Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1522 insertions, 0 deletions

diff --git a/app/operations/layer-modes/gimp-layer-modes.c b/app/operations/layer-modes/gimp-layer-modes.c
new file mode 100644
index 0000000..deb1f3d
--- /dev/null
+++ b/app/operations/layer-modes/gimp-layer-modes.c
@@ -0,0 +1,1522 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-layer-modes.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *                    Øyvind Kolås <pippin@gimp.org>
+ *
+ * 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 <glib-object.h>
+#include <gegl.h>
+
+#include "../operations-types.h"
+
+#include "gegl/gimp-babl.h"
+
+#include "gimpoperationlayermode.h"
+#include "gimpoperationlayermode-blend.h"
+
+#include "gimp-layer-modes.h"
+
+
+typedef struct _GimpLayerModeInfo GimpLayerModeInfo;
+
+struct _GimpLayerModeInfo
+{
+  GimpLayerMode             layer_mode;
+  const gchar              *op_name;
+  GimpLayerModeBlendFunc    blend_function;
+  GimpLayerModeFlags        flags;
+  GimpLayerModeContext      context;
+  GimpLayerCompositeMode    paint_composite_mode;
+  GimpLayerCompositeMode    composite_mode;
+  GimpLayerColorSpace       composite_space;
+  GimpLayerColorSpace       blend_space;
+};
+
+
+/*  static variables  */
+
+static const GimpLayerModeInfo layer_mode_infos[] =
+{
+  { GIMP_LAYER_MODE_NORMAL_LEGACY,
+
+    .op_name              = "gimp:normal",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE  |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DISSOLVE,
+
+    .op_name              = "gimp:dissolve",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION
+  },
+
+  { GIMP_LAYER_MODE_BEHIND_LEGACY,
+
+    .op_name              = "gimp:behind",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_MULTIPLY_LEGACY,
+
+    .op_name              = "gimp:multiply-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SCREEN_LEGACY,
+
+    .op_name              = "gimp:screen-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_OVERLAY_LEGACY,
+
+    .op_name              = "gimp:softlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIFFERENCE_LEGACY,
+
+    .op_name              = "gimp:difference-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_ADDITION_LEGACY,
+
+    .op_name              = "gimp:addition-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SUBTRACT_LEGACY,
+
+    .op_name              = "gimp:subtract-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,
+
+    .op_name              = "gimp:darken-only-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY,
+
+    .op_name              = "gimp:lighten-only-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_HUE_LEGACY,
+
+    .op_name              = "gimp:hsv-hue-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_SATURATION_LEGACY,
+
+    .op_name              = "gimp:hsv-saturation-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSL_COLOR_LEGACY,
+
+    .op_name              = "gimp:hsl-color-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_VALUE_LEGACY,
+
+    .op_name              = "gimp:hsv-value-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIVIDE_LEGACY,
+
+    .op_name              = "gimp:divide-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DODGE_LEGACY,
+
+    .op_name              = "gimp:dodge-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_BURN_LEGACY,
+
+    .op_name              = "gimp:burn-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARDLIGHT_LEGACY,
+
+    .op_name              = "gimp:hardlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,
+
+    .op_name              = "gimp:softlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,
+
+    .op_name              = "gimp:grain-extract-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY,
+
+    .op_name              = "gimp:grain-merge-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_color_erase,
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE  |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_OVERLAY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_overlay,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LCH_HUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_hue,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_CHROMA,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_chroma,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_COLOR,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_color,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_LIGHTNESS,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_lightness,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_NORMAL,
+
+    .op_name              = "gimp:normal",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_BEHIND,
+
+    .op_name              = "gimp:behind",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_MULTIPLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_multiply,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SCREEN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_screen,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIFFERENCE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_difference,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_ADDITION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_addition,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SUBTRACT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_subtract,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_DARKEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_darken_only,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+    /* no blend_space: reuse composite space, no conversion thus fewer copies */
+  },
+
+  { GIMP_LAYER_MODE_LIGHTEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lighten_only,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+    /* no blend_space: reuse composite space, no conversion thus fewer copies */
+  },
+
+  { GIMP_LAYER_MODE_HSV_HUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_hue,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_SATURATION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_saturation,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSL_COLOR,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsl_color,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_VALUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_value,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIVIDE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_divide,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_DODGE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_dodge,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_BURN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_burn,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARDLIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hardlight,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SOFTLIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_softlight,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_EXTRACT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_grain_extract,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_MERGE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_grain_merge,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_VIVID_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_vivid_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_PIN_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_pin_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LINEAR_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_linear_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARD_MIX,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hard_mix,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_EXCLUSION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_exclusion,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LINEAR_BURN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_linear_burn,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luma_darken_only,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luma_lighten_only,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMINANCE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luminance,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_COLOR_ERASE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_color_erase,
+    .flags                = GIMP_LAYER_MODE_FLAG_SUBTRACTIVE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_ERASE,
+
+    .op_name              = "gimp:erase",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE           |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY            |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_MERGE,
+
+    .op_name              = "gimp:merge",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SPLIT,
+
+    .op_name              = "gimp:split",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE               |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY                |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP
+  },
+
+  { GIMP_LAYER_MODE_PASS_THROUGH,
+
+    .op_name              = "gimp:pass-through",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE    |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_GROUP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_REPLACE,
+
+    .op_name              = "gimp:replace",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_ANTI_ERASE,
+
+    .op_name              = "gimp:anti-erase",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION
+  }
+};
+
+static const GimpLayerMode layer_mode_group_default[] =
+{
+  GIMP_LAYER_MODE_PASS_THROUGH,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_REPLACE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_NORMAL,
+  GIMP_LAYER_MODE_DISSOLVE,
+  GIMP_LAYER_MODE_BEHIND,
+  GIMP_LAYER_MODE_COLOR_ERASE,
+  GIMP_LAYER_MODE_ERASE,
+  GIMP_LAYER_MODE_ANTI_ERASE,
+  GIMP_LAYER_MODE_MERGE,
+  GIMP_LAYER_MODE_SPLIT,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LIGHTEN_ONLY,
+  GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+  GIMP_LAYER_MODE_SCREEN,
+  GIMP_LAYER_MODE_DODGE,
+  GIMP_LAYER_MODE_ADDITION,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DARKEN_ONLY,
+  GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+  GIMP_LAYER_MODE_MULTIPLY,
+  GIMP_LAYER_MODE_BURN,
+  GIMP_LAYER_MODE_LINEAR_BURN,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_OVERLAY,
+  GIMP_LAYER_MODE_SOFTLIGHT,
+  GIMP_LAYER_MODE_HARDLIGHT,
+  GIMP_LAYER_MODE_VIVID_LIGHT,
+  GIMP_LAYER_MODE_PIN_LIGHT,
+  GIMP_LAYER_MODE_LINEAR_LIGHT,
+  GIMP_LAYER_MODE_HARD_MIX,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DIFFERENCE,
+  GIMP_LAYER_MODE_EXCLUSION,
+  GIMP_LAYER_MODE_SUBTRACT,
+  GIMP_LAYER_MODE_GRAIN_EXTRACT,
+  GIMP_LAYER_MODE_GRAIN_MERGE,
+  GIMP_LAYER_MODE_DIVIDE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_HSV_HUE,
+  GIMP_LAYER_MODE_HSV_SATURATION,
+  GIMP_LAYER_MODE_HSL_COLOR,
+  GIMP_LAYER_MODE_HSV_VALUE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LCH_HUE,
+  GIMP_LAYER_MODE_LCH_CHROMA,
+  GIMP_LAYER_MODE_LCH_COLOR,
+  GIMP_LAYER_MODE_LCH_LIGHTNESS,
+  GIMP_LAYER_MODE_LUMINANCE
+};
+
+static const GimpLayerMode layer_mode_group_legacy[] =
+{
+  GIMP_LAYER_MODE_NORMAL_LEGACY,
+  GIMP_LAYER_MODE_DISSOLVE,
+  GIMP_LAYER_MODE_BEHIND_LEGACY,
+  GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY,
+  GIMP_LAYER_MODE_SCREEN_LEGACY,
+  GIMP_LAYER_MODE_DODGE_LEGACY,
+  GIMP_LAYER_MODE_ADDITION_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,
+  GIMP_LAYER_MODE_MULTIPLY_LEGACY,
+  GIMP_LAYER_MODE_BURN_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_OVERLAY,
+  GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,
+  GIMP_LAYER_MODE_HARDLIGHT_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DIFFERENCE_LEGACY,
+  GIMP_LAYER_MODE_SUBTRACT_LEGACY,
+  GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,
+  GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY,
+  GIMP_LAYER_MODE_DIVIDE_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_HSV_HUE_LEGACY,
+  GIMP_LAYER_MODE_HSV_SATURATION_LEGACY,
+  GIMP_LAYER_MODE_HSL_COLOR_LEGACY,
+  GIMP_LAYER_MODE_HSV_VALUE_LEGACY
+};
+
+static const GimpLayerMode layer_mode_groups[][2] =
+{
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_NORMAL,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_NORMAL_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DISSOLVE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DISSOLVE
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_BEHIND,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_BEHIND_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_MULTIPLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_MULTIPLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SCREEN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SCREEN_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_OVERLAY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DIFFERENCE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DIFFERENCE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ADDITION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_ADDITION_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SUBTRACT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SUBTRACT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DARKEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LIGHTEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_HUE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_HUE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_SATURATION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_SATURATION_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSL_COLOR,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSL_COLOR_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_VALUE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_VALUE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DIVIDE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DIVIDE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DODGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DODGE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_BURN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_BURN_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HARDLIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HARDLIGHT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SOFTLIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SOFTLIGHT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_GRAIN_EXTRACT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_GRAIN_MERGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_COLOR_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_VIVID_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_PIN_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LINEAR_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HARD_MIX,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_EXCLUSION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LINEAR_BURN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMINANCE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_MERGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SPLIT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_PASS_THROUGH,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1,
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_REPLACE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ANTI_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  }
+};
+
+
+/*  public functions  */
+
+void
+gimp_layer_modes_init (void)
+{
+  gint i;
+
+  for (i = 0; i < G_N_ELEMENTS (layer_mode_infos); i++)
+    {
+      gimp_assert ((GimpLayerMode) i == layer_mode_infos[i].layer_mode);
+    }
+}
+
+static const GimpLayerModeInfo *
+gimp_layer_mode_info (GimpLayerMode mode)
+{
+  g_return_val_if_fail (mode >= 0 && mode < G_N_ELEMENTS (layer_mode_infos),
+                        &layer_mode_infos[0]);
+
+  return &layer_mode_infos[mode];
+}
+
+gboolean
+gimp_layer_mode_is_legacy (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_LEGACY) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_blend_space_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_composite_space_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_composite_mode_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_subtractive (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_SUBTRACTIVE) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_alpha_only (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_ALPHA_ONLY) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_trivial (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_TRIVIAL) != 0;
+}
+
+GimpLayerColorSpace
+gimp_layer_mode_get_blend_space (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COLOR_SPACE_RGB_LINEAR;
+
+  return info->blend_space;
+}
+
+GimpLayerColorSpace
+gimp_layer_mode_get_composite_space (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COLOR_SPACE_RGB_LINEAR;
+
+  return info->composite_space;
+}
+
+GimpLayerCompositeMode
+gimp_layer_mode_get_composite_mode (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COMPOSITE_UNION;
+
+  return info->composite_mode;
+}
+
+GimpLayerCompositeMode
+gimp_layer_mode_get_paint_composite_mode (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COMPOSITE_UNION;
+
+  return info->paint_composite_mode;
+}
+
+const gchar *
+gimp_layer_mode_get_operation (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return "gimp:layer-mode";
+
+  return info->op_name;
+}
+
+GimpLayerModeFunc
+gimp_layer_mode_get_function (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo  *info = gimp_layer_mode_info (mode);
+  static GimpLayerModeFunc  funcs[G_N_ELEMENTS (layer_mode_infos)];
+
+  if (! info)
+    info = layer_mode_infos;
+
+  mode = info - layer_mode_infos;
+
+  if (! funcs[mode])
+    {
+      GeglNode      *node;
+      GeglOperation *operation;
+
+      node = gegl_node_new_child (NULL,
+                                  "operation", info->op_name,
+                                  NULL);
+
+      operation = gegl_node_get_gegl_operation (node);
+
+      funcs[mode] = GIMP_OPERATION_LAYER_MODE_GET_CLASS (operation)->process;
+
+      g_object_unref (node);
+    }
+
+  return funcs[mode];
+}
+
+GimpLayerModeBlendFunc
+gimp_layer_mode_get_blend_function (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return NULL;
+
+  return info->blend_function;
+}
+
+GimpLayerModeContext
+gimp_layer_mode_get_context (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return 0;
+
+  return info->context;
+}
+
+GimpLayerMode *
+gimp_layer_mode_get_context_array (GimpLayerMode         mode,
+                                   GimpLayerModeContext  context,
+                                   gint                 *n_modes)
+{
+  GimpLayerModeGroup   group;
+  const GimpLayerMode *group_modes;
+  gint                 n_group_modes;
+  GimpLayerMode       *array;
+  gint                 i;
+
+  group = gimp_layer_mode_get_group (mode);
+
+  group_modes = gimp_layer_mode_get_group_array (group, &n_group_modes);
+
+  array = g_new0 (GimpLayerMode, n_group_modes);
+  *n_modes = 0;
+
+  for (i = 0; i < n_group_modes; i++)
+    {
+      if (group_modes[i] != GIMP_LAYER_MODE_SEPARATOR &&
+          (gimp_layer_mode_get_context (group_modes[i]) & context))
+        {
+          array[*n_modes] = group_modes[i];
+          (*n_modes)++;
+        }
+    }
+
+  return array;
+}
+
+static gboolean
+is_mode_in_array (const GimpLayerMode *modes,
+                  gint                 n_modes,
+                  GimpLayerMode        mode)
+{
+  gint i;
+
+  for (i = 0; i < n_modes; i++)
+    {
+      if (modes[i] == mode)
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+GimpLayerModeGroup
+gimp_layer_mode_get_group (GimpLayerMode mode)
+{
+  if (is_mode_in_array (layer_mode_group_default,
+                        G_N_ELEMENTS (layer_mode_group_default), mode))
+    {
+      return GIMP_LAYER_MODE_GROUP_DEFAULT;
+    }
+  else if (is_mode_in_array (layer_mode_group_legacy,
+                             G_N_ELEMENTS (layer_mode_group_legacy), mode))
+    {
+      return GIMP_LAYER_MODE_GROUP_LEGACY;
+    }
+
+  return GIMP_LAYER_MODE_GROUP_DEFAULT;
+}
+
+const GimpLayerMode *
+gimp_layer_mode_get_group_array (GimpLayerModeGroup  group,
+                                 gint               *n_modes)
+{
+  g_return_val_if_fail (n_modes != NULL, NULL);
+
+  switch (group)
+    {
+    case GIMP_LAYER_MODE_GROUP_DEFAULT:
+      *n_modes = G_N_ELEMENTS (layer_mode_group_default);
+      return layer_mode_group_default;
+
+    case GIMP_LAYER_MODE_GROUP_LEGACY:
+      *n_modes = G_N_ELEMENTS (layer_mode_group_legacy);
+      return layer_mode_group_legacy;
+
+    default:
+      g_return_val_if_reached (NULL);
+    }
+}
+
+gboolean
+gimp_layer_mode_get_for_group (GimpLayerMode       old_mode,
+                               GimpLayerModeGroup  new_group,
+                               GimpLayerMode      *new_mode)
+{
+  gint i;
+
+  g_return_val_if_fail (new_mode != NULL, FALSE);
+
+  for (i = 0; i < G_N_ELEMENTS (layer_mode_groups); i++)
+    {
+      if (is_mode_in_array (layer_mode_groups[i], 2, old_mode))
+        {
+          *new_mode = layer_mode_groups[i][new_group];
+
+          if (*new_mode != -1)
+            return TRUE;
+
+          return FALSE;
+        }
+    }
+
+  *new_mode = -1;
+
+  return FALSE;
+}
+
+const Babl *
+gimp_layer_mode_get_format (GimpLayerMode           mode,
+                            GimpLayerColorSpace     blend_space,
+                            GimpLayerColorSpace     composite_space,
+                            GimpLayerCompositeMode  composite_mode,
+                            const Babl             *preferred_format)
+{
+  GimpLayerCompositeRegion composite_region;
+
+  /* for now, all modes perform i/o in the composite space. */
+  (void) mode;
+  (void) blend_space;
+
+  if (composite_space == GIMP_LAYER_COLOR_SPACE_AUTO)
+    composite_space = gimp_layer_mode_get_composite_space (mode);
+
+  if (composite_mode == GIMP_LAYER_COMPOSITE_AUTO)
+    composite_mode = gimp_layer_mode_get_composite_mode (mode);
+
+  composite_region = gimp_layer_mode_get_included_region (mode, composite_mode);
+
+  if (gimp_layer_mode_is_alpha_only (mode))
+    {
+      if (composite_region != GIMP_LAYER_COMPOSITE_REGION_UNION)
+        {
+          /* alpha-only layer modes don't combine colors in non-union composite
+           * modes, hence we can disregard the composite space.
+           */
+          composite_space = GIMP_LAYER_COLOR_SPACE_AUTO;
+        }
+    }
+  else if (gimp_layer_mode_is_trivial (mode))
+    {
+      if (! (composite_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION))
+        {
+          /* trivial layer modes don't combine colors when only the source
+           * region is included, hence we can disregard the composite space.
+           */
+          composite_space = GIMP_LAYER_COLOR_SPACE_AUTO;
+        }
+    }
+
+  switch (composite_space)
+    {
+    case GIMP_LAYER_COLOR_SPACE_AUTO:
+      /* compositing is color-space agnostic.  return a format that has a fast
+       * conversion path to/from the preferred format.
+       */
+      if (! preferred_format || gimp_babl_format_get_linear (preferred_format))
+        return babl_format ("RGBA float");
+      else
+        return babl_format ("R'G'B'A float");
+
+    case GIMP_LAYER_COLOR_SPACE_RGB_LINEAR:
+      return babl_format ("RGBA float");
+
+    case GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL:
+      return babl_format ("R'G'B'A float");
+
+    case GIMP_LAYER_COLOR_SPACE_LAB:
+      return babl_format ("CIE Lab alpha float");
+    }
+
+  g_return_val_if_reached (babl_format ("RGBA float"));
+}
+
+GimpLayerCompositeRegion
+gimp_layer_mode_get_included_region (GimpLayerMode          mode,
+                                     GimpLayerCompositeMode composite_mode)
+{
+  if (composite_mode == GIMP_LAYER_COMPOSITE_AUTO)
+    composite_mode = gimp_layer_mode_get_composite_mode (mode);
+
+  switch (composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+      return GIMP_LAYER_COMPOSITE_REGION_UNION;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      return GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      return GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      return GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
+
+    default:
+      g_return_val_if_reached (GIMP_LAYER_COMPOSITE_REGION_INTERSECTION);
+    }
+}