core: add screenshot utility

2026-04-14 17:52:10 -04:00 · 2025-12-05 14:59:08 -05:00
parent 844e91dc9e
commit 6d0c56554f
17 changed files with 2894 additions and 109 deletions
--- a/core/internal/screenshot/theme.go
+++ b/core/internal/screenshot/theme.go
@@ -0,0 +1,127 @@
+package screenshot
+
+import (
+	"encoding/json"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type ThemeColors struct {
+	Background string `json:"surface"`
+	OnSurface  string `json:"on_surface"`
+	Primary    string `json:"primary"`
+}
+
+type ColorScheme struct {
+	Dark  ThemeColors `json:"dark"`
+	Light ThemeColors `json:"light"`
+}
+
+type ColorsFile struct {
+	Colors ColorScheme `json:"colors"`
+}
+
+var cachedStyle *OverlayStyle
+
+func LoadOverlayStyle() OverlayStyle {
+	if cachedStyle != nil {
+		return *cachedStyle
+	}
+
+	style := DefaultOverlayStyle
+	colors := loadColorsFile()
+	if colors == nil {
+		cachedStyle = &style
+		return style
+	}
+
+	theme := &colors.Dark
+	if isLightMode() {
+		theme = &colors.Light
+	}
+
+	if bg, ok := parseHexColor(theme.Background); ok {
+		style.BackgroundR, style.BackgroundG, style.BackgroundB = bg[0], bg[1], bg[2]
+	}
+	if text, ok := parseHexColor(theme.OnSurface); ok {
+		style.TextR, style.TextG, style.TextB = text[0], text[1], text[2]
+	}
+	if accent, ok := parseHexColor(theme.Primary); ok {
+		style.AccentR, style.AccentG, style.AccentB = accent[0], accent[1], accent[2]
+	}
+
+	cachedStyle = &style
+	return style
+}
+
+func loadColorsFile() *ColorScheme {
+	path := getColorsFilePath()
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil
+	}
+
+	var file ColorsFile
+	if err := json.Unmarshal(data, &file); err != nil {
+		return nil
+	}
+
+	return &file.Colors
+}
+
+func getColorsFilePath() string {
+	cacheDir := os.Getenv("XDG_CACHE_HOME")
+	if cacheDir == "" {
+		home := os.Getenv("HOME")
+		if home == "" {
+			return ""
+		}
+		cacheDir = filepath.Join(home, ".cache")
+	}
+	return filepath.Join(cacheDir, "DankMaterialShell", "dms-colors.json")
+}
+
+func isLightMode() bool {
+	out, err := exec.Command("gsettings", "get", "org.gnome.desktop.interface", "color-scheme").Output()
+	if err != nil {
+		return false
+	}
+
+	scheme := strings.TrimSpace(string(out))
+	switch scheme {
+	case "'prefer-light'", "'default'":
+		return true
+	}
+	return false
+}
+
+func parseHexColor(hex string) ([3]uint8, bool) {
+	hex = strings.TrimPrefix(hex, "#")
+	if len(hex) != 6 {
+		return [3]uint8{}, false
+	}
+
+	var r, g, b uint8
+	for i, ptr := range []*uint8{&r, &g, &b} {
+		val := 0
+		for j := 0; j < 2; j++ {
+			c := hex[i*2+j]
+			val *= 16
+			switch {
+			case c >= '0' && c <= '9':
+				val += int(c - '0')
+			case c >= 'a' && c <= 'f':
+				val += int(c - 'a' + 10)
+			case c >= 'A' && c <= 'F':
+				val += int(c - 'A' + 10)
+			default:
+				return [3]uint8{}, false
+			}
+		}
+		*ptr = uint8(val)
+	}
+
+	return [3]uint8{r, g, b}, true
+}