Work on face panel

kittens/choose_fonts/face.go

@@ -3,6 +3,7 @@ package choose_fonts
 import (
 	"fmt"
 	"kitty/tools/tui/loop"
+	"math"
 	"sync"
 )
 
@@ -19,6 +20,54 @@ type face_panel struct {
 }
 
 func (self *face_panel) draw_screen() (err error) {
+	lp := self.handler.lp
+	lp.SetCursorVisible(false)
+	sz, _ := lp.ScreenSize()
+	styled := lp.SprintStyled
+	wt := "Regular"
+	switch self.which {
+	case "bold_font":
+		wt = "Bold"
+	case "italic_font":
+		wt = "Italic"
+	case "bold_italic_font":
+		wt = "Bold-Italic font"
+	}
+
+	lines := []string{
+		self.handler.format_title(self.family+": "+wt, 0), "",
+		fmt.Sprintf("Press %s to select this face or %s to cancel. Click on a style name below to switch to it.", styled("fg=green", "Enter"), styled("fg=red", "Esc")), "",
+	}
+	_, y, str := self.handler.render_lines.InRectangle(lines, 0, 0, int(sz.WidthCells), int(sz.HeightCells), &self.handler.mouse_state, self.on_click)
+	lp.QueueWriteString(str)
+	num_lines_per_font := (int(sz.HeightCells) - y - 1) - 2
+	num_lines_needed := int(math.Ceil(100. / float64(sz.WidthCells)))
+	num_lines := max(1, min(num_lines_per_font, num_lines_needed))
+	key := faces_preview_key{settings: self.settings, width: int(sz.WidthCells * sz.CellWidth), height: int(sz.CellHeight) * num_lines}
+	self.preview_cache_mutex.Lock()
+	defer self.preview_cache_mutex.Unlock()
+	previews, found := self.preview_cache[key]
+	if !found {
+		self.preview_cache[key] = make(map[string]RenderedSampleTransmit)
+		go func() {
+			var r map[string]RenderedSampleTransmit
+			s := key.settings
+			self.handler.set_worker_error(kitty_font_backend.query("render_family_samples", map[string]any{
+				"text_style": self.handler.text_style, "font_family": s.font_family,
+				"bold_font": s.bold_font, "italic_font": s.italic_font, "bold_italic_font": s.bold_italic_font,
+				"width": key.width, "height": key.height, "output_dir": self.handler.temp_dir,
+			}, &r))
+			self.preview_cache_mutex.Lock()
+			defer self.preview_cache_mutex.Unlock()
+			self.preview_cache[key] = r
+			self.handler.lp.WakeupMainThread()
+		}()
+		return
+	}
+	if len(previews) < 4 {
+		return
+	}
+
 	return
 }