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
34 void
miCopyRegion(DrawablePtr pSrcDrawable,DrawablePtr pDstDrawable,GCPtr pGC,RegionPtr pDstRegion,int dx,int dy,miCopyProc copyProc,Pixel bitPlane,void * closure)35 miCopyRegion(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
130 RegionPtr
miDoCopy(DrawablePtr pSrcDrawable,DrawablePtr pDstDrawable,GCPtr pGC,int xIn,int yIn,int widthSrc,int heightSrc,int xOut,int yOut,miCopyProc copyProc,Pixel bitPlane,void * closure)131 miDoCopy(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