1 /* xpixmap.c - Make RImage from Pixmap or XImage
3 * Raster graphics library
5 * Copyright (c) 1997-2003 Alfredo K. Kojima
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free
19 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <X11/Xutil.h>
33 static int get_shifts(unsigned long mask
)
44 #define NORMALIZE_RED(pixel) ((rshift>0) ? ((pixel) & rmask) >> rshift \
45 : ((pixel) & rmask) << -rshift)
46 #define NORMALIZE_GREEN(pixel) ((gshift>0) ? ((pixel) & gmask) >> gshift \
47 : ((pixel) & gmask) << -gshift)
48 #define NORMALIZE_BLUE(pixel) ((bshift>0) ? ((pixel) & bmask) >> bshift \
49 : ((pixel) & bmask) << -bshift)
51 RImage
*RCreateImageFromXImage(RContext
* context
, XImage
* image
, XImage
* mask
)
57 int rshift
, gshift
, bshift
;
58 int rmask
, gmask
, bmask
;
60 assert(image
!= NULL
);
61 assert(image
->format
== ZPixmap
);
62 assert(!mask
|| mask
->format
== ZPixmap
);
64 img
= RCreateImage(image
->width
, image
->height
, mask
!= NULL
);
69 /* I don't know why, but XGetImage() for pixmaps don't set the
70 * {red,green,blue}_mask values correctly.
72 if (context
->depth
== image
->depth
) {
73 rmask
= context
->visual
->red_mask
;
74 gmask
= context
->visual
->green_mask
;
75 bmask
= context
->visual
->blue_mask
;
77 rmask
= image
->red_mask
;
78 gmask
= image
->green_mask
;
79 bmask
= image
->blue_mask
;
82 /* how many bits to shift to normalize the color into 8bpp */
83 rshift
= get_shifts(rmask
) - 8;
84 gshift
= get_shifts(gmask
) - 8;
85 bshift
= get_shifts(bmask
) - 8;
89 if (image
->depth
== 1) {
90 for (y
= 0; y
< image
->height
; y
++) {
91 for (x
= 0; x
< image
->width
; x
++) {
92 pixel
= XGetPixel(image
, x
, y
);
107 for (y
= 0; y
< image
->height
; y
++) {
108 for (x
= 0; x
< image
->width
; x
++) {
109 pixel
= XGetPixel(image
, x
, y
);
110 *(data
++) = NORMALIZE_RED(pixel
);
111 *(data
++) = NORMALIZE_GREEN(pixel
);
112 *(data
++) = NORMALIZE_BLUE(pixel
);
119 #define MIN(a,b) ((a)<(b)?(a):(b))
121 data
= img
->data
+ 3; /* Skip R, G & B */
122 for (y
= 0; y
< MIN(mask
->height
, image
->height
); y
++) {
123 for (x
= 0; x
< MIN(mask
->width
, image
->width
); x
++) {
124 if (mask
->width
<= image
->width
&& XGetPixel(mask
, x
, y
)) {
131 for (; x
< image
->width
; x
++) {
136 for (; y
< image
->height
; y
++) {
137 for (x
= 0; x
< image
->width
; x
++) {
146 RImage
*RCreateImageFromDrawable(RContext
* context
, Drawable drawable
, Pixmap mask
)
150 unsigned int w
, h
, bar
;
154 assert(drawable
!= None
);
156 if (!XGetGeometry(context
->dpy
, drawable
, &baz
, &foo
, &foo
, &w
, &h
, &bar
, &bar
)) {
157 printf("wrlib: invalid window or pixmap passed to RCreateImageFromPixmap\n");
160 pimg
= XGetImage(context
->dpy
, drawable
, 0, 0, w
, h
, AllPlanes
, ZPixmap
);
163 RErrorCode
= RERR_XERROR
;
168 if (XGetGeometry(context
->dpy
, mask
, &baz
, &foo
, &foo
, &w
, &h
, &bar
, &bar
)) {
169 mimg
= XGetImage(context
->dpy
, mask
, 0, 0, w
, h
, AllPlanes
, ZPixmap
);
173 image
= RCreateImageFromXImage(context
, pimg
, mimg
);