1 /*
2 
3 Copyright 1993, 1998  The Open Group
4 
5 Permission to use, copy, modify, distribute, and sell this software and its
6 documentation for any purpose is hereby granted without fee, provided that
7 the above copyright notice appear in all copies and that both that
8 copyright notice and this permission notice appear in supporting
9 documentation.
10 
11 The above copyright notice and this permission notice shall be included
12 in all copies or substantial portions of the Software.
13 
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 OTHER DEALINGS IN THE SOFTWARE.
21 
22 Except as contained in this notice, the name of The Open Group shall
23 not be used in advertising or otherwise to promote the sale, use or
24 other dealings in this Software without prior written authorization
25 from The Open Group.
26 
27 */
28 
29 #ifdef HAVE_DIX_CONFIG_H
30 #include <dix-config.h>
31 #endif
32 
33 #include "scrnintstr.h"
34 #include "gcstruct.h"
35 #include "pixmapstr.h"
36 #include "windowstr.h"
37 #include "migc.h"
38 
39 /* ARGSUSED */
40 void
miChangeGC(GCPtr pGC,unsigned long mask)41 miChangeGC(GCPtr pGC, unsigned long mask)
42 {
43     return;
44 }
45 
46 void
miDestroyGC(GCPtr pGC)47 miDestroyGC(GCPtr pGC)
48 {
49     if (pGC->freeCompClip)
50         RegionDestroy(pGC->pCompositeClip);
51 }
52 
53 void
miDestroyClip(GCPtr pGC)54 miDestroyClip(GCPtr pGC)
55 {
56     if (pGC->clientClip)
57         RegionDestroy(pGC->clientClip);
58     pGC->clientClip = NULL;
59 }
60 
61 void
miChangeClip(GCPtr pGC,int type,void * pvalue,int nrects)62 miChangeClip(GCPtr pGC, int type, void *pvalue, int nrects)
63 {
64     (*pGC->funcs->DestroyClip) (pGC);
65     if (type == CT_PIXMAP) {
66         /* convert the pixmap to a region */
67         pGC->clientClip = BitmapToRegion(pGC->pScreen, (PixmapPtr) pvalue);
68         (*pGC->pScreen->DestroyPixmap) (pvalue);
69     }
70     else if (type == CT_REGION) {
71         /* stuff the region in the GC */
72         pGC->clientClip = pvalue;
73     }
74     else if (type != CT_NONE) {
75         pGC->clientClip = RegionFromRects(nrects, (xRectangle *) pvalue, type);
76         free(pvalue);
77     }
78     pGC->stateChanges |= GCClipMask;
79 }
80 
81 void
miCopyClip(GCPtr pgcDst,GCPtr pgcSrc)82 miCopyClip(GCPtr pgcDst, GCPtr pgcSrc)
83 {
84     if (pgcSrc->clientClip) {
85         RegionPtr prgnNew = RegionCreate(NULL, 1);
86         RegionCopy(prgnNew, (RegionPtr) (pgcSrc->clientClip));
87         (*pgcDst->funcs->ChangeClip) (pgcDst, CT_REGION, prgnNew, 0);
88     } else {
89         (*pgcDst->funcs->ChangeClip) (pgcDst, CT_NONE, NULL, 0);
90     }
91 }
92 
93 /* ARGSUSED */
94 void
miCopyGC(GCPtr pGCSrc,unsigned long changes,GCPtr pGCDst)95 miCopyGC(GCPtr pGCSrc, unsigned long changes, GCPtr pGCDst)
96 {
97     return;
98 }
99 
100 void
miComputeCompositeClip(GCPtr pGC,DrawablePtr pDrawable)101 miComputeCompositeClip(GCPtr pGC, DrawablePtr pDrawable)
102 {
103     if (pDrawable->type == DRAWABLE_WINDOW) {
104         WindowPtr pWin = (WindowPtr) pDrawable;
105         RegionPtr pregWin;
106         Bool freeTmpClip, freeCompClip;
107 
108         if (pGC->subWindowMode == IncludeInferiors) {
109             pregWin = NotClippedByChildren(pWin);
110             freeTmpClip = TRUE;
111         }
112         else {
113             pregWin = &pWin->clipList;
114             freeTmpClip = FALSE;
115         }
116         freeCompClip = pGC->freeCompClip;
117 
118         /*
119          * if there is no client clip, we can get by with just keeping the
120          * pointer we got, and remembering whether or not should destroy (or
121          * maybe re-use) it later.  this way, we avoid unnecessary copying of
122          * regions.  (this wins especially if many clients clip by children
123          * and have no client clip.)
124          */
125         if (!pGC->clientClip) {
126             if (freeCompClip)
127                 RegionDestroy(pGC->pCompositeClip);
128             pGC->pCompositeClip = pregWin;
129             pGC->freeCompClip = freeTmpClip;
130         }
131         else {
132             /*
133              * we need one 'real' region to put into the composite clip. if
134              * pregWin the current composite clip are real, we can get rid of
135              * one. if pregWin is real and the current composite clip isn't,
136              * use pregWin for the composite clip. if the current composite
137              * clip is real and pregWin isn't, use the current composite
138              * clip. if neither is real, create a new region.
139              */
140 
141             RegionTranslate(pGC->clientClip,
142                             pDrawable->x + pGC->clipOrg.x,
143                             pDrawable->y + pGC->clipOrg.y);
144 
145             if (freeCompClip) {
146                 RegionIntersect(pGC->pCompositeClip, pregWin, pGC->clientClip);
147                 if (freeTmpClip)
148                     RegionDestroy(pregWin);
149             }
150             else if (freeTmpClip) {
151                 RegionIntersect(pregWin, pregWin, pGC->clientClip);
152                 pGC->pCompositeClip = pregWin;
153             }
154             else {
155                 pGC->pCompositeClip = RegionCreate(NullBox, 0);
156                 RegionIntersect(pGC->pCompositeClip, pregWin, pGC->clientClip);
157             }
158             pGC->freeCompClip = TRUE;
159             RegionTranslate(pGC->clientClip,
160                             -(pDrawable->x + pGC->clipOrg.x),
161                             -(pDrawable->y + pGC->clipOrg.y));
162         }
163     }                           /* end of composite clip for a window */
164     else {
165         BoxRec pixbounds;
166 
167         /* XXX should we translate by drawable.x/y here ? */
168         /* If you want pixmaps in offscreen memory, yes */
169         pixbounds.x1 = pDrawable->x;
170         pixbounds.y1 = pDrawable->y;
171         pixbounds.x2 = pDrawable->x + pDrawable->width;
172         pixbounds.y2 = pDrawable->y + pDrawable->height;
173 
174         if (pGC->freeCompClip) {
175             RegionReset(pGC->pCompositeClip, &pixbounds);
176         }
177         else {
178             pGC->freeCompClip = TRUE;
179             pGC->pCompositeClip = RegionCreate(&pixbounds, 1);
180         }
181 
182         if (pGC->clientClip) {
183             if (pDrawable->x || pDrawable->y) {
184                 RegionTranslate(pGC->clientClip,
185                                 pDrawable->x + pGC->clipOrg.x,
186                                 pDrawable->y + pGC->clipOrg.y);
187                 RegionIntersect(pGC->pCompositeClip,
188                                 pGC->pCompositeClip, pGC->clientClip);
189                 RegionTranslate(pGC->clientClip,
190                                 -(pDrawable->x + pGC->clipOrg.x),
191                                 -(pDrawable->y + pGC->clipOrg.y));
192             }
193             else {
194                 RegionTranslate(pGC->pCompositeClip,
195                                 -pGC->clipOrg.x, -pGC->clipOrg.y);
196                 RegionIntersect(pGC->pCompositeClip,
197                                 pGC->pCompositeClip, pGC->clientClip);
198                 RegionTranslate(pGC->pCompositeClip,
199                                 pGC->clipOrg.x, pGC->clipOrg.y);
200             }
201         }
202     }                           /* end of composite clip for pixmap */
203 }                               /* end miComputeCompositeClip */
204