/* GdkPixbuf library - convert X drawable information to RGB * * Copyright (C) 1999 Michael Zucchi * * Authors: Michael Zucchi * Cody Russell * Federico Mena-Quintero * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include #include "gdk.h" /* For gdk_screen_width/gdk_screen_height */ #include "gdkcolor.h" #include "gdkimage.h" #include "gdkvisual.h" #include "gdkwindow.h" #include "gdkpixbuf.h" #include "gdk-pixbuf-private.h" #if (G_BYTE_ORDER == G_LITTLE_ENDIAN) #define LITTLE #endif #define d(x) static guint32 mask_table[] = { 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff, 0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff, 0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff, 0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff }; /* * convert 1 bits-pixel data * no alpha */ static void rgb1 (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *s; register guint8 data; guint8 *o; guint8 *srow = image->mem, *orow = pixels; d (printf ("1 bits/pixel\n")); /* convert upto 8 pixels/time */ /* its probably not worth trying to make this run very fast, who uses * 1 bit displays anymore? */ width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx ++) { data = srow[xx >> 3] >> (7 - (xx & 7)) & 1; *o++ = colormap->colors[data].red; *o++ = colormap->colors[data].green; *o++ = colormap->colors[data].blue; } srow += bpl; orow += rowstride; } } /* * convert 1 bits/pixel data * with alpha */ static void rgb1a (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *s; register guint8 data; guint8 *o; guint8 *srow = image->mem, *orow = pixels; guint32 remap[2]; d (printf ("1 bits/pixel\n")); /* convert upto 8 pixels/time */ /* its probably not worth trying to make this run very fast, who uses * 1 bit displays anymore? */ width = image->width; height = image->height; bpl = image->bpl; for (xx = 0; xx < 2; xx++) { #ifdef LITTLE remap[xx] = 0xff000000 | colormap->colors[xx].blue << 16 | colormap->colors[xx].green << 8 | colormap->colors[xx].red; #else remap[xx] = 0xff | colormap->colors[xx].red << 24 | colormap->colors[xx].green << 16 | colormap->colors[xx].blue << 8; #endif } for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx ++) { data = srow[xx >> 3] >> (7 - (xx & 7)) & 1; *o++ = remap[data]; } srow += bpl; orow += rowstride; } } /* * convert 8 bits/pixel data * no alpha */ static void rgb8 (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint32 mask; register guint32 data; guint8 *srow = image->mem, *orow = pixels; register guint8 *s; register guint8 *o; width = image->width; height = image->height; bpl = image->bpl; d (printf ("8 bit, no alpha output\n")); mask = mask_table[image->depth]; for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx++) { data = *s++ & mask; *o++ = colormap->colors[data].red; *o++ = colormap->colors[data].green; *o++ = colormap->colors[data].blue; } srow += bpl; orow += rowstride; } } /* * convert 8 bits/pixel data * with alpha */ static void rgb8a (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint32 mask; register guint32 data; guint32 remap[256]; register guint8 *s; /* read 2 pixels at once */ register guint32 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; d (printf ("8 bit, with alpha output\n")); mask = mask_table[image->depth]; for (xx = 0; xx < colormap->size; xx++) { #ifdef LITTLE remap[xx] = 0xff000000 | colormap->colors[xx].blue << 16 | colormap->colors[xx].green << 8 | colormap->colors[xx].red; #else remap[xx] = 0xff | colormap->colors[xx].red << 24 | colormap->colors[xx].green << 16 | colormap->colors[xx].blue << 8; #endif } for (yy = 0; yy < height; yy++) { s = srow; o = (guint32 *) orow; for (xx = 0; xx < width; xx ++) { data = *s++ & mask; *o++ = remap[data]; } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * no alpha * data in lsb format */ static void rgb565lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint32 *s; /* read 2 pixels at once */ #else register guint8 *s; /* read 2 pixels at once */ #endif register guint16 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint32 *) srow; #else s = srow; #endif o = (guint16 *) orow; for (xx = 1; xx < width; xx += 2) { register guint32 data; #ifdef LITTLE data = *s++; *o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13 | (data & 0x7e0) << 5 | (data & 0x600) >> 1; *o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2 | (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21; *o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25 | (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10; #else /* swap endianness first */ data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24; s += 4; *o++ = (data & 0xf800) | (data & 0xe000) >> 5 | (data & 0x7e0) >> 3 | (data & 0x600) >> 9; *o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6 | (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29; *o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17 | (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18; #endif } /* check for last remaining pixel */ if (width & 1) { register guint16 data; #ifdef LITTLE data = *((short *) s); #else data = *((short *) s); data = ((data >> 8) & 0xff) | ((data & 0xff) << 8); #endif ((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7); ((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3); ((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7); } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * no alpha * data in msb format */ static void rgb565msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint8 *s; /* need to swap data order */ #else register guint32 *s; /* read 2 pixels at once */ #endif register guint16 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = srow; #else s = (guint32 *) srow; #endif o = (guint16 *) orow; for (xx = 1; xx < width; xx += 2) { register guint32 data; #ifdef LITTLE /* swap endianness first */ data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24; s += 4; *o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13 | (data & 0x7e0) << 5 | (data & 0x600) >> 1; *o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2 | (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21; *o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25 | (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10; #else data = *s++; *o++ = (data & 0xf800) | (data & 0xe000) >> 5 | (data & 0x7e0) >> 3 | (data & 0x600) >> 9; *o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6 | (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29; *o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17 | (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18; #endif } /* check for last remaining pixel */ if (width & 1) { register guint16 data; #ifdef LITTLE data = *((short *) s); data = ((data >> 8) & 0xff) | ((data & 0xff) << 8); #else data = *((short *) s); #endif ((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7); ((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3); ((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7); } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * with alpha * data in lsb format */ static void rgb565alsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint16 *s; /* read 1 pixels at once */ #else register guint8 *s; #endif register guint32 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint16 *) srow; #else s = (guint8 *) srow; #endif o = (guint32 *) orow; for (xx = 0; xx < width; xx ++) { register guint32 data; /* rrrrrggg gggbbbbb -> rrrrrRRR ggggggGG bbbbbBBB aaaaaaaa */ /* little endian: aaaaaaaa bbbbbBBB ggggggGG rrrrrRRR */ #ifdef LITTLE data = *s++; *o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13 | (data & 0x7e0) << 5 | (data & 0x600) >> 1 | (data & 0x1f) << 19 | (data & 0x1c) << 14 | 0xff000000; #else /* swap endianness first */ data = s[0] | s[1] << 8; s += 2; *o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11 | (data & 0x7e0) << 13 | (data & 0x600) << 7 | (data & 0x1f) << 11 | (data & 0x1c) << 6 | 0xff; #endif } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * with alpha * data in msb format */ static void rgb565amsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint8 *s; #else register guint16 *s; /* read 1 pixels at once */ #endif register guint32 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { s = srow; o = (guint32 *) orow; for (xx = 0; xx < width; xx ++) { register guint32 data; /* rrrrrggg gggbbbbb -> rrrrrRRR gggggg00 bbbbbBBB aaaaaaaa */ /* little endian: aaaaaaaa bbbbbBBB gggggg00 rrrrrRRR */ #ifdef LITTLE /* swap endianness first */ data = s[0] | s[1] << 8; s += 2; *o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13 | (data & 0x7e0) << 5 | (data & 0x600) >> 1 | (data & 0x1f) << 19 | (data & 0x1c) << 14 | 0xff000000; #else data = *s++; *o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11 | (data & 0x7e0) << 13 | (data & 0x600) << 7 | (data & 0x1f) << 11 | (data & 0x1c) << 6 | 0xff; #endif } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * no alpha * data in lsb format */ static void rgb555lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint32 *s; /* read 2 pixels at once */ #else register guint8 *s; /* read 2 pixels at once */ #endif register guint16 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint32 *) srow; #else s = srow; #endif o = (guint16 *) orow; for (xx = 1; xx < width; xx += 2) { register guint32 data; #ifdef LITTLE data = *s++; *o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12 | (data & 0x3e0) << 6 | (data & 0x380) << 1; *o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2 | (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20; *o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23 | (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10; #else /* swap endianness first */ data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24; s += 4; *o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4 | (data & 0x3e0) >> 2 | (data & 0x380) >> 7; *o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6 | (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28; *o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15 | (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18; #endif } /* check for last remaining pixel */ if (width & 1) { register guint16 data; #ifdef LITTLE data = *((short *) s); #else data = *((short *) s); data = ((data >> 8) & 0xff) | ((data & 0xff) << 8); #endif ((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12; ((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7; ((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2; } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * no alpha * data in msb format */ static void rgb555msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint8 *s; /* read 2 pixels at once */ #else register guint32 *s; /* read 2 pixels at once */ #endif register guint16 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { s = srow; o = (guint16 *) orow; for (xx = 1; xx < width; xx += 2) { register guint32 data; #ifdef LITTLE /* swap endianness first */ data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24; s += 4; *o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12 | (data & 0x3e0) << 6 | (data & 0x380) << 1; *o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2 | (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20; *o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23 | (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10; #else data = *s++; *o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4 | (data & 0x3e0) >> 2 | (data & 0x380) >> 7; *o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6 | (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28; *o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15 | (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18; #endif } /* check for last remaining pixel */ if (width & 1) { register guint16 data; #ifdef LITTLE data = *((short *) s); data = ((data >> 8) & 0xff) | ((data & 0xff) << 8); #else data = *((short *) s); #endif ((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12; ((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7; ((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2; } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * with alpha * data in lsb format */ static void rgb555alsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint16 *s; /* read 1 pixels at once */ #else register guint8 *s; #endif register guint32 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint16 *) srow; #else s = srow; #endif o = (guint32 *) orow; for (xx = 0; xx < width; xx++) { register guint32 data; /* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */ /* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */ #ifdef LITTLE data = *s++; *o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12 | (data & 0x3e0) << 6 | (data & 0x380) << 1 | (data & 0x1f) << 19 | (data & 0x1c) << 14 | 0xff000000; #else /* swap endianness first */ data = s[0] | s[1] << 8; s += 2; *o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12 | (data & 0x3e0) << 14 | (data & 0x380) << 9 | (data & 0x1f) << 11 | (data & 0x1c) << 6 | 0xff; #endif } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * with alpha * data in msb format */ static void rgb555amsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; #ifdef LITTLE register guint16 *s; /* read 1 pixels at once */ #else register guint8 *s; #endif register guint32 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint16 *) srow; #else s = srow; #endif o = (guint32 *) orow; for (xx = 0; xx < width; xx++) { register guint32 data; /* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */ /* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */ #ifdef LITTLE /* swap endianness first */ data = s[0] | s[1] << 8; s += 2; *o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12 | (data & 0x3e0) << 6 | (data & 0x380) << 1 | (data & 0x1f) << 19 | (data & 0x1c) << 14 | 0xff000000; #else data = *s++; *o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12 | (data & 0x3e0) << 14 | (data & 0x380) << 9 | (data & 0x1f) << 11 | (data & 0x1c) << 6 | 0xff; #endif } srow += bpl; orow += rowstride; } } static void rgb888alsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *s; /* for byte order swapping */ guint8 *o; guint8 *srow = image->mem, *orow = pixels; width = image->width; height = image->height; bpl = image->bpl; d (printf ("32 bits/pixel with alpha\n")); /* lsb data */ for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx++) { *o++ = s[2]; *o++ = s[1]; *o++ = s[0]; *o++ = 0xff; s += 4; } srow += bpl; orow += rowstride; } } static void rgb888lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *srow = image->mem, *orow = pixels; guint8 *o, *s; width = image->width; height = image->height; bpl = image->bpl; d (printf ("32 bit, lsb, no alpha\n")); for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx++) { *o++ = s[2]; *o++ = s[1]; *o++ = s[0]; s += 4; } srow += bpl; orow += rowstride; } } static void rgb888amsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *srow = image->mem, *orow = pixels; #ifdef LITTLE guint32 *o; guint32 *s; #else guint8 *s; /* for byte order swapping */ guint8 *o; #endif d (printf ("32 bit, msb, with alpha\n")); width = image->width; height = image->height; bpl = image->bpl; /* msb data */ for (yy = 0; yy < height; yy++) { #ifdef LITTLE s = (guint32 *) srow; o = (guint32 *) orow; #else s = srow; o = orow; #endif for (xx = 0; xx < width; xx++) { #ifdef LITTLE *o++ = s[1]; *o++ = s[2]; *o++ = s[3]; *o++ = 0xff; s += 4; #else *o++ = (*s << 8) | 0xff; /* untested */ s++; #endif } srow += bpl; orow += rowstride; } } static void rgb888msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap) { int xx, yy; int width, height; int bpl; guint8 *srow = image->mem, *orow = pixels; guint8 *s; guint8 *o; d (printf ("32 bit, msb, no alpha\n")); width = image->width; height = image->height; bpl = image->bpl; for (yy = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; xx++) { *o++ = s[1]; *o++ = s[2]; *o++ = s[3]; s += 4; } srow += bpl; orow += rowstride; } } /* * This should work correctly with any display/any endianness, but will probably * run quite slow */ static void convert_real_slow (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *cmap, int alpha) { int xx, yy; int width, height; int bpl; guint8 *srow = image->mem, *orow = pixels; guint8 *s; guint8 *o; guint32 pixel; GdkVisual *v; guint8 component; int i; width = image->width; height = image->height; 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 = 0; yy < height; yy++) { s = srow; o = orow; for (xx = 0; xx < width; 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; } srow += bpl; orow += rowstride; } } typedef void (* cfunc) (GdkImage *image, guchar *pixels, int rowstride, 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, int alpha, GdkColormap *cmap) { int index = (image->byte_order == GDK_MSB_FIRST) | (alpha != 0) << 1; int bank=5; /* default fallback converter */ GdkVisual *v = gdk_colormap_get_visual(cmap); d(printf("masks = %x:%x:%x\n", v->red_mask, v->green_mask, v->blue_mask)); d(printf("image depth = %d, bpp = %d\n", image->depth, image->bpp)); 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->bpp) { case 1: bank = 0; break; case 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->bpp == 16) bank = 2; break; case 16: if (v->red_mask == 0xf800 && v->green_mask == 0x7e0 && v->blue_mask == 0x1f && image->bpp == 16) bank = 3; break; case 24: case 32: if (v->red_mask == 0xff0000 && v->green_mask == 0xff00 && v->blue_mask == 0xff && image->bpp == 32) bank = 4; break; } break; case GDK_VISUAL_DIRECT_COLOR: /* always use the slow version */ break; } d(printf("converting using conversion function in bank %d\n", bank)); if (bank==5) { convert_real_slow(image, pixels, rowstride, cmap, alpha); } else { index |= bank << 2; (* convert_map[index]) (image, pixels, rowstride, cmap); } } /* 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 is a pixmap. If it is a window, this argument will * be ignored. * @src_x: Source X coordinate within drawable. * @src_y: Source Y coordinate within drawable. * @dest_x: Destination X coordinate in pixbuf, or 0 if @dest is NULL. * @dest_y: Destination Y coordinate in pixbuf, or 0 if @dest is NULL. * @width: Width in pixels of region to get. * @height: Height in pixels of region to get. * * Transfers image data from a Gdk drawable and converts it to an RGB(A) * representation inside a GdkPixbuf. * * If the drawable @src is a pixmap, then a suitable colormap must be specified, * since pixmaps are just blocks of pixel data without an associated colormap. * If the drawable is a window, the @cmap argument will be ignored and the * window's own colormap will be used instead. * * If the specified destination pixbuf @dest is #NULL, then this function will * create an RGB pixbuf with 8 bits per channel and no alpha, with the same size * specified by the @width and @height arguments. In this case, the @dest_x and * @dest_y arguments must be specified as 0, otherwise the function will return * #NULL. If the specified destination pixbuf is not NULL and it contains alpha * information, then the filled pixels will be set to full opacity. * * If the specified drawable is a pixmap, then the requested source rectangle * must be completely contained within the pixmap, otherwise the function will * return #NULL. * * If the specified drawable is a window, then it must be viewable, i.e. all of * its ancestors up to the root window must be mapped. Also, the specified * source rectangle must be completely contained within the window and within * the screen. If regions of the window are obscured by noninferior windows, the * contents of those regions are undefined. The contents of regions obscured by * inferior windows of a different depth than that of the source window will also * be undefined. * * Return value: The same pixbuf as @dest if it was non-NULL, or a newly-created * pixbuf with a reference count of 1 if no destination pixbuf was specified; in * the latter case, NULL will be returned if not enough memory could be * allocated for the pixbuf to be created. **/ GdkPixbuf * gdk_pixbuf_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 rowstride, bpp, alpha; /* General sanity checks */ g_return_val_if_fail (src != NULL, NULL); if (GDK_IS_PIXMAP (src)) g_return_val_if_fail (cmap != NULL, NULL); else /* 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); } /* Coordinate sanity checks */ gdk_drawable_get_size (src, &src_width, &src_height); g_return_val_if_fail (src_x >= 0 && src_y >= 0, NULL); g_return_val_if_fail (src_x + width <= src_width && src_y + height <= src_height, NULL); if (dest) { g_return_val_if_fail (dest_x >= 0 && dest_y >= 0, NULL); g_return_val_if_fail (dest_x + width <= dest->width, NULL); g_return_val_if_fail (dest_y + height <= dest->height, NULL); } if (!GDK_IS_PIXMAP (src)) { int ret; int src_xorigin, src_yorigin; int screen_width, screen_height; int screen_srcx, screen_srcy; ret = gdk_window_get_origin (src, &src_xorigin, &src_yorigin); g_return_val_if_fail (ret != FALSE, NULL); screen_width = gdk_screen_width (); screen_height = gdk_screen_height (); screen_srcx = src_xorigin + src_x; screen_srcy = src_yorigin + src_y; g_return_val_if_fail (screen_srcx >= 0 && screen_srcy >= 0, NULL); g_return_val_if_fail (screen_srcx + width <= screen_width, NULL); g_return_val_if_fail (screen_srcy + height <= screen_height, NULL); } /* Get Image in ZPixmap format (packed bits). */ image = gdk_image_get (src, src_x, src_y, width, height); g_return_val_if_fail (image != NULL, NULL); /* Create the pixbuf if needed */ if (!dest) { dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height); if (!dest) { gdk_image_destroy(image); return NULL; } } /* Get the colormap if needed */ if (!GDK_IS_PIXMAP (src)) cmap = gdk_window_get_colormap (src); alpha = dest->has_alpha; rowstride = dest->rowstride; bpp = alpha ? 4 : 3; /* we offset into the image data based on the position we are retrieving from */ rgbconvert (image, dest->pixels + (dest_y * rowstride) + (dest_x * bpp), rowstride, alpha, cmap); gdk_image_destroy(image); return dest; }