migc.c (6942B)
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 41 miChangeGC(GCPtr pGC, unsigned long mask) 42 { 43 return; 44 } 45 46 void 47 miDestroyGC(GCPtr pGC) 48 { 49 if (pGC->freeCompClip) 50 RegionDestroy(pGC->pCompositeClip); 51 } 52 53 void 54 miDestroyClip(GCPtr pGC) 55 { 56 if (pGC->clientClip) 57 RegionDestroy(pGC->clientClip); 58 pGC->clientClip = NULL; 59 } 60 61 void 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 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 95 miCopyGC(GCPtr pGCSrc, unsigned long changes, GCPtr pGCDst) 96 { 97 return; 98 } 99 100 void 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 */