micopy.c revision 35c4bbdf 
1/*
2 * Copyright © 1998 Keith Packard
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation, and that the name of Keith Packard not be used in
9 * advertising or publicity pertaining to distribution of the software without
10 * specific, written prior permission.  Keith Packard makes no
11 * representations about the suitability of this software for any purpose.  It
12 * is provided "as is" without express or implied warranty.
13 *
14 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20 * PERFORMANCE OF THIS SOFTWARE.
21 */
22
23#ifdef HAVE_DIX_CONFIG_H
24#include <dix-config.h>
25#endif
26
27#include "mi.h"
28#include "scrnintstr.h"
29#include "gcstruct.h"
30#include "pixmap.h"
31#include "pixmapstr.h"
32#include "windowstr.h"
33
34void
35miCopyRegion(DrawablePtr pSrcDrawable,
36             DrawablePtr pDstDrawable,
37             GCPtr pGC,
38             RegionPtr pDstRegion,
39             int dx, int dy, miCopyProc copyProc, Pixel bitPlane, void *closure)
40{
41    int careful;
42    Bool reverse;
43    Bool upsidedown;
44    BoxPtr pbox;
45    int nbox;
46    BoxPtr pboxNew1, pboxNew2, pboxBase, pboxNext, pboxTmp;
47
48    pbox = RegionRects(pDstRegion);
49    nbox = RegionNumRects(pDstRegion);
50
51    /* XXX we have to err on the side of safety when both are windows,
52     * because we don't know if IncludeInferiors is being used.
53     */
54    careful = ((pSrcDrawable == pDstDrawable) ||
55               ((pSrcDrawable->type == DRAWABLE_WINDOW) &&
56                (pDstDrawable->type == DRAWABLE_WINDOW)));
57
58    pboxNew1 = NULL;
59    pboxNew2 = NULL;
60    if (careful && dy < 0) {
61        upsidedown = TRUE;
62
63        if (nbox > 1) {
64            /* keep ordering in each band, reverse order of bands */
65            pboxNew1 = xallocarray(nbox, sizeof(BoxRec));
66            if (!pboxNew1)
67                return;
68            pboxBase = pboxNext = pbox + nbox - 1;
69            while (pboxBase >= pbox) {
70                while ((pboxNext >= pbox) && (pboxBase->y1 == pboxNext->y1))
71                    pboxNext--;
72                pboxTmp = pboxNext + 1;
73                while (pboxTmp <= pboxBase) {
74                    *pboxNew1++ = *pboxTmp++;
75                }
76                pboxBase = pboxNext;
77            }
78            pboxNew1 -= nbox;
79            pbox = pboxNew1;
80        }
81    }
82    else {
83        /* walk source top to bottom */
84        upsidedown = FALSE;
85    }
86
87    if (careful && dx < 0) {
88        /* walk source right to left */
89        if (dy <= 0)
90            reverse = TRUE;
91        else
92            reverse = FALSE;
93
94        if (nbox > 1) {
95            /* reverse order of rects in each band */
96            pboxNew2 = xallocarray(nbox, sizeof(BoxRec));
97            if (!pboxNew2) {
98                free(pboxNew1);
99                return;
100            }
101            pboxBase = pboxNext = pbox;
102            while (pboxBase < pbox + nbox) {
103                while ((pboxNext < pbox + nbox) &&
104                       (pboxNext->y1 == pboxBase->y1))
105                    pboxNext++;
106                pboxTmp = pboxNext;
107                while (pboxTmp != pboxBase) {
108                    *pboxNew2++ = *--pboxTmp;
109                }
110                pboxBase = pboxNext;
111            }
112            pboxNew2 -= nbox;
113            pbox = pboxNew2;
114        }
115    }
116    else {
117        /* walk source left to right */
118        reverse = FALSE;
119    }
120
121    (*copyProc) (pSrcDrawable,
122                 pDstDrawable,
123                 pGC,
124                 pbox, nbox, dx, dy, reverse, upsidedown, bitPlane, closure);
125
126    free(pboxNew1);
127    free(pboxNew2);
128}
129
130RegionPtr
131miDoCopy(DrawablePtr pSrcDrawable,
132         DrawablePtr pDstDrawable,
133         GCPtr pGC,
134         int xIn,
135         int yIn,
136         int widthSrc,
137         int heightSrc,
138         int xOut, int yOut, miCopyProc copyProc, Pixel bitPlane, void *closure)
139{
140    RegionPtr prgnSrcClip = NULL;       /* may be a new region, or just a copy */
141    Bool freeSrcClip = FALSE;
142    RegionPtr prgnExposed = NULL;
143    RegionRec rgnDst;
144    int dx;
145    int dy;
146    int numRects;
147    int box_x1;
148    int box_y1;
149    int box_x2;
150    int box_y2;
151    Bool fastSrc = FALSE;       /* for fast clipping with pixmap source */
152    Bool fastDst = FALSE;       /* for fast clipping with one rect dest */
153    Bool fastExpose = FALSE;    /* for fast exposures with pixmap source */
154
155    /* Short cut for unmapped windows */
156
157    if (pDstDrawable->type == DRAWABLE_WINDOW &&
158        !((WindowPtr) pDstDrawable)->realized) {
159        return NULL;
160    }
161
162    if (pSrcDrawable->pScreen->SourceValidate) {
163        (*pSrcDrawable->pScreen->SourceValidate) (pSrcDrawable, xIn, yIn,
164                                                  widthSrc, heightSrc,
165                                                  pGC->subWindowMode);
166    }
167
168    /* Compute source clip region */
169    if (pSrcDrawable->type == DRAWABLE_PIXMAP) {
170        if ((pSrcDrawable == pDstDrawable) && (!pGC->clientClip))
171            prgnSrcClip = miGetCompositeClip(pGC);
172        else
173            fastSrc = TRUE;
174    }
175    else {
176        if (pGC->subWindowMode == IncludeInferiors) {
177            /*
178             * XFree86 DDX empties the border clip when the
179             * VT is inactive, make sure the region isn't empty
180             */
181            if (!((WindowPtr) pSrcDrawable)->parent &&
182                RegionNotEmpty(&((WindowPtr) pSrcDrawable)->borderClip)) {
183                /*
184                 * special case bitblt from root window in
185                 * IncludeInferiors mode; just like from a pixmap
186                 */
187                fastSrc = TRUE;
188            }
189            else if ((pSrcDrawable == pDstDrawable) && (!pGC->clientClip)) {
190                prgnSrcClip = miGetCompositeClip(pGC);
191            }
192            else {
193                prgnSrcClip = NotClippedByChildren((WindowPtr) pSrcDrawable);
194                freeSrcClip = TRUE;
195            }
196        }
197        else {
198            prgnSrcClip = &((WindowPtr) pSrcDrawable)->clipList;
199        }
200    }
201
202    xIn += pSrcDrawable->x;
203    yIn += pSrcDrawable->y;
204
205    xOut += pDstDrawable->x;
206    yOut += pDstDrawable->y;
207
208    box_x1 = xIn;
209    box_y1 = yIn;
210    box_x2 = xIn + widthSrc;
211    box_y2 = yIn + heightSrc;
212
213    dx = xIn - xOut;
214    dy = yIn - yOut;
215
216    /* Don't create a source region if we are doing a fast clip */
217    if (fastSrc) {
218        RegionPtr cclip;
219
220        fastExpose = TRUE;
221        /*
222         * clip the source; if regions extend beyond the source size,
223         * make sure exposure events get sent
224         */
225        if (box_x1 < pSrcDrawable->x) {
226            box_x1 = pSrcDrawable->x;
227            fastExpose = FALSE;
228        }
229        if (box_y1 < pSrcDrawable->y) {
230            box_y1 = pSrcDrawable->y;
231            fastExpose = FALSE;
232        }
233        if (box_x2 > pSrcDrawable->x + (int) pSrcDrawable->width) {
234            box_x2 = pSrcDrawable->x + (int) pSrcDrawable->width;
235            fastExpose = FALSE;
236        }
237        if (box_y2 > pSrcDrawable->y + (int) pSrcDrawable->height) {
238            box_y2 = pSrcDrawable->y + (int) pSrcDrawable->height;
239            fastExpose = FALSE;
240        }
241
242        /* Translate and clip the dst to the destination composite clip */
243        box_x1 -= dx;
244        box_x2 -= dx;
245        box_y1 -= dy;
246        box_y2 -= dy;
247
248        /* If the destination composite clip is one rectangle we can
249           do the clip directly.  Otherwise we have to create a full
250           blown region and call intersect */
251
252        cclip = miGetCompositeClip(pGC);
253        if (RegionNumRects(cclip) == 1) {
254            BoxPtr pBox = RegionRects(cclip);
255
256            if (box_x1 < pBox->x1)
257                box_x1 = pBox->x1;
258            if (box_x2 > pBox->x2)
259                box_x2 = pBox->x2;
260            if (box_y1 < pBox->y1)
261                box_y1 = pBox->y1;
262            if (box_y2 > pBox->y2)
263                box_y2 = pBox->y2;
264            fastDst = TRUE;
265        }
266    }
267
268    /* Check to see if the region is empty */
269    if (box_x1 >= box_x2 || box_y1 >= box_y2) {
270        RegionNull(&rgnDst);
271    }
272    else {
273        BoxRec box;
274
275        box.x1 = box_x1;
276        box.y1 = box_y1;
277        box.x2 = box_x2;
278        box.y2 = box_y2;
279        RegionInit(&rgnDst, &box, 1);
280    }
281
282    /* Clip against complex source if needed */
283    if (!fastSrc) {
284        RegionIntersect(&rgnDst, &rgnDst, prgnSrcClip);
285        RegionTranslate(&rgnDst, -dx, -dy);
286    }
287
288    /* Clip against complex dest if needed */
289    if (!fastDst) {
290        RegionIntersect(&rgnDst, &rgnDst, miGetCompositeClip(pGC));
291    }
292
293    /* Do bit blitting */
294    numRects = RegionNumRects(&rgnDst);
295    if (numRects && widthSrc && heightSrc)
296        miCopyRegion(pSrcDrawable, pDstDrawable, pGC,
297                     &rgnDst, dx, dy, copyProc, bitPlane, closure);
298
299    /* Pixmap sources generate a NoExposed (we return NULL to do this) */
300    if (!fastExpose && pGC->fExpose)
301        prgnExposed = miHandleExposures(pSrcDrawable, pDstDrawable, pGC,
302                                        xIn - pSrcDrawable->x,
303                                        yIn - pSrcDrawable->y,
304                                        widthSrc, heightSrc,
305                                        xOut - pDstDrawable->x,
306                                        yOut - pDstDrawable->y);
307    RegionUninit(&rgnDst);
308    if (freeSrcClip)
309        RegionDestroy(prgnSrcClip);
310    return prgnExposed;
311}
312