rgb888 to rgb565 application source code

 bitmap convert to rgb application... source code:

 #include <stdio.h> #include <windows.h> #pragma pack(2) /*2 byte packing */ typedef struct { unsigned short int type; unsigned int size; unsigned short int reserved1,reserved2; unsigned int offset; }Header; #pragma pack() /* Default packing */ typedef struct { unsigned long size; unsigned long width; unsigned long height; unsigned short planes; unsigned short bitcount; unsigned long compression; unsigned long sizeimage; long xpelspermeter; long ypelspermeter; unsigned long colorsused; unsigned long colorsimportant; }Infoheader; typedef struct { BYTE red; BYTE green; BYTE blue; } Single_pixel; FILE *fp_rgb; //global file pointer to rgb image void BMP24ToRGB565 ( BYTE *bmp_24 ) { BYTE *rgb_565 = new BYTE[2]; BYTE Red24 = bmp_24[0]; // 8-bit red BYTE Green24 = bmp_24[1]; // 8-bit green BYTE Blue24 = bmp_24[2]; // 8-bit blue BYTE Red16 = Red24 >> 3; // 5-bit red BYTE Green16 = Green24 >> 2; // 6-bit green BYTE Blue16 = Blue24 >> 3; // 5-bit blue printf("/n Red16: %x /n", Red16); printf(" Green16: %x /n", Green16); printf(" Blue16: %x /n", Blue16); unsigned short RGB2Bytes = Blue16 + (Green16<<5) + (Red16<<(5+6)); printf(" RGB2Bytes: %d /n", RGB2Bytes); rgb_565[0] = LOBYTE(RGB2Bytes); rgb_565[1] = HIBYTE(RGB2Bytes); printf(" rgb_565[0]: %x /n", rgb_565[0]); printf(" rgb_565[1]: %x /n/n", rgb_565[1]); //fwrite(rgb_565,1, sizeof(rgb_565), fp_rgb); BYTE low = rgb_565[0]; BYTE high = rgb_565[1]; fwrite(&low, 1, sizeof(low), fp_rgb); fwrite(&high, 1, sizeof(high), fp_rgb); } int main() { Header headfirst; Infoheader headsecond; Single_pixel single_pixel; int byte_border; /* binary opening of the input image file (24bit bmp) */ FILE *fin; fin = fopen("resim.bmp","rb+"); if(fin==NULL) //file doesnt exist { printf("Error opening first file"); exit(0); return 0; } /* binary opening of the output image file (rgb565) */ fp_rgb = fopen("rgb565.bin", "wb"); //from first header fread(&headfirst,sizeof(headfirst),1,fin); printf("type: %x/n",headfirst.type); printf("total size: %u/n",headfirst.size); printf("offset: %u/n",headfirst.offset); //from second header fread(&headsecond,sizeof(headsecond),1,fin); printf("width: %u/n",headsecond.width); printf("width: %u/n",headsecond.height); printf("bitcount(color depth): %u/n",headsecond.bitcount); printf("size image (image size): %u/n",headsecond.sizeimage); //size calculations byte_border = headsecond.sizeimage / 1024; //calculate how many bytes the image size is. printf("image size in bytes: %d/n", byte_border); //BMP pixel array BYTE *bmp_24 = new BYTE[3]; for(int i = 0; i< byte_border / 3; i++) //should loop for byte_border/3, consequently reading all BMP pixels in the image { fread(&single_pixel,sizeof(single_pixel),1,fin); printf("red: %x/n",single_pixel.red); printf("green: %x/n",single_pixel.green); printf("blue: %x/n",single_pixel.blue); bmp_24[0] = single_pixel.red; bmp_24[1] = single_pixel.green; bmp_24[2] = single_pixel.blue; BMP24ToRGB565(bmp_24); } fclose(fin); fclose(fp_rgb); /* TEST PART ---> checking output rgb565 file */ FILE *fp_test; fp_test = fopen("rgb565.bin","rb+"); if(fp_test==NULL) //file doesnt exist { printf("Error opening first file"); exit(0); return 0; } unsigned short RGB2Bytes; BYTE *rgb565_test = new BYTE[2]; BYTE low; BYTE high; for(int i = 0; i< 20 /*(byte_border / 3) * 2 */; i++) //should loop for byte_border/3 *2 , consequently reading all RGB pixels in the image { //fread(&RGB2Bytes,sizeof(RGB2Bytes),1,fp_test); //rgb565_test[0] = LOBYTE(RGB2Bytes); //rgb565_test[1] = HIBYTE(RGB2Bytes); //printf("/n RGB TEST - RGB2Bytes: %d/n", RGB2Bytes); //printf("RGB TEST - rgb565_test[0]: %x/n",rgb565_test[0]); //printf("RGB TEST - rgb565_test[1]: %x/n/n",rgb565_test[1]); fread(&low,sizeof(low),1,fp_test); fread(&high,sizeof(high),1,fp_test); printf("/nRGB TEST - low: %x/n", low); printf("RGB TEST - high: %x/n", high); } system("pause"); return 0; }