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diff --git a/app/operations/layer-modes/gimpoperationlayermode-blend.h b/app/operations/layer-modes/gimpoperationlayermode-blend.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-blend.h
+ * 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; withcomp 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/>.
+ */
+
+#ifndef __GIMP_OPERATION_LAYER_MODE_BLEND_H__
+#define __GIMP_OPERATION_LAYER_MODE_BLEND_H__
+
+
+/* nonsubtractive blend functions */
+
+void gimp_operation_layer_mode_blend_addition (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_burn (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_darken_only (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_difference (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_divide (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_dodge (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_exclusion (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_grain_extract (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_grain_merge (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hard_mix (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hardlight (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hsl_color (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hsv_hue (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hsv_saturation (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_hsv_value (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_lch_chroma (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_lch_color (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_lch_hue (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_lch_lightness (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_lighten_only (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_linear_burn (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_linear_light (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_luma_darken_only (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_luma_lighten_only (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_luminance (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_multiply (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_overlay (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_pin_light (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_screen (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_softlight (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_subtract (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+void gimp_operation_layer_mode_blend_vivid_light (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+
+
+/* subtractive blend functions */
+
+void gimp_operation_layer_mode_blend_color_erase (GeglOperation *operation,
+ const gfloat *in,
+ const gfloat *layer,
+ gfloat *comp,
+ gint samples);
+
+
+#endif /* __GIMP_OPERATION_LAYER_MODE_BLEND_H__ */