato | 0:99222c303e8f | 8 | } |
dkato | 0:99222c303e8f | 9 | |
dkato | 2:d0bc8c2974e0 | 10 | void AsciiFont::Erase() { |
dkato | 2:d0bc8c2974e0 | 11 | Erase(background_colour, 0, 0, max_width, max_height); |
dkato | 0:99222c303e8f | 12 | } |
dkato | 0:99222c303e8f | 13 | |
dkato | 2:d0bc8c2974e0 | 14 | void AsciiFont::Erase(uint32_t const colour) { |
dkato | 2:d0bc8c2974e0 | 15 | Erase(colour, 0, 0, max_width, max_height); |
dkato | 0:99222c303e8f | 16 | } |
dkato | 0:99222c303e8f | 17 | |
dkato | 2:d0bc8c2974e0 | 18 | void AsciiFont::Erase(uint32_t const colour, int x, int y, int width, int height) { |
dkato | 0:99222c303e8f | 19 | int idx_base; |
dkato | 0:99222c303e8f | 20 | int wk_idx, i, j ,k; |
dkato | 0:99222c303e8f | 21 | |
dkato | 0:99222c303e8f | 22 | background_colour = colour; |
dkato | 5:1eaa4942db53 | 23 | if ((x + width) > max_width) { |
dkato | 5:1eaa4942db53 | 24 | width = max_width - x; |
dkato | 5:1eaa4942db53 | 25 | } |
dkato | 5:1eaa4942db53 | 26 | if ((y + height) > max_height) { |
dkato | 5:1eaa4942db53 | 27 | height = max_height - y; |
dkato | 5:1eaa4942db53 | 28 | } |
dkato | 0:99222c303e8f | 29 | idx_base = (x * pixel_num) + (buf_stride * y); |
dkato | 0:99222c303e8f | 30 | for (i = 0; i < height; i++) { |
dkato | 0:99222c303e8f | 31 | wk_idx = idx_base + (buf_stride * i); |
dkato | 0:99222c303e8f | 32 | for (j = 0; j < width; j++) { |
dkato | 0:99222c303e8f | 33 | for (k = (pixel_num - 1); k >= 0; k--) { |
dkato | 0:99222c303e8f | 34 | p_text_field[wk_idx++] = (uint8_t)(background_colour >> (8 * k)); |
dkato | 0:99222c303e8f | 35 | } |
dkato | 0:99222c303e8f | 36 | } |
dkato | 0:99222c303e8f | 37 | } |
dkato | 0:99222c303e8f | 38 | } |
dkato | 0:99222c303e8f | 39 | |
dkato | 4:8fb5219bbc09 | 40 | int AsciiFont::DrawStr(const char * str, int x, int y, uint32_t const colour, int font_size, uint16_t const max_char_num) { |
dkato | 0:99222c303e8f | 41 | int char_num = 0; |
dkato | 0:99222c303e8f | 42 | |
dkato | 0:99222c303e8f | 43 | if ((str == NULL) || (font_size <= 0)) { |
dkato | 0:99222c303e8f | 44 | return 0; |
dkato | 0:99222c303e8f | 45 | } |
dkato | 0:99222c303e8f | 46 | while ((*str != '\0') && (char_num < max_char_num)) { |
dkato | 2:d0bc8c2974e0 | 47 | if (DrawChar(*str, x, y, colour, font_size) == false) { |
dkato | 0:99222c303e8f | 48 | break; |
dkato | 0:99222c303e8f | 49 | } |
dkato | 0:99222c303e8f | 50 | str++; |
dkato | 2:d0bc8c2974e0 | 51 | x += CHAR_PIX_WIDTH * font_size; |
dkato | 0:99222c303e8f | 52 | char_num++; |
dkato | 0:99222c303e8f | 53 | } |
dkato | 0:99222c303e8f | 54 | return char_num; |
dkato | 0:99222c303e8f | 55 | } |
dkato | 0:99222c303e8f | 56 | |
dkato | 2:d0bc8c2974e0 | 57 | bool AsciiFont::DrawChar(char c, int x, int y, uint32_t const colour, int font_size) { |
dkato | 0:99222c303e8f | 58 | int idx_base; |
dkato | 0:99222c303e8f | 59 | int idx_y = 0; |
dkato | 0:99222c303e8f | 60 | int wk_idx, i, j ,k, fw, fh; |
dkato | 0:99222c303e8f | 61 | char * p_pattern; |
dkato | 0:99222c303e8f | 62 | uint8_t mask = 0x80; |
dkato | 0:99222c303e8f | 63 | uint32_t wk_colour; |
dkato | 0:99222c303e8f | 64 | |
dkato | 0:99222c303e8f | 65 | if (font_size <= 0) { |
dkato | 0:99222c303e8f | 66 | return false; |
dkato | 0:99222c303e8f | 67 | } |
dkato | 2:d0bc8c2974e0 | 68 | if ((x + (CHAR_PIX_WIDTH * font_size)) > max_width) { |
dkato | 0:99222c303e8f | 69 | return false; |
dkato | 0:99222c303e8f | 70 | } |
dkato | 2:d0bc8c2974e0 | 71 | if ((y + (CHAR_PIX_HEIGHT * font_size)) > max_height) { |
dkato | 0:99222c303e8f | 72 | return false; |
dkato | 0:99222c303e8f | 73 | } |
dkato | 0:99222c303e8f | 74 | |
dkato | 0:99222c303e8f | 75 | if ((c >= 0x20) && (c <= 0x7e)) { |
dkato | 1:fc1b3db025d6 | 76 | p_pattern = (char *)&g_ascii_table[c - 0x20][0]; |
dkato | 0:99222c303e8f | 77 | } else { |
dkato | 1:fc1b3db025d6 | 78 | p_pattern = (char *)&g_ascii_table[10][0]; /* '*' */ |
dkato | 0:99222c303e8f | 79 | } |
dkato | 0:99222c303e8f | 80 | idx_base = (x * pixel_num) + (buf_stride * y); |
dkato | 0:99222c303e8f | 81 | |
dkato | 0:99222c303e8f | 82 | /* Drawing */ |
dkato | 2:d0bc8c2974e0 | 83 | for (i = 0; i < CHAR_PIX_HEIGHT; i++) { |
dkato | 0:99222c303e8f | 84 | for (fh = 0; fh < font_size; fh++) { |
dkato | 0:99222c303e8f | 85 | wk_idx = idx_base + (buf_stride * idx_y); |
dkato | 2:d0bc8c2974e0 | 86 | for (j = 0; j < CHAR_PIX_WIDTH; j++) { |
dkato | 0:99222c303e8f | 87 | if (p_pattern[j] & mask) { |
dkato | 0:99222c303e8f | 88 | wk_colour = colour; |
dkato | 0:99222c303e8f | 89 | } else { |
dkato | 0:99222c303e8f | 90 | wk_colour = background_colour; |
dkato | 0:99222c303e8f | 91 | } |
dkato | 0:99222c303e8f | 92 | for (fw = 0; fw < font_size; fw++) { |
dkato | 0:99222c303e8f | 93 | for (k = (pixel_num - 1); k >= 0; k--) { |
dkato | 0:99222c303e8f | 94 | p_text_field[wk_idx++] = (uint8_t)(wk_colour >> (8 * k)); |
dkato | 0:99222c303e8f | 95 | } |
dkato | 0:99222c303e8f | 96 | } |
dkato | 0:99222c303e8f | 97 | } |
dkato | 0:99222c303e8f | 98 | idx_y++; |
dkato | 0:99222c303e8f | 99 | } |
dkato | 0:99222c303e8f | 100 | mask = (uint8_t)(mask >> 1); |
dkato | 0:99222c303e8f | 101 | } |
dkato | 0:99222c303e8f | 102 | return true; |
dkato | 0:99222c303e8f | 103 | } |
dkato | 5:1eaa4942db53 | 104 |