91 lines
1.7 KiB
Go
91 lines
1.7 KiB
Go
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// Copyright 2019 The Walk Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package walk
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var iconCache *IconCache
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func init() {
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AppendToWalkInit(func() {
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iconCache = NewIconCache()
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})
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}
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type IconCache struct {
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imageAndDPI2Bitmap map[imageAndDPI]*Bitmap
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imageAndDPI2Icon map[imageAndDPI]*Icon
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}
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type imageAndDPI struct {
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image Image
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dpi int
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}
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func NewIconCache() *IconCache {
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return &IconCache{
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imageAndDPI2Bitmap: make(map[imageAndDPI]*Bitmap),
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imageAndDPI2Icon: make(map[imageAndDPI]*Icon),
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}
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}
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func (ic *IconCache) Clear() {
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for key, bmp := range ic.imageAndDPI2Bitmap {
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bmp.Dispose()
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delete(ic.imageAndDPI2Bitmap, key)
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}
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for key, ico := range ic.imageAndDPI2Icon {
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ico.Dispose()
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delete(ic.imageAndDPI2Icon, key)
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}
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}
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func (ic *IconCache) Dispose() {
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ic.Clear()
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}
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func (ic *IconCache) Bitmap(image Image, dpi int) (*Bitmap, error) {
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key := imageAndDPI{image, dpi}
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if bmp, ok := ic.imageAndDPI2Bitmap[key]; ok {
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return bmp, nil
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}
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size := SizeFrom96DPI(image.Size(), dpi)
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bmp, err := NewBitmapFromImageWithSize(image, size)
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if err != nil {
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return nil, err
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}
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ic.imageAndDPI2Bitmap[key] = bmp
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return bmp, nil
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}
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func (ic *IconCache) Icon(image Image, dpi int) (*Icon, error) {
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key := imageAndDPI{image, dpi}
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if ico, ok := ic.imageAndDPI2Icon[key]; ok {
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return ico, nil
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}
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if ico, ok := image.(*Icon); ok {
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if ico.handleForDPI(dpi) != 0 {
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ic.imageAndDPI2Icon[key] = ico
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return ico, nil
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}
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}
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ico, err := newIconFromImageForDPI(image, dpi)
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if err != nil {
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return nil, err
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}
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ic.imageAndDPI2Icon[key] = ico
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return ico, nil
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}
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