gecko-dev/cmd/gnomefe/gnome-rgn.c
1998-10-25 17:39:06 +00:00

401 lines
11 KiB
C

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