--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+/**
+ * SECTION:clutter-desaturate-effect
+ * @short_description: A desaturation effect
+ * @see_also: #ClutterEffect, #ClutterOffscreenEffect
+ *
+ * #ClutterColorizeEffect is a sub-class of #ClutterEffect that
+ * colorizes an actor with the given tint.
+ *
+ * #ClutterColorizeEffect uses the programmable pipeline of the GPU
+ * so it is only available on graphics hardware that supports this
+ * feature.
+ *
+ * #ClutterColorizeEffect is available since Clutter 1.4
+ */
+
+#define CLUTTER_COLORIZE_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_COLORIZE_EFFECT, ClutterColorizeEffectClass))
+#define CLUTTER_IS_COLORIZE_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_COLORIZE_EFFECT))
+#define CLUTTER_COLORIZE_EFFECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_COLORIZE_EFFECT, ClutterColorizeEffectClass))
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "clutter-colorize-effect.h"
+
+#include "cogl/cogl.h"
+
+#include "clutter-debug.h"
+#include "clutter-enum-types.h"
+#include "clutter-private.h"
+#include "clutter-shader-effect.h"
+
+typedef struct _ClutterColorizeEffectClass ClutterColorizeEffectClass;
+
+struct _ClutterColorizeEffect
+{
+ ClutterShaderEffect parent_instance;
+
+ /* a back pointer to our actor, so that we can query it */
+ ClutterActor *actor;
+
+ /* the tint of the colorization */
+ ClutterColor tint;
+
+ guint source_set : 1;
+};
+
+struct _ClutterColorizeEffectClass
+{
+ ClutterShaderEffectClass parent_class;
+};
+
+/* the magic gray vec3 has been taken from the NTSC conversion weights
+ * as defined by:
+ *
+ * "OpenGL Superbible, 4th Edition"
+ * -- Richard S. Wright Jr, Benjamin Lipchak, Nicholas Haemel
+ * Addison-Wesley
+ */
+static const gchar *colorize_glsl_shader =
+"uniform sampler2D tex;\n"
+"uniform vec3 tint;\n"
+"\n"
+"void main ()\n"
+"{\n"
+" vec4 color = gl_Color * texture2D (tex, vec2 (gl_TexCoord[0].xy));\n"
+" float gray = dot (color.rgb, vec3 (0.299, 0.587, 0.114));\n"
+" gl_FragColor = vec4 (gray * tint, color.a);\n"
+"}\n";
+
+/* a lame sepia */
+static const ClutterColor default_tint = { 255, 204, 153, 255 };
+
+enum
+{
+ PROP_0,
+
+ PROP_TINT
+};
+
+G_DEFINE_TYPE (ClutterColorizeEffect,
+ clutter_colorize_effect,
+ CLUTTER_TYPE_SHADER_EFFECT);
+
+static gboolean
+clutter_colorize_effect_pre_paint (ClutterEffect *effect)
+{
+ ClutterColorizeEffect *self = CLUTTER_COLORIZE_EFFECT (effect);
+ ClutterShaderEffect *shader_effect;
+ ClutterEffectClass *parent_class;
+ float tint_r, tint_g, tint_b;
+
+ shader_effect = CLUTTER_SHADER_EFFECT (effect);
+ if (!self->source_set)
+ {
+ CoglHandle shader = clutter_shader_effect_get_shader (shader_effect);
+
+ if (shader == COGL_INVALID_HANDLE)
+ return FALSE;
+
+ cogl_shader_source (shader, colorize_glsl_shader);
+ self->source_set = TRUE;
+ }
+
+ /* we want normalized values here */
+ tint_r = self->tint.red / 255.0f;
+ tint_g = self->tint.green / 255.0f;
+ tint_b = self->tint.blue / 255.0f;
+
+ /* bind the uniforms to the factor property */
+ clutter_shader_effect_set_uniform (shader_effect,
+ "tex",
+ G_TYPE_INT, 1,
+ 0);
+ clutter_shader_effect_set_uniform (shader_effect,
+ "tint",
+ G_TYPE_FLOAT, 3,
+ tint_r,
+ tint_g,
+ tint_b);
+
+ parent_class = CLUTTER_EFFECT_CLASS (clutter_colorize_effect_parent_class);
+ return parent_class->pre_paint (effect);
+}
+
+static void
+clutter_colorize_effect_finalize (GObject *gobject)
+{
+ G_OBJECT_CLASS (clutter_colorize_effect_parent_class)->finalize (gobject);
+}
+
+static void
+clutter_colorize_effect_set_property (GObject *gobject,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ ClutterColorizeEffect *effect = CLUTTER_COLORIZE_EFFECT (gobject);
+
+ switch (prop_id)
+ {
+ case PROP_TINT:
+ clutter_colorize_effect_set_tint (effect,
+ clutter_value_get_color (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+clutter_colorize_effect_get_property (GObject *gobject,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ ClutterColorizeEffect *effect = CLUTTER_COLORIZE_EFFECT (gobject);
+
+ switch (prop_id)
+ {
+ case PROP_TINT:
+ clutter_value_set_color (value, &effect->tint);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+clutter_colorize_effect_class_init (ClutterColorizeEffectClass *klass)
+{
+ ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+ GParamSpec *pspec;
+
+ effect_class->pre_paint = clutter_colorize_effect_pre_paint;
+
+ gobject_class->set_property = clutter_colorize_effect_set_property;
+ gobject_class->get_property = clutter_colorize_effect_get_property;
+ gobject_class->finalize = clutter_colorize_effect_finalize;
+
+ /**
+ * ClutterColorizeEffect:tint:
+ *
+ * The tint to apply to the actor
+ *
+ * Since: 1.4
+ */
+ pspec = clutter_param_spec_color ("tint",
+ "Tint",
+ "The tint to apply",
+ &default_tint,
+ CLUTTER_PARAM_READWRITE);
+ g_object_class_install_property (gobject_class, PROP_TINT, pspec);
+}
+
+static void
+clutter_colorize_effect_init (ClutterColorizeEffect *self)
+{
+ self->tint = default_tint;
+}
+
+/**
+ * clutter_colorize_effect_new:
+ * @tint: the color to be used
+ *
+ * Creates a new #ClutterColorizeEffect to be used with
+ * clutter_actor_set_effect()
+ *
+ * Return value: the newly created #ClutterColorizeEffect or %NULL
+ *
+ * Since: 1.4
+ */
+ClutterEffect *
+clutter_colorize_effect_new (const ClutterColor *tint)
+{
+ return g_object_new (CLUTTER_TYPE_COLORIZE_EFFECT,
+ "tint", tint,
+ NULL);
+}
+
+/**
+ * clutter_colorize_effect_set_tint:
+ * @effect: a #ClutterColorizeEffect
+ * @tint: the color to be used
+ *
+ * Sets the tint to be used when colorizing
+ *
+ * Since: 1.4
+ */
+void
+clutter_colorize_effect_set_tint (ClutterColorizeEffect *effect,
+ const ClutterColor *tint)
+{
+ g_return_if_fail (CLUTTER_IS_COLORIZE_EFFECT (effect));
+
+ effect->tint = *tint;
+
+ if (effect->actor != NULL)
+ clutter_actor_queue_redraw (effect->actor);
+
+ g_object_notify (G_OBJECT (effect), "tint");
+}
+
+/**
+ * clutter_colorize_effect_get_tint:
+ * @effect: a #ClutterColorizeEffect
+ * @tint: (out): return location for the color used
+ *
+ * Retrieves the tint used by @effect
+ *
+ * Since: 1.4
+ */
+void
+clutter_colorize_effect_get_tint (ClutterColorizeEffect *effect,
+ ClutterColor *tint)
+{
+ g_return_if_fail (CLUTTER_IS_COLORIZE_EFFECT (effect));
+ g_return_if_fail (tint != NULL);
+
+ *tint = effect->tint;
+}
--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
+#ifndef __CLUTTER_COLORIZE_EFFECT_H__
+#define __CLUTTER_COLORIZE_EFFECT_H__
+
+#include <clutter/clutter-color.h>
+#include <clutter/clutter-effect.h>
+
+G_BEGIN_DECLS
+
+#define CLUTTER_TYPE_COLORIZE_EFFECT (clutter_colorize_effect_get_type ())
+#define CLUTTER_COLORIZE_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_COLORIZE_EFFECT, ClutterColorizeEffect))
+#define CLUTTER_IS_COLORIZE_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_COLORIZE_EFFECT))
+
+/**
+ * ClutterColorizeEffect:
+ *
+ * <structname>ClutterColorizeEffect</structname> is an opaque structure
+ * whose members cannot be directly accessed
+ *
+ * SinceL 1.4
+ */
+typedef struct _ClutterColorizeEffect ClutterColorizeEffect;
+
+GType clutter_colorize_effect_get_type (void) G_GNUC_CONST;
+
+ClutterEffect *clutter_colorize_effect_new (const ClutterColor *tint);
+
+void clutter_colorize_effect_set_tint (ClutterColorizeEffect *effect,
+ const ClutterColor *tint);
+void clutter_colorize_effect_get_tint (ClutterColorizeEffect *effect,
+ ClutterColor *tint);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_COLORIZE_EFFECT_H__ */
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