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401 lines
11 KiB
C
401 lines
11 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* gnomergn.c --- gnome functions dealing with front-end */
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#include "fe_rgn.h"
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#include "xpassert.h"
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#include "gnome.h"
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#include <gdk/gdkprivate.h>
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#include <gdk/gdktypes.h>
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#include <X11/X.h>
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#include "gnomefe.h"
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/* oh, how we love hacking around in x internals */
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#include "x_region.h"
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/* typedef to make working with GdkRegion** a bit easier */
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typedef GdkRegion **GdkRegionHandle;
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/* Creates an empty region. Returns NULL if region can't be created */
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FE_Region
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FE_CreateRegion()
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{
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GdkRegionHandle hdl;
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GdkRegion *new_region = gdk_region_new();
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if (new_region == NULL)
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return NULL;
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hdl = (GdkRegionHandle)(malloc(sizeof(GdkRegionHandle)));
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(GdkRegion*)(*hdl) = new_region;
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/* printf("empty Region created at %p\n", hdl); */
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return (FE_Region)hdl;
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}
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/* Creates a region from a rectangle. Returns NULL if region can't be created */
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FE_Region
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FE_CreateRectRegion(XP_Rect *rect)
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{
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GdkPoint points[4];
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GdkRegion *new_region;
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GdkRegionHandle hdl;
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points[0].x = points[3].x = (short)rect->left; /* points[] corresponds to */
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points[0].y = points[1].y = (short)rect->top; /* top-left, top-right, */
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points[1].x = points[2].x = (short)rect->right; /* bot-left and bot-right */
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points[3].y = points[2].y = (short)rect->bottom;/* respectively. */
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new_region = gdk_region_polygon(points, 4, GDK_EVEN_ODD_RULE);
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if (new_region == NULL)
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return NULL;
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hdl = (GdkRegionHandle)(malloc(sizeof(GdkRegionHandle)));
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*hdl=new_region;
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/* printf("Region created from rectangle at %p\n", hdl); */
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/* printf("dimension are %d %d %d %d\n", rect->left, rect->top,
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rect->right, rect->bottom); */
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return (FE_Region)hdl;
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/* Fill rule is irrelevant since there */
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/* should be no self overlap. */
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}
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/* Set an existing region to a rectangle. */
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/* The purpose of this routine is to avoid the overhead of destroying and */
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/* recreating a region on the Windows platform. Unfortunately, it doesn't */
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/* do much for X. */
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FE_Region
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FE_SetRectRegion(FE_Region region, XP_Rect *rect)
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{
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GdkRectangle rectangle;
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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GdkRegionHandle hdl;
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XP_ASSERT(reg);
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if ( !gdk_region_empty(reg) )
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reg = gdk_regions_subtract(reg, reg);
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XP_ASSERT(gdk_empty_region(reg));
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rectangle.x = (short)rect->left;
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rectangle.y = (short)rect->top;
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rectangle.width = (unsigned short)(rect->right - rect->left);
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rectangle.height = (unsigned short)(rect->bottom - rect->top);
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reg = gdk_region_union_with_rect(reg, &rectangle);
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hdl = (GdkRegionHandle)(malloc(sizeof(GdkRegionHandle)));
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XP_ASSERT(hdl);
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*hdl = reg;
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/* printf("setrectregion done for %p\n", hdl); */
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return (FE_Region)hdl;
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}
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/* Destroys region */
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void
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FE_DestroyRegion(FE_Region region)
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{
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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XP_ASSERT(reg);
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gdk_region_destroy(reg);
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free(region);
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/* printf("region freed at %p\n", region); */
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}
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/* Make a copy of a region */
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FE_Region
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FE_CopyRegion(FE_Region src, FE_Region dst)
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{
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GdkRegion *srcRegion = (GdkRegion*)(*(GdkRegionHandle)src);
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GdkRegion *dstRegion = (GdkRegion*)(*(GdkRegionHandle)dst);
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GdkRegionHandle hdl;
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GdkRegionHandle cpy;
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XP_ASSERT(src);
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XP_ASSERT(srcRegion);
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if (dst != NULL)
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{
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cpy = dst;
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}
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else
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{
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/* Create an empty region and assign it to the cpy handle*/
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GdkRegion *copyRegion = gdk_region_new();
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cpy = (GdkRegionHandle)malloc( sizeof(GdkRegionHandle ));
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if (copyRegion == NULL || cpy == NULL)
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return NULL;
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*cpy = copyRegion;
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}
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/* Copy the region */
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(GdkRegion*)(*cpy) = gdk_regions_union(srcRegion, srcRegion);
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/* wierd: union between two same regions? */
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/* XUnionRegion((Region)src, (Region)src, (Region)copyRegion); */
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/* printf("FE_CopyRegion called and done\n"); */
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return cpy;
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}
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/* dst = src1 intersect sr2 */
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/* dst can be one of src1 or src2 */
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void
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FE_IntersectRegion(FE_Region src1, FE_Region src2, FE_Region dst)
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{
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GdkRegion *src1Region = (GdkRegion*)(*(GdkRegionHandle)src1);
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GdkRegion *src2Region = (GdkRegion*)(*(GdkRegionHandle)src2);
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GdkRegion *dstRegion = (GdkRegion*)(*(GdkRegionHandle)dst);
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GdkRegion *newRegion;
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XP_ASSERT(src1Region);
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XP_ASSERT(src2Region);
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XP_ASSERT(dstRegion);
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newRegion = gdk_regions_intersect(src1Region, src2Region);
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if (dstRegion == src1Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src1 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else if (dstRegion == src2Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src2 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)dst = newRegion;
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}
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/* printf("done region intersect\n"); */
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/* XIntersectRegion((Region)src1, (Region)src2, (Region)dst); */
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}
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/* dst = src1 union src2 */
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/* dst can be one of src1 or src2 */
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void
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FE_UnionRegion(FE_Region src1, FE_Region src2, FE_Region dst)
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{
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GdkRegion *src1Region = (GdkRegion*)(*(GdkRegionHandle)src1);
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GdkRegion *src2Region = (GdkRegion*)(*(GdkRegionHandle)src2);
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GdkRegion *dstRegion = (GdkRegion*)(*(GdkRegionHandle)dst);
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GdkRegion *newRegion;
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XP_ASSERT(src1Region);
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XP_ASSERT(src2Region);
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XP_ASSERT(dstRegion);
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newRegion = gdk_regions_union(src1Region, src2Region);
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/* XUnionRegion((Region)src1, (Region)src2, (Region)dst); */
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if (dstRegion == src1Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src1 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else if (dstRegion == src2Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src2 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)dst = newRegion;
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}
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/* printf("done union regions\n"); */
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}
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/* dst = src1 - src2 */
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/* dst can be one of src1 or src2 */
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void
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FE_SubtractRegion(FE_Region src1, FE_Region src2, FE_Region dst)
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{
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GdkRegion *src1Region = (GdkRegion*)(*(GdkRegionHandle)src1);
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GdkRegion *src2Region = (GdkRegion*)(*(GdkRegionHandle)src2);
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GdkRegion *dstRegion = (GdkRegion*)(*(GdkRegionHandle)dst);
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GdkRegion *newRegion;
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XP_ASSERT(src1Region);
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XP_ASSERT(src2Region);
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XP_ASSERT(dstRegion);
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newRegion = gdk_regions_subtract(src1Region, src2Region);
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/* XSubtractRegion((Region)src1, (Region)src2, (Region)dst); */
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if (dstRegion == src1Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src1 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else if (dstRegion == src2Region)
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)src2 =
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(GdkRegion*)*(GdkRegionHandle)dst =
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newRegion;
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}
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else
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{
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gdk_region_destroy(dstRegion);
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(GdkRegion*)*(GdkRegionHandle)dst = newRegion;
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}
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/* printf("done subtract region\n"); */
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}
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/* Returns TRUE if the region contains no pixels */
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XP_Bool
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FE_IsEmptyRegion(FE_Region region)
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{
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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XP_ASSERT(reg);
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return (XP_Bool)gdk_region_empty(reg);
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}
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/* Returns the bounding rectangle of the region */
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void
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FE_GetRegionBoundingBox(FE_Region region, XP_Rect *bbox)
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{
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GdkRectangle rect;
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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XP_ASSERT(reg);
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XP_ASSERT(bbox);
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gdk_region_get_clipbox(reg, &rect);
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bbox->left = (int32)rect.x;
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bbox->top = (int32)rect.y;
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bbox->right = (int32)(rect.x + rect.width);
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bbox->bottom = (int32)(rect.y + rect.height);
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/* printf("done boundingbox at %p\n", region); */
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}
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/* TRUE if rgn1 == rgn2 */
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XP_Bool
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FE_IsEqualRegion(FE_Region rgn1, FE_Region rgn2)
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{
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GdkRegion *reg1 = (GdkRegion*)(*(GdkRegionHandle)rgn1);
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GdkRegion *reg2 = (GdkRegion*)(*(GdkRegionHandle)rgn2);
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XP_ASSERT(reg1);
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XP_ASSERT(reg2);
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/* printf ("done isequal\n"); */
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return (XP_Bool)gdk_region_equal(reg1,reg2);
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}
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/* Moves a region by the specified offsets */
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void
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FE_OffsetRegion(FE_Region region, int32 x_offset, int32 y_offset)
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{
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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gdk_region_offset(reg, x_offset, y_offset);
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}
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/* Returns TRUE if any part of the rectangle is in the specified region */
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XP_Bool
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FE_RectInRegion(FE_Region region, XP_Rect *rect)
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{
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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GdkOverlapType result;
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GdkRectangle box;
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XP_ASSERT(reg);
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XP_ASSERT(rect);
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box.x = (short)rect->left;
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box.y = (short)rect->top;
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box.width = (unsigned short)(rect->right - rect->left);
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box.height = (unsigned short)(rect->bottom - rect->top);
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result = gdk_region_rect_in(reg, &box);
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/* printf ("done rectinregion\n"); */
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if (result == GDK_OVERLAP_RECTANGLE_OUT)
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return FALSE;
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else /* result == RectangleIn || result == RectanglePart */
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return TRUE;
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}
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/* Calls the specified function for each rectangle that makes up the region */
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void
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FE_ForEachRectInRegion(FE_Region region, FE_RectInRegionFunc func,
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void *closure)
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{
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GdkRegion *reg = (GdkRegion*)(*(GdkRegionHandle)region);
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Region pRegion;
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register int nbox;
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register BOX *pbox;
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XP_Rect rect;
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XP_ASSERT(reg);
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XP_ASSERT(func);
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pRegion = (Region)((GdkRegionPrivate *)reg)->xregion;
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pbox = pRegion->rects;
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nbox = pRegion->numRects;
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while(nbox--)
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{
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rect.left = pbox->x1;
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rect.right = pbox->x2;
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rect.top = pbox->y1;
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rect.bottom = pbox->y2;
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(*func)(closure, &rect);
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pbox++;
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}
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/* printf("done foreachrectinregion\n"); */
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}
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#ifdef DEBUG
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void
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FE_HighlightRect(void *c, XP_Rect *rect, int how_much)
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{
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printf("FE_HighlightRect (empty)\n");
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}
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void
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FE_HighlightRegion(void *c, FE_Region region, int how_much)
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{
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printf("FE_HighlightRegion (empty)\n");
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}
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#endif /* DEBUG */
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