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-rw-r--r--app/widgets/gimpcolorbar.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/app/widgets/gimpcolorbar.c b/app/widgets/gimpcolorbar.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "widgets-types.h"
+
+#include "gimpcolorbar.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_ORIENTATION,
+ PROP_COLOR,
+ PROP_CHANNEL
+};
+
+
+/* local function prototypes */
+
+static void gimp_color_bar_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_color_bar_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_color_bar_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+
+
+G_DEFINE_TYPE (GimpColorBar, gimp_color_bar, GTK_TYPE_EVENT_BOX)
+
+#define parent_class gimp_color_bar_parent_class
+
+
+static void
+gimp_color_bar_class_init (GimpColorBarClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+ GimpRGB white = { 1.0, 1.0, 1.0, 1.0 };
+
+ object_class->set_property = gimp_color_bar_set_property;
+ object_class->get_property = gimp_color_bar_get_property;
+
+ widget_class->expose_event = gimp_color_bar_expose;
+
+ g_object_class_install_property (object_class, PROP_ORIENTATION,
+ g_param_spec_enum ("orientation",
+ NULL, NULL,
+ GTK_TYPE_ORIENTATION,
+ GTK_ORIENTATION_HORIZONTAL,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (object_class, PROP_COLOR,
+ gimp_param_spec_rgb ("color",
+ NULL, NULL,
+ FALSE, &white,
+ GIMP_PARAM_WRITABLE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_CHANNEL,
+ g_param_spec_enum ("histogram-channel",
+ NULL, NULL,
+ GIMP_TYPE_HISTOGRAM_CHANNEL,
+ GIMP_HISTOGRAM_VALUE,
+ GIMP_PARAM_WRITABLE));
+}
+
+static void
+gimp_color_bar_init (GimpColorBar *bar)
+{
+ gtk_event_box_set_visible_window (GTK_EVENT_BOX (bar), FALSE);
+
+ bar->orientation = GTK_ORIENTATION_HORIZONTAL;
+}
+
+
+static void
+gimp_color_bar_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpColorBar *bar = GIMP_COLOR_BAR (object);
+
+ switch (property_id)
+ {
+ case PROP_ORIENTATION:
+ bar->orientation = g_value_get_enum (value);
+ break;
+ case PROP_COLOR:
+ gimp_color_bar_set_color (bar, g_value_get_boxed (value));
+ break;
+ case PROP_CHANNEL:
+ gimp_color_bar_set_channel (bar, g_value_get_enum (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_color_bar_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpColorBar *bar = GIMP_COLOR_BAR (object);
+
+ switch (property_id)
+ {
+ case PROP_ORIENTATION:
+ g_value_set_enum (value, bar->orientation);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_color_bar_expose (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpColorBar *bar = GIMP_COLOR_BAR (widget);
+ cairo_t *cr;
+ GtkAllocation allocation;
+ cairo_surface_t *surface;
+ cairo_pattern_t *pattern;
+ guchar *src;
+ guchar *dest;
+ gint x, y;
+ gint width, height;
+ gint i;
+
+ cr = gdk_cairo_create (event->window);
+
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ x = y = gtk_container_get_border_width (GTK_CONTAINER (bar));
+
+ width = allocation.width - 2 * x;
+ height = allocation.height - 2 * y;
+
+ if (width < 1 || height < 1)
+ return TRUE;
+
+ cairo_translate (cr, allocation.x + x, allocation.y + y);
+ cairo_rectangle (cr, 0, 0, width, height);
+ cairo_clip (cr);
+
+ surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 256, 1);
+
+ for (i = 0, src = bar->buf, dest = cairo_image_surface_get_data (surface);
+ i < 256;
+ i++, src += 3, dest += 4)
+ {
+ GIMP_CAIRO_RGB24_SET_PIXEL(dest, src[0], src[1], src[2]);
+ }
+
+ cairo_surface_mark_dirty (surface);
+
+ pattern = cairo_pattern_create_for_surface (surface);
+ cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
+ cairo_surface_destroy (surface);
+
+ if (bar->orientation == GTK_ORIENTATION_HORIZONTAL)
+ {
+ cairo_scale (cr, (gdouble) width / 256.0, 1.0);
+ }
+ else
+ {
+ cairo_translate (cr, 0, height);
+ cairo_scale (cr, 1.0, (gdouble) height / 256.0);
+ cairo_rotate (cr, - G_PI / 2);
+ }
+
+ cairo_set_source (cr, pattern);
+ cairo_pattern_destroy (pattern);
+
+ cairo_paint (cr);
+
+ cairo_destroy (cr);
+
+ return TRUE;
+}
+
+
+/* public functions */
+
+/**
+ * gimp_color_bar_new:
+ * @orientation: whether the bar should be oriented horizontally or
+ * vertically
+ *
+ * Creates a new #GimpColorBar widget.
+ *
+ * Return value: The new #GimpColorBar widget.
+ **/
+GtkWidget *
+gimp_color_bar_new (GtkOrientation orientation)
+{
+ return g_object_new (GIMP_TYPE_COLOR_BAR,
+ "orientation", orientation,
+ NULL);
+}
+
+/**
+ * gimp_color_bar_set_color:
+ * @bar: a #GimpColorBar widget
+ * @color: a #GimpRGB color
+ *
+ * Makes the @bar display a gradient from black (on the left or the
+ * bottom), to the given @color (on the right or at the top).
+ **/
+void
+gimp_color_bar_set_color (GimpColorBar *bar,
+ const GimpRGB *color)
+{
+ guchar *buf;
+ gint i;
+
+ g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
+ g_return_if_fail (color != NULL);
+
+ for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
+ {
+ buf[0] = ROUND (color->r * (gdouble) i);
+ buf[1] = ROUND (color->g * (gdouble) i);
+ buf[2] = ROUND (color->b * (gdouble) i);
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (bar));
+}
+
+/**
+ * gimp_color_bar_set_channel:
+ * @bar: a #GimpColorBar widget
+ * @channel: a #GimpHistogramChannel
+ *
+ * Convenience function that calls gimp_color_bar_set_color() with the
+ * color that matches the @channel.
+ **/
+void
+gimp_color_bar_set_channel (GimpColorBar *bar,
+ GimpHistogramChannel channel)
+{
+ GimpRGB color = { 1.0, 1.0, 1.0, 1.0 };
+
+ g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
+
+ switch (channel)
+ {
+ case GIMP_HISTOGRAM_VALUE:
+ case GIMP_HISTOGRAM_LUMINANCE:
+ case GIMP_HISTOGRAM_ALPHA:
+ case GIMP_HISTOGRAM_RGB:
+ gimp_rgb_set (&color, 1.0, 1.0, 1.0);
+ break;
+ case GIMP_HISTOGRAM_RED:
+ gimp_rgb_set (&color, 1.0, 0.0, 0.0);
+ break;
+ case GIMP_HISTOGRAM_GREEN:
+ gimp_rgb_set (&color, 0.0, 1.0, 0.0);
+ break;
+ case GIMP_HISTOGRAM_BLUE:
+ gimp_rgb_set (&color, 0.0, 0.0, 1.0);
+ break;
+ }
+
+ gimp_color_bar_set_color (bar, &color);
+}
+
+/**
+ * gimp_color_bar_set_buffers:
+ * @bar: a #GimpColorBar widget
+ * @red: an array of 256 values
+ * @green: an array of 256 values
+ * @blue: an array of 256 values
+ *
+ * This function gives full control over the colors displayed by the
+ * @bar widget. The 3 arrays can for example be taken from a #Levels
+ * or a #Curves struct.
+ **/
+void
+gimp_color_bar_set_buffers (GimpColorBar *bar,
+ const guchar *red,
+ const guchar *green,
+ const guchar *blue)
+{
+ guchar *buf;
+ gint i;
+
+ g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
+ g_return_if_fail (red != NULL);
+ g_return_if_fail (green != NULL);
+ g_return_if_fail (blue != NULL);
+
+ for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
+ {
+ buf[0] = red[i];
+ buf[1] = green[i];
+ buf[2] = blue[i];
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (bar));
+}
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