AsciiFont.cpp

00001 #include "mbed.h"
00002 #include "AsciiFont.h"
00003 #include "ascii.h"
00004 
00005 AsciiFont::AsciiFont(uint8_t * p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour) : 
00006     p_text_field(p_buf), max_width(width), max_height(height), buf_stride(stride), pixel_num(byte_per_pixel), background_colour(colour) {
00007     
00008 }
00009 
00010 void AsciiFont::Erase() {
00011     Erase(background_colour, 0, 0, max_width, max_height);
00012 }
00013 
00014 void AsciiFont::Erase(uint32_t const colour) {
00015     Erase(colour, 0, 0, max_width, max_height);
00016 }
00017 
00018 void AsciiFont::Erase(uint32_t const colour, int x, int y, int width, int height) {
00019     int idx_base;
00020     int wk_idx, i, j ,k;
00021 
00022     background_colour = colour;
00023     idx_base = (x * pixel_num) + (buf_stride * y);
00024     for (i = 0; i < height; i++) {
00025         wk_idx = idx_base + (buf_stride * i);
00026         for (j = 0; j < width; j++) {
00027             for (k = (pixel_num - 1); k >= 0; k--) {
00028                 p_text_field[wk_idx++] = (uint8_t)(background_colour >> (8 * k));
00029             }
00030         }
00031     }
00032 }
00033 
00034 int AsciiFont::DrawStr(char * str, int x, int y, uint32_t const colour, int font_size, uint16_t const max_char_num) {
00035     int char_num = 0;
00036 
00037     if ((str == NULL) || (font_size <= 0)) {
00038         return 0;
00039     }
00040     while ((*str != '\0') && (char_num < max_char_num)) {
00041         if (DrawChar(*str, x, y, colour, font_size) == false) {
00042             break;
00043         }
00044         str++;
00045         x += CHAR_PIX_WIDTH * font_size;
00046         char_num++;
00047     }
00048     return char_num;
00049 }
00050 
00051 bool AsciiFont::DrawChar(char c, int x, int y, uint32_t const colour, int font_size) {
00052     int idx_base;
00053     int idx_y = 0;
00054     int wk_idx, i, j ,k, fw, fh;
00055     char * p_pattern;
00056     uint8_t mask = 0x80;
00057     uint32_t wk_colour;
00058 
00059     if (font_size <= 0) {
00060         return false;
00061     }
00062     if ((x + (CHAR_PIX_WIDTH * font_size)) > max_width) {
00063         return false;
00064     }
00065     if ((y + (CHAR_PIX_HEIGHT * font_size)) > max_height) {
00066         return false;
00067     }
00068 
00069     if ((c >= 0x20) && (c <= 0x7e)) {
00070         p_pattern = (char *)&g_ascii_table[c - 0x20][0];
00071     } else {
00072         p_pattern = (char *)&g_ascii_table[10][0]; /* '*' */
00073     }
00074     idx_base = (x * pixel_num) + (buf_stride * y);
00075 
00076     /* Drawing */
00077     for (i = 0; i < CHAR_PIX_HEIGHT; i++) {
00078         for (fh = 0; fh < font_size; fh++) {
00079             wk_idx = idx_base + (buf_stride * idx_y);
00080             for (j = 0; j < CHAR_PIX_WIDTH; j++) {
00081                 if (p_pattern[j] & mask) {
00082                     wk_colour = colour;
00083                 } else {
00084                     wk_colour = background_colour;
00085                 }
00086                 for (fw = 0; fw < font_size; fw++) {
00087                     for (k = (pixel_num - 1); k >= 0; k--) {
00088                         p_text_field[wk_idx++] = (uint8_t)(wk_colour >> (8 * k));
00089                     }
00090                 }
00091             }
00092             idx_y++;
00093         }
00094         mask = (uint8_t)(mask >> 1);
00095     }
00096     return true;
00097 }