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Render preview synchronously to avoid flashing

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This commit is contained in:
Kovid Goyal
2024-05-18 10:02:16 +05:30
parent e050557db7
commit 13a6ff25a2
1 changed files with 25 additions and 10 deletions
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35
kittens/choose_fonts/face.go
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@@ -22,6 +22,7 @@ type face_panel struct {
family, which string
settings faces_settings
current_preview *RenderedSampleTransmit
current_preview_key faces_preview_key
preview_cache map[faces_preview_key]map[string]RenderedSampleTransmit
preview_cache_mutex sync.Mutex
}
@@ -129,6 +130,19 @@ func (self *handler) draw_preview_header(x int) {
self.lp.QueueWriteString(self.lp.SprintStyled("dim", p))
}
func (self *face_panel) render_preview(key faces_preview_key) {
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
}
func (self *face_panel) draw_screen() (err error) {
lp := self.handler.lp
lp.SetCursorVisible(false)
@@ -156,22 +170,14 @@ func (self *face_panel) draw_screen() (err error) {
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.current_preview_key = key
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.render_preview(key)
self.handler.lp.WakeupMainThread()
}()
return
@@ -259,6 +265,15 @@ func (self *face_panel) on_click(id string) (err error) {
}
}
}
// Render preview synchronously to void flashing
key := self.current_preview_key
key.settings = self.settings
self.preview_cache_mutex.Lock()
previews := self.preview_cache[key]
self.preview_cache_mutex.Unlock()
if len(previews) < 4 {
self.render_preview(key)
}
return self.handler.draw_screen()
}