font .c

#include <ft2build.h>#include FT_FREETYPE_H#include "common.h"static FT_Library library;static FT_Face face;/* default font */static char *fontfile = "mao.ttf";static int psize = 32;static u16_t s_font_utf8_to_unicode (const unsigned char *utf8, int *len){unsigned short unicode;unicode = utf8[0];if (unicode >= 0xF0){unicode = (unsigned short) (utf8[0] & 0x07) << 18;unicode |= (unsigned short) (utf8[1] & 0x3F) << 12;unicode |= (unsigned short) (utf8[2] & 0x3F) << 6;unicode |= (unsigned short) (utf8[3] & 0x3F);*len = 4;}else if (unicode >= 0xE0){unicode = (unsigned short) (utf8[0] & 0x0F) << 12;unicode |= (unsigned short) (utf8[1] & 0x3F) << 6;unicode |= (unsigned short) (utf8[2] & 0x3F);*len = 3;}else if (unicode >= 0xC0){unicode = (unsigned short) (utf8[0] & 0x1F) << 6;unicode |= (unsigned short) (utf8[1] & 0x3F);*len = 2;}else {*len = 1;}return unicode;}int init_ft (const char *file, int size){/* XXX: font size */if(size != 0)psize = size;/* XXX: font file */if (file != NULL)fontfile = (char *)file;if (FT_Init_FreeType (&library)    || FT_New_Face (library, fontfile, 0, &face)    || FT_Set_Pixel_Sizes (face, psize, 0)) {perror("Error initial font file");return 1;}return 0;}int display_font(const char *code,int *len,int x,int y,fb_info fb, u32_t color){unsigned int ucode;FT_UInt glyph_index;int row, pixel;ucode = s_font_utf8_to_unicode ((u8_t*)code, len);if ((glyph_index = FT_Get_Char_Index (face, ucode)) == 0)return 2;if (FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT))return 3;if (FT_Render_Glyph (face->glyph, FT_RENDER_MODE_MONO))return 4; y -= face->glyph->bitmap_top;for (row = 0; row < face->glyph->bitmap.rows; ++row,y++){/* FIXME: why?? *///for (pixel = 0; pixel < face->glyph->bitmap_left; ++pixel)//;            for (pixel = 0; pixel < face->glyph->bitmap.width; ++pixel){if (face->glyph->bitmap.buffer[row * face->glyph->bitmap.pitch + pixel / 8]    & (0xC0 >> (pixel % 8)))fb_pixel(fb, x+pixel, y, color);}}return 0;}/* display string */int display_string (const char * buf, int x, int y, fb_info fb_inf,u32_t color){int len;while (buf[0] != '\0') {if (display_font(buf,&len,x,y,fb_inf, color)) return 1;buf += len;x += psize;}return 0;}