dopus/Program/pchg.h

   1 #ifndef PCHG_H
   2 #define PCHG_H
   3 /*
   4 **      $Filename: iff/pchg.h $
   5 **      $Revision$
   6 **
   7 ** Definitions for the PCHG chunk
   8 */
   9
  10 #define ID_PCHG         MAKE_ID('P','C','H','G')
  11
  12 /* Compression modes */
  13
  14 #define PCHG_COMP_NONE 0
  15 #define PCHG_COMP_HUFFMANN 1
  16
  17 /* Flags */
  18
  19 #define PCHGB_12BIT                     (0)
  20 #define PCHGB_32BIT                     (1)
  21 #define PCHGB_USE_ALPHA         (2)
  22
  23
  24 #define PCHGF_12BIT                     (1<<0)  /* Use SmallLineChanges */
  25 #define PCHGF_32BIT                     (1<<1)  /* Use BigLineChanges   */
  26 #define PCHGF_USE_ALPHA         (1<<2)  /* Meaningful only of PCHGB_32BIT is on: use the Alpha
  27                                                                                                         channel info */
  28
  29 /* Structures for the PCHG chunk */
  30
  31 struct PCHGHeader {
  32    UWORD Compression;
  33    UWORD Flags;
  34    WORD  StartLine;
  35    UWORD LineCount;
  36    UWORD ChangedLines;
  37    UWORD MinReg;
  38    UWORD MaxReg;
  39    UWORD MaxChanges;
  40    ULONG TotalChanges;
  41 };
  42
  43 struct PCHGCompHeader {
  44    ULONG CompInfoSize;
  45    ULONG OriginalDataSize;
  46 };
  47
  48 struct SmallLineChanges {
  49    UBYTE ChangeCount16;
  50    UBYTE ChangeCount32;
  51 /*   UWORD PaletteChange[];*/
  52 };
  53
  54 struct BigLineChanges {
  55    UWORD ChangeCount;
  56 /*   struct BigPaletteChange PaletteChange[];*/
  57 };
  58
  59 struct BigPaletteChange {
  60    UWORD Register;
  61    UBYTE Alpha, Red, Blue, Green;
  62 };
  63
  64 /* Errors */
  65
  66 #define PCHGERR_NOMEM                   (-1)
  67 #define PCHGERR_UNKNOWNCOMP     (-2)
  68
  69 VOID __regargs PCHG_CFastDecomp(APTR Source, APTR Dest, WORD *TreeCode, ULONG OriginalSize);
  70 UBYTE *__regargs PCHG_CompHuffmann(APTR Source, ULONG SourceSize, ULONG *DataSize, ULONG *TreeSize);
  71 VOID __regargs PCHG_SetUserCopList(WORD Offset, UWORD Length, struct ViewPort *ViewPort, struct PCHGHeader *PCHG, APTR LineMask, APTR LineData);
  72 LONG __regargs PCHG_ParsePCHG(struct PCHGHeader *PCHG, struct ViewPort *ViewPort);
  73 struct PCHGHeader *__regargs PCHG_SHAM2PCHG(UWORD *SHAMChunk, ULONG SHAMSize, WORD Increment);
  74
  75 #endif