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4bd76958c2
2002-04-13 Havoc Pennington <hp@pobox.com> * gdk/gdkpixbuf-drawable.c (gdk_pixbuf_get_from_drawable): create the target pixbuf AFTER filling in width/height, so that passing in -1 for width/height will work.
1662 lines
42 KiB
C
1662 lines
42 KiB
C
/* GdkPixbuf library - convert X drawable information to RGB
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*
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* Copyright (C) 1999 Michael Zucchi
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*
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* Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
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* Cody Russell <bratsche@dfw.net>
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* Federico Mena-Quintero <federico@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <string.h>
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#include "gdk.h" /* For gdk_screen_width/gdk_screen_height */
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#include "gdkcolor.h"
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#include "gdkimage.h"
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#include "gdkvisual.h"
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#include "gdkwindow.h"
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#include "gdkpixbuf.h"
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#include "gdk-pixbuf-private.h"
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#include "gdkinternals.h"
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#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
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#define LITTLE
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#endif
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#define d(x)
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static guint32 mask_table[] = {
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0x00000000, 0x00000001, 0x00000003, 0x00000007,
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0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
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0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
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0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
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0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
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0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
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0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
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0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
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0xffffffff
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};
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/*
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* convert bitmap data to pixbuf without alpha,
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* without using a colormap
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*/
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static void
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bitmap1 (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2)
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{
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int xx, yy;
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int bpl;
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register guint8 data;
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guint8 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels;
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d (printf ("bitmap, no alpha\n"));
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bpl = image->bpl;
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for (yy = y1; yy < y2; yy++)
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{
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o = orow;
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for (xx = x1; xx < x2; xx ++)
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{
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/* top 29 bits of xx (xx >> 3) indicate the byte the bit is inside,
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* bottom 3 bits (xx & 7) indicate bit inside that byte,
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* we don't bother to canonicalize data to 1 or 0, just
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* leave the relevant bit in-place.
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*/
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data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
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(0x80 >> (xx & 7)) :
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(1 << (xx & 7)));
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if (data)
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{
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*o++ = 255;
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*o++ = 255;
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*o++ = 255;
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}
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else
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{
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*o++ = 0;
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*o++ = 0;
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*o++ = 0;
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}
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert bitmap data to pixbuf with alpha,
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* without using a colormap
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*/
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static void
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bitmap1a (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2)
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{
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int xx, yy;
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int bpl;
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register guint8 data;
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guint8 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels;
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d (printf ("bitmap, with alpha\n"));
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bpl = image->bpl;
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for (yy = y1; yy < y2; yy++)
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{
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o = orow;
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for (xx = x1; xx < x2; xx ++)
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{
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/* see comment in bitmap1() */
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data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
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(0x80 >> (xx & 7)) :
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(1 << (xx & 7)));
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if (data)
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{
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*o++ = 255;
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*o++ = 255;
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*o++ = 255;
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*o++ = 255;
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}
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else
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{
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*o++ = 0;
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*o++ = 0;
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*o++ = 0;
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*o++ = 0;
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}
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert 1 bits-pixel data
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* no alpha
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*/
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static void
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rgb1 (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2,
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GdkColormap *colormap)
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{
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int xx, yy;
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int bpl;
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register guint8 data;
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guint8 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels;
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d (printf ("1 bits/pixel\n"));
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/* convert upto 8 pixels/time */
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/* its probably not worth trying to make this run very fast, who uses
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* 1 bit displays anymore?
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*/
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bpl = image->bpl;
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for (yy = y1; yy < y2; yy++)
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{
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o = orow;
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for (xx = x1; xx < x2; xx ++)
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{
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/* see comment in bitmap1() */
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data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
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(0x80 >> (xx & 7)) :
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(1 << (xx & 7)));
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*o++ = colormap->colors[data].red;
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*o++ = colormap->colors[data].green;
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*o++ = colormap->colors[data].blue;
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert 1 bits/pixel data
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* with alpha
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*/
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static void
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rgb1a (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2,
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GdkColormap *colormap)
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{
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int xx, yy;
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int bpl;
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register guint8 data;
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guint8 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels;
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d (printf ("1 bits/pixel\n"));
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/* convert upto 8 pixels/time */
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/* its probably not worth trying to make this run very fast, who uses
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* 1 bit displays anymore? */
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bpl = image->bpl;
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for (yy = y1; yy < y2; yy++)
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{
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o = orow;
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for (xx = x1; xx < x2; xx ++)
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{
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/* see comment in bitmap1() */
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data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ?
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(0x80 >> (xx & 7)) :
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(1 << (xx & 7)));
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*o++ = colormap->colors[data].red;
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*o++ = colormap->colors[data].green;
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*o++ = colormap->colors[data].blue;
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*o++ = 255;
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert 8 bits/pixel data
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* no alpha
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*/
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static void
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rgb8 (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2,
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GdkColormap *colormap)
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{
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int xx, yy;
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int bpl;
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guint32 mask;
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register guint32 data;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
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register guint8 *s;
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register guint8 *o;
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bpl = image->bpl;
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d (printf ("8 bit, no alpha output\n"));
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mask = mask_table[image->depth];
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for (yy = y1; yy < y2; yy++)
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{
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s = srow;
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o = orow;
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for (xx = x1; xx < x2; xx++)
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{
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data = *s++ & mask;
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*o++ = colormap->colors[data].red;
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*o++ = colormap->colors[data].green;
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*o++ = colormap->colors[data].blue;
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert 8 bits/pixel data
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* with alpha
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*/
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static void
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rgb8a (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2,
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GdkColormap *colormap)
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{
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int xx, yy;
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int bpl;
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guint32 mask;
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register guint32 data;
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guint32 remap[256];
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register guint8 *s; /* read 2 pixels at once */
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register guint32 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
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bpl = image->bpl;
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d (printf ("8 bit, with alpha output\n"));
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mask = mask_table[image->depth];
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for (xx = x1; xx < colormap->size; xx++)
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{
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#ifdef LITTLE
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remap[xx] = 0xff000000
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| colormap->colors[xx].blue << 16
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| colormap->colors[xx].green << 8
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| colormap->colors[xx].red;
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#else
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remap[xx] = 0xff
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| colormap->colors[xx].red << 24
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| colormap->colors[xx].green << 16
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| colormap->colors[xx].blue << 8;
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#endif
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}
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for (yy = y1; yy < y2; yy++)
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{
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s = srow;
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o = (guint32 *) orow;
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for (xx = x1; xx < x2; xx ++)
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{
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data = *s++ & mask;
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*o++ = remap[data];
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}
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srow += bpl;
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orow += rowstride;
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}
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}
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/*
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* convert 16 bits/pixel data
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* no alpha
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* data in lsb format
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*/
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static void
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rgb565lsb (GdkImage *image,
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guchar *pixels,
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int rowstride,
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int x1,
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int y1,
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int x2,
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int y2,
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GdkColormap *colormap)
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{
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int xx, yy;
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int bpl;
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#ifdef LITTLE
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register guint32 *s; /* read 2 pixels at once */
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#else
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register guint8 *s; /* read 2 pixels at once */
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#endif
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register guint16 *o;
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guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels;
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bpl = image->bpl;
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for (yy = y1; yy < y2; yy++)
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{
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#ifdef LITTLE
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s = (guint32 *) srow;
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#else
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s = srow;
|
||
#endif
|
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o = (guint16 *) orow;
|
||
|
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/* check for first pixel odd */
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xx = x1;
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if (xx & 1)
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{
|
||
register guint16 data;
|
||
#ifdef LITTLE
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data = *((short *) s);
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#else
|
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data = *((short *) s);
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data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
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#endif
|
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((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7);
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((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3);
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((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7);
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o = (guint16 *) (((char *) o) + 3);
|
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++xx;
|
||
}
|
||
|
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g_assert (!(xx & 1));
|
||
|
||
/* if x2 is even, then the -1 does nothing to number of
|
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* 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;
|
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*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
|
||
| (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21;
|
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*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 (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 = (guint8*)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);
|
||
|
||
o = (guint16 *) (((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[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 (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 = (guint8*)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 = (guint8*)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 = (guint8*)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;
|
||
o = (guint16 *) (((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[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 (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 = (guint8*)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;
|
||
|
||
o = (guint16 *) (((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[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 (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 = (guint8*)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 = (guint8*)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 = (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;
|
||
#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 = (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);
|
||
|
||
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);
|
||
}
|
||
|
||
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);
|
||
}
|
||
|
||
/* 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 (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;
|
||
}
|