Add framebuffer lending for memory-intensive builds

Temporarily release framebuffer memory during section pagination to reduce heap pressure. The framebuffer can be released before memory-intensive operations and restored afterward, allowing BLE stack startup threshold to be lowered from 80KB to 70KB. Implements RAII-style FrameBufferBuildLoan class to ensure proper cleanup and automatic restart on restoration failure.
2026-07-09 00:04:11 -04:00
parent f3da5e4f06
commit 05c1e9aa46
15 changed files with 205 additions and 147 deletions
@@ -250,6 +250,13 @@ class GfxRenderer {
  // Font helpers
  const uint8_t* getGlyphBitmap(const EpdFontData* fontData, const EpdGlyph* glyph) const;

+  // Lend the framebuffer to memory-hungry phases such as section pagination.
+  // Nothing may draw/display while it is released. restore returns the buffer
+  // white, so callers must redraw the full screen afterward.
+  void releaseFrameBufferForBuild();
+  bool restoreFrameBufferAfterBuild();
+  bool hasFrameBuffer() const { return frameBuffer != nullptr; }
+
  // Low level functions
  uint8_t* getFrameBuffer() const;
  size_t getBufferSize() const;