/* GIMP - The GNU Image Manipulation Program * Copyright (C) 1999 Manish Singh * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "config.h" #include #include "libgimpcolor/gimpcolor.h" #include "libgimpconfig/gimpconfig.h" #include "libgimpmath/gimpmath.h" #include "libgimpmodule/gimpmodule.h" #include "libgimpwidgets/gimpwidgets.h" #include "libgimp/libgimp-intl.h" #define DEFAULT_CONTRAST 1.0 #define CDISPLAY_TYPE_CONTRAST (cdisplay_contrast_get_type ()) #define CDISPLAY_CONTRAST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_CONTRAST, CdisplayContrast)) #define CDISPLAY_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_CONTRAST, CdisplayContrastClass)) #define CDISPLAY_IS_CONTRAST(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_CONTRAST)) #define CDISPLAY_IS_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_CONTRAST)) typedef struct _CdisplayContrast CdisplayContrast; typedef struct _CdisplayContrastClass CdisplayContrastClass; struct _CdisplayContrast { GimpColorDisplay parent_instance; gdouble contrast; guchar lookup[256]; }; struct _CdisplayContrastClass { GimpColorDisplayClass parent_instance; }; enum { PROP_0, PROP_CONTRAST }; GType cdisplay_contrast_get_type (void); static void cdisplay_contrast_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec); static void cdisplay_contrast_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec); static void cdisplay_contrast_convert_surface (GimpColorDisplay *display, cairo_surface_t *surface); static GtkWidget * cdisplay_contrast_configure (GimpColorDisplay *display); static void cdisplay_contrast_set_contrast (CdisplayContrast *contrast, gdouble value); static const GimpModuleInfo cdisplay_contrast_info = { GIMP_MODULE_ABI_VERSION, N_("High Contrast color display filter"), "Jay Cox ", "v0.2", "(c) 2000, released under the GPL", "October 14, 2000" }; G_DEFINE_DYNAMIC_TYPE (CdisplayContrast, cdisplay_contrast, GIMP_TYPE_COLOR_DISPLAY) G_MODULE_EXPORT const GimpModuleInfo * gimp_module_query (GTypeModule *module) { return &cdisplay_contrast_info; } G_MODULE_EXPORT gboolean gimp_module_register (GTypeModule *module) { cdisplay_contrast_register_type (module); return TRUE; } static void cdisplay_contrast_class_init (CdisplayContrastClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GimpColorDisplayClass *display_class = GIMP_COLOR_DISPLAY_CLASS (klass); object_class->get_property = cdisplay_contrast_get_property; object_class->set_property = cdisplay_contrast_set_property; GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_CONTRAST, "contrast", NULL, 0.01, 10.0, DEFAULT_CONTRAST, 0); display_class->name = _("Contrast"); display_class->help_id = "gimp-colordisplay-contrast"; display_class->stock_id = GIMP_STOCK_DISPLAY_FILTER_CONTRAST; display_class->convert_surface = cdisplay_contrast_convert_surface; display_class->configure = cdisplay_contrast_configure; } static void cdisplay_contrast_class_finalize (CdisplayContrastClass *klass) { } static void cdisplay_contrast_init (CdisplayContrast *contrast) { } static void cdisplay_contrast_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec) { CdisplayContrast *contrast = CDISPLAY_CONTRAST (object); switch (property_id) { case PROP_CONTRAST: g_value_set_double (value, contrast->contrast); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } static void cdisplay_contrast_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { CdisplayContrast *contrast = CDISPLAY_CONTRAST (object); switch (property_id) { case PROP_CONTRAST: cdisplay_contrast_set_contrast (contrast, g_value_get_double (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } static void cdisplay_contrast_convert_surface (GimpColorDisplay *display, cairo_surface_t *surface) { CdisplayContrast *contrast = CDISPLAY_CONTRAST (display); gint width = cairo_image_surface_get_width (surface); gint height = cairo_image_surface_get_height (surface); gint stride = cairo_image_surface_get_stride (surface); guchar *buf = cairo_image_surface_get_data (surface); cairo_format_t fmt = cairo_image_surface_get_format (surface); gint i, j, skip; gint r, g, b, a; if (fmt != CAIRO_FORMAT_ARGB32) return; /* You will not be using the entire buffer most of the time. * Hence, the simplistic code for this is as follows: * * for (j = 0; j < height; j++) * { * for (i = 0; i < width * bpp; i++) * buf[i] = lookup[buf[i]]; * buf += bpl; * } */ j = height; skip = stride - 4 * width; while (j--) { i = width; while (i--) { GIMP_CAIRO_ARGB32_GET_PIXEL (buf, r, g, b, a); r = contrast->lookup[r]; g = contrast->lookup[g]; b = contrast->lookup[b]; GIMP_CAIRO_ARGB32_SET_PIXEL (buf, r, g, b, a); buf += 4; } buf += skip; } } static GtkWidget * cdisplay_contrast_configure (GimpColorDisplay *display) { CdisplayContrast *contrast = CDISPLAY_CONTRAST (display); GtkWidget *hbox; GtkWidget *label; GtkWidget *spinbutton; hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6); label = gtk_label_new_with_mnemonic (_("Contrast c_ycles:")); gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0); gtk_widget_show (label); spinbutton = gimp_prop_spin_button_new (G_OBJECT (contrast), "contrast", 0.1, 1.0, 3); gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0); gtk_widget_show (spinbutton); gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton); return hbox; } static void cdisplay_contrast_set_contrast (CdisplayContrast *contrast, gdouble value) { if (value <= 0.0) value = 1.0; if (value != contrast->contrast) { gint i; contrast->contrast = value; for (i = 0; i < 256; i++) { contrast->lookup[i] = (guchar) (gint) (255 * .5 * (1 + sin (value * 2 * G_PI * i / 255.0))); } g_object_notify (G_OBJECT (contrast), "contrast"); gimp_color_display_changed (GIMP_COLOR_DISPLAY (contrast)); } }