add automation flatten function

Implements #4756.

.reuse/dep5

@@ -209,6 +209,14 @@ Comment:
   The files have been slightly modified.
   From https://github.com/microsoft/fluentui-system-icons.
 
+Files:
+  resources/icons/iconpark/*.svg
+Copyright: IconPark contributors <https://github.com/bytedance/IconPark>
+License: Apache-2.0
+Comment:
+  The files have been slightly modified.
+  From https://iconpark.oceanengine.com/official.
+
 Files: resources/icons/font-awesome/*.svg
 Copyright: Font Awesome project
 License: CC-BY-4.0

inc/dsp/automation_function.h

@@ -28,17 +28,19 @@ typedef enum AutomationFunctionType
 {
   AUTOMATION_FUNCTION_FLIP_HORIZONTAL,
   AUTOMATION_FUNCTION_FLIP_VERTICAL,
+  AUTOMATION_FUNCTION_FLATTEN,
 } AutomationFunctionType;
 
-static const cyaml_strval_t automation_function_type_strings[] = {
-  {N_ ("Flip H"),  AUTOMATION_FUNCTION_FLIP_HORIZONTAL},
-  { N_ ("Flip V"), AUTOMATION_FUNCTION_FLIP_VERTICAL  },
+static const char * automation_function_type_strings[] = {
+  N_ ("Flip H"),
+  N_ ("Flip V"),
+  N_ ("Flatten"),
 };
 
 static inline const char *
 automation_function_type_to_string (AutomationFunctionType type)
 {
-  return automation_function_type_strings[type].str;
+  return automation_function_type_strings[type];
 }
 
 /**

resources/icons/iconpark/figma-flatten-selection.svg

@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 48 48"
+   fill="none"
+   version="1.1"
+   id="svg4"
+   sodipodi:docname="figma-flatten-selection.svg"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25, custom)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="namedview4"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="33.666667"
+     inkscape:cx="11.985149"
+     inkscape:cy="12"
+     inkscape:window-width="2560"
+     inkscape:window-height="1023"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg4" />
+  <path
+     d="M32 18L24 26L16 18"
+     stroke="#333"
+     stroke-width="4"
+     stroke-linecap="round"
+     stroke-linejoin="round"
+     id="path1"
+     style="stroke:#f2f2f2" />
+  <path
+     d="M36 42H12"
+     stroke="#333"
+     stroke-width="4"
+     stroke-linecap="round"
+     stroke-linejoin="round"
+     id="path2"
+     style="stroke:#f2f2f2" />
+  <path
+     d="M42 34H6"
+     stroke="#333"
+     stroke-width="4"
+     stroke-linecap="round"
+     stroke-linejoin="round"
+     id="path3"
+     style="stroke:#f2f2f2" />
+  <path
+     d="M24 6V26"
+     stroke="#333"
+     stroke-width="4"
+     stroke-linecap="round"
+     stroke-linejoin="round"
+     id="path4"
+     style="stroke:#f2f2f2" />
+</svg>

resources/ui/editor_toolbar.ui

@@ -205,6 +205,12 @@
   </menu>
   <menu id="automation_functions_menu">
     <section>
+      <item>
+        <attribute name="label" translatable="yes">Flatten</attribute>
+        <attribute name="action">editor-toolbar.editor-function</attribute>
+        <attribute name="target">flatten</attribute>
+        <attribute name="icon">iconpark-figma-flatten-selection</attribute>
+      </item>
       <submenu>
         <attribute name="label" translatable="yes">Flip</attribute>
         <item>

scripts/gen-gtk-resources-xml.scm

@@ -120,7 +120,7 @@ Args:
                      (string-suffix? ".png" f))))))
            '("arena" "gnome-builder" "gnome-icon-library" "ext"
              "fork-awesome" "font-awesome"
-             "fluentui" "jam-icons" "box-icons"))
+             "fluentui" "jam-icons" "box-icons" "iconpark"))
 
          ;; insert standard gtk menus
          ;; (see GtkApplication docs)

src/actions/actions.c

@@ -2531,6 +2531,10 @@ DEFINE_SIMPLE (activate_editor_function)
           {
             do_automation_func (AUTOMATION_FUNCTION_FLIP_VERTICAL);
           }
+        else if (string_is_equal (str, "flatten"))
+          {
+            do_automation_func (AUTOMATION_FUNCTION_FLATTEN);
+          }
         else
           {
             g_return_if_reached ();

src/dsp/automation_function.c

@@ -1,7 +1,5 @@
+// SPDX-FileCopyrightText: © 2020 Alexandros Theodotou <alex@zrythm.org>
 // SPDX-License-Identifier: LicenseRef-ZrythmLicense
-/*
- * Copyright (C) 2020 Alexandros Theodotou <alex at zrythm dot org>
- */
 
 #include "dsp/automation_function.h"
 #include "dsp/engine.h"
@@ -33,6 +31,18 @@ flip (AutomationSelections * sel, bool vertical)
     }
 }
 
+static void
+flatten (AutomationSelections * sel)
+{
+  for (int i = 0; i < sel->num_automation_points; i++)
+    {
+      AutomationPoint * ap = sel->automation_points[i];
+
+      ap->curve_opts.curviness = 1.0;
+      ap->curve_opts.algo = CURVE_ALGORITHM_PULSE;
+    }
+}
+
 /**
  * Applies the given action to the given selections.
  *
@@ -55,6 +65,9 @@ automation_function_apply (
     case AUTOMATION_FUNCTION_FLIP_VERTICAL:
       flip ((AutomationSelections *) sel, true);
       break;
+    case AUTOMATION_FUNCTION_FLATTEN:
+      flatten ((AutomationSelections *) sel);
+      break;
     }
 
   /* set last action */