diff options
Diffstat (limited to 'clutter/clutter/clutter-brightness-contrast-effect.c')
| -rw-r--r-- | clutter/clutter/clutter-brightness-contrast-effect.c | 623 |
1 files changed, 0 insertions, 623 deletions
diff --git a/clutter/clutter/clutter-brightness-contrast-effect.c b/clutter/clutter/clutter-brightness-contrast-effect.c deleted file mode 100644 index 4f0ce2e5e..000000000 --- a/clutter/clutter/clutter-brightness-contrast-effect.c +++ /dev/null @@ -1,623 +0,0 @@ -/* - * Clutter. - * - * An OpenGL based 'interactive canvas' library. - * - * Copyright (C) 2010-2012 Inclusive Design Research Centre, OCAD University. - * - * 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: - * Joseph Scheuhammer <clown@alum.mit.edu> - */ - -/** - * SECTION:clutter-brightness-contrast-effect - * @short_description: Increase/decrease brightness and/or contrast of actor. - * @see_also: #ClutterEffect, #ClutterOffscreenEffect - * - * #ClutterBrightnessContrastEffect is a sub-class of #ClutterEffect that - * changes the overall brightness of a #ClutterActor. - * - * #ClutterBrightnessContrastEffect is available since Clutter 1.10 - */ - -#define CLUTTER_BRIGHTNESS_CONTRAST_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_BRIGHTNESS_CONTRAST_EFFECT, ClutterBrightnessContrastEffectClass)) -#define CLUTTER_IS_BRIGHTNESS_CONTRAST_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_BRIGHTNESS_CONTRAST_EFFECT)) -#define CLUTTER_BRIGHTNESS_CONTRAST_EFFECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_BRIGHTNESS_CONTRAST_EFFECT, ClutterBrightnessContrastEffectClass)) - -#include "clutter-build-config.h" - -#include <math.h> - -#include "clutter-brightness-contrast-effect.h" - -#include <cogl/cogl.h> - -#include "clutter-debug.h" -#include "clutter-enum-types.h" -#include "clutter-offscreen-effect.h" -#include "clutter-private.h" - -struct _ClutterBrightnessContrastEffect -{ - ClutterOffscreenEffect parent_instance; - - /* Brightness and contrast changes. */ - gfloat brightness_red; - gfloat brightness_green; - gfloat brightness_blue; - - gfloat contrast_red; - gfloat contrast_green; - gfloat contrast_blue; - - gint brightness_multiplier_uniform; - gint brightness_offset_uniform; - gint contrast_uniform; - - CoglPipeline *pipeline; -}; - -struct _ClutterBrightnessContrastEffectClass -{ - ClutterOffscreenEffectClass parent_class; - - CoglPipeline *base_pipeline; -}; - -/* Brightness effects in GLSL. - */ -static const gchar *brightness_contrast_decls = - "uniform vec3 brightness_multiplier;\n" - "uniform vec3 brightness_offset;\n" - "uniform vec3 contrast;\n"; - -static const gchar *brightness_contrast_source = - /* Apply the brightness. The brightness_offset is multiplied by the - alpha to keep the color pre-multiplied */ - "cogl_color_out.rgb = (cogl_color_out.rgb * brightness_multiplier +\n" - " brightness_offset * cogl_color_out.a);\n" - /* Apply the contrast */ - "cogl_color_out.rgb = ((cogl_color_out.rgb - 0.5 * cogl_color_out.a) *\n" - " contrast + 0.5 * cogl_color_out.a);\n"; - -static const ClutterColor no_brightness_change = { 0x7f, 0x7f, 0x7f, 0xff }; -static const ClutterColor no_contrast_change = { 0x7f, 0x7f, 0x7f, 0xff }; -static const gfloat no_change = 0.0f; - -enum -{ - PROP_0, - - PROP_BRIGHTNESS, - PROP_CONTRAST, - - PROP_LAST -}; - -static GParamSpec *obj_props[PROP_LAST]; - -G_DEFINE_TYPE (ClutterBrightnessContrastEffect, - clutter_brightness_contrast_effect, - CLUTTER_TYPE_OFFSCREEN_EFFECT); - -static gboolean -will_have_no_effect (ClutterBrightnessContrastEffect *self) -{ - return (G_APPROX_VALUE (self->brightness_red, no_change, FLT_EPSILON) && - G_APPROX_VALUE (self->brightness_green, no_change, FLT_EPSILON) && - G_APPROX_VALUE (self->brightness_blue, no_change, FLT_EPSILON) && - G_APPROX_VALUE (self->contrast_red, no_change, FLT_EPSILON) && - G_APPROX_VALUE (self->contrast_green, no_change, FLT_EPSILON) && - G_APPROX_VALUE (self->contrast_blue, no_change, FLT_EPSILON)); -} - -static CoglPipeline * -clutter_brightness_contrast_effect_create_pipeline (ClutterOffscreenEffect *effect, - CoglTexture *texture) -{ - ClutterBrightnessContrastEffect *self = - CLUTTER_BRIGHTNESS_CONTRAST_EFFECT (effect); - - cogl_pipeline_set_layer_texture (self->pipeline, 0, texture); - - return cogl_object_ref (self->pipeline); -} - -static gboolean -clutter_brightness_contrast_effect_pre_paint (ClutterEffect *effect, - ClutterPaintNode *node, - ClutterPaintContext *paint_context) -{ - ClutterBrightnessContrastEffect *self = CLUTTER_BRIGHTNESS_CONTRAST_EFFECT (effect); - ClutterEffectClass *parent_class; - - if (will_have_no_effect (self)) - return FALSE; - - if (!clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL)) - { - /* if we don't have support for GLSL shaders then we - * forcibly disable the ActorMeta - */ - g_warning ("Unable to use the ClutterBrightnessContrastEffect: the " - "graphics hardware or the current GL driver does not " - "implement support for the GLSL shading language. The " - "effect will be disabled."); - clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE); - return FALSE; - } - - parent_class = - CLUTTER_EFFECT_CLASS (clutter_brightness_contrast_effect_parent_class); - - return parent_class->pre_paint (effect, node, paint_context); -} - -static void -clutter_brightness_contrast_effect_dispose (GObject *gobject) -{ - ClutterBrightnessContrastEffect *self = CLUTTER_BRIGHTNESS_CONTRAST_EFFECT (gobject); - - if (self->pipeline != NULL) - { - cogl_object_unref (self->pipeline); - self->pipeline = NULL; - } - - G_OBJECT_CLASS (clutter_brightness_contrast_effect_parent_class)->dispose (gobject); -} - -static void -clutter_brightness_contrast_effect_set_property (GObject *gobject, - guint prop_id, - const GValue *value, - GParamSpec *pspec) -{ - ClutterBrightnessContrastEffect *effect = CLUTTER_BRIGHTNESS_CONTRAST_EFFECT (gobject); - - switch (prop_id) - { - case PROP_BRIGHTNESS: - { - const ClutterColor *color = clutter_value_get_color (value); - clutter_brightness_contrast_effect_set_brightness_full (effect, - color->red / 127.0f - 1.0f, - color->green / 127.0f - 1.0f, - color->blue / 127.0f - 1.0f); - } - break; - - case PROP_CONTRAST: - { - const ClutterColor *color = clutter_value_get_color (value); - clutter_brightness_contrast_effect_set_contrast_full (effect, - color->red / 127.0f - 1.0f, - color->green / 127.0f - 1.0f, - color->blue / 127.0f - 1.0f); - } - break; - - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); - break; - } -} - -static void -clutter_brightness_contrast_effect_get_property (GObject *gobject, - guint prop_id, - GValue *value, - GParamSpec *pspec) -{ - ClutterBrightnessContrastEffect *effect = CLUTTER_BRIGHTNESS_CONTRAST_EFFECT (gobject); - ClutterColor color; - - switch (prop_id) - { - case PROP_BRIGHTNESS: - { - color.red = (effect->brightness_red + 1.0f) * 127.0f; - color.green = (effect->brightness_green + 1.0f) * 127.0f; - color.blue = (effect->brightness_blue + 1.0f) * 127.0f; - color.alpha = 0xff; - - clutter_value_set_color (value, &color); - } - break; - - case PROP_CONTRAST: - { - color.red = (effect->contrast_red + 1.0f) * 127.0f; - color.green = (effect->contrast_green + 1.0f) * 127.0f; - color.blue = (effect->contrast_blue + 1.0f) * 127.0f; - color.alpha = 0xff; - - clutter_value_set_color (value, &color); - } - break; - - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); - break; - } -} - -static void -clutter_brightness_contrast_effect_class_init (ClutterBrightnessContrastEffectClass *klass) -{ - ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass); - GObjectClass *gobject_class = G_OBJECT_CLASS (klass); - ClutterOffscreenEffectClass *offscreen_class; - - offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass); - offscreen_class->create_pipeline = clutter_brightness_contrast_effect_create_pipeline; - - effect_class->pre_paint = clutter_brightness_contrast_effect_pre_paint; - - gobject_class->set_property = clutter_brightness_contrast_effect_set_property; - gobject_class->get_property = clutter_brightness_contrast_effect_get_property; - gobject_class->dispose = clutter_brightness_contrast_effect_dispose; - - /** - * ClutterBrightnessContrastEffect:brightness: - * - * The brightness change to apply to the effect. - * - * This property uses a #ClutterColor to represent the changes to each - * color channel. The range is [ 0, 255 ], with 127 as the value used - * to indicate no change; values smaller than 127 indicate a decrease - * in brightness, and values larger than 127 indicate an increase in - * brightness. - * - * Since: 1.10 - */ - obj_props[PROP_BRIGHTNESS] = - clutter_param_spec_color ("brightness", - P_("Brightness"), - P_("The brightness change to apply"), - &no_brightness_change, - CLUTTER_PARAM_READWRITE); - - /** - * ClutterBrightnessContrastEffect:contrast: - * - * The contrast change to apply to the effect. - * - * This property uses a #ClutterColor to represent the changes to each - * color channel. The range is [ 0, 255 ], with 127 as the value used - * to indicate no change; values smaller than 127 indicate a decrease - * in contrast, and values larger than 127 indicate an increase in - * contrast. - * - * Since: 1.10 - */ - obj_props[PROP_CONTRAST] = - clutter_param_spec_color ("contrast", - P_("Contrast"), - P_("The contrast change to apply"), - &no_contrast_change, - CLUTTER_PARAM_READWRITE); - - g_object_class_install_properties (gobject_class, PROP_LAST, obj_props); -} - -static void -get_brightness_values (gfloat value, - gfloat *multiplier, - gfloat *offset) -{ - if (value < 0.0f) - { - *multiplier = 1.0f + value; - *offset = 0.0f; - } - else - { - *multiplier = 1.0f - value; - *offset = value; - } -} - -static inline void -update_uniforms (ClutterBrightnessContrastEffect *self) -{ - if (self->brightness_multiplier_uniform > -1 && - self->brightness_offset_uniform > -1) - { - float brightness_multiplier[3]; - float brightness_offset[3]; - - get_brightness_values (self->brightness_red, - brightness_multiplier + 0, - brightness_offset + 0); - get_brightness_values (self->brightness_green, - brightness_multiplier + 1, - brightness_offset + 1); - get_brightness_values (self->brightness_blue, - brightness_multiplier + 2, - brightness_offset + 2); - - cogl_pipeline_set_uniform_float (self->pipeline, - self->brightness_multiplier_uniform, - 3, /* n_components */ - 1, /* count */ - brightness_multiplier); - cogl_pipeline_set_uniform_float (self->pipeline, - self->brightness_offset_uniform, - 3, /* n_components */ - 1, /* count */ - brightness_offset); - } - - if (self->contrast_uniform > -1) - { - float contrast[3] = { - tan ((self->contrast_red + 1) * G_PI_4), - tan ((self->contrast_green + 1) * G_PI_4), - tan ((self->contrast_blue + 1) * G_PI_4) - }; - - cogl_pipeline_set_uniform_float (self->pipeline, - self->contrast_uniform, - 3, /* n_components */ - 1, /* count */ - contrast); - } -} - -static void -clutter_brightness_contrast_effect_init (ClutterBrightnessContrastEffect *self) -{ - ClutterBrightnessContrastEffectClass *klass; - - self->brightness_red = no_change; - self->brightness_green = no_change; - self->brightness_blue = no_change; - - self->contrast_red = no_change; - self->contrast_green = no_change; - self->contrast_blue = no_change; - - klass = CLUTTER_BRIGHTNESS_CONTRAST_EFFECT_GET_CLASS (self); - - if (G_UNLIKELY (klass->base_pipeline == NULL)) - { - CoglSnippet *snippet; - CoglContext *ctx = - clutter_backend_get_cogl_context (clutter_get_default_backend ()); - - klass->base_pipeline = cogl_pipeline_new (ctx); - - snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT, - brightness_contrast_decls, - brightness_contrast_source); - cogl_pipeline_add_snippet (klass->base_pipeline, snippet); - cogl_object_unref (snippet); - - cogl_pipeline_set_layer_null_texture (klass->base_pipeline, 0); - } - - self->pipeline = cogl_pipeline_copy (klass->base_pipeline); - - self->brightness_multiplier_uniform = - cogl_pipeline_get_uniform_location (self->pipeline, - "brightness_multiplier"); - self->brightness_offset_uniform = - cogl_pipeline_get_uniform_location (self->pipeline, - "brightness_offset"); - self->contrast_uniform = - cogl_pipeline_get_uniform_location (self->pipeline, "contrast"); - - update_uniforms (self); -} - -/** - * clutter_brightness_contrast_effect_new: - * - * Creates a new #ClutterBrightnessContrastEffect to be used with - * clutter_actor_add_effect() - * - * Return value: (transfer full): the newly created - * #ClutterBrightnessContrastEffect or %NULL. Use g_object_unref() when - * done. - * - * Since: 1.10 - */ -ClutterEffect * -clutter_brightness_contrast_effect_new (void) -{ - return g_object_new (CLUTTER_TYPE_BRIGHTNESS_CONTRAST_EFFECT, NULL); -} - -/** - * clutter_brightness_contrast_effect_set_brightness_full: - * @effect: a #ClutterBrightnessContrastEffect - * @red: red component of the change in brightness - * @green: green component of the change in brightness - * @blue: blue component of the change in brightness - * - * The range for each component is [-1.0, 1.0] where 0.0 designates no change, - * values below 0.0 mean a decrease in brightness, and values above indicate - * an increase. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_set_brightness_full (ClutterBrightnessContrastEffect *effect, - gfloat red, - gfloat green, - gfloat blue) -{ - g_return_if_fail (CLUTTER_IS_BRIGHTNESS_CONTRAST_EFFECT (effect)); - - if (G_APPROX_VALUE (red, effect->brightness_red, FLT_EPSILON) && - G_APPROX_VALUE (green, effect->brightness_green, FLT_EPSILON) && - G_APPROX_VALUE (blue, effect->brightness_blue, FLT_EPSILON)) - return; - - effect->brightness_red = red; - effect->brightness_green = green; - effect->brightness_blue = blue; - - update_uniforms (effect); - - clutter_effect_queue_repaint (CLUTTER_EFFECT (effect)); - - g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_BRIGHTNESS]); -} - -/** - * clutter_brightness_contrast_effect_get_brightness: - * @effect: a #ClutterBrightnessContrastEffect - * @red: (out) (allow-none): return location for red component of the - * change in brightness - * @green: (out) (allow-none): return location for green component of the - * change in brightness - * @blue: (out) (allow-none): return location for blue component of the - * change in brightness - * - * Retrieves the change in brightness used by @effect. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_get_brightness (ClutterBrightnessContrastEffect *effect, - gfloat *red, - gfloat *green, - gfloat *blue) -{ - g_return_if_fail (CLUTTER_IS_BRIGHTNESS_CONTRAST_EFFECT (effect)); - - if (red != NULL) - *red = effect->brightness_red; - - if (green != NULL) - *green = effect->brightness_green; - - if (blue != NULL) - *blue = effect->brightness_blue; -} - -/** - * clutter_brightness_contrast_effect_set_brightness: - * @effect: a #ClutterBrightnessContrastEffect - * @brightness: the brightness change for all three components (r, g, b) - * - * The range of @brightness is [-1.0, 1.0], where 0.0 designates no change; - * a value below 0.0 indicates a decrease in brightness; and a value - * above 0.0 indicates an increase of brightness. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_set_brightness (ClutterBrightnessContrastEffect *effect, - gfloat brightness) -{ - clutter_brightness_contrast_effect_set_brightness_full (effect, - brightness, - brightness, - brightness); -} - -/** - * clutter_brightness_contrast_effect_set_contrast_full: - * @effect: a #ClutterBrightnessContrastEffect - * @red: red component of the change in contrast - * @green: green component of the change in contrast - * @blue: blue component of the change in contrast - * - * The range for each component is [-1.0, 1.0] where 0.0 designates no change, - * values below 0.0 mean a decrease in contrast, and values above indicate - * an increase. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_set_contrast_full (ClutterBrightnessContrastEffect *effect, - gfloat red, - gfloat green, - gfloat blue) -{ - g_return_if_fail (CLUTTER_IS_BRIGHTNESS_CONTRAST_EFFECT (effect)); - - if (G_APPROX_VALUE (red, effect->contrast_red, FLT_EPSILON) && - G_APPROX_VALUE (green, effect->contrast_green, FLT_EPSILON) && - G_APPROX_VALUE (blue, effect->contrast_blue, FLT_EPSILON)) - return; - - effect->contrast_red = red; - effect->contrast_green = green; - effect->contrast_blue = blue; - - update_uniforms (effect); - - clutter_effect_queue_repaint (CLUTTER_EFFECT (effect)); - - g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_CONTRAST]); -} - -/** - * clutter_brightness_contrast_effect_get_contrast: - * @effect: a #ClutterBrightnessContrastEffect - * @red: (out) (allow-none): return location for red component of the - * change in contrast - * @green: (out) (allow-none): return location for green component of the - * change in contrast - * @blue: (out) (allow-none): return location for blue component of the - * change in contrast - * - * Retrieves the contrast value used by @effect. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_get_contrast (ClutterBrightnessContrastEffect *effect, - gfloat *red, - gfloat *green, - gfloat *blue) -{ - g_return_if_fail (CLUTTER_IS_BRIGHTNESS_CONTRAST_EFFECT (effect)); - - if (red != NULL) - *red = effect->contrast_red; - - if (green != NULL) - *green = effect->contrast_green; - - if (blue != NULL) - *blue = effect->contrast_blue; -} - -/** - * clutter_brightness_contrast_effect_set_contrast: - * @effect: a #ClutterBrightnessContrastEffect - * @contrast: contrast change for all three channels - * - * The range for @contrast is [-1.0, 1.0], where 0.0 designates no change; - * a value below 0.0 indicates a decrease in contrast; and a value above - * 0.0 indicates an increase. - * - * Since: 1.10 - */ -void -clutter_brightness_contrast_effect_set_contrast (ClutterBrightnessContrastEffect *effect, - gfloat contrast) -{ - clutter_brightness_contrast_effect_set_contrast_full (effect, - contrast, - contrast, - contrast); -} |