From 100d19762e5c3204c1a34bfbe98aec1c88e5de56 Mon Sep 17 00:00:00 2001
From: Sebastian Nieto <sebanieto@gmail.com>
Date: Tue, 22 Sep 2026 00:39:47 -0300
Subject: [PATCH] fix(display): render authentic DSEG7 34pt font during
 transition for pixel-perfect match

---
 sketch/obd2_gauge/meter.h | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/sketch/obd2_gauge/meter.h b/sketch/obd2_gauge/meter.h
index b2cc95b..fb8ae09 100644
--- a/sketch/obd2_gauge/meter.h
+++ b/sketch/obd2_gauge/meter.h
@@ -1374,10 +1374,16 @@ inline void renderPage0ToSprite(TFT_eSprite &s, int x_offset, int y_slice, int s
       drawQuadBarBlockToSprite(s, qx, qy, i, bCol, slice_h);
     }
 
-    // 4. Digital value string
+    // 4. Digital value string using authentic DSEG7 34pt font (pixel-perfect match with resting screen)
     String numStr = (val <= -900.0f) ? "---" : String(val, digit);
-    s.setTextColor(priCol);
-    s.drawRightString(numStr.c_str(), qx + 152, qy + 74, 4);
+    int textY = qy + 74;
+    if (textY < slice_h && textY + 40 > 0) {
+      s.fontLoaded = true;
+      s.setTextColor(priCol, TFT_BLACK);
+      s.setTextPadding(0);
+      s.drawRightString(numStr.c_str(), qx + 152, textY, 1);
+      s.fontLoaded = false;
+    }
   }
 
   // 5. Eco Badge if active
@@ -1470,10 +1476,16 @@ inline void renderPage1ToSprite(TFT_eSprite &s, int x_offset, int y_slice, int s
     if (fillW < 4) fillW = 4;
     s.fillRoundRect(barX, barY, fillW, 8, 3, accentCol);
 
-    // Value text (clean built-in font 4: zero padding artifacts, zero distortion)
+    // Value text using authentic DSEG7 34pt font matching drawTriTempCard
     String numStr = (val <= -900.0f) ? "---" : (isInt ? String((int)val) : String(val, 1));
-    s.setTextColor(accentCol, cardBg);
-    s.drawRightString(numStr.c_str(), cardX + 262, cardY + 24, 4);
+    int numY = cardY + 22;
+    if (numY < slice_h && numY + 40 > 0) {
+      s.fontLoaded = true;
+      s.setTextColor(accentCol, cardBg);
+      s.setTextPadding(0);
+      s.drawRightString(numStr.c_str(), cardX + 262, numY, 1);
+      s.fontLoaded = false;
+    }
 
     s.setTextColor(0xC618, cardBg);
     s.drawString("`C", cardX + 268, cardY + 32, 2);
@@ -1494,7 +1506,9 @@ inline void animateSlideTransition(bool swipeLeft) {
   }
   spr.setTextFont(1);       // CRITICAL: initializes textfont=1 and clears uninitialized gfxFont=NULL
   spr.setFreeFont(NULL);    // CRITICAL: prevents crash in textWidth() when drawing Font 1 on stack sprite
-  Serial.printf(">>> [DB] Sprite created OK. Heap: %u, MaxAlloc: %u\n", ESP.getFreeHeap(), ESP.getMaxAllocHeap());
+  spr.loadFont(DSEG7_Modern_BoldItalic_34);
+  spr.fontLoaded = false;   // Default to standard fonts until DSEG7 digits are drawn
+  Serial.printf(">>> [DB] Sprite created OK with DSEG7. Heap: %u, MaxAlloc: %u\n", ESP.getFreeHeap(), ESP.getMaxAllocHeap());
 
   const uint8_t FRAMES = 28;
   // High-density sine ease-out deceleration over 28 frames:
@@ -1549,6 +1563,8 @@ inline void animateSlideTransition(bool swipeLeft) {
     delay(7); // Ultra-smooth high density pacing (~330ms total)
   }
 
+  spr.fontLoaded = true;
+  spr.unloadFont();
   spr.deleteSprite(); // Release the 25KB
   Serial.printf(">>> [DB] animateSlideTransition LEAVE (heap: %u)\n", ESP.getFreeHeap());
 }