/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include "gdk/gdkx.h" #include "gtkpreview.h" #include "gtksignal.h" #define IMAGE_SIZE 256 #define PREVIEW_CLASS(w) GTK_PREVIEW_CLASS (GTK_OBJECT (w)->klass) #define COLOR_COMPOSE(r,g,b) (lookup_red[r] | lookup_green[g] | lookup_blue[b]) typedef struct _GtkPreviewProp GtkPreviewProp; typedef void (*GtkTransferFunc) (guchar *dest, guchar *src, gint count); struct _GtkPreviewProp { guint16 ref_count; guint16 nred_shades; guint16 ngreen_shades; guint16 nblue_shades; guint16 ngray_shades; }; static void gtk_preview_class_init (GtkPreviewClass *klass); static void gtk_preview_init (GtkPreview *preview); static void gtk_preview_destroy (GtkObject *object); static void gtk_preview_realize (GtkWidget *widget); static void gtk_preview_unrealize (GtkWidget *widget); static gint gtk_preview_expose (GtkWidget *widget, GdkEventExpose *event); static void gtk_preview_make_buffer (GtkPreview *preview); static void gtk_preview_get_visuals (GtkPreviewClass *klass); static void gtk_preview_get_cmaps (GtkPreviewClass *klass); static void gtk_preview_dither_init (GtkPreviewClass *klass); static void gtk_fill_lookup_array (gulong *array, int depth, int shift, int prec); static void gtk_trim_cmap (GtkPreviewClass *klass); static void gtk_create_8_bit (GtkPreviewClass *klass); static void gtk_color_8 (guchar *src, guchar *data, gint x, gint y, gulong width); static void gtk_color_16 (guchar *src, guchar *data, gulong width); static void gtk_color_24 (guchar *src, guchar *data, gulong width); static void gtk_grayscale_8 (guchar *src, guchar *data, gint x, gint y, gulong width); static void gtk_grayscale_16 (guchar *src, guchar *data, gulong width); static void gtk_grayscale_24 (guchar *src, guchar *data, gulong width); static gint gtk_get_preview_prop (guint *nred, guint *nblue, guint *ngreen, guint *ngray); static void gtk_set_preview_prop (guint nred, guint ngreen, guint nblue, guint ngray); /* transfer functions: * destination byte order/source bpp/destination bpp */ static void gtk_lsbmsb_1_1 (guchar *dest, guchar *src, gint count); static void gtk_lsb_2_2 (guchar *dest, guchar *src, gint count); static void gtk_msb_2_2 (guchar *dest, guchar *src, gint count); static void gtk_lsb_3_3 (guchar *dest, guchar *src, gint count); static void gtk_msb_3_3 (guchar *dest, guchar *src, gint count); static void gtk_lsb_3_4 (guchar *dest, guchar *src, gint count); static void gtk_msb_3_4 (guchar *dest, guchar *src, gint count); static GtkWidgetClass *parent_class = NULL; static GtkPreviewClass *preview_class = NULL; static GtkPreviewInfo *preview_info = NULL; static gint install_cmap = FALSE; guint gtk_preview_get_type () { static guint preview_type = 0; if (!preview_type) { GtkTypeInfo preview_info = { "GtkPreview", sizeof (GtkPreview), sizeof (GtkPreviewClass), (GtkClassInitFunc) gtk_preview_class_init, (GtkObjectInitFunc) gtk_preview_init, (GtkArgSetFunc) NULL, (GtkArgGetFunc) NULL, }; preview_type = gtk_type_unique (gtk_widget_get_type (), &preview_info); } return preview_type; } static void gtk_preview_class_init (GtkPreviewClass *klass) { GtkObjectClass *object_class; GtkWidgetClass *widget_class; object_class = (GtkObjectClass*) klass; widget_class = (GtkWidgetClass*) klass; parent_class = gtk_type_class (gtk_widget_get_type ()); preview_class = klass; object_class->destroy = gtk_preview_destroy; widget_class->realize = gtk_preview_realize; widget_class->unrealize = gtk_preview_unrealize; widget_class->expose_event = gtk_preview_expose; if (preview_info) klass->info = *preview_info; else { klass->info.visual = NULL; klass->info.cmap = NULL; klass->info.color_pixels = NULL; klass->info.gray_pixels = NULL; klass->info.reserved_pixels = NULL; klass->info.lookup_red = NULL; klass->info.lookup_green = NULL; klass->info.lookup_blue = NULL; klass->info.dither_red = NULL; klass->info.dither_green = NULL; klass->info.dither_blue = NULL; klass->info.dither_gray = NULL; klass->info.dither_matrix = NULL; klass->info.nred_shades = 6; klass->info.ngreen_shades = 6; klass->info.nblue_shades = 4; klass->info.ngray_shades = 24; klass->info.nreserved = 0; klass->info.bpp = 0; klass->info.cmap_alloced = FALSE; klass->info.gamma = 1.0; } klass->image = NULL; gtk_preview_get_visuals (klass); gtk_preview_get_cmaps (klass); gtk_preview_dither_init (klass); } static void gtk_preview_init (GtkPreview *preview) { GTK_WIDGET_SET_FLAGS (preview, GTK_BASIC); preview->buffer = NULL; preview->buffer_width = 0; preview->buffer_height = 0; preview->expand = FALSE; } void gtk_preview_uninit () { GtkPreviewProp *prop; GdkAtom property; if (preview_class && !install_cmap && (preview_class->info.visual->type != GDK_VISUAL_TRUE_COLOR) && (preview_class->info.visual->type != GDK_VISUAL_DIRECT_COLOR)) { property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE); if (gdk_property_get (NULL, property, property, 0, sizeof (GtkPreviewProp), FALSE, NULL, NULL, NULL, (guchar**) &prop)) { prop->ref_count = ntohs (prop->ref_count) - 1; if (prop->ref_count == 0) { gdk_property_delete (NULL, property); } else { prop->ref_count = htons (prop->ref_count); gdk_property_change (NULL, property, property, 16, GDK_PROP_MODE_REPLACE, (guchar*) prop, 5); } } } } GtkWidget* gtk_preview_new (GtkPreviewType type) { GtkPreview *preview; preview = gtk_type_new (gtk_preview_get_type ()); preview->type = type; return GTK_WIDGET (preview); } void gtk_preview_size (GtkPreview *preview, gint width, gint height) { g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); if ((width != GTK_WIDGET (preview)->requisition.width) || (height != GTK_WIDGET (preview)->requisition.height)) { GTK_WIDGET (preview)->requisition.width = width; GTK_WIDGET (preview)->requisition.height = height; if (preview->buffer) g_free (preview->buffer); preview->buffer = NULL; } } void gtk_preview_put (GtkPreview *preview, GdkWindow *window, GdkGC *gc, gint srcx, gint srcy, gint destx, gint desty, gint width, gint height) { GtkWidget *widget; GdkImage *image; GdkRectangle r1, r2, r3; GtkTransferFunc transfer_func; guchar *image_mem; guchar *src, *dest; gint x, xe, x2; gint y, ye, y2; guint dest_rowstride; guint src_bpp; guint dest_bpp; gint i; g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); g_return_if_fail (window != NULL); if (!preview->buffer) return; widget = GTK_WIDGET (preview); r1.x = srcx; r1.y = srcy; r1.width = preview->buffer_width; r1.height = preview->buffer_height; r2.x = destx; r2.y = desty; r2.width = width; r2.height = height; if (!gdk_rectangle_intersect (&r1, &r2, &r3)) return; x2 = r3.x + r3.width; y2 = r3.y + r3.height; if (!preview_class->image) preview_class->image = gdk_image_new (GDK_IMAGE_FASTEST, preview_class->info.visual, IMAGE_SIZE, IMAGE_SIZE); image = preview_class->image; src_bpp = preview_class->info.bpp; image_mem = image->mem; dest_bpp = image->bpp; dest_rowstride = image->bpl; transfer_func = NULL; switch (dest_bpp) { case 1: switch (src_bpp) { case 1: transfer_func = gtk_lsbmsb_1_1; break; } break; case 2: switch (src_bpp) { case 2: if (image->byte_order == GDK_MSB_FIRST) transfer_func = gtk_msb_2_2; else transfer_func = gtk_lsb_2_2; break; case 3: break; } break; case 3: switch (src_bpp) { case 3: if (image->byte_order == GDK_MSB_FIRST) transfer_func = gtk_msb_3_3; else transfer_func = gtk_lsb_3_3; break; } break; case 4: switch (src_bpp) { case 3: if (image->byte_order == GDK_MSB_FIRST) transfer_func = gtk_msb_3_4; else transfer_func = gtk_lsb_3_4; break; } break; } if (!transfer_func) { g_warning ("unsupported byte order/src bpp/dest bpp combination: %s:%d:%d", (image->byte_order == GDK_MSB_FIRST) ? "msb" : "lsb", src_bpp, dest_bpp); return; } for (y = r3.y; y < y2; y += IMAGE_SIZE) { for (x = r3.x; x < x2; x += IMAGE_SIZE) { xe = x + IMAGE_SIZE; if (xe > x2) xe = x2; ye = y + IMAGE_SIZE; if (ye > y2) ye = y2; for (i = y; i < ye; i++) { src = preview->buffer + (((gulong) (i - r1.y) * (gulong) preview->buffer_width) + (x - r1.x)) * (gulong) src_bpp; dest = image_mem + ((gulong) (i - y) * dest_rowstride); if (xe > x) (* transfer_func) (dest, src, xe - x); } gdk_draw_image (window, gc, image, 0, 0, x, y, xe - x, ye - y); gdk_flush (); } } } void gtk_preview_put_row (GtkPreview *preview, guchar *src, guchar *dest, gint x, gint y, gint w) { g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); g_return_if_fail (src != NULL); g_return_if_fail (dest != NULL); switch (preview->type) { case GTK_PREVIEW_COLOR: switch (preview_class->info.visual->depth) { case 8: gtk_color_8 (src, dest, x, y, w); break; case 15: case 16: gtk_color_16 (src, dest, w); break; case 24: case 32: gtk_color_24 (src, dest, w); break; } break; case GTK_PREVIEW_GRAYSCALE: switch (preview_class->info.visual->depth) { case 8: gtk_grayscale_8 (src, dest, x, y, w); break; case 15: case 16: gtk_grayscale_16 (src, dest, w); break; case 24: case 32: gtk_grayscale_24 (src, dest, w); break; } break; } } void gtk_preview_draw_row (GtkPreview *preview, guchar *data, gint x, gint y, gint w) { guchar *dest; g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); g_return_if_fail (data != NULL); if ((w <= 0) || (y < 0)) return; g_return_if_fail (data != NULL); gtk_preview_make_buffer (preview); if (y >= preview->buffer_height) return; switch (preview->type) { case GTK_PREVIEW_COLOR: switch (preview_class->info.visual->depth) { case 8: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x); gtk_color_8 (data, dest, x, y, w); break; case 15: case 16: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 2; gtk_color_16 (data, dest, w); break; case 24: case 32: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 3; gtk_color_24 (data, dest, w); break; } break; case GTK_PREVIEW_GRAYSCALE: switch (preview_class->info.visual->depth) { case 8: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x); gtk_grayscale_8 (data, dest, x, y, w); break; case 15: case 16: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 2; gtk_grayscale_16 (data, dest, w); break; case 24: case 32: dest = preview->buffer + ((gulong) y * (gulong) preview->buffer_width + (gulong) x) * 3; gtk_grayscale_24 (data, dest, w); break; } break; } } void gtk_preview_set_expand (GtkPreview *preview, gint expand) { g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); preview->expand = (expand != FALSE); } void gtk_preview_set_gamma (double _gamma) { g_return_if_fail (preview_class == NULL); if (!preview_info) { preview_info = g_new0 (GtkPreviewInfo, 1); preview_info->nred_shades = 6; preview_info->ngreen_shades = 6; preview_info->nblue_shades = 4; preview_info->ngray_shades = 24; } preview_info->gamma = _gamma; } void gtk_preview_set_color_cube (guint nred_shades, guint ngreen_shades, guint nblue_shades, guint ngray_shades) { g_return_if_fail (preview_class == NULL); if (!preview_info) { preview_info = g_new0 (GtkPreviewInfo, 1); preview_info->gamma = 1.0; } preview_info->nred_shades = nred_shades; preview_info->ngreen_shades = ngreen_shades; preview_info->nblue_shades = nblue_shades; preview_info->ngray_shades = ngray_shades; } void gtk_preview_set_install_cmap (gint _install_cmap) { /* g_return_if_fail (preview_class == NULL); */ install_cmap = _install_cmap; } void gtk_preview_set_reserved (gint nreserved) { if (!preview_info) preview_info = g_new0 (GtkPreviewInfo, 1); preview_info->nreserved = nreserved; } GdkVisual* gtk_preview_get_visual () { if (!preview_class) preview_class = gtk_type_class (gtk_preview_get_type ()); return preview_class->info.visual; } GdkColormap* gtk_preview_get_cmap () { if (!preview_class) preview_class = gtk_type_class (gtk_preview_get_type ()); return preview_class->info.cmap; } GtkPreviewInfo* gtk_preview_get_info () { if (!preview_class) preview_class = gtk_type_class (gtk_preview_get_type ()); return &preview_class->info; } static void gtk_preview_destroy (GtkObject *object) { GtkPreview *preview; g_return_if_fail (object != NULL); g_return_if_fail (GTK_IS_PREVIEW (object)); preview = GTK_PREVIEW (object); if (preview->buffer) g_free (preview->buffer); preview->type = (GtkPreviewType) -1; if (GTK_OBJECT_CLASS (parent_class)->destroy) (* GTK_OBJECT_CLASS (parent_class)->destroy) (object); } static void gtk_preview_realize (GtkWidget *widget) { GtkPreview *preview; GdkWindowAttr attributes; gint attributes_mask; g_return_if_fail (widget != NULL); g_return_if_fail (GTK_IS_PREVIEW (widget)); GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED); preview = GTK_PREVIEW (widget); attributes.window_type = GDK_WINDOW_CHILD; attributes.x = widget->allocation.x; attributes.y = widget->allocation.y; attributes.width = widget->allocation.width; attributes.height = widget->allocation.height; attributes.wclass = GDK_INPUT_OUTPUT; attributes.visual = gtk_widget_get_visual (widget); attributes.colormap = gtk_widget_get_colormap (widget); attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK; attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP; widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask); gdk_window_set_user_data (widget->window, widget); widget->style = gtk_style_attach (widget->style, widget->window); gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL); } static void gtk_preview_unrealize (GtkWidget *widget) { GtkPreview *preview; g_return_if_fail (widget != NULL); g_return_if_fail (GTK_IS_PREVIEW (widget)); preview = GTK_PREVIEW (widget); if (GTK_WIDGET_CLASS (parent_class)->unrealize) (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget); } static gint gtk_preview_expose (GtkWidget *widget, GdkEventExpose *event) { GtkPreview *preview; g_return_val_if_fail (widget != NULL, FALSE); g_return_val_if_fail (GTK_IS_PREVIEW (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); if (GTK_WIDGET_DRAWABLE (widget)) { preview = GTK_PREVIEW (widget); gtk_preview_put (GTK_PREVIEW (widget), widget->window, widget->style->black_gc, (widget->allocation.width - preview->buffer_width) / 2, (widget->allocation.height - preview->buffer_height) / 2, event->area.x, event->area.y, event->area.width, event->area.height); } return FALSE; } static void gtk_preview_make_buffer (GtkPreview *preview) { GtkWidget *widget; gint width; gint height; g_return_if_fail (preview != NULL); g_return_if_fail (GTK_IS_PREVIEW (preview)); widget = GTK_WIDGET (preview); if (preview->expand && (widget->allocation.width != 0) && (widget->allocation.height != 0)) { width = widget->allocation.width; height = widget->allocation.height; } else { width = widget->requisition.width; height = widget->requisition.height; } if (!preview->buffer || (preview->buffer_width != width) || (preview->buffer_height != height)) { if (preview->buffer) g_free (preview->buffer); preview->buffer_width = width; preview->buffer_height = height; preview->buffer = g_new0 (guchar, preview->buffer_width * preview->buffer_height * preview_class->info.bpp); } } static void gtk_preview_get_visuals (GtkPreviewClass *klass) { static GdkVisualType types[] = { GDK_VISUAL_TRUE_COLOR, GDK_VISUAL_DIRECT_COLOR, GDK_VISUAL_TRUE_COLOR, GDK_VISUAL_DIRECT_COLOR, GDK_VISUAL_TRUE_COLOR, GDK_VISUAL_DIRECT_COLOR, GDK_VISUAL_TRUE_COLOR, GDK_VISUAL_DIRECT_COLOR, GDK_VISUAL_PSEUDO_COLOR }; static gint depths[] = { 24, 24, 32, 32, 16, 16, 15, 15, 8 }; static gint nvisual_types = sizeof (types) / sizeof (types[0]); int i; g_return_if_fail (klass != NULL); if (!klass->info.visual) for (i = 0; i < nvisual_types; i++) if ((klass->info.visual = gdk_visual_get_best_with_both (depths[i], types[i]))) { if ((klass->info.visual->type == GDK_VISUAL_TRUE_COLOR) || (klass->info.visual->type == GDK_VISUAL_DIRECT_COLOR)) { klass->info.lookup_red = g_new (gulong, 256); klass->info.lookup_green = g_new (gulong, 256); klass->info.lookup_blue = g_new (gulong, 256); gtk_fill_lookup_array (klass->info.lookup_red, klass->info.visual->depth, klass->info.visual->red_shift, 8 - klass->info.visual->red_prec); gtk_fill_lookup_array (klass->info.lookup_green, klass->info.visual->depth, klass->info.visual->green_shift, 8 - klass->info.visual->green_prec); gtk_fill_lookup_array (klass->info.lookup_blue, klass->info.visual->depth, klass->info.visual->blue_shift, 8 - klass->info.visual->blue_prec); } break; } if (!klass->info.visual) { g_warning ("unable to find a suitable visual for color image display.\n"); return; } switch (klass->info.visual->depth) { case 8: klass->info.bpp = 1; break; case 15: case 16: klass->info.bpp = 2; break; case 24: case 32: klass->info.bpp = 3; break; } } static void gtk_preview_get_cmaps (GtkPreviewClass *klass) { g_return_if_fail (klass != NULL); g_return_if_fail (klass->info.visual != NULL); if ((klass->info.visual->type != GDK_VISUAL_TRUE_COLOR) && (klass->info.visual->type != GDK_VISUAL_DIRECT_COLOR)) { if (install_cmap) { klass->info.cmap = gdk_colormap_new (klass->info.visual, FALSE); klass->info.cmap_alloced = install_cmap; gtk_trim_cmap (klass); gtk_create_8_bit (klass); } else { guint nred; guint ngreen; guint nblue; guint ngray; gint set_prop; klass->info.cmap = gdk_colormap_get_system (); set_prop = TRUE; if (gtk_get_preview_prop (&nred, &ngreen, &nblue, &ngray)) { set_prop = FALSE; klass->info.nred_shades = nred; klass->info.ngreen_shades = ngreen; klass->info.nblue_shades = nblue; klass->info.ngray_shades = ngray; if (klass->info.nreserved) { klass->info.reserved_pixels = g_new (gulong, klass->info.nreserved); if (!gdk_colors_alloc (klass->info.cmap, 0, NULL, 0, klass->info.reserved_pixels, klass->info.nreserved)) { g_free (klass->info.reserved_pixels); klass->info.reserved_pixels = NULL; } } } else { gtk_trim_cmap (klass); } gtk_create_8_bit (klass); if (set_prop) gtk_set_preview_prop (klass->info.nred_shades, klass->info.ngreen_shades, klass->info.nblue_shades, klass->info.ngray_shades); } } else { if (klass->info.visual == gdk_visual_get_system ()) klass->info.cmap = gdk_colormap_get_system (); else klass->info.cmap = gdk_colormap_new (klass->info.visual, FALSE); klass->info.cmap_alloced = TRUE; klass->info.nred_shades = 0; klass->info.ngreen_shades = 0; klass->info.nblue_shades = 0; klass->info.ngray_shades = 0; } } static void gtk_preview_dither_init (GtkPreviewClass *klass) { int i, j, k; unsigned char low_shade, high_shade; unsigned short index; long red_mult, green_mult; double red_matrix_width; double green_matrix_width; double blue_matrix_width; double gray_matrix_width; double red_colors_per_shade; double green_colors_per_shade; double blue_colors_per_shade; double gray_colors_per_shade; gulong *gray_pixels; gint shades_r, shades_g, shades_b, shades_gray; GtkDitherInfo *red_ordered_dither; GtkDitherInfo *green_ordered_dither; GtkDitherInfo *blue_ordered_dither; GtkDitherInfo *gray_ordered_dither; guchar ***dither_matrix; guchar DM[8][8] = { { 0, 32, 8, 40, 2, 34, 10, 42 }, { 48, 16, 56, 24, 50, 18, 58, 26 }, { 12, 44, 4, 36, 14, 46, 6, 38 }, { 60, 28, 52, 20, 62, 30, 54, 22 }, { 3, 35, 11, 43, 1, 33, 9, 41 }, { 51, 19, 59, 27, 49, 17, 57, 25 }, { 15, 47, 7, 39, 13, 45, 5, 37 }, { 63, 31, 55, 23, 61, 29, 53, 21 } }; if (klass->info.visual->type != GDK_VISUAL_PSEUDO_COLOR) return; shades_r = klass->info.nred_shades; shades_g = klass->info.ngreen_shades; shades_b = klass->info.nblue_shades; shades_gray = klass->info.ngray_shades; red_mult = shades_g * shades_b; green_mult = shades_b; red_colors_per_shade = 255.0 / (shades_r - 1); red_matrix_width = red_colors_per_shade / 64; green_colors_per_shade = 255.0 / (shades_g - 1); green_matrix_width = green_colors_per_shade / 64; blue_colors_per_shade = 255.0 / (shades_b - 1); blue_matrix_width = blue_colors_per_shade / 64; gray_colors_per_shade = 255.0 / (shades_gray - 1); gray_matrix_width = gray_colors_per_shade / 64; /* alloc the ordered dither arrays for accelerated dithering */ klass->info.dither_red = g_new (GtkDitherInfo, 256); klass->info.dither_green = g_new (GtkDitherInfo, 256); klass->info.dither_blue = g_new (GtkDitherInfo, 256); klass->info.dither_gray = g_new (GtkDitherInfo, 256); red_ordered_dither = klass->info.dither_red; green_ordered_dither = klass->info.dither_green; blue_ordered_dither = klass->info.dither_blue; gray_ordered_dither = klass->info.dither_gray; dither_matrix = g_new (guchar**, 8); for (i = 0; i < 8; i++) { dither_matrix[i] = g_new (guchar*, 8); for (j = 0; j < 8; j++) dither_matrix[i][j] = g_new (guchar, 65); } klass->info.dither_matrix = dither_matrix; /* setup the ordered_dither_matrices */ for (i = 0; i < 8; i++) for (j = 0; j < 8; j++) for (k = 0; k <= 64; k++) dither_matrix[i][j][k] = (DM[i][j] < k) ? 1 : 0; /* setup arrays containing three bytes of information for red, green, & blue */ /* the arrays contain : * 1st byte: low end shade value * 2nd byte: high end shade value * 3rd & 4th bytes: ordered dither matrix index */ gray_pixels = klass->info.gray_pixels; for (i = 0; i < 256; i++) { /* setup the red information */ { low_shade = (unsigned char) (i / red_colors_per_shade); if (low_shade == (shades_r - 1)) low_shade--; high_shade = low_shade + 1; index = (unsigned short) (((double) i - low_shade * red_colors_per_shade) / red_matrix_width); low_shade *= red_mult; high_shade *= red_mult; red_ordered_dither[i].s[1] = index; red_ordered_dither[i].c[0] = low_shade; red_ordered_dither[i].c[1] = high_shade; } /* setup the green information */ { low_shade = (unsigned char) (i / green_colors_per_shade); if (low_shade == (shades_g - 1)) low_shade--; high_shade = low_shade + 1; index = (unsigned short) (((double) i - low_shade * green_colors_per_shade) / green_matrix_width); low_shade *= green_mult; high_shade *= green_mult; green_ordered_dither[i].s[1] = index; green_ordered_dither[i].c[0] = low_shade; green_ordered_dither[i].c[1] = high_shade; } /* setup the blue information */ { low_shade = (unsigned char) (i / blue_colors_per_shade); if (low_shade == (shades_b - 1)) low_shade--; high_shade = low_shade + 1; index = (unsigned short) (((double) i - low_shade * blue_colors_per_shade) / blue_matrix_width); blue_ordered_dither[i].s[1] = index; blue_ordered_dither[i].c[0] = low_shade; blue_ordered_dither[i].c[1] = high_shade; } /* setup the gray information */ { low_shade = (unsigned char) (i / gray_colors_per_shade); if (low_shade == (shades_gray - 1)) low_shade--; high_shade = low_shade + 1; index = (unsigned short) (((double) i - low_shade * gray_colors_per_shade) / gray_matrix_width); gray_ordered_dither[i].s[1] = index; gray_ordered_dither[i].c[0] = gray_pixels[low_shade]; gray_ordered_dither[i].c[1] = gray_pixels[high_shade]; } } } static void gtk_fill_lookup_array (gulong *array, int depth, int shift, int prec) { double one_over_gamma; double ind; int val; int i; if (preview_class->info.gamma != 0.0) one_over_gamma = 1.0 / preview_class->info.gamma; else one_over_gamma = 1.0; for (i = 0; i < 256; i++) { if (one_over_gamma == 1.0) array[i] = ((i >> prec) << shift); else { ind = (double) i / 255.0; val = (int) (255 * pow (ind, one_over_gamma)); array[i] = ((val >> prec) << shift); } } } static void gtk_trim_cmap (GtkPreviewClass *klass) { gulong pixels[256]; guint nred; guint ngreen; guint nblue; guint ngray; guint nreserved; guint total; guint tmp; gint success; nred = klass->info.nred_shades; ngreen = klass->info.ngreen_shades; nblue = klass->info.nblue_shades; ngray = klass->info.ngray_shades; nreserved = klass->info.nreserved; success = FALSE; while (!success) { total = nred * ngreen * nblue + ngray + nreserved; if (total <= 256) { if ((nred < 2) || (ngreen < 2) || (nblue < 2) || (ngray < 2)) success = TRUE; else { success = gdk_colors_alloc (klass->info.cmap, 0, NULL, 0, pixels, total); if (success) { if (nreserved > 0) { klass->info.reserved_pixels = g_new (gulong, nreserved); memcpy (klass->info.reserved_pixels, pixels, sizeof (gulong) * nreserved); gdk_colors_free (klass->info.cmap, &pixels[nreserved], total - nreserved, 0); } else { gdk_colors_free (klass->info.cmap, pixels, total, 0); } } } } if (!success) { if ((nblue >= nred) && (nblue >= ngreen)) nblue = nblue - 1; else if ((nred >= ngreen) && (nred >= nblue)) nred = nred - 1; else { tmp = log (ngray) / log (2); if (ngreen >= tmp) ngreen = ngreen - 1; else ngray -= 1; } } } if ((nred < 2) || (ngreen < 2) || (nblue < 2) || (ngray < 2)) { g_print ("Unable to allocate sufficient colormap entries.\n"); g_print ("Try exiting other color intensive applications.\n"); return; } /* If any of the shade values has changed, issue a warning */ if ((nred != klass->info.nred_shades) || (ngreen != klass->info.ngreen_shades) || (nblue != klass->info.nblue_shades) || (ngray != klass->info.ngray_shades)) { g_print ("Not enough colors to satisfy requested color cube.\n"); g_print ("Reduced color cube shades from\n"); 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", klass->info.nred_shades, klass->info.ngreen_shades, klass->info.nblue_shades, klass->info.ngray_shades, nred, ngreen, nblue, ngray); } klass->info.nred_shades = nred; klass->info.ngreen_shades = ngreen; klass->info.nblue_shades = nblue; klass->info.ngray_shades = ngray; } static void gtk_create_8_bit (GtkPreviewClass *klass) { unsigned int r, g, b; unsigned int rv, gv, bv; unsigned int dr, dg, db, dgray; GdkColor color; gulong *pixels; double one_over_gamma; int i; if (!klass->info.color_pixels) klass->info.color_pixels = g_new (gulong, 256); if (!klass->info.gray_pixels) klass->info.gray_pixels = g_new (gulong, 256); if (klass->info.gamma != 0.0) one_over_gamma = 1.0 / klass->info.gamma; else one_over_gamma = 1.0; dr = klass->info.nred_shades - 1; dg = klass->info.ngreen_shades - 1; db = klass->info.nblue_shades - 1; dgray = klass->info.ngray_shades - 1; pixels = klass->info.color_pixels; for (r = 0, i = 0; r <= dr; r++) for (g = 0; g <= dg; g++) for (b = 0; b <= db; b++, i++) { rv = (unsigned int) ((r * klass->info.visual->colormap_size) / dr); gv = (unsigned int) ((g * klass->info.visual->colormap_size) / dg); bv = (unsigned int) ((b * klass->info.visual->colormap_size) / db); color.red = ((int) (255 * pow ((double) rv / 256.0, one_over_gamma))) * 257; color.green = ((int) (255 * pow ((double) gv / 256.0, one_over_gamma))) * 257; color.blue = ((int) (255 * pow ((double) bv / 256.0, one_over_gamma))) * 257; if (!gdk_color_alloc (klass->info.cmap, &color)) { g_error ("could not initialize 8-bit combined colormap"); return; } pixels[i] = color.pixel; } pixels = klass->info.gray_pixels; for (i = 0; i < (int) klass->info.ngray_shades; i++) { color.red = (i * klass->info.visual->colormap_size) / dgray; color.red = ((int) (255 * pow ((double) color.red / 256.0, one_over_gamma))) * 257; color.green = color.red; color.blue = color.red; if (!gdk_color_alloc (klass->info.cmap, &color)) { g_error ("could not initialize 8-bit combined colormap"); return; } pixels[i] = color.pixel; } } static void gtk_color_8 (guchar *src, guchar *dest, gint x, gint y, gulong width) { gulong *colors; GtkDitherInfo *dither_red; GtkDitherInfo *dither_green; GtkDitherInfo *dither_blue; GtkDitherInfo r, g, b; guchar **dither_matrix; guchar *matrix; colors = preview_class->info.color_pixels; dither_red = preview_class->info.dither_red; dither_green = preview_class->info.dither_green; dither_blue = preview_class->info.dither_blue; dither_matrix = preview_class->info.dither_matrix[y & 0x7]; while (width--) { r = dither_red[src[0]]; g = dither_green[src[1]]; b = dither_blue[src[2]]; src += 3; matrix = dither_matrix[x++ & 0x7]; *dest++ = colors[(r.c[matrix[r.s[1]]] + g.c[matrix[g.s[1]]] + b.c[matrix[b.s[1]]])]; } } static void gtk_color_16 (guchar *src, guchar *dest, gulong width) { gulong *lookup_red; gulong *lookup_green; gulong *lookup_blue; gulong val; lookup_red = preview_class->info.lookup_red; lookup_green = preview_class->info.lookup_green; lookup_blue = preview_class->info.lookup_blue; while (width--) { val = COLOR_COMPOSE (src[0], src[1], src[2]); dest[0] = val; dest[1] = val >> 8; dest += 2; src += 3; } } static void gtk_color_24 (guchar *src, guchar *dest, gulong width) { gulong *lookup_red; gulong *lookup_green; gulong *lookup_blue; gulong val; lookup_red = preview_class->info.lookup_red; lookup_green = preview_class->info.lookup_green; lookup_blue = preview_class->info.lookup_blue; while (width--) { val = COLOR_COMPOSE (src[0], src[1], src[2]); dest[0] = val; dest[1] = val >> 8; dest[2] = val >> 16; dest += 3; src += 3; } } static void gtk_grayscale_8 (guchar *src, guchar *dest, gint x, gint y, gulong width) { GtkDitherInfo *dither_gray; GtkDitherInfo gray; guchar **dither_matrix; guchar *matrix; dither_gray = preview_class->info.dither_gray; dither_matrix = preview_class->info.dither_matrix[y & 0x7]; while (width--) { gray = dither_gray[*src++]; matrix = dither_matrix[x++ & 0x7]; *dest++ = gray.c[matrix[gray.s[1]]]; } } static void gtk_grayscale_16 (guchar *src, guchar *dest, gulong width) { gulong *lookup_red; gulong *lookup_green; gulong *lookup_blue; gulong val; lookup_red = preview_class->info.lookup_red; lookup_green = preview_class->info.lookup_green; lookup_blue = preview_class->info.lookup_blue; while (width--) { val = COLOR_COMPOSE (*src, *src, *src); dest[0] = val; dest[1] = val >> 8; dest += 2; src += 1; } } static void gtk_grayscale_24 (guchar *src, guchar *dest, gulong width) { gulong *lookup_red; gulong *lookup_green; gulong *lookup_blue; gulong val; lookup_red = preview_class->info.lookup_red; lookup_green = preview_class->info.lookup_green; lookup_blue = preview_class->info.lookup_blue; while (width--) { val = COLOR_COMPOSE (*src, *src, *src); dest[0] = val; dest[1] = val >> 8; dest[2] = val >> 16; dest += 3; src += 1; } } static gint gtk_get_preview_prop (guint *nred, guint *ngreen, guint *nblue, guint *ngray) { GtkPreviewProp *prop; GdkAtom property; property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE); if (gdk_property_get (NULL, property, property, 0, sizeof (GtkPreviewProp), FALSE, NULL, NULL, NULL, (guchar**) &prop)) { *nred = ntohs (prop->nred_shades); *ngreen = ntohs (prop->ngreen_shades); *nblue = ntohs (prop->nblue_shades); *ngray = ntohs (prop->ngray_shades); prop->ref_count = htons (ntohs (prop->ref_count) + 1); gdk_property_change (NULL, property, property, 16, GDK_PROP_MODE_REPLACE, (guchar*) prop, 5); return TRUE; } return FALSE; } static void gtk_set_preview_prop (guint nred, guint ngreen, guint nblue, guint ngray) { GtkPreviewProp prop; GdkAtom property; property = gdk_atom_intern ("GTK_PREVIEW_INFO", FALSE); prop.ref_count = htons (1); prop.nred_shades = htons (nred); prop.ngreen_shades = htons (ngreen); prop.nblue_shades = htons (nblue); prop.ngray_shades = htons (ngray); gdk_property_change (NULL, property, property, 16, GDK_PROP_MODE_REPLACE, (guchar*) &prop, 5); } static void gtk_lsbmsb_1_1 (guchar *dest, guchar *src, gint count) { memcpy (dest, src, count); } static void gtk_lsb_2_2 (guchar *dest, guchar *src, gint count) { memcpy (dest, src, count * 2); } static void gtk_msb_2_2 (guchar *dest, guchar *src, gint count) { while (count--) { dest[0] = src[1]; dest[1] = src[0]; dest += 2; src += 2; } } static void gtk_lsb_3_3 (guchar *dest, guchar *src, gint count) { memcpy (dest, src, count * 3); } static void gtk_msb_3_3 (guchar *dest, guchar *src, gint count) { while (count--) { dest[0] = src[2]; dest[1] = src[1]; dest[2] = src[0]; dest += 3; src += 3; } } static void gtk_lsb_3_4 (guchar *dest, guchar *src, gint count) { while (count--) { dest[0] = src[0]; dest[1] = src[1]; dest[2] = src[2]; dest += 4; src += 3; } } static void gtk_msb_3_4 (guchar *dest, guchar *src, gint count) { while (count--) { dest[1] = src[2]; dest[2] = src[1]; dest[3] = src[0]; dest += 4; src += 3; } }