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//////////////////////////////////////////////////////////////////
//
// Copyright(C), 2013-2016, GEC Tech. Co., Ltd.
//
// File name: GPLE/bmp.c
//
// Author: Vincent Lin (林世霖) 微信公眾號：秘籍酷
//
// Date: 2016-11
//
// Description: 處理BMP格式圖像數(shù)據(jù)
//
// GitHub: github.com/vincent040 Bug Report: 2437231462@qq.com
//
//////////////////////////////////////////////////////////////////
#include <errno.h>
#include "bmp.h"
#include "ts.h"
char * load_bmp(const char *bmpfile, struct image_info *minfo)
{
int fd = open(bmpfile, O_RDONLY);
if(fd == -1)
{
fprintf(stderr, "opening \"%s\" failed: %s\n",
bmpfile, strerror(errno));
exit(0);
}
// 獲得文件大小，并分配內(nèi)存
struct stat fileinfo;
fstat(fd, &fileinfo);
int rgb_size = fileinfo.st_size;
char *rgb_buf = calloc(1, rgb_size);
// 讀取BMP內(nèi)容到內(nèi)存中
struct bitmap_header header;
struct bitmap_info info;
struct rgb_quad quad;
read(fd, &header, sizeof(header));
read(fd, &info, sizeof(info));
if(info.compression != 0)
{
read(fd, &quad, sizeof(quad));
fprintf(stderr, "read quad! \n");
}
read(fd, rgb_buf, rgb_size);
minfo->width = info.width;
minfo->height= info.height;
minfo->pixel_size = info.bit_count/8;
#ifdef DEBUG
printf("width: %d\n", minfo->width);
printf("height: %d\n", minfo->height);
printf("pixel_size: %d\n", minfo->pixel_size);
#endif
close(fd);
return rgb_buf;
}
void bmp2lcd(char *bmpfile, char *FB,
struct fb_var_screeninfo *vinfo,
int xoffset, int yoffset)
{
xoffset = xoffset>(65*12+10) ? (65*10+10) : xoffset;
struct image_info *minfo = calloc(1, sizeof(struct image_info));
char *rgb_buf = load_bmp(bmpfile, minfo);
char *tmp = rgb_buf;
// 從最后一行開始顯示BMP圖像
int pad = ((4-( minfo->width * minfo->pixel_size ) % 4)) % 4; // 0-3
rgb_buf += (minfo->width * minfo->pixel_size + pad) * (minfo->height-1);
FB += (yoffset * vinfo->xres + xoffset) * 4;
int lcd_w = vinfo->xres - xoffset;
int lcd_h = vinfo->yres - yoffset;
int x, y;
for(x=0; x<lcd_h && x<minfo->height; x++)
{
for(y=0; y<lcd_w && y<minfo->width; y++)
{
unsigned long lcd_offset = (vinfo->xres*x + y) * 4;
rgb_buf += minfo->pixel_size;
memcpy(FB + lcd_offset + vinfo->red.offset/8, rgb_buf + 2, 1);
memcpy(FB + lcd_offset + vinfo->green.offset/8, rgb_buf + 1, 1);
memcpy(FB + lcd_offset + vinfo->blue.offset/8, rgb_buf + 0, 1);
}
rgb_buf += pad;
rgb_buf -= (minfo->width * minfo->pixel_size + pad) * 2;
}
free(tmp);
}
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