il_rle.h
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上传日期:2022-05-02
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- //-----------------------------------------------------------------------------
- //
- // ImageLib Sources
- // Copyright (C) 2000-2002 by Denton Woods
- // Last modified: 05/25/2001 <--Y2K Compliant! =]
- //
- // Filename: src-IL/include/il_rle.h
- //
- // Description: Functions for run-length encoding
- //
- //-----------------------------------------------------------------------------
- #ifndef RLE_H
- #define RLE_H
- #include "il_internal.h"
- #define TGA_MAX_RUN 128
- #define SGI_MAX_RUN 127
- #define BMP_MAX_RUN 127
- #ifdef IL_RLE_C
- #undef NOINLINE
- #undef INLINE
- #define INLINE
- #endif
- #ifndef NOINLINE
- INLINE ILuint GetPix(ILubyte *p, ILuint bpp) {
- ILuint Pixel;
- Pixel = (ILuint)*p++;
-
- while( bpp-- > 1 ) {
- Pixel <<= 8;
- Pixel |= (ILuint)*p++;
- }
- return Pixel;
- }
- INLINE ILint CountDiffPixels(ILubyte *p, ILuint bpp, ILuint pixCnt) {
- ILuint pixel;
- ILuint nextPixel = 0;
- ILint n;
- n = 0;
- if (pixCnt == 1)
- return pixCnt;
- pixel = GetPix(p, bpp);
- while (pixCnt > 1) {
- p += bpp;
- nextPixel = GetPix(p, bpp);
- if (nextPixel == pixel)
- break;
- pixel = nextPixel;
- ++n;
- --pixCnt;
- }
- if (nextPixel == pixel)
- return n;
- return n + 1;
- }
- INLINE ILint CountSamePixels(ILubyte *p, ILuint bpp, ILuint pixCnt) {
- ILuint pixel;
- ILuint nextPixel;
- ILint n;
- n = 1;
- pixel = GetPix(p, bpp);
- pixCnt--;
- while (pixCnt > 0) {
- p += bpp;
- nextPixel = GetPix(p, bpp);
- if (nextPixel != pixel)
- break;
- ++n;
- --pixCnt;
- }
- return n;
- }
- #endif
- ILuint GetPix(ILubyte *p, ILuint bpp);
- ILint CountDiffPixels(ILubyte *p, ILuint bpp, ILuint pixCnt);
- ILint CountSamePixels(ILubyte *p, ILuint bpp, ILuint pixCnt);
- #endif//RLE_H