devrgn.c

the embedded GUI for SamSung s3c2410 cpu based board.is microwindows0.90

/*
 * Portions Copyright (c) 1999, 2000 Greg Haerr <[e-mail]>
 *	Somewhat less shamelessly ripped from the Wine distribution
 *
 * Device-independent multi-rectangle clipping routines.
 *
 * GDI region objects. Shamelessly ripped out from the X11 distribution
 * Thanks for the nice licence.
 *
 * Copyright 1993, 1994, 1995 Alexandre Julliard
 * Modifications and additions: Copyright 1998 Huw Davies
 */
/* **********************************************************************

Copyright (c) 1987, 1988  X Consortium

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Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

			All Rights Reserved

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************************************************************************/
/*
 * The functions in this file implement the Region abstraction, similar to one
 * used in the X11 sample server. A Region is simply an area, as the name
 * implies, and is implemented as a "y-x-banded" array of rectangles. To
 * explain: Each Region is made up of a certain number of rectangles sorted
 * by y coordinate first, and then by x coordinate.
 *
 * Furthermore, the rectangles are banded such that every rectangle with a
 * given upper-left y coordinate (y1) will have the same lower-right y
 * coordinate (y2) and vice versa. If a rectangle has scanlines in a band, it
 * will span the entire vertical distance of the band. This means that some
 * areas that could be merged into a taller rectangle will be represented as
 * several shorter rectangles to account for shorter rectangles to its left
 * or right but within its "vertical scope".
 *
 * An added constraint on the rectangles is that they must cover as much
 * horizontal area as possible. E.g. no two rectangles in a band are allowed
 * to touch.
 *
 * Whenever possible, bands will be merged together to cover a greater vertical
 * distance (and thus reduce the number of rectangles). Two bands can be merged
 * only if the bottom of one touches the top of the other and they have
 * rectangles in the same places (of the same width, of course). This maintains
 * the y-x-banding that's so nice to have...
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "device.h"

typedef void (*REGION_OverlapBandFunctionPtr) (MWCLIPREGION * pReg, MWRECT * r1,
    MWRECT * r1End, MWRECT * r2, MWRECT * r2End, MWCOORD top, MWCOORD bottom);
typedef void (*REGION_NonOverlapBandFunctionPtr) (MWCLIPREGION * pReg, MWRECT * r,
    MWRECT * end, MWCOORD top, MWCOORD bottom);

/*  1 if two RECTs overlap.
 *  0 if two RECTs do not overlap.
 */
#define EXTENTCHECK(r1, r2) \
	((r1)->right > (r2)->left && \
	 (r1)->left < (r2)->right && \
	 (r1)->bottom > (r2)->top && \
	 (r1)->top < (r2)->bottom)

/*
 *   Check to see if there is enough memory in the present region.
 */
#define MEMCHECK(reg, rect, firstrect){\
        if ((reg)->numRects >= ((reg)->size - 1)){\
          (firstrect) = GdRealloc(\
           (firstrect), ((sizeof(MWRECT)) * ((reg)->size)), \
           (2 * (sizeof(MWRECT)) * ((reg)->size)));\
          if ((firstrect) == 0)\
            return;\
          (reg)->size *= 2;\
          (rect) = &(firstrect)[(reg)->numRects];\
         }\
       }

#define REGION_NOT_EMPTY(pReg) pReg->numRects

#define EMPTY_REGION(pReg) { \
    (pReg)->numRects = 0; \
    (pReg)->extents.left = (pReg)->extents.top = 0; \
    (pReg)->extents.right = (pReg)->extents.bottom = 0; \
    (pReg)->type = MWREGION_NULL; \
 }

#define INRECT(r, x, y) \
      ( ( ((r).right >  x)) && \
        ( ((r).left <= x)) && \
        ( ((r).bottom >  y)) && \
        ( ((r).top <= y)) )

/**
 * return TRUE if point is in region
 *
 * @param rgn Region.
 * @param x X co-ordinate of point to check.
 * @param y Y co-ordinate of point to check.
 * @return TRUE iff point is in region
 */
MWBOOL
GdPtInRegion(MWCLIPREGION *rgn, MWCOORD x, MWCOORD y)
{
    int i;

    if (rgn->numRects > 0 && INRECT(rgn->extents, x, y))
	for (i = 0; i < rgn->numRects; i++)
	    if (INRECT (rgn->rects[i], x, y))
		return TRUE;
    return FALSE;
}

/**
 * return whether rectangle is all in, partly in, or out of region
 *
 * @param rgn Region.
 * @param rect Rectangle to check.
 * @return MWRECT_PARTIN, MWRECT_ALLIN, or MWRECT_OUT.
 */
int 
GdRectInRegion(MWCLIPREGION *rgn, const MWRECT *rect)
{
    MWRECT *	pCurRect;
    MWRECT *	pRectEnd;
    MWCOORD	rx, ry;
    MWBOOL	partIn, partOut;

    /* this is (just) a useful optimization */
    if (!rgn->numRects || !EXTENTCHECK(&rgn->extents, rect))
        return MWRECT_OUT;

    partOut = FALSE;
    partIn = FALSE;
    rx = rect->left;
    ry = rect->top;

    /* 
     * can stop when both partOut and partIn are TRUE,
     * or we reach rect->bottom
     */
    for (pCurRect = rgn->rects, pRectEnd = pCurRect + rgn->numRects;
		 pCurRect < pRectEnd; pCurRect++) {

	if (pCurRect->bottom <= ry)
	   continue;		/* not far enough down yet*/

	if (pCurRect->top > ry) {
	   partOut = TRUE;	/* missed part of rectangle above */
	   if (partIn || (pCurRect->top >= rect->bottom))
	      break;
	   ry = pCurRect->top;	/* x guaranteed to be == rect->left */
	}

	if (pCurRect->right <= rx)
	   continue;		/* not far enough over yet */

	if (pCurRect->left > rx) {
	   partOut = TRUE;	/* missed part of rectangle to left */
	   if (partIn)
	      break;
	}

	if (pCurRect->left < rect->right) {
	    partIn = TRUE;	/* definitely overlap */
	    if (partOut)
	       break;
	}

	if (pCurRect->right >= rect->right) {
	   ry = pCurRect->bottom;	/* finished with this band */
	   if (ry >= rect->bottom)
	      break;
	   rx = rect->left;	/* reset x out to left again */
	} else {
	    /*
	     * Because boxes in a band are maximal width, if the first box
	     * to overlap the rectangle doesn't completely cover it in that
	     * band, the rectangle must be partially out, since some of it
	     * will be uncovered in that band. partIn will have been set true
	     * by now...
	     */
	    break;
	}
    }

    return(partIn ? ((ry < rect->bottom) ? MWRECT_PARTIN : MWRECT_ALLIN) : 
		MWRECT_OUT);
}

#if 0000
/* Returns TRUE if rect is at least partly inside rgn*/
MWBOOL
GdRectInRegion(MWCLIPREGION *rgn, const MWRECT *rect)
{
    MWRECT *pCurRect, *pRectEnd;
    MWBOOL ret = FALSE;

    /* this is (just) a useful optimization */
	if ((rgn->numRects > 0) && EXTENTCHECK(&rgn->extents, rect))
	{
	    for (pCurRect = rgn->rects, pRectEnd = pCurRect +
	     rgn->numRects; pCurRect < pRectEnd; pCurRect++)
	    {
	        if (pCurRect->bottom <= rect->top)
			continue;             /* not far enough down yet */

		if (pCurRect->top >= rect->bottom) {
		    ret = FALSE;          /* too far down */
		    break;
		}

		if (pCurRect->right <= rect->left)
		    continue;              /* not far enough over yet */

		if (pCurRect->left >= rect->right) {
		    continue;
		}

		ret = TRUE;
		break;
	    }
	}
	return ret;
}
#endif

static MWBOOL
EQUALRECT(MWRECT *r1, MWRECT *r2)
{
	return ((r1->left == r2->left) && (r1->right == r2->right) &&
		(r1->top == r2->top) && (r1->bottom == r2->bottom));
}

/**
 * Test if two regions are identical.
 *
 * @param r1 First region.
 * @param r2 Second region.
 * @return TRUE iff the regions are exactly the same.
 */
MWBOOL
GdEqualRegion(MWCLIPREGION *r1, MWCLIPREGION *r2)
{
	int	i;

	if (r1->numRects != r2->numRects)
		return FALSE;
	if (r1->numRects == 0)
		return TRUE;
	if (!EQUALRECT(&r1->extents, &r2->extents))
		return FALSE;
	for (i = 0; i < r1->numRects; i++) {
		if (!EQUALRECT(r1->rects + i, r2->rects + i))
			return FALSE;
	}
	return TRUE;
}

/**
 * Test if a region is empty.
 *
 * @param rgn Region.
 * @return TRUE iff the region is empty.
 */
MWBOOL
GdEmptyRegion(MWCLIPREGION *rgn)
{
	return rgn->numRects == 0;
}

/**
 *            Create a new empty MWCLIPREGION.
 *
 * @return A new region.
 */
MWCLIPREGION *
GdAllocRegion(void)    
{
    MWCLIPREGION *rgn;

    if ((rgn = malloc(sizeof( MWCLIPREGION ))))
    {
	if ((rgn->rects = malloc(sizeof( MWRECT ))))
	{
	    rgn->size = 1;
	    EMPTY_REGION(rgn);
	    return rgn;
	}
	free(rgn);
    }
    return NULL;
}

/**
 * Create a new MWCLIPREGION which is a rectangular region.
 *
 * @param left Left edge of region.
 * @param top Top edge of region.
 * @param right Right edge of region.
 * @param bottom Bottom edge of region.
 * @return A new region.
 */
MWCLIPREGION *
GdAllocRectRegion(MWCOORD left, MWCOORD top, MWCOORD right, MWCOORD bottom)
{
	MWCLIPREGION *rgn;

	rgn = GdAllocRegion();
	if (rgn)
		GdSetRectRegion(rgn, left, top, right, bottom);
	return rgn;
}

/**
 * Create a new MWCLIPREGION which is a rectangular region.
 *
 * @param prc Rectangle defining the region.
 * @return A new region.
 */
MWCLIPREGION *
GdAllocRectRegionIndirect(MWRECT *prc)
{
	return GdAllocRectRegion(prc->left, prc->top, prc->right, prc->bottom);
}

/**
 * Redefine a region to be just a simple rectangular region.
 * The previous contents of the region are destroyed.
 *
 * @param rgn A region.
 * @param left Left edge of region.
 * @param top Top edge of region.
 * @param right Right edge of region.
 * @param bottom Bottom edge of region.
 */
void
GdSetRectRegion(MWCLIPREGION *rgn, MWCOORD left, MWCOORD top, MWCOORD right,
	MWCOORD bottom)
{
	if (left != right && top != bottom) {
		rgn->rects->left = rgn->extents.left = left;
		rgn->rects->top = rgn->extents.top = top;
		rgn->rects->right = rgn->extents.right = right;
		rgn->rects->bottom = rgn->extents.bottom = bottom;
		rgn->numRects = 1;
		rgn->type = MWREGION_SIMPLE;
	} else
		EMPTY_REGION(rgn);
}

/**
 * Redefine a region to be just a simple rectangular region.
 * The previous contents of the region are destroyed.
 *
 * @param rgn A region.
 * @param prc Rectangle defining the region.
 */
void
GdSetRectRegionIndirect(MWCLIPREGION *rgn, MWRECT *prc)
{
	GdSetRectRegion(rgn, prc->left, prc->top, prc->right, prc->bottom);
}

/**
 * Destroy a region.  Similar to free().
 *
 * @param rgn The region to destroy.
 */
void
GdDestroyRegion(MWCLIPREGION *rgn)
{
	if(rgn) {
		free(rgn->rects);
		free(rgn);
	}
}

/**
 * Translate a region by a specified offset.
 *
 * @param rgn The region to translate.
 * @param x The X offset.
 * @param y The Y offset.
 */
void
GdOffsetRegion(MWCLIPREGION *rgn, MWCOORD x, MWCOORD y)
{
	int	nbox = rgn->numRects;
	MWRECT *pbox = rgn->rects;

	if(nbox && (x || y)) {
		while(nbox--) {
			pbox->left += x;
			pbox->right += x;
			pbox->top += y;
			pbox->bottom += y;
			pbox++;
		}
		rgn->extents.left += x;
		rgn->extents.right += x;
		rgn->extents.top += y;
		rgn->extents.bottom += y;
	}
}

/**
 * get bounding box for region, return region type
 *
 * @param rgn The region to query.
 * @param prc On exit, contains the bounding box for the region.
 * @return The region type.  One of MWREGION_NULL (empty region),
 * MWREGION_SIMPLE (rectangular region), or MWREGION_COMPLEX (non-rectangular
 * region).
 */
int
GdGetRegionBox(MWCLIPREGION *rgn, MWRECT *prc)
{
	*prc = rgn->extents;
	return rgn->type;
}

/**
 *           Adds a rectangle to a MWCLIPREGION
 *
 * @param rect Rectangle to add to the region.
 * @param rgn The clip region to modify.
 */
void
GdUnionRectWithRegion(const MWRECT *rect, MWCLIPREGION *rgn)
{
    MWCLIPREGION region;

    region.rects = &region.extents;
    region.numRects = 1;
    region.size = 1;
    region.type = MWREGION_SIMPLE;
    region.extents = *rect;
    GdUnionRegion(rgn, rgn, &region);
}

/**
 *           Subtracts a rectangle from a MWCLIPREGION
 *
 * @param rect Rectangle to remove from the region.
 * @param rgn The clip region to modify.
 */
void
GdSubtractRectFromRegion(const MWRECT *rect, MWCLIPREGION *rgn)
{
    MWCLIPREGION region;

    region.rects = &region.extents;
    region.numRects = 1;
    region.size = 1;
    region.type = MWREGION_SIMPLE;
    region.extents = *rect;
    GdSubtractRegion(rgn, rgn, &region);
}


/**
 * Modify a region so that it is identical to another region.
 *
 * @param dst Region to copy to.
 * @param src Region to copy from.
 */
void
GdCopyRegion(MWCLIPREGION *dst, MWCLIPREGION *src)
{
    if (dst != src) /*  don't want to copy to itself */
    {  
	if (dst->size < src->numRects)
	{
	    if (! (dst->rects = GdRealloc( dst->rects, dst->numRects * sizeof(MWRECT), src->numRects * sizeof(MWRECT))))
		return;
	    dst->size = src->numRects;
	}
	dst->numRects = src->numRects;
	dst->extents.left = src->extents.left;
	dst->extents.top = src->extents.top;
	dst->extents.right = src->extents.right;
	dst->extents.bottom = src->extents.bottom;
	dst->type = src->type;