LOADINFO

typedef struct _LOADINFO
{
   L_INT Format; /* File format: FILE_PCX, ... */
   L_INT Width; /* Image width */
   L_INT Height; /* Image height */
   L_INT BitsPerPixel; /* Bits per pixel */
   L_INT XResolution; /* X resolution (DPI) */
   L_INT YResolution; /* Y resolution (DPI) */
   L_UINT32 Offset; /* Data offset */
   L_UINT32 Flags; /* Special flags */
   RGBQUAD rgbQuad[256]; /* palette */
} LOADINFO, L_FAR * pLOADINFO;

The LOADINFO structure provides file format information to the LBaseFile::LoadInfoCallBack function, which you can use when loading image data in a format that LEADTOOLS does not recognize. For more information, refer to the LBaseFile::EnableLoadInfoCallBack function.

Member	Description
Format	File format. The following are valid formats:

	FILE_FAX_G3_1D	[66] Raw FAX, compressed using CCITT group 3, 1 dimension.
	FILE_FAX_G3_2D	[67] Raw FAX, compressed using CCITT group 3, 2 dimensions.
	FILE_FAX_G4	[68] Raw FAX, compressed using CCITT group 4.
	FILE_RAW	[153] Raw uncompressed data

Width	Image width in pixels.
Height	Image height in pixels.
BitsPerPixel	Bits per pixel of the image data in the file.
XResolution	Horizontal resolution for rendering the image, specified in dots per inch. This is an optional field.
YResolution	Vertical resolution for rendering the image, specified in dots per inch. This is an optional field.
Offset	Position of the first byte of image data. This can be 0 if your file does not have a header.
Flags	Special flags, which can be specified as follows. You can use a bitwise OR to specify more than one value.

	LOADINFO_TOPLEFT	[0x00000001] The image has a TOP_LEFT view perspective.
	LOADINFO_ORDERRGB	[0x00000002] The color order is RGB.
	LOADINFO_WHITEONBLACK	[0x00000004] The image is white-on-black.
	LOADINFO_LSB	[0x00000008] The least significant bit is filled first.
	LOADINFO_TOPLEFT90	[0x00000010] The image has a TOP_LEFT90 view perspective. (Document/Medical only)
	LOADINFO_TOPLEFT270	[0x00000020] The image has a TOPLEFT270 view perspective. (Document/Medical only)
	LOADINFO_REVERSE	[0x00000040] Each line is reversed (mirrored).
	LOADINFO_TOPLEFT180	[0x00000080] The image has a TOP_LEFT180 view perspective. (Document/Medical only)
	LOADINFO_BOTTOMLEFT90	[0x00000100] The image has a BOTTOM_LEFT90 view perspective. (Document/Medical only)
	LOADINFO_BOTTOMLEFT180	[0x00000200] The image has a BOTTOM_LEFT180 view perspective. (Document/Medical only)
	LOADINFO_BOTTOMLEFT270	[0x00000400] The image has a BOTTOM_LEFT270 view perspective. (Document/Medical only)
	LOADINFO_PAD4	[0x00000800] Each line is padded to a multiple of 4 bytes. (raw data only).
	LOADINFO_PALETTE	[0x00001000] A palette is supplied in the rgbQuad field. (raw data only).
rgbQuad	Palette for uncompressed data that is 8 bits per pixel or less. Fill in the first 2 BitsPerPixel entries in this palette and include the LOADINFO_PALETTE flag in the Flags field.

Comments

pLOADINFO is a pointer to a LOADINFO structure. Where the function parameter type is pLOADINFO, you can declare a LOADINFO variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pLOADINFO variable is necessary only if your program requires a pointer.

LOADINFO_TOPLEFT, LOADINFO_TOPLEFT90 and LOADINFO_TOPLEFT270 cannot be combined.

LOADINFO_REVERSE can be combined with LOADINFO_TOPLEFT, LOADINFO_TOPLEFT90 or LOADINFO_TOPLEFT270. If LOADINFO_REVERSE is set, every line is reversed before being put into the bitmap.

To load a raw fax file, you must override LBaseFile::LoadInfoCallBack. If you recognize the file and you know the height and width of the file, set LOADINFO.Width and LOADINFO.Height to a positive value. To automatically detect the width and height of the fax file, set LOADINFO.Width and LOADINFO.Height to -1.

To load raw uncompressed data, set the Format field to FILE_RAW. Valid values must be set for the following LOADINFO fields: Width, Height, BitsPerPixel, Offset (byte location in the file where the raw data begins). If each line of RAW data is padded so that the number of bytes is a multiple of 4 (as is the case with raw Windows BMP data), include LOADINFO_PAD4 in the Flags field. Include an orientation flag in the Flags field to load the data with the proper orientation. For example, raw Windows BMP data is stored with a BOTTOM_LEFT orientation. If the orientation is unknown, include the TOP_LEFT flag. If the raw data is 8 bits per pixel or less, then the image is palettized and a palette must be generated. If this is the case, include the LOADINFO_PALETTE flag, and fill in the first (2BitsPerPixel) entries of the rgbQuad field.

If the color order is ORDER_RGB then include this flag. If the ORDER_RGB flag is not included, the data will be loaded as ORDER_BGR.