From 48aaf821a5758d7e0f03c4f726927d45c6db6761 Mon Sep 17 00:00:00 2001
From: jpirnay <jens@pirnay.com>
Date: Mon, 4 May 2026 15:33:47 +0200
Subject: [PATCH] Clear cache on prewarm

---
 lib/EpdFont/FontDecompressor.h       | 2 +-
 lib/GfxRenderer/FontCacheManager.cpp | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/EpdFont/FontDecompressor.h b/lib/EpdFont/FontDecompressor.h
index 8f574dba..afb9c61c 100644
--- a/lib/EpdFont/FontDecompressor.h
+++ b/lib/EpdFont/FontDecompressor.h
@@ -7,7 +7,7 @@
 class FontDecompressor {
  public:
   static constexpr uint16_t MAX_PAGE_GLYPHS = 512;
-  static constexpr uint8_t MAX_PAGE_SLOTS = 4;  // One per font style (R/B/I/BI)
+  static constexpr uint8_t MAX_PAGE_SLOTS = 8;  // Provide enough slots for heavily stylized HTML pages
 
   FontDecompressor() = default;
   ~FontDecompressor();
diff --git a/lib/GfxRenderer/FontCacheManager.cpp b/lib/GfxRenderer/FontCacheManager.cpp
index b55fdf08..36620f2e 100644
--- a/lib/GfxRenderer/FontCacheManager.cpp
+++ b/lib/GfxRenderer/FontCacheManager.cpp
@@ -24,6 +24,8 @@ void FontCacheManager::clearCache() {
 }
 
 void FontCacheManager::prewarmCache(int fontId, const char* utf8Text, uint8_t styleMask) {
+  clearCache();
+
   // SD card font prewarm path: prewarm all requested styles in one call
   auto sdIt = sdCardFonts_.find(fontId);
   if (sdIt != sdCardFonts_.end()) {