/*
 * Copyright (c) 2000, 2002, 2003 Greg Haerr <greg@censoft.com>
 *
 * Nano-X Client utility routines
 *
 * These routines are Gr* functionality without requiring new API entry points.
 */
#include <stdio.h>
#include <stdlib.h>
#define MWINCLUDECOLORS
#include "nano-X.h"
#include "device.h"

/*
 * Create new window with passed style, title and location.
 */
GR_WINDOW_ID
GrNewWindowEx(GR_WM_PROPS props, GR_CHAR * title, GR_WINDOW_ID parent,
	      GR_COORD x, GR_COORD y, GR_SIZE width, GR_SIZE height,
	      GR_COLOR background)
{
	GR_WINDOW_ID wid;
	GR_WM_PROPERTIES wmprops;

	/* create window with no borders */
	wid = GrNewWindow(parent, x, y, width, height, 0, background, BLACK);
	if (wid) {
		/* set properties and title */
		wmprops.flags = GR_WM_FLAGS_PROPS | GR_WM_FLAGS_TITLE;
		wmprops.props = props;
		wmprops.title = title;
		GrSetWMProperties(wid, &wmprops);
	}
	return wid;
}

/* draw an array of lines */
void
GrDrawLines(GR_DRAW_ID w, GR_GC_ID gc, GR_POINT * points, GR_COUNT count)
{
	GR_POINT beg, end;

	if (count < 1)
		return;
	if (count == 1) {
		GrPoint(w, gc, points->x, points->y);
		return;
	}

	beg = *points++;
	while (--count > 0) {
		end = *points++;
		GrLine(w, gc, beg.x, beg.y, end.x, end.y);
		beg = end;
	}
}

/*
 * Retrofit routine.  Use GrNewCursor and GrSetWindowCursor for new code.
 */
GR_CURSOR_ID
GrSetCursor(GR_WINDOW_ID wid, GR_SIZE width, GR_SIZE height, GR_COORD hotx,
	    GR_COORD hoty, GR_COLOR foreground, GR_COLOR background,
	    GR_BITMAP * fgbitmap, GR_BITMAP * bgbitmap)
{
	GR_CURSOR_ID cid;

	cid = GrNewCursor(width, height, hotx, hoty, foreground,
			  background, fgbitmap, bgbitmap);
	if (cid)
		GrSetWindowCursor(wid, cid);
	return cid;
}

/* byte-reversing table for reversing X bitmaps */
static unsigned char revbyte[256] = {
	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};

/*
 * Create a GdBitmap-compatible bitmap (16-bit short array) from data bits
 *     flags specify input format
 *     caller must free return buffer
 *
 * Currently only works if width/height < bits_width/bits_height
 */
GR_BITMAP *
GrNewBitmapFromData(GR_SIZE width, GR_SIZE height, GR_SIZE bits_width,
	GR_SIZE bits_height, void *bits, int flags)
{
	int x, y;
	int xb;
	int brev = flags & GR_BMDATA_BYTEREVERSE;
	int bswap = flags & GR_BMDATA_BYTESWAP;
	unsigned char *inbuf = bits;
	unsigned char *p;
	GR_BITMAP *buf;

	/* 
	 * bit reverse or byte-swap short words in image
	 * and pad to 16 bits for GrBitmap()
	 */
	xb = (width + 7) / 8;	/* FIXME: may not be in packed-8bit format */
	buf = (GR_BITMAP *) malloc(((xb + 1) & ~01) * height);
	if (!buf)
		return NULL;


	p = (unsigned char *) buf;

	for (y = 0; y < height; ++y) {
		for (x = 0; x < xb;) {

			/* This handles the situation where we may not be 16 byte aligned */

			if ((xb - x) == 1) {
				unsigned char c = *inbuf++;
				*p++ = brev ? revbyte[c] : c;
				x++;
			} else {
				if (bswap) {
					/* byte-swap short words */
					unsigned char c = *inbuf++;
					p[1] = brev ? revbyte[c] : c;
					if (x < xb - 1) {
						c = *inbuf++;
						p[0] = brev ? revbyte[c] : c;
					} else
						p[0] = 0;
				} else {
					/* no byte swapping */
					unsigned char c = *inbuf++;
					p[0] = brev ? revbyte[c] : c;
					if (x < xb - 1) {
						c = *inbuf++;
						p[1] = brev ? revbyte[c] : c;
					} else
						p[1] = 0;
				}

				x += 2;
				p += 2;
			}
		}
		inbuf += (bits_width + 7) / 8 - (width + 7) / 8;	/* FIXME */

		/* pad to 16 bits */
		if (xb & 1)
			*p++ = 0;
	}
	return buf;
}

/*
 * Create a new pixmap and initialize from bitmap data and fg/bg colors
 */
GR_WINDOW_ID
GrNewPixmapFromData(GR_SIZE width, GR_SIZE height, GR_COLOR foreground,
	GR_COLOR background, void *bits, int flags)
{
	GR_WINDOW_ID pid;
	GR_GC_ID gc;
	GR_BITMAP *buf;

	pid = GrNewPixmap(width, height, NULL);
	if (pid) {
		gc = GrNewGC();
		GrSetGCForeground(gc, foreground);
		GrSetGCBackground(gc, background);

		buf = GrNewBitmapFromData(width, height, width, height,
					    bits, flags);
		if (buf) {
			GrBitmap(pid, gc, 0, 0, width, height, buf);
			free(buf);
		}
		GrDestroyGC(gc);
	}
	return pid;
}

/*
 * Create a bitmap from a specified pixmap 
 * This function may not be needed if Microwindows implemented a depth-1 pixmap.
 */
GR_BITMAP *
GrNewBitmapFromPixmap(GR_WINDOW_ID pixmap, MWCOORD x, MWCOORD y,
	GR_SIZE width, GR_SIZE height)
{
	unsigned int w, h;
	unsigned int bwidth, rowsize;
	GR_PIXELVAL *pixel, *buffer;
	GR_BITMAP *bitmap;

	buffer = malloc(width * height * sizeof(GR_PIXELVAL));
	if (!buffer)
		return NULL;

	bwidth = (width + 15) / 16;
	rowsize = sizeof(GR_BITMAP) * ((bwidth + 1) & ~01);
	bitmap = (GR_BITMAP *) calloc(rowsize, height);
	if (!bitmap) {
		free(buffer);
		return NULL;
	}

	/* Now, read the pixmap and set bitmap bit if pixel non-zero */
	GrReadArea(pixmap, x, y, width, height, (void *) buffer);

	pixel = buffer;
	for (h = 0; h < height; h++) {
		for (w = 0; w < width; w++) {
			if (*pixel++)
				bitmap[(h * bwidth) + (w >> 4)] |=
					(1 << (15 - (w % 16)));
		}
	}
	free(buffer);
	return bitmap;
}

/*
 * Create a region from a monochrome pixmap
 */
GR_REGION_ID
GrNewRegionFromPixmap(GR_WINDOW_ID src, MWCOORD x, MWCOORD y, GR_SIZE width,
	GR_SIZE height)
{
	int w, h;
	int mx, my, mw, mh;
	GR_REGION_ID r;
	GR_PIXELVAL *pixel;
	GR_PIXELVAL *buffer;
	GR_WINDOW_INFO winfo;

	if (!src)
		return 0;

	/* read pixmap into local buffer */
	GrGetWindowInfo(src, &winfo);
	buffer = ALLOCA(winfo.width * winfo.height * sizeof(GR_PIXELVAL));
	if (!buffer)
		return 0;
	GrReadArea(src, 0, 0, winfo.width, winfo.height, buffer);

	/* build region from pixmap data */
	r = GrNewRegion();
	pixel = buffer;
	mx = MWMIN(0, x);
	my = MWMIN(0, y);
	mw = MWMIN(winfo.width, width);
	mh = MWMIN(winfo.height, height);
	for (h = my; h < mh; h++) {
		int state = 0;
		GR_RECT local;

		for (w = mx; w < mw; w++) {
			if (*pixel++) {
				if (state != 0)
					continue;

				local.x = w;
				local.y = h;
				local.height = 1;
				state = 1;
			} else {
				if (state == 0)
					continue;

				local.width = (w - local.x);
				GrUnionRectWithRegion(r, &local);
				state = 0;
			}
		}

		if (state != 0) {
			local.width = ((winfo.width - 1) - local.x);
			GrUnionRectWithRegion(r, &local);
		}
	}
	FREEA(buffer);

	return r;
}