6a1d49bc6d
The porting from 8bit per component scaled some 8bit fractions up to huge floating point numbers, this works for most values but causes trouble for near transparent pixel values. This commit copies the inner blend loop from the new divide layer mode, but keeps the old compositing logic.
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationdividemode.c
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* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
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* 2012 Ville Sokk <ville.sokk@gmail.com>
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl-plugin.h>
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#include "../operations-types.h"
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#include "gimpoperationdividelegacy.h"
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G_DEFINE_TYPE (GimpOperationDivideLegacy, gimp_operation_divide_legacy,
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GIMP_TYPE_OPERATION_LAYER_MODE)
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static void
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gimp_operation_divide_legacy_class_init (GimpOperationDivideLegacyClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointComposer3Class *point_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:divide-legacy",
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"description", "GIMP divide mode operation",
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NULL);
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point_class->process = gimp_operation_divide_legacy_process;
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}
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static void
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gimp_operation_divide_legacy_init (GimpOperationDivideLegacy *self)
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{
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}
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gboolean
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gimp_operation_divide_legacy_process (GeglOperation *op,
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void *in_p,
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void *layer_p,
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void *mask_p,
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void *out_p,
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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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GimpOperationLayerMode *layer_mode = (gpointer) op;
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gfloat *in = in_p;
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gfloat *out = out_p;
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gfloat *layer = layer_p;
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gfloat *mask = mask_p;
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gfloat opacity = layer_mode->opacity;
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while (samples--)
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{
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gfloat comp_alpha, new_alpha;
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comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
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if (mask)
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comp_alpha *= *mask;
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new_alpha = in[ALPHA] + (1.0 - in[ALPHA]) * comp_alpha;
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if (comp_alpha && new_alpha)
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{
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gint b;
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gfloat ratio = comp_alpha / new_alpha;
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for (b = RED; b < ALPHA; b++)
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{
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gfloat comp = in[b] / layer[b];
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/* make infinities(or NaN) correspond to a high number,
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* to get more predictable math, ideally higher than 5.0
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* but it seems like some babl conversions might be
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* acting up then
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*/
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if (!(comp > -42949672.0f && comp < 5.0f))
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comp = 1.0f;
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out[b] = comp * ratio + in[b] * (1.0 - ratio);
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out[b] = CLAMP (out[b], 0.0, 1.0);
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}
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}
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else
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{
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gint b;
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for (b = RED; b < ALPHA; b++)
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{
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out[b] = in[b];
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}
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}
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out[ALPHA] = in[ALPHA];
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in += 4;
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layer += 4;
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out += 4;
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if (mask)
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mask++;
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}
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return TRUE;
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}
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