misc improvements

README.md

@@ -586,7 +586,8 @@ Nonetheless, the following guide may be helpful to get started with the raw API,
   height = math.ceil(pdfium_c.FPDF_GetPageHeightF(page))
   
   # Create a bitmap
-  use_alpha = False  # We don't render with transparent background
+  # (Note, pdfium is faster at rendering transparency if we use BGRA rather than BGRx)
+  use_alpha = pdfium_c.FPDFPage_HasTransparency(page)
   bitmap = pdfium_c.FPDFBitmap_Create(width, height, int(use_alpha))
   # Fill the whole bitmap with a white background
   # The color is given as a 32-bit integer in ARGB format (8 bits per channel)

setupsrc/pypdfium2_setup/packaging_base.py

@@ -434,9 +434,8 @@ def run_ctypesgen(target_dir, headers_dir, flags=[], guard_symbols=False, compil
     assert getattr(ctypesgen, "PYPDFIUM2_SPECIFIC", False), "pypdfium2 requires fork of ctypesgen"
     import ctypesgen.__main__
 
-    args = ["-l", "pdfium"]
-
     # library loading
+    args = ["-l", "pdfium"]
     if run_lds:
         args += ["--runtime-libdirs", *run_lds]
         if not allow_system_despite_libdirs: