freetype使用文泉驿显示及保存图片
https://blog.csdn.net/zb774095236/article/details/94016538
https://blog.csdn.net/qq_32693119/article/details/79961312
gcc example.c -o example -lfreetype -lm
1.使用开源库文泉驿字库
./example wqy.ttc ni
https://blog.csdn.net/qq_22655017/article/details/90034431
例子支持中文
/* example1.c */
/* */
/* This small program shows how to print a rotated string with the */
/* FreeType 2 library. */
#include
#include
#include
#include
#include
#include
#include FT_FREETYPE_H
#define USE_ICONV
#ifdef USE_ICONV
#include "iconv.h"
#endif
#define WIDTH 120
#define HEIGHT 30
/* origin is the upper left corner */
unsigned char image[HEIGHT][WIDTH];
/* Replace this function with something useful. */
void draw_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];
}
}
}
void show_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' );
}
}
/**
* 把缓冲区中的数据保存为灰度图像文件
*/
#if 0
int store_image(unsigned char *buffer, const char *image_name)
{
int i, j, ret = 0;
// 创建新的位图对象
FIBITMAP *bitmap = FreeImage_Allocate(g_width, g_height, 32);
if (bitmap == NULL) {
printf("alloc bitmap fail\n");
return EXIT_FAILURE;
}
uint8_t *bits = FreeImage_GetBits(bitmap);
for (i = 0; i < g_width * g_height; i++) {
for (j = 0; j < 3; j++)
{
bits[i*4+j] = buffer[i];
}
bits[i*4+3]=255;
}
FreeImage_Save(g_format, bitmap, image_name);
FreeImage_Unload(bitmap);
return ret;
}
#endif
#ifdef USE_ICONV
int code_convert(char *from_charset,char *to_charset,const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
iconv_t cd;
int rc;
char **pin = (char**)&inbuf;
char **pout = &outbuf;
cd = iconv_open(to_charset,from_charset);
if(cd == (iconv_t)-1) {
perror("iconv_open");
}
if (cd==0) {
perror("cd is zero");
return -1;
}
memset(outbuf,0,outlen);
if(iconv(cd,pin,&inlen,pout,&outlen)==-1){
perror("iconv");
return -1;
}
iconv_close(cd);
return 0;
}
int u2g(char *inbuf,int inlen,char *outbuf,int outlen)
{
return code_convert("utf-8","gbk",inbuf,inlen,outbuf,outlen);
}
int KM_GBK2UTF(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("gb18030","utf-8",inbuf,inlen,outbuf,outlen);
}
int KM_UTF2GBK(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("utf-8","gbk",inbuf,inlen,outbuf,outlen);
}
int KM_UTF2UNICODE(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("utf-8","UCS-4LE",inbuf,inlen,outbuf,outlen);
//return code_convert("utf-8","UCS-2BE",inbuf,inlen,outbuf,outlen);
}
#endif
//zh_CN.utf8
int ToWchar(char* src, wchar_t* dest, int len)
{
int w_size = 0;
char *p;
if (src == NULL) {
dest = NULL;
return 0;
}
// 根据环境变量设置locale
//p = setlocale(LC_CTYPE, "zh_CN.utf8");
p = setlocale(LC_CTYPE, "");
if(p == NULL) {
//fprintf(stderr, "can't set the locale\n");
perror("set fail");
return -1;
}
printf("local:%s\n", p);
// 得到转化为需要的宽字符大小
w_size = mbstowcs(NULL, src, 0) + 1;
// w_size = 0 说明mbstowcs返回值为-1。即在运行过程中遇到了非法字符(很有可能使locale
// 没有设置正确)
if (w_size == 0) {
printf("not get utf8 here\n");
dest = NULL;
return -1;
}
if(len < w_size) {
printf("dest size is not enough\n");
return -1;
}
int ret = mbstowcs(dest, src, strlen(src)+1);
if (ret <= 0) {
return -1;
}
return w_size;
}
#define WCHAR_SIZE 200
int main(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;
int ret;
int i;
//gcc example.c -o example -lfreetype -lm -finput-charset=GBK -fexec-charset=UTF-8
//加入-finput-charset=GBK -fexec-charset=UTF-8
// wide char string
//wchar_t *chinese_str = L"你好";
wchar_t *chinese_str;
wchar_t buf_input[WCHAR_SIZE] = {0};
unsigned char output[200] = {0};
char *tmp_p;
//char input[200] = {0xe4,0xbd,0xa0};
char input[200] = {0};
int in_len = 0;
int out_len = 0;
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 */
strcpy(input, argv[2]);
//sprintf(input, "%s", "严");
#ifndef USE_ICONV
ret = ToWchar(input, buf_input, WCHAR_SIZE);
if(ret <= 0) {
printf("char to wchar fail\n");
//return 0;
}
#else
in_len = strlen(input);
out_len = sizeof(output);
ret = KM_UTF2UNICODE(input, in_len, output, out_len);
//ret = utf8_to_unicode(input, &in_len, output, &out_len);
if(ret != 0) {
printf("gbk to utf8 fail\n");
strcpy(output, input);
}
//0x60,0x4f,0x0,0x0,0x7d,0x59,0x0,0x0
//e4, bd, a0, e5, a5, bd
#if 0
for(i = 0; i < out_len; i++) {
buf_input[i] = output[i*2] | output[i*2+1]<<8;
printf("input:0x%x, 0x%x, 0x%x, 0x%x\n", input[i], output[i], output[i*2+1], buf_input[i*2]);
}
#else
memcpy(buf_input, output, out_len);
#endif
#endif
chinese_str = buf_input;
//chinese_str = (wchar_t *)output;
//num_chars = strlen( text );
num_chars = wcslen(chinese_str);
printf("input<%s>, out<%s>\n", input, output);
tmp_p = (char*)buf_input;
printf("wchar is <");
for(i = 0; i < num_chars*4; i++) {
printf("0x%x", tmp_p[i]);
if(i != (num_chars*4 - 1)) {
printf(",");
}
}
printf(">\n");
printf("num_chars:%d\n", num_chars);
angle = ( 0.0 / 360 ) * 3.14159 * 2; /* use 0 degrees 旋转 */
target_height = HEIGHT;
error = FT_Init_FreeType( &library ); /* initialize library */
/* error handling omitted */
error = FT_New_Face( library, filename, 0, &face );/* create face object */
/* error handling omitted */
/* use 30dot at 72dpi */
//字符的像素为: 30*64* (1/64) * (1/72)*72
error = FT_Set_Char_Size( face, 30 * 64, 0, 72, 0 ); /* set character size */
/* error handling omitted */
//error = FT_Set_Pixel_Sizes( face, 0,24);
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 (40,0) relative to the upper left corner */
pen.x = 0 * 64;
//pen.y = ( target_height - 40 ) * 64;
pen.y = 4*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 );
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;
}
show_image();
FT_Done_Face ( face );
FT_Done_FreeType( library );
return 0;
}
/* EOF */
gcc example.c -o example -lfreetype -lm
gcc example.c -o example -lfreetype -lm -finput-charset=GBK -fexec-charset=UTF-8
gcc example.c -o example -lfreetype -lm -liconv
arm-linux-gnueabi-gcc example.c -o example -lfreetype -lm -liconv -I./ -L./arm -Wl,-rpath-link=./arm
需要准备好libfreetype.so,libiconv.so,libz.so.1
2.使用FreeImage图形库和freetype显示字符及保存图片
/* example1.c */
/* */
/* This small program shows how to print a rotated string with the */
/* FreeType 2 library. */
#include
#include
#include
#include
#include
#include
#include FT_FREETYPE_H
#include "FreeImage.h"
#define USE_ICONV
#ifdef USE_ICONV
#include "iconv.h"
#endif
#define WIDTH 120
#define HEIGHT 30
//#define WIDTH 400
//#define HEIGHT 300
/* origin is the upper left corner */
unsigned char image[HEIGHT][WIDTH];
/* Replace this function with something useful. */
void draw_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++ )
{
#if 0
//reverse height
//for ( j = y, q = 0; j < y_max; j++, q++ )
#else
for ( j = y_max - 1, q = 0; j >= y; j--, q++ )
#endif
{
if ( i < 0 || j < 0 || i >= WIDTH || j >= HEIGHT ) {
continue;
}
image[j][i] |= bitmap->buffer[q * bitmap->width + p];
}
}
}
void show_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' );
}
}
long get_cur_ms(void)
{
long t = 0;
struct timeval time;
gettimeofday(&time, NULL);
t = ((long)time.tv_sec)*1000 + (long)time.tv_usec/1000;
return t;
}
/**
* 把缓冲区中的数据保存为灰度图像文件
*/
int g_width = 0;
int g_height = 0;
FREE_IMAGE_FORMAT g_format = FIF_PNG;
int store_image(unsigned char *buffer, const char *image_name)
{
int i, j, ret = 0;
g_width = WIDTH;
g_height = HEIGHT;
// 创建新的位图对象
FIBITMAP *bitmap = FreeImage_Allocate(g_width, g_height, 32, 8, 8, 8);
if (bitmap == NULL) {
printf("alloc bitmap fail\n");
return EXIT_FAILURE;
}
unsigned char *bits = FreeImage_GetBits(bitmap);
for (i = 0; i < g_width * g_height; i++) {
for (j = 0; j < 3; j++)
{
bits[i*4+j] = buffer[i];
}
bits[i*4+3]=255;
}
FreeImage_Save(g_format, bitmap, image_name, PNG_DEFAULT);
//FreeImage_Save(g_format, bitmap, image_name, PNG_DEFAULT);
FreeImage_Unload(bitmap);
return ret;
}
#ifdef USE_ICONV
int code_convert(char *from_charset,char *to_charset,const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
iconv_t cd;
int rc;
char **pin = (char**)&inbuf;
char **pout = &outbuf;
cd = iconv_open(to_charset,from_charset);
if(cd == (iconv_t)-1) {
perror("iconv_open");
}
if (cd==0) {
perror("cd is zero");
return -1;
}
memset(outbuf,0,outlen);
if(iconv(cd,pin,&inlen,pout,&outlen)==-1){
perror("iconv");
return -1;
}
iconv_close(cd);
return 0;
}
int u2g(char *inbuf,int inlen,char *outbuf,int outlen)
{
return code_convert("utf-8","gbk",inbuf,inlen,outbuf,outlen);
}
int KM_GBK2UTF(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("gb18030","utf-8",inbuf,inlen,outbuf,outlen);
}
int KM_UTF2GBK(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("utf-8","gbk",inbuf,inlen,outbuf,outlen);
}
int KM_UTF2UNICODE(const char *inbuf,size_t inlen,char *outbuf,size_t outlen)
{
return code_convert("utf-8","UCS-4LE",inbuf,inlen,outbuf,outlen);
//return code_convert("utf-8","UCS-2BE",inbuf,inlen,outbuf,outlen);
}
#endif
//zh_CN.utf8
int ToWchar(char* src, wchar_t* dest, int len)
{
int w_size = 0;
char *p;
if (src == NULL) {
dest = NULL;
return 0;
}
// 根据环境变量设置locale
//p = setlocale(LC_CTYPE, "zh_CN.utf8");
p = setlocale(LC_CTYPE, "");
if(p == NULL) {
//fprintf(stderr, "can't set the locale\n");
perror("set fail");
return -1;
}
printf("local:%s\n", p);
// 得到转化为需要的宽字符大小
w_size = mbstowcs(NULL, src, 0) + 1;
// w_size = 0 说明mbstowcs返回值为-1。即在运行过程中遇到了非法字符(很有可能使locale
// 没有设置正确)
if (w_size == 0) {
printf("not get utf8 here\n");
dest = NULL;
return -1;
}
if(len < w_size) {
printf("dest size is not enough\n");
return -1;
}
int ret = mbstowcs(dest, src, strlen(src)+1);
if (ret <= 0) {
return -1;
}
return w_size;
}
#define WCHAR_SIZE 200
int main(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;
int ret;
int i;
long t;
//gcc example.c -o example -lfreetype -lm -finput-charset=GBK -fexec-charset=UTF-8
//加入-finput-charset=GBK -fexec-charset=UTF-8
// wide char string
//wchar_t *chinese_str = L"你好";
wchar_t *chinese_str;
wchar_t buf_input[WCHAR_SIZE] = {0};
unsigned char output[200] = {0};
char *tmp_p;
//char input[200] = {0xe4,0xbd,0xa0};
char input[200] = {0};
int in_len = 0;
int out_len = 0;
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 */
strcpy(input, argv[2]);
//sprintf(input, "%s", "严");
#ifndef USE_ICONV
ret = ToWchar(input, buf_input, WCHAR_SIZE);
if(ret <= 0) {
printf("char to wchar fail\n");
//return 0;
}
#else
in_len = strlen(input);
out_len = sizeof(output);
t = get_cur_ms();
ret = KM_UTF2UNICODE(input, in_len, output, out_len);
//ret = utf8_to_unicode(input, &in_len, output, &out_len);
if(ret != 0) {
printf("gbk to utf8 fail\n");
strcpy(output, input);
}
//0x60,0x4f,0x0,0x0,0x7d,0x59,0x0,0x0
//e4, bd, a0, e5, a5, bd
#if 0
for(i = 0; i < out_len; i++) {
buf_input[i] = output[i*2] | output[i*2+1]<<8;
printf("input:0x%x, 0x%x, 0x%x, 0x%x\n", input[i], output[i], output[i*2+1], buf_input[i*2]);
}
#else
memcpy(buf_input, output, out_len);
#endif
#endif
chinese_str = buf_input;
//chinese_str = (wchar_t *)output;
//num_chars = strlen( text );
num_chars = wcslen(chinese_str);
printf("input<%s>, out<%s>\n", input, output);
tmp_p = (char*)buf_input;
printf("wchar is <");
for(i = 0; i < num_chars*4; i++) {
printf("0x%x", tmp_p[i]);
if(i != (num_chars*4 - 1)) {
printf(",");
}
}
printf(">\n");
printf("num_chars:%d\n", num_chars);
printf("to wchar cost %dms\n", get_cur_ms() - t);
t = get_cur_ms();
angle = ( 0.0 / 360 ) * 3.14159 * 2; /* use 0 degrees 旋转 */
target_height = HEIGHT;
error = FT_Init_FreeType( &library ); /* initialize library */
/* error handling omitted */
error = FT_New_Face( library, filename, 0, &face );/* create face object */
/* error handling omitted */
/* use 30dot at 72dpi */
//字符的像素为: 30*64* (1/64) * (1/72)*72
error = FT_Set_Char_Size( face, 30 * 64, 0, 72, 0 ); /* set character size */
/* error handling omitted */
//error = FT_Set_Pixel_Sizes( face, 0,24);
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 (40,0) relative to the upper left corner */
pen.x = 0 * 64;
//pen.y = ( target_height - 40 ) * 64;
pen.y = 4*64;
//pen.y = 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 );
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;
}
printf("translate cost %dms\n", get_cur_ms() - t);
t = get_cur_ms();
show_image();
FT_Done_Face ( face );
FT_Done_FreeType( library );
printf("show_image cost %dms\n", get_cur_ms() - t);
t = get_cur_ms();
store_image((unsigned char*)image, "./tmp.png");
printf("store_image cost %dms\n", get_cur_ms() - t);
return 0;
}
/* EOF */
gcc example.c -o example -lfreetype -lm -liconv -lfreeimagelibfreeimge
安装
https://blog.csdn.net/jacke121/article/details/60139468?utm_source=blogxgwz5