add png=>bmp in excel

src/docs/as_xls/render_to_xls.py

@@ -5,6 +5,9 @@ import math
 from io import BytesIO
 import xlrd
 import xlwt
+import os.path
+
+from PIL import Image
 
 from django.conf import settings
 from django.template import Template, RequestContext
@@ -48,7 +51,6 @@ def render_xls_to_string(request, xls_template, dictionary=None):
         # настройки
         xls_settings = get_settings(src_book)
         apply_page_settings(dst_sheet, xls_settings)
-        # import ipdb;ipdb.set_trace()
         # заполнить данными
         fill_xls(request, dictionary, src_sheet, dst_sheet, style_list, xls_settings)
 
@@ -88,6 +90,19 @@ def fill_xls(request, dictionary, src_sheet, dst_sheet, style_list, xls_settings
         context.update(kwargs)
         return template.render(context)
 
+    def set_new_value(file):
+        filename, file_extension = os.path.splitext(file)
+        if file_extension == '.png':
+            if os.path.isfile(f'{filename}.bmp'):
+                return f'{filename}.bmp'
+            else:
+                img = Image.open(file)
+                background = Image.new("RGB", img.size, (255, 255, 255))
+                background.paste(img, mask=img.split()[3])  # 3 is the alpha channel
+
+                background.save(f'{filename}.bmp')
+                return f'{filename}.bmp'
+
     def parse_cells(row_from=0, row_to=None, col_from=0, col_to=None,
                     dst_row_shift=0, dst_col_shift=0, **kwargs):
         """
@@ -159,6 +174,8 @@ def fill_xls(request, dictionary, src_sheet, dst_sheet, style_list, xls_settings
                 if new_value != cell_value:
                     if cmd_show_bmp and new_value:
                         try:
+                            new_value = set_new_value(new_value)
+
                             dst_sheet.insert_bitmap(
                                 new_value,
                                 row=row + dst_row_shift,