Regarding GEGL plugin development the procedural listing
gimp-drawable-filter-get-blend-mode is extremely useful simply because it is a list of how to call GIMP Only blend modes in GEGL Plugins. Explained simply, its not about working with python or script fu, its simply about using the number list of blend modes to guide GEGL plugin development.
{ LAYER-MODE-NORMAL-LEGACY (0), LAYER-MODE-DISSOLVE (1), LAYER-MODE-BEHIND-LEGACY (2), LAYER-MODE-MULTIPLY-LEGACY (3), LAYER-MODE-SCREEN-LEGACY (4), LAYER-MODE-OVERLAY-LEGACY (5), LAYER-MODE-DIFFERENCE-LEGACY (6), LAYER-MODE-ADDITION-LEGACY (7), LAYER-MODE-SUBTRACT-LEGACY (8), LAYER-MODE-DARKEN-ONLY-LEGACY (9), LAYER-MODE-LIGHTEN-ONLY-LEGACY (10), LAYER-MODE-HSV-HUE-LEGACY (11), LAYER-MODE-HSV-SATURATION-LEGACY (12), LAYER-MODE-HSL-COLOR-LEGACY (13), LAYER-MODE-HSV-VALUE-LEGACY (14), LAYER-MODE-DIVIDE-LEGACY (15), LAYER-MODE-DODGE-LEGACY (16), LAYER-MODE-BURN-LEGACY (17), LAYER-MODE-HARDLIGHT-LEGACY (18), LAYER-MODE-SOFTLIGHT-LEGACY (19), LAYER-MODE-GRAIN-EXTRACT-LEGACY (20), LAYER-MODE-GRAIN-MERGE-LEGACY (21), LAYER-MODE-COLOR-ERASE-LEGACY (22), LAYER-MODE-OVERLAY (23), LAYER-MODE-LCH-HUE (24), LAYER-MODE-LCH-CHROMA (25), LAYER-MODE-LCH-COLOR (26), LAYER-MODE-LCH-LIGHTNESS (27), LAYER-MODE-NORMAL (28), LAYER-MODE-BEHIND (29), LAYER-MODE-MULTIPLY (30), LAYER-MODE-SCREEN (31), LAYER-MODE-DIFFERENCE (32), LAYER-MODE-ADDITION (33), LAYER-MODE-SUBTRACT (34), LAYER-MODE-DARKEN-ONLY (35), LAYER-MODE-LIGHTEN-ONLY (36), LAYER-MODE-HSV-HUE (37), LAYER-MODE-HSV-SATURATION (38), LAYER-MODE-HSL-COLOR (39), LAYER-MODE-HSV-VALUE (40), LAYER-MODE-DIVIDE (41), LAYER-MODE-DODGE (42), LAYER-MODE-BURN (43), LAYER-MODE-HARDLIGHT (44), LAYER-MODE-SOFTLIGHT (45), LAYER-MODE-GRAIN-EXTRACT (46), LAYER-MODE-GRAIN-MERGE (47), LAYER-MODE-VIVID-LIGHT (48), LAYER-MODE-PIN-LIGHT (49), LAYER-MODE-LINEAR-LIGHT (50), LAYER-MODE-HARD-MIX (51), LAYER-MODE-EXCLUSION (52), LAYER-MODE-LINEAR-BURN (53), LAYER-MODE-LUMA-DARKEN-ONLY (54), LAYER-MODE-LUMA-LIGHTEN-ONLY (55), LAYER-MODE-LUMINANCE (56), LAYER-MODE-COLOR-ERASE (57), LAYER-MODE-ERASE (58), LAYER-MODE-MERGE (59), LAYER-MODE-SPLIT (60), LAYER-MODE-PASS-THROUGH (61), LAYER-MODE-REPLACE (62) }, default LAYER-MODE-NORMAL-LEGACY (0)
Look at the code listing above and note GEGL does **not** have native blend modes that do HSL Color, HSV Hue and Grain Merge, so we will have to call these ones.
Blend mode (39) is HSL Color
Blend Mode (47) is in Grain Merge
Blend mode (37) is HSV Hue
Blend Mode (57) is Color Erase
and you can figure out the rest by looking at the code.
And we can see this actualized in my plugin code here
hslcolor = gegl_node_new_child (gegl,
"operation", "gimp:layer-mode", "layer-mode", 39, "composite-mode", 0, "blend-space", 1, NULL);
And just to make things even simpler I made a PDF list of all the GIMP Only blend modes GEGL can call here. The PDF is recommended but because its possible in the future some numbers may change (breaking my plugins by changing their blend mode) you will have to use
gimp-drawable-filter-get-blend-mode to fix them if I'm not around. That will stay up to date if any new numbers are added or if numbers are removed.
If any if you ever decide to make a GEGL plugin you will have much fancier options if you use GIMP exclusive blend modes for your GEGL plugin. Hopefully one day someone other then me makes a third party GEGL plugin with GIMP exclusive blend modes in it.
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