/*
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/*
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* Copyright (c) 2000 Greg Haerr <greg@censoft.com>
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* Copyright (c) 2000 Greg Haerr <greg@censoft.com>
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* Copyright (c) 1991 David I. Bell
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* Copyright (c) 1991 David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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* provided that this copyright notice remains intact.
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*
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*
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* DYNAMICREGIONS Device-independent routines to set clipping regions.
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* DYNAMICREGIONS Device-independent routines to set clipping regions.
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*/
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*/
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#include <stdio.h>
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#include <stdio.h>
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#include "device.h"
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#include "device.h"
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/* Clip cache rectangle information.
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/* Clip cache rectangle information.
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* After calling GdClipPoint, this rectangle is guaranteed to contain the
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* After calling GdClipPoint, this rectangle is guaranteed to contain the
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* specified point (among others), and all points in the rectangle are
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* specified point (among others), and all points in the rectangle are
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* plottable or not according to the value of clipresult.
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* plottable or not according to the value of clipresult.
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*/
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*/
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MWCOORD clipminx; /* minimum x value of cache rectangle */
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MWCOORD clipminx; /* minimum x value of cache rectangle */
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MWCOORD clipminy; /* minimum y value of cache rectangle */
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MWCOORD clipminy; /* minimum y value of cache rectangle */
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MWCOORD clipmaxx; /* maximum x value of cache rectangle */
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MWCOORD clipmaxx; /* maximum x value of cache rectangle */
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MWCOORD clipmaxy; /* maximum y value of cache rectangle */
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MWCOORD clipmaxy; /* maximum y value of cache rectangle */
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static MWBOOL clipresult; /* whether clip rectangle is plottable */
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static MWBOOL clipresult; /* whether clip rectangle is plottable */
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MWCLIPREGION *clipregion = NULL;
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MWCLIPREGION *clipregion = NULL;
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/*
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/*
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* Set a clip region for future drawing actions.
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* Set a clip region for future drawing actions.
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* Each pixel will be drawn only if lies in one or more of the contained
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* Each pixel will be drawn only if lies in one or more of the contained
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* clip rectangles. All clip rectangles are modified
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* clip rectangles. All clip rectangles are modified
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* if necessary to lie within the device area. Call only after device
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* if necessary to lie within the device area. Call only after device
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* has been initialized.
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* has been initialized.
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*/
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*/
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void
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void
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GdSetClipRegion(PSD psd, MWCLIPREGION *reg)
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GdSetClipRegion(PSD psd, MWCLIPREGION *reg)
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{
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{
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if(clipregion)
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if(clipregion)
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GdDestroyRegion(clipregion);
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GdDestroyRegion(clipregion);
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if(!reg)
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if(!reg)
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reg = GdAllocRegion();
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reg = GdAllocRegion();
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clipregion = reg;
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clipregion = reg;
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#if 0
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#if 0
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MWRECT rc;
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MWRECT rc;
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/* Copy the clip table to our own static array, modifying each
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/* Copy the clip table to our own static array, modifying each
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* rectangle as necesary to fit within the device area. If the clip
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* rectangle as necesary to fit within the device area. If the clip
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* rectangle lies entirely outside of the device area, then skip it.
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* rectangle lies entirely outside of the device area, then skip it.
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*/
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*/
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while (count-- > 0) {
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while (count-- > 0) {
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MWCLIPRECT cr;
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MWCLIPRECT cr;
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MWCLIPRECT *rp = &cr;
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MWCLIPRECT *rp = &cr;
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*rp = *table++;
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*rp = *table++;
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if (rp->x < 0) {
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if (rp->x < 0) {
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rp->width += rp->x;
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rp->width += rp->x;
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rp->x = 0;
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rp->x = 0;
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}
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}
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if (rp->y < 0) {
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if (rp->y < 0) {
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rp->height += rp->y;
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rp->height += rp->y;
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rp->y = 0;
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rp->y = 0;
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}
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}
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if ((rp->x >= psd->xvirtres) || (rp->width <= 0) ||
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if ((rp->x >= psd->xvirtres) || (rp->width <= 0) ||
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(rp->y >= psd->yvirtres) || (rp->height <= 0))
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(rp->y >= psd->yvirtres) || (rp->height <= 0))
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continue;
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continue;
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if (rp->x + rp->width > psd->xvirtres)
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if (rp->x + rp->width > psd->xvirtres)
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rp->width = psd->xvirtres - rp->x;
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rp->width = psd->xvirtres - rp->x;
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if (rp->y + rp->height > psd->yvirtres)
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if (rp->y + rp->height > psd->yvirtres)
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rp->height = psd->yvirtres - rp->y;
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rp->height = psd->yvirtres - rp->y;
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rc.left = rp->x;
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rc.left = rp->x;
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rc.top = rp->y;
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rc.top = rp->y;
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rc.right = rp->x+rp->width;
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rc.right = rp->x+rp->width;
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rc.bottom = rp->y+rp->height;
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rc.bottom = rp->y+rp->height;
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GdUnionRectWithRegion(&rc, clipregion);
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GdUnionRectWithRegion(&rc, clipregion);
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}
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}
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#endif
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#endif
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/* If there were no surviving clip rectangles, then set the clip
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/* If there were no surviving clip rectangles, then set the clip
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* cache to prevent all drawing.
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* cache to prevent all drawing.
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*/
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*/
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if (clipregion->numRects == 0) {
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if (clipregion->numRects == 0) {
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clipminx = MIN_MWCOORD;
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clipminx = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipresult = FALSE;
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clipresult = FALSE;
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return;
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return;
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}
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}
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/* There was at least one valid clip rectangle. Default the clip
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/* There was at least one valid clip rectangle. Default the clip
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* cache to be the first clip rectangle.
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* cache to be the first clip rectangle.
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*/
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*/
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clipminx = clipregion->rects[0].left;
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clipminx = clipregion->rects[0].left;
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clipminy = clipregion->rects[0].top;
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clipminy = clipregion->rects[0].top;
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clipmaxx = clipregion->rects[0].right - 1;
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clipmaxx = clipregion->rects[0].right - 1;
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clipmaxy = clipregion->rects[0].bottom - 1;
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clipmaxy = clipregion->rects[0].bottom - 1;
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clipresult = TRUE;
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clipresult = TRUE;
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}
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}
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/* Check a point against the list of clip rectangles.
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/* Check a point against the list of clip rectangles.
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* Returns TRUE if the point is within one or more rectangles and thus
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* Returns TRUE if the point is within one or more rectangles and thus
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* can be plotted, or FALSE if the point is not within any rectangle and
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* can be plotted, or FALSE if the point is not within any rectangle and
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* thus cannot be plotted. Also remembers the coordinates of a clip cache
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* thus cannot be plotted. Also remembers the coordinates of a clip cache
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* rectangle containing the specified point such that every point in the
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* rectangle containing the specified point such that every point in the
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* rectangle would give the same result. By examining this clip cache
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* rectangle would give the same result. By examining this clip cache
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* rectangle after a call to this routine, the caller can efficiently
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* rectangle after a call to this routine, the caller can efficiently
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* check many nearby points without needing any further calls. If the
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* check many nearby points without needing any further calls. If the
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* point lies within the cursor, then the cursor is removed.
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* point lies within the cursor, then the cursor is removed.
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*/
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*/
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MWBOOL
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MWBOOL
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GdClipPoint(PSD psd,MWCOORD x,MWCOORD y)
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GdClipPoint(PSD psd,MWCOORD x,MWCOORD y)
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{
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{
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int count;
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int count;
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MWRECT *rp;
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MWRECT *rp;
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MWCOORD temp;
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MWCOORD temp;
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/* First see whether the point lies within the current clip cache
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/* First see whether the point lies within the current clip cache
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* rectangle. If so, then we already know the result.
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* rectangle. If so, then we already know the result.
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*/
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*/
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if ((x >= clipminx) && (x <= clipmaxx) &&
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if ((x >= clipminx) && (x <= clipmaxx) &&
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(y >= clipminy) && (y <= clipmaxy)) {
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(y >= clipminy) && (y <= clipmaxy)) {
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if (clipresult) GdCheckCursor(psd, x, y, x, y);
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if (clipresult) GdCheckCursor(psd, x, y, x, y);
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return clipresult;
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return clipresult;
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}
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}
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/* If the point is outside of the screen area, then it is not
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/* If the point is outside of the screen area, then it is not
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* plottable, and the clip cache rectangle is the whole half-plane
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* plottable, and the clip cache rectangle is the whole half-plane
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* outside of the screen area.
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* outside of the screen area.
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*/
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*/
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if (x < 0) {
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if (x < 0) {
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clipminx = MIN_MWCOORD;
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clipminx = MIN_MWCOORD;
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clipmaxx = -1;
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clipmaxx = -1;
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clipminy = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipresult = FALSE;
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clipresult = FALSE;
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return FALSE;
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return FALSE;
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}
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}
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if (y < 0) {
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if (y < 0) {
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clipminx = MIN_MWCOORD;
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clipminx = MIN_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipmaxy = -1;
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clipmaxy = -1;
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clipresult = FALSE;
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clipresult = FALSE;
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return FALSE;
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return FALSE;
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}
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}
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if (x >= psd->xvirtres) {
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if (x >= psd->xvirtres) {
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clipminx = psd->xvirtres;
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clipminx = psd->xvirtres;
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clipmaxx = MAX_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipresult = FALSE;
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clipresult = FALSE;
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return FALSE;
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return FALSE;
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}
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}
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if (y >= psd->yvirtres) {
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if (y >= psd->yvirtres) {
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clipminx = MIN_MWCOORD;
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clipminx = MIN_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipminy = psd->yvirtres;
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clipminy = psd->yvirtres;
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clipmaxy = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipresult = FALSE;
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clipresult = FALSE;
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return FALSE;
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return FALSE;
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}
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}
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/* The point is within the screen area. If there are no clip
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/* The point is within the screen area. If there are no clip
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* rectangles, then the point is plottable and the rectangle is the
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* rectangles, then the point is plottable and the rectangle is the
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* whole screen.
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* whole screen.
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*/
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*/
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count = clipregion->numRects;
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count = clipregion->numRects;
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if (count <= 0) {
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if (count <= 0) {
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clipminx = 0;
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clipminx = 0;
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clipmaxx = psd->xvirtres - 1;
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clipmaxx = psd->xvirtres - 1;
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clipminy = 0;
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clipminy = 0;
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clipmaxy = psd->yvirtres - 1;
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clipmaxy = psd->yvirtres - 1;
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clipresult = TRUE;
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clipresult = TRUE;
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GdCheckCursor(psd, x, y, x, y);
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GdCheckCursor(psd, x, y, x, y);
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return TRUE;
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return TRUE;
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}
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}
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/* We need to scan the list of clip rectangles to calculate a new
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/* We need to scan the list of clip rectangles to calculate a new
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* clip cache rectangle containing this point, and the result. First
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* clip cache rectangle containing this point, and the result. First
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* see if the point lies within any of the clip rectangles. If so,
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* see if the point lies within any of the clip rectangles. If so,
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* then it is plottable and use that clip rectangle as the cache
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* then it is plottable and use that clip rectangle as the cache
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* rectangle. This is not necessarily the best result, but works ok
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* rectangle. This is not necessarily the best result, but works ok
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* and is fast.
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* and is fast.
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*/
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*/
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for (rp = clipregion->rects; count-- > 0; rp++) {
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for (rp = clipregion->rects; count-- > 0; rp++) {
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if ((x >= rp->left) && (y >= rp->top) && (x < rp->right)
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if ((x >= rp->left) && (y >= rp->top) && (x < rp->right)
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&& (y < rp->bottom)) {
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&& (y < rp->bottom)) {
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clipminx = rp->left;
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clipminx = rp->left;
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clipminy = rp->top;
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clipminy = rp->top;
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clipmaxx = rp->right - 1;
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clipmaxx = rp->right - 1;
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clipmaxy = rp->bottom - 1;
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clipmaxy = rp->bottom - 1;
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clipresult = TRUE;
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clipresult = TRUE;
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GdCheckCursor(psd, x, y, x, y);
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GdCheckCursor(psd, x, y, x, y);
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return TRUE;
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return TRUE;
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}
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}
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}
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}
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/* The point is not plottable. Scan the clip rectangles again to
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/* The point is not plottable. Scan the clip rectangles again to
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* determine a rectangle containing more non-plottable points.
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* determine a rectangle containing more non-plottable points.
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* Simply pick the largest rectangle whose area doesn't contain any
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* Simply pick the largest rectangle whose area doesn't contain any
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* of the same coordinates as appropriate sides of the clip
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* of the same coordinates as appropriate sides of the clip
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* rectangles. This is not necessarily the best result, but works ok
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* rectangles. This is not necessarily the best result, but works ok
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* and is fast.
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* and is fast.
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*/
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*/
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clipminx = MIN_MWCOORD;
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clipminx = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipminy = MIN_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxx = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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clipmaxy = MAX_MWCOORD;
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count = clipregion->numRects;
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count = clipregion->numRects;
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for (rp = clipregion->rects; count-- > 0; rp++) {
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for (rp = clipregion->rects; count-- > 0; rp++) {
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if ((x < rp->left) && (rp->left <= clipmaxx)) clipmaxx = rp->left - 1;
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if ((x < rp->left) && (rp->left <= clipmaxx)) clipmaxx = rp->left - 1;
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temp = rp->right - 1;
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temp = rp->right - 1;
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if ((x > temp) && (temp >= clipminx)) clipminx = temp + 1;
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if ((x > temp) && (temp >= clipminx)) clipminx = temp + 1;
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if ((y < rp->top) && (rp->top <= clipmaxy)) clipmaxy = rp->top - 1;
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if ((y < rp->top) && (rp->top <= clipmaxy)) clipmaxy = rp->top - 1;
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temp = rp->bottom - 1;
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temp = rp->bottom - 1;
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if ((y > temp) && (temp >= clipminy)) clipminy = temp + 1;
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if ((y > temp) && (temp >= clipminy)) clipminy = temp + 1;
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}
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}
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clipresult = FALSE;
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clipresult = FALSE;
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return FALSE;
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return FALSE;
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}
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}
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/* Check the area determined by the specified pair of points against the
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/* Check the area determined by the specified pair of points against the
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* list of clip rectangles. The area will either be totally visible,
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* list of clip rectangles. The area will either be totally visible,
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* totally visible, or possibly partially visible. This routine updates
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* totally visible, or possibly partially visible. This routine updates
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* the clip cache rectangle, and returns one of the following values:
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* the clip cache rectangle, and returns one of the following values:
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* CLIP_VISIBLE The whole rectangle is visible
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* CLIP_VISIBLE The whole rectangle is visible
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* CLIP_INVISIBLE The whole rectangle is invisible
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* CLIP_INVISIBLE The whole rectangle is invisible
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* CLIP_PARTIAL The rectangle may be partially visible
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* CLIP_PARTIAL The rectangle may be partially visible
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* In the case that the area is totally visible, the cursor is removed
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* In the case that the area is totally visible, the cursor is removed
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* if it overlaps the clip area.
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* if it overlaps the clip area.
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*/
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*/
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int
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int
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GdClipArea(PSD psd,MWCOORD x1, MWCOORD y1, MWCOORD x2, MWCOORD y2)
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GdClipArea(PSD psd,MWCOORD x1, MWCOORD y1, MWCOORD x2, MWCOORD y2)
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{
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{
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if ((x1 < clipminx) || (x1 > clipmaxx) ||
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if ((x1 < clipminx) || (x1 > clipmaxx) ||
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(y1 < clipminy) || (y1 > clipmaxy))
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(y1 < clipminy) || (y1 > clipmaxy))
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GdClipPoint(psd, x1, y1);
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GdClipPoint(psd, x1, y1);
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if ((x2 >= clipminx) && (x2 <= clipmaxx) &&
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if ((x2 >= clipminx) && (x2 <= clipmaxx) &&
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(y2 >= clipminy) && (y2 <= clipmaxy)) {
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(y2 >= clipminy) && (y2 <= clipmaxy)) {
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if (!clipresult) return CLIP_INVISIBLE;
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if (!clipresult) return CLIP_INVISIBLE;
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GdCheckCursor(psd, x1, y1, x2, y2);
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GdCheckCursor(psd, x1, y1, x2, y2);
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return CLIP_VISIBLE;
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return CLIP_VISIBLE;
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}
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}
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return CLIP_PARTIAL;
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return CLIP_PARTIAL;
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}
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}
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