Reverts UI font change and adds setting for AA sd fonts

lib/EpdFont/scripts/build-font-ids.sh

@@ -99,12 +99,3 @@ ruby -rdigest -e 'puts [
   "./notosans_8_regular.h",
 ].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
 ))"
-
-echo ""
-echo "// Font ID 0 is reserved as the \"not found\" sentinel."
-echo "// Guard against any hash accidentally producing 0."
-for id in NOTOSERIF_12 NOTOSERIF_14 NOTOSERIF_16 NOTOSERIF_18 \
-          NOTOSANS_12 NOTOSANS_14 NOTOSANS_16 NOTOSANS_18 \
-          UI_10 UI_12 SMALL; do
-  echo "static_assert(${id}_FONT_ID != 0, \"Font ID collision with sentinel\");"
-done

lib/EpdFont/scripts/convert-builtin-fonts.sh

@@ -42,11 +42,8 @@ for size in ${UI_FONT_SIZES[@]}; do
     # (fontstack is ordered by descending priority).
     viet_path="../builtinFonts/source/Ubuntu/Ubuntu-Vietnamese-${style}.ttf"
     output_path="../builtinFonts/${font_name}.h"
-    # 2-bit like the reader fonts: full coverage renders solid in BW mode and
-    # partial edge coverage dithers (GfxRenderer renderCharImpl), so UI text is
-    # anti-aliased on 1-bit panels and blends properly in grayscale passes.
     python fontconvert.py $font_name $size $font_path $hebrew_path $viet_path \
-      --2bit --compress --additional-intervals 0x05D0,0x05EA > $output_path
+      --additional-intervals 0x05D0,0x05EA > $output_path
     echo "Generated $output_path"
   done
 done
@@ -54,7 +51,7 @@ done
 python fontconvert.py notosans_8_regular 8 \
   ../builtinFonts/source/NotoSans/NotoSans-Regular.ttf \
   ../builtinFonts/source/NotoSansHebrew/NotoSansHebrew-Regular.ttf \
-  --2bit --compress --additional-intervals 0x05D0,0x05EA > ../builtinFonts/notosans_8_regular.h
+  --additional-intervals 0x05D0,0x05EA > ../builtinFonts/notosans_8_regular.h
 
 echo ""
 echo "Running compression verification..."

lib/GfxRenderer/GfxRenderer.cpp

@@ -282,12 +282,15 @@ static void renderCharImpl(const GfxRenderer& renderer, GfxRenderer::RenderMode
           const uint8_t bmpVal = 3 - ((byte >> bit_index) & 0x3);
 
           if (renderMode == GfxRenderer::BW && bmpVal < 3) {
-            // Full coverage is solid ink; partial (anti-aliased edge) coverage
-            // dithers with the same period-2 patterns as fillRectDither
-            // (dark grey = 50% checkerboard, light grey = 25%), so 2-bit fonts
-            // render anti-aliased on BW passes instead of bolding every edge
-            // pixel to black. Skipped pixels leave the background untouched.
-            if (bmpVal == 0 || (bmpVal == 1 && ((screenX + screenY) & 1) == 0) ||
+            // Default: gray pixels paint solid black. Required when grayscale
+            // passes follow (their LUT lightens pixels it assumes were just
+            // driven solid black), and it is the plain non-AA look otherwise.
+            // Fast AA: partial (anti-aliased edge) coverage dithers with the
+            // same period-2 patterns as fillRectDither (dark grey = 50%
+            // checkerboard, light grey = 25%), approximating AA in a single
+            // BW pass. Skipped pixels leave the background untouched.
+            if (!renderer.isFastAntiAliasing() || bmpVal == 0 ||
+                (bmpVal == 1 && ((screenX + screenY) & 1) == 0) ||
                 (bmpVal == 2 && (screenX & 1) == 0 && (screenY & 1) == 0)) {
               renderer.drawPixel(screenX, screenY, pixelState);
             }

lib/GfxRenderer/GfxRenderer.h

@@ -44,6 +44,13 @@ class GfxRenderer {
   RenderMode renderMode;
   Orientation orientation;
   bool fadingFix;
+  // Fast text anti-aliasing: when set, BW-mode rendering of 2-bit glyphs
+  // dithers partial-coverage (gray) pixels instead of painting them solid
+  // black, approximating AA in a single BW pass with no grayscale refresh.
+  // Must stay false when grayscale LSB/MSB passes follow the BW render: the
+  // gray LUT lightens pixels it assumes were just driven solid black, and
+  // dither-skipped white pixels would take its white-drive frames unopposed.
+  bool fastAntiAliasing = false;
   uint8_t* frameBuffer = nullptr;
   uint16_t panelWidth = HalDisplay::DISPLAY_WIDTH;
   uint16_t panelHeight = HalDisplay::DISPLAY_HEIGHT;
@@ -224,6 +231,8 @@ class GfxRenderer {
   // Grayscale functions
   void setRenderMode(const RenderMode mode) { this->renderMode = mode; }
   RenderMode getRenderMode() const { return renderMode; }
+  void setFastAntiAliasing(const bool enabled) { this->fastAntiAliasing = enabled; }
+  bool isFastAntiAliasing() const { return fastAntiAliasing; }
   // Grayscale preconditioning settle pass (no-op on X4). The rect overload
   // takes the gray region in LOGICAL screen coordinates and rotates it to the
   // panel; the no-arg overload settles the full frame. Call after the BW base

lib/I18n/translations/english.yaml

@@ -66,6 +66,8 @@ STR_SLEEP_COVER_MODE: "Sleep Screen Cover Mode"
 STR_HIDE_BATTERY: "Hide Battery %"
 STR_EXTRA_SPACING: "Extra Paragraph Spacing"
 STR_TEXT_AA: "Text Anti-Aliasing"
+STR_TEXT_AA_FULL: "Full"
+STR_TEXT_AA_FAST: "Fast"
 STR_IMAGES: "Images"
 STR_IMAGES_DISPLAY: "Display"
 STR_IMAGES_PLACEHOLDER: "Placeholder"