refresh.h

日本的手持pda源码.wince下使用,完全开源

#ifndef __REFRESH_H__
#define __REFRESH_H__

#ifdef __cplusplus
extern "C" {
#endif

extern unsigned char *screenvram;
extern int screenpitchx;
extern int screenpitchy;
extern int screenmode;

INLINE void refresh_2(un16 *dest, byte *src, un16 *pal, int cnt)
{
	int i;
	un16 *pixel, *pixel2;

	if (screenmode == 1) { // 240 x 216
		cnt >>= 2;
		pixel = (un16 *) (screenvram + screenpitchy * ((scan.l * 3) >> 1));
		if (scan.l & 0x1) {		
			pixel2 = pixel + (screenpitchy >> 1);
			for (i = 0; i < cnt; i++) {
				*(pixel) = *(pixel2) = pal[*(src)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = *(pixel2) = pal[*(src++)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = *(pixel2) = pal[*(src++)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = *(pixel2) = pal[*(src++)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = *(pixel2) = pal[*(src)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = *(pixel2) = pal[*(src++)];
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;
			}
		}
		else {
			for (i = 0; i < cnt; i++) {
				*(pixel) = pal[*(src)];
				(pixel) += screenpitchx;
				*(pixel) = pal[*(src++)];
				(pixel) += screenpitchx;
				*(pixel) = pal[*(src++)];
				(pixel) += screenpitchx;

				*(pixel) = pal[*(src++)];
				(pixel) += screenpitchx;
				*(pixel) = pal[*(src)];
				(pixel) += screenpitchx;
				*(pixel) = pal[*(src++)];
				(pixel) += screenpitchx;
			}
		}
	} else if (screenmode == 2) { // 240 x 216 (half antialiasing)
		static un16 p0, p1, p01;
		cnt >>= 1;
		pixel = (un16 *) (screenvram + screenpitchy * ((scan.l * 3) >> 1));
		for (i = 0; i < cnt; i++) {
			/* Plot three pixels
			 * [p0] <p01> [p1]
			 * where p01 is calculated from the average of 
			 * p0 and p1
			 */

			p0 = pal[*(src++)];
			p1 = pal[*(src++)];
			

			*(pixel) = p0;
			(pixel) += screenpitchx;
			*(pixel) =	((((p0 & 0xf800) + (p1 & 0xf800)) >> 1) & 0xf800) |
						((((p0 & 0x07e0) + (p1 & 0x07e0)) >> 1) & 0x07e0) |
						(((p0 & 0x001f) + (p1 & 0x001f)) >> 1);
			(pixel) += screenpitchx;
			*(pixel) = p1;
			(pixel) += screenpitchx;
		}

		if (scan.l & 0x1) {
			pixel = (un16 *) (screenvram + screenpitchy * ((scan.l * 3) >> 1));
			memcpy(pixel + (screenpitchy >> 1), pixel, 240 * 2);
		}
	} else if (screenmode == 3) { // 240 x 216 (antialiasing)
		/* "mean"/"average" effect */		
		cnt >>= 1;
		pixel = (un16 *) (screenvram + screenpitchy * ((scan.l * 3) >> 1));
		if (scan.l & 0x1) {
			un16 p00, p01, p02;
			un16 p10, p11, p12;
			un16 p20, p21, p22;
			un16 r20, g20, b20;
			un16 r22, g22, b22;
			for (i = 0; i < cnt; i++) {
				/* plot six pixels
				 * [p00] <p01> [p02]
				 * >p10< >p11< >p12<
				 * [p20] >p21< [p22]
				 */

				un16 *pixel0 = pixel - (screenpitchy >> 1);
				un16 *pixel2 = pixel + (screenpitchy >> 1);

				p00 = *pixel0;
				p01 = *(pixel0 + screenpitchx);
				p02 = *(pixel0 + 2*screenpitchx);

				p20 = pal[*(src++)];
				p22 = pal[*(src++)];

				r20 = p20 & 0xf800;
				g20 = p20 & 0x07e0;
				b20 = p20 & 0x001f;

				r22 = p22 & 0xf800;
				g22 = p22 & 0x07e0;
				b22 = p22 & 0x001f;

				p21 =	(((r20 + r22) >> 1) & 0xf800) |
						(((g20 + g22) >> 1) & 0x07e0) |
						((b20 + b22) >> 1);

				p10 =	(((r20 + (p00 & 0xf800)) >> 1) & 0xf800) |
						(((g20 + (p00 & 0x07e0)) >> 1) & 0x07e0) |
						((b20 + (p00 & 0x001f)) >> 1);

				p12=	((((p02 & 0xf800) + r22) >> 1) & 0xf800) |
						((((p02 & 0x07e0) + g22) >> 1) & 0x07e0) |
						(((p02 & 0x001f) + b22) >> 1);

				p11=	((((p01 & 0xf800) + (p21 & 0xf800)) >> 1) & 0xf800) |
						((((p01 & 0x07e0) + (p21 & 0x07e0)) >> 1) & 0x07e0) |
						(((p01 & 0x001f) + (p21 & 0x001f)) >> 1);
				
				*(pixel) = p10;
				*(pixel2) = p20;
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = p11;
				*(pixel2) = p21;
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;

				*(pixel) = p12;
				*(pixel2) = p22;
				(pixel) += screenpitchx;
				(pixel2) += screenpitchx;
			}
		}
		else {
			static un16 p0, p1, p01;
			for (i = 0; i < cnt; i++) {
				/* Plot three pixels
				 * [p0] <p01> [p1]
				 * where p01 is calculated from the average of 
				 * p0 and p1
				 */

				p0 = pal[*(src++)];
				p1 = pal[*(src++)];
				

				*(pixel) = p0;
				(pixel) += screenpitchx;
				*(pixel) =	((((p0 & 0xf800) + (p1 & 0xf800)) >> 1) & 0xf800) |
							((((p0 & 0x07e0) + (p1 & 0x07e0)) >> 1) & 0x07e0) |
							(((p0 & 0x001f) + (p1 & 0x001f)) >> 1);
				(pixel) += screenpitchx;
				*(pixel) = p1;
				(pixel) += screenpitchx;
			}
		} 
	}
	else { // 160 x 144
		pixel = (un16 *) (screenvram + screenpitchy * scan.l);
		for (i = 0; i < cnt; i++) {
			*(pixel) = pal[*(src++)];
			(pixel) += screenpitchx;
		}
	}
}

#ifdef __cplusplus
}
#endif

#endif // __REFRESH_H__