[gimp] app: add GimpMeter widget
- From: N/A <ell src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gimp] app: add GimpMeter widget
- Date: Tue, 19 Dec 2017 00:43:12 +0000 (UTC)
commit 8f3cb718ef350a8608e85effe8f82e0d1ec16f58
Author: Ell <ell_se yahoo com>
Date: Mon Dec 18 18:46:12 2017 -0500
app: add GimpMeter widget
GimpMeter visualizes a set of values that change over time. It
consists of a gauge, showing the most-recent sampled values, a
history graph, showing a plot of the values over time, and an LED,
which can be used as a boolean indicator for some condition.
GimpMeter is used in the dashboard dockable, added in the next
commit.
app/widgets/Makefile.am | 2 +
app/widgets/gimpmeter.c | 1120 +++++++++++++++++++++++++++++++++++++++++++
app/widgets/gimpmeter.h | 103 ++++
app/widgets/widgets-types.h | 1 +
4 files changed, 1226 insertions(+), 0 deletions(-)
---
diff --git a/app/widgets/Makefile.am b/app/widgets/Makefile.am
index 4ed2e74..6501bda 100644
--- a/app/widgets/Makefile.am
+++ b/app/widgets/Makefile.am
@@ -253,6 +253,8 @@ libappwidgets_a_sources = \
gimpmessagebox.h \
gimpmessagedialog.c \
gimpmessagedialog.h \
+ gimpmeter.c \
+ gimpmeter.h \
gimpnavigationview.c \
gimpnavigationview.h \
gimpopendialog.c \
diff --git a/app/widgets/gimpmeter.c b/app/widgets/gimpmeter.c
new file mode 100644
index 0000000..953fbb7
--- /dev/null
+++ b/app/widgets/gimpmeter.c
@@ -0,0 +1,1120 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpmeter.c
+ * Copyright (C) 2017 Ell
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "widgets-types.h"
+
+#include "gimpmeter.h"
+
+
+#define BORDER_WIDTH 1.0
+#define REV (2.0 * G_PI)
+
+#define SAMPLE(i) (meter->priv->samples + (i) * meter->priv->n_values)
+#define SAMPLE_SIZE (meter->priv->n_values * sizeof (gdouble))
+#define VALUE(i, j) ((SAFE_CLAMP (SAMPLE (i)[j], \
+ meter->priv->range_min, \
+ meter->priv->range_max) - \
+ meter->priv->range_min) / \
+ (meter->priv->range_max - meter->priv->range_min))
+
+
+enum
+{
+ PROP_0,
+ PROP_SIZE,
+ PROP_REFRESH_RATE,
+ PROP_RANGE_MIN,
+ PROP_RANGE_MAX,
+ PROP_N_VALUES,
+ PROP_HISTORY_VISIBLE,
+ PROP_HISTORY_DURATION,
+ PROP_HISTORY_RESOLUTION,
+ PROP_LED_VISIBLE,
+ PROP_LED_COLOR
+};
+
+
+struct _GimpMeterPrivate
+{
+ GMutex mutex;
+
+ gint size;
+ gdouble refresh_rate;
+ gdouble range_min;
+ gdouble range_max;
+ gint n_values;
+ GimpRGB *colors;
+ gboolean history_visible;
+ gdouble history_duration;
+ gdouble history_resolution;
+ gboolean led_visible;
+ GimpRGB led_color;
+
+ gdouble *samples;
+ gint n_samples;
+ gint sample_duration;
+ gint64 last_sample_time;
+ gint64 current_time;
+ gdouble *uniform_sample;
+ gint timeout_id;
+};
+
+
+static void gimp_meter_dispose (GObject *object);
+static void gimp_meter_finalize (GObject *object);
+static void gimp_meter_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_meter_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_meter_map (GtkWidget *widget);
+static void gimp_meter_unmap (GtkWidget *widget);
+static void gimp_meter_size_request (GtkWidget *widget,
+ GtkRequisition *requisition);
+static gboolean gimp_meter_expose_event (GtkWidget *widget,
+ GdkEventExpose *event);
+
+static gboolean gimp_meter_timeout (GimpMeter *meter);
+
+static void gimp_meter_clear_history_unlocked (GimpMeter *meter);
+static void gimp_meter_update_samples (GimpMeter *meter);
+static void gimp_meter_shift_samples (GimpMeter *meter);
+
+
+G_DEFINE_TYPE (GimpMeter, gimp_meter, GTK_TYPE_WIDGET)
+
+#define parent_class gimp_meter_parent_class
+
+
+/* private functions */
+
+
+static void
+gimp_meter_class_init (GimpMeterClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->dispose = gimp_meter_dispose;
+ object_class->finalize = gimp_meter_finalize;
+ object_class->get_property = gimp_meter_get_property;
+ object_class->set_property = gimp_meter_set_property;
+
+ widget_class->map = gimp_meter_map;
+ widget_class->unmap = gimp_meter_unmap;
+ widget_class->size_request = gimp_meter_size_request;
+ widget_class->expose_event = gimp_meter_expose_event;
+
+ g_object_class_install_property (object_class, PROP_SIZE,
+ g_param_spec_int ("size",
+ NULL, NULL,
+ 32, 1024, 48,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_REFRESH_RATE,
+ g_param_spec_double ("refresh-rate",
+ NULL, NULL,
+ 0.001, 1000.0, 8.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_RANGE_MIN,
+ g_param_spec_double ("range-min",
+ NULL, NULL,
+ 0.0, G_MAXDOUBLE, 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_RANGE_MAX,
+ g_param_spec_double ("range-max",
+ NULL, NULL,
+ 0.0, G_MAXDOUBLE, 1.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_N_VALUES,
+ g_param_spec_int ("n-values",
+ NULL, NULL,
+ 0, 32, 0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_HISTORY_VISIBLE,
+ g_param_spec_boolean ("history-visible",
+ NULL, NULL,
+ TRUE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_HISTORY_DURATION,
+ g_param_spec_double ("history-duration",
+ NULL, NULL,
+ 0.0, 3600.0, 60.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_HISTORY_RESOLUTION,
+ g_param_spec_double ("history-resolution",
+ NULL, NULL,
+ 0.1, 3600.0, 1.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+
+ g_object_class_install_property (object_class, PROP_LED_VISIBLE,
+ g_param_spec_boolean ("led-visible",
+ NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_LED_COLOR,
+ gimp_param_spec_rgb ("led-color",
+ NULL, NULL,
+ TRUE, &(GimpRGB) {},
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_type_class_add_private (klass, sizeof (GimpMeterPrivate));
+}
+
+static void
+gimp_meter_init (GimpMeter *meter)
+{
+ meter->priv = G_TYPE_INSTANCE_GET_PRIVATE (meter,
+ GIMP_TYPE_METER,
+ GimpMeterPrivate);
+
+ g_mutex_init (&meter->priv->mutex);
+
+ gtk_widget_set_has_window (GTK_WIDGET (meter), FALSE);
+
+ meter->priv->range_min = 0.0;
+ meter->priv->range_max = 1.0;
+ meter->priv->n_values = 0;
+ meter->priv->history_duration = 60.0;
+ meter->priv->history_resolution = 1.0;
+
+ gimp_meter_update_samples (meter);
+}
+
+static void
+gimp_meter_dispose (GObject *object)
+{
+ GimpMeter *meter = GIMP_METER (object);
+
+ g_clear_pointer (&meter->priv->colors, g_free);
+ g_clear_pointer (&meter->priv->samples, g_free);
+ g_clear_pointer (&meter->priv->uniform_sample, g_free);
+
+ if (meter->priv->timeout_id)
+ {
+ g_source_remove (meter->priv->timeout_id);
+ meter->priv->timeout_id = 0;
+ }
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_meter_finalize (GObject *object)
+{
+ GimpMeter *meter = GIMP_METER (object);
+
+ g_mutex_clear (&meter->priv->mutex);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_meter_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpMeter *meter = GIMP_METER (object);
+
+ switch (property_id)
+ {
+ case PROP_SIZE:
+ gimp_meter_set_size (meter, g_value_get_int (value));
+ break;
+
+ case PROP_REFRESH_RATE:
+ gimp_meter_set_refresh_rate (meter, g_value_get_double (value));
+ break;
+
+ case PROP_RANGE_MIN:
+ gimp_meter_set_range (meter,
+ g_value_get_double (value),
+ gimp_meter_get_range_max (meter));
+ break;
+
+ case PROP_RANGE_MAX:
+ gimp_meter_set_range (meter,
+ gimp_meter_get_range_min (meter),
+ g_value_get_double (value));
+ break;
+
+ case PROP_N_VALUES:
+ gimp_meter_set_n_values (meter, g_value_get_int (value));
+ break;
+
+ case PROP_HISTORY_VISIBLE:
+ gimp_meter_set_history_visible (meter, g_value_get_boolean (value));
+ break;
+
+ case PROP_HISTORY_DURATION:
+ gimp_meter_set_history_duration (meter, g_value_get_double (value));
+ break;
+
+ case PROP_HISTORY_RESOLUTION:
+ gimp_meter_set_history_resolution (meter, g_value_get_double (value));
+ break;
+
+ case PROP_LED_VISIBLE:
+ gimp_meter_set_led_visible (meter, g_value_get_boolean (value));
+ break;
+
+ case PROP_LED_COLOR:
+ gimp_meter_set_led_color (meter, g_value_get_boxed (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_meter_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpMeter *meter = GIMP_METER (object);
+
+ switch (property_id)
+ {
+ case PROP_SIZE:
+ g_value_set_int (value, gimp_meter_get_size (meter));
+ break;
+
+ case PROP_REFRESH_RATE:
+ g_value_set_double (value, gimp_meter_get_refresh_rate (meter));
+ break;
+
+ case PROP_RANGE_MIN:
+ g_value_set_double (value, gimp_meter_get_range_min (meter));
+ break;
+
+ case PROP_RANGE_MAX:
+ g_value_set_double (value, gimp_meter_get_range_max (meter));
+ break;
+
+ case PROP_N_VALUES:
+ g_value_set_int (value, gimp_meter_get_n_values (meter));
+ break;
+
+ case PROP_HISTORY_VISIBLE:
+ g_value_set_boolean (value, gimp_meter_get_history_visible (meter));
+ break;
+
+ case PROP_HISTORY_DURATION:
+ g_value_set_int (value, gimp_meter_get_history_duration (meter));
+ break;
+
+ case PROP_HISTORY_RESOLUTION:
+ g_value_set_int (value, gimp_meter_get_history_resolution (meter));
+ break;
+
+ case PROP_LED_VISIBLE:
+ g_value_set_boolean (value, gimp_meter_get_led_visible (meter));
+ break;
+
+ case PROP_LED_COLOR:
+ g_value_set_boxed (value, gimp_meter_get_led_color (meter));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_meter_map (GtkWidget *widget)
+{
+ GimpMeter *meter = GIMP_METER (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->map (widget);
+
+ if (! meter->priv->timeout_id)
+ {
+ gint interval = ROUND (1000.0 / meter->priv->refresh_rate);
+
+ meter->priv->timeout_id = g_timeout_add (interval,
+ (GSourceFunc) gimp_meter_timeout,
+ meter);
+ }
+}
+
+static void
+gimp_meter_unmap (GtkWidget *widget)
+{
+ GimpMeter *meter = GIMP_METER (widget);
+
+ if (meter->priv->timeout_id)
+ {
+ g_source_remove (meter->priv->timeout_id);
+ meter->priv->timeout_id = 0;
+ }
+
+ GTK_WIDGET_CLASS (parent_class)->unmap (widget);
+}
+
+static void
+gimp_meter_size_request (GtkWidget *widget,
+ GtkRequisition *requisition)
+{
+ gint hsize;
+ gint vsize;
+
+ GimpMeter *meter = GIMP_METER (widget);
+
+ hsize = meter->priv->size;
+ vsize = meter->priv->size;
+
+ if (meter->priv->history_visible)
+ hsize *= 3;
+
+ requisition->width = ceil ( hsize + 2.0 * BORDER_WIDTH);
+ requisition->height = ceil (3.0 / 4.0 * vsize + 4.0 * BORDER_WIDTH);
+}
+
+static gboolean
+gimp_meter_expose_event (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpMeter *meter = GIMP_METER (widget);
+
+ if (gtk_widget_is_drawable (widget))
+ {
+ GtkAllocation allocation;
+ gint size = meter->priv->size;
+ GtkStyle *style = gtk_widget_get_style (widget);
+ GtkStateType state = gtk_widget_get_state (widget);
+ cairo_t *cr;
+ gint i;
+ gint j;
+ gint k;
+
+ g_mutex_lock (&meter->priv->mutex);
+
+ cr = gdk_cairo_create (event->window);
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ /* translate to allocation top-left */
+ cairo_translate (cr, allocation.x, allocation.y);
+
+ cairo_save (cr);
+
+ /* translate to gauge center */
+ cairo_translate (cr,
+ 0.5 * BORDER_WIDTH + 0.5 * size,
+ 1.5 * BORDER_WIDTH + 2.0 / 3.0 * (allocation.height - 4.0 * BORDER_WIDTH));
+
+ cairo_save (cr);
+
+ /* paint led */
+ if (meter->priv->led_visible)
+ {
+ cairo_arc (cr,
+ 0.0, 0.0,
+ 0.06 * size,
+ 0.0 * REV, 1.0 * REV);
+
+ gimp_cairo_set_source_rgba (cr, &meter->priv->led_color);
+ cairo_fill (cr);
+ }
+
+ /* clip to gauge interior */
+ cairo_arc (cr,
+ 0.0, 0.0,
+ 0.5 * size,
+ 5.0 / 12.0 * REV, 1.0 / 12.0 * REV);
+ cairo_arc_negative (cr,
+ 0.0, 0.0,
+ 0.1 * size,
+ 1.0 / 12.0 * REV, 5.0 / 12.0 * REV);
+ cairo_close_path (cr);
+ cairo_clip (cr);
+
+ /* paint gauge background */
+ gdk_cairo_set_source_color (cr, &style->light[state]);
+ cairo_paint (cr);
+
+ /* paint values of last sample */
+ if (meter->priv->range_min < meter->priv->range_max)
+ {
+ for (i = 0; i < meter->priv->n_values; i++)
+ {
+ gdouble v = VALUE (0, i);
+
+ gimp_cairo_set_source_rgba (cr, &meter->priv->colors[i]);
+ cairo_move_to (cr, 0.0, 0.0);
+ cairo_arc (cr,
+ 0.0, 0.0,
+
+ 0.5 * size,
+ 5.0 / 12.0 * REV, (5.0 / 12.0 + 2.0 / 3.0 * v) * REV);
+ cairo_line_to (cr, 0.0, 0.0);
+ cairo_close_path (cr);
+ cairo_fill (cr);
+ }
+ }
+
+ cairo_restore (cr);
+
+ /* paint gauge border */
+ gdk_cairo_set_source_color (cr, &style->fg[state]);
+ cairo_set_line_width (cr, BORDER_WIDTH);
+ cairo_arc (cr,
+ 0.0, 0.0,
+ 0.5 * size,
+ 5.0 / 12.0 * REV, 1.0 / 12.0 * REV);
+ cairo_arc_negative (cr,
+ 0.0, 0.0,
+ 0.1 * size,
+ 1.0 / 12.0 * REV, 5.0 / 12.0 * REV);
+ cairo_close_path (cr);
+ cairo_stroke (cr);
+
+ /* history */
+ if (meter->priv->history_visible)
+ {
+ gdouble a1, a2;
+ gdouble history_x1, history_y1;
+ gdouble history_x2, history_y2;
+
+ cairo_save (cr);
+
+ a1 = +asin (0.25 / 0.6);
+ a2 = -asin (0.50 / 0.6);
+
+ /* clip to history interior */
+ cairo_arc_negative (cr, 0.0, 0.0, 0.6 * size, a1, a2);
+ cairo_line_to (cr,
+ allocation.width - BORDER_WIDTH - 0.5 * size,
+ -0.50 * size);
+ cairo_line_to (cr,
+ allocation.width - BORDER_WIDTH - 0.5 * size,
+ 0.25 * size);
+ cairo_close_path (cr);
+ cairo_clip (cr);
+
+ cairo_clip_extents (cr,
+ &history_x1, &history_y1,
+ &history_x2, &history_y2);
+
+ history_x1 = floor (history_x1);
+ history_y1 = floor (history_y1);
+ history_x2 = ceil (history_x2);
+ history_y2 = ceil (history_y2);
+
+ /* paint history background */
+ gdk_cairo_set_source_color (cr, &style->light[state]);
+ cairo_paint (cr);
+
+ /* history graph */
+ if (meter->priv->range_min < meter->priv->range_max)
+ {
+ gdouble sample_width = (history_x2 - history_x1) /
+ (meter->priv->n_samples - 4);
+ gdouble dx = 1.0 / sample_width;
+
+ cairo_save (cr);
+
+ /* translate to history bottom-right, and scale so that the
+ * x-axis points left, and has a length of one sample, and the
+ * y-axis points up, and has a length of the history window.
+ */
+ cairo_translate (cr, history_x2, history_y2);
+ cairo_scale (cr, -sample_width, -(history_y2 - history_y1));
+ cairo_translate (cr,
+ (gdouble) (meter->priv->current_time -
+ meter->priv->last_sample_time *
+ meter->priv->sample_duration) /
+ meter->priv->sample_duration -
+ 2.0,
+ 0.0);
+
+ /* paint history graph for each value, with cubic interpolation */
+ for (i = 0; i < meter->priv->n_values; i++)
+ {
+ gdouble y[4];
+ gdouble t[2];
+ gdouble c[4];
+ gdouble x;
+
+ gimp_cairo_set_source_rgba (cr, &meter->priv->colors[i]);
+ cairo_move_to (cr, 0.0, 0.0);
+
+ for (j = 1; j < meter->priv->n_samples - 2; j++)
+ {
+ for (k = 0; k < 4; k++)
+ y[k] = VALUE (j + k - 1, i);
+
+ for (k = 0; k < 2; k++)
+ {
+ t[k] = (y[k + 2] - y[k]) / 2.0;
+ t[k] = CLAMP (t[k], y[k + 1] - 1.0, y[k + 1]);
+ t[k] = CLAMP (t[k], -y[k + 1], 1.0 - y[k + 1]);
+ }
+
+ c[0] = y[1];
+ c[1] = t[0];
+ c[2] = 3 * (y[2] - y[1]) - 2 * t[0] - t[1];
+ c[3] = t[0] + t[1] - 2 * (y[2] - y[1]);
+
+ for (x = 0.0; x < 1.0; x += dx)
+ {
+ gdouble y = ((c[3] * x + c[2]) * x + c[1]) * x + c[0];
+
+ cairo_line_to (cr, j + x, y);
+ }
+ }
+
+ y[1] = VALUE (j, i);
+
+ cairo_line_to (cr, meter->priv->n_samples - 2, y[1]);
+ cairo_line_to (cr, meter->priv->n_samples - 2, 0.0);
+ cairo_close_path (cr);
+ cairo_fill (cr);
+ }
+
+ cairo_restore (cr);
+ }
+
+ /* paint history grid */
+ cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
+ cairo_set_source_rgba (cr,
+ (gdouble) style->fg[state].red / 0xffff,
+ (gdouble) style->fg[state].green / 0xffff,
+ (gdouble) style->fg[state].blue / 0xffff,
+ 0.3);
+
+ for (i = 1; i < 4; i++)
+ {
+ cairo_move_to (cr,
+ history_x1,
+ history_y1 + i / 4.0 * (history_y2 - history_y1));
+ cairo_rel_line_to (cr, history_x2 - history_x1, 0.0);
+ cairo_stroke (cr);
+ }
+
+ for (i = 1; i < 6; i++)
+ {
+ cairo_move_to (cr,
+ history_x1 + i / 6.0 * (history_x2 - history_x1),
+ history_y1);
+ cairo_rel_line_to (cr, 0.0, history_y2 - history_y1);
+ cairo_stroke (cr);
+ }
+
+ cairo_restore (cr);
+
+ /* paint history border */
+ cairo_arc_negative (cr, 0.0, 0.0, 0.6 * size, a1, a2);
+ cairo_line_to (cr,
+ allocation.width - BORDER_WIDTH - 0.5 * size,
+ -0.50 * size);
+ cairo_line_to (cr,
+ allocation.width - BORDER_WIDTH - 0.5 * size,
+ 0.25 * size);
+ cairo_close_path (cr);
+ cairo_stroke (cr);
+ }
+
+ cairo_restore (cr);
+
+ cairo_destroy (cr);
+
+ g_mutex_unlock (&meter->priv->mutex);
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_meter_timeout (GimpMeter *meter)
+{
+ gboolean uniform;
+ gboolean redraw;
+
+ g_mutex_lock (&meter->priv->mutex);
+
+ gimp_meter_shift_samples (meter);
+
+ if (meter->priv->history_visible)
+ {
+ uniform = ! memcmp (SAMPLE (0), SAMPLE (1),
+ (meter->priv->n_samples - 1) * SAMPLE_SIZE);
+ }
+ else
+ {
+ uniform = TRUE;
+ }
+
+ if (uniform && meter->priv->uniform_sample)
+ redraw = memcmp (SAMPLE (0), meter->priv->uniform_sample, SAMPLE_SIZE);
+ else
+ redraw = TRUE;
+
+ if (uniform)
+ {
+ if (! meter->priv->uniform_sample)
+ meter->priv->uniform_sample = g_malloc (SAMPLE_SIZE);
+
+ memcpy (meter->priv->uniform_sample, SAMPLE (0), SAMPLE_SIZE);
+ }
+ else
+ {
+ g_clear_pointer (&meter->priv->uniform_sample, g_free);
+ }
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ if (redraw)
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+gimp_meter_clear_history_unlocked (GimpMeter *meter)
+{
+ meter->priv->current_time = g_get_monotonic_time ();
+ meter->priv->last_sample_time = meter->priv->current_time /
+ meter->priv->sample_duration;
+
+ memset (meter->priv->samples, 0, meter->priv->n_samples * SAMPLE_SIZE);
+
+ g_clear_pointer (&meter->priv->uniform_sample, g_free);
+}
+
+static void
+gimp_meter_update_samples (GimpMeter *meter)
+{
+ meter->priv->n_samples = ceil (meter->priv->history_duration /
+ meter->priv->history_resolution) + 4;
+
+ meter->priv->samples = g_renew (gdouble, meter->priv->samples,
+ meter->priv->n_samples *
+ meter->priv->n_values);
+
+ meter->priv->sample_duration = ROUND (meter->priv->history_resolution *
+ G_TIME_SPAN_SECOND);
+
+ gimp_meter_clear_history_unlocked (meter);
+}
+
+static void
+gimp_meter_shift_samples (GimpMeter *meter)
+{
+ gint64 time;
+ gint n_new_samples;
+
+ meter->priv->current_time = g_get_monotonic_time ();
+
+ time = meter->priv->current_time / meter->priv->sample_duration;
+
+ n_new_samples = MIN (time - meter->priv->last_sample_time,
+ meter->priv->n_samples - 1);
+
+ memmove (SAMPLE (n_new_samples), SAMPLE (0),
+ (meter->priv->n_samples - n_new_samples) * SAMPLE_SIZE);
+ gegl_memset_pattern (SAMPLE (0), SAMPLE (n_new_samples), SAMPLE_SIZE,
+ n_new_samples);
+
+ meter->priv->last_sample_time = time;
+}
+
+
+/* public functions */
+
+
+GtkWidget *
+gimp_meter_new (gint n_values)
+{
+ return g_object_new (GIMP_TYPE_METER,
+ "n-values", n_values,
+ NULL);
+}
+
+void
+gimp_meter_set_size (GimpMeter *meter,
+ gint size)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (size > 0);
+
+ if (size != meter->priv->size)
+ {
+ meter->priv->size = size;
+
+ gtk_widget_queue_resize (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "size");
+ }
+}
+
+gint
+gimp_meter_get_size (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0);
+
+ return meter->priv->size;
+}
+
+void
+gimp_meter_set_refresh_rate (GimpMeter *meter,
+ gdouble rate)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (rate > 0.0);
+
+ if (rate != meter->priv->refresh_rate)
+ {
+ meter->priv->refresh_rate = rate;
+
+ if (meter->priv->timeout_id)
+ {
+ gint interval = ROUND (1000.0 / meter->priv->refresh_rate);
+
+ g_source_remove (meter->priv->timeout_id);
+
+ meter->priv->timeout_id = g_timeout_add (interval,
+ (GSourceFunc) gimp_meter_timeout,
+ meter);
+ }
+
+ g_object_notify (G_OBJECT (meter), "refresh-rate");
+ }
+}
+
+gdouble
+gimp_meter_get_refresh_rate (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0);
+
+ return meter->priv->refresh_rate;
+}
+
+void
+gimp_meter_set_range (GimpMeter *meter,
+ gdouble min,
+ gdouble max)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (min <= max);
+
+ if (min != meter->priv->range_min)
+ {
+ g_mutex_lock (&meter->priv->mutex);
+
+ meter->priv->range_min = min;
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "range-min");
+ }
+
+ if (max != meter->priv->range_max)
+ {
+ g_mutex_lock (&meter->priv->mutex);
+
+ meter->priv->range_max = max;
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "range-max");
+ }
+}
+
+gdouble
+gimp_meter_get_range_min (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0.0);
+
+ return meter->priv->range_min;
+}
+
+gdouble
+gimp_meter_get_range_max (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0.0);
+
+ return meter->priv->range_max;
+}
+
+void
+gimp_meter_set_n_values (GimpMeter *meter,
+ gint n_values)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (n_values >= 0);
+
+ if (n_values != meter->priv->n_values)
+ {
+ g_mutex_lock (&meter->priv->mutex);
+
+ meter->priv->colors = g_renew (GimpRGB, meter->priv->colors, n_values);
+
+ if (n_values > meter->priv->n_values)
+ {
+ memset (meter->priv->colors,
+ 0, (n_values - meter->priv->n_values) * sizeof (GimpRGB));
+ }
+
+ meter->priv->n_values = n_values;
+
+ gimp_meter_update_samples (meter);
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "n-values");
+ }
+}
+
+gint
+gimp_meter_get_n_values (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0);
+
+ return meter->priv->n_values;
+}
+
+void
+gimp_meter_set_color (GimpMeter *meter,
+ gint i,
+ const GimpRGB *color)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (i >= 0 && i < meter->priv->n_values);
+ g_return_if_fail (color != NULL);
+
+ meter->priv->colors[i] = *color;
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+}
+
+const GimpRGB *
+gimp_meter_get_color (GimpMeter *meter,
+ gint i)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), NULL);
+ g_return_val_if_fail (i >= 0 && i < meter->priv->n_values, NULL);
+
+ return &meter->priv->colors[i];
+}
+
+void
+gimp_meter_set_history_visible (GimpMeter *meter,
+ gboolean visible)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+
+ if (visible != meter->priv->history_visible)
+ {
+ meter->priv->history_visible = visible;
+
+ gtk_widget_queue_resize (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "history-visible");
+ }
+}
+
+gboolean
+gimp_meter_get_history_visible (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), FALSE);
+
+ return meter->priv->history_visible;
+}
+
+void
+gimp_meter_set_history_duration (GimpMeter *meter,
+ gdouble duration)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (duration >= 0.0);
+
+ if (duration != meter->priv->history_duration)
+ {
+ g_mutex_lock (&meter->priv->mutex);
+
+ meter->priv->history_duration = duration;
+
+ gimp_meter_update_samples (meter);
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ g_object_notify (G_OBJECT (meter), "history-duration");
+ }
+}
+
+gdouble
+gimp_meter_get_history_duration (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0.0);
+
+ return meter->priv->history_duration;
+}
+
+void
+gimp_meter_set_history_resolution (GimpMeter *meter,
+ gdouble resolution)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (resolution > 0.0);
+
+ if (resolution != meter->priv->history_resolution)
+ {
+ g_mutex_lock (&meter->priv->mutex);
+
+ meter->priv->history_resolution = resolution;
+
+ gimp_meter_update_samples (meter);
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ g_object_notify (G_OBJECT (meter), "history-resolution");
+ }
+}
+
+gdouble
+gimp_meter_get_history_resolution (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), 0.0);
+
+ return meter->priv->history_resolution;
+}
+
+void
+gimp_meter_clear_history (GimpMeter *meter)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+
+ g_mutex_lock (&meter->priv->mutex);
+
+ gimp_meter_clear_history_unlocked (meter);
+
+ g_mutex_unlock (&meter->priv->mutex);
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+}
+
+void
+gimp_meter_add_sample (GimpMeter *meter,
+ const gdouble *sample)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (sample != NULL || meter->priv->n_values == 0);
+
+ g_mutex_lock (&meter->priv->mutex);
+
+ gimp_meter_shift_samples (meter);
+
+ memcpy (SAMPLE (0), sample, SAMPLE_SIZE);
+
+ g_mutex_unlock (&meter->priv->mutex);
+}
+
+void
+gimp_meter_set_led_visible (GimpMeter *meter,
+ gboolean visible)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+
+ if (visible != meter->priv->led_visible)
+ {
+ meter->priv->led_visible = visible;
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "led-visible");
+ }
+}
+
+gboolean
+gimp_meter_get_led_visible (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), FALSE);
+
+ return meter->priv->led_visible;
+}
+
+void
+gimp_meter_set_led_color (GimpMeter *meter,
+ const GimpRGB *color)
+{
+ g_return_if_fail (GIMP_IS_METER (meter));
+ g_return_if_fail (color != NULL);
+
+ meter->priv->led_color = *color;
+
+ gtk_widget_queue_draw (GTK_WIDGET (meter));
+
+ g_object_notify (G_OBJECT (meter), "led-color");
+}
+
+const GimpRGB *
+gimp_meter_get_led_color (GimpMeter *meter)
+{
+ g_return_val_if_fail (GIMP_IS_METER (meter), NULL);
+
+ return &meter->priv->led_color;
+}
diff --git a/app/widgets/gimpmeter.h b/app/widgets/gimpmeter.h
new file mode 100644
index 0000000..25b55de
--- /dev/null
+++ b/app/widgets/gimpmeter.h
@@ -0,0 +1,103 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpmeter.h
+ * Copyright (C) 2017 Ell
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_METER_H__
+#define __GIMP_METER_H__
+
+
+#define GIMP_TYPE_METER (gimp_meter_get_type ())
+#define GIMP_METER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_METER, GimpMeter))
+#define GIMP_METER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_METER, GimpMeterClass))
+#define GIMP_IS_METER(obj) (G_TYPE_CHECK_INSTANCE_TYPE (obj, GIMP_TYPE_METER))
+#define GIMP_IS_METER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_METER))
+#define GIMP_METER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_METER, GimpMeterClass))
+
+
+typedef struct _GimpMeterPrivate GimpMeterPrivate;
+typedef struct _GimpMeterClass GimpMeterClass;
+
+struct _GimpMeter
+{
+ GtkWidget parent_instance;
+
+ GimpMeterPrivate *priv;
+};
+
+struct _GimpMeterClass
+{
+ GtkWidgetClass parent_class;
+};
+
+
+GType gimp_meter_get_type (void) G_GNUC_CONST;
+
+GtkWidget * gimp_meter_new (gint n_values);
+
+void gimp_meter_set_size (GimpMeter *meter,
+ gint size);
+gint gimp_meter_get_size (GimpMeter *meter);
+
+void gimp_meter_set_refresh_rate (GimpMeter *meter,
+ gdouble rate);
+gdouble gimp_meter_get_refresh_rate (GimpMeter *meter);
+
+void gimp_meter_set_range (GimpMeter *meter,
+ gdouble min,
+ gdouble max);
+gdouble gimp_meter_get_range_min (GimpMeter *meter);
+gdouble gimp_meter_get_range_max (GimpMeter *meter);
+
+void gimp_meter_set_n_values (GimpMeter *meter,
+ gint n_values);
+gint gimp_meter_get_n_values (GimpMeter *meter);
+
+void gimp_meter_set_color (GimpMeter *meter,
+ gint i,
+ const GimpRGB *color);
+const GimpRGB * gimp_meter_get_color (GimpMeter *meter,
+ gint i);
+
+void gimp_meter_set_history_visible (GimpMeter *meter,
+ gboolean visible);
+gboolean gimp_meter_get_history_visible (GimpMeter *meter);
+
+void gimp_meter_set_history_duration (GimpMeter *meter,
+ gdouble duration);
+gdouble gimp_meter_get_history_duration (GimpMeter *meter);
+
+void gimp_meter_set_history_resolution (GimpMeter *meter,
+ gdouble resolution);
+gdouble gimp_meter_get_history_resolution (GimpMeter *meter);
+
+void gimp_meter_clear_history (GimpMeter *meter);
+
+void gimp_meter_add_sample (GimpMeter *meter,
+ const gdouble *sample);
+
+void gimp_meter_set_led_visible (GimpMeter *meter,
+ gboolean visible);
+gboolean gimp_meter_get_led_visible (GimpMeter *meter);
+
+void gimp_meter_set_led_color (GimpMeter *meter,
+ const GimpRGB *color);
+const GimpRGB * gimp_meter_get_led_color (GimpMeter *meter);
+
+
+#endif /* __GIMP_METER_H__ */
diff --git a/app/widgets/widgets-types.h b/app/widgets/widgets-types.h
index 5661fd2..63a6fe5 100644
--- a/app/widgets/widgets-types.h
+++ b/app/widgets/widgets-types.h
@@ -202,6 +202,7 @@ typedef struct _GimpLanguageStore GimpLanguageStore;
typedef struct _GimpLayerModeBox GimpLayerModeBox;
typedef struct _GimpLayerModeComboBox GimpLayerModeComboBox;
typedef struct _GimpMessageBox GimpMessageBox;
+typedef struct _GimpMeter GimpMeter;
typedef struct _GimpOverlayBox GimpOverlayBox;
typedef struct _GimpPickableButton GimpPickableButton;
typedef struct _GimpPickablePopup GimpPickablePopup;
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