由于需要bpp-16 的BMP文件,只是现在Window 10自带的画图程序没法直接转换出来。只好上网找下代码,去转原24-bit 的BMP出来。找了好几个程序,转出来的东西都无法显示,没办法只得自己研究下,搞了一下午,总算把这些代码的窟窿都堵上了,差不多重写了一遍,实测成功!
分享给其他有同样需求的人。
编译: c++ -o convert_bmp /mnt/hgfs/WIN_D/share/convert_bmp24to16.cpp
测试:./convert_bmp 1.bmp
SrcCode: convert_bmp24to16.cpp
/*
* 24位深的bmp图片转换为16位深RGB565格式的bmp图片
* Original: from network
* Modified by Golden.Chen 2019/02/16
*/
#include
#include
#include
using namespace std;
typedef unsigned char uint8;
typedef unsigned short uint16; //32bit system
typedef unsigned int uint32;//32bit system
#define SRC_BMP_BPP 24 /* bits per pixel */
#define DST_BMP_BPP 16
struct bmp_filehead //size: 14B
{
uint16 bmtype; //0x424d ='BM'
uint16 bmtotalsize; //total file size
uint16 bmtotalsizeH;
uint16 bmReserved;//reserve word,fixed to : 0x0000
uint16 bmReservedH;
uint16 bmOffBits;//offset of image data
uint16 bmOffBitsH;
}bmphead;
struct bmp_infohead //size: 40B
{
uint32 bmpheadsize;//size of infoheader
uint32 bmp_width;//image width
uint32 bmp_height;//image height
uint16 bmplans;//planes,0 or 1
uint16 bitcount;//bits per pixel,24
uint32 compress_type;/* 0 - rgb, 1 - rle8, 2 - rle4, 3 - BITFEILDS */
uint32 imagesize;//size of image data
uint32 biXPelsPerMeter;
uint32 biYPelsPerMeter;
uint32 biClrUsed;
uint32 biClrImportant;
}infohead;
int bmp565_write_header(struct bmp_filehead *pfhd,struct bmp_infohead *pinfo,FILE *fp)
{
int ret;
uint32 widthsize,head_size,imgdata_offset;
uint8 rgb_mask[12] = {// RGBQUAD MASK
0x00, 0xF8, 0x00, 0x00, //red mask
0xE0, 0x07, 0x00, 0x00, //green mask
0x1F, 0x00, 0x00, 0x00 //blue mask
};
widthsize = (((uint32)pinfo->bmp_width * DST_BMP_BPP + 31) >> 5) << 2;
head_size = sizeof(struct bmp_filehead) + sizeof(struct bmp_infohead) + sizeof(rgb_mask);
/* base on src data ,initialize bmp_infoheader*/
pinfo->bitcount = DST_BMP_BPP;
pinfo->compress_type = 3 ; //only valid when BPP == 16 or 32
pinfo->imagesize = pinfo->bmp_height * widthsize;
pinfo->biXPelsPerMeter = 0;
pinfo->biYPelsPerMeter = 0;
pinfo->biClrUsed = 0;
pinfo->biClrImportant = 0;
/* base on src data ,initialize bmp_fileheader*/
pfhd->bmtotalsize = (head_size + pinfo->imagesize) & 0xFFFF;
pfhd->bmtotalsizeH = (head_size + pinfo->imagesize) >> 16;
pfhd->bmOffBits = head_size & 0xFFFF;
pfhd->bmOffBitsH = head_size >> 16;
//write header data to fp
ret = fwrite(pfhd, 1, sizeof(struct bmp_filehead), fp);
if(ret != sizeof(struct bmp_filehead)) return -1;
ret = fwrite(pinfo, 1, sizeof(struct bmp_infohead), fp);
if(ret != sizeof(struct bmp_infohead)) return -1;
ret = fwrite(rgb_mask, 1, sizeof(rgb_mask), fp);
if(ret != sizeof(rgb_mask)) return -1;
return 0;
}
#define bmp565_write_imgdata(buf,block,count,fp) \
fwrite(buf, block, count, fp);
int main(int argc, char *argv[])
{
FILE *src_fp,*dst_fp;
char src_file[64] = "";
char dst_file[64] = "";
uint8 *imagebuf=NULL,*bmpwidbuf=NULL;
uint32 src_widsize,dst_widsize;
uint16 k,q,d;
int ret=0,n;
if(argc < 2)
{
printf("\nUsage: %s \n",argv[0]);
printf("\n %s