247 lines
7.4 KiB
C
247 lines
7.4 KiB
C
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/* 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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* 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 <string.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libpikamath/pikamath.h"
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#include "core-types.h"
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#include "pikacurve.h"
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#include "pikacurve-map.h"
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enum
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{
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CURVE_NONE = 0,
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CURVE_COLORS = 1 << 0,
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CURVE_RED = 1 << 1,
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CURVE_GREEN = 1 << 2,
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CURVE_BLUE = 1 << 3,
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CURVE_ALPHA = 1 << 4
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};
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static guint pika_curve_get_apply_mask (PikaCurve *curve_colors,
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PikaCurve *curve_red,
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PikaCurve *curve_green,
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PikaCurve *curve_blue,
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PikaCurve *curve_alpha);
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static inline gdouble pika_curve_map_value_inline (PikaCurve *curve,
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gdouble value);
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gdouble
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pika_curve_map_value (PikaCurve *curve,
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gdouble value)
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{
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g_return_val_if_fail (PIKA_IS_CURVE (curve), 0.0);
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return pika_curve_map_value_inline (curve, value);
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}
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void
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pika_curve_map_pixels (PikaCurve *curve_colors,
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PikaCurve *curve_red,
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PikaCurve *curve_green,
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PikaCurve *curve_blue,
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PikaCurve *curve_alpha,
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gfloat *src,
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gfloat *dest,
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glong samples)
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{
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g_return_if_fail (PIKA_IS_CURVE (curve_colors));
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g_return_if_fail (PIKA_IS_CURVE (curve_red));
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g_return_if_fail (PIKA_IS_CURVE (curve_green));
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g_return_if_fail (PIKA_IS_CURVE (curve_blue));
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g_return_if_fail (PIKA_IS_CURVE (curve_alpha));
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switch (pika_curve_get_apply_mask (curve_colors,
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curve_red,
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curve_green,
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curve_blue,
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curve_alpha))
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{
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case CURVE_NONE:
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memcpy (dest, src, samples * 4 * sizeof (gfloat));
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break;
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case CURVE_COLORS:
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while (samples--)
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{
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dest[0] = pika_curve_map_value_inline (curve_colors, src[0]);
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dest[1] = pika_curve_map_value_inline (curve_colors, src[1]);
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dest[2] = pika_curve_map_value_inline (curve_colors, src[2]);
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/* don't apply the colors curve to the alpha channel */
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case CURVE_RED:
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while (samples--)
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{
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dest[0] = pika_curve_map_value_inline (curve_red, src[0]);
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dest[1] = src[1];
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dest[2] = src[2];
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case CURVE_GREEN:
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while (samples--)
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{
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dest[0] = src[0];
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dest[1] = pika_curve_map_value_inline (curve_green, src[1]);
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dest[2] = src[2];
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case CURVE_BLUE:
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while (samples--)
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{
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dest[0] = src[0];
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dest[1] = src[1];
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dest[2] = pika_curve_map_value_inline (curve_blue, src[2]);
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case CURVE_ALPHA:
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while (samples--)
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{
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dest[0] = src[0];
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dest[1] = src[1];
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dest[2] = src[2];
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dest[3] = pika_curve_map_value_inline (curve_alpha, src[3]);
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src += 4;
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dest += 4;
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}
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break;
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case (CURVE_RED | CURVE_GREEN | CURVE_BLUE):
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while (samples--)
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{
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dest[0] = pika_curve_map_value_inline (curve_red, src[0]);
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dest[1] = pika_curve_map_value_inline (curve_green, src[1]);
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dest[2] = pika_curve_map_value_inline (curve_blue, src[2]);
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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default:
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while (samples--)
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{
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dest[0] = pika_curve_map_value_inline (curve_colors,
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pika_curve_map_value_inline (curve_red,
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src[0]));
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dest[1] = pika_curve_map_value_inline (curve_colors,
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pika_curve_map_value_inline (curve_green,
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src[1]));
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dest[2] = pika_curve_map_value_inline (curve_colors,
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pika_curve_map_value_inline (curve_blue,
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src[2]));
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/* don't apply the colors curve to the alpha channel */
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dest[3] = pika_curve_map_value_inline (curve_alpha, src[3]);
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src += 4;
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dest += 4;
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}
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break;
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}
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}
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static guint
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pika_curve_get_apply_mask (PikaCurve *curve_colors,
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PikaCurve *curve_red,
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PikaCurve *curve_green,
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PikaCurve *curve_blue,
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PikaCurve *curve_alpha)
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{
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return ((pika_curve_is_identity (curve_colors) ? 0 : CURVE_COLORS) |
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(pika_curve_is_identity (curve_red) ? 0 : CURVE_RED) |
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(pika_curve_is_identity (curve_green) ? 0 : CURVE_GREEN) |
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(pika_curve_is_identity (curve_blue) ? 0 : CURVE_BLUE) |
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(pika_curve_is_identity (curve_alpha) ? 0 : CURVE_ALPHA));
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}
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static inline gdouble
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pika_curve_map_value_inline (PikaCurve *curve,
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gdouble value)
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{
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if (curve->identity)
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{
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if (isfinite (value))
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return CLAMP (value, 0.0, 1.0);
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return 0.0;
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}
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/* check for known values first, so broken values like NaN
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* delivered by broken drivers don't run into the interpolation
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* code
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*/
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if (value > 0.0 && value < 1.0) /* interpolate the curve */
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{
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gdouble f;
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gint index;
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/* map value to the sample space */
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value = value * (curve->n_samples - 1);
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/* determine the indices of the closest sample points */
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index = (gint) value;
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/* calculate the position between the sample points */
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f = value - index;
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return (1.0 - f) * curve->samples[index] + f * curve->samples[index + 1];
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}
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else if (value >= 1.0)
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{
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return curve->samples[curve->n_samples - 1];
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}
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else
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{
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return curve->samples[0];
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}
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}
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