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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:23:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:23:22 +0000 |
commit | e42129241681dde7adae7d20697e7b421682fbb4 (patch) | |
tree | af1fe815a5e639e68e59fabd8395ec69458b3e5e /app/operations/layer-modes/gimpoperationlayermode-composite.c | |
parent | Initial commit. (diff) | |
download | gimp-e42129241681dde7adae7d20697e7b421682fbb4.tar.xz gimp-e42129241681dde7adae7d20697e7b421682fbb4.zip |
Adding upstream version 2.10.22.upstream/2.10.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | app/operations/layer-modes/gimpoperationlayermode-composite.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/app/operations/layer-modes/gimpoperationlayermode-composite.c b/app/operations/layer-modes/gimpoperationlayermode-composite.c new file mode 100644 index 0000000..4275818 --- /dev/null +++ b/app/operations/layer-modes/gimpoperationlayermode-composite.c @@ -0,0 +1,434 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpoperationlayermode-composite.c + * Copyright (C) 2017 Michael Natterer <mitch@gimp.org> + * 2017 Øyvind Kolås <pippin@gimp.org> + * 2017 Ell + * + * 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 <gegl-plugin.h> +#include <cairo.h> +#include <gdk-pixbuf/gdk-pixbuf.h> + +#include "../operations-types.h" + +#include "gimpoperationlayermode-composite.h" + + +/* non-subtractive compositing functions. these functions expect comp[ALPHA] + * to be the same as layer[ALPHA]. when in[ALPHA] or layer[ALPHA] are zero, + * the value of comp[RED..BLUE] is unconstrained (in particular, it may be + * NaN). + */ + + +void +gimp_operation_layer_mode_composite_union (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat new_alpha; + gfloat in_alpha = in[ALPHA]; + gfloat layer_alpha = layer[ALPHA] * opacity; + + if (mask) + layer_alpha *= *mask; + + new_alpha = layer_alpha + (1.0f - layer_alpha) * in_alpha; + + if (layer_alpha == 0.0f || new_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else if (in_alpha == 0.0f) + { + out[RED] = layer[RED]; + out[GREEN] = layer[GREEN]; + out[BLUE] = layer[BLUE]; + } + else + { + gfloat ratio = layer_alpha / new_alpha; + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = ratio * (in_alpha * (comp[b] - layer[b]) + layer[b] - in[b]) + in[b]; + } + + out[ALPHA] = new_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_clip_to_backdrop (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat layer_alpha = comp[ALPHA] * opacity; + + if (mask) + layer_alpha *= *mask; + + if (in[ALPHA] == 0.0f || layer_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else + { + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = comp[b] * layer_alpha + in[b] * (1.0f - layer_alpha); + } + + out[ALPHA] = in[ALPHA]; + + in += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_clip_to_layer (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat layer_alpha = layer[ALPHA] * opacity; + + if (mask) + layer_alpha *= *mask; + + if (layer_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else if (in[ALPHA] == 0.0f) + { + out[RED] = layer[RED]; + out[GREEN] = layer[GREEN]; + out[BLUE] = layer[BLUE]; + } + else + { + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = comp[b] * in[ALPHA] + layer[b] * (1.0f - in[ALPHA]); + } + + out[ALPHA] = layer_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_intersection (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat new_alpha = in[ALPHA] * comp[ALPHA] * opacity; + + if (mask) + new_alpha *= *mask; + + if (new_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else + { + out[RED] = comp[RED]; + out[GREEN] = comp[GREEN]; + out[BLUE] = comp[BLUE]; + } + + out[ALPHA] = new_alpha; + + in += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +/* subtractive compositing functions. these functions expect comp[ALPHA] to + * specify the modified alpha of the overlapping content, as a fraction of the + * original overlapping content (i.e., an alpha of 1.0 specifies that no + * content is subtracted.) when in[ALPHA] or layer[ALPHA] are zero, the value + * of comp[RED..BLUE] is unconstrained (in particular, it may be NaN). + */ + +void +gimp_operation_layer_mode_composite_union_sub (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat in_alpha = in[ALPHA]; + gfloat layer_alpha = layer[ALPHA] * opacity; + gfloat comp_alpha = comp[ALPHA]; + gfloat new_alpha; + + if (mask) + layer_alpha *= *mask; + + new_alpha = in_alpha + layer_alpha - + (2.0f - comp_alpha) * in_alpha * layer_alpha; + + if (layer_alpha == 0.0f || new_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else if (in_alpha == 0.0f) + { + out[RED] = layer[RED]; + out[GREEN] = layer[GREEN]; + out[BLUE] = layer[BLUE]; + } + else + { + gfloat ratio = in_alpha / new_alpha; + gfloat layer_coeff = 1.0f / in_alpha - 1.0f; + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = ratio * (layer_alpha * (comp_alpha * comp[b] + layer_coeff * layer[b] - in[b]) + in[b]); + } + + out[ALPHA] = new_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_clip_to_backdrop_sub (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat layer_alpha = layer[ALPHA] * opacity; + gfloat comp_alpha = comp[ALPHA]; + gfloat new_alpha; + + if (mask) + layer_alpha *= *mask; + + comp_alpha *= layer_alpha; + + new_alpha = 1.0f - layer_alpha + comp_alpha; + + if (in[ALPHA] == 0.0f || comp_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else + { + gfloat ratio = comp_alpha / new_alpha; + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = comp[b] * ratio + in[b] * (1.0f - ratio); + } + + new_alpha *= in[ALPHA]; + + out[ALPHA] = new_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_clip_to_layer_sub (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat in_alpha = in[ALPHA]; + gfloat layer_alpha = layer[ALPHA] * opacity; + gfloat comp_alpha = comp[ALPHA]; + gfloat new_alpha; + + if (mask) + layer_alpha *= *mask; + + comp_alpha *= in_alpha; + + new_alpha = 1.0f - in_alpha + comp_alpha; + + if (layer_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else if (in_alpha == 0.0f) + { + out[RED] = layer[RED]; + out[GREEN] = layer[GREEN]; + out[BLUE] = layer[BLUE]; + } + else + { + gfloat ratio = comp_alpha / new_alpha; + gint b; + + for (b = RED; b < ALPHA; b++) + out[b] = comp[b] * ratio + layer[b] * (1.0f - ratio); + } + + new_alpha *= layer_alpha; + + out[ALPHA] = new_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} + +void +gimp_operation_layer_mode_composite_intersection_sub (const gfloat *in, + const gfloat *layer, + const gfloat *comp, + const gfloat *mask, + gfloat opacity, + gfloat *out, + gint samples) +{ + while (samples--) + { + gfloat new_alpha = in[ALPHA] * layer[ALPHA] * comp[ALPHA] * opacity; + + if (mask) + new_alpha *= *mask; + + if (new_alpha == 0.0f) + { + out[RED] = in[RED]; + out[GREEN] = in[GREEN]; + out[BLUE] = in[BLUE]; + } + else + { + out[RED] = comp[RED]; + out[GREEN] = comp[GREEN]; + out[BLUE] = comp[BLUE]; + } + + out[ALPHA] = new_alpha; + + in += 4; + layer += 4; + comp += 4; + out += 4; + + if (mask) + mask++; + } +} |