main.c
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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
if(argc != 3)
{
printf("bmp2rgb565 [BMP_SRC] [RGB565_DEST]\n");
return 1;
}
FILE* src = NULL;
FILE* dst = NULL;
unsigned char buffer[5];
int initOffsetBMP;
src = fopen(argv[1], "r");
dst = fopen(argv[2], "w");
if(src == NULL)
{
printf("Unable to open the BMP file\n");
return 2;
}
if(dst == NULL)
{
printf("Unable to open the RGB565 file\n");
return 3;
}
printf("Reading BMP\n");
fseek(src, 0x0A, SEEK_SET);
buffer[0] = getc(src);
buffer[1] = getc(src);
buffer[2] = getc(src);
buffer[3] = getc(src);
printf("Pixel array offset %02x %02x %02x %02x\n", buffer[3], buffer[2], buffer[1], buffer[0]);
initOffsetBMP = buffer[0] + (buffer[1] >> 8) + (buffer[2] >> 16) + (buffer[3] >> 24);
fseek(src, 0x12, SEEK_SET);
buffer[0] = getc(src);
buffer[1] = getc(src);
buffer[2] = getc(src);
buffer[3] = getc(src);
printf("Width %02x %02x %02x %02x\n", buffer[3], buffer[2], buffer[1], buffer[0]);
//fseek(src, 0x12, SEEK_SET);
buffer[0] = getc(src);
buffer[1] = getc(src);
buffer[2] = getc(src);
buffer[3] = getc(src);
printf("Height %02x %02x %02x %02x\n", buffer[3], buffer[2], buffer[1], buffer[0]);
fseek(src, 0x1C, SEEK_SET);
buffer[0] = getc(src);
buffer[1] = getc(src);
printf("Bits Per Pixel %02x %02x\n", buffer[0], buffer[1]);
if(buffer[1] != 0 || buffer[0] != 0x18)
{
printf("Could not read BMP\n");
return 1;
}
fseek(src, initOffsetBMP, SEEK_SET);
printf("Now reading BMP pixels and printing them to the RBG565 file\n");
while(1)
{
buffer[0] = getc(src);
buffer[1] = getc(src);
buffer[2] = getc(src);
if(feof(src))
break;
printf("Pixel BMP 24 bits R %02X G %02X B %02X ", buffer[2], buffer[1], buffer[0]);
buffer[2] = buffer[2] >> 3; //R
buffer[1] = buffer[1] >> 2; //G
buffer[0] = buffer[0] >> 3; //B
printf("-> RGB 565 R %02X G %02X B %02X ", buffer[2], buffer[1], buffer[0]);
buffer[3] = ((buffer[0] & 0x1F) << 3) + ((buffer[1] & 0x38) >> 3);
buffer[4] = ((buffer[1] & 0x07) << 5) + (buffer[2] & 0x1F);
printf("-> RGB 565 M %02X%02X\n", buffer[3], buffer[4]);
fprintf(dst, "%c%c", buffer[4], buffer[3]);
}
printf("Done !\n");
fclose(src);
fclose(dst);
return 0;
}