Retrieving DIB Information

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If you formerly retrieved information about an image by getting a pointer to the DIB and reading from the DIB header, refer to this table to see how to get the same information in other ways:

DIB header field	From a HIGEAR...	From a HIGDIBINFO...
biSize	N/A	N/A
biWidth	IG_image_dimensions_get	IG_DIB_width_get
biHeight	IG_image_dimensions_get	IG_DIB_height_get
biPlanes	N/A	N/A
biBitCount* (see following sections)	IG_image_dimensions_get, IG_DIB_legacy_bit_depth_get	IG_DIB_bit_depth_get, IG_DIB_channel_count_get + IG_DIB_channel_depths_get
biCompression* (see following sections)	IG_image_colorspace_get, IG_image_compression_type_get	IG_DIB_colorspace_get
biSizeImage	N/A	N/A
biXPelsPerMeter	IG_image_resolution_get	IG_DIB_resolution_get
biYPelsPerMeter	IG_image_resolution_get	IG_DIB_resolution_get
biClrUsed	N/A	N/A
biClrImportant	N/A	N/A

Note that you need a HIGDIBINFO handle for all functions in the right column of this table. Here's an example of how to get one from a HIGEAR, get some information, and clean up:

	Copy Code
AT_ERRCOUNT nErrcount; /* Number of errors on stack / HIGDIBINFO hDIBInfo; / DIB info handle / HIGEAR hImage; / HIGEAR handle of image / AT_DIMENSION width; / Returned width of image */ nErrcount = IG_image_DIB_info_get(hImage, &hDIBInfo); width = IG_DIB_width_get(hDIBInfo); IG_image_DIB_info_delete(hDIBInfo);

Copy Code

AT_ERRCOUNT nErrcount;  /* Number of errors on stack */ 
HIGDIBINFO hDIBInfo;    /* DIB info handle */ 
HIGEAR hImage;          /* HIGEAR handle of image */ 
AT_DIMENSION width;     /* Returned width of image */ 
nErrcount = IG_image_DIB_info_get(hImage, &hDIBInfo); 
width = IG_DIB_width_get(hDIBInfo);
IG_image_DIB_info_delete(hDIBInfo);

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