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/*
bitmap.c
AUTHORS:
nuha@sr-research.com nj
based on code by Michael Sweet
PLATFORMS:
All.
*/
#include "PsychEyelink.h"
#include "bitmap.h"
#include <errno.h>
#ifdef WIN32
/*
* 'LoadDIBitmap()' - Load a DIB/BMP file from disk.
*
* Returns a pointer to the bitmap if successful, NULL otherwise...
*/
psych_uint8* LoadDIBitmap(const char *filename, BITMAPINFO **info) /* O - Bitmap information */
{
FILE *fp; // Open file pointer
psych_uint8 *bits; // Bitmap pixel bits
int bitsize; // Size of bitmap
int infosize; // Size of header information
BITMAPFILEHEADER header; // File header
if ((fp = fopen(filename, "rb")) == NULL){
printf("Bitmap Loader: can't open file\n");
return (NULL);
}
if (fread(&header, sizeof(BITMAPFILEHEADER), 1, fp) < 1)
{
printf("Bitmap Loader: No header information\n");
fclose(fp);
return (NULL);
}
if (header.bfType != 'MB') // Check for BM reversed...
{
printf("Bitmap Loader: not a bitmap file\n");
fclose(fp);
return (NULL);
}
infosize = header.bfOffBits - sizeof(BITMAPFILEHEADER);
if ((*info = (BITMAPINFO *)malloc(infosize)) == NULL)
{
printf("Bitmap Loader: bitmapinfo memory allocation failed\n");
fclose(fp);
return (NULL);
}
if (fread(*info, 1, infosize, fp) < infosize)
{
printf("Bitmap Loader: couldn't read memory\n");
free(*info);
fclose(fp);
return (NULL);
}
if ((*info)->bmiHeader.biBitCount != 32 && (*info)->bmiHeader.biBitCount != 24){
printf("Bitmap loading error: Bitmap must be 24 bits or 32 bits\n");
free(*info);
fclose(fp);
return (NULL);
}
if ((*info)->bmiHeader.biCompression != 0){
printf("Bitmap Loading Error: Bitmap must not be compressed\n");
free(*info);
fclose(fp);
return (NULL);
}
// Now that we have all the header info read in, allocate memory for
// the bitmap and read *it* in...
if ((bitsize = (*info)->bmiHeader.biSizeImage) == 0)
bitsize = ((*info)->bmiHeader.biWidth * (*info)->bmiHeader.biBitCount + 7) / 8 * abs((*info)->bmiHeader.biHeight);
else
bitsize = (*info)->bmiHeader.biSizeImage;
if ((bits = malloc(bitsize)) == NULL) {
// Couldn't allocate memory - return NULL!
printf("Bitmap Loader: Couldn't allocate memory for bitmap\n");
free(*info);
fclose(fp);
return (NULL);
}
if (fread(bits, 1, bitsize, fp) < bitsize) {
// Couldn't read bitmap - free memory and return NULL!
printf("Bitmap Loader: Couldn't read bitmap\n");
free(*info);
free(bits);
fclose(fp);
return (NULL);
}
// OK, everything went fine - return the allocated bitmap...
fclose(fp);
if (bits == NULL){
printf("Bitmap Loader: output is NULL\n");
free(*info);
return (NULL);
}
return (bits);
}
#else /* !WIN32 */
/*
* Functions for reading and writing 16- and 32-bit little-endian integers.
*/
static unsigned short read_word(FILE *fp);
static unsigned int read_dword(FILE *fp);
static int read_long(FILE *fp);
psych_uint8* LoadDIBitmap(const char *filename, BITMAPINFO **info)
{
int bitsize; // Size of bitmap
int infosize; // Size of header information
int index;
int newIndex = 0;
int r;
int c;
int pitch;
FILE *fp; // Open file pointer
psych_uint8 *bits; // Bitmap pixel bits
BITMAPFILEHEADER header; // File header
if ((fp = fopen(filename, "rb")) == NULL) {
printf("Bitmap Loader: can't open file\n");
return (NULL);
}
// Read the file header and any following bitmap information...
header.bfType = read_word(fp);
header.bfSize = read_dword(fp);
header.bfReserved1 = read_word(fp);
header.bfReserved2 = read_word(fp);
header.bfOffBits = read_dword(fp);
if (header.bfType != BF_TYPE) // Check for BM reversed...
{
// Not a bitmap file - return NULL...
fclose(fp);
printf("Bitmap Loader: not a bitmap file\n");
return (NULL);
}
infosize = header.bfOffBits - 18;
if ((*info = (BITMAPINFO *)malloc(sizeof (BITMAPINFO))) == NULL)
{
// Couldn't allocate memory for bitmap info - return NULL...
fclose(fp);
printf("Bitmap Loader: bitmapinfo memory allocation failed\n");
return (NULL);
}
(*info)->bmiHeader.biSize = read_dword(fp);
(*info)->bmiHeader.biWidth = read_long(fp);
(*info)->bmiHeader.biHeight = read_long(fp);
(*info)->bmiHeader.biPlanes = read_word(fp);
(*info)->bmiHeader.biBitCount = read_word(fp);
(*info)->bmiHeader.biCompression = read_dword(fp);
(*info)->bmiHeader.biSizeImage = read_dword(fp);
(*info)->bmiHeader.biXPelsPerMeter = read_long(fp);
(*info)->bmiHeader.biYPelsPerMeter = read_long(fp);
(*info)->bmiHeader.biClrUsed = read_dword(fp);
(*info)->bmiHeader.biClrImportant = read_dword(fp);
if ((*info)->bmiHeader.biBitCount != 32 && (*info)->bmiHeader.biBitCount != 24){
printf("Bitmap loading error: Bitmap must be either 24 or 32 bits");
free(*info);
fclose(fp);
return (NULL);
}
if ((*info)->bmiHeader.biCompression != 0){
printf("Bitmap Loading Error: Bitmap must not be compressed");
free(*info);
fclose(fp);
return (NULL);
}
if ((bitsize = (*info)->bmiHeader.biSizeImage) == 0)
bitsize = ((*info)->bmiHeader.biWidth * (*info)->bmiHeader.biBitCount + 7) / 8 * abs((*info)->bmiHeader.biHeight);
else
bitsize = (*info)->bmiHeader.biSizeImage;
if ((bits = malloc(bitsize)) == NULL)
{
free(*info);
fclose(fp);
printf("Bitmap Loader: memory allocation failed\n");
return (NULL);
}
if (fread(bits, 1, bitsize, fp) < bitsize)
{
free(*info);
free(bits);
fclose(fp);
printf("Bitmap Loader: couldn't read memory\n");
return (NULL);
}
fclose(fp);
return (bits);
}
/*
* 'read_word()' - Read a 16-bit unsigned integer.
*/
static unsigned short read_word(FILE *fp) /* I - File to read from */
{
unsigned char b0, b1;
b0 = getc(fp);
b1 = getc(fp);
return ((b1 << 8) | b0);
}
/*
* 'read_dword()' - Read a 32-bit unsigned integer.
*/
static unsigned int read_dword(FILE *fp)
{
unsigned char b0, b1, b2, b3;
b0 = getc(fp);
b1 = getc(fp);
b2 = getc(fp);
b3 = getc(fp);
return ((((((b3 << 8) | b2) << 8) | b1) << 8) | b0);
}
/*
* 'read_long()' - Read a 32-bit signed integer.
*/
static int read_long(FILE *fp) {
unsigned char b0, b1, b2, b3;
b0 = getc(fp);
b1 = getc(fp);
b2 = getc(fp);
b3 = getc(fp);
return ((int)(((((b3 << 8) | b2) << 8) | b1) << 8) | b0);
}
#endif /* WIN32 */
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