xm_image.h

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/**************************************************************************

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
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/*
 * Authors:
 *   Kevin E. Martin <[e-mail]>
 *   Brian Paul <[e-mail]>
 */

#ifndef _XM_IMAGE_H_
#define _XM_IMAGE_H_

#define XMESA_USE_PUTPIXEL_MACRO

extern XMesaImage *XMesaCreateImage(int bitsPerPixel, int width, int height,
				    char *data);
extern void XMesaDestroyImage(XMesaImage *image);
extern unsigned long XMesaGetPixel(XMesaImage *image, int x, int y);
#ifdef XMESA_USE_PUTPIXEL_MACRO
#define XMesaPutPixel(__i,__x,__y,__p) \
{ \
    CARD8  *__row = (CARD8 *)(__i->data + __y*__i->bytes_per_line); \
    CARD8  *__i8; \
    CARD16 *__i16; \
    CARD32 *__i32; \
    switch (__i->bits_per_pixel) { \
    case 8: \
	__i8 = (CARD8 *)__row; \
	__i8[__x] = (CARD8)__p; \
	break; \
    case 15: \
    case 16: \
	__i16 = (CARD16 *)__row; \
	__i16[__x] = (CARD16)__p; \
	break; \
    case 24: /* WARNING: architecture specific code */ \
	__i8 = (CARD8 *)__row; \
	__i8[__x*3]   = (CARD8)(__p); \
	__i8[__x*3+1] = (CARD8)(__p>>8); \
	__i8[__x*3+2] = (CARD8)(__p>>16); \
	break; \
    case 32: \
	__i32 = (CARD32 *)__row; \
	__i32[__x] = (CARD32)__p; \
	break; \
    } \
}
#else
extern void XMesaPutPixel(XMesaImage *image, int x, int y,
			  unsigned long pixel);
#endif

#endif /* _XM_IMAGE_H_ */