fix: rotate preview to be human-readable

labelmaker/main.py

@@ -38,6 +38,16 @@ class Renderer(object):
         with open(name, 'wb') as f:
             self.surface.write_to_png(f)
 
+    def get_preview(self):
+        new_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, self.width, self.height)
+        context = cairo.Context(new_surface)
+        context.translate(0, self.height)
+        # 360 no scope
+        context.rotate(-90.0*math.pi/180.0)
+        context.set_source_surface(self.surface, 0, 0)
+        context.paint()
+        return new_surface.write_to_png()
+
     def render_text(self, text, fontname, x, y, html=False):
         print("Fontname:", fontname)
         self.context.save()
@@ -76,7 +86,7 @@ def stuff_preview(size):
     renderer = Renderer()
     renderer.render_text(text, 'Sans {}'.format(size), 0, -1, html)
 
-    preview = renderer.surface.write_to_png()
+    preview = renderer.get_preview()
     return flask.Response(preview, mimetype='image/png')
 
 DELAY = 5