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[学习分享] 关于电子书阅读器的代码问题 [复制链接]

q1030965736

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电梯直达

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发表于 2013-01-10 13:26 |只看该作者 |倒序浏览

10可用积分

这个代码怎么弄成可以翻上一页或者可以显示中文

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/ipc.h>
#include <linux/fb.h>
#include <sys/types.h>
#include <stdlib.h>
#include "font_8x16.h"
//画好显示区域，x方向左右空一个字，y方向上下空一个字节
#define Start_x 16
#define Start_y 8
#define End_x (320 - 16)
#define End_y (240 - 8)
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
char *fbp = 0;
long screensize = 0;
long location = 0;
int r = 0;
unsigned int number;
int fk;
char buttom_status[6];
int next_page = 0;
unsigned int page[1000];
unsigned int count = 0;
int page_n;
//清屏
void Clean_screen()
{
memset(fbp, 0xf8, screensize);
}
void Draw_text16X16(long location_t,unsigned short color, const unsigned char ch[])
{
int i, j;
unsigned char mask, buffer;
for (i = 0; i < 16; i++)
{
mask = 0x80;
buffer = ch[i * 2];
location_t += finfo.line_length;
for (j = 0; j < 8; j++) {
if ((buffer & mask))
{
*(fbp +location_t + j * vinfo.bits_per_pixel / 8) = color;
*(fbp +location_t + j * vinfo.bits_per_pixel / 8 + 1) = color>>8;
}
mask = mask >> 1;
}
mask = 0x80;
buffer = ch[i * 2 + 1];
for (j = 0; j < 8; j++)
{
if ((buffer & mask))
{
*(fbp +location_t + (8 + j) * vinfo.bits_per_pixel / 8) = color;
*(fbp +location_t + (8 + j) * vinfo.bits_per_pixel / 8 + 1) = color>>8;
}
mask = mask >> 1;
}
}
}
void Draw_text16X8(long location_t,unsigned short color, const unsigned char ch[])
{
int i, j;
unsigned char mask, buffer;
for (i = 0; i < 16; i++)
{
mask = 0x80;
buffer = ch[i];
location_t += finfo.line_length;
for (j = 0; j < 8; j++)
{
if ((buffer & mask))
{
*(fbp +location_t + j * vinfo.bits_per_pixel / 8) = color;
*(fbp +location_t + j * vinfo.bits_per_pixel / 8 + 1) = color>>8;
}
mask = mask >> 1;
}
}
}
void Next_screen(long location_t, unsigned short color, unsigned char ch[], int Flag)
{
int ret;
while (1)
{
ret = read(fk, buttom_status, 6);
if (ret < 0)
{
printf("read buttom status err\n");
}
if (buttom_status[0] == '1')
{
next_page = 1;
}
if (next_page == 1)
{
next_page = 0;
//清屏
Clean_screen();
//重新定一屏的起始位置
location = location_t;
r = 0;
page[page_n] = count;
page_n += 1;
count = 0;
//打印汉字
if (Flag == 1)
Draw_text16X16(location, color, ch);
else if (Flag == 0)
Draw_text16X8(location, color, ch);
break;
}else
{
continue;
}
}
}
void Next_line(long location_t,int r_t)
{
location = location_t + 16 * r_t * finfo.line_length;
}
void Put_lcd_Hz(long location_t, unsigned short color, unsigned char ch[])
{
int Flag_Hz = 0; //汉字标志位，默认为字符非汉字
//计算字最右边的点有没有越界,判断位置需不需要换行
location += 16 * (vinfo.bits_per_pixel / 8);
//这个针对320x240的屏，最后一个字的点去除刚好整除为0，可以考虑用下面的方法——通用一些
//if ((location % (vinfo.xres * vinfo.bits_per_pixel / 8)) < (16 * vinfo.bits_per_pixel /8))
if((location - (Start_y + 16 * r) * finfo.line_length) > End_x * (vinfo.bits_per_pixel / 8))
{
//计算字最下边的点有没有越界，判断需不需要换屏
if ((location + 16 * finfo.line_length) > (End_x * (vinfo.bits_per_pixel / 8) + End_y * finfo.line_length))
{
Flag_Hz = 1;
Next_screen(location_t, color, ch, Flag_Hz);
}else
{
r = r + 1;
Next_line(location_t,r);
}
}
//字最右边的点没有越界,位置要记得复位
else
location -= 16 * (vinfo.bits_per_pixel / 8);
//打印16X16字
Draw_text16X16(location, color, ch);
//指向下一个字或字符的起始位置
location += 16 * (vinfo.bits_per_pixel / 8);
}
void Put_lcd_CH(long location_t, unsigned short color, unsigned char ch[])
{
int Flag_Hz = 0; //汉字标志位，默认为字符非汉字
//计算字最右边的点有没有越界,判断位置需不需要换行
location += 8 * (vinfo.bits_per_pixel / 8);
//判断位置需不需要换行
if ((location - (Start_y + 16 * r) * finfo.line_length) > End_x * (vinfo.bits_per_pixel / 8))
{
//计算字最下边的点有没有越界，判断需不需要换屏
if ((location + 16 * finfo.line_length) > (End_x * (vinfo.bits_per_pixel / 8) + End_y * finfo.line_length))
{
Next_screen(location_t, color, ch, Flag_Hz);
}else
{
r = r + 1;
Next_line(location_t,r);
}
}
else
location -= 8 * (vinfo.bits_per_pixel / 8);
//打印16X8字
Draw_text16X8(location, color, ch);
location += 8 * (vinfo.bits_per_pixel / 8);
}
//换行符处理函数
void do_line_break(long location_t)
{
//换行有可能是刚刚好也是换屏的时候
if ((location + 16 * finfo.line_length) > (End_x * (vinfo.bits_per_pixel / 8) + (End_y - 1) * finfo.line_length))
{
Next_screen(location_t, 0, "next_screen", 2);
}else
{
r = r + 1;
Next_line(location_t, r);
}
}
int main(void)
{
int fd, fp; //fp----LCD fd------.txt
FILE *Hz_fp; //Hz_fp-----HZK16
struct stat txt_stat; //文件状态，可获得文件的字节数
off_t file_size; //文件字节数
unsigned int hz_index, assic_index; //汉字在汉字库中的偏移量
unsigned char *buffer; //存放文本文件内容的缓存
unsigned char hz_buf[32], assic_buf[16]; //存放字模的数组
long location_t; //保存一屏的起始位置
//打开LCD设备
fp = open("/dev/fb0", O_RDWR);
if(fp < 0)
{
printf("Error : Can not open framebuffer device\n");
exit(1);
}
puts("hello world.\n");
printf("open framebuffer device\n");
//初始化lcd
if (ioctl(fp, FBIOGET_FSCREENINFO, &finfo))
{
printf("Error reading fixed information\n");
exit(2);
}
if (ioctl(fp, FBIOGET_VSCREENINFO, &vinfo))
{
printf("Error reading fixed information\n");
exit(3);
}
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fp, 0);
if ((int)fbp == -1)
{
printf("Error: failed to map framebuffer device to memory.\n");
exit(4);
}
//清屏
Clean_screen();
//一屏的起始位置location_t
location_t = Start_x * (vinfo.bits_per_pixel / 8) + Start_y * finfo.line_length;
//location做一个全局变量，用于确定每个汉字或字符的输出位置
location = location_t;
fk = open("/dev/buttons", O_RDWR);
if (fk < 0)
{
printf("can't open /dev/buttons\n");
return -1;
}
//打开16x16的汉字库
Hz_fp = fopen("HZK16", "rb");
if (Hz_fp == NULL)
{
printf("HZK16 can't open!\n");
return (-1);
}
//打开txt文本
fd = open("/home/1.txt", O_RDONLY);
if (fd < 0)
{
printf("txt can't open!\n");
return -1;
}
//通过struct stat结构体求得文本的字节数
fstat(fd, &txt_stat);
file_size = txt_stat.st_size;
//开辟与文本字节数一样大小的缓存
buffer = (unsigned char *)malloc(file_size);
//将申请到的缓存清零
memset(buffer, 0, file_size);
//一次性将文本的内容读到缓存中
read(fd,buffer, file_size);
while(*buffer != '\0')
{
//文本换行符
if (*buffer == '\r' || *buffer == '\n')
{
do_line_break(location_t); //换行符处理函数
buffer += 1;
continue;
}
//一个tab用四个字节代替
if (*buffer == '\t')
{
location += 32 * (vinfo.bits_per_pixel / 8);
*buffer++;
count += 1;
continue;
}
if (*buffer == ' ' || *buffer == 0xa1)
{
location += 8 * (vinfo.bits_per_pixel / 8);
*buffer++;
count += 1;
continue;
}
//判断汉字还是英文
if (*buffer > 0xa1)
{
hz_index = ((*buffer - 0xa1) * 94 + (*(buffer + 1) - 0xa1)) * 32;
fseek(Hz_fp, hz_index, SEEK_SET);
fread(hz_buf, 32, 1, Hz_fp);
Put_lcd_Hz(location_t, 0xf800, hz_buf);
//sleep(1);
buffer += 2;
count += 2;
}
else
{
assic_index = *buffer * 16;
memcpy(assic_buf, &Assic[assic_index], 16);
Put_lcd_CH(location_t, 0x07e0, assic_buf);
count++;
buffer++;
}
}
munmap(fbp, screensize);
close(fp);
fclose(Hz_fp);
close(fk);
close(fd);
return 0;
}

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