add watermark plugin for gimp

Signed-off-by: Robert Günzler <r@gnzler.io>

1 files changed, 84 insertions, 0 deletions

diff --git a/.local/share/GIMP/plug-ins/watermark.py b/.local/share/GIMP/plug-ins/watermark.py
new file mode 100755
index 0000000..0f9f1f9
--- /dev/null
+++ b/.local/share/GIMP/plug-ins/watermark.py
@@ -0,0 +1,84 @@
+#!/usr/bin/python
+
+from datetime import date
+from gimpfu import *
+
+def watermarkfu(timg, tdrawable,
+                watermark,
+                anotherline="<today>",
+                scalefactor_text=12.0,
+                scalefactor_boundry=2.3,
+                watermark_opacity=16.66):
+
+    # make copy of input
+    img = pdb.gimp_image_duplicate(timg)
+
+    # simplify source image
+    img.flatten()
+
+    # expand text macro
+    anotherline = anotherline.replace("<today>",
+                                      date.today().strftime("%Y-%m-%d"))
+
+    # create text
+    text = pdb.gimp_text_layer_new(img,
+                                   "\n".join([watermark, anotherline]),
+                                   "Iosevka Ultra-Bold",
+                                   68, UNIT_POINT)
+
+    # add to image, justification doesn't work otherwise
+    img.add_layer(text, 0)
+
+    # justify text
+    pdb.gimp_text_layer_set_justification(img.layers[0], TEXT_JUSTIFY_CENTER)
+
+    # scale down text layer, maintaining ratio
+    pdb.gimp_layer_scale(img.layers[0],
+                         ((float(text.width)/text.height)*(img.height/scalefactor_text)),
+                         (img.height/scalefactor_text),
+                         TRUE)
+
+    # crate padding around text
+    pdb.gimp_layer_resize(img.layers[0],
+                          (text.width*scalefactor_boundry),
+                          (text.height*scalefactor_boundry),
+                          (((text.width*scalefactor_boundry)-text.width)/2),
+                          (((text.height*scalefactor_boundry)-text.height)/2),
+                          )
+
+    pdb.plug_in_make_seamless(img, img.layers[0])
+    pdb.plug_in_tile(img, img.layers[0], img.width, img.height, False)
+
+    # move to 0,0
+    (offx, offy) = pdb.gimp_drawable_offsets(img.layers[0])
+    pdb.gimp_layer_translate(img.layers[0], (offx*-1), (offy*-1))
+
+    # tune mode + opacity
+    pdb.gimp_layer_set_opacity(img.layers[0], watermark_opacity)
+    pdb.gimp_layer_set_mode(img.layers[0], HARDLIGHT_MODE)
+
+    # show to user
+    pdb.gimp_display_new(img)
+
+
+register(
+    "python_fu_watermark",
+    "WatermarkFu",
+    "WatermarkFu",
+    "robertgzr",
+    "robertgzr",
+    "2023",
+    "<Image>/Filters/Render/WatermarkFu",
+    "RGB*, GRAY*",
+    [
+        (PF_STRING, "watermark", "watermark text", ""),
+        (PF_STRING, "anotherline", "another line", "<today>"),
+        (PF_FLOAT, "scalefactor_text", "scalefactor text", 12.0),
+        (PF_FLOAT, "scalefactor_boundry", "scalefactor boundry", 2.3),
+        (PF_FLOAT, "watermark_opacity", "watermark opacity", 16.66),
+    ],
+    [],
+    watermarkfu,
+)
+
+main()