Color and Tint modifiers.

@@ -0,0 +123,4 @@
+    for (const int64_t point_i : points) {
+      float3 factor = cmd.hsv;
+      if (use_curve) {
+        const float curve_input = points.size() >= 2 ? (float(point_i - points.first()) /

@@ -2542,11 +2544,10 @@ typedef enum GreasePencilModifierColorMode {
 } GreasePencilModifierColorMode;
 
 typedef enum GreasePencilOpacityModifierFlag {
-  MOD_GREASE_PENCIL_OPACITY_OPEN_INFLUENCE_PANEL = (1 << 0),

@@ -7695,13 +7720,6 @@ static void rna_def_modifier_grease_pencil_opacity(BlenderRNA *brna)
       srna, "rna_GreasePencilOpacityModifier_vertex_group_name_set");
   rna_def_modifier_grease_pencil_custom_curve(srna);
 
-  prop = RNA_def_property(srna, "open_influence_panel", PROP_BOOLEAN, PROP_NONE);

@@ -0,0 +45,4 @@
+namespace blender {
+
+using bke::greasepencil::Drawing;
+using bke::greasepencil::FramesMapKey;

@@ -0,0 +104,4 @@
+                                const GreasePencilColorModifierData &cmd,
+                                bke::CurvesGeometry &curves,
+                                const IndexMask &curves_mask,
+                                const MutableSpan<ColorGeometry4f> point_colors)

@@ -0,0 +109,4 @@
+  const bool use_curve = (cmd.influence.flag & GREASE_PENCIL_INFLUENCE_USE_CUSTOM_CURVE);
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::MutableAttributeAccessor attributes = curves.attributes_for_write();

@@ -0,0 +110,4 @@
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::MutableAttributeAccessor attributes = curves.attributes_for_write();
+  VArray<int> stroke_materials =

@@ -0,0 +167,4 @@
+
+  bke::CurvesGeometry &curves = drawing.strokes_for_write();
+  IndexMaskMemory mask_memory;
+  IndexMask curves_mask = modifier::greasepencil::get_filtered_stroke_mask(

@@ -0,0 +198,4 @@
+  const int frame = scene->r.cfra;
+
+  GreasePencil *grease_pencil = geometry_set->get_grease_pencil_for_write();
+  if (grease_pencil == nullptr) {

@@ -0,0 +203,4 @@
+  }
+
+  IndexMaskMemory mask_memory;
+  IndexMask layer_mask = modifier::greasepencil::get_filtered_layer_mask(

@@ -17,6 +17,7 @@
 #include "BKE_geometry_set.hh"
 #include "BKE_grease_pencil.hh"
 #include "BKE_modifier.hh"
+#include "BKE_screen.hh"

@@ -0,0 +166,4 @@
+                                const GreasePencilTintModifierData &tmd,
+                                bke::CurvesGeometry &curves,
+                                const IndexMask &curves_mask,
+                                const MutableSpan<ColorGeometry4f> point_colors)

@@ -0,0 +173,4 @@
+                                    GREASE_PENCIL_INFLUENCE_INVERT_VERTEX_GROUP);
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::MutableAttributeAccessor attributes = curves.attributes_for_write();

@@ -0,0 +174,4 @@
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::MutableAttributeAccessor attributes = curves.attributes_for_write();
+  VArray<int> stroke_materials =

@@ -0,0 +390,4 @@
+  const int frame = scene->r.cfra;
+
+  GreasePencil *grease_pencil = geometry_set->get_grease_pencil_for_write();
+  if (grease_pencil == nullptr) {

@@ -0,0 +395,4 @@
+  }
+
+  IndexMaskMemory mask_memory;
+  IndexMask layer_mask = modifier::greasepencil::get_filtered_layer_mask(

@@ -173,3 +173,3 @@
   uiItemR(row, ptr, "use_custom_curve", UI_ITEM_NONE, "Custom Curve", ICON_NONE);
   if (use_custom_curve) {
-    uiTemplateCurveMapping(row, ptr, "custom_curve", 0, false, false, false, false);
+    uiTemplateCurveMapping(layout, ptr, "custom_curve", 0, false, false, false, false);

@@ -0,0 +108,4 @@
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::AttributeAccessor attributes = curves.attributes();
+  const VArray<int> stroke_materials =

@@ -0,0 +134,4 @@
+  });
+}
+
+static void modify_fill_color(Object *ob,

@@ -0,0 +159,4 @@
+  fill_colors.finish();
+}
+
+static void modify_drawing(ModifierData *md, const ModifierEvalContext *ctx, Drawing &drawing)

@@ -0,0 +192,4 @@
+                                bke::GeometrySet *geometry_set)
+{
+  auto *cmd = reinterpret_cast<GreasePencilColorModifierData *>(md);
+  const Scene *scene = DEG_get_evaluated_scene(ctx->depsgraph);

@@ -0,0 +172,4 @@
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  bke::AttributeAccessor attributes = curves.attributes();
+  const VArray<int> stroke_materials =