logo.go RawHistoryFolder

1// Package component provides reusable GTK UI components.
2package component
3
4import (
5	"errors"
6	"sync"
7
8	"github.com/bnema/dumber/assets"
9	"github.com/bnema/puregotk/v4/gdk"
10	"github.com/bnema/puregotk/v4/glib"
11)
12
13var errLogoDecode = errors.New("logo decode failed")
14
15var (
16	logoTexture     *gdk.Texture
17	logoTextureOnce sync.Once
18	// logoAssetBytes supplies the raster logo bytes. Overridden in tests to
19	// count requests without native decoding.
20	logoAssetBytes = func() []byte { return assets.LogoPNG512 }
21	// logoDecodeTexture converts raster bytes to a texture. Overridden in
22	// tests with a fake; production keeps GBytes/texture lifetime by
23	// releasing the temporary byte reference after the native constructor
24	// no longer needs it.
25	logoDecodeTexture = func(data []byte) (*gdk.Texture, error) {
26		bytes := glib.NewBytes(data, uint(len(data)))
27		if bytes == nil {
28			return nil, errLogoDecode
29		}
30		texture, err := gdk.NewTextureFromBytes(bytes)
31		bytes.Unref()
32		if err != nil {
33			return nil, err
34		}
35		return texture, nil
36	}
37)
38
39// GetLogoTexture returns a cached GDK texture of the dumber logo.
40// Safe to call from any goroutine; lazily initializes on first call.
41// Decodes the packaged 512-pixel PNG raster asset; the displayed size and
42// one-texture-per-process lifetime are unchanged.
43// Returns nil if the logo cannot be loaded.
44func GetLogoTexture() *gdk.Texture {
45	logoTextureOnce.Do(func() {
46		data := logoAssetBytes()
47		if len(data) == 0 {
48			return
49		}
50		texture, err := logoDecodeTexture(data)
51		if err != nil || texture == nil {
52			return
53		}
54		logoTexture = texture
55	})
56	return logoTexture
57}