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交叉编译freetype2(带harfbuzz)
ubuntu16.04
arm-linux-gnueabihf-gcc
freetype 2.9
harfbuzz 1.9
freetype:https://download.savannah.gnu.org/releases/freetype/
harfbuzz:https://github.com/harfbuzz/harfbuzz
交叉编译
freetype和harfbuzz相互依赖，之前试过先编译freetype在编译harfbuzz，虽然编译成功但是编译链接应用的时候提示未定义函数，所以我把编译顺序调换过来先编译harfbuzz在编译freetype，这样就不存在问题了。
所以第一步先编译harfbuzz不带freetype
#harfbuzz --enable-static编译静态库
./configure --host=arm-linux-gnueabihf --prefix=/home/wyy/Develop/freetype/harfbuzz-master/install --with-freetype=yes --enable-static=yes --enable-shared=yes
make -j4
make install编译freetype链接到harfbuzz (不带freetype)
#freetype 默认会生成动态库和静态库
./configure --host=arm-linux-gnueabihf --prefix=/home/wyy/Develop/freetype/freetype-2.9/install --with-harfbuzz=yes --enable-shared=yes --enable-static=yes HARFBUZZ_CFLAGS='-I/home/wyy/Develop/freetype/harfbuzz-master/install/include/harfbuzz' HARFBUZZ_LIBS='-L/home/wyy/Develop/freetype/harfbuzz-master/install/lib -harfbuzz -harfbuzz-subset'
make -j4
make install最后编译带freetype的harfbuzz库
#harfbuzz --enable-static编译静态库
./configure --host=arm-linux-gnueabihf --prefix=/home/wyy/Develop/freetype/harfbuzz-master/install --with-freetype=yes --enable-static=yes --enable-shared=yes FREETYPE_CFLAGS=-I/home/wyy/Develop/freetype/freetype-2.9/install/include/freetype2 FREETYPE_LIBS='-L/home/wyy/Develop/freetype/freetype-2.9/install/lib -lfreetype'
make -j4
make install编程
编程实例
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/fb.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <wchar.h>
#include <stdlib.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
int fd_fb;
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
int screen_size;
unsigned char *fbmem;
unsigned int line_width;
unsigned int pixel_width;
int number;
unsigned int color_array[6]={
0x0000FF , /* blue */
0x00FF00 , /* green */
0x00FFFF ,/* blackish green */
0xFF0000 ,/* red */
0xFF00FF ,/* carmine */
0xFFFF00 ,/* yellow */
};
/* color : 0x00RRGGBB */
void lcd_put_pixel(int x, int y, unsigned int color)
{
unsigned char *pen_8 = fbmem+y*line_width+x*pixel_width;
unsigned short *pen_16;
unsigned int *pen_32;
unsigned int red, green, blue;
pen_16 = (unsigned short *)pen_8;
pen_32 = (unsigned int *)pen_8;
switch (var.bits_per_pixel)
{
case 8:
{
*pen_8 = color;
break;
}
case 16:
{
/* 565 */
//red = (color >> 16) & 0xff;
//green = (color >> 8) & 0xff;
//blue = (color >> 0) & 0xff;
//color = ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3);
if(color!=0) /* 这里非常重要，有些轮廓信息是0，就是字体空白区域*/
{
red = (color_array[number] >> 16) & 0xff;
green = (color_array[number] >> 8) & 0xff;
blue = (color_array[number] >> 0) & 0xff;
color = ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3);
}
*pen_16 = color;
break;
}
case 32:
{
/*去除字体问题中的黑色背景,如果需要不同背景可以通过在这里设置相应的颜色。*/
if(color == 0) return;
*pen_32 = color;
break;
}
default:
{
printf("can't surport %dbpp\n", var.bits_per_pixel);
break;
}
}
}
/* 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;
//printf("x = %d, y = %d\n", x, y);
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 >= var.xres || j >= var.yres )
continue;
//image[j][i] |= bitmap->buffer[q * bitmap->width + p];
lcd_put_pixel(i, j, bitmap->buffer[q * bitmap->width + p]);
}
}
}
int main(int argc, char **argv)
{
wchar_t *wstr1 = L"网络人VS灰鸽子";
FT_Library library;
FT_Face face;
int error;
FT_Vector pen;
FT_GlyphSlot slot;
int i;
int font_size;
if (argc != 4)
{
printf("Usage : %s <font_file> <font_size> <color number0~5>\n", argv[0]);
return -1;
}
font_size=atol(argv[2]);
number =atol(argv[3]);
fd_fb = open("/dev/fb0", O_RDWR);
if (fd_fb < 0)
{
printf("can't open /dev/fb0\n");
return -1;
}
if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &var))
{
printf("can't get var\n");
return -1;
}
if (ioctl(fd_fb, FBIOGET_FSCREENINFO, &fix))
{
printf("can't get fix\n");
return -1;
}
line_width = var.xres * var.bits_per_pixel / 8;
pixel_width = var.bits_per_pixel / 8;
screen_size = var.xres * var.yres * var.bits_per_pixel / 8;
fbmem = (unsigned char *)mmap(NULL , screen_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd_fb, 0);
if (fbmem == (unsigned char *)-1)
{
printf("can't mmap\n");
return -1;
}
/* 清屏: 全部设为黑色 */
memset(fbmem, 130, screen_size);
/* 显示矢量字体 */
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 */
slot = face->glyph;
FT_Set_Pixel_Sizes(face,24, 0);
/* 确定座标:
* lcd_x = 0
* lcd_y = font_size
* 笛卡尔座标系:
* x = lcd_x = 0
* y = var.yres - lcd_y = var.yres - 24
*/
pen.x = 0 * 64;
pen.y = (var.yres - 24) * 64;
for (i = 0; i < wcslen(wstr1); i++)
{
/* set transformation */
FT_Set_Transform( face, 0, &pen);
/* load glyph image into the slot (erase previous one) */
error = FT_Load_Char( face, wstr1[i], FT_LOAD_RENDER );
if (error)
{
printf("FT_Load_Char error\n");
return -1;
}
draw_bitmap( &slot->bitmap,
slot->bitmap_left,
var.yres - slot->bitmap_top);
/* increment pen position */
pen.x += slot->advance.x;
//pen.y += slot->advance.y;
}
return 0;
}
编译命令
arm-linux-gnueabihf-gcc show_lines.c -o show_lines -L/home/wyy/Develop/freetype/freetype-2.9/install/lib -lfreetype -L/home/wyy/Develop/freetype/harfbuzz-master/install/lib -lharfbuzz -lharfbuzz-subset -lpthread -lm -I/home/wyy/Develop/freetype/freetype-2.9/install/include/freetype2 -I/home/wyy/Develop/freetype/harfbuzz-master/install/include/harfbuzz -I/home/wyy/Develop/freetype/harfbuzz-master/src -static