forked from AuroraMiddleware/gtk
351 lines
8.1 KiB
C
351 lines
8.1 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gdk.h"
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#include "gdkprivate.h"
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GdkRegion*
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gdk_region_new (void)
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{
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GdkRegionPrivate *private;
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GdkRegion *region;
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HRGN xregion;
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/* Create an empty region */
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xregion = CreateRectRgn (1, 1, 0, 0);
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private = g_new (GdkRegionPrivate, 1);
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private->xregion = xregion;
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region = (GdkRegion*) private;
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region->user_data = NULL;
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return region;
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}
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void
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gdk_region_destroy (GdkRegion *region)
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{
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GdkRegionPrivate *private;
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g_return_if_fail (region != NULL);
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private = (GdkRegionPrivate *) region;
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DeleteObject (private->xregion);
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g_free (private);
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}
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gboolean
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gdk_region_empty (GdkRegion *region)
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{
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GdkRegionPrivate *private;
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RECT rect;
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g_return_val_if_fail (region != NULL, 0);
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private = (GdkRegionPrivate *) region;
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return (GetRgnBox (private->xregion, &rect) == NULLREGION);
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}
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gboolean
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gdk_region_equal (GdkRegion *region1,
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GdkRegion *region2)
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{
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GdkRegionPrivate *private1;
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GdkRegionPrivate *private2;
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g_return_val_if_fail (region1 != NULL, 0);
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g_return_val_if_fail (region2 != NULL, 0);
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private1 = (GdkRegionPrivate *) region1;
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private2 = (GdkRegionPrivate *) region2;
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return EqualRgn (private1->xregion, private2->xregion);
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}
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void
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gdk_region_get_clipbox(GdkRegion *region,
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GdkRectangle *rectangle)
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{
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GdkRegionPrivate *rp;
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RECT r;
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g_return_if_fail(region != NULL);
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g_return_if_fail(rectangle != NULL);
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rp = (GdkRegionPrivate *)region;
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GetRgnBox (rp->xregion, &r);
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rectangle->x = r.left;
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rectangle->y = r.top;
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rectangle->width = r.right - r.left;
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rectangle->height = r.bottom - r.top;
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}
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gboolean
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gdk_region_point_in (GdkRegion *region,
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gint x,
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gint y)
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{
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GdkRegionPrivate *private;
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g_return_val_if_fail (region != NULL, 0);
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private = (GdkRegionPrivate *) region;
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return PtInRegion (private->xregion, x, y);
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}
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GdkOverlapType
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gdk_region_rect_in (GdkRegion *region,
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GdkRectangle *rect)
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{
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GdkRegionPrivate *private;
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RECT r;
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int res;
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g_return_val_if_fail (region != NULL, 0);
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private = (GdkRegionPrivate *) region;
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r.left = rect->x;
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r.top = rect->y;
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r.right = rect->x + rect->width;
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r.bottom = rect->y + rect->height;
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if (RectInRegion (private->xregion, &r))
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return GDK_OVERLAP_RECTANGLE_PART;
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return GDK_OVERLAP_RECTANGLE_OUT; /*what else ? */
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}
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GdkRegion *
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gdk_region_polygon (GdkPoint *points,
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gint npoints,
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GdkFillRule fill_rule)
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{
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GdkRegionPrivate *private;
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GdkRegion *region;
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HRGN xregion;
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POINT *pts;
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gint xfill_rule = ALTERNATE;
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gint i;
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g_return_val_if_fail (points != NULL, NULL);
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g_return_val_if_fail (npoints != 0, NULL); /* maybe we should check for at least three points */
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switch (fill_rule)
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{
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case GDK_EVEN_ODD_RULE:
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xfill_rule = ALTERNATE;
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break;
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case GDK_WINDING_RULE:
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xfill_rule = WINDING;
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break;
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}
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pts = g_malloc (npoints * sizeof (*pts));
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for (i = 0; i < npoints; i++)
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{
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pts[i].x = points[i].x;
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pts[i].y = points[i].y;
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}
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xregion = CreatePolygonRgn (pts, npoints, xfill_rule);
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g_free (pts);
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private = g_new (GdkRegionPrivate, 1);
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private->xregion = xregion;
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region = (GdkRegion *) private;
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region->user_data = NULL;
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return region;
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}
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void
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gdk_region_offset (GdkRegion *region,
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gint dx,
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gint dy)
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{
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GdkRegionPrivate *private;
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g_return_if_fail (region != NULL);
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private = (GdkRegionPrivate *) region;
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OffsetRgn (private->xregion, dx, dy);
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}
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void
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gdk_region_shrink (GdkRegion *region,
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gint dx,
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gint dy)
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{
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GdkRegionPrivate *private;
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RECT r;
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g_return_if_fail (region != NULL);
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private = (GdkRegionPrivate *) region;
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/* Is it correct just to intersect it with a smaller bounding box? */
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GetRgnBox (private->xregion, &r);
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if (-dx > r.right - r.left)
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{
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r.left += dx/2;
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r.right -= dx/2;
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}
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if (-dy > r.bottom - r.top)
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{
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r.top += dy/2;
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r.bottom -= dy/2;
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}
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CombineRgn (private->xregion, private->xregion,
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CreateRectRgnIndirect (&r), RGN_AND);
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}
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GdkRegion*
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gdk_region_union_with_rect (GdkRegion *region,
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GdkRectangle *rect)
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{
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GdkRegionPrivate *private;
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GdkRegion *res;
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GdkRegionPrivate *res_private;
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RECT xrect;
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g_return_val_if_fail (region != NULL, NULL);
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private = (GdkRegionPrivate *) region;
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xrect.left = rect->x;
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xrect.top = rect->y;
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xrect.right = rect->x + rect->width;
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xrect.bottom = rect->y + rect->height;
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res = gdk_region_new ();
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res_private = (GdkRegionPrivate *) res;
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CombineRgn (res_private->xregion, private->xregion,
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CreateRectRgnIndirect (&xrect), RGN_OR);
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return res;
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}
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GdkRegion*
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gdk_regions_intersect (GdkRegion *source1,
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GdkRegion *source2)
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{
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GdkRegionPrivate *private1;
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GdkRegionPrivate *private2;
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GdkRegion *res;
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GdkRegionPrivate *res_private;
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g_return_val_if_fail (source1 != NULL, NULL);
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g_return_val_if_fail (source2 != NULL, NULL);
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private1 = (GdkRegionPrivate *) source1;
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private2 = (GdkRegionPrivate *) source2;
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res = gdk_region_new ();
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res_private = (GdkRegionPrivate *) res;
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CombineRgn (res_private->xregion, private1->xregion, private2->xregion,
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RGN_AND);
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return res;
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}
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GdkRegion*
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gdk_regions_union (GdkRegion *source1,
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GdkRegion *source2)
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{
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GdkRegionPrivate *private1;
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GdkRegionPrivate *private2;
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GdkRegion *res;
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GdkRegionPrivate *res_private;
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g_return_val_if_fail (source1 != NULL, NULL);
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g_return_val_if_fail (source2 != NULL, NULL);
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private1 = (GdkRegionPrivate *) source1;
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private2 = (GdkRegionPrivate *) source2;
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res = gdk_region_new ();
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res_private = (GdkRegionPrivate *) res;
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CombineRgn (res_private->xregion, private1->xregion, private2->xregion,
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RGN_OR);
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return res;
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}
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GdkRegion*
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gdk_regions_subtract (GdkRegion *source1,
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GdkRegion *source2)
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{
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GdkRegionPrivate *private1;
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GdkRegionPrivate *private2;
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GdkRegion *res;
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GdkRegionPrivate *res_private;
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g_return_val_if_fail (source1 != NULL, NULL);
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g_return_val_if_fail (source2 != NULL, NULL);
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private1 = (GdkRegionPrivate *) source1;
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private2 = (GdkRegionPrivate *) source2;
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res = gdk_region_new ();
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res_private = (GdkRegionPrivate *) res;
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CombineRgn (res_private->xregion, private1->xregion, private2->xregion,
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RGN_DIFF);
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return res;
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}
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GdkRegion*
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gdk_regions_xor (GdkRegion *source1,
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GdkRegion *source2)
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{
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GdkRegionPrivate *private1;
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GdkRegionPrivate *private2;
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GdkRegion *res;
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GdkRegionPrivate *res_private;
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g_return_val_if_fail (source1 != NULL, NULL);
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g_return_val_if_fail (source2 != NULL, NULL);
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private1 = (GdkRegionPrivate *) source1;
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private2 = (GdkRegionPrivate *) source2;
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res = gdk_region_new ();
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res_private = (GdkRegionPrivate *) res;
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CombineRgn (res_private->xregion, private1->xregion, private2->xregion,
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RGN_XOR);
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return res;
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}
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