freetype的交叉编译及在嵌入式linux上的简单使用及改变字体背景和颜色

int main()
{
	FT_Library	library;
	FT_Face		face;
	FT_Error	error;
	FT_UInt		charIdx;
	wchar_t		wch = 'a';
	char*		buffer;		// 用户申请的显示区域空间
	int			startX, startY;	// 字符图像开始装入的位置
 
	// 1. 初始化freetype2库
	error = FT_Init_FreeType(&library);
 
	// 2. 创建一个face
	error = FT_New_Face(library, "C:\\windows\\font\\SURSONG.TTF", 0, &face);
 
	// 3. 设置字体尺寸
	error = FT_Set_Char_Size(face, 16*64, 16*64, 96, 96);
 
	// 4. 获取字符图像索引
	charIdx = FT_Get_Char_Index(face, wch);
 
	// 5. 加载字符图像
	FT_Load_Glyph(face, charIdx, FT_LOAD_DEFAULT);
	if (face->glyph->format == FT_GLYPH_FORMAT_OUTLINE)
	{
		FT_Outline_Embolden(&(face->glyph->outline), 16);	// 加粗轮廓线
	}
 
	// 6. 获取字符位图
	if (face->glyph->format != FT_GLYPH_FORMAT_BITMAP)
	{
		FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
	}
 
	// 7. 拷贝字符位图到用户的buffer中(用户私人函数)
	// 注意左边的计算方法
	ft2CopyBitmapToBuf(buffer, startX+face->glyph->bitmap_left,
		startY+face->size->metrics.ascender/64-face->glyph->bitmap_top,
		face->glyph->bitmap);
	startX += face->glyph->advance.x/64;
}

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <signal.h>
#include <sys/resource.h>

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <string.h>
#include <linux/fb.h>

#include <stdio.h>
#include <wchar.h>
#include <math.h>
#include <ft2build.h>
#include FT_FREETYPE_H
//#include FT_GLYPH_H

int fd_fb;
struct fb_var_screeninfo var;
struct fb_fix_screeninfo fix;
int screen_size;
unsigned char *fbmem;
unsigned int line_width;
unsigned int pixel_width;

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 r,g,b;
	
	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:
		{
			r = (color>>16) & 0x1f;
			g = (color>>8) & 0x3f;
			b = (color>>0) & 0x1f;
			color = (r<<11) | (g<<5) | (b);
			*pen_16 = color;		
			break;
		}
		case 32:
		{
			*pen_32 = color;
			break;
		}
		default:
		{
			printf("can't support %dbpp\r\n",var.bits_per_pixel);
			break;
		}
	}
}


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 >= 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 init_fb0(void){
	fd_fb = open("/dev/fb0",O_RDWR);
	if(fd_fb < 0)
	{
		printf("can't open /dev/fb0\r\n");
		return -1;
	}
	
	if(ioctl(fd_fb,FBIOGET_VSCREENINFO,&var))	
	{
		printf("can't get var\r\n");
		return -1;
	}	
	if(ioctl(fd_fb,FBIOGET_FSCREENINFO,&fix))
	{
		printf("can't get fix\r\n");
		return -1;	
	}	
	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\r\n");
		return -1;
	}
	pixel_width = var.bits_per_pixel / 8;
	line_width = var.xres * pixel_width;

	memset(fbmem,0xffffff,screen_size);
	printf("init fb0 ok\n");
	printf("fb_var_info:%dx%d, %dbpp\n", var.xres, var.yres, var.bits_per_pixel);
	return 0;
}

int main(int argv, char **argc)
{
	FT_Library	  library;
	FT_Face 	  face;
	FT_Vector	  pen;	
	wchar_t 	 *new_str = L"我爱你中国1234567890";
	FT_GlyphSlot  slot;
	double        angle;  
	FT_Matrix     matrix;
	int err;
	int n;
	
	if(argv != 2)
	{
		printf("Usage : %s <font_file>\r\n",argc[0]);
		return -1;
	}
	
	err = init_fb0();
	if(err != 0){
		printf("init fb0 error\n"); 
		return -1;
	}

	err = FT_Init_FreeType(&library);			   	
	err = FT_New_Face(library, argc[1], 0, &face );	
	FT_Set_Pixel_Sizes(face,32,0);

	slot = face->glyph;


	pen.x = var.xres / 2;
	pen.x *= 64;
	pen.y = var.yres / 2;
	pen.y *= 64;
	
	angle = ( 0.0 / 360 ) * 3.14159 * 2;	 

	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 );

	for(n = 0;n < wcslen(new_str);n++)
	{
	    FT_Set_Transform(face,&matrix, &pen);
	    err = FT_Load_Char(face, new_str[n],FT_LOAD_RENDER);
		if(err)
		{
			printf("FT load char err\r\n");
			return -1;
		}		
		draw_bitmap(&slot->bitmap,slot->bitmap_left,var.yres - slot->bitmap_top);
		pen.x += 64*32;
		//pen.y += 64*32;
	}	

	return 0;
}

########################################
#makefile
########################################
#****************************************************************************
# Cross complie path
#****************************************************************************
# CHAIN_ROOT=/home/yang/imax283/ctools/gcc-4.4.4-glibc-2.11.1-multilib-1.0/arm-fsl-linux-gnueabi/bin

# CROSS_COMPILE=$(CHAIN_ROOT)/arm-none-linux-gnueabi-

CHAIN_ROOT= /home/yang/b503/ctools/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin
CROSS_COMPILE=$(CHAIN_ROOT)/arm-linux-gnueabihf-

#CROSS_COMPILE = 

CC     := $(CROSS_COMPILE)gcc
CXX    := $(CROSS_COMPILE)g++
AS     := $(CROSS_COMPILE)as
AR     := $(CROSS_COMPILE)ar 
LD     := $(CROSS_COMPILE)ld
RANLIB := $(CROSS_COMPILE)ranlib
OBJDUMP:= $(CROSS_COMPILE)objdump
OBJCOPY:= $(CROSS_COMPILE)objcopy
STRIP  := $(CROSS_COMPILE)strip

#±àÒëÖ¸¶¨×ÓĿ¼
SUBDIRS := 

define make_subdir
 @ for subdir in $(SUBDIRS) ; do \
 ( cd $$subdir && make $1) \
 done;
endef

#output
BINARY  := test
OBJ_DIR := 

#CFLAGS=   -I./GUI_X -I./GUI/Core -I./GUI/WM -I./GUI/Widget
CFLAGS=  -I./freetype/include/freetype2


LDSCRIPT=  -lfreetype -lm
LDFLAGS= -L./freetype/lib 

# SRC_C=$(shell find . -name "*.c")
# OBJ_C=$(patsubst %.c, %.o, $(SRC_C))
# SRCS := $(SRC_C) $(SRC_C)
# OBJS := $(OBJ_C) 

SRC  = $(wildcard *.c)
DIR  = $(notdir $(SRC))
OBJS = $(patsubst %.c,$(OBJ_DIR)%.o,$(DIR))
#OBJS=  testdb.o
#CFLAGS=-std=c99
#@echo Building lib...
#$(call make_subdir)
.PHONY: clean lib
all:  prebuild  $(BINARY)

prebuild:
	@echo Building app...

$(BINARY) : $(OBJS)
	@echo Generating ...
	$(CC) -o $(BINARY) $(OBJS) $(LDFLAGS) $(LDSCRIPT) 
	@echo OK!

$(OBJ_DIR)%.o : %.c
	$(CC) -c $(CFLAGS) $< -o  $@
	
lib:
	@echo Building lib...
	$(call make_subdir)
	
clean:
	rm -f $(OBJ_DIR)*.o
	find . -name "*.[od]" |xargs rm
	@echo Removed!