cursor_darwin.go

// Copyright ©2021-2022 by Richard A. Wilkes. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, version 2.0. If a copy of the MPL was not distributed with
// this file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// This Source Code Form is "Incompatible With Secondary Licenses", as
// defined by the Mozilla Public License, version 2.0.

package unison

import (
	"image"

	"github.com/ddkwork/golibrary/mylog"
	"github.com/ddkwork/toolbox/errs"
	"github.com/ddkwork/unison/internal/glfw"
	"golang.org/x/image/draw"
)

// NewCursor creates a new custom cursor from an image.
func NewCursor(img *Image, hotSpot Point) *Cursor {
	nrgba := mylog.Check2(img.ToNRGBA())

	// glfw doesn't take the high resolution cursors properly, so scale them down, if needed
	logicalSize := img.LogicalSize()
	size := img.Size()
	if logicalSize != size {
		dstRect := image.Rect(0, 0, int(logicalSize.Width), int(logicalSize.Height))
		dst := image.NewNRGBA(dstRect)
		draw.CatmullRom.Scale(dst, dstRect, nrgba, image.Rect(0, 0, int(size.Width), int(size.Height)),
			draw.Over, nil)
		nrgba = dst
	}

	return glfw.CreateCursor(nrgba, int(hotSpot.X), int(hotSpot.Y))
}