342 lines
9.7 KiB
C
342 lines
9.7 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikawidgets/pikawidgets.h"
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#include "libpikamath/pikamath.h"
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#include "libpikacolor/pikacolor.h"
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#include "libpikaconfig/pikaconfig.h"
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#include "widgets-types.h"
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#include "pikacolorbar.h"
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enum
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{
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PROP_0,
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PROP_ORIENTATION,
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PROP_COLOR,
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PROP_CHANNEL
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};
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/* local function prototypes */
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static void pika_color_bar_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_color_bar_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static gboolean pika_color_bar_draw (GtkWidget *widget,
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cairo_t *cr);
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G_DEFINE_TYPE (PikaColorBar, pika_color_bar, GTK_TYPE_EVENT_BOX)
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#define parent_class pika_color_bar_parent_class
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static void
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pika_color_bar_class_init (PikaColorBarClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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PikaRGB white = { 1.0, 1.0, 1.0, 1.0 };
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object_class->set_property = pika_color_bar_set_property;
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object_class->get_property = pika_color_bar_get_property;
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widget_class->draw = pika_color_bar_draw;
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g_object_class_install_property (object_class, PROP_ORIENTATION,
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g_param_spec_enum ("orientation",
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NULL, NULL,
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GTK_TYPE_ORIENTATION,
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GTK_ORIENTATION_HORIZONTAL,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY));
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g_object_class_install_property (object_class, PROP_COLOR,
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pika_param_spec_rgb ("color",
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NULL, NULL,
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FALSE, &white,
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PIKA_PARAM_WRITABLE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_CHANNEL,
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g_param_spec_enum ("histogram-channel",
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NULL, NULL,
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PIKA_TYPE_HISTOGRAM_CHANNEL,
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PIKA_HISTOGRAM_VALUE,
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PIKA_PARAM_WRITABLE));
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}
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static void
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pika_color_bar_init (PikaColorBar *bar)
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{
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gtk_event_box_set_visible_window (GTK_EVENT_BOX (bar), FALSE);
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bar->orientation = GTK_ORIENTATION_HORIZONTAL;
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}
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static void
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pika_color_bar_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaColorBar *bar = PIKA_COLOR_BAR (object);
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switch (property_id)
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{
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case PROP_ORIENTATION:
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bar->orientation = g_value_get_enum (value);
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break;
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case PROP_COLOR:
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pika_color_bar_set_color (bar, g_value_get_boxed (value));
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break;
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case PROP_CHANNEL:
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pika_color_bar_set_channel (bar, g_value_get_enum (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_color_bar_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaColorBar *bar = PIKA_COLOR_BAR (object);
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switch (property_id)
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{
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case PROP_ORIENTATION:
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g_value_set_enum (value, bar->orientation);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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pika_color_bar_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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PikaColorBar *bar = PIKA_COLOR_BAR (widget);
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GtkAllocation allocation;
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cairo_surface_t *surface;
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cairo_pattern_t *pattern;
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guchar *src;
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guchar *dest;
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gint x, y;
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gint width, height;
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gint i;
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gtk_widget_get_allocation (widget, &allocation);
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x = y = gtk_container_get_border_width (GTK_CONTAINER (bar));
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width = allocation.width - 2 * x;
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height = allocation.height - 2 * y;
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if (width < 1 || height < 1)
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return TRUE;
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cairo_translate (cr, x, y);
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_clip (cr);
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surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 256, 1);
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for (i = 0, src = bar->buf, dest = cairo_image_surface_get_data (surface);
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i < 256;
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i++, src += 3, dest += 4)
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{
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PIKA_CAIRO_RGB24_SET_PIXEL(dest, src[0], src[1], src[2]);
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}
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cairo_surface_mark_dirty (surface);
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pattern = cairo_pattern_create_for_surface (surface);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
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cairo_surface_destroy (surface);
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if (bar->orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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cairo_scale (cr, (gdouble) width / 256.0, 1.0);
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}
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else
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{
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cairo_translate (cr, 0, height);
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cairo_scale (cr, 1.0, (gdouble) height / 256.0);
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cairo_rotate (cr, - G_PI / 2);
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}
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_paint (cr);
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return TRUE;
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}
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/* public functions */
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/**
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* pika_color_bar_new:
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* @orientation: whether the bar should be oriented horizontally or
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* vertically
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*
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* Creates a new #PikaColorBar widget.
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*
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* Returns: The new #PikaColorBar widget.
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**/
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GtkWidget *
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pika_color_bar_new (GtkOrientation orientation)
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{
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return g_object_new (PIKA_TYPE_COLOR_BAR,
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"orientation", orientation,
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NULL);
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}
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/**
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* pika_color_bar_set_color:
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* @bar: a #PikaColorBar widget
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* @color: a #PikaRGB color
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*
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* Makes the @bar display a gradient from black (on the left or the
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* bottom), to the given @color (on the right or at the top).
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**/
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void
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pika_color_bar_set_color (PikaColorBar *bar,
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const PikaRGB *color)
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{
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guchar *buf;
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gint i;
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g_return_if_fail (PIKA_IS_COLOR_BAR (bar));
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g_return_if_fail (color != NULL);
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for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
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{
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buf[0] = ROUND (color->r * (gdouble) i);
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buf[1] = ROUND (color->g * (gdouble) i);
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buf[2] = ROUND (color->b * (gdouble) i);
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}
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gtk_widget_queue_draw (GTK_WIDGET (bar));
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}
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/**
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* pika_color_bar_set_channel:
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* @bar: a #PikaColorBar widget
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* @channel: a #PikaHistogramChannel
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*
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* Convenience function that calls pika_color_bar_set_color() with the
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* color that matches the @channel.
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**/
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void
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pika_color_bar_set_channel (PikaColorBar *bar,
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PikaHistogramChannel channel)
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{
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PikaRGB color = { 1.0, 1.0, 1.0, 1.0 };
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g_return_if_fail (PIKA_IS_COLOR_BAR (bar));
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switch (channel)
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{
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case PIKA_HISTOGRAM_VALUE:
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case PIKA_HISTOGRAM_LUMINANCE:
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case PIKA_HISTOGRAM_ALPHA:
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case PIKA_HISTOGRAM_RGB:
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pika_rgb_set (&color, 1.0, 1.0, 1.0);
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break;
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case PIKA_HISTOGRAM_RED:
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pika_rgb_set (&color, 1.0, 0.0, 0.0);
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break;
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case PIKA_HISTOGRAM_GREEN:
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pika_rgb_set (&color, 0.0, 1.0, 0.0);
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break;
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case PIKA_HISTOGRAM_BLUE:
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pika_rgb_set (&color, 0.0, 0.0, 1.0);
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break;
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}
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pika_color_bar_set_color (bar, &color);
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}
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/**
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* pika_color_bar_set_buffers:
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* @bar: a #PikaColorBar widget
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* @red: an array of 256 values
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* @green: an array of 256 values
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* @blue: an array of 256 values
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*
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* This function gives full control over the colors displayed by the
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* @bar widget. The 3 arrays can for example be taken from a #Levels
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* or a #Curves struct.
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**/
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void
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pika_color_bar_set_buffers (PikaColorBar *bar,
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const guchar *red,
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const guchar *green,
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const guchar *blue)
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{
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guchar *buf;
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gint i;
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g_return_if_fail (PIKA_IS_COLOR_BAR (bar));
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g_return_if_fail (red != NULL);
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g_return_if_fail (green != NULL);
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g_return_if_fail (blue != NULL);
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for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
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{
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buf[0] = red[i];
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buf[1] = green[i];
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buf[2] = blue[i];
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}
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gtk_widget_queue_draw (GTK_WIDGET (bar));
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}
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