145 lines
5.7 KiB
C
145 lines
5.7 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaoperationbrightnesscontrast.c
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* Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "operations-types.h"
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#include "pikabrightnesscontrastconfig.h"
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#include "pikaoperationbrightnesscontrast.h"
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#include "pika-intl.h"
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static gboolean pika_operation_brightness_contrast_process (GeglOperation *operation,
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void *in_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *roi,
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gint level);
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G_DEFINE_TYPE (PikaOperationBrightnessContrast, pika_operation_brightness_contrast,
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PIKA_TYPE_OPERATION_POINT_FILTER)
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#define parent_class pika_operation_brightness_contrast_parent_class
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static void
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pika_operation_brightness_contrast_class_init (PikaOperationBrightnessContrastClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
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object_class->set_property = pika_operation_point_filter_set_property;
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object_class->get_property = pika_operation_point_filter_get_property;
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gegl_operation_class_set_keys (operation_class,
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"name", "pika:brightness-contrast",
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"categories", "color",
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"description", _("Adjust brightness and contrast"),
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NULL);
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point_class->process = pika_operation_brightness_contrast_process;
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g_object_class_install_property (object_class,
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PIKA_OPERATION_POINT_FILTER_PROP_CONFIG,
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g_param_spec_object ("config",
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"Config",
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"The config object",
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PIKA_TYPE_BRIGHTNESS_CONTRAST_CONFIG,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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}
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static void
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pika_operation_brightness_contrast_init (PikaOperationBrightnessContrast *self)
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{
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}
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static inline gfloat
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pika_operation_brightness_contrast_map (gfloat value,
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gdouble brightness,
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gdouble slant)
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{
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/* apply brightness */
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if (brightness < 0.0)
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value = value * (1.0 + brightness);
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else
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value = value + ((1.0 - value) * brightness);
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value = (value - 0.5) * slant + 0.5;
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return value;
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}
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static gboolean
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pika_operation_brightness_contrast_process (GeglOperation *operation,
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void *in_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *roi,
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gint level)
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{
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PikaOperationPointFilter *point = PIKA_OPERATION_POINT_FILTER (operation);
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PikaBrightnessContrastConfig *config = PIKA_BRIGHTNESS_CONTRAST_CONFIG (point->config);
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gfloat *src = in_buf;
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gfloat *dest = out_buf;
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gdouble brightness;
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gdouble slant;
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if (! config)
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return FALSE;
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brightness = config->brightness / 2.0;
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slant = tan ((config->contrast + 1) * G_PI_4);
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while (samples--)
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{
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dest[RED] = pika_operation_brightness_contrast_map (src[RED],
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brightness,
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slant);
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dest[GREEN] = pika_operation_brightness_contrast_map (src[GREEN],
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brightness,
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slant);
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dest[BLUE] = pika_operation_brightness_contrast_map (src[BLUE],
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brightness,
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slant);
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dest[ALPHA] = src[ALPHA];
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src += 4;
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dest += 4;
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}
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return TRUE;
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}
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