1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
3 gradient.c for the Openbox window manager
4 Copyright (c) 2006 Mikael Magnusson
5 Copyright (c) 2003-2007 Dana Jansens
6 Copyright (c) 2003 Derek Foreman
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 See the COPYING file for a copy of the GNU General Public License.
26 static void highlight(RrSurface
*s
, RrPixel32
*x
, RrPixel32
*y
, gboolean raised
);
27 static void gradient_parentrelative(RrAppearance
*a
, gint w
, gint h
);
28 static void gradient_solid(RrAppearance
*l
, gint w
, gint h
);
29 static void gradient_splitvertical(RrAppearance
*a
, gint w
, gint h
);
30 static void gradient_vertical(RrSurface
*sf
, gint w
, gint h
);
31 static void gradient_horizontal(RrSurface
*sf
, gint w
, gint h
);
32 static void gradient_mirrorhorizontal(RrSurface
*sf
, gint w
, gint h
);
33 static void gradient_diagonal(RrSurface
*sf
, gint w
, gint h
);
34 static void gradient_crossdiagonal(RrSurface
*sf
, gint w
, gint h
);
35 static void gradient_pyramid(RrSurface
*sf
, gint inw
, gint inh
);
37 void RrRender(RrAppearance
*a
, gint w
, gint h
)
39 RrPixel32
*data
= a
->surface
.pixel_data
;
44 switch (a
->surface
.grad
) {
45 case RR_SURFACE_PARENTREL
:
46 gradient_parentrelative(a
, w
, h
);
48 case RR_SURFACE_SOLID
:
49 gradient_solid(a
, w
, h
);
51 case RR_SURFACE_SPLIT_VERTICAL
:
52 gradient_splitvertical(a
, w
, h
);
54 case RR_SURFACE_VERTICAL
:
55 gradient_vertical(&a
->surface
, w
, h
);
57 case RR_SURFACE_HORIZONTAL
:
58 gradient_horizontal(&a
->surface
, w
, h
);
60 case RR_SURFACE_MIRROR_HORIZONTAL
:
61 gradient_mirrorhorizontal(&a
->surface
, w
, h
);
63 case RR_SURFACE_DIAGONAL
:
64 gradient_diagonal(&a
->surface
, w
, h
);
66 case RR_SURFACE_CROSS_DIAGONAL
:
67 gradient_crossdiagonal(&a
->surface
, w
, h
);
69 case RR_SURFACE_PYRAMID
:
70 gradient_pyramid(&a
->surface
, w
, h
);
73 g_assert_not_reached(); /* unhandled gradient */
77 if (a
->surface
.interlaced
) {
81 r
= a
->surface
.interlace_color
->r
;
82 g
= a
->surface
.interlace_color
->g
;
83 b
= a
->surface
.interlace_color
->b
;
84 current
= (r
<< RrDefaultRedOffset
)
85 + (g
<< RrDefaultGreenOffset
)
86 + (b
<< RrDefaultBlueOffset
);
88 for (i
= 0; i
< h
; i
+= 2, p
+= w
)
89 for (x
= 0; x
< w
; ++x
, ++p
)
93 if (a
->surface
.relief
== RR_RELIEF_FLAT
&& a
->surface
.border
) {
94 r
= a
->surface
.border_color
->r
;
95 g
= a
->surface
.border_color
->g
;
96 b
= a
->surface
.border_color
->b
;
97 current
= (r
<< RrDefaultRedOffset
)
98 + (g
<< RrDefaultGreenOffset
)
99 + (b
<< RrDefaultBlueOffset
);
100 for (off
= 0, x
= 0; x
< w
; ++x
, off
++) {
101 *(data
+ off
) = current
;
102 *(data
+ off
+ ((h
-1) * w
)) = current
;
104 for (off
= 0, x
= 0; x
< h
; ++x
, off
++) {
105 *(data
+ (off
* w
)) = current
;
106 *(data
+ (off
* w
) + w
- 1) = current
;
110 if (a
->surface
.relief
!= RR_RELIEF_FLAT
) {
111 if (a
->surface
.bevel
== RR_BEVEL_1
) {
112 for (off
= 1, x
= 1; x
< w
- 1; ++x
, off
++)
113 highlight(&a
->surface
, data
+ off
,
114 data
+ off
+ (h
-1) * w
,
115 a
->surface
.relief
==RR_RELIEF_RAISED
);
116 for (off
= 0, x
= 0; x
< h
; ++x
, off
++)
117 highlight(&a
->surface
, data
+ off
* w
,
118 data
+ off
* w
+ w
- 1,
119 a
->surface
.relief
==RR_RELIEF_RAISED
);
122 if (a
->surface
.bevel
== RR_BEVEL_2
) {
123 for (off
= 2, x
= 2; x
< w
- 2; ++x
, off
++)
124 highlight(&a
->surface
, data
+ off
+ w
,
125 data
+ off
+ (h
-2) * w
,
126 a
->surface
.relief
==RR_RELIEF_RAISED
);
127 for (off
= 1, x
= 1; x
< h
-1; ++x
, off
++)
128 highlight(&a
->surface
, data
+ off
* w
+ 1,
129 data
+ off
* w
+ w
- 2,
130 a
->surface
.relief
==RR_RELIEF_RAISED
);
135 static void highlight(RrSurface
*s
, RrPixel32
*x
, RrPixel32
*y
, gboolean raised
)
139 RrPixel32
*up
, *down
;
148 r
= (*up
>> RrDefaultRedOffset
) & 0xFF;
149 r
+= (r
* s
->bevel_light_adjust
) >> 8;
150 g
= (*up
>> RrDefaultGreenOffset
) & 0xFF;
151 g
+= (g
* s
->bevel_light_adjust
) >> 8;
152 b
= (*up
>> RrDefaultBlueOffset
) & 0xFF;
153 b
+= (b
* s
->bevel_light_adjust
) >> 8;
154 if (r
> 0xFF) r
= 0xFF;
155 if (g
> 0xFF) g
= 0xFF;
156 if (b
> 0xFF) b
= 0xFF;
157 *up
= (r
<< RrDefaultRedOffset
) + (g
<< RrDefaultGreenOffset
)
158 + (b
<< RrDefaultBlueOffset
);
160 r
= (*down
>> RrDefaultRedOffset
) & 0xFF;
161 r
-= (r
* s
->bevel_dark_adjust
) >> 8;
162 g
= (*down
>> RrDefaultGreenOffset
) & 0xFF;
163 g
-= (g
* s
->bevel_dark_adjust
) >> 8;
164 b
= (*down
>> RrDefaultBlueOffset
) & 0xFF;
165 b
-= (b
* s
->bevel_dark_adjust
) >> 8;
166 *down
= (r
<< RrDefaultRedOffset
) + (g
<< RrDefaultGreenOffset
)
167 + (b
<< RrDefaultBlueOffset
);
170 static void create_bevel_colors(RrAppearance
*l
)
175 r
= l
->surface
.primary
->r
;
176 r
+= (r
* l
->surface
.bevel_light_adjust
) >> 8;
177 g
= l
->surface
.primary
->g
;
178 g
+= (g
* l
->surface
.bevel_light_adjust
) >> 8;
179 b
= l
->surface
.primary
->b
;
180 b
+= (b
* l
->surface
.bevel_light_adjust
) >> 8;
181 if (r
> 0xFF) r
= 0xFF;
182 if (g
> 0xFF) g
= 0xFF;
183 if (b
> 0xFF) b
= 0xFF;
184 g_assert(!l
->surface
.bevel_light
);
185 l
->surface
.bevel_light
= RrColorNew(l
->inst
, r
, g
, b
);
188 r
= l
->surface
.primary
->r
;
189 r
-= (r
* l
->surface
.bevel_dark_adjust
) >> 8;
190 g
= l
->surface
.primary
->g
;
191 g
-= (g
* l
->surface
.bevel_dark_adjust
) >> 8;
192 b
= l
->surface
.primary
->b
;
193 b
-= (b
* l
->surface
.bevel_dark_adjust
) >> 8;
194 g_assert(!l
->surface
.bevel_dark
);
195 l
->surface
.bevel_dark
= RrColorNew(l
->inst
, r
, g
, b
);
198 static void gradient_parentrelative(RrAppearance
*a
, gint w
, gint h
)
200 RrPixel32
*source
, *dest
;
201 gint sw
, sh
, partial_w
, partial_h
, i
;
203 g_assert (a
->surface
.parent
);
204 g_assert (a
->surface
.parent
->w
);
206 sw
= a
->surface
.parent
->w
;
207 sh
= a
->surface
.parent
->h
;
209 /* This is a little hack. When a texture is parentrelative, and the same
210 area as the parent, and has a bevel, it will draw its bevel on top
211 of the parent's, amplifying it. So instead, rerender the child with
212 the parent's settings, but the child's bevel and interlace */
213 if (a
->surface
.relief
!= RR_RELIEF_FLAT
&&
214 (a
->surface
.parent
->surface
.relief
!= RR_RELIEF_FLAT
||
215 a
->surface
.parent
->surface
.border
) &&
216 !a
->surface
.parentx
&& !a
->surface
.parenty
&&
219 RrSurface old
= a
->surface
;
220 a
->surface
= a
->surface
.parent
->surface
;
222 /* turn these off for the parent */
223 a
->surface
.relief
= RR_RELIEF_FLAT
;
224 a
->surface
.border
= FALSE
;
226 a
->surface
.pixel_data
= old
.pixel_data
;
231 source
= (a
->surface
.parent
->surface
.pixel_data
+
232 a
->surface
.parentx
+ sw
* a
->surface
.parenty
);
233 dest
= a
->surface
.pixel_data
;
235 if (a
->surface
.parentx
+ w
> sw
) {
236 partial_w
= sw
- a
->surface
.parentx
;
237 } else partial_w
= w
;
239 if (a
->surface
.parenty
+ h
> sh
) {
240 partial_h
= sh
- a
->surface
.parenty
;
241 } else partial_h
= h
;
243 for (i
= 0; i
< partial_h
; i
++, source
+= sw
, dest
+= w
) {
244 memcpy(dest
, source
, partial_w
* sizeof(RrPixel32
));
249 static void gradient_solid(RrAppearance
*l
, gint w
, gint h
)
253 RrPixel32
*data
= l
->surface
.pixel_data
;
254 RrSurface
*sp
= &l
->surface
;
255 gint left
= 0, top
= 0, right
= w
- 1, bottom
= h
- 1;
257 pix
= (sp
->primary
->r
<< RrDefaultRedOffset
)
258 + (sp
->primary
->g
<< RrDefaultGreenOffset
)
259 + (sp
->primary
->b
<< RrDefaultBlueOffset
);
261 for (i
= 0; i
< w
* h
; i
++)
267 XFillRectangle(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->primary
),
270 switch (sp
->relief
) {
271 case RR_RELIEF_RAISED
:
273 create_bevel_colors(l
);
277 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
278 left
, bottom
, right
, bottom
);
279 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
280 right
, bottom
, right
, top
);
282 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
283 left
, top
, right
, top
);
284 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
285 left
, bottom
, left
, top
);
288 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
289 left
+ 2, bottom
- 1, right
- 2, bottom
- 1);
290 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
291 right
- 1, bottom
- 1, right
- 1, top
+ 1);
293 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
294 left
+ 2, top
+ 1, right
- 2, top
+ 1);
295 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
296 left
+ 1, bottom
- 1, left
+ 1, top
+ 1);
299 g_assert_not_reached(); /* unhandled BevelType */
302 case RR_RELIEF_SUNKEN
:
304 create_bevel_colors(l
);
308 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
309 left
, bottom
, right
, bottom
);
310 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
311 right
, bottom
, right
, top
);
313 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
314 left
, top
, right
, top
);
315 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
316 left
, bottom
, left
, top
);
319 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
320 left
+ 2, bottom
- 1, right
- 2, bottom
- 1);
321 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
,RrColorGC(sp
->bevel_light
),
322 right
- 1, bottom
- 1, right
- 1, top
+ 1);
324 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
325 left
+ 2, top
+ 1, right
- 2, top
+ 1);
326 XDrawLine(RrDisplay(l
->inst
), l
->pixmap
, RrColorGC(sp
->bevel_dark
),
327 left
+ 1, bottom
- 1, left
+ 1, top
+ 1);
330 g_assert_not_reached(); /* unhandled BevelType */
335 XDrawRectangle(RrDisplay(l
->inst
), l
->pixmap
,
336 RrColorGC(sp
->border_color
),
337 left
, top
, right
, bottom
);
341 g_assert_not_reached(); /* unhandled ReliefType */
345 /* * * * * * * * * * * * * * GRADIENT MAGIC WOOT * * * * * * * * * * * * * * */
349 gint len##x, cdelta##x[3], error##x[3] = { 0, 0, 0 }, inc##x[3]; \
350 gboolean bigslope##x[3] /* color slope > 1 */
352 #define SETUP(x, from, to, w) \
355 color##x[0] = from->r; \
356 color##x[1] = from->g; \
357 color##x[2] = from->b; \
359 cdelta##x[0] = to->r - from->r; \
360 cdelta##x[1] = to->g - from->g; \
361 cdelta##x[2] = to->b - from->b; \
363 if (cdelta##x[0] < 0) { \
364 cdelta##x[0] = -cdelta##x[0]; \
368 if (cdelta##x[1] < 0) { \
369 cdelta##x[1] = -cdelta##x[1]; \
373 if (cdelta##x[2] < 0) { \
374 cdelta##x[2] = -cdelta##x[2]; \
378 bigslope##x[0] = cdelta##x[0] > w;\
379 bigslope##x[1] = cdelta##x[1] > w;\
380 bigslope##x[2] = cdelta##x[2] > w
382 #define COLOR_RR(x, c) \
383 c->r = color##x[0]; \
384 c->g = color##x[1]; \
388 ((color##x[0] << RrDefaultRedOffset) + \
389 (color##x[1] << RrDefaultGreenOffset) + \
390 (color##x[2] << RrDefaultBlueOffset))
392 #define INCREMENT(x, i) \
398 for (i = 2; i >= 0; --i) { \
399 if (!cdelta##x[i]) continue; \
401 if (!bigslope##x[i]) { \
402 /* Y (color) is dependant on X */ \
403 error##x[i] += cdelta##x[i]; \
404 if ((error##x[i] << 1) >= len##x) { \
405 color##x[i] += INCREMENT(x, i); \
406 error##x[i] -= len##x; \
409 /* X is dependant on Y (color) */ \
411 color##x[i] += INCREMENT(x, i); \
412 error##x[i] += len##x; \
413 if ((error##x[i] << 1) >= cdelta##x[i]) { \
414 error##x[i] -= cdelta##x[i]; \
422 static void gradient_splitvertical(RrAppearance
*a
, gint w
, gint h
)
424 gint x
, y1
, y2
, y3
, r
, g
, b
;
425 RrSurface
*sf
= &a
->surface
;
426 RrPixel32
*data
= sf
->pixel_data
;
428 RrColor
*primary_light
, *secondary_light
;
429 gint y1sz
, y2sz
, y3sz
;
441 if (r
> 0xFF) r
= 0xFF;
442 if (g
> 0xFF) g
= 0xFF;
443 if (b
> 0xFF) b
= 0xFF;
444 primary_light
= RrColorNew(a
->inst
, r
, g
, b
);
446 r
= sf
->secondary
->r
;
448 g
= sf
->secondary
->g
;
450 b
= sf
->secondary
->b
;
452 if (r
> 0xFF) r
= 0xFF;
453 if (g
> 0xFF) g
= 0xFF;
454 if (b
> 0xFF) b
= 0xFF;
455 secondary_light
= RrColorNew(a
->inst
, r
, g
, b
);
457 y1sz
= MAX(h
/2 - 1, 1);
458 /* setup to get the colors _in between_ these other 2 */
459 y2sz
= (h
< 3 ? 0 : (h
% 2 ? 3 : 2));
460 y3sz
= MAX(h
/2 - 1, 0);
462 SETUP(y1
, primary_light
, sf
->primary
, y1sz
);
464 SETUP(y2
, sf
->primary
, sf
->secondary
, y2sz
);
465 NEXT(y2
); /* skip the first one, its the same as the last of y1 */
467 SETUP(y3
, sf
->secondary
, secondary_light
, y3sz
);
469 for (y1
= y1sz
; y1
> 0; --y1
) {
471 for (x
= w
- 1; x
>= 0; --x
)
477 for (y2
= y2sz
; y2
> 0; --y2
) {
479 for (x
= w
- 1; x
>= 0; --x
)
485 for (y3
= y3sz
; y3
> 0; --y3
) {
487 for (x
= w
- 1; x
>= 0; --x
)
493 RrColorFree(primary_light
);
494 RrColorFree(secondary_light
);
497 static void gradient_horizontal(RrSurface
*sf
, gint w
, gint h
)
500 RrPixel32
*data
= sf
->pixel_data
, *datav
;
504 SETUP(x
, sf
->primary
, sf
->secondary
, w
);
506 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
509 for (y
= h
- 1; y
>= 0; --y
) { /* 0 -> h */
518 for (y
= h
- 1; y
>= 0; --y
) /* 0 -> h */
519 *(data
+ y
* w
) = current
;
522 static void gradient_mirrorhorizontal(RrSurface
*sf
, gint w
, gint h
)
525 RrPixel32
*data
= sf
->pixel_data
, *datav
;
529 SETUP(x
, sf
->primary
, sf
->secondary
, w
/2);
532 for (x
= w
- 1; x
> w
/2-1; --x
) { /* 0 -> w-1 */
535 for (y
= h
- 1; y
>= 0; --y
) { /* 0 -> h */
543 SETUP(x
, sf
->secondary
, sf
->primary
, w
/2);
544 for (x
= w
/2 - 1; x
> 0; --x
) { /* 0 -> w-1 */
547 for (y
= h
- 1; y
>= 0; --y
) { /* 0 -> h */
557 for (y
= h
- 1; y
>= 0; --y
) /* 0 -> h */
558 *(data
+ y
* w
) = current
;
561 static void gradient_vertical(RrSurface
*sf
, gint w
, gint h
)
564 RrPixel32
*data
= sf
->pixel_data
;
568 SETUP(y
, sf
->primary
, sf
->secondary
, h
);
570 for (y
= h
- 1; y
> 0; --y
) { /* 0 -> h-1 */
572 for (x
= w
- 1; x
>= 0; --x
) /* 0 -> w */
578 for (x
= w
- 1; x
>= 0; --x
) /* 0 -> w */
583 static void gradient_diagonal(RrSurface
*sf
, gint w
, gint h
)
586 RrPixel32
*data
= sf
->pixel_data
;
594 extracorner
.r
= (sf
->primary
->r
+ sf
->secondary
->r
) / 2;
595 extracorner
.g
= (sf
->primary
->g
+ sf
->secondary
->g
) / 2;
596 extracorner
.b
= (sf
->primary
->b
+ sf
->secondary
->b
) / 2;
598 SETUP(lefty
, sf
->primary
, (&extracorner
), h
);
599 SETUP(righty
, (&extracorner
), sf
->secondary
, h
);
601 for (y
= h
- 1; y
> 0; --y
) { /* 0 -> h-1 */
602 COLOR_RR(lefty
, (&left
));
603 COLOR_RR(righty
, (&right
));
605 SETUP(x
, (&left
), (&right
), w
);
607 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
608 *(data
++) = COLOR(x
);
612 *(data
++) = COLOR(x
);
617 COLOR_RR(lefty
, (&left
));
618 COLOR_RR(righty
, (&right
));
620 SETUP(x
, (&left
), (&right
), w
);
622 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
623 *(data
++) = COLOR(x
);
630 static void gradient_crossdiagonal(RrSurface
*sf
, gint w
, gint h
)
633 RrPixel32
*data
= sf
->pixel_data
;
641 extracorner
.r
= (sf
->primary
->r
+ sf
->secondary
->r
) / 2;
642 extracorner
.g
= (sf
->primary
->g
+ sf
->secondary
->g
) / 2;
643 extracorner
.b
= (sf
->primary
->b
+ sf
->secondary
->b
) / 2;
645 SETUP(lefty
, (&extracorner
), sf
->secondary
, h
);
646 SETUP(righty
, sf
->primary
, (&extracorner
), h
);
648 for (y
= h
- 1; y
> 0; --y
) { /* 0 -> h-1 */
649 COLOR_RR(lefty
, (&left
));
650 COLOR_RR(righty
, (&right
));
652 SETUP(x
, (&left
), (&right
), w
);
654 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
655 *(data
++) = COLOR(x
);
659 *(data
++) = COLOR(x
);
664 COLOR_RR(lefty
, (&left
));
665 COLOR_RR(righty
, (&right
));
667 SETUP(x
, (&left
), (&right
), w
);
669 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
670 *(data
++) = COLOR(x
);
677 static void gradient_pyramid(RrSurface
*sf
, gint inw
, gint inh
)
679 gint x
, y
, w
= (inw
>> 1) + 1, h
= (inh
>> 1) + 1;
680 RrPixel32
*data
= sf
->pixel_data
;
681 RrPixel32
*end
= data
+ inw
*inh
- 1;
690 extracorner
.r
= (sf
->primary
->r
+ sf
->secondary
->r
) / 2;
691 extracorner
.g
= (sf
->primary
->g
+ sf
->secondary
->g
) / 2;
692 extracorner
.b
= (sf
->primary
->b
+ sf
->secondary
->b
) / 2;
694 SETUP(lefty
, (&extracorner
), sf
->secondary
, h
);
695 SETUP(righty
, sf
->primary
, (&extracorner
), h
);
697 for (y
= h
- 1; y
> 0; --y
) { /* 0 -> h-1 */
698 COLOR_RR(lefty
, (&left
));
699 COLOR_RR(righty
, (&right
));
701 SETUP(x
, (&left
), (&right
), w
);
703 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
706 *(data
+inw
-x
) = current
;
708 *(end
-(inw
-x
)) = current
;
714 *(data
+inw
-x
) = current
;
716 *(end
-(inw
-x
)) = current
;
724 COLOR_RR(lefty
, (&left
));
725 COLOR_RR(righty
, (&right
));
727 SETUP(x
, (&left
), (&right
), w
);
729 for (x
= w
- 1; x
> 0; --x
) { /* 0 -> w-1 */
732 *(data
+inw
-x
) = current
;
734 *(end
-(inw
-x
)) = current
;
740 *(data
+inw
-x
) = current
;
742 *(end
-(inw
-x
)) = current
;