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[gnome-color-manager: 3/3] Add a simple tone curve widget that is not used just yet

commit e9cfd20d840c31a3ce753b427c16b5a8f798f138
Author: Richard Hughes <richard hughsie com>
Date:   Wed Dec 9 20:03:42 2009 +0000

    Add a simple tone curve widget that is not used just yet

 data/tests/trc-widget.png |  Bin 0 -> 13194 bytes
 src/Makefile.am           |    2 +
 src/gcm-self-test.c       |    2 +
 src/gcm-trc-widget.c      |  463 +++++++++++++++++++++++++++++++++++++++++++++
 src/gcm-trc-widget.h      |   56 ++++++
 5 files changed, 523 insertions(+), 0 deletions(-)
---
diff --git a/data/tests/trc-widget.png b/data/tests/trc-widget.png
new file mode 100644
index 0000000..fe6dbb1
Binary files /dev/null and b/data/tests/trc-widget.png differ
diff --git a/src/Makefile.am b/src/Makefile.am
index d46fa3a..f819361 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -191,6 +191,8 @@ gcm_self_test_SOURCES =					\
 	gcm-dmi.c					\
 	gcm-xyz.c					\
 	gcm-cie-widget.c				\
+	gcm-trc-widget.c				\
+	gcm-trc-widget.h				\
 	egg-test.h					\
 	egg-test.c					\
 	$(NULL)
diff --git a/src/gcm-self-test.c b/src/gcm-self-test.c
index 1c2f1fc..c3d42a7 100644
--- a/src/gcm-self-test.c
+++ b/src/gcm-self-test.c
@@ -34,6 +34,7 @@ void gcm_clut_test (EggTest *test);
 void gcm_dmi_test (EggTest *test);
 void gcm_xyz_test (EggTest *test);
 void gcm_cie_widget_test (EggTest *test);
+void gcm_trc_widget_test (EggTest *test);
 
 int
 main (int argc, char **argv)
@@ -47,6 +48,7 @@ main (int argc, char **argv)
 	egg_debug_init (&argc, &argv);
 
 	/* components */
+	gcm_trc_widget_test (test);
 	gcm_edid_test (test);
 	gcm_tables_test (test);
 	gcm_utils_test (test);
diff --git a/src/gcm-trc-widget.c b/src/gcm-trc-widget.c
new file mode 100644
index 0000000..4bfe05b
--- /dev/null
+++ b/src/gcm-trc-widget.c
@@ -0,0 +1,463 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2006-2009 Richard Hughes <richard hughsie com>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include <gtk/gtk.h>
+#include <glib/gi18n.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include "gcm-clut.h"
+#include "gcm-trc-widget.h"
+
+#include "egg-debug.h"
+
+G_DEFINE_TYPE (GcmTrcWidget, gcm_trc_widget, GTK_TYPE_DRAWING_AREA);
+#define GCM_TRC_WIDGET_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GCM_TYPE_TRC_WIDGET, GcmTrcWidgetPrivate))
+#define GCM_TRC_WIDGET_FONT "Sans 8"
+
+struct GcmTrcWidgetPrivate
+{
+	gboolean		 use_grid;
+	guint			 chart_width;
+	guint			 chart_height;
+	cairo_t			*cr;
+	PangoLayout		*layout;
+	GPtrArray		*clut_data;
+	GcmClutData		*data;
+	guint			 x_offset;
+	guint			 y_offset;
+};
+
+static gboolean gcm_trc_widget_expose (GtkWidget *trc, GdkEventExpose *event);
+static void	gcm_trc_widget_finalize (GObject *object);
+
+enum
+{
+	PROP_0,
+	PROP_USE_GRID,
+	PROP_RED,
+	PROP_GREEN,
+	PROP_BLUE,
+	PROP_WHITE,
+	PROP_LAST
+};
+
+/**
+ * dkp_trc_get_property:
+ **/
+static void
+dkp_trc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+	GcmTrcWidget *trc = GCM_TRC_WIDGET (object);
+	switch (prop_id) {
+	case PROP_USE_GRID:
+		g_value_set_boolean (value, trc->priv->use_grid);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+		break;
+	}
+}
+
+/**
+ * dkp_trc_set_property:
+ **/
+static void
+dkp_trc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+	GcmTrcWidget *trc = GCM_TRC_WIDGET (object);
+
+	switch (prop_id) {
+	case PROP_USE_GRID:
+		trc->priv->use_grid = g_value_get_boolean (value);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+		break;
+	}
+
+	/* refresh widget */
+	gtk_widget_hide (GTK_WIDGET (trc));
+	gtk_widget_show (GTK_WIDGET (trc));
+}
+
+/**
+ * gcm_trc_widget_class_init:
+ **/
+static void
+gcm_trc_widget_class_init (GcmTrcWidgetClass *class)
+{
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+	GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+	widget_class->expose_event = gcm_trc_widget_expose;
+	object_class->get_property = dkp_trc_get_property;
+	object_class->set_property = dkp_trc_set_property;
+	object_class->finalize = gcm_trc_widget_finalize;
+
+	g_type_class_add_private (class, sizeof (GcmTrcWidgetPrivate));
+
+	/* properties */
+	g_object_class_install_property (object_class,
+					 PROP_USE_GRID,
+					 g_param_spec_boolean ("use-grid", NULL, NULL,
+							       TRUE,
+							       G_PARAM_READWRITE));
+	g_object_class_install_property (object_class,
+					 PROP_RED,
+					 g_param_spec_object ("red", NULL, NULL,
+							      G_TYPE_OBJECT,
+							      G_PARAM_WRITABLE));
+}
+
+/**
+ * gcm_trc_widget_init:
+ **/
+static void
+gcm_trc_widget_init (GcmTrcWidget *trc)
+{
+	PangoFontMap *fontmap;
+	PangoContext *context;
+	PangoFontDescription *desc;
+
+	trc->priv = GCM_TRC_WIDGET_GET_PRIVATE (trc);
+	trc->priv->use_grid = TRUE;
+	trc->priv->clut_data = g_ptr_array_new_with_free_func (g_free);
+
+	/* do pango stuff */
+	fontmap = pango_cairo_font_map_get_default ();
+	context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
+	pango_context_set_base_gravity (context, PANGO_GRAVITY_AUTO);
+
+	trc->priv->layout = pango_layout_new (context);
+	desc = pango_font_description_from_string (GCM_TRC_WIDGET_FONT);
+	pango_layout_set_font_description (trc->priv->layout, desc);
+	pango_font_description_free (desc);
+}
+
+/**
+ * gcm_trc_widget_finalize:
+ **/
+static void
+gcm_trc_widget_finalize (GObject *object)
+{
+	PangoContext *context;
+	GcmTrcWidget *trc = (GcmTrcWidget*) object;
+
+	context = pango_layout_get_context (trc->priv->layout);
+	g_object_unref (trc->priv->layout);
+	g_object_unref (context);
+	g_ptr_array_unref (trc->priv->clut_data);
+	G_OBJECT_CLASS (gcm_trc_widget_parent_class)->finalize (object);
+}
+
+/**
+ * gcm_trc_widget_draw_grid:
+ *
+ * Draw the 10x10 dotted grid onto the trc.
+ **/
+static void
+gcm_trc_widget_draw_grid (GcmTrcWidget *trc, cairo_t *cr)
+{
+	guint i;
+	gdouble b;
+	gdouble dotted[] = {1., 2.};
+	gdouble divwidth  = (gdouble)trc->priv->chart_width / 10.0f;
+	gdouble divheight = (gdouble)trc->priv->chart_height / 10.0f;
+
+	cairo_save (cr);
+	cairo_set_line_width (cr, 1);
+	cairo_set_dash (cr, dotted, 2, 0.0);
+
+	/* do vertical lines */
+	cairo_set_source_rgb (cr, 0.1, 0.1, 0.1);
+	for (i=1; i<10; i++) {
+		b = ((gdouble) i * divwidth);
+		cairo_move_to (cr, (gint)b + 0.5f, 0);
+		cairo_line_to (cr, (gint)b + 0.5f, trc->priv->chart_height);
+		cairo_stroke (cr);
+	}
+
+	/* do horizontal lines */
+	for (i=1; i<10; i++) {
+		b = ((gdouble) i * divheight);
+		cairo_move_to (cr, 0, (gint)b + 0.5f);
+		cairo_line_to (cr, trc->priv->chart_width, (int)b + 0.5f);
+		cairo_stroke (cr);
+	}
+
+	cairo_restore (cr);
+}
+
+/**
+ * gcm_trc_widget_map_to_display:
+ **/
+static void
+gcm_trc_widget_map_to_display (GcmTrcWidget *trc, gdouble x, gdouble y, gdouble *x_retval, gdouble *y_retval)
+{
+	GcmTrcWidgetPrivate *priv = trc->priv;
+
+	*x_retval = (x * (priv->chart_width - 1)) + priv->x_offset;
+	*y_retval = ((priv->chart_height - 1) - y * (priv->chart_height - 1)) - priv->y_offset;
+}
+
+/**
+ * gcm_trc_widget_map_from_display:
+ **/
+static void
+gcm_trc_widget_map_from_display (GcmTrcWidget *trc, gdouble x, gdouble y, gdouble *x_retval, gdouble *y_retval)
+{
+	GcmTrcWidgetPrivate *priv = trc->priv;
+
+	*x_retval = ((gdouble) x - priv->x_offset) / (priv->chart_width - 1);
+	*y_retval = 1.0 - ((gdouble) y + priv->y_offset) / (priv->chart_height - 1);
+}
+
+/**
+ * gcm_trc_widget_draw_line:
+ **/
+static void
+gcm_trc_widget_draw_line (GcmTrcWidget *trc, cairo_t *cr)
+{
+	gdouble wx, wy;
+	GcmTrcWidgetPrivate *priv = trc->priv;
+	GcmClutData tmp;
+	gfloat i;
+	gfloat value;
+	const gfloat size = 256.0f;
+
+	cairo_save (cr);
+
+
+	/* do red */
+	cairo_set_line_width (cr, 3);
+	cairo_set_source_rgb (cr, 0.5f, 0.0f, 0.0f);
+	for (i=0; i<size; i++) {
+		tmp = priv->data[(guint)i];
+		value = tmp.red/65536.0f;
+		gcm_trc_widget_map_to_display (trc, i/size, value, &wx, &wy);
+		if (i == 0)
+			cairo_move_to (cr, wx, wy);
+		else
+			cairo_line_to (cr, wx, wy);
+	}
+	cairo_stroke_preserve (cr);
+	cairo_set_line_width (cr, 2);
+	cairo_set_source_rgb (cr, 1.0f, 0.0f, 0.0f);
+	cairo_stroke (cr);
+
+	/* do green */
+	cairo_set_line_width (cr, 3);
+	cairo_set_source_rgb (cr, 0.0f, 0.5f, 0.0f);
+	for (i=0; i<size; i++) {
+		tmp = priv->data[(guint)i];
+		value = tmp.green/65536.0f;
+		gcm_trc_widget_map_to_display (trc, i/size, value, &wx, &wy);
+		if (i == 0)
+			cairo_move_to (cr, wx, wy);
+		else
+			cairo_line_to (cr, wx, wy);
+	}
+	cairo_stroke_preserve (cr);
+	cairo_set_line_width (cr, 2);
+	cairo_set_source_rgb (cr, 0.0f, 1.0f, 0.0f);
+	cairo_stroke (cr);
+
+	/* do blue */
+	cairo_set_line_width (cr, 3);
+	cairo_set_source_rgb (cr, 0.0f, 0.0f, 0.5f);
+	for (i=0; i<size; i++) {
+		tmp = priv->data[(guint)i];
+		value = tmp.blue/65536.0f;
+		gcm_trc_widget_map_to_display (trc, i/size, value, &wx, &wy);
+		if (i == 0)
+			cairo_move_to (cr, wx, wy);
+		else
+			cairo_line_to (cr, wx, wy);
+	}
+	cairo_stroke_preserve (cr);
+	cairo_set_line_width (cr, 2);
+	cairo_set_source_rgb (cr, 0.0f, 0.0f, 1.0f);
+	cairo_stroke (cr);
+
+	cairo_restore (cr);
+}
+
+/**
+ * gcm_trc_widget_draw_bounding_box:
+ **/
+static void
+gcm_trc_widget_draw_bounding_box (cairo_t *cr, gint x, gint y, gint width, gint height)
+{
+	/* background */
+	cairo_rectangle (cr, x, y, width, height);
+	cairo_set_source_rgb (cr, 1, 1, 1);
+	cairo_fill (cr);
+
+	/* solid outline box */
+	cairo_rectangle (cr, x + 0.5f, y + 0.5f, width - 1, height - 1);
+	cairo_set_source_rgb (cr, 0.1, 0.1, 0.1);
+	cairo_set_line_width (cr, 1);
+	cairo_stroke (cr);
+}
+
+/**
+ * gcm_trc_widget_draw_trc:
+ *
+ * Draw the complete trc, with the box, the grid, the horseshoe and the shading.
+ **/
+static void
+gcm_trc_widget_draw_trc (GtkWidget *trc_widget, cairo_t *cr)
+{
+	GtkAllocation allocation;
+
+	GcmTrcWidget *trc = (GcmTrcWidget*) trc_widget;
+	g_return_if_fail (trc != NULL);
+	g_return_if_fail (GCM_IS_TRC_WIDGET (trc));
+
+	cairo_save (cr);
+
+	/* make size adjustment */
+	gtk_widget_get_allocation (trc_widget, &allocation);
+	trc->priv->chart_height = allocation.height;
+	trc->priv->chart_width = allocation.width;
+	trc->priv->x_offset = 1;
+	trc->priv->y_offset = 1;
+
+	/* trc background */
+	gcm_trc_widget_draw_bounding_box (cr, 0, 0, trc->priv->chart_width, trc->priv->chart_height);
+	if (trc->priv->use_grid)
+		gcm_trc_widget_draw_grid (trc, cr);
+
+	gcm_trc_widget_draw_line (trc, cr);
+
+	cairo_restore (cr);
+}
+
+/**
+ * gcm_trc_widget_expose:
+ *
+ * Just repaint the entire trc widget on expose.
+ **/
+static gboolean
+gcm_trc_widget_expose (GtkWidget *trc, GdkEventExpose *event)
+{
+	cairo_t *cr;
+
+	/* get a cairo_t */
+	cr = gdk_cairo_create (gtk_widget_get_window (trc));
+	cairo_rectangle (cr,
+			 event->area.x, event->area.y,
+			 event->area.width, event->area.height);
+	cairo_clip (cr);
+	((GcmTrcWidget *)trc)->priv->cr = cr;
+
+	gcm_trc_widget_draw_trc (trc, cr);
+
+	cairo_destroy (cr);
+	return FALSE;
+}
+
+/**
+ * gcm_trc_widget_new:
+ * Return value: A new GcmTrcWidget object.
+ **/
+GtkWidget *
+gcm_trc_widget_new (void)
+{
+	return g_object_new (GCM_TYPE_TRC_WIDGET, NULL);
+}
+
+/***************************************************************************
+ ***                          MAKE CHECK TESTS                           ***
+ ***************************************************************************/
+#ifdef EGG_TEST
+#include "egg-test.h"
+
+#include "gcm-profile.h"
+#include "gcm-xyz.h"
+
+void
+gcm_trc_widget_test (EggTest *test)
+{
+	GtkWidget *widget;
+	GtkWidget *image;
+	GtkWidget *dialog;
+	GtkWidget *vbox;
+	gboolean ret;
+	GError *error = NULL;
+	GcmProfile *profile;
+	gint response;
+	gchar *filename_profile;
+	gchar *filename_image;
+	GcmClutData *data;
+
+	if (!egg_test_start (test, "GcmTrcWidget"))
+		return;
+
+	/************************************************************/
+	egg_test_title (test, "get a TRC widget object");
+	widget = gcm_trc_widget_new ();
+	egg_test_assert (test, widget != NULL);
+
+	/************************************************************/
+	egg_test_title (test, "get filename of image file");
+	filename_image = egg_test_get_data_file ("trc-widget.png");
+	egg_test_assert (test, (filename_image != NULL));
+
+	/************************************************************/
+	egg_test_title (test, "get filename of data file");
+	filename_profile = egg_test_get_data_file ("AdobeGammaTest.icm");
+	egg_test_assert (test, (filename_profile != NULL));
+
+	profile = gcm_profile_new ();
+	gcm_profile_parse (profile, filename_profile, NULL);
+
+	((GcmTrcWidget*)widget)->priv->data = gcm_profile_generate (profile, 256);
+
+	/* show in a dialog as an example */
+	dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, "Does TRC widget match\nthe picture below?");
+	image = gtk_image_new_from_file (filename_image);
+	vbox = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
+	gtk_box_pack_end (GTK_BOX(vbox), widget, TRUE, TRUE, 12);
+	gtk_box_pack_end (GTK_BOX(vbox), image, TRUE, TRUE, 12);
+	gtk_widget_set_size_request (widget, 300, 300);
+	gtk_window_set_resizable (GTK_WINDOW (dialog), TRUE);
+	gtk_widget_show (widget);
+	gtk_widget_show (image);
+
+	response = gtk_dialog_run (GTK_DIALOG (dialog));
+
+	/************************************************************/
+	egg_test_title (test, "plotted as expected?");
+	egg_test_assert (test, (response == GTK_RESPONSE_YES));
+
+	gtk_widget_destroy (dialog);
+
+	g_object_unref (profile);
+	g_free (filename_profile);
+	g_free (filename_image);
+
+	egg_test_end (test);
+}
+#endif
+
diff --git a/src/gcm-trc-widget.h b/src/gcm-trc-widget.h
new file mode 100644
index 0000000..eb6c118
--- /dev/null
+++ b/src/gcm-trc-widget.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2006-2009 Richard Hughes <richard hughsie com>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GCM_TRC_WIDGET_H__
+#define __GCM_TRC_WIDGET_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GCM_TYPE_TRC_WIDGET		(gcm_trc_widget_get_type ())
+#define GCM_TRC_WIDGET(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GCM_TYPE_TRC_WIDGET, GcmTrcWidget))
+#define GCM_TRC_WIDGET_CLASS(obj)	(G_TYPE_CHECK_CLASS_CAST ((obj), GCM_TRC_WIDGET, GcmTrcWidgetClass))
+#define GCM_IS_TRC_WIDGET(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GCM_TYPE_TRC_WIDGET))
+#define GCM_IS_TRC_WIDGET_CLASS(obj)	(G_TYPE_CHECK_CLASS_TYPE ((obj), EFF_TYPE_TRC_WIDGET))
+#define GCM_TRC_WIDGET_GET_CLASS	(G_TYPE_INSTANCE_GET_CLASS ((obj), GCM_TYPE_TRC_WIDGET, GcmTrcWidgetClass))
+
+typedef struct GcmTrcWidget		GcmTrcWidget;
+typedef struct GcmTrcWidgetClass	GcmTrcWidgetClass;
+typedef struct GcmTrcWidgetPrivate	GcmTrcWidgetPrivate;
+
+struct GcmTrcWidget
+{
+	GtkDrawingArea		 parent;
+	GcmTrcWidgetPrivate	*priv;
+};
+
+struct GcmTrcWidgetClass
+{
+	GtkDrawingAreaClass parent_class;
+};
+
+GType		 gcm_trc_widget_get_type		(void);
+GtkWidget	*gcm_trc_widget_new			(void);
+
+G_END_DECLS
+
+#endif
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