added test+fix for transparency group stacking

[swftools.git] / spec / transpstack.py

diff --git a/spec/transpstack.py b/spec/transpstack.py
new file mode 100644 (file)
index 0000000..6bc151c
--- /dev/null
+++ b/spec/transpstack.py
@@ -0,0 +1,58 @@
+#!/usr/bin/python
+import sys
+sys.path += ["../scripts/"]
+import pdf
+
+# a test for transparency groups:
+# form xobjects used for doing transparency groups can do savestate (q)
+# without ever needing to do a corresponding restorestate (Q) because
+# their content stream is self-contained.
+#
+# Test that this doesn't confuse the pdf reader.
+    
+file = pdf.PDF()
+    
+page = file.add_page(612,100)
+
+group1 = file.create_object("/XObject", "/Form")
+group1.stream = """
+0.0 1.0 0.0 rg
+0.0 0.0 0.0 RG
+10 10 m 70 10 l 70 70 l 10 70 l 10 10 l f
+10 10 m 70 10 l 70 70 l 10 70 l 10 10 l s
+0.0 0.0 1.0 rg
+0.0 0.0 0.0 RG
+30 30 m 90 30 l 90 90 l 30 90 l 30 30 l f
+30 30 m 90 30 l 90 90 l 30 90 l 30 30 l s
+1.0 0 0 1.0 1000 1000 cm q
+1.0 0 0 1.0 1000 1000 cm q
+1.0 0 0 1.0 1000 1000 cm q
+1.0 0 0 1.0 1000 1000 cm q
+""" 
+isolated = "true"
+knockout = "true"
+group1["/Group"] = pdf.PDFDict({"/S": "/Transparency", "/CS": "/DeviceRGB", "/I": isolated, "/K": knockout})
+group1["/BBox"] = pdf.PDFArray([0, 0, 100, 100])
+
+gs = file.create_object("/ExtGState")
+gs["/BM"] = "/Normal"
+gs["/CA"] = "1.0" # stroke alpha
+gs["/ca"] = "1.0" # fill alpha
+
+resources = file.create_object("/Resources")
+resources["/XObject"] = pdf.PDFDict({"/mygroup": group1})
+resources["/ExtGState"] = pdf.PDFDict({"/gs0": gs})
+
+page.header["/Resources"] = resources
+
+page.stream = """q
+
+1.0 0.0 0.0 rg
+
+0 40 m 612 40 l 612 60 l 0 60 l 0 40 l f
+q /gs0 gs 1.0 0 0 1.0 0   0 cm /mygroup Do Q
+
+Q"""
+
+file.write("transpstack.pdf")
+