xaaBitBlt.c revision 706f2543 
1
2/*
3   This is a lighter version of cfbBitBlt.  We calculate the boxes
4   when accelerating pixmap->screen and screen->screen copies.
5   We also pass the GC to the doBitBlt function so that it has access
6   to the fg and bg so CopyPlane can use this.
7*/
8
9#ifdef HAVE_XORG_CONFIG_H
10#include <xorg-config.h>
11#endif
12
13#include "misc.h"
14#include "xf86.h"
15#include "xf86_OSproc.h"
16
17#include <X11/X.h>
18#include "mi.h"
19#include "pixmapstr.h"
20#include "gcstruct.h"
21#include "windowstr.h"
22#include "xaalocal.h"
23
24
25RegionPtr
26XAABitBlt(
27    DrawablePtr pSrcDrawable,
28    DrawablePtr pDstDrawable,
29    GC *pGC,
30    int srcx, int srcy,
31    int width, int height,
32    int dstx, int dsty,
33    void (*doBitBlt)(DrawablePtr, DrawablePtr, GCPtr, RegionPtr, DDXPointPtr),
34    unsigned long bitPlane )
35{
36
37    RegionPtr prgnSrcClip = NULL; /* may be a new region, or just a copy */
38    RegionPtr prgnExposed;
39    Bool freeSrcClip = FALSE;
40    RegionRec rgnDst;
41    DDXPointPtr pptSrc, ppt;
42    DDXPointRec origDest;
43    BoxPtr pbox;
44    BoxRec fastBox;
45    int i, dx, dy, numRects;
46    xRectangle origSource;
47    int fastClip = 0;		/* for fast clipping with pixmap source */
48    int fastExpose = 0;		/* for fast exposures with pixmap source */
49
50    origSource.x = srcx;
51    origSource.y = srcy;
52    origSource.width = width;
53    origSource.height = height;
54    origDest.x = dstx;
55    origDest.y = dsty;
56
57    if (pSrcDrawable->pScreen->SourceValidate) {
58	(*pSrcDrawable->pScreen->SourceValidate) (
59			pSrcDrawable, srcx, srcy, width, height,
60			pGC->subWindowMode);
61    }
62
63    srcx += pSrcDrawable->x;
64    srcy += pSrcDrawable->y;
65
66    /* clip the source */
67    if (pSrcDrawable->type == DRAWABLE_PIXMAP) {
68	if ((pSrcDrawable == pDstDrawable) && (pGC->clientClipType == CT_NONE))
69	    prgnSrcClip = pGC->pCompositeClip;
70	else
71	    fastClip = 1;
72    } else {	/* Window */
73	if (pGC->subWindowMode == IncludeInferiors) {
74	    if (!((WindowPtr) pSrcDrawable)->parent) {
75		/*
76		 * special case bitblt from root window in
77		 * IncludeInferiors mode; just like from a pixmap
78		 */
79		fastClip = 1;
80	    } else if ((pSrcDrawable == pDstDrawable) &&
81		(pGC->clientClipType == CT_NONE)) {
82		prgnSrcClip = pGC->pCompositeClip;
83	    } else {
84		prgnSrcClip = NotClippedByChildren((WindowPtr)pSrcDrawable);
85		freeSrcClip = TRUE;
86	    }
87	} else {
88	    prgnSrcClip = &((WindowPtr)pSrcDrawable)->clipList;
89	}
90    }
91
92    fastBox.x1 = srcx;
93    fastBox.y1 = srcy;
94    fastBox.x2 = srcx + width;
95    fastBox.y2 = srcy + height;
96
97    /* Don't create a source region if we are doing a fast clip */
98    if (fastClip) {
99	fastExpose = 1;
100	/*
101	 * clip the source; if regions extend beyond the source size,
102 	 * make sure exposure events get sent
103	 */
104	if (fastBox.x1 < pSrcDrawable->x) {
105	    fastBox.x1 = pSrcDrawable->x;
106	    fastExpose = 0;
107	}
108	if (fastBox.y1 < pSrcDrawable->y) {
109	    fastBox.y1 = pSrcDrawable->y;
110	    fastExpose = 0;
111	}
112	if (fastBox.x2 > pSrcDrawable->x + (int) pSrcDrawable->width) {
113	    fastBox.x2 = pSrcDrawable->x + (int) pSrcDrawable->width;
114	    fastExpose = 0;
115	}
116	if (fastBox.y2 > pSrcDrawable->y + (int) pSrcDrawable->height) {
117	    fastBox.y2 = pSrcDrawable->y + (int) pSrcDrawable->height;
118	    fastExpose = 0;
119	}
120    } else {
121	RegionInit(&rgnDst, &fastBox, 1);
122	RegionIntersect(&rgnDst, &rgnDst, prgnSrcClip);
123    }
124
125    dstx += pDstDrawable->x;
126    dsty += pDstDrawable->y;
127
128    if (pDstDrawable->type == DRAWABLE_WINDOW) {
129	if (!((WindowPtr)pDstDrawable)->realized) {
130	    if (!fastClip)
131		RegionUninit(&rgnDst);
132	    if (freeSrcClip)
133		RegionDestroy(prgnSrcClip);
134	    return NULL;
135	}
136    }
137
138    dx = srcx - dstx;
139    dy = srcy - dsty;
140
141    /* Translate and clip the dst to the destination composite clip */
142    if (fastClip) {
143	RegionPtr cclip;
144
145        /* Translate the region directly */
146        fastBox.x1 -= dx;
147        fastBox.x2 -= dx;
148        fastBox.y1 -= dy;
149        fastBox.y2 -= dy;
150
151	/* If the destination composite clip is one rectangle we can
152	   do the clip directly.  Otherwise we have to create a full
153	   blown region and call intersect */
154
155	cclip = pGC->pCompositeClip;
156        if (RegionNumRects(cclip) == 1) {
157	    BoxPtr pBox = RegionRects(cclip);
158
159	    if (fastBox.x1 < pBox->x1) fastBox.x1 = pBox->x1;
160	    if (fastBox.x2 > pBox->x2) fastBox.x2 = pBox->x2;
161	    if (fastBox.y1 < pBox->y1) fastBox.y1 = pBox->y1;
162	    if (fastBox.y2 > pBox->y2) fastBox.y2 = pBox->y2;
163
164	    /* Check to see if the region is empty */
165	    if (fastBox.x1 >= fastBox.x2 || fastBox.y1 >= fastBox.y2) {
166		RegionNull(&rgnDst);
167	    } else {
168		RegionInit(&rgnDst, &fastBox, 1);
169	    }
170	} else {
171	    /* We must turn off fastClip now, since we must create
172	       a full blown region.  It is intersected with the
173	       composite clip below. */
174	    fastClip = 0;
175	    RegionInit(&rgnDst, &fastBox,1);
176	}
177    } else {
178        RegionTranslate(&rgnDst, -dx, -dy);
179    }
180
181    if (!fastClip) {
182	RegionIntersect(&rgnDst, &rgnDst,
183				 pGC->pCompositeClip);
184    }
185
186    /* Do bit blitting */
187    numRects = RegionNumRects(&rgnDst);
188    if (numRects && width && height) {
189	if(!(pptSrc = (DDXPointPtr)malloc(numRects *
190						  sizeof(DDXPointRec)))) {
191	    RegionUninit(&rgnDst);
192	    if (freeSrcClip)
193		RegionDestroy(prgnSrcClip);
194	    return NULL;
195	}
196	pbox = RegionRects(&rgnDst);
197	ppt = pptSrc;
198	for (i = numRects; --i >= 0; pbox++, ppt++) {
199	    ppt->x = pbox->x1 + dx;
200	    ppt->y = pbox->y1 + dy;
201	}
202
203	(*doBitBlt) (pSrcDrawable, pDstDrawable, pGC, &rgnDst, pptSrc);
204	free(pptSrc);
205    }
206
207    prgnExposed = NULL;
208    if (pGC->fExpose) {
209        /* Pixmap sources generate a NoExposed (we return NULL to do this) */
210        if (!fastExpose)
211	    prgnExposed = miHandleExposures(pSrcDrawable, pDstDrawable, pGC,
212				  origSource.x, origSource.y,
213				  (int)origSource.width,
214				  (int)origSource.height,
215				  origDest.x, origDest.y, bitPlane);
216    }
217    RegionUninit(&rgnDst);
218    if (freeSrcClip)
219	RegionDestroy(prgnSrcClip);
220    return prgnExposed;
221}
222