1/*
2 *
3 * Copyright © 2000 Keith Packard
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, and that the name of Keith Packard not be used in
10 * advertising or publicity pertaining to distribution of the software without
11 * specific, written prior permission.  Keith Packard makes no
12 * representations about the suitability of this software for any purpose.  It
13 * is provided "as is" without express or implied warranty.
14 *
15 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
19 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
20 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21 * PERFORMANCE OF THIS SOFTWARE.
22 */
23
24/*
25 * Thanks to Daniel Chemko <dchemko@intrinsyc.com> for making the 90 and 180
26 * orientations work.
27 */
28
29#ifdef HAVE_DIX_CONFIG_H
30#include <dix-config.h>
31#endif
32
33#include <stdlib.h>
34
35#include    <X11/X.h>
36#include    "scrnintstr.h"
37#include    "windowstr.h"
38#include    <X11/fonts/font.h>
39#include    "dixfontstr.h"
40#include    <X11/fonts/fontstruct.h>
41#include    "mi.h"
42#include    "regionstr.h"
43#include    "globals.h"
44#include    "gcstruct.h"
45#include    "shadow.h"
46#include    "fb.h"
47
48#define DANDEBUG         0
49
50#if ROTATE == 270
51
52#define SCRLEFT(x,y,w,h)    (pScreen->height - ((y) + (h)))
53#define SCRY(x,y,w,h)	    (x)
54#define SCRWIDTH(x,y,w,h)   (h)
55#define FIRSTSHA(x,y,w,h)   (((y) + (h) - 1) * shaStride + (x))
56#define STEPDOWN(x,y,w,h)   ((w)--)
57#define NEXTY(x,y,w,h)	    ((x)++)
58#define SHASTEPX(stride)    -(stride)
59#define SHASTEPY(stride)    (1)
60
61#elif ROTATE == 90
62
63#define SCRLEFT(x,y,w,h)    (y)
64#define SCRY(x,y,w,h)	    (pScreen->width - ((x) + (w)) - 1)
65#define SCRWIDTH(x,y,w,h)   (h)
66#define FIRSTSHA(x,y,w,h)   ((y) * shaStride + (x + w - 1))
67#define STEPDOWN(x,y,w,h)   ((w)--)
68#define NEXTY(x,y,w,h)	    ((void)(x))
69#define SHASTEPX(stride)    (stride)
70#define SHASTEPY(stride)    (-1)
71
72#elif ROTATE == 180
73
74#define SCRLEFT(x,y,w,h)    (pScreen->width - ((x) + (w)))
75#define SCRY(x,y,w,h)	    (pScreen->height - ((y) + (h)) - 1)
76#define SCRWIDTH(x,y,w,h)   (w)
77#define FIRSTSHA(x,y,w,h)   ((y + h - 1) * shaStride + (x + w - 1))
78#define STEPDOWN(x,y,w,h)   ((h)--)
79#define NEXTY(x,y,w,h)	    ((void)(y))
80#define SHASTEPX(stride)    (-1)
81#define SHASTEPY(stride)    -(stride)
82
83#else
84
85#define SCRLEFT(x,y,w,h)    (x)
86#define SCRY(x,y,w,h)	    (y)
87#define SCRWIDTH(x,y,w,h)   (w)
88#define FIRSTSHA(x,y,w,h)   ((y) * shaStride + (x))
89#define STEPDOWN(x,y,w,h)   ((h)--)
90#define NEXTY(x,y,w,h)	    ((y)++)
91#define SHASTEPX(stride)    (1)
92#define SHASTEPY(stride)    (stride)
93
94#endif
95
96void
97FUNC(ScreenPtr pScreen, shadowBufPtr pBuf)
98{
99    RegionPtr damage = DamageRegion(pBuf->pDamage);
100    PixmapPtr pShadow = pBuf->pPixmap;
101    int nbox = RegionNumRects(damage);
102    BoxPtr pbox = RegionRects(damage);
103    FbBits *shaBits;
104    Data *shaBase, *shaLine, *sha;
105    FbStride shaStride;
106    int scrBase, scrLine, scr;
107    int shaBpp;
108    _X_UNUSED int shaXoff, shaYoff;
109    int x, y, w, h, width;
110    int i;
111    Data *winBase = NULL, *win;
112    CARD32 winSize;
113
114    fbGetDrawable(&pShadow->drawable, shaBits, shaStride, shaBpp, shaXoff,
115                  shaYoff);
116    shaBase = (Data *) shaBits;
117    shaStride = shaStride * sizeof(FbBits) / sizeof(Data);
118#if (DANDEBUG > 1)
119    ErrorF
120        ("-> Entering Shadow Update:\r\n   |- Origins: pShadow=%x, pScreen=%x, damage=%x\r\n   |- Metrics: shaStride=%d, shaBase=%x, shaBpp=%d\r\n   |                                                     \n",
121         pShadow, pScreen, damage, shaStride, shaBase, shaBpp);
122#endif
123    while (nbox--) {
124        x = pbox->x1;
125        y = pbox->y1;
126        w = (pbox->x2 - pbox->x1);
127        h = pbox->y2 - pbox->y1;
128
129#if (DANDEBUG > 2)
130        ErrorF
131            ("   |-> Redrawing box - Metrics: X=%d, Y=%d, Width=%d, Height=%d\n",
132             x, y, w, h);
133#endif
134        scrLine = SCRLEFT(x, y, w, h);
135        shaLine = shaBase + FIRSTSHA(x, y, w, h);
136
137        while (STEPDOWN(x, y, w, h)) {
138            winSize = 0;
139            scrBase = 0;
140            width = SCRWIDTH(x, y, w, h);
141            scr = scrLine;
142            sha = shaLine;
143#if (DANDEBUG > 3)
144            ErrorF("   |   |-> StepDown - Metrics: width=%d, scr=%x, sha=%x\n",
145                   width, scr, sha);
146#endif
147            while (width) {
148                /*  how much remains in this window */
149                i = scrBase + winSize - scr;
150                if (i <= 0 || scr < scrBase) {
151                    winBase = (Data *) (*pBuf->window) (pScreen,
152                                                        SCRY(x, y, w, h),
153                                                        scr * sizeof(Data),
154                                                        SHADOW_WINDOW_WRITE,
155                                                        &winSize,
156                                                        pBuf->closure);
157                    if (!winBase)
158                        return;
159                    scrBase = scr;
160                    winSize /= sizeof(Data);
161                    i = winSize;
162#if(DANDEBUG > 4)
163                    ErrorF
164                        ("   |   |   |-> Starting New Line - Metrics: winBase=%x, scrBase=%x, winSize=%d\r\n   |   |   |   Xstride=%d, Ystride=%d, w=%d h=%d\n",
165                         winBase, scrBase, winSize, SHASTEPX(shaStride),
166                         SHASTEPY(shaStride), w, h);
167#endif
168                }
169                win = winBase + (scr - scrBase);
170                if (i > width)
171                    i = width;
172                width -= i;
173                scr += i;
174#if(DANDEBUG > 5)
175                ErrorF
176                    ("   |   |   |-> Writing Line - Metrics: win=%x, sha=%x\n",
177                     win, sha);
178#endif
179                while (i--) {
180#if(DANDEBUG > 6)
181                    ErrorF
182                        ("   |   |   |-> Writing Pixel - Metrics: win=%x, sha=%d, remaining=%d\n",
183                         win, sha, i);
184#endif
185                    *win++ = *sha;
186                    sha += SHASTEPX(shaStride);
187                }               /*  i */
188            }                   /*  width */
189            shaLine += SHASTEPY(shaStride);
190            NEXTY(x, y, w, h);
191        }                       /*  STEPDOWN */
192        pbox++;
193    }                           /*  nbox */
194}
195