void Format::printAll()
{
// All format information...
printf(
"Image size info:\n" \
" width:\t\t %d\n" \
" height:\t\t %d\n" \
" bytes per line:\t %d\n" \
" image buffer size:\t %d\n" \
"\nImage format info:\n" \
" pixel format:\t %s\n" \
" colorspace:\t\t %s\n" \
" field:\t\t %s\n",
getWidth(),
getHeight(),
getBytesPerLine(),
getImageSize(),
getPixelFormat(),
getColorspace(),
getField()
);
switch(state) {
case FORMAT_IS_DIRTY:
printf("\nFormat state has not yet been applied.\n");
break;
case FORMAT_IS_NULL:
printf("\nFormat has not yet been fetched.\n");
break;
case FORMAT_FAILED_UPDATE:
printf("\nFormat state update failed to apply cleanly.\n");
break;
case FORMAT_IS_CLEAN:
default:
break;
}
}
int main(void)
{
char *filename = "./test.jpg";
/* Open JPEG image file. Don't forget to use b for binary. */
FILE *file = fopen(filename, "rb");
if (!file) {
printf("Error opening jpeg file %s\n", filename);
return -1;
}
/*
* This struct contains the JPEG compression parameters and pointers to
* working space (which is allocated as needed by the JPEG library).
*/
struct jpeg_decompress_struct cinfo;
/*
* This struct represents a JPEG error handler.
*/
struct jpeg_error_mgr jerr;
/* Setup the error handler */
cinfo.err = jpeg_std_error(&jerr);
/* Initialize JPEG decompression object */
jpeg_create_decompress(&cinfo);
/* Specify input file */
jpeg_stdio_src(&cinfo, file);
/* Read JPEG file header */
(void)jpeg_read_header(&cinfo, TRUE);
/* Get colorspace */
int colorspace = getColorspace(cinfo);
/* Print colorspace name based on other int */
switch (colorspace) {
case 3:
printf("Image colorspace is RGB\n");
break;
case 1:
printf("Image colorspace is grayscale\n");
break;
default:
printf("No colorspace recognized");
break;
}
/* Release memory */
jpeg_destroy_decompress(&cinfo);
/* Close input file */
fclose(file);
system("pause");
return 0;
}
