Add text rendering with auto-fit support

text() renders text into a rectangle with alignment (left/center/right).
Pass size=0 to auto-size the text to fill the rectangle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

spork.py

@@ -1,6 +1,6 @@
 from reportlab.lib.units import inch
 from reportlab.pdfgen import canvas
-from PIL import Image, ImageDraw
+from PIL import Image, ImageDraw, ImageFont
 import os
 import tempfile
 
@@ -95,6 +95,32 @@ def ReadJPG(filepath):
 
 DPI = 300
 
+# Alignment
+LEFT = "left"
+CENTER = "center"
+RIGHT = "right"
+
+
+def _render_text(page, text, font_path, size_pt, x, y, w, h, align, color):
+    size_px = int(size_pt * DPI / 72)
+    font = ImageFont.truetype(font_path, size_px)
+    draw = ImageDraw.Draw(page)
+    bbox = draw.textbbox((0, 0), text, font=font)
+    tw = bbox[2] - bbox[0]
+    th = bbox[3] - bbox[1]
+    xp = int(x * DPI)
+    yp = int(y * DPI)
+    wp = int(w * DPI)
+    hp = int(h * DPI)
+    if align == CENTER:
+        tx = xp + (wp - tw) // 2
+    elif align == RIGHT:
+        tx = xp + wp - tw
+    else:
+        tx = xp
+    ty = yp + (hp - th) // 2
+    draw.text((tx, ty - bbox[1]), text, font=font, fill=color + (255,))
+
 
 class NewPDF:
     def __init__(self, width_inches, height_inches):
@@ -116,6 +142,9 @@ class NewPDF:
     def line(self, color, x0, y0, x1, y1, width=1):
         self._ops.append(("line", color, x0, y0, x1, y1, width))
 
+    def text(self, string, font, size, x, y, w, h, align=LEFT, color=BLACK):
+        self._ops.append(("text", string, font, size, x, y, w, h, align, color))
+
     def save(self, filename):
         pw = int(self.width_inches * DPI)
         ph = int(self.height_inches * DPI)
@@ -152,6 +181,26 @@ class NewPDF:
                     fill=color + (255,), width=width,
                 )
 
+            elif op[0] == "text":
+                _, string, font, size, x, y, w, h, align, color = op
+                if size == 0:
+                    wp = int(w * DPI)
+                    hp = int(h * DPI)
+                    lo, hi = 1, 1000
+                    while lo < hi:
+                        mid = (lo + hi + 1) // 2
+                        size_px = int(mid * DPI / 72)
+                        f = ImageFont.truetype(font, size_px)
+                        bbox = ImageDraw.Draw(page).textbbox((0, 0), string, font=f)
+                        tw = bbox[2] - bbox[0]
+                        th = bbox[3] - bbox[1]
+                        if tw <= wp and th <= hp:
+                            lo = mid
+                        else:
+                            hi = mid - 1
+                    size = lo
+                _render_text(page, string, font, size, x, y, w, h, align, color)
+
         # Write composited image to PDF
         rgb_page = page.convert("RGB")
         c = canvas.Canvas(filename, pagesize=(self.width, self.height))