texture.h

边缘检测原代码. 边缘检测原代码.

/*
 * read_texture() - read in an image file in SGI 'libimage' format
 * 	currently its very simple minded and converts all images
 *      to RGBA8 regardless of the input format and returns the
 *	original number of components in the appropriate parameter.
 *    
 *  常规的.rgb文件结构是：
 *       前面12字节是有关总体信息
 *       除前512字节外，后面的字节是
 *             rrr ... ...
 *             ggg ... ...
 *             bbb ... ...
 *             aaa ... ...
 *     
 *	the components are converted as follows
 *		L    -> LLL 1.0
 *		LA   -> LLL A
 *		RGB  -> RGB 1.0
 *		RGBA -> RGB A
 *
 */

#ifndef _TEXTURE_
#define _TEXTURE_

typedef struct _ImageRec {
    unsigned short imagic;
    unsigned short type;
    unsigned short dim;
    unsigned short xsize, ysize, zsize;
    unsigned int min, max;
    unsigned int wasteBytes;
    char name[80];
    unsigned long colorMap;
    FILE *file;
    unsigned char *tmp;
    unsigned long rleEnd;
    unsigned int *rowStart;
    int *rowSize;
} ImageRec;

class CTexture
{
public:
	CTexture();
	~CTexture();
protected:
	unsigned char*base;
    unsigned char *rbuf, *gbuf, *bbuf, *abuf;
    ImageRec *image;
public:
	unsigned char*read_texture(char *name, int *width, int *height, int *components);
protected:
	void bwtorgba(unsigned char *b,unsigned char *l,int n);
	void latorgba(unsigned char *b, unsigned char *a,unsigned char *l,int n);
	void rgbtorgba(unsigned char *r,unsigned char *g,unsigned char *b,unsigned char *l,int n);
	void rgbtorgb(unsigned char *r,unsigned char *g,unsigned char *b,unsigned char *l,int n);
	void rgbatorgba(unsigned char *r,unsigned char *g,unsigned char *b,unsigned char *a,unsigned char *l,int n);
	void ConvertShort(unsigned short *array, long length);
	void ConvertLong(unsigned *array, long length);
	ImageRec *ImageOpen(const char *fileName);
	void ImageClose();
	void ImageGetRow(unsigned char *buf, int y, int z);
};
#endif