UI: Custom Windows Cursors for VSE Handles

VSE has three mouse cursors defined, WM_CURSOR_LEFT_HANDLE,
WM_CURSOR_RIGHT_HANDLE, and WM_CURSOR_BOTH_HANDLES that are currently
always using our default cursor format. This format works on all
platforms but does not support multiple sizes or antialiasing. This
PR makes these use custom cursors (created by Pablo Vazquez) on the
Windows platform.

Pull Request: https://projects.blender.org/blender/blender/pulls/125252

intern/ghost/GHOST_Types.h

@@ -360,6 +360,9 @@ typedef enum {
   GHOST_kStandardCursorBottomRightCorner,
   GHOST_kStandardCursorBottomLeftCorner,
   GHOST_kStandardCursorCopy,
+  GHOST_kStandardCursorLeftHandle,
+  GHOST_kStandardCursorRightHandle,
+  GHOST_kStandardCursorBothHandles,
   GHOST_kStandardCursorCustom,
 
 #define GHOST_kStandardCursorNumCursors (int(GHOST_kStandardCursorCustom) + 1)

intern/ghost/intern/GHOST_WindowWin32.cc

@@ -823,6 +823,16 @@ HCURSOR GHOST_WindowWin32::getStandardCursor(GHOST_TStandardCursor shape) const
     case GHOST_kStandardCursorStop:
       cursor = ::LoadImage(module, "forbidden_cursor", IMAGE_CURSOR, cx, cy, flags);
       break; /* Slashed circle */
+    case GHOST_kStandardCursorLeftHandle:
+      cursor = ::LoadImage(module, "handle_left_cursor", IMAGE_CURSOR, cx, cy, flags);
+      break;
+    case GHOST_kStandardCursorRightHandle:
+      cursor = ::LoadImage(module, "handle_right_cursor", IMAGE_CURSOR, cx, cy, flags);
+      break;
+    case GHOST_kStandardCursorBothHandles:
+      cursor = ::LoadImage(module, "handle_both_cursor", IMAGE_CURSOR, cx, cy, flags);
+      break;
+
     case GHOST_kStandardCursorDefault:
       cursor = nullptr;
       break;

release/windows/icons/winblender.rc

@@ -36,6 +36,9 @@ splitv_cursor CURSOR "cursors/splitv.cur"
 zoomin_cursor CURSOR "cursors/zoomin.cur"
 zoomout_cursor CURSOR "cursors/zoomout.cur"
 forbidden_cursor CURSOR "cursors/forbidden.cur"
+handle_left_cursor CURSOR "cursors/handle_left.cur"
+handle_right_cursor CURSOR "cursors/handle_right.cur"
+handle_both_cursor CURSOR "cursors/handle_both.cur"
 
 IDR_VERSION1 VERSIONINFO
 FILEVERSION BLEN_VER_RC_1, BLEN_VER_RC_2, BLEN_VER_RC_3, BLEN_VER_RC_4

source/blender/windowmanager/intern/wm_cursors.cc

@@ -97,6 +97,12 @@ static GHOST_TStandardCursor convert_to_ghost_standard_cursor(WMCursorType curs)
       return GHOST_kStandardCursorRightArrow;
     case WM_CURSOR_W_ARROW:
       return GHOST_kStandardCursorLeftArrow;
+    case WM_CURSOR_LEFT_HANDLE:
+      return GHOST_kStandardCursorLeftHandle;
+    case WM_CURSOR_RIGHT_HANDLE:
+      return GHOST_kStandardCursorRightHandle;
+    case WM_CURSOR_BOTH_HANDLES:
+      return GHOST_kStandardCursorBothHandles;
     default:
       return GHOST_kStandardCursorCustom;
   }