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84ebfb7efa
gtk/gdk/gdkpixbuf-drawable.c
Owen Taylor 84ebfb7efa #71597, reported by Morten Welinder 
Tue Jun  3 17:39:16 2003  Owen Taylor  <otaylor@redhat.com>

        #71597, reported by Morten Welinder

        * gdk/gdkpixbuf-drawable.c (rgb888amsb): Fix and simplify
        (Patch from Christian Petig)

        * gdk/gdkpixbuf-drawable.c (rgb{555,565}{a,}{msb,lsb}):
        Major rewrite of 555 and 565 conversion routines:

        - Move all the bit shifting into a small block of macros,
          eliminating much duplication of complicated arithmetic.
        - Get rid of 2-pixels at a time code, which was buggy,
          hard to maintain, caused unaligned accesses, and
          probably didn't actually perform any better.
        - Simplify cases where different data types were
          used for the little and big endian cases, use
          GUINT16_SWAP_LE_BE() where appropriate.
2003-06-03 22:09:11 +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 "gdkcolor.h"
#include "gdkimage.h"
#include "gdkvisual.h"
#include "gdkwindow.h"
#include "gdkpixbuf.h"
#include "gdkpixmap.h"
#include "gdk-pixbuf-private.h"
#include "gdkinternals.h"
/* Some convenient names
*/
#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
#define LITTLE
#undef BIG
#else
#define BIG
#undef LITTLE
#endif
#define d(x)
#define SWAP16(d) GUINT16_SWAP_LE_BE(d)
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 = (guint8*)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 = (guint8*)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 = (guint8*)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 >> 8;
*o++ = colormap->colors[data].green >> 8;
*o++ = colormap->colors[data].blue >> 8;
}
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 = (guint8*)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 >> 8;
*o++ = colormap->colors[data].green >> 8;
*o++ = colormap->colors[data].blue >> 8;
*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 = (guint8*)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 >> 8;
*o++ = colormap->colors[data].green >> 8;
*o++ = colormap->colors[data].blue >> 8;
}
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 = (guint8*)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 & 0xff00) << 8
| (colormap->colors[xx].green & 0xff00)
| (colormap->colors[xx].red >> 8);
#else
remap[xx] = 0xff
| (colormap->colors[xx].red & 0xff00) << 16
| (colormap->colors[xx].green & 0xff00) << 8
| (colormap->colors[xx].blue & 0xff00);
#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;
}
}
/* Bit shifting for 565 and 555 conversion routines
*
* RGB565 == rrrr rggg gggb bbbb, 16 bit native endian
* RGB555 == xrrr rrgg gggb bbbb
* ABGR8888: ARGB, 32-bit native endian
* RGBA8888: RGBA, 32-bit native endian
*/
#define R8fromRGB565(d) ((((d) >> 8) & 0xf8) | (((d) >> 13) & 0x7))
#define B8fromRGB565(d) ((((d) >> 3) & 0xfc) | (((d) >> 9) & 0x3))
#define G8fromRGB565(d) ((((d) << 3) & 0xf8) | (((d) >> 2) & 0x7))
#define ABGR8888fromRGB565(d) ( ((d) & 0xf800) >> 8 | ((d) & 0xe000) >> 13 \
| ((d) & 0x07e0) << 5 | ((d) & 0x0600) >> 1 \
| ((d) & 0x001f) << 19 | ((d) & 0x001c) << 14 \
| 0xff000000)
#define RGBA8888fromRGB565(d) ( ((d) & 0xf800) << 16 | ((d) & 0xe000) << 11 \
| ((d) & 0x07e0) << 13 | ((d) & 0x0600) << 7 \
| ((d) & 0x001f) << 11 | ((d) & 0x001c) << 6 \
| 0xff)
#define R8fromRGB555(d) (((d) & 0x7c00) >> 7 | ((d) & 0x7000) >> 12)
#define B8fromRGB555(d) (((d) & 0x03e0) >> 2 | ((d) & 0x0380) >> 7)
#define G8fromRGB555(d) (((d) & 0x001f) << 3 | ((d) & 0x001c) >> 2)
#define ABGR8888fromRGB555(d) ( ((d) & 0x7c00) >> 7 | ((d) & 0x7000) >> 12 \
| ((d) & 0x03e0) << 6 | ((d) & 0x0380) << 1 \
| ((d) & 0x001f) << 19 | ((d) & 0x001c) << 14 \
| 0xff000000)
#define RGBA8888fromRGB555(d) ( ((d) & 0x7c00) << 17 | ((d) & 0x7000) << 12 \
| ((d) & 0x03e0) << 14 | ((d) & 0x0380) << 9 \
| ((d) & 0x001f) << 11 | ((d) & 0x001c) << 6 \
| 0xff)
/*
* 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;
register guint16 *s;
register guint8 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint8 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef BIG
data = SWAP16 (data);
#endif
*o++ = R8fromRGB565 (data);
*o++ = G8fromRGB565 (data);
*o++ = B8fromRGB565 (data);
}
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;
register guint16 *s;
register guint8 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint8 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef LITTLE
data = SWAP16 (data);
#endif
*o++ = R8fromRGB565 (data);
*o++ = G8fromRGB565 (data);
*o++ = B8fromRGB565 (data);
}
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;
register guint16 *s;
register guint32 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef LITTLE
*o++ = ABGR8888fromRGB565 (data);
#else
data = SWAP16 (data);
*o++ = RGBA8888fromRGB565 (data);
#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;
register guint16 *s;
register guint32 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef LITTLE
data = SWAP16 (data);
*o++ = ABGR8888fromRGB565 (data);
#else
*o++ = RGBA8888fromRGB565 (data);
#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;
register guint16 *s;
register guint8 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint8 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef BIG
data = SWAP16 (data);
#endif
*o++ = R8fromRGB555 (data);
*o++ = G8fromRGB555 (data);
*o++ = B8fromRGB555 (data);
}
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;
register guint16 *s;
register guint8 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint8 *) orow;
for (xx = x1; xx < x2; xx ++)
{
register guint32 data = *s++;
#ifdef LITTLE
data = SWAP16 (data);
#endif
*o++ = R8fromRGB555 (data);
*o++ = G8fromRGB555 (data);
*o++ = B8fromRGB555 (data);
}
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;
register guint16 *s; /* read 1 pixels at once */
register guint32 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; xx++)
{
register guint32 data = *s++;
#ifdef LITTLE
*o++ = ABGR8888fromRGB555 (data);
#else
data = SWAP16 (data);
*o++ = RGBA8888fromRGB555 (data);
#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;
register guint16 *s;
register guint32 *o;
guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
bpl = image->bpl;
for (yy = y1; yy < y2; yy++)
{
s = (guint16 *) srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; xx++)
{
register guint32 data = *s++;
#ifdef LITTLE
data = SWAP16 (data);
*o++ = ABGR8888fromRGB555 (data);
#else
*o++ = RGBA8888fromRGB555 (data);
#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 = (guint8*)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 = (guint8*)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 = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
guint32 *o;
guint32 *s;
d (printf ("32 bit, msb, with alpha\n"));
bpl = image->bpl;
/* msb data */
for (yy = y1; yy < y2; yy++)
{
s = (guint32 *) srow;
o = (guint32 *) orow;
for (xx = x1; xx < x2; xx++)
{
#ifdef LITTLE
*o++ = (*s++ >> 8) | 0xff000000;
#else
*o++ = (*s++ << 8) | 0xff;
#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 = (guint8*)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);
if (image->depth != v->depth)
{
g_warning ("%s: The depth of the source image (%d) doesn't "
"match the depth of the colormap passed in (%d).",
G_STRLOC, image->depth, v->depth);
return;
}
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 >> 8;
*o++ = cmap->colors[pixel].green >> 8;
*o++ = cmap->colors[pixel].blue >> 8;
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 >> 8;
*o++ = cmap->colors[((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> 24].green >> 8;
*o++ = cmap->colors[((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> 24].blue >> 8;
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);
if (image->depth != v->depth)
{
g_warning ("%s: The depth of the source image (%d) doesn't "
"match the depth of the colormap passed in (%d).",
G_STRLOC, image->depth, v->depth);
return;
}
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);
}
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;
}
if (cmap != NULL && depth != cmap->visual->depth)
{
g_warning ("%s: Depth of the source drawable is %d where as "
"the visual depth of the colormap passed is %d",
G_STRLOC, depth, cmap->visual->depth);
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);
}
/* Create the pixbuf if needed */
if (!dest)
{
dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
if (dest == NULL)
return 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 (gdk_drawable_get_screen (src),
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;
}
if (cmap != NULL && src->depth != cmap->visual->depth)
{
g_warning ("%s: Depth of the Source image is %d where as "
"the visual depth of the colormap passed is %d",
G_STRLOC, src->depth, cmap->visual->depth);
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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