raylib: font sizes from QT should match (#36237)

* debug

* hacks everywhere but kind of works

* by font

* fix sidebar

* stash

* test update

* just use a const

* just use a const

* better

* clean up

* fix label

* simplify

* gpt5 is yet again garbage

* rm that

* clean up

* rm

* blank

* clean up

* I really don't like this but shrug

* fix

* fix experimental text

Author: sshane

selfdrive/ui/layouts/sidebar.py

@@ -216,14 +216,21 @@ def _draw_metric(self, rect: rl.Rectangle, metric: MetricData, y: float):
     # Draw border
     rl.draw_rectangle_rounded_lines_ex(metric_rect, 0.3, 10, 2, Colors.METRIC_BORDER)
 
-    # Draw label and value
-    labels = [metric.label, metric.value]
-    text_y = metric_rect.y + (metric_rect.height / 2 - len(labels) * FONT_SIZE)
-    for text in labels:
-      text_size = measure_text_cached(self._font_bold, text, FONT_SIZE)
-      text_y += text_size.y
-      text_pos = rl.Vector2(
-        metric_rect.x + 22 + (metric_rect.width - 22 - text_size.x) / 2,
-        text_y
-      )
-      rl.draw_text_ex(self._font_bold, text, text_pos, FONT_SIZE, 0, Colors.WHITE)
+    label_size = measure_text_cached(self._font_bold, metric.label, FONT_SIZE)
+    value_size = measure_text_cached(self._font_bold, metric.value, FONT_SIZE)
+    text_height = label_size.y + value_size.y
+
+    label_y = metric_rect.y + (metric_rect.height - text_height) / 2
+    value_y = label_y + label_size.y
+
+    # label
+    rl.draw_text_ex(self._font_bold, metric.label, rl.Vector2(
+      metric_rect.x + 22 + (metric_rect.width - 22 - label_size.x) / 2,
+      label_y
+    ), FONT_SIZE, 0, Colors.WHITE)
+
+    # value
+    rl.draw_text_ex(self._font_bold, metric.value, rl.Vector2(
+      metric_rect.x + 22 + (metric_rect.width - 22 - value_size.x) / 2,
+      value_y
+    ), FONT_SIZE, 0, Colors.WHITE)

selfdrive/ui/widgets/exp_mode_button.py

@@ -1,6 +1,6 @@
 import pyray as rl
 from openpilot.common.params import Params
-from openpilot.system.ui.lib.application import gui_app, FontWeight
+from openpilot.system.ui.lib.application import gui_app, FontWeight, FONT_SCALE
 from openpilot.system.ui.widgets import Widget
 
 
@@ -9,7 +9,7 @@ def __init__(self):
     super().__init__()
 
     self.img_width = 80
-    self.horizontal_padding = 50
+    self.horizontal_padding = 30
     self.button_height = 125
 
     self.params = Params()
@@ -51,7 +51,7 @@ def _render(self, rect):
     # Draw text label (left aligned)
     text = "EXPERIMENTAL MODE ON" if self.experimental_mode else "CHILL MODE ON"
     text_x = rect.x + self.horizontal_padding
-    text_y = rect.y + rect.height / 2 - 45 // 2  # Center vertically
+    text_y = rect.y + rect.height / 2 - 45 * FONT_SCALE // 2  # Center vertically
 
     rl.draw_text_ex(gui_app.font(FontWeight.NORMAL), text, rl.Vector2(int(text_x), int(text_y)), 45, 0, rl.BLACK)
 

system/ui/lib/application.py

@@ -30,6 +30,10 @@
 DEFAULT_TEXT_SIZE = 60
 DEFAULT_TEXT_COLOR = rl.WHITE
 
+# Qt draws fonts accounting for ascent/descent differently, so compensate to match old styles
+# The real scales for the fonts below range from 1.212 to 1.266
+FONT_SCALE = 1.242
+
 ASSETS_DIR = files("openpilot.selfdrive").joinpath("assets")
 FONT_DIR = ASSETS_DIR.joinpath("fonts")
 
@@ -173,6 +177,7 @@ def init_window(self, title: str, fps: int = _DEFAULT_FPS):
     self._target_fps = fps
     self._set_styles()
     self._load_fonts()
+    self._patch_text_functions()
 
     if not PC:
       self._mouse.start()
@@ -356,6 +361,16 @@ def _set_styles(self):
     rl.gui_set_style(rl.GuiControl.DEFAULT, rl.GuiControlProperty.TEXT_COLOR_NORMAL, rl.color_to_int(DEFAULT_TEXT_COLOR))
     rl.gui_set_style(rl.GuiControl.DEFAULT, rl.GuiControlProperty.BASE_COLOR_NORMAL, rl.color_to_int(rl.Color(50, 50, 50, 255)))
 
+  def _patch_text_functions(self):
+    # Wrap pyray text APIs to apply a global text size scale so our px sizes match Qt
+    if not hasattr(rl, "_orig_draw_text_ex"):
+      rl._orig_draw_text_ex = rl.draw_text_ex
+
+    def _draw_text_ex_scaled(font, text, position, font_size, spacing, tint):
+      return rl._orig_draw_text_ex(font, text, position, font_size * FONT_SCALE, spacing, tint)
+
+    rl.draw_text_ex = _draw_text_ex_scaled
+
   def _set_log_callback(self):
     ffi_libc = cffi.FFI()
     ffi_libc.cdef("""

system/ui/lib/text_measure.py

@@ -1,4 +1,5 @@
 import pyray as rl
+from openpilot.system.ui.lib.application import FONT_SCALE
 
 _cache: dict[int, rl.Vector2] = {}
 
@@ -9,6 +10,6 @@ def measure_text_cached(font: rl.Font, text: str, font_size: int, spacing: int =
   if key in _cache:
     return _cache[key]
 
-  result = rl.measure_text_ex(font, text, font_size, spacing)  # noqa: TID251
+  result = rl.measure_text_ex(font, text, font_size * FONT_SCALE, spacing)  # noqa: TID251
   _cache[key] = result
   return result

system/ui/widgets/html_render.py

@@ -3,7 +3,7 @@
 from dataclasses import dataclass
 from enum import Enum
 from typing import Any
-from openpilot.system.ui.lib.application import gui_app, FontWeight
+from openpilot.system.ui.lib.application import gui_app, FontWeight, FONT_SCALE
 from openpilot.system.ui.lib.scroll_panel import GuiScrollPanel
 from openpilot.system.ui.lib.wrap_text import wrap_text
 from openpilot.system.ui.widgets import Widget
@@ -176,8 +176,8 @@ def _render(self, rect: rl.Rectangle):
         wrapped_lines = wrap_text(font, element.content, element.font_size, int(content_width))
 
         for line in wrapped_lines:
-          if current_y < rect.y - element.font_size:
-            current_y += element.font_size * element.line_height
+          if current_y < rect.y - element.font_size * FONT_SCALE:
+            current_y += element.font_size * FONT_SCALE * element.line_height
             continue
 
           if current_y > rect.y + rect.height:
@@ -186,7 +186,7 @@ def _render(self, rect: rl.Rectangle):
           text_x = rect.x + (max(element.indent_level - 1, 0) * LIST_INDENT_PX)
           rl.draw_text_ex(font, line, rl.Vector2(text_x + padding, current_y), element.font_size, 0, self._text_color)
 
-          current_y += element.font_size * element.line_height
+          current_y += element.font_size * FONT_SCALE * element.line_height
 
       # Apply bottom margin
       current_y += element.margin_bottom
@@ -210,7 +210,7 @@ def get_total_height(self, content_width: int) -> float:
         wrapped_lines = wrap_text(font, element.content, element.font_size, int(usable_width))
 
         for _ in wrapped_lines:
-          total_height += element.font_size * element.line_height
+          total_height += element.font_size * FONT_SCALE * element.line_height
 
       total_height += element.margin_bottom