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Diffstat (limited to 'app/operations/gimpbrightnesscontrastconfig.c')
| -rw-r--r-- | app/operations/gimpbrightnesscontrastconfig.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/app/operations/gimpbrightnesscontrastconfig.c b/app/operations/gimpbrightnesscontrastconfig.c new file mode 100644 index 0000000..75ee36a --- /dev/null +++ b/app/operations/gimpbrightnesscontrastconfig.c @@ -0,0 +1,248 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpbrightnesscontrastconfig.c + * Copyright (C) 2007 Michael Natterer <mitch@gimp.org> + * + * 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 <gdk-pixbuf/gdk-pixbuf.h> +#include <gegl.h> + +#include "libgimpmath/gimpmath.h" +#include "libgimpconfig/gimpconfig.h" + +#include "operations-types.h" + +#include "gimpbrightnesscontrastconfig.h" +#include "gimplevelsconfig.h" + +#include "gimp-intl.h" + + +enum +{ + PROP_0, + PROP_BRIGHTNESS, + PROP_CONTRAST +}; + + +static void gimp_brightness_contrast_config_iface_init (GimpConfigInterface *iface); + +static void gimp_brightness_contrast_config_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); +static void gimp_brightness_contrast_config_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); + +static gboolean gimp_brightness_contrast_config_equal (GimpConfig *a, + GimpConfig *b); + + +G_DEFINE_TYPE_WITH_CODE (GimpBrightnessContrastConfig, + gimp_brightness_contrast_config, + GIMP_TYPE_OPERATION_SETTINGS, + G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG, + gimp_brightness_contrast_config_iface_init)) + +#define parent_class gimp_brightness_contrast_config_parent_class + + +static void +gimp_brightness_contrast_config_class_init (GimpBrightnessContrastConfigClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass); + + object_class->set_property = gimp_brightness_contrast_config_set_property; + object_class->get_property = gimp_brightness_contrast_config_get_property; + + viewable_class->default_icon_name = "gimp-tool-brightness-contrast"; + + GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_BRIGHTNESS, + "brightness", + _("Brightness"), + _("Brightness"), + -1.0, 1.0, 0.0, 0); + + GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_CONTRAST, + "contrast", + _("Contrast"), + _("Contrast"), + -1.0, 1.0, 0.0, 0); +} + +static void +gimp_brightness_contrast_config_iface_init (GimpConfigInterface *iface) +{ + iface->equal = gimp_brightness_contrast_config_equal; +} + +static void +gimp_brightness_contrast_config_init (GimpBrightnessContrastConfig *self) +{ +} + +static void +gimp_brightness_contrast_config_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GimpBrightnessContrastConfig *self = GIMP_BRIGHTNESS_CONTRAST_CONFIG (object); + + switch (property_id) + { + case PROP_BRIGHTNESS: + g_value_set_double (value, self->brightness); + break; + + case PROP_CONTRAST: + g_value_set_double (value, self->contrast); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_brightness_contrast_config_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpBrightnessContrastConfig *self = GIMP_BRIGHTNESS_CONTRAST_CONFIG (object); + + switch (property_id) + { + case PROP_BRIGHTNESS: + self->brightness = g_value_get_double (value); + break; + + case PROP_CONTRAST: + self->contrast = g_value_get_double (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static gboolean +gimp_brightness_contrast_config_equal (GimpConfig *a, + GimpConfig *b) +{ + GimpBrightnessContrastConfig *config_a = GIMP_BRIGHTNESS_CONTRAST_CONFIG (a); + GimpBrightnessContrastConfig *config_b = GIMP_BRIGHTNESS_CONTRAST_CONFIG (b); + + if (! gimp_operation_settings_config_equal_base (a, b) || + config_a->brightness != config_b->brightness || + config_a->contrast != config_b->contrast) + { + return FALSE; + } + + return TRUE; +} + + +/* public functions */ + +GimpLevelsConfig * +gimp_brightness_contrast_config_to_levels_config (GimpBrightnessContrastConfig *config) +{ + GimpLevelsConfig *levels; + gdouble brightness; + gdouble slant; + gdouble value; + + g_return_val_if_fail (GIMP_IS_BRIGHTNESS_CONTRAST_CONFIG (config), NULL); + + levels = g_object_new (GIMP_TYPE_LEVELS_CONFIG, NULL); + + gimp_operation_settings_config_copy_base (GIMP_CONFIG (config), + GIMP_CONFIG (levels), + 0); + + brightness = config->brightness / 2.0; + slant = tan ((config->contrast + 1) * G_PI_4); + + if (config->brightness >= 0) + { + value = -0.5 * slant + brightness * slant + 0.5; + + if (value < 0.0) + { + value = 0.0; + + /* this slightly convoluted math follows by inverting the + * calculation of the brightness/contrast LUT in base/lut-funcs.h */ + + levels->low_input[GIMP_HISTOGRAM_VALUE] = + (- brightness * slant + 0.5 * slant - 0.5) / (slant - brightness * slant); + } + + levels->low_output[GIMP_HISTOGRAM_VALUE] = value; + + value = 0.5 * slant + 0.5; + + if (value > 1.0) + { + value = 1.0; + + levels->high_input[GIMP_HISTOGRAM_VALUE] = + (- brightness * slant + 0.5 * slant + 0.5) / (slant - brightness * slant); + } + + levels->high_output[GIMP_HISTOGRAM_VALUE] = value; + } + else + { + value = 0.5 - 0.5 * slant; + + if (value < 0.0) + { + value = 0.0; + + levels->low_input[GIMP_HISTOGRAM_VALUE] = + (0.5 * slant - 0.5) / (slant + brightness * slant); + } + + levels->low_output[GIMP_HISTOGRAM_VALUE] = value; + + value = slant * brightness + slant * 0.5 + 0.5; + + if (value > 1.0) + { + value = 1.0; + + levels->high_input[GIMP_HISTOGRAM_VALUE] = + (0.5 * slant + 0.5) / (slant + brightness * slant); + } + + levels->high_output[GIMP_HISTOGRAM_VALUE] = value; + } + + return levels; +} |