[Pcb_Print] RSVG 2.54 seems to solve scale issues

- So now we adjust the scale according to the resulting size,
  instead of assuming RSVG will do it always wrong.

kibot/create_pdf.py

@@ -6,9 +6,12 @@
 # Project: KiBot (formerly KiPlot)
 # Base idea: https://gitlab.com/dennevi/Board2Pdf/ (Released as Public Domain)
 from . import PyPDF2
+from . import log
+
+logger = log.get_logger()
 
 
-def create_pdf_from_pages(input_files, output_fn, scale=1.0):
+def create_pdf_from_pages(input_files, output_fn, forced_width=None):
     output = PyPDF2.PdfFileWriter()
     # Collect all pages
     open_files = []
@@ -17,7 +20,10 @@ def create_pdf_from_pages(input_files, output_fn, scale=1.0):
         open_files.append(file)
         pdf_reader = PyPDF2.PdfFileReader(file)
         page_obj = pdf_reader.getPage(0)
-        if scale != 1.0:
+        if forced_width is not None:
+            width = page_obj.mediaBox.getWidth()*25.4/72
+            scale = forced_width/width
+            logger.debugl(1, 'PDF scale {} ({} -> {})'.format(scale, width, forced_width))
             page_obj.scaleBy(scale)
         page_obj.compressContentStreams()
         output.addPage(page_obj)

kibot/out_pcb_print.py

@@ -867,6 +867,7 @@ class PCB_PrintOptions(VariantOptions):
     def svg_to_pdf(self, input_folder, svg_file, pdf_file):
         # Note: rsvg-convert uses 90 dpi but KiCad (and the docs I found) says SVG pt is 72 dpi
         # We use a 5x scale and then reduce it to maintain the page size
+        # Note: rsvg 2.50.3 has this problem 2.54.5 doesn't, so we ensure the size is correct, not a fixed scale
         dpi = str(self.dpi)
         cmd = [self.rsvg_command, '-d', dpi, '-p', dpi, '-f', 'pdf', '-o', os.path.join(input_folder, pdf_file),
                os.path.join(input_folder, svg_file)]
@@ -917,8 +918,8 @@ class PCB_PrintOptions(VariantOptions):
             logger.debug('- Creating {} from {}'.format(pdf_file, svg_file))
             self.svg_to_pdf(input_folder, svg_file, pdf_file)
             svg_files.append(os.path.join(input_folder, pdf_file))
-        logger.debug('- Joining {} into {}'.format(svg_files, output_fn))
-        create_pdf_from_pages(svg_files, output_fn, scale=72.0/self.dpi)
+        logger.debug('- Joining {} into {} ({}x{})'.format(svg_files, output_fn, self.paper_w, self.paper_h))
+        create_pdf_from_pages(svg_files, output_fn, forced_width=self.paper_w)
 
     def check_tools(self):
         if self.format != 'SVG':