1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
22 #include <sys/types.h>
23 #include <sys/param.h>
25 #include "gtkpreview.h"
26 #include "gtksignal.h"
29 #define IMAGE_SIZE 256
30 #define PREVIEW_CLASS(w) GTK_PREVIEW_CLASS (GTK_OBJECT (w)->klass)
31 #define COLOR_COMPOSE(r,g,b) (lookup_red[r] | lookup_green[g] | lookup_blue[b])
34 typedef struct _GtkPreviewProp GtkPreviewProp;
35 typedef void (*GtkTransferFunc) (guchar *dest, guchar *src, gint count);
37 struct _GtkPreviewProp
41 guint16 ngreen_shades;
47 static void gtk_preview_class_init (GtkPreviewClass *klass);
48 static void gtk_preview_init (GtkPreview *preview);
49 static void gtk_preview_finalize (GtkObject *object);
50 static void gtk_preview_realize (GtkWidget *widget);
51 static gint gtk_preview_expose (GtkWidget *widget,
52 GdkEventExpose *event);
53 static void gtk_preview_make_buffer (GtkPreview *preview);
54 static void gtk_preview_get_visuals (GtkPreviewClass *klass);
55 static void gtk_preview_get_cmaps (GtkPreviewClass *klass);
56 static void gtk_preview_dither_init (GtkPreviewClass *klass);
57 static void gtk_fill_lookup_array (gulong *array,
61 static void gtk_trim_cmap (GtkPreviewClass *klass);
62 static void gtk_create_8_bit (GtkPreviewClass *klass);
64 static void gtk_color_8 (guchar *src,
69 static void gtk_color_16 (guchar *src,
72 static void gtk_color_24 (guchar *src,
75 static void gtk_grayscale_8 (guchar *src,
80 static void gtk_grayscale_16 (guchar *src,
83 static void gtk_grayscale_24 (guchar *src,
87 static gint gtk_get_preview_prop (guint *nred,
91 static void gtk_set_preview_prop (guint nred,
96 /* transfer functions:
97 * destination byte order/source bpp/destination bpp
99 static void gtk_lsbmsb_1_1 (guchar *dest,
102 static void gtk_lsb_2_2 (guchar *dest,
105 static void gtk_msb_2_2 (guchar *dest,
108 static void gtk_lsb_3_3 (guchar *dest,
111 static void gtk_msb_3_3 (guchar *dest,
114 static void gtk_lsb_3_4 (guchar *dest,
117 static void gtk_msb_3_4 (guchar *dest,
122 static GtkWidgetClass *parent_class = NULL;
123 static GtkPreviewClass *preview_class = NULL;
124 static GtkPreviewInfo *preview_info = NULL;
125 static gint install_cmap = FALSE;
129 gtk_preview_get_type (void)
131 static guint preview_type = 0;
135 GtkTypeInfo preview_info =
139 sizeof (GtkPreviewClass),
140 (GtkClassInitFunc) gtk_preview_class_init,
141 (GtkObjectInitFunc) gtk_preview_init,
142 (GtkArgSetFunc) NULL,
143 (GtkArgGetFunc) NULL,
146 preview_type = gtk_type_unique (gtk_widget_get_type (), &preview_info);
153 gtk_preview_class_init (GtkPreviewClass *klass)
155 GtkObjectClass *object_class;
156 GtkWidgetClass *widget_class;
158 object_class = (GtkObjectClass*) klass;
159 widget_class = (GtkWidgetClass*) klass;
161 parent_class = gtk_type_class (gtk_widget_get_type ());
162 preview_class = klass;
164 object_class->finalize = gtk_preview_finalize;
166 widget_class->realize = gtk_preview_realize;
167 widget_class->expose_event = gtk_preview_expose;
170 klass->info = *preview_info;
173 klass->info.visual = NULL;
174 klass->info.cmap = NULL;
176 klass->info.color_pixels = NULL;
177 klass->info.gray_pixels = NULL;
178 klass->info.reserved_pixels = NULL;
180 klass->info.lookup_red = NULL;
181 klass->info.lookup_green = NULL;
182 klass->info.lookup_blue = NULL;
184 klass->info.dither_red = NULL;
185 klass->info.dither_green = NULL;
186 klass->info.dither_blue = NULL;
187 klass->info.dither_gray = NULL;
188 klass->info.dither_matrix = NULL;
190 klass->info.nred_shades = 6;
191 klass->info.ngreen_shades = 6;
192 klass->info.nblue_shades = 4;
193 klass->info.ngray_shades = 24;
194 klass->info.nreserved = 0;
197 klass->info.cmap_alloced = FALSE;
198 klass->info.gamma = 1.0;
203 gtk_preview_get_visuals (klass);
204 gtk_preview_get_cmaps (klass);
205 gtk_preview_dither_init (klass);
209 gtk_preview_reset (void)
211 GtkPreviewInfo *info;
213 if (!preview_class || !preview_info)
216 info = &preview_class->info;
218 gtk_preview_uninit();
220 if (info->color_pixels)
222 gdk_colors_free (info->cmap,
225 info->ngreen_shades *
229 gdk_colors_free (info->cmap,
231 info->ngray_shades, 0);
233 g_free (info->color_pixels);
234 g_free (info->gray_pixels);
237 if (info->reserved_pixels)
239 gdk_colors_free (info->cmap,
240 info->reserved_pixels,
242 g_free (info->reserved_pixels);
245 if (info->cmap && info->cmap_alloced)
246 gdk_colormap_unref (info->cmap);
248 if (info->lookup_red)
250 g_free (info->lookup_red);
251 g_free (info->lookup_green);
252 g_free (info->lookup_blue);
255 if (info->dither_matrix)
259 for (i= 0 ; i < 8 ; i++)
261 for (j = 0; j < 8 ; j++)
262 g_free (info->dither_matrix[i][j]);
263 g_free (info->dither_matrix[i]);
265 g_free (info->dither_matrix);
266 g_free (info->dither_red);
267 g_free (info->dither_green);
268 g_free (info->dither_blue);
271 preview_class->info = *preview_info;
273 gtk_preview_get_visuals (preview_class);
274 gtk_preview_get_cmaps (preview_class);
275 gtk_preview_dither_init (preview_class);
279 gtk_preview_init (GtkPreview *preview)
281 GTK_WIDGET_SET_FLAGS (preview, GTK_BASIC);
283 preview->buffer = NULL;
284 preview->buffer_width = 0;
285 preview->buffer_height = 0;
286 preview->expand = FALSE;
290 gtk_preview_uninit (void)
292 GtkPreviewProp *prop;
295 /* FIXME: need to grab the server here to prevent a race condition */
297 if (preview_class && !install_cmap && preview_class->info.visual &&
298 (preview_class->info.visual->type != GDK_VISUAL_TRUE_COLOR) &&
299 (preview_class->info.visual->type != GDK_VISUAL_DIRECT_COLOR))
301 property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE);
303 if (gdk_property_get (NULL, property, property,
304 0, sizeof (GtkPreviewProp), FALSE,
305 NULL, NULL, NULL, (guchar**) &prop))
307 prop->ref_count = prop->ref_count - 1;
308 if (prop->ref_count == 0)
310 gdk_property_delete (NULL, property);
314 gdk_property_change (NULL, property, property, 16,
315 GDK_PROP_MODE_REPLACE,
323 gtk_preview_new (GtkPreviewType type)
327 preview = gtk_type_new (gtk_preview_get_type ());
328 preview->type = type;
330 return GTK_WIDGET (preview);
334 gtk_preview_size (GtkPreview *preview,
338 g_return_if_fail (preview != NULL);
339 g_return_if_fail (GTK_IS_PREVIEW (preview));
341 if ((width != GTK_WIDGET (preview)->requisition.width) ||
342 (height != GTK_WIDGET (preview)->requisition.height))
344 GTK_WIDGET (preview)->requisition.width = width;
345 GTK_WIDGET (preview)->requisition.height = height;
348 g_free (preview->buffer);
349 preview->buffer = NULL;
354 gtk_preview_put (GtkPreview *preview,
366 GdkRectangle r1, r2, r3;
367 GtkTransferFunc transfer_func;
372 guint dest_rowstride;
377 g_return_if_fail (preview != NULL);
378 g_return_if_fail (GTK_IS_PREVIEW (preview));
379 g_return_if_fail (window != NULL);
381 if (!preview->buffer)
384 widget = GTK_WIDGET (preview);
388 r1.width = preview->buffer_width;
389 r1.height = preview->buffer_height;
396 if (!gdk_rectangle_intersect (&r1, &r2, &r3))
399 x2 = r3.x + r3.width;
400 y2 = r3.y + r3.height;
402 if (!preview_class->image)
403 preview_class->image = gdk_image_new (GDK_IMAGE_FASTEST,
404 preview_class->info.visual,
405 IMAGE_SIZE, IMAGE_SIZE);
406 image = preview_class->image;
407 src_bpp = preview_class->info.bpp;
409 image_mem = image->mem;
410 dest_bpp = image->bpp;
411 dest_rowstride = image->bpl;
413 transfer_func = NULL;
421 transfer_func = gtk_lsbmsb_1_1;
429 if (image->byte_order == GDK_MSB_FIRST)
430 transfer_func = gtk_msb_2_2;
432 transfer_func = gtk_lsb_2_2;
442 if (image->byte_order == GDK_MSB_FIRST)
443 transfer_func = gtk_msb_3_3;
445 transfer_func = gtk_lsb_3_3;
453 if (image->byte_order == GDK_MSB_FIRST)
454 transfer_func = gtk_msb_3_4;
456 transfer_func = gtk_lsb_3_4;
464 g_warning ("unsupported byte order/src bpp/dest bpp combination: %s:%d:%d",
465 (image->byte_order == GDK_MSB_FIRST) ? "msb" : "lsb", src_bpp, dest_bpp);
469 for (y = r3.y; y < y2; y += IMAGE_SIZE)
471 for (x = r3.x; x < x2; x += IMAGE_SIZE)
481 for (i = y; i < ye; i++)
483 src = preview->buffer + (((gulong) (i - r1.y) * (gulong) preview->buffer_width) +
484 (x - r1.x)) * (gulong) src_bpp;
485 dest = image_mem + ((gulong) (i - y) * dest_rowstride);
488 (* transfer_func) (dest, src, xe - x);
491 gdk_draw_image (window, gc,
493 destx + (r3.x - srcx) + (x - r3.x),
494 desty + (r3.y - srcy) + (y - r3.y),
502 gtk_preview_put_row (GtkPreview *preview,
509 g_return_if_fail (preview != NULL);
510 g_return_if_fail (GTK_IS_PREVIEW (preview));
511 g_return_if_fail (src != NULL);
512 g_return_if_fail (dest != NULL);
514 switch (preview->type)
516 case GTK_PREVIEW_COLOR:
517 switch (preview_class->info.visual->depth)
520 gtk_color_8 (src, dest, x, y, w);
524 gtk_color_16 (src, dest, w);
528 gtk_color_24 (src, dest, w);
532 case GTK_PREVIEW_GRAYSCALE:
533 switch (preview_class->info.visual->depth)
536 gtk_grayscale_8 (src, dest, x, y, w);
540 gtk_grayscale_16 (src, dest, w);
544 gtk_grayscale_24 (src, dest, w);
552 gtk_preview_draw_row (GtkPreview *preview,
560 g_return_if_fail (preview != NULL);
561 g_return_if_fail (GTK_IS_PREVIEW (preview));
562 g_return_if_fail (data != NULL);
563 g_return_if_fail (preview_class->info.visual != NULL);
565 if ((w <= 0) || (y < 0))
568 g_return_if_fail (data != NULL);
570 gtk_preview_make_buffer (preview);
572 if (y >= preview->buffer_height)
575 switch (preview->type)
577 case GTK_PREVIEW_COLOR:
578 switch (preview_class->info.visual->depth)
581 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x);
582 gtk_color_8 (data, dest, x, y, w);
586 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 2;
587 gtk_color_16 (data, dest, w);
591 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 3;
592 gtk_color_24 (data, dest, w);
596 case GTK_PREVIEW_GRAYSCALE:
597 switch (preview_class->info.visual->depth)
600 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x);
601 gtk_grayscale_8 (data, dest, x, y, w);
605 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 2;
606 gtk_grayscale_16 (data, dest, w);
610 dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 3;
611 gtk_grayscale_24 (data, dest, w);
619 gtk_preview_set_expand (GtkPreview *preview,
622 g_return_if_fail (preview != NULL);
623 g_return_if_fail (GTK_IS_PREVIEW (preview));
625 preview->expand = (expand != FALSE);
629 gtk_preview_set_gamma (double _gamma)
633 preview_info = g_new0 (GtkPreviewInfo, 1);
634 preview_info->nred_shades = 6;
635 preview_info->ngreen_shades = 6;
636 preview_info->nblue_shades = 4;
637 preview_info->ngray_shades = 24;
640 preview_info->gamma = _gamma;
644 gtk_preview_set_color_cube (guint nred_shades,
651 preview_info = g_new0 (GtkPreviewInfo, 1);
652 preview_info->gamma = 1.0;
655 preview_info->nred_shades = nred_shades;
656 preview_info->ngreen_shades = ngreen_shades;
657 preview_info->nblue_shades = nblue_shades;
658 preview_info->ngray_shades = ngray_shades;
662 gtk_preview_set_install_cmap (gint _install_cmap)
664 install_cmap = _install_cmap;
668 gtk_preview_set_reserved (gint nreserved)
671 preview_info = g_new0 (GtkPreviewInfo, 1);
673 preview_info->nreserved = nreserved;
677 gtk_preview_get_visual (void)
680 preview_class = gtk_type_class (gtk_preview_get_type ());
682 return preview_class->info.visual;
686 gtk_preview_get_cmap (void)
689 preview_class = gtk_type_class (gtk_preview_get_type ());
691 return preview_class->info.cmap;
695 gtk_preview_get_info (void)
698 preview_class = gtk_type_class (gtk_preview_get_type ());
700 return &preview_class->info;
705 gtk_preview_finalize (GtkObject *object)
709 g_return_if_fail (object != NULL);
710 g_return_if_fail (GTK_IS_PREVIEW (object));
712 preview = GTK_PREVIEW (object);
714 g_free (preview->buffer);
715 preview->type = (GtkPreviewType) -1;
717 (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
721 gtk_preview_realize (GtkWidget *widget)
724 GdkWindowAttr attributes;
725 gint attributes_mask;
727 g_return_if_fail (widget != NULL);
728 g_return_if_fail (GTK_IS_PREVIEW (widget));
730 GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
731 preview = GTK_PREVIEW (widget);
733 attributes.window_type = GDK_WINDOW_CHILD;
734 attributes.x = widget->allocation.x;
735 attributes.y = widget->allocation.y;
736 attributes.width = widget->allocation.width;
737 attributes.height = widget->allocation.height;
738 attributes.wclass = GDK_INPUT_OUTPUT;
739 attributes.visual = preview_class->info.visual;
740 attributes.colormap = preview_class->info.cmap;
741 attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
742 attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
744 widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
745 gdk_window_set_user_data (widget->window, widget);
747 widget->style = gtk_style_attach (widget->style, widget->window);
748 gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
752 gtk_preview_expose (GtkWidget *widget,
753 GdkEventExpose *event)
757 g_return_val_if_fail (widget != NULL, FALSE);
758 g_return_val_if_fail (GTK_IS_PREVIEW (widget), FALSE);
759 g_return_val_if_fail (event != NULL, FALSE);
761 if (GTK_WIDGET_DRAWABLE (widget))
763 preview = GTK_PREVIEW (widget);
765 gtk_preview_put (GTK_PREVIEW (widget),
766 widget->window, widget->style->black_gc,
768 (widget->allocation.width - preview->buffer_width)/2,
770 (widget->allocation.height - preview->buffer_height)/2,
771 event->area.x, event->area.y,
772 event->area.width, event->area.height);
779 gtk_preview_make_buffer (GtkPreview *preview)
785 g_return_if_fail (preview != NULL);
786 g_return_if_fail (GTK_IS_PREVIEW (preview));
788 widget = GTK_WIDGET (preview);
790 if (preview->expand &&
791 (widget->allocation.width != 0) &&
792 (widget->allocation.height != 0))
794 width = widget->allocation.width;
795 height = widget->allocation.height;
799 width = widget->requisition.width;
800 height = widget->requisition.height;
803 if (!preview->buffer ||
804 (preview->buffer_width != width) ||
805 (preview->buffer_height != height))
808 g_free (preview->buffer);
810 preview->buffer_width = width;
811 preview->buffer_height = height;
813 preview->buffer = g_new0 (guchar,
814 preview->buffer_width *
815 preview->buffer_height *
816 preview_class->info.bpp);
821 gtk_preview_get_visuals (GtkPreviewClass *klass)
823 static GdkVisualType types[] =
825 GDK_VISUAL_TRUE_COLOR,
826 GDK_VISUAL_DIRECT_COLOR,
827 GDK_VISUAL_TRUE_COLOR,
828 GDK_VISUAL_DIRECT_COLOR,
829 GDK_VISUAL_TRUE_COLOR,
830 GDK_VISUAL_DIRECT_COLOR,
831 GDK_VISUAL_TRUE_COLOR,
832 GDK_VISUAL_DIRECT_COLOR,
833 GDK_VISUAL_PSEUDO_COLOR
835 static gint depths[] = { 24, 24, 32, 32, 16, 16, 15, 15, 8 };
836 static gint nvisual_types = sizeof (types) / sizeof (types[0]);
840 g_return_if_fail (klass != NULL);
842 if (!klass->info.visual)
843 for (i = 0; i < nvisual_types; i++)
844 if ((klass->info.visual = gdk_visual_get_best_with_both (depths[i], types[i])))
846 if ((klass->info.visual->type == GDK_VISUAL_TRUE_COLOR) ||
847 (klass->info.visual->type == GDK_VISUAL_DIRECT_COLOR))
849 klass->info.lookup_red = g_new (gulong, 256);
850 klass->info.lookup_green = g_new (gulong, 256);
851 klass->info.lookup_blue = g_new (gulong, 256);
853 gtk_fill_lookup_array (klass->info.lookup_red,
854 klass->info.visual->depth,
855 klass->info.visual->red_shift,
856 8 - klass->info.visual->red_prec);
857 gtk_fill_lookup_array (klass->info.lookup_green,
858 klass->info.visual->depth,
859 klass->info.visual->green_shift,
860 8 - klass->info.visual->green_prec);
861 gtk_fill_lookup_array (klass->info.lookup_blue,
862 klass->info.visual->depth,
863 klass->info.visual->blue_shift,
864 8 - klass->info.visual->blue_prec);
869 if (!klass->info.visual)
871 g_warning ("unable to find a suitable visual for color image display.\n");
875 /* If we are _not_ running with an installed cmap, we must run
876 * with the system visual. Otherwise, we let GDK pick the visual,
877 * and it makes some effort to pick a non-default visual, which
878 * will hopefully provide minimum color flashing.
880 if ((klass->info.visual->depth == gdk_visual_get_system()->depth) &&
881 (klass->info.visual->type == gdk_visual_get_system()->type) &&
884 klass->info.visual = gdk_visual_get_system();
887 switch (klass->info.visual->depth)
904 gtk_preview_get_cmaps (GtkPreviewClass *klass)
906 g_return_if_fail (klass != NULL);
907 g_return_if_fail (klass->info.visual != NULL);
909 if ((klass->info.visual->type != GDK_VISUAL_TRUE_COLOR) &&
910 (klass->info.visual->type != GDK_VISUAL_DIRECT_COLOR))
914 klass->info.cmap = gdk_colormap_new (klass->info.visual, FALSE);
915 klass->info.cmap_alloced = install_cmap;
917 gtk_trim_cmap (klass);
918 gtk_create_8_bit (klass);
928 klass->info.cmap = gdk_colormap_get_system ();
931 if (gtk_get_preview_prop (&nred, &ngreen, &nblue, &ngray))
935 klass->info.nred_shades = nred;
936 klass->info.ngreen_shades = ngreen;
937 klass->info.nblue_shades = nblue;
938 klass->info.ngray_shades = ngray;
940 if (klass->info.nreserved)
942 klass->info.reserved_pixels = g_new (gulong, klass->info.nreserved);
943 if (!gdk_colors_alloc (klass->info.cmap, 0, NULL, 0,
944 klass->info.reserved_pixels,
945 klass->info.nreserved))
947 g_free (klass->info.reserved_pixels);
948 klass->info.reserved_pixels = NULL;
954 gtk_trim_cmap (klass);
957 gtk_create_8_bit (klass);
960 gtk_set_preview_prop (klass->info.nred_shades,
961 klass->info.ngreen_shades,
962 klass->info.nblue_shades,
963 klass->info.ngray_shades);
968 if (klass->info.visual == gdk_visual_get_system ())
969 klass->info.cmap = gdk_colormap_get_system ();
972 klass->info.cmap = gdk_colormap_new (klass->info.visual, FALSE);
973 klass->info.cmap_alloced = TRUE;
976 klass->info.nred_shades = 0;
977 klass->info.ngreen_shades = 0;
978 klass->info.nblue_shades = 0;
979 klass->info.ngray_shades = 0;
984 gtk_preview_dither_init (GtkPreviewClass *klass)
987 unsigned char low_shade, high_shade;
988 unsigned short index;
989 long red_mult, green_mult;
990 double red_matrix_width;
991 double green_matrix_width;
992 double blue_matrix_width;
993 double gray_matrix_width;
994 double red_colors_per_shade;
995 double green_colors_per_shade;
996 double blue_colors_per_shade;
997 double gray_colors_per_shade;
999 gint shades_r, shades_g, shades_b, shades_gray;
1000 GtkDitherInfo *red_ordered_dither;
1001 GtkDitherInfo *green_ordered_dither;
1002 GtkDitherInfo *blue_ordered_dither;
1003 GtkDitherInfo *gray_ordered_dither;
1004 guchar ***dither_matrix;
1007 { 0, 32, 8, 40, 2, 34, 10, 42 },
1008 { 48, 16, 56, 24, 50, 18, 58, 26 },
1009 { 12, 44, 4, 36, 14, 46, 6, 38 },
1010 { 60, 28, 52, 20, 62, 30, 54, 22 },
1011 { 3, 35, 11, 43, 1, 33, 9, 41 },
1012 { 51, 19, 59, 27, 49, 17, 57, 25 },
1013 { 15, 47, 7, 39, 13, 45, 5, 37 },
1014 { 63, 31, 55, 23, 61, 29, 53, 21 }
1017 if (!klass->info.visual || klass->info.visual->type != GDK_VISUAL_PSEUDO_COLOR)
1020 shades_r = klass->info.nred_shades;
1021 shades_g = klass->info.ngreen_shades;
1022 shades_b = klass->info.nblue_shades;
1023 shades_gray = klass->info.ngray_shades;
1025 red_mult = shades_g * shades_b;
1026 green_mult = shades_b;
1028 red_colors_per_shade = 255.0 / (shades_r - 1);
1029 red_matrix_width = red_colors_per_shade / 64;
1031 green_colors_per_shade = 255.0 / (shades_g - 1);
1032 green_matrix_width = green_colors_per_shade / 64;
1034 blue_colors_per_shade = 255.0 / (shades_b - 1);
1035 blue_matrix_width = blue_colors_per_shade / 64;
1037 gray_colors_per_shade = 255.0 / (shades_gray - 1);
1038 gray_matrix_width = gray_colors_per_shade / 64;
1040 /* alloc the ordered dither arrays for accelerated dithering */
1042 klass->info.dither_red = g_new (GtkDitherInfo, 256);
1043 klass->info.dither_green = g_new (GtkDitherInfo, 256);
1044 klass->info.dither_blue = g_new (GtkDitherInfo, 256);
1045 klass->info.dither_gray = g_new (GtkDitherInfo, 256);
1047 red_ordered_dither = klass->info.dither_red;
1048 green_ordered_dither = klass->info.dither_green;
1049 blue_ordered_dither = klass->info.dither_blue;
1050 gray_ordered_dither = klass->info.dither_gray;
1052 dither_matrix = g_new (guchar**, 8);
1053 for (i = 0; i < 8; i++)
1055 dither_matrix[i] = g_new (guchar*, 8);
1056 for (j = 0; j < 8; j++)
1057 dither_matrix[i][j] = g_new (guchar, 65);
1060 klass->info.dither_matrix = dither_matrix;
1062 /* setup the ordered_dither_matrices */
1064 for (i = 0; i < 8; i++)
1065 for (j = 0; j < 8; j++)
1066 for (k = 0; k <= 64; k++)
1067 dither_matrix[i][j][k] = (DM[i][j] < k) ? 1 : 0;
1069 /* setup arrays containing three bytes of information for red, green, & blue */
1070 /* the arrays contain :
1071 * 1st byte: low end shade value
1072 * 2nd byte: high end shade value
1073 * 3rd & 4th bytes: ordered dither matrix index
1076 gray_pixels = klass->info.gray_pixels;
1078 for (i = 0; i < 256; i++)
1081 /* setup the red information */
1083 low_shade = (unsigned char) (i / red_colors_per_shade);
1084 if (low_shade == (shades_r - 1))
1086 high_shade = low_shade + 1;
1088 index = (unsigned short)
1089 (((double) i - low_shade * red_colors_per_shade) /
1092 low_shade *= red_mult;
1093 high_shade *= red_mult;
1095 red_ordered_dither[i].s[1] = index;
1096 red_ordered_dither[i].c[0] = low_shade;
1097 red_ordered_dither[i].c[1] = high_shade;
1101 /* setup the green information */
1103 low_shade = (unsigned char) (i / green_colors_per_shade);
1104 if (low_shade == (shades_g - 1))
1106 high_shade = low_shade + 1;
1108 index = (unsigned short)
1109 (((double) i - low_shade * green_colors_per_shade) /
1110 green_matrix_width);
1112 low_shade *= green_mult;
1113 high_shade *= green_mult;
1115 green_ordered_dither[i].s[1] = index;
1116 green_ordered_dither[i].c[0] = low_shade;
1117 green_ordered_dither[i].c[1] = high_shade;
1121 /* setup the blue information */
1123 low_shade = (unsigned char) (i / blue_colors_per_shade);
1124 if (low_shade == (shades_b - 1))
1126 high_shade = low_shade + 1;
1128 index = (unsigned short)
1129 (((double) i - low_shade * blue_colors_per_shade) /
1132 blue_ordered_dither[i].s[1] = index;
1133 blue_ordered_dither[i].c[0] = low_shade;
1134 blue_ordered_dither[i].c[1] = high_shade;
1138 /* setup the gray information */
1140 low_shade = (unsigned char) (i / gray_colors_per_shade);
1141 if (low_shade == (shades_gray - 1))
1143 high_shade = low_shade + 1;
1145 index = (unsigned short)
1146 (((double) i - low_shade * gray_colors_per_shade) /
1149 gray_ordered_dither[i].s[1] = index;
1150 gray_ordered_dither[i].c[0] = gray_pixels[low_shade];
1151 gray_ordered_dither[i].c[1] = gray_pixels[high_shade];
1157 gtk_fill_lookup_array (gulong *array,
1162 double one_over_gamma;
1167 if (preview_class->info.gamma != 0.0)
1168 one_over_gamma = 1.0 / preview_class->info.gamma;
1170 one_over_gamma = 1.0;
1172 for (i = 0; i < 256; i++)
1174 if (one_over_gamma == 1.0)
1175 array[i] = ((i >> prec) << shift);
1178 ind = (double) i / 255.0;
1179 val = (int) (255 * pow (ind, one_over_gamma));
1180 array[i] = ((val >> prec) << shift);
1186 gtk_trim_cmap (GtkPreviewClass *klass)
1198 nred = klass->info.nred_shades;
1199 ngreen = klass->info.ngreen_shades;
1200 nblue = klass->info.nblue_shades;
1201 ngray = klass->info.ngray_shades;
1202 nreserved = klass->info.nreserved;
1207 total = nred * ngreen * nblue + ngray + nreserved;
1211 if ((nred < 2) || (ngreen < 2) || (nblue < 2) || (ngray < 2))
1215 success = gdk_colors_alloc (klass->info.cmap, 0, NULL, 0, pixels, total);
1220 klass->info.reserved_pixels = g_new (gulong, nreserved);
1221 memcpy (klass->info.reserved_pixels, pixels, sizeof (gulong) * nreserved);
1222 gdk_colors_free (klass->info.cmap, &pixels[nreserved],
1223 total - nreserved, 0);
1227 gdk_colors_free (klass->info.cmap, pixels, total, 0);
1235 if ((nblue >= nred) && (nblue >= ngreen))
1237 else if ((nred >= ngreen) && (nred >= nblue))
1241 tmp = log ((gdouble)ngray) / log (2.0);
1244 ngreen = ngreen - 1;
1251 if ((nred < 2) || (ngreen < 2) || (nblue < 2) || (ngray < 2))
1253 g_print ("Unable to allocate sufficient colormap entries.\n");
1254 g_print ("Try exiting other color intensive applications.\n");
1258 /* If any of the shade values has changed, issue a warning */
1259 if ((nred != klass->info.nred_shades) ||
1260 (ngreen != klass->info.ngreen_shades) ||
1261 (nblue != klass->info.nblue_shades) ||
1262 (ngray != klass->info.ngray_shades))
1264 g_print ("Not enough colors to satisfy requested color cube.\n");
1265 g_print ("Reduced color cube shades from\n");
1266 g_print ("[%d of Red, %d of Green, %d of Blue, %d of Gray] ==> [%d of Red, %d of Green, %d of Blue, %d of Gray]\n",
1267 klass->info.nred_shades, klass->info.ngreen_shades,
1268 klass->info.nblue_shades, klass->info.ngray_shades,
1269 nred, ngreen, nblue, ngray);
1272 klass->info.nred_shades = nred;
1273 klass->info.ngreen_shades = ngreen;
1274 klass->info.nblue_shades = nblue;
1275 klass->info.ngray_shades = ngray;
1279 gtk_create_8_bit (GtkPreviewClass *klass)
1281 unsigned int r, g, b;
1282 unsigned int rv, gv, bv;
1283 unsigned int dr, dg, db, dgray;
1286 double one_over_gamma;
1289 if (!klass->info.color_pixels)
1290 klass->info.color_pixels = g_new (gulong, 256);
1292 if (!klass->info.gray_pixels)
1293 klass->info.gray_pixels = g_new (gulong, 256);
1295 if (klass->info.gamma != 0.0)
1296 one_over_gamma = 1.0 / klass->info.gamma;
1298 one_over_gamma = 1.0;
1300 dr = klass->info.nred_shades - 1;
1301 dg = klass->info.ngreen_shades - 1;
1302 db = klass->info.nblue_shades - 1;
1303 dgray = klass->info.ngray_shades - 1;
1305 pixels = klass->info.color_pixels;
1307 for (r = 0, i = 0; r <= dr; r++)
1308 for (g = 0; g <= dg; g++)
1309 for (b = 0; b <= db; b++, i++)
1311 rv = (unsigned int) ((r * klass->info.visual->colormap_size) / dr);
1312 gv = (unsigned int) ((g * klass->info.visual->colormap_size) / dg);
1313 bv = (unsigned int) ((b * klass->info.visual->colormap_size) / db);
1314 color.red = ((int) (255 * pow ((double) rv / 256.0, one_over_gamma))) * 257;
1315 color.green = ((int) (255 * pow ((double) gv / 256.0, one_over_gamma))) * 257;
1316 color.blue = ((int) (255 * pow ((double) bv / 256.0, one_over_gamma))) * 257;
1318 if (!gdk_color_alloc (klass->info.cmap, &color))
1320 g_error ("could not initialize 8-bit combined colormap");
1324 pixels[i] = color.pixel;
1328 pixels = klass->info.gray_pixels;
1330 for (i = 0; i < (int) klass->info.ngray_shades; i++)
1332 color.red = (i * klass->info.visual->colormap_size) / dgray;
1333 color.red = ((int) (255 * pow ((double) color.red / 256.0, one_over_gamma))) * 257;
1334 color.green = color.red;
1335 color.blue = color.red;
1337 if (!gdk_color_alloc (klass->info.cmap, &color))
1339 g_error ("could not initialize 8-bit combined colormap");
1343 pixels[i] = color.pixel;
1349 gtk_color_8 (guchar *src,
1356 GtkDitherInfo *dither_red;
1357 GtkDitherInfo *dither_green;
1358 GtkDitherInfo *dither_blue;
1359 GtkDitherInfo r, g, b;
1360 guchar **dither_matrix;
1363 colors = preview_class->info.color_pixels;
1364 dither_red = preview_class->info.dither_red;
1365 dither_green = preview_class->info.dither_green;
1366 dither_blue = preview_class->info.dither_blue;
1367 dither_matrix = preview_class->info.dither_matrix[y & 0x7];
1371 r = dither_red[src[0]];
1372 g = dither_green[src[1]];
1373 b = dither_blue[src[2]];
1376 matrix = dither_matrix[x++ & 0x7];
1377 *dest++ = colors[(r.c[matrix[r.s[1]]] +
1378 g.c[matrix[g.s[1]]] +
1379 b.c[matrix[b.s[1]]])];
1384 gtk_color_16 (guchar *src,
1389 gulong *lookup_green;
1390 gulong *lookup_blue;
1393 lookup_red = preview_class->info.lookup_red;
1394 lookup_green = preview_class->info.lookup_green;
1395 lookup_blue = preview_class->info.lookup_blue;
1399 val = COLOR_COMPOSE (src[0], src[1], src[2]);
1408 gtk_color_24 (guchar *src,
1413 gulong *lookup_green;
1414 gulong *lookup_blue;
1417 lookup_red = preview_class->info.lookup_red;
1418 lookup_green = preview_class->info.lookup_green;
1419 lookup_blue = preview_class->info.lookup_blue;
1423 val = COLOR_COMPOSE (src[0], src[1], src[2]);
1426 dest[2] = val >> 16;
1433 gtk_grayscale_8 (guchar *src,
1439 GtkDitherInfo *dither_gray;
1441 guchar **dither_matrix;
1444 dither_gray = preview_class->info.dither_gray;
1445 dither_matrix = preview_class->info.dither_matrix[y & 0x7];
1449 gray = dither_gray[*src++];
1450 matrix = dither_matrix[x++ & 0x7];
1451 *dest++ = gray.c[matrix[gray.s[1]]];
1456 gtk_grayscale_16 (guchar *src,
1461 gulong *lookup_green;
1462 gulong *lookup_blue;
1465 lookup_red = preview_class->info.lookup_red;
1466 lookup_green = preview_class->info.lookup_green;
1467 lookup_blue = preview_class->info.lookup_blue;
1471 val = COLOR_COMPOSE (*src, *src, *src);
1480 gtk_grayscale_24 (guchar *src,
1485 gulong *lookup_green;
1486 gulong *lookup_blue;
1489 lookup_red = preview_class->info.lookup_red;
1490 lookup_green = preview_class->info.lookup_green;
1491 lookup_blue = preview_class->info.lookup_blue;
1495 val = COLOR_COMPOSE (*src, *src, *src);
1498 dest[2] = val >> 16;
1506 gtk_get_preview_prop (guint *nred,
1511 GtkPreviewProp *prop;
1514 /* FIXME: need to grab the server here to prevent a race condition */
1516 property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE);
1518 if (gdk_property_get (NULL, property, property,
1519 0, sizeof (GtkPreviewProp), FALSE,
1520 NULL, NULL, NULL, (guchar**) &prop))
1522 *nred = prop->nred_shades;
1523 *ngreen = prop->ngreen_shades;
1524 *nblue = prop->nblue_shades;
1525 *ngray = prop->ngray_shades;
1527 prop->ref_count = prop->ref_count + 1;
1528 gdk_property_change (NULL, property, property, 16,
1529 GDK_PROP_MODE_REPLACE,
1539 gtk_set_preview_prop (guint nred,
1544 GtkPreviewProp prop;
1547 property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE);
1550 prop.nred_shades = nred;
1551 prop.ngreen_shades = ngreen;
1552 prop.nblue_shades = nblue;
1553 prop.ngray_shades = ngray;
1555 gdk_property_change (NULL, property, property, 16,
1556 GDK_PROP_MODE_REPLACE,
1557 (guchar*) &prop, 5);
1562 gtk_lsbmsb_1_1 (guchar *dest,
1566 memcpy (dest, src, count);
1570 gtk_lsb_2_2 (guchar *dest,
1574 memcpy (dest, src, count * 2);
1578 gtk_msb_2_2 (guchar *dest,
1592 gtk_lsb_3_3 (guchar *dest,
1596 memcpy (dest, src, count * 3);
1600 gtk_msb_3_3 (guchar *dest,
1615 gtk_lsb_3_4 (guchar *dest,
1630 gtk_msb_3_4 (guchar *dest,