fblin16.c

神龙卡开发原代码

/*
 * Copyright (c) 1999, 2000, 2001 Greg Haerr <[e-mail]>
 *
 * 16bpp Linear Video Driver for Microwindows
 *
 * Inspired from Ben Pfaff's BOGL <[e-mail]>
 */
/*#define NDEBUG*/
#include <assert.h>
#include <stdlib.h>

/* We want to do string copying fast, so inline assembly if possible */
#ifndef __OPTIMIZE__
#define __OPTIMIZE__
#endif
#include <string.h>

#include "device.h"
#include "fb.h"

#define USE_DRAWAREA	 0	/* =1 to implement temp removed DrawArea code*/
#define USE_16BIT_ACCESS 0	/* =1 to force 16 bit display access*/

#if USE_16BIT_ACCESS
#define memcpy(d,s,nbytes)	memcpy16(d,s,(nbytes)>>1)
#define memmove(d,s,nbytes)	memcpy16(d,s,(nbytes)>>1)
static void
memcpy16(unsigned short *dst, unsigned short *src, int nwords)
{
	while (--nwords >= 0)
		*dst++ = *src++;
}
#endif

/* Calc linelen and mmap size, return 0 on fail*/
static int
linear16_init(PSD psd)
{
	if (!psd->size) {
		psd->size = psd->yres * psd->linelen;
		/* convert linelen from byte to pixel len for bpp 16, 24, 32*/
		psd->linelen /= 2;
	}
	return 1;
}

/* Set pixel at x, y, to pixelval c*/
static void
linear16_drawpixel(PSD psd, MWCOORD x, MWCOORD y, MWPIXELVAL c)
{
	ADDR16	addr = psd->addr;

	assert (addr != 0);
	assert (x >= 0 && x < psd->xres);
	assert (y >= 0 && y < psd->yres);
	assert (c < psd->ncolors);

	DRAWON;
	if(gr_mode == MWMODE_COPY)
		addr[x + y * psd->linelen] = c;
	else
		applyOp(gr_mode, c, &addr[x + y * psd->linelen], ADDR16);
	DRAWOFF;
}

/* Read pixel at x, y*/
static MWPIXELVAL
linear16_readpixel(PSD psd, MWCOORD x, MWCOORD y)
{
	ADDR16	addr = psd->addr;

	assert (addr != 0);
	assert (x >= 0 && x < psd->xres);
	assert (y >= 0 && y < psd->yres);

	return addr[x + y * psd->linelen];
}

/* Draw horizontal line from x1,y to x2,y including final point*/
static void
linear16_drawhorzline(PSD psd, MWCOORD x1, MWCOORD x2, MWCOORD y, MWPIXELVAL c)
{
	ADDR16	addr = psd->addr;

	assert (addr != 0);
	assert (x1 >= 0 && x1 < psd->xres);
	assert (x2 >= 0 && x2 < psd->xres);
	assert (x2 >= x1);
	assert (y >= 0 && y < psd->yres);
	assert (c < psd->ncolors);

	DRAWON;
	addr += x1 + y * psd->linelen;
	if(gr_mode == MWMODE_COPY) {
		/* FIXME: memsetw(dst, c, x2-x1+1)*/
		while(x1++ <= x2)
			*addr++ = c;
	} else {
		while (x1++ <= x2) {
			applyOp(gr_mode, c, addr, ADDR16);
			++addr;
		}
	}
	DRAWOFF;
}

/* Draw a vertical line from x,y1 to x,y2 including final point*/
static void
linear16_drawvertline(PSD psd, MWCOORD x, MWCOORD y1, MWCOORD y2, MWPIXELVAL c)
{
	ADDR16	addr = psd->addr;
	int	linelen = psd->linelen;

	assert (addr != 0);
	assert (x >= 0 && x < psd->xres);
	assert (y1 >= 0 && y1 < psd->yres);
	assert (y2 >= 0 && y2 < psd->yres);
	assert (y2 >= y1);
	assert (c < psd->ncolors);

	DRAWON;
	addr += x + y1 * linelen;
	if(gr_mode == MWMODE_COPY) {
		while(y1++ <= y2) {
			*addr = c;
			addr += linelen;
		}
	} else {
		while (y1++ <= y2) {
			applyOp(gr_mode, c, addr, ADDR16);
			addr += linelen;
		}
	}
	DRAWOFF;
}

/* srccopy bitblt*/
static void
linear16_blit(PSD dstpsd, MWCOORD dstx, MWCOORD dsty, MWCOORD w, MWCOORD h,
	PSD srcpsd, MWCOORD srcx, MWCOORD srcy, long op)
{
	ADDR16	dst = dstpsd->addr;
	ADDR16	src = srcpsd->addr;
	int	i;
	int	dlinelen = dstpsd->linelen;
	int	slinelen = srcpsd->linelen;
#if ALPHABLEND
	unsigned int alpha;
#endif

	assert (dst != 0);
	assert (dstx >= 0 && dstx < dstpsd->xres);
	assert (dsty >= 0 && dsty < dstpsd->yres);
	assert (w > 0);
	assert (h > 0);
	assert (src != 0);
	assert (srcx >= 0 && srcx < srcpsd->xres);
	assert (srcy >= 0 && srcy < srcpsd->yres);
	assert (dstx+w <= dstpsd->xres);
	assert (dsty+h <= dstpsd->yres);
	assert (srcx+w <= srcpsd->xres);
	assert (srcy+h <= srcpsd->yres);

	DRAWON;
	dst += dstx + dsty * dlinelen;
	src += srcx + srcy * slinelen;

#if ALPHABLEND
	if((op & MWROP_EXTENSION) != MWROP_BLENDCONSTANT)
		goto stdblit;
	alpha = op & 0xff;

	if (dstpsd->pixtype == MWPF_TRUECOLOR565) {
		while(--h >= 0) {
			for(i=0; i<w; ++i) {
				unsigned int s = *src++;
				unsigned int d = *dst;
				unsigned int t = d & 0xf800;
				unsigned int m1, m2, m3;
				m1 = (((((s & 0xf800) - t)*alpha)>>8) & 0xf800) + t;
				t = d & 0x07e0;
				m2 = (((((s & 0x07e0) - t)*alpha)>>8) & 0x07e0) + t;
				t = d & 0x001f;
				m3 = (((((s & 0x001f) - t)*alpha)>>8) & 0x001f) + t;
				*dst++ = m1 | m2 | m3;
			}
			dst += dlinelen - w;
			src += slinelen - w;
		}
	} else {
		/* 5/5/5 format*/
		while(--h >= 0) {
			for(i=0; i<w; ++i) {
				unsigned int s = *src++;
				unsigned int d = *dst;
				unsigned int t = d & 0x7c00;
				unsigned int m1, m2, m3;
				m1 = (((((s & 0x7c00) - t)*alpha)>>8) & 0x7c00) + t;
				t = d & 0x03e0;
				m2 = (((((s & 0x03e0) - t)*alpha)>>8) & 0x03e0) + t;
				t = d & 0x001f;
				m3 = (((((s & 0x001f) - t)*alpha)>>8) & 0x001f) + t;
				*dst++ = m1 | m2 | m3;
			}
			dst += dlinelen - w;
			src += slinelen - w;
		}
	}
	DRAWOFF;
	return;
stdblit:
#endif

	if (op == MWROP_COPY) {
		/* copy from bottom up if dst in src rectangle*/
		/* memmove is used to handle x case*/
		if (srcy < dsty) {
			src += (h-1) * slinelen;
			dst += (h-1) * dlinelen;
			slinelen *= -1;
			dlinelen *= -1;
		}
		while (--h >= 0) {
			/* a _fast_ memcpy is a _must_ in this routine*/
			memmove(dst, src, w<<1);
			dst += dlinelen;
			src += slinelen;
		}
	} else {
		while (--h >= 0) {
			for (i=0; i<w; i++) {
				applyOp(MWROP_TO_MODE(op), *src, dst, ADDR16);
				++src;
				++dst;
			}
			dst += dlinelen - w;
			src += slinelen - w;
		}
	}
	DRAWOFF;
}

/* VERY experimental globals for debugging stretchblit off-by-some bug*/
extern int g_row_inc, g_col_inc;

/* srccopy stretchblt*/
static void
linear16_stretchblit(PSD dstpsd, MWCOORD dstx, MWCOORD dsty, MWCOORD dstw,
	MWCOORD dsth, PSD srcpsd, MWCOORD srcx, MWCOORD srcy, MWCOORD srcw,
	MWCOORD srch, long op)
{
	ADDR16	dst;
	ADDR16	src;
	int	dlinelen = dstpsd->linelen;
	int	slinelen = srcpsd->linelen;
	int	i, ymax;
	int	row_pos, row_inc;
	int	col_pos, col_inc;
	unsigned short pixel = 0;

	assert (dstpsd->addr != 0);
	assert (dstx >= 0 && dstx < dstpsd->xres);
	assert (dsty >= 0 && dsty < dstpsd->yres);
	assert (dstw > 0);
	assert (dsth > 0);
	assert (srcpsd->addr != 0);
	assert (srcx >= 0 && srcx < srcpsd->xres);
	assert (srcy >= 0 && srcy < srcpsd->yres);
	assert (srcw > 0);
	assert (srch > 0);
	assert (dstx+dstw <= dstpsd->xres);
	assert (dsty+dsth <= dstpsd->yres);
	assert (srcx+srcw <= srcpsd->xres);
	assert (srcy+srch <= srcpsd->yres);

	DRAWON;
	row_pos = 0x10000;
if (g_row_inc) row_inc = g_row_inc; else
	row_inc = (srch << 16) / dsth;

	/* stretch blit using integer ratio between src/dst height/width*/
	for (ymax = dsty+dsth; dsty<ymax; ++dsty) {

		/* find source y position*/
		while (row_pos >= 0x10000L) {
			++srcy;
			row_pos -= 0x10000L;
		}

		dst = (ADDR16)dstpsd->addr + dstx + dsty*dlinelen;
		src = (ADDR16)srcpsd->addr + srcx + (srcy-1)*slinelen;

		/* copy a row of pixels*/
		col_pos = 0x10000;
if (g_col_inc) col_inc = g_col_inc; else
		col_inc = (srcw << 16) / dstw;
		for (i=0; i<dstw; ++i) {
			/* get source x pixel*/
			while (col_pos >= 0x10000L) {
				pixel = *src++;
				col_pos -= 0x10000L;
			}
			*dst++ = pixel;
			col_pos += col_inc;
		}

		row_pos += row_inc;
	}
	DRAWOFF;
}

#if USE_DRAWAREA
/* temporarily removed DrawArea entry point code*/
static void init_alpha_lookup(unsigned short **low, unsigned short **high)
{
        unsigned short a, x, *lo, *hi;
        unsigned short r, g, b;
        unsigned short idx;

        lo = *low = malloc(32*256*2);
        hi = *high = malloc(32*256*2);

	if ( hi == 0 || lo == 0 )
		exit(17);