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readpict.h
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C/C++ Source or Header
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1992-01-04
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2KB
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63 lines
#ifndef READPICT_H
#define READPICT_H
/** ReadPict.h **************************************************************/
/* */
/* Read an ILBM raster image file into RAM. 1/23/86. */
/* */
/* By Jerry Morrison, Steve Shaw, and Steve Hayes, Electronic Arts. */
/* This software is in the public domain. */
/* */
/* USE THIS AS AN EXAMPLE PROGRAM FOR AN IFF READER. */
/* */
/* The IFF reader portion is essentially a recursive-descent parser. */
/****************************************************************************/
/* ILBMFrame is our "client frame" for reading FORMs ILBM in an IFF file.
* We allocate one of these on the stack for every LIST or FORM encountered
* in the file and use it to hold BMHD & CMAP properties. We also allocate
* an initial one for the whole file. */
typedef struct {
ClientFrame clientFrame;
UBYTE foundBMHD;
UBYTE nColorRegs;
BitMapHeader bmHdr;
Color4 colorMap[32 /*1<<MaxAmDepth*/ ];
/* If you want to read any other property chunks, e.g. GRAB or CAMG, add
* fields to this record to store them. */
} ILBMFrame;
/** ReadPicture() ***********************************************************
*
* Read a picture from an IFF file, given a file handle open for reading.
* Allocates BitMap RAM by calling (*Allocator)(size).
*
****************************************************************************/
typedef UBYTE *UBytePtr;
#ifdef FDwAT
typedef UBytePtr Allocator(LONG);
/* Allocator: a memory allocation procedure which only requires a size
* argument. (No Amiga memory flags argument.) */
extern IFFP ReadPicture(LONG, struct BitMap *, ILBMFrame *, Allocator *);
/* file, bm, iFrame, allocator */
/* iFrame is the top level "client frame". */
/* allocator is a ptr to your allocation procedure. It must always
* allocate in Chip memory (for bitmap data). */
/* PS: Notice how we used two "typedef"s above to make allocator's type
* meaningful to humans.
* Consider the usual C style: UBYTE *(*)(), or is it (UBYTE *)(*()) ? */
#else /* not FDwAT */
typedef UBytePtr Allocator();
extern IFFP ReadPicture();
#endif
#endif READPICT_H