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gtk2/gdk/gdkpixbuf-drawable.c
Owen Taylor d12c9702a4 Private function to tell if we have RENDER extension. 
Thu Jan  3 22:18:15 2002  Owen Taylor  <otaylor@redhat.com>

	* gdk/x11/gdkdrawable-x11.c gdk/x11/gdkprivate-x11.h
	(_gdk_x11_have_render): Private function to tell if we have RENDER
	extension.

	* gdk/x11/gdkgc-x11.c (_gdk_x11_gc_get_fg_picture): Return
	None if we don't have RENDER extension.

	* gdk/x11/gdkpango-x11.c (gdk_pango_context_get): Don't
	use Xft unless we have render extension.

	* gdk/x11/gdkdrawable-x11.c (gdk_x11_drawable_get_picture):
	Handle missing render extension.

	* gdk/gdkdraw.c gdk/gdkdrawable.h gdk/gdkpixmap.c gdk/gdkwindow.c
	gdk/gdkinternals.h: Add a private copy_to_image() virtual function
	to the GdkDrawable vtable that extends get_image() to allow
	copying onto existing images.  Make the default implementation of
	get_image() use this so that backends don't have to implement
	both. Add private wrapper _gdk_drawable_copy_to_image().

	* gdk/x11/gdkimage-x11.c gdk/x11/gdkprivate-x11.c
	gdk/x11/gdkdrawable-x11.c (_gdk_x11_copy_to_image): Implement
	copy_to_image() semantics, speed up by using ShmPixmaps and
	XCopyArea when possible, XFlush() after ungrabbing the server,
	generally redo the logic once again.

	* gdk/gdkinternals.h gdk/x11/gdkimage-x11.c
	_gdk_windowing_bits_per_depth(): Function to convert from depth to
	bits-per-pixel. (We assume only one bpp per depth - X requires
	this.)

	* gdk/gdkinternals.h gdk/gdkrgb.c gdk/gdkimage.c: Move the GdkRGB
	scratch image code into a generic _gdk_image_get_scratch() chunk
	of code that we can use other places we need scratch images.

	* gdk/gdkimage.c gdk/x11/gdkimage.c gdk/gdkinternals.h:
	Add _gdk_image_new_for_depth() as the backend
	to _gdk_image_new() to allowing creating images with
	a depth and no visual.

	* gdk/gdkpixbuf-drawable.c: Fix so that getting
	parts of images not at 0,0 actually works.

	* gdk/gdkdrawable.h gdk/gdkinternals.h gdk/gdkdraw.c
	gdk/gdkwindow.c gdk/gdkpixmap.c gdk/gdkpixbuf-render.c:
	 - Add a new GdkDrawableClass vfunc _draw_pixbuf, and
	  _gdk_draw_pixbuf() [ will be made public later ], to allow
	  backends to accelerate drawing pixbufs.
	 - Move the implementation of gdk_pixbuf_render_to_drawable_alpha()
	   to be the default implementation.
	 - Update docs for gdk_pixbuf_render_to_drawable_alpha().
	 - Optimize the default implementation by using
	   _gdk_image_copy_to_pixmap() and scratch shared images, and
	   special casing the compositing.

	* gdk/x11/gdkdrawable-x11.c: Accelerate _gdk_draw_pixbuf()
	with alpha using the RENDER extension.

        * gdk/gdkpixbuf-drawable.c (gdk_pixbuf_get_from_drawable):
	Optimize by _gdk_image_copy_to_pixmap() and scratch images.

	* tests/testrgb.c: Add test for speed of alpha composition,
	reduce the number of iterations since alpha composition
	can be a bit slow.

	* gdk/x11/gdkimage-x11.c gdk/gdkprivate-x11.h (_gdk_x11_image_get_shm_pixmap):
	Private function to get a ShmPixmap for an image, if possible.
2002-01-04 05:58:01 +00:00

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/* 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 Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include "gdk.h" /* For gdk_screen_width/gdk_screen_height */
#include "gdkcolor.h"
#include "gdkimage.h"
#include "gdkvisual.h"
#include "gdkwindow.h"
#include "gdkpixbuf.h"
#include "gdk-pixbuf-private.h"
#include "gdkinternals.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
};
/*
* convert bitmap data to pixbuf without alpha,
* without using a colormap
*/
static void
bitmap1 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2)
{
int xx, yy;
int bpl;
register guint8 data;
guint8 *o;
guint8 *srow = image->mem + y1 * image->bpl, *orow = pixels;
d (printf ("bitmap, no alpha\n"));
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
o = orow;
for (xx = x1; xx < x2; xx ++)
{
/* top 29 bits of xx (xx >> 3) indicate the byte the bit is inside,
* bottom 3 bits (xx & 7) indicate bit inside that byte,
* we don't bother to canonicalize data to 1 or 0, just
* leave the relevant bit in-place.
*/
data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
(0x80 >> (xx & 7)) :
(1 << (xx & 7)));
if (data)
{
*o++ = 255;
*o++ = 255;
*o++ = 255;
}
else
{
*o++ = 0;
*o++ = 0;
*o++ = 0;
}
}
srow += bpl;
orow += rowstride;
}
}
/*
* convert bitmap data to pixbuf with alpha,
* without using a colormap
*/
static void
bitmap1a (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2)
{
int xx, yy;
int bpl;
register guint8 data;
guint8 *o;
guint8 *srow = image->mem + y1 * image->bpl, *orow = pixels;
d (printf ("bitmap, with alpha\n"));
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
o = orow;
for (xx = x1; xx < x2; xx ++)
{
/* see comment in bitmap1() */
data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
(0x80 >> (xx & 7)) :
(1 << (xx & 7)));
if (data)
{
*o++ = 255;
*o++ = 255;
*o++ = 255;
*o++ = 255;
}
else
{
*o++ = 0;
*o++ = 0;
*o++ = 0;
*o++ = 0;
}
}
srow += bpl;
orow += rowstride;
}
}
/*
* convert 1 bits-pixel data
* no alpha
*/
static void
rgb1 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
register guint8 data;
guint8 *o;
guint8 *srow = image->mem + y1 * image->bpl, *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?
*/
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
o = orow;
for (xx = x1; xx < x2; xx ++)
{
/* see comment in bitmap1() */
data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
(0x80 >> (xx & 7)) :
(1 << (xx & 7)));
*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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
register guint8 data;
guint8 *o;
guint8 *srow = image->mem + y1 * image->bpl, *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? */
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
o = orow;
for (xx = x1; xx < x2; xx ++)
{
/* see comment in bitmap1() */
data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
(0x80 >> (xx & 7)) :
(1 << (xx & 7)));
*o++ = colormap->colors[data].red;
*o++ = colormap->colors[data].green;
*o++ = colormap->colors[data].blue;
*o++ = 255;
}
srow += bpl;
orow += rowstride;
}
}
/*
* convert 8 bits/pixel data
* no alpha
*/
static void
rgb8 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint32 mask;
register guint32 data;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
register guint8 *s;
register guint8 *o;
bpl = image->bpl;
d (printf ("8 bit, no alpha output\n"));
mask = mask_table[image->depth];
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint32 mask;
register guint32 data;
guint32 remap[256];
register guint8 *s; /* read 2 pixels at once */
register guint32 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
d (printf ("8 bit, with alpha output\n"));
mask = mask_table[image->depth];
for (xx = x1; 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 = y1; yy < y2; yy++)
{
s = srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
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->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint32 *) srow;
#else
s = srow;
#endif
o = (guint16 *) orow;
/* check for first pixel odd */
xx = x1;
if (xx & 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);
((char *) o) += 3;
++xx;
}
g_assert (!(xx & 1));
/* if x2 is even, then the -1 does nothing to number of
* loop iterations, if x2 is odd then the -1 reduces
* iterations by one
*/
for (; xx < (x2 - 1); 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[0] | s[1] << 8 | s[2] << 16 | s[3] << 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 (x2 & 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
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->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = srow;
#else
s = (guint32 *) srow;
#endif
o = (guint16 *) orow;
xx = x1;
/* check for first pixel odd */
if (xx & 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);
((char *) o) += 3;
++xx;
}
g_assert (!(xx & 1));
/* if x2 is even, then the -1 does nothing to number of
* loop iterations, if x2 is odd then the -1 reduces
* iterations by one
*/
for (; xx < (x2 - 1); xx += 2)
{
register guint32 data;
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 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 (x2 & 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = (guint8 *) srow;
#endif
o = (guint32 *) orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
#ifdef LITTLE
register guint8 *s;
#else
register guint16 *s; /* read 1 pixels at once */
#endif
register guint32 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
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->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint32 *) srow;
#else
s = srow;
#endif
o = (guint16 *) orow;
xx = x1;
/* check for first odd pixel */
if (xx & 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;
((char *) o) += 3;
++xx;
}
g_assert (!(xx & 1));
/* if x2 is even, then the -1 does nothing to number of
* loop iterations, if x2 is odd then the -1 reduces
* iterations by one
*/
for (; xx < (x2 - 1); 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[0] | s[1] << 8 | s[2] << 16 | s[3] << 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 (x2 & 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
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->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = (guint16 *) orow;
xx = x1;
/* See if first pixel is odd */
if (xx & 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;
((char *) o) += 3;
++xx;
}
g_assert (!(xx & 1));
/* if x2 is even, then the -1 does nothing to number of
* loop iterations, if x2 is odd then the -1 reduces
* iterations by one
*/
for (; xx < (x2 - 1); xx += 2)
{
register guint32 data;
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 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 (x2 & 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = srow;
#endif
o = (guint32 *) orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
#ifdef LITTLE
register guint16 *s; /* read 1 pixels at once */
#else
register guint8 *s;
#endif
register guint32 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint16 *) srow;
#else
s = srow;
#endif
o = (guint32 *) orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint8 *s; /* for byte order swapping */
guint8 *o;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
d (printf ("32 bits/pixel with alpha\n"));
/* lsb data */
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = orow;
for (xx = x1; xx < x2; xx++)
{
*o++ = s[2];
*o++ = s[1];
*o++ = s[0];
*o++ = 0xff;
s += 4;
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888lsb (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
guint8 *o, *s;
bpl = image->bpl;
d (printf ("32 bit, lsb, no alpha\n"));
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = orow;
for (xx = x1; xx < x2; xx++)
{
*o++ = s[2];
*o++ = s[1];
*o++ = s[0];
s += 4;
}
srow += bpl;
orow += rowstride;
}
}
static void
rgb888amsb (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *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"));
bpl = image->bpl;
/* msb data */
for (yy = y1; yy < y2; yy++)
{
#ifdef LITTLE
s = (guint32 *) srow;
o = (guint32 *) orow;
#else
s = srow;
o = orow;
#endif
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *colormap)
{
int xx, yy;
int bpl;
guint8 *srow = image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
guint8 *s;
guint8 *o;
d (printf ("32 bit, msb, no alpha\n"));
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = srow;
o = orow;
for (xx = x1; xx < x2; 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 (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *cmap,
gboolean alpha)
{
int xx, yy;
int bpl;
guint8 *orow = pixels;
guint8 *o;
guint32 pixel;
GdkVisual *v;
guint8 component;
int i;
bpl = image->bpl;
v = gdk_colormap_get_visual(cmap);
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,
v->red_shift, v->green_shift, v->blue_shift,
v->red_prec, v->green_prec, v->blue_prec));
for (yy = y1; yy < y2; yy++)
{
o = orow;
for (xx = x1; xx < x2; xx++)
{
pixel = gdk_image_get_pixel(image, xx, yy);
switch (v->type)
{
/* I assume this is right for static & greyscale's too? */
case GDK_VISUAL_STATIC_GRAY:
case GDK_VISUAL_GRAYSCALE:
case GDK_VISUAL_STATIC_COLOR:
case GDK_VISUAL_PSEUDO_COLOR:
*o++ = cmap->colors[pixel].red;
*o++ = cmap->colors[pixel].green;
*o++ = cmap->colors[pixel].blue;
break;
case GDK_VISUAL_TRUE_COLOR:
/* 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 += v->red_prec)
component |= ((pixel & v->red_mask) << (32 - v->red_shift - v->red_prec)) >> i;
*o++ = component;
component = 0;
for (i = 24; i < 32; i += v->green_prec)
component |= ((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> i;
*o++ = component;
component = 0;
for (i = 24; i < 32; i += v->blue_prec)
component |= ((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> i;
*o++ = component;
break;
case GDK_VISUAL_DIRECT_COLOR:
*o++ = cmap->colors[((pixel & v->red_mask) << (32 - v->red_shift - v->red_prec)) >> 24].red;
*o++ = cmap->colors[((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> 24].green;
*o++ = cmap->colors[((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> 24].blue;
break;
}
if (alpha)
*o++ = 0xff;
}
orow += rowstride;
}
}
typedef void (* cfunc) (GdkImage *image,
guchar *pixels,
int rowstride,
int x1,
int y1,
int x2,
int y2,
GdkColormap *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 (GdkImage *image,
guchar *pixels,
int rowstride,
gboolean alpha,
int x,
int y,
int width,
int height,
GdkColormap *cmap)
{
int index;
int bank;
GdkVisual *v;
g_assert ((x + width) <= image->width);
g_assert ((y + height) <= image->height);
if (cmap == NULL)
{
/* Only allowed for bitmaps */
g_return_if_fail (image->depth == 1);
if (alpha)
bitmap1a (image, pixels, rowstride,
x, y, x + width, y + height);
else
bitmap1 (image, pixels, rowstride,
x, y, x + width, y + height);
return;
}
v = gdk_colormap_get_visual (cmap);
bank = 5; /* default fallback converter */
index = (image->byte_order == GDK_MSB_FIRST) | (alpha != 0) << 1;
d(printf("masks = %x:%x:%x\n", v->red_mask, v->green_mask, v->blue_mask));
d(printf("image depth = %d, bits per pixel = %d\n", image->depth, image->bits_per_pixel));
switch (v->type)
{
/* I assume this is right for static & greyscale's too? */
case GDK_VISUAL_STATIC_GRAY:
case GDK_VISUAL_GRAYSCALE:
case GDK_VISUAL_STATIC_COLOR:
case GDK_VISUAL_PSEUDO_COLOR:
switch (image->bits_per_pixel)
{
case 1:
bank = 0;
break;
case 8:
if (image->depth == 8)
bank = 1;
break;
}
break;
case GDK_VISUAL_TRUE_COLOR:
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 GDK_VISUAL_DIRECT_COLOR:
/* always use the slow version */
break;
}
d (g_print ("converting using conversion function in bank %d\n", bank));
if (bank == 5)
{
convert_real_slow (image, pixels, rowstride,
x, y, x + width, y + height,
cmap, alpha);
}
else
{
index |= bank << 2;
d (g_print ("converting with index %d\n", index));
(* convert_map[index]) (image, pixels, rowstride,
x, y, x + width, y + height,
cmap);
}
}
/* Exported functions */
/**
* gdk_pixbuf_get_from_drawable:
* @dest: Destination pixbuf, or %NULL if a new pixbuf should be created.
* @src: Source drawable.
* @cmap: A colormap if @src doesn't have one set.
* @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 #GdkDrawable and converts it to an RGB(A)
* representation inside a #GdkPixbuf. In other words, copies
* image data from a server-side drawable to a client-side RGB(A) buffer.
* This allows you to efficiently read individual pixels on the client side.
*
* If the drawable @src has no colormap (gdk_drawable_get_colormap()
* returns %NULL), then a suitable colormap must be specified.
* Typically a #GdkWindow or a pixmap created by passing a #GdkWindow
* to gdk_pixmap_new() will already have a colormap associated with
* it. If the drawable has a colormap, the @cmap argument will be
* ignored. If the drawable is a bitmap (1 bit per pixel pixmap),
* then a colormap is not required; pixels with a value of 1 are
* assumed to be white, and pixels with a value of 0 are assumed to be
* black. For taking screenshots, gdk_colormap_get_system() returns
* the correct colormap to use.
*
* 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. If the specified destination pixbuf is not %NULL
* and it contains alpha information, then the filled pixels will be
* set to full opacity (alpha = 255).
*
* 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. For pixmaps only (not for windows)
* passing -1 for width or height is allowed to mean the full width
* or height of the pixmap.
*
* If the specified drawable is a window, and the window is off the
* screen, then there is no image data in the obscured/offscreen
* regions to be placed in the pixbuf. The contents of portions of the
* pixbuf corresponding to the offscreen region are undefined.
*
* If the window you're obtaining data from is partially obscured by
* other windows, then the contents of the pixbuf areas corresponding
* to the obscured regions are undefined.
*
* If the target drawable is not mapped (typically because it's
* iconified/minimized or not on the current workspace), then %NULL
* will be returned.
*
* If memory can't be allocated for the return value, %NULL will be returned
* instead.
*
* (In short, there are several ways this function can fail, and if it fails
* it returns %NULL; so check the return value.)
*
* This function calls gdk_drawable_get_image() internally and
* converts the resulting image to a #GdkPixbuf, so the
* documentation for gdk_drawable_get_image() may also be relevant.
*
* 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, or %NULL on error
**/
GdkPixbuf *
gdk_pixbuf_get_from_drawable (GdkPixbuf *dest,
GdkDrawable *src,
GdkColormap *cmap,
int src_x, int src_y,
int dest_x, int dest_y,
int width, int height)
{
int src_width, src_height;
GdkImage *image;
int depth;
int x0, y0;
/* General sanity checks */
g_return_val_if_fail (src != NULL, NULL);
if (GDK_IS_WINDOW (src))
/* FIXME: this is not perfect, since is_viewable() only tests
* recursively up the Gdk parent window tree, but stops at
* foreign windows or Gdk toplevels. I.e. if a window manager
* unmapped one of its own windows, this won't work.
*/
g_return_val_if_fail (gdk_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);
}
/* Create the pixbuf if needed */
if (!dest)
{
dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
if (dest == NULL)
return NULL;
}
if (cmap == NULL)
cmap = gdk_drawable_get_colormap (src);
depth = gdk_drawable_get_depth (src);
if (depth != 1 && cmap == NULL)
{
g_warning ("%s: Source drawable has no colormap; either pass "
"in a colormap, or set the colormap on the drawable "
"with gdk_drawable_set_colormap()", G_STRLOC);
return NULL;
}
/* Coordinate sanity checks */
if (GDK_IS_PIXMAP (src))
{
gdk_drawable_get_size (src, &src_width, &src_height);
if (width < 0)
width = src_width;
if (height < 0)
height = src_height;
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);
}
for (y0 = 0; y0 < height; y0 += GDK_SCRATCH_IMAGE_HEIGHT)
{
gint height1 = MIN (height - y0, GDK_SCRATCH_IMAGE_HEIGHT);
for (x0 = 0; x0 < width; x0 += GDK_SCRATCH_IMAGE_WIDTH)
{
gint xs0, ys0;
gint width1 = MIN (width - x0, GDK_SCRATCH_IMAGE_WIDTH);
image = _gdk_image_get_scratch (width1, height1, depth, &xs0, &ys0);
_gdk_drawable_copy_to_image (src, image,
src_x + x0, src_y + y0,
xs0, ys0, width1, height1);
gdk_pixbuf_get_from_image (dest, image, cmap,
xs0, ys0, dest_x + x0, dest_y + y0,
width1, height1);
}
}
return dest;
}
/**
* gdk_pixbuf_get_from_image:
* @dest: Destination pixbuf, or %NULL if a new pixbuf should be created.
* @src: Source #GdkImage.
* @cmap: A colormap, or %NULL to use the one for @src
* @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.
*
* Same as gdk_pixbuf_get_from_drawable() but gets the pixbuf from
* an image.
*
* Return value: @dest, newly-created pixbuf if @dest was %NULL, %NULL on error
**/
GdkPixbuf*
gdk_pixbuf_get_from_image (GdkPixbuf *dest,
GdkImage *src,
GdkColormap *cmap,
int src_x,
int src_y,
int dest_x,
int dest_y,
int width,
int height)
{
int rowstride, bpp, alpha;
/* General sanity checks */
g_return_val_if_fail (GDK_IS_IMAGE (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);
}
if (cmap == NULL)
cmap = gdk_image_get_colormap (src);
if (src->depth != 1 && cmap == NULL)
{
g_warning ("%s: Source image has no colormap; either pass "
"in a colormap, or set the colormap on the image "
"with gdk_image_set_colormap()", G_STRLOC);
return NULL;
}
/* Coordinate sanity checks */
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);
}
/* Create the pixbuf if needed */
if (!dest)
{
dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
if (dest == NULL)
return NULL;
}
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 (src, dest->pixels +
(dest_y * rowstride) + (dest_x * bpp),
rowstride,
alpha,
src_x, src_y,
width,
height,
cmap);
return dest;
}
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