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[操作系统]文件浏览器及数码相框


 

例子

#include <stdio.h>#include <string.h>#include <math.h>#include <ft2build.h>#include FT_FREETYPE_H#define WIDTH  80#define HEIGHT 80/* origin is the upper left corner */unsigned char image[HEIGHT][WIDTH];/* Replace this function with something useful. */voiddraw_bitmap( FT_Bitmap* bitmap,       FT_Int   x,       FT_Int   y){ FT_Int i, j, p, q; FT_Int x_max = x + bitmap->width; FT_Int y_max = y + bitmap->rows; for ( i = x, p = 0; i < x_max; i++, p++ ) {  for ( j = y, q = 0; j < y_max; j++, q++ )  {   if ( i < 0   || j < 0    ||      i >= WIDTH || j >= HEIGHT )    continue;   image[j][i] |= bitmap->buffer[q * bitmap->width + p];  } }}voidshow_image( void ){ int i, j; for ( i = 0; i < HEIGHT; i++ ) {  for ( j = 0; j < WIDTH; j++ )   putchar( image[i][j] == 0 ? ' '                : image[i][j] < 128 ? '+'                          : '*' );  putchar( '\n' ); }}intmain( int   argc,   char** argv ){ FT_Library  library; FT_Face    face; FT_GlyphSlot slot; FT_Matrix   matrix;         /* transformation matrix */ FT_Vector   pen;          /* untransformed origin */ FT_Error   error; char*     filename; char*     text; double    angle; int      target_height; int      n, num_chars; if ( argc != 3 ) {  fprintf ( stderr, "usage: %s font sample-text\n", argv[0] );  exit( 1 ); } filename   = argv[1];              /* first argument   */ text     = argv[2];              /* second argument  */ num_chars   = strlen( text ); angle     = ( 0.0 / 360 ) * 3.14159 * 2;   /* use 25 degrees   */ target_height = HEIGHT; error = FT_Init_FreeType( &library );       /* initialize library */ /* error handling omitted */ error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */ /* error handling omitted */#if 0 /* use 50pt at 100dpi */ error = FT_Set_Char_Size( face, 50 * 64, 0,              100, 0 );        /* set character size */  /* pixels = 50 /72 * 100 = 69 个像素点*/#else  FT_Set_Pixel_Sizes(face, 24, 0);#endif /* error handling omitted */ slot = face->glyph; /* set up matrix */ matrix.xx = (FT_Fixed)( cos( angle ) * 0x10000L ); matrix.xy = (FT_Fixed)(-sin( angle ) * 0x10000L ); matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L ); matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L ); /* the pen position in 26.6 cartesian space coordinates; */ /* start at (0,40) relative to the upper left corner */ pen.x = 0 * 64; pen.y = ( target_height - 40 ) * 64; for ( n = 0; n < num_chars; n++ ) {  /* set transformation */  FT_Set_Transform( face, &matrix, &pen );  /* load glyph image into the slot (erase previous one) */  error = FT_Load_Char( face, text[n], FT_LOAD_RENDER );  if ( error )   continue;         /* ignore errors */  /* now, draw to our target surface (convert position) */  draw_bitmap( &slot->bitmap,         slot->bitmap_left,         target_height - slot->bitmap_top );  /* increment pen position */  pen.x += slot->advance.x;  pen.y += slot->advance.y; } show_image(); FT_Done_Face  ( face ); FT_Done_FreeType( library ); return 0;}

 

1.编译free_type

配置  ./configure

编译   make

安装 sudo make install

 

gcc -o example1 example1.c

error: freetype/config/ftheader.h: No such file or directory
example1.c:12:10: error: #include expects "FILENAME" or <FILENAME>

指定头文件目录编译

gcc -o example1 example1.c  -I /usr/local/include/freetype2

 

报错缺库

example1.c:(.text+0x1ea): undefined reference to `FT_Init_FreeType'
example1.c:(.text+0x216): undefined reference to `FT_New_Face'
example1.c:(.text+0x236): undefined reference to `FT_Set_Pixel_Sizes'
example1.c:(.text+0x24d): undefined reference to `cos'
example1.c:(.text+0x285): undefined reference to `sin'
example1.c:(.text+0x2bd): undefined reference to `sin'
example1.c:(.text+0x2f5): undefined reference to `cos'
example1.c:(.text+0x360): undefined reference to `FT_Set_Transform'
example1.c:(.text+0x386): undefined reference to `FT_Load_Char'
example1.c:(.text+0x409): undefined reference to `FT_Done_Face'
example1.c:(.text+0x415): undefined reference to `FT_Done_FreeType'

 

example1.c:(.text+0x24d): undefined reference to `cos'
example1.c:(.text+0x285): undefined reference to `sin'
example1.c:(.text+0x2bd): undefined reference to `sin'
example1.c:(.text+0x2f5): undefined reference to `cos'

指定库编译freetype    gcc -o example1 example1.c  -I /usr/local/include/freetype2 –lfreetype

 

缺数学类定义

example1.c:(.text+0x24d): undefined reference to `cos'
example1.c:(.text+0x285): undefined reference to `sin'
example1.c:(.text+0x2bd): undefined reference to `sin'
example1.c:(.text+0x2f5): undefined reference to `cos'

 

加-lm为加数学类库意思   gcc -o example1 example1.c  -I /usr/local/include/freetype2 -lfreetype  -lm

 

执行exampe1  用宋体文件    显示abcfg 

./example1   ./simsun.ttc  abcfg

 

 

abcfg_thumb2

 

陈志朋uicode码为  48 96 D7 5F 67 0B

int chinese_str[] = {0x9648,0x5fd7,0x670b};

for ( n = 0; n < 4; n++ ) {  /* set transformation */  FT_Set_Transform( face, &matrix, &pen );  /* load glyph image into the slot (erase previous one) */  error = FT_Load_Char( face, chinese_str[n], FT_LOAD_RENDER );  if ( error )   continue;         /* ignore errors */  /* now, draw to our target surface (convert position) */  draw_bitmap( &slot->bitmap,         slot->bitmap_left,         target_height - slot->bitmap_top );  /* increment pen position */  pen.x += slot->advance.x;  pen.y += slot->advance.y; }

 

./example1   ./simsun.ttc   abc

 

_thumb7

 

无法直接使用“abc陈志朋a”

使用宽字符

添加头文件include<wchar.h>

#include <wchar.h>

  wchar_t * chinese_str = L"陈志朋~陈";
  unsigned int *p = (wchar_t *)chinese_str;

  int i = 0;

  printf("uicode: \n");
  for( i = 0; i < wcslen(chinese_str); i++)
  {
    printf("0x%x " , p[i]);
  }

  printf("\n");
  return 0;
 


85:27: error: converting to execution character set: Invalid or incomplete multibyte or wide character

 

代码格式为asii应转化为uicode码

gcc -finput-charset=GBK -fexec-charset=UTF-8 -o example1 example1.c  -I /usr/local/include/freetype2 -lfreetype  -lm

 

结果

uicode:
0x9648 0x5fd7 0x670b 0x7e 0x9648

 

打印出位置大小参数

_thumb3

 

添加头文件#include FT_GLYPH_H  

FT_BBox bbox;   FT_Glyph glyph;   // 将FT_GlyphSlot glyph转化为 FT_Glyph glyph;  error = FT_Get_Glyph( face->glyph, &glyph );  if(error)  {    printf("FT_Get_Glyph error \n");  }  /*从glyph中获取bbox*/  FT_Glyph_Get_CBox( glyph, FT_GLYPH_BBOX_TRUNCATE, &bbox );
  //汉字uicode码  printf("uicode: %x\n", chinese_str[n]);  //汉字位置原点  printf("origin.x /64 = %d , origin.y /64 = %d ", pen.x/64, pen.y/64);    //最小最大X,Y  printf("x_min = %d ,x_max = %d, y_min = %d, y_max = %d \n", bbox.xMin, bbox.xMax, bbox.yMin, bbox.yMax);  //X,Y偏移值  printf("slot.advance.x/64 = %d, slot.advance.y/64 = %d \n", slot->advance.x/64, slot->advance.y/64);

 

 

结果

uicode: 9648
origin.x /64 = 0 , origin.y /64 = 40 x_min = 2 ,x_max = 23, y_min = 37, y_max = 60
slot.advance.x/64 = 24, slot.advance.y/64 = 0
uicode: 5fd7
origin.x /64 = 24 , origin.y /64 = 40 x_min = 25 ,x_max = 47, y_min = 38, y_max = 60
slot.advance.x/64 = 24, slot.advance.y/64 = 0
uicode: 670b
origin.x /64 = 48 , origin.y /64 = 40 x_min = 48 ,x_max = 70, y_min = 37, y_max = 59
slot.advance.x/64 = 24, slot.advance.y/64 = 0
uicode: 7e
origin.x /64 = 72 , origin.y /64 = 40 x_min = 73 ,x_max = 84, y_min = 55, y_max = 60
slot.advance.x/64 = 12, slot.advance.y/64 = 0
uicode: 9648
origin.x /64 = 84 , origin.y /64 = 40 x_min = 86 ,x_max = 107, y_min = 37, y_max = 60
slot.advance.x/64 = 24, slot.advance.y/64 = 0

 

 

 

image_thumb4

 

 

3_thumb7