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bmp2matrix.c
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bmp2matrix.c
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/* bmp2matrix.c
*
* This code acquires 3 matrices for 3 channels (RGB)
* of a BMP image.
*
* Last modified on February 28, 2021
*
* by Freeman Sun
*/
#include <stdint.h>
#include <stdio.h>
#include <windows.h>
#include <unistd.h>
// Global Variables
uint32_t bmpInfo[3];
// bmpInfo[0] : Data adress
// bmpInfo[1] : Width
// bmpInfo[2] : Height
void bmpInfoFill(FILE* bmpPtr)
{
// Write Data adress, width, and height into bmpInfo[]
// Arguments:
// bmpPtr -> BMP file stream, opened in "rb" mode
// This function calls fscanf() 26 times.
uint32_t dataAdress, width, height;
uint32_t counter = 0, counter2;
uint8_t Byte;
while(counter < 10) {
fscanf(bmpPtr, "%c", &Byte);
counter++;
} //Byte 9
// Data Adress
fscanf(bmpPtr, "%c", &Byte); //Byte 10
dataAdress = Byte;
fscanf(bmpPtr, "%c", &Byte); //Byte 11
dataAdress += Byte*0x100;
fscanf(bmpPtr, "%c", &Byte); //Byte 12
dataAdress += Byte*0x10000;
fscanf(bmpPtr, "%c", &Byte); //Byte 13
dataAdress += Byte*0x1000000;
bmpInfo[0] = dataAdress;
counter = 14;
while(counter <= 17) {
fscanf(bmpPtr, "%c", &Byte);
counter++;
} //Byte 17
//Width data
fscanf(bmpPtr, "%c", &Byte); //Byte 18
width = Byte;
fscanf(bmpPtr, "%c", &Byte); //Byte 19
width += Byte*0x100;
fscanf(bmpPtr, "%c", &Byte); //Byte 20
width += Byte*0x10000;
fscanf(bmpPtr, "%c", &Byte); //Byte 21
width += Byte*0x1000000;
bmpInfo[1] = width;
// Height data
fscanf(bmpPtr, "%c", &Byte); //Byte 22
height = Byte;
fscanf(bmpPtr, "%c", &Byte); //Byte 23
height += Byte*0x100;
fscanf(bmpPtr, "%c", &Byte); //Byte 24
height += Byte*0x10000;
fscanf(bmpPtr, "%c", &Byte); //Byte 25
height += Byte*0x1000000;
bmpInfo[2] = height;
} // bmpInfoFill()
void pixels2pipe(FILE* bmpPtr, int pipe_w)
{
// Transfer pixel data into the pipe
// Arguments:
// bmpPtr -> BMP file stream, opened in "rb" mode
// pipe_w -> pipe for writing
// Recommended to call after bmpInfoFill()
int mod4 = (bmpInfo[1]%4);
// In BMP file format, number of Bytes of
// each row (horizontal pixels) must be a
// multiple of 4
int counter = 26;
// After bmpInfoFill(), fscanf() will be at Byte 26
uint8_t Byte;
int counter2 = 0;
int c3;
// From Byte 26 to data adress byte
while(counter < bmpInfo[0]) {
fscanf(bmpPtr, "%c", &Byte);
counter++;
} // Data adress Byte
printf("Data adress: %d\n", counter);
counter = 0;
while(counter < (bmpInfo[1]*bmpInfo[2])) {
if(counter2 < bmpInfo[1]) {
fscanf(bmpPtr, "%c", &Byte);
write(pipe_w, &Byte, sizeof(Byte));
fscanf(bmpPtr, "%c", &Byte);
write(pipe_w, &Byte, sizeof(Byte));
fscanf(bmpPtr, "%c", &Byte);
write(pipe_w, &Byte, sizeof(Byte));
counter++;
counter2++;
} else {
for(c3 = 0; c3 < mod4; c3++) {
fscanf(bmpPtr, "%c", &Byte);
}
counter2 = 0;
}
}
printf("Pixel: %d\n", counter);
} // pixels2pipe()
void pipe2matrices(
int pipe_r,
uint8_t R_m[bmpInfo[2]][bmpInfo[1]],
uint8_t G_m[bmpInfo[2]][bmpInfo[1]],
uint8_t B_m[bmpInfo[2]][bmpInfo[1]])
{
// Transfer the data from the pipe into the RGB matrices
// Arguments:
// pipe_r -> "read" end of the pipe
// R_m -> RED Channel Matrix
// G_m -> GREEN Channel Matrix
// B_m -> BLUE Channel Matrix
uint32_t x,y;
uint8_t Byte;
for(y = 1; y <= bmpInfo[2]; y++) {
for(x = 0; x < bmpInfo[1]; x++) {
read(pipe_r, &Byte, sizeof(uint8_t));
B_m[bmpInfo[2]-y][x] = Byte;
read(pipe_r, &Byte, sizeof(uint8_t));
G_m[bmpInfo[2]-y][x] = Byte;
read(pipe_r, &Byte, sizeof(uint8_t));
R_m[bmpInfo[2]-y][x] = Byte;
}
}
} // pipe2matrices()
int main(int argc, char** argv)
{
const char *bmpFileName = argv[1];
FILE *fPtr;
if( (fPtr = fopen(bmpFileName, "rb")) == NULL ) {
MessageBox(0, argv[1], "Not opened!",
MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);
return -1;
}
// Write Data adress, width, and height into bmpInfo[]
bmpInfoFill(fPtr);
// bmpInfo[1] : Width
// bmpInfo[2] : Height
uint8_t R_matrix[bmpInfo[2]][bmpInfo[1]];
uint8_t G_matrix[bmpInfo[2]][bmpInfo[1]];
uint8_t B_matrix[bmpInfo[2]][bmpInfo[1]];
// Create a pipe,
int pipefd[2]; // File Decriptors for 2 ends of the pipe
_pipe(pipefd, 0, 0);
// Transfer pixel data into the pipe
pixels2pipe(fPtr, pipefd[1]);
fclose(fPtr); //close BMP file
printf("width: %d , height: %d\n", bmpInfo[1], bmpInfo[2]);
// Transfer the data from the pipe into the RGB matrices
pipe2matrices(pipefd[0], R_matrix, G_matrix, B_matrix);
uint32_t x,y;
// Print RED channel matrix
printf("\nRED\n");
for(y = 0; y < bmpInfo[2]; y++) {
for(x = 0; x < bmpInfo[1]; x++) {
printf("%d\t", R_matrix[y][x]);
}
printf("\n");
}
// Print GREEN channel matrix
printf("\nGREEN\n");
for(y = 0; y < bmpInfo[2]; y++) {
for(x = 0; x < bmpInfo[1]; x++) {
printf("%d\t", G_matrix[y][x]);
}
printf("\n");
}
// Print BLUE channel matrix
printf("\nBLUE\n");
for(y = 0; y < bmpInfo[2]; y++) {
for(x = 0; x < bmpInfo[1]; x++) {
printf("%d\t", B_matrix[y][x]);
}
printf("\n");
}
return 0;
} // main()