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., 51 Franklin St, Fifth Floor, Boston,
26 #include <X11/Xutil.h>
34 static int get_shifts(unsigned long mask
)
45 #define NORMALIZE_RED(pixel) ((rshift>0) ? ((pixel) & rmask) >> rshift \
46 : ((pixel) & rmask) << -rshift)
47 #define NORMALIZE_GREEN(pixel) ((gshift>0) ? ((pixel) & gmask) >> gshift \
48 : ((pixel) & gmask) << -gshift)
49 #define NORMALIZE_BLUE(pixel) ((bshift>0) ? ((pixel) & bmask) >> bshift \
50 : ((pixel) & bmask) << -bshift)
52 RImage
*RCreateImageFromXImage(RContext
* context
, XImage
* image
, XImage
* mask
)
58 int rshift
, gshift
, bshift
;
59 int rmask
, gmask
, bmask
;
61 assert(image
!= NULL
);
62 assert(image
->format
== ZPixmap
);
63 assert(!mask
|| mask
->format
== ZPixmap
);
65 img
= RCreateImage(image
->width
, image
->height
, mask
!= NULL
);
70 /* I don't know why, but XGetImage() for pixmaps don't set the
71 * {red,green,blue}_mask values correctly.
73 if (context
->depth
== image
->depth
) {
74 rmask
= context
->visual
->red_mask
;
75 gmask
= context
->visual
->green_mask
;
76 bmask
= context
->visual
->blue_mask
;
78 rmask
= image
->red_mask
;
79 gmask
= image
->green_mask
;
80 bmask
= image
->blue_mask
;
83 /* how many bits to shift to normalize the color into 8bpp */
84 rshift
= get_shifts(rmask
) - 8;
85 gshift
= get_shifts(gmask
) - 8;
86 bshift
= get_shifts(bmask
) - 8;
90 if (image
->depth
== 1) {
91 for (y
= 0; y
< image
->height
; y
++) {
92 for (x
= 0; x
< image
->width
; x
++) {
93 pixel
= XGetPixel(image
, x
, y
);
108 for (y
= 0; y
< image
->height
; y
++) {
109 for (x
= 0; x
< image
->width
; x
++) {
110 pixel
= XGetPixel(image
, x
, y
);
111 *(data
++) = NORMALIZE_RED(pixel
);
112 *(data
++) = NORMALIZE_GREEN(pixel
);
113 *(data
++) = NORMALIZE_BLUE(pixel
);
120 #define MIN(a,b) ((a)<(b)?(a):(b))
122 data
= img
->data
+ 3; /* Skip R, G & B */
123 for (y
= 0; y
< MIN(mask
->height
, image
->height
); y
++) {
124 for (x
= 0; x
< MIN(mask
->width
, image
->width
); x
++) {
125 if (mask
->width
<= image
->width
&& XGetPixel(mask
, x
, y
)) {
132 for (; x
< image
->width
; x
++) {
137 for (; y
< image
->height
; y
++) {
138 for (x
= 0; x
< image
->width
; x
++) {
147 RImage
*RCreateImageFromDrawable(RContext
* context
, Drawable drawable
, Pixmap mask
)
151 unsigned int w
, h
, bar
;
155 assert(drawable
!= None
);
157 if (!XGetGeometry(context
->dpy
, drawable
, &baz
, &foo
, &foo
, &w
, &h
, &bar
, &bar
)) {
158 printf("wrlib: invalid window or pixmap passed to RCreateImageFromDrawable\n");
161 pimg
= XGetImage(context
->dpy
, drawable
, 0, 0, w
, h
, AllPlanes
, ZPixmap
);
164 RErrorCode
= RERR_XERROR
;
169 if (XGetGeometry(context
->dpy
, mask
, &baz
, &foo
, &foo
, &w
, &h
, &bar
, &bar
)) {
170 mimg
= XGetImage(context
->dpy
, mask
, 0, 0, w
, h
, AllPlanes
, ZPixmap
);
174 image
= RCreateImageFromXImage(context
, pimg
, mimg
);