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gtk2/contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlib-drawable.c
Manish Singh 79a042ab38 make proper casts in big endian cases. 
Sat Nov 27 15:18:14 2004  Manish Singh  <yosh@gimp.org>

        * contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlib-drawable.c
        (rgb565amsb, rgb555msb): make proper casts in big endian cases.
2004-11-27 23:19:03 +00:00

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* GdkPixbuf library - convert X drawable information to RGB
*
* Copyright (C) 1999 Michael Zucchi
*
* Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
* Cody Russell <bratsche@dfw.net>
* Federico Mena-Quintero <federico@gimp.org>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* Ported to Xlib by John Harper <john@dcs.warwick.ac.uk> */
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf-private.h>
#include "gdk-pixbuf-xlib-private.h"
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
#define LITTLE
#endif
#define d(x)
static guint32 mask_table[] = {
0x00000000, 0x00000001, 0x00000003, 0x00000007,
0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
0xffffffff
};
/* color handling */
typedef struct xlib_colormap_struct xlib_colormap;
struct xlib_colormap_struct {
int size;
XColor *colors;
Visual *visual;
Colormap colormap;
};
static xlib_colormap *
xlib_get_colormap (Colormap id, Visual *visual)
{
int i;
xlib_colormap *xc = g_new (xlib_colormap, 1);
xc->size = visual->map_entries;
xc->colors = g_new (XColor, xc->size);
xc->visual = visual;
xc->colormap = id;
for (i = 0; i < xc->size; i++) {
xc->colors[i].pixel = i;
xc->colors[i].flags = DoRed | DoGreen | DoBlue;
}
XQueryColors (gdk_pixbuf_dpy, xc->colormap, xc->colors, xc->size);
return xc;
}
static void
xlib_colormap_free (xlib_colormap *xc)
{
g_free (xc->colors);
g_free (xc);
}
/* from gdkvisual.c */
static void
visual_decompose_mask (gulong mask,
gint *shift,
gint *prec)
{
*shift = 0;
*prec = 0;
while (!(mask & 0x1)) {
(*shift)++;
mask >>= 1;
}
while (mask & 0x1) {
(*prec)++;
mask >>= 1;
}
}
static gboolean x_error;
static int
handle_x_error (Display *dpy, XErrorEvent *ev)
{
x_error = TRUE;
return 0;
}
static gboolean
drawable_is_pixmap (Drawable d)
{
/* copied from Imlib */
XErrorHandler errh;
XWindowAttributes wa;
gboolean is_pixmap;
errh = XSetErrorHandler (handle_x_error);
x_error = FALSE;
XGetWindowAttributes (gdk_pixbuf_dpy, d, &wa);
XSync (gdk_pixbuf_dpy, False);
is_pixmap = x_error;
XSetErrorHandler (errh);
return is_pixmap;
}
/*
convert 1 bits-pixel data
no alpha
*/
static void
rgb1 (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *s;
register guint8 data;
guint8 *o;
guint8 *srow = image->data, *orow = pixels;
d (printf ("1 bits/pixel\n"));
/* convert upto 8 pixels/time */
/* its probably not worth trying to make this run very fast, who uses
1 bit displays anymore? */
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx ++) {
data = srow[xx >> 3] >> (7 - (xx & 7)) & 1;
*o++ = colormap->colors[data].red;
*o++ = colormap->colors[data].green;
*o++ = colormap->colors[data].blue;
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 1 bits/pixel data
with alpha
*/
static void
rgb1a (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *s;
register guint8 data;
guint8 *o;
guint8 *srow = image->data, *orow = pixels;
guint32 remap[2];
d (printf ("1 bits/pixel\n"));
/* convert upto 8 pixels/time */
/* its probably not worth trying to make this run very fast, who uses
1 bit displays anymore? */
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (xx = 0; xx < 2; xx++) {
#ifdef LITTLE
remap[xx] = 0xff000000
| colormap->colors[xx].blue << 16
| colormap->colors[xx].green << 8
| colormap->colors[xx].red;
#else
remap[xx] = 0xff
| colormap->colors[xx].red << 24
| colormap->colors[xx].green << 16
| colormap->colors[xx].blue << 8;
#endif
}
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx ++) {
data = srow[xx >> 3] >> (7 - (xx & 7)) & 1;
*o++ = remap[data];
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 8 bits/pixel data
no alpha
*/
static void
rgb8 (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint32 mask;
register guint32 data;
guint8 *srow = image->data, *orow = pixels;
register guint8 *s;
register guint8 *o;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
d (printf ("8 bit, no alpha output\n"));
mask = mask_table[image->depth];
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx++) {
data = *s++ & mask;
*o++ = colormap->colors[data].red;
*o++ = colormap->colors[data].green;
*o++ = colormap->colors[data].blue;
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 8 bits/pixel data
with alpha
*/
static void
rgb8a (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint32 mask;
register guint32 data;
guint32 remap[256];
register guint8 *s; /* read 2 pixels at once */
register guint32 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
d (printf ("8 bit, with alpha output\n"));
mask = mask_table[image->depth];
for (xx = 0; xx < colormap->size; xx++) {
#ifdef LITTLE
remap[xx] = 0xff000000
| colormap->colors[xx].blue << 16
| colormap->colors[xx].green << 8
| colormap->colors[xx].red;
#else
remap[xx] = 0xff
| colormap->colors[xx].red << 24
| colormap->colors[xx].green << 16
| colormap->colors[xx].blue << 8;
#endif
}
for (yy = 0; yy < height; yy++) {
s = srow;
o = (guint32 *) orow;
for (xx = 0; xx < width; xx ++) {
data = *s++ & mask;
*o++ = remap[data];
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 16 bits/pixel data
no alpha
data in lsb format
*/
static void
rgb565lsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint32 *s; /* read 2 pixels at once */
#else
register guint8 *s; /* read 2 pixels at once */
#endif
register guint16 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint32 *) srow;
#else
s = srow;
#endif
o = (guint16 *) orow;
for (xx = 1; xx < width; xx += 2) {
register guint32 data;
#ifdef LITTLE
data = *s++;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21;
*o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
/* swap endianness first */
data = s[1] | s[0] << 8 | s[3] << 16 | s[2] << 24;
s += 4;
*o++ = (data & 0xf800) | (data & 0xe000) >> 5
| (data & 0x7e0) >> 3 | (data & 0x600) >> 9;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29;
*o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
if (width & 1) {
register guint16 data;
#ifdef LITTLE
data = *((short *) s);
#else
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#endif
((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7);
((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3);
((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7);
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 16 bits/pixel data
no alpha
data in msb format
*/
static void
rgb565msb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint8 *s; /* need to swap data order */
#else
register guint32 *s; /* read 2 pixels at once */
#endif
register guint16 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = srow;
#else
s = (guint32 *) srow;
#endif
o = (guint16 *) orow;
for (xx = 1; xx < width; xx += 2) {
register guint32 data;
#ifdef LITTLE
/* swap endianness first */
data = s[1] | s[0] << 8 | s[3] << 16 | s[2] << 24;
s += 4;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21;
*o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
data = *s++;
*o++ = (data & 0xf800) | (data & 0xe000) >> 5
| (data & 0x7e0) >> 3 | (data & 0x600) >> 9;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29;
*o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
if (width & 1) {
register guint16 data;
#ifdef LITTLE
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#else
data = *((short *) s);
#endif
((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7);
((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3);
((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7);
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 16 bits/pixel data
with alpha
data in lsb format
*/
static void
rgb565alsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = (guint8 *) srow;
#endif
o = (guint32 *) orow;
for (xx = 0; xx < width; xx ++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrrRRR ggggggGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB ggggggGG rrrrrRRR */
#ifdef LITTLE
data = *s++;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11
| (data & 0x7e0) << 13 | (data & 0x600) << 7
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 16 bits/pixel data
with alpha
data in msb format
*/
static void
rgb565amsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint8 *s;
#else
register guint16 *s; /* read 1 pixels at once */
#endif
register guint32 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = srow;
#else
s = (guint16 *) srow;
#endif
o = (guint32 *) orow;
for (xx = 0; xx < width; xx ++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggg00 bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggg00 rrrrrRRR */
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
data = *s++;
*o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11
| (data & 0x7e0) << 13 | (data & 0x600) << 7
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 15 bits/pixel data
no alpha
data in lsb format
*/
static void
rgb555lsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint32 *s; /* read 2 pixels at once */
#else
register guint8 *s; /* read 2 pixels at once */
#endif
register guint16 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint32 *) srow;
#else
s = srow;
#endif
o = (guint16 *) orow;
for (xx = 1; xx < width; xx += 2) {
register guint32 data;
#ifdef LITTLE
data = *s++;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20;
*o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
/* swap endianness first */
data = s[1] | s[0] << 8 | s[3] << 16 | s[2] << 24;
s += 4;
*o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4
| (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28;
*o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
if (width & 1) {
register guint16 data;
#ifdef LITTLE
data = *((short *) s);
#else
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#endif
((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12;
((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2;
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 15 bits/pixel data
no alpha
data in msb format
*/
static void
rgb555msb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint8 *s; /* read 2 pixels at once */
#else
register guint32 *s; /* read 2 pixels at once */
#endif
register guint16 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = srow;
#else
s = (guint32 *) srow;
#endif
o = (guint16 *) orow;
for (xx = 1; xx < width; xx += 2) {
register guint32 data;
#ifdef LITTLE
/* swap endianness first */
data = s[1] | s[0] << 8 | s[3] << 16 | s[2] << 24;
s += 4;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20;
*o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
data = *s++;
*o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4
| (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28;
*o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
if (width & 1) {
register guint16 data;
#ifdef LITTLE
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#else
data = *((short *) s);
#endif
((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12;
((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2;
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 15 bits/pixel data
with alpha
data in lsb format
*/
static void
rgb555alsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = srow;
#endif
o = (guint32 *) orow;
for (xx = 0; xx < width; xx++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */
#ifdef LITTLE
data = *s++;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12
| (data & 0x3e0) << 14 | (data & 0x380) << 9
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
orow += rowstride;
}
}
/*
convert 15 bits/pixel data
with alpha
data in msb format
*/
static void
rgb555amsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = srow;
#endif
o = (guint32 *) orow;
for (xx = 0; xx < width; xx++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
data = *s++;
*o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12
| (data & 0x3e0) << 14 | (data & 0x380) << 9
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888alsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *s; /* for byte order swapping */
guint8 *o;
guint8 *srow = image->data, *orow = pixels;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
d (printf ("32 bits/pixel with alpha\n"));
/* lsb data */
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx++) {
*o++ = s[2];
*o++ = s[1];
*o++ = s[0];
*o++ = 0xff;
s += 4;
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888lsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *srow = image->data, *orow = pixels;
guint8 *o, *s;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
d (printf ("32 bit, lsb, no alpha\n"));
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx++) {
*o++ = s[2];
*o++ = s[1];
*o++ = s[0];
s += 4;
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888amsb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *srow = image->data, *orow = pixels;
#ifdef LITTLE
guint32 *o;
guint32 *s;
#else
guint8 *s; /* for byte order swapping */
guint8 *o;
#endif
d (printf ("32 bit, msb, with alpha\n"));
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
/* msb data */
for (yy = 0; yy < height; yy++) {
#ifdef LITTLE
s = (guint32 *) srow;
o = (guint32 *) orow;
#else
s = srow;
o = orow;
#endif
for (xx = 0; xx < width; xx++) {
#ifdef LITTLE
*o++ = s[1];
*o++ = s[2];
*o++ = s[3];
*o++ = 0xff;
s += 4;
#else
*o++ = (*s << 8) | 0xff; /* untested */
s++;
#endif
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888msb (XImage *image, guchar *pixels, int rowstride, xlib_colormap *colormap)
{
int xx, yy;
int width, height;
int bpl;
guint8 *srow = image->data, *orow = pixels;
guint8 *s;
guint8 *o;
d (printf ("32 bit, msb, no alpha\n"));
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx++) {
*o++ = s[1];
*o++ = s[2];
*o++ = s[3];
s += 4;
}
srow += bpl;
orow += rowstride;
}
}
/*
This should work correctly with any display/any endianness, but will probably
run quite slow
*/
static void
convert_real_slow (XImage *image, guchar *pixels, int rowstride, xlib_colormap *cmap, int alpha)
{
int xx, yy;
int width, height;
int bpl;
guint8 *srow = image->data, *orow = pixels;
guint8 *s;
guint8 *o;
guint32 pixel;
Visual *v;
guint8 component;
int i;
int red_shift, red_prec, green_shift, green_prec, blue_shift, blue_prec;
width = image->width;
height = image->height;
bpl = image->bytes_per_line;
v = cmap->visual;
visual_decompose_mask (v->red_mask, &red_shift, &red_prec);
visual_decompose_mask (v->green_mask, &green_shift, &green_prec);
visual_decompose_mask (v->blue_mask, &blue_shift, &blue_prec);
d(printf("rgb mask/shift/prec = %x:%x:%x %d:%d:%d %d:%d:%d\n",
v->red_mask, v->green_mask, v->blue_mask,
red_shift, green_shift, blue_shift,
red_prec, green_prec, blue_prec));
for (yy = 0; yy < height; yy++) {
s = srow;
o = orow;
for (xx = 0; xx < width; xx++) {
pixel = XGetPixel (image, xx, yy);
switch (v->class) {
/* I assume this is right for static & greyscale's too? */
case StaticGray:
case GrayScale:
case StaticColor:
case PseudoColor:
*o++ = cmap->colors[pixel].red;
*o++ = cmap->colors[pixel].green;
*o++ = cmap->colors[pixel].blue;
break;
case TrueColor:
/* This is odd because it must sometimes shift left (otherwise
I'd just shift >> (*_shift - 8 + *_prec + <0-7>). This logic
should work for all bit sizes/shifts/etc. */
component = 0;
for (i = 24; i < 32; i += red_prec)
component |= ((pixel & v->red_mask) << (32 - red_shift - red_prec)) >> i;
*o++ = component;
component = 0;
for (i = 24; i < 32; i += green_prec)
component |= ((pixel & v->green_mask) << (32 - green_shift - green_prec)) >> i;
*o++ = component;
component = 0;
for (i = 24; i < 32; i += blue_prec)
component |= ((pixel & v->blue_mask) << (32 - blue_shift - blue_prec)) >> i;
*o++ = component;
break;
case DirectColor:
*o++ = cmap->colors[((pixel & v->red_mask) << (32 - red_shift - red_prec)) >> 24].red;
*o++ = cmap->colors[((pixel & v->green_mask) << (32 - green_shift - green_prec)) >> 24].green;
*o++ = cmap->colors[((pixel & v->blue_mask) << (32 - blue_shift - blue_prec)) >> 24].blue;
break;
}
if (alpha)
*o++ = 0xff;
}
srow += bpl;
orow += rowstride;
}
}
typedef void (* cfunc) (XImage *image, guchar *pixels, int rowstride, xlib_colormap *cmap);
static cfunc convert_map[] = {
rgb1,rgb1,rgb1a,rgb1a,
rgb8,rgb8,rgb8a,rgb8a,
rgb555lsb,rgb555msb,rgb555alsb,rgb555amsb,
rgb565lsb,rgb565msb,rgb565alsb,rgb565amsb,
rgb888lsb,rgb888msb,rgb888alsb,rgb888amsb
};
/*
perform actual conversion
If we can, try and use the optimised code versions, but as a default
fallback, and always for direct colour, use the generic/slow but complete
conversion function.
*/
static void
rgbconvert (XImage *image, guchar *pixels, int rowstride, int alpha, xlib_colormap *cmap)
{
int index = (image->byte_order == MSBFirst) | (alpha != 0) << 1;
int bank=5; /* default fallback converter */
Visual *v = cmap->visual;
d(printf("masks = %x:%x:%x\n", v->red_mask, v->green_mask, v->blue_mask));
d(printf("image depth = %d, bpp = %d\n", image->depth, image->bits_per_pixel));
switch (v->class) {
/* I assume this is right for static & greyscale's too? */
case StaticGray:
case GrayScale:
case StaticColor:
case PseudoColor:
switch (image->bits_per_pixel) {
case 1:
bank = 0;
break;
case 8:
bank = 1;
break;
}
break;
case TrueColor:
switch (image->depth) {
case 15:
if (v->red_mask == 0x7c00 && v->green_mask == 0x3e0 && v->blue_mask == 0x1f
&& image->bits_per_pixel == 16)
bank = 2;
break;
case 16:
if (v->red_mask == 0xf800 && v->green_mask == 0x7e0 && v->blue_mask == 0x1f
&& image->bits_per_pixel == 16)
bank = 3;
break;
case 24:
case 32:
if (v->red_mask == 0xff0000 && v->green_mask == 0xff00 && v->blue_mask == 0xff
&& image->bits_per_pixel == 32)
bank = 4;
break;
}
break;
case DirectColor:
/* always use the slow version */
break;
}
d(printf("converting using conversion function in bank %d\n", bank));
if (bank==5) {
convert_real_slow(image, pixels, rowstride, cmap, alpha);
} else {
index |= bank << 2;
(* convert_map[index]) (image, pixels, rowstride, cmap);
}
}
static gboolean
xlib_window_is_viewable (Window w)
{
XWindowAttributes wa;
while (w != 0) {
Window parent, root, *children;
int nchildren;
XGetWindowAttributes (gdk_pixbuf_dpy, w, &wa);
if (wa.map_state != IsViewable)
return FALSE;
if (!XQueryTree (gdk_pixbuf_dpy, w, &root,
&parent, &children, &nchildren))
return FALSE;
if (nchildren > 0)
XFree (children);
if ((parent == root) || (w == root))
return TRUE;
w = parent;
}
return FALSE;
}
static gint
xlib_window_get_origin (Window w, gint *x, gint *y)
{
Window child;
return XTranslateCoordinates (gdk_pixbuf_dpy, w,
RootWindow (gdk_pixbuf_dpy,
gdk_pixbuf_screen),
0, 0, x, y, &child);
}
/* Exported functions */
/**
* gdk_pixbuf_xlib_get_from_drawable:
* @dest: Destination pixbuf, or NULL if a new pixbuf should be created.
* @src: Source drawable.
* @cmap: A colormap if @src is a pixmap. If it is a window, this argument will
* be ignored.
* @visual: A visual if @src is a pixmap. If it is a window, this argument will
* be ignored.
* @src_x: Source X coordinate within drawable.
* @src_y: Source Y coordinate within drawable.
* @dest_x: Destination X coordinate in pixbuf, or 0 if @dest is NULL.
* @dest_y: Destination Y coordinate in pixbuf, or 0 if @dest is NULL.
* @width: Width in pixels of region to get.
* @height: Height in pixels of region to get.
*
* Transfers image data from a Gdk drawable and converts it to an RGB(A)
* representation inside a GdkPixbuf.
*
* If the drawable @src is a pixmap, then a suitable colormap must be specified,
* since pixmaps are just blocks of pixel data without an associated colormap.
* If the drawable is a window, the @cmap argument will be ignored and the
* window's own colormap will be used instead.
*
* If the specified destination pixbuf @dest is #NULL, then this function will
* create an RGB pixbuf with 8 bits per channel and no alpha, with the same size
* specified by the @width and @height arguments. In this case, the @dest_x and
* @dest_y arguments must be specified as 0, otherwise the function will return
* #NULL. If the specified destination pixbuf is not NULL and it contains alpha
* information, then the filled pixels will be set to full opacity.
*
* If the specified drawable is a pixmap, then the requested source rectangle
* must be completely contained within the pixmap, otherwise the function will
* return #NULL.
*
* If the specified drawable is a window, then it must be viewable, i.e. all of
* its ancestors up to the root window must be mapped. Also, the specified
* source rectangle must be completely contained within the window and within
* the screen. If regions of the window are obscured by noninferior windows, the
* contents of those regions are undefined. The contents of regions obscured by
* inferior windows of a different depth than that of the source window will also
* be undefined.
*
* Return value: The same pixbuf as @dest if it was non-NULL, or a newly-created
* pixbuf with a reference count of 1 if no destination pixbuf was specified; in
* the latter case, NULL will be returned if not enough memory could be
* allocated for the pixbuf to be created.
**/
GdkPixbuf *
gdk_pixbuf_xlib_get_from_drawable (GdkPixbuf *dest,
Drawable src,
Colormap cmap, Visual *visual,
int src_x, int src_y,
int dest_x, int dest_y,
int width, int height)
{
int src_width, src_height;
XImage *image;
int rowstride, bpp, alpha;
XWindowAttributes wa;
xlib_colormap *x_cmap;
gboolean is_pixmap;
/* General sanity checks */
g_return_val_if_fail (src != 0, NULL);
is_pixmap = drawable_is_pixmap (src);
if (is_pixmap) {
g_return_val_if_fail (cmap != 0, NULL);
g_return_val_if_fail (visual != NULL, NULL);
}
else
g_return_val_if_fail (xlib_window_is_viewable (src), NULL);
if (!dest)
g_return_val_if_fail (dest_x == 0 && dest_y == 0, NULL);
else {
g_return_val_if_fail (dest->colorspace == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail (dest->n_channels == 3
|| dest->n_channels == 4, NULL);
g_return_val_if_fail (dest->bits_per_sample == 8, NULL);
}
/* Coordinate sanity checks */
if (!is_pixmap) {
XGetWindowAttributes (gdk_pixbuf_dpy, src, &wa);
src_width = wa.width;
src_height = wa.height;
} else {
Window root;
int tx, ty, bwidth, depth;
XGetGeometry (gdk_pixbuf_dpy, src, &root, &tx, &ty,
&src_width, &src_height, &bwidth, &depth);
}
g_return_val_if_fail (src_x >= 0 && src_y >= 0, NULL);
g_return_val_if_fail (src_x + width <= src_width
&& src_y + height <= src_height, NULL);
if (dest) {
g_return_val_if_fail (dest_x >= 0 && dest_y >= 0, NULL);
g_return_val_if_fail (dest_x + width <= dest->width, NULL);
g_return_val_if_fail (dest_y + height <= dest->height, NULL);
}
if (!is_pixmap) {
int ret;
int src_xorigin, src_yorigin;
int screen_width, screen_height;
int screen_srcx, screen_srcy;
ret = xlib_window_get_origin (src, &src_xorigin, &src_yorigin);
g_return_val_if_fail (ret != FALSE, NULL);
screen_width = DisplayWidth (gdk_pixbuf_dpy, gdk_pixbuf_screen);
screen_height = DisplayHeight (gdk_pixbuf_dpy, gdk_pixbuf_screen);
screen_srcx = src_xorigin + src_x;
screen_srcy = src_yorigin + src_y;
g_return_val_if_fail (screen_srcx >= 0 && screen_srcy >= 0, NULL);
g_return_val_if_fail (screen_srcx + width <= screen_width, NULL);
g_return_val_if_fail (screen_srcy + height <= screen_height, NULL);
}
/* Get Image in ZPixmap format (packed bits). */
image = XGetImage (gdk_pixbuf_dpy, src, src_x, src_y,
width, height, AllPlanes, ZPixmap);
g_return_val_if_fail (image != NULL, NULL);
/* Create the pixbuf if needed */
if (!dest) {
dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
FALSE, 8, width, height);
if (!dest) {
XDestroyImage (image);
return NULL;
}
}
/* Get the colormap if needed */
if (!is_pixmap)
{
cmap = wa.colormap;
visual = wa.visual;
}
x_cmap = xlib_get_colormap (cmap, visual);
alpha = dest->has_alpha;
rowstride = dest->rowstride;
bpp = alpha ? 4 : 3;
/* we offset into the image data based on the position we are retrieving from */
rgbconvert (image, dest->pixels +
(dest_y * rowstride) + (dest_x * bpp),
rowstride,
alpha,
x_cmap);
xlib_colormap_free (x_cmap);
XDestroyImage (image);
return dest;
}
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