From f46c455e8fe04be0ab5f094d2cd2bd6f8a85f8d9 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Tue, 21 Apr 2026 17:07:10 +0300
Subject: [PATCH] examples: fix bugged numbers in 2048 example (fixes #13620)

---
 examples/2048/2048.v | 51 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 13 deletions(-)

diff --git a/examples/2048/2048.v b/examples/2048/2048.v
index b648cd841..2a1e1c410 100644
--- a/examples/2048/2048.v
+++ b/examples/2048/2048.v
@@ -9,6 +9,8 @@ import time
 
 const zooming_percent_per_frame = 5
 const movement_percent_per_frame = 10
+const tile_text_size_step = 8
+const min_tile_text_size = 8
 
 const default_window_width = 544
 const default_window_height = 560
@@ -355,6 +357,21 @@ fn yx2i(y int, x int) u32 {
 	return u32(y) << 16 | u32(x)
 }
 
+@[inline]
+fn quantized_tile_text_size(size int) int {
+	if size < min_tile_text_size {
+		return 0
+	}
+	return size / tile_text_size_step * tile_text_size_step
+}
+
+@[inline]
+fn animated_tile_text_size(base_size int, animation_scale f64) int {
+	// gg/fontstash caches glyphs by size, so quantize the zoom animation to keep the
+	// atlas stable during long autoplay sessions.
+	return quantized_tile_text_size(int(animation_scale * (base_size - 1)))
+}
+
 @[inline]
 fn reverse_row(row u16) u16 {
 	part0 := u16((row & 0x000f) << 12)
@@ -1211,9 +1228,13 @@ fn (app &App) draw_one_tile(x int, y int, tidx int) {
 		xpos := xoffset + tw / 2
 		ypos := yoffset + th / 2
 		mut fmt := app.label_format(.tile)
+		text_size := animated_tile_text_size(fmt.size, anim_size)
+		if text_size == 0 {
+			return
+		}
 		fmt = gg.TextCfg{
 			...fmt
-			size: int(anim_size * (fmt.size - 1))
+			size: text_size
 		}
 		match app.tile_format {
 			.normal {
@@ -1224,20 +1245,24 @@ fn (app &App) draw_one_tile(x int, y int, tidx int) {
 			}
 			.exponent {
 				app.gg.draw_text(xpos, ypos, '2', fmt)
-				fs2 := int(f32(fmt.size) * 0.67)
-				app.gg.draw_text(xpos + app.ui.tile_size / 10, ypos - app.ui.tile_size / 8,
-					'${tidx}', gg.TextCfg{
-					...fmt
-					size:  fs2
-					align: gg.HorizontalAlign.left
-				})
+				fs2 := quantized_tile_text_size(int(f32(fmt.size) * 0.67))
+				if fs2 > 0 {
+					app.gg.draw_text(xpos + app.ui.tile_size / 10, ypos - app.ui.tile_size / 8,
+						'${tidx}', gg.TextCfg{
+						...fmt
+						size:  fs2
+						align: gg.HorizontalAlign.left
+					})
+				}
 			}
 			.shifts {
-				fs2 := int(f32(fmt.size) * 0.6)
-				app.gg.draw_text(xpos, ypos, '2<<${tidx - 1}', gg.TextCfg{
-					...fmt
-					size: fs2
-				})
+				fs2 := quantized_tile_text_size(int(f32(fmt.size) * 0.6))
+				if fs2 > 0 {
+					app.gg.draw_text(xpos, ypos, '2<<${tidx - 1}', gg.TextCfg{
+						...fmt
+						size: fs2
+					})
+				}
 			}
 			.none {} // Don't draw any text here, colors only
 			.end {} // Should never get here
-- 
2.39.5