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/* xpixmap.c - Make RImage from Pixmap or XImage
*
* Raster graphics library
*
* Copyright (c) 1997-2003 Alfredo K. Kojima
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <config.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "wraster.h"
#include "wr_i18n.h"
static int get_shifts(unsigned long mask)
{
int i = 0;
while (mask) {
mask >>= 1;
i++;
}
return i;
}
#define NORMALIZE_RED(pixel) ((rshift>0) ? ((pixel) & rmask) >> rshift \
: ((pixel) & rmask) << -rshift)
#define NORMALIZE_GREEN(pixel) ((gshift>0) ? ((pixel) & gmask) >> gshift \
: ((pixel) & gmask) << -gshift)
#define NORMALIZE_BLUE(pixel) ((bshift>0) ? ((pixel) & bmask) >> bshift \
: ((pixel) & bmask) << -bshift)
RImage *RCreateImageFromXImage(RContext * context, XImage * image, XImage * mask)
{
RImage *img;
int x, y;
unsigned long pixel;
unsigned char *data;
int rshift, gshift, bshift;
int rmask, gmask, bmask;
assert(image != NULL);
assert(image->format == ZPixmap);
assert(!mask || mask->format == ZPixmap);
img = RCreateImage(image->width, image->height, mask != NULL);
if (!img) {
return NULL;
}
/* I don't know why, but XGetImage() for pixmaps don't set the
* {red,green,blue}_mask values correctly.
*/
if (context->depth == image->depth) {
rmask = context->visual->red_mask;
gmask = context->visual->green_mask;
bmask = context->visual->blue_mask;
} else {
rmask = image->red_mask;
gmask = image->green_mask;
bmask = image->blue_mask;
}
/* how many bits to shift to normalize the color into 8bpp */
rshift = get_shifts(rmask) - 8;
gshift = get_shifts(gmask) - 8;
bshift = get_shifts(bmask) - 8;
data = img->data;
if (image->depth == 1) {
for (y = 0; y < image->height; y++) {
for (x = 0; x < image->width; x++) {
pixel = XGetPixel(image, x, y);
if (pixel) {
*data++ = 0;
*data++ = 0;
*data++ = 0;
} else {
*data++ = 0xff;
*data++ = 0xff;
*data++ = 0xff;
}
if (mask)
data++;
}
}
} else {
for (y = 0; y < image->height; y++) {
for (x = 0; x < image->width; x++) {
pixel = XGetPixel(image, x, y);
*(data++) = NORMALIZE_RED(pixel);
*(data++) = NORMALIZE_GREEN(pixel);
*(data++) = NORMALIZE_BLUE(pixel);
if (mask)
data++;
}
}
}
#define MIN(a,b) ((a)<(b)?(a):(b))
if (mask) {
data = img->data + 3; /* Skip R, G & B */
for (y = 0; y < MIN(mask->height, image->height); y++) {
for (x = 0; x < MIN(mask->width, image->width); x++) {
if (mask->width <= image->width && XGetPixel(mask, x, y)) {
*data = 0xff;
} else {
*data = 0;
}
data += 4;
}
for (; x < image->width; x++) {
*data = 0;
data += 4;
}
}
for (; y < image->height; y++) {
for (x = 0; x < image->width; x++) {
*data = 0;
data += 4;
}
}
}
return img;
}
RImage *RCreateImageFromDrawable(RContext * context, Drawable drawable, Pixmap mask)
{
RImage *image;
XImage *pimg, *mimg;
unsigned int w, h, bar;
int foo;
Window baz;
assert(drawable != None);
if (!XGetGeometry(context->dpy, drawable, &baz, &foo, &foo, &w, &h, &bar, &bar)) {
fprintf(stderr, _("wrlib: invalid window or pixmap passed to RCreateImageFromDrawable\n"));
return NULL;
}
pimg = XGetImage(context->dpy, drawable, 0, 0, w, h, AllPlanes, ZPixmap);
if (!pimg) {
RErrorCode = RERR_XERROR;
return NULL;
}
mimg = NULL;
if (mask) {
if (XGetGeometry(context->dpy, mask, &baz, &foo, &foo, &w, &h, &bar, &bar)) {
mimg = XGetImage(context->dpy, mask, 0, 0, w, h, AllPlanes, ZPixmap);
}
}
image = RCreateImageFromXImage(context, pimg, mimg);
XDestroyImage(pimg);
if (mimg)
XDestroyImage(mimg);
return image;
}
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