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#include <stdio.h>
#include <stdlib.h>
#include "loadFile.h"
// loads any file into the dest ptr.
void loadFile( const char* fileName, long sizeInBytes, unsigned char* byteDestPtr) {
FILE *f;
int numBytesRead;
f = fopen( fileName, "rb"); // open the file
// don't load if file failed to open
if( f == NULL ) {
return;
}
numBytesRead = fread( (void*)byteDestPtr, sizeof(char), sizeInBytes, f);
fclose(f);
}
// loads a photoshop RAW image file, 32-bit
// NOTE:
// This function exists because photoshop swaps the red and blue channels when
// it saves a file as raw. Thus, the file stream doesn't match the way a video
// card deals with 32-bit color.
// This function loads the file and then swaps the appropriate bytes
void loadRawFile( const char* fileName, long sizeInBytes, unsigned char* byteDestPtr) {
//unsigned char tempChannel;
long byteCount;
FILE *f;
int numBytesRead;
f = fopen( fileName, "rb"); // open the file
// don't load if file failed to open
if( f == NULL ) {
return;
}
numBytesRead = fread( (void*)byteDestPtr, sizeof(char), sizeInBytes, f);
// now that file read, swap the red and blue channels:
for( byteCount = 0; byteCount< sizeInBytes; byteCount=byteCount+4) {
unsigned char alpha = byteDestPtr[byteCount+3];
byteDestPtr[byteCount+3] = byteDestPtr[byteCount+2];
byteDestPtr[byteCount+2] = byteDestPtr[byteCount+1];
byteDestPtr[byteCount+1] = byteDestPtr[byteCount];
byteDestPtr[byteCount] = alpha;
/* tempChannel = byteDestPtr[byteCount]; // currently in red position
byteDestPtr[byteCount] = byteDestPtr[byteCount+3]; // currently set to what's in alpha position
byteDestPtr[byteCount+2] = tempChannel;
*/
}
fclose(f);
}
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