Add pixel tests for PDFs that use generation numbers.

This checks in 2 identical looking PDFs. They both started out as
hello_world.pdf. They were then hand edited in different ways that
results in the same final rendering output.

Change-Id: Ib3b634a5119c0f2e4beb36844c3f2b8d58ab8a21
Reviewed-on: https://pdfium-review.googlesource.com/33232
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

6 files changed, 280 insertions, 0 deletions

diff --git a/testing/resources/pixel/generation_numbers1.pdf b/testing/resources/pixel/generation_numbers1.pdf
new file mode 100644
index 0000000000..2f63f041b7
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers1.pdf
@@ -0,0 +1,133 @@
+%PDF-1.7
+% ò¤ô
+1 0 obj <<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+endobj
+2 0 obj <<
+  /Type /Pages
+  /MediaBox [ 0 0 200 200 ]
+  /Count 1
+  /Kids [ 3 0 R ]
+>>
+endobj
+3 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+      /F2 5 0 R
+    >>
+  >>
+  /Contents 6 0 R
+>>
+endobj
+4 0 obj <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Times-Roman
+>>
+endobj
+5 0 obj <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Helvetica
+>>
+endobj
+6 0 obj <<
+  /Length 83
+>>
+stream
+BT
+20 50 Td
+/F1 12 Tf
+(Hello, world!) Tj
+0 50 Td
+/F2 16 Tf
+(Goodbye, world!) Tj
+ET
+endstream
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000068 00000 n 
+0000000161 00000 n 
+0000000303 00000 n 
+0000000381 00000 n 
+0000000457 00000 n 
+trailer <<
+  /Root 1 0 R
+  /Size 7
+>>
+startxref
+591
+%%EOF
+3 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+>>
+endobj
+xref
+0 7
+0000000006 65535 f 
+0000000015 00000 n 
+0000000068 00000 n 
+0000000798 00000 n 
+0000000303 00000 n 
+0000000381 00000 n 
+0000000000 00001 f 
+trailer <<
+  /Root 1 0 R
+  /Size 7
+  /Prev 591
+>>
+startxref
+849
+%%EOF
+3 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+      /F2 5 0 R
+    >>
+  >>
+  /Contents 6 1 R
+>>
+endobj
+6 1 obj <<
+  /Length 83
+>>
+stream
+BT
+20 50 Td
+/F1 12 Tf
+(Goodbye, world!) Tj
+0 50 Td
+/F2 16 Tf
+(Hello, world!) Tj
+ET
+endstream
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000068 00000 n 
+0000001068 00000 n 
+0000000303 00000 n 
+0000000381 00000 n 
+0000001210 00001 n 
+trailer <<
+  /Root 1 0 R
+  /Size 7
+  /Prev 849
+>>
+startxref
+1344
+%%EOF
diff --git a/testing/resources/pixel/generation_numbers1_expected.pdf.0.png b/testing/resources/pixel/generation_numbers1_expected.pdf.0.png
new file mode 100644
index 0000000000..f2d3ba9038
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers1_expected.pdf.0.png
diff --git a/testing/resources/pixel/generation_numbers1_expected_mac.pdf.0.png b/testing/resources/pixel/generation_numbers1_expected_mac.pdf.0.png
new file mode 100644
index 0000000000..8d973acbd6
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers1_expected_mac.pdf.0.png
diff --git a/testing/resources/pixel/generation_numbers2.pdf b/testing/resources/pixel/generation_numbers2.pdf
new file mode 100644
index 0000000000..9ad64a8515
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers2.pdf
@@ -0,0 +1,147 @@
+%PDF-1.7
+% ò¤ô
+1 0 obj <<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+endobj
+2 0 obj <<
+  /Type /Pages
+  /MediaBox [ 0 0 200 200 ]
+  /Count 1
+  /Kids [ 3 0 R ]
+>>
+endobj
+3 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+      /F2 5 0 R
+    >>
+  >>
+  /Contents 6 0 R
+>>
+endobj
+4 0 obj <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Times-Roman
+>>
+endobj
+5 0 obj <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Helvetica
+>>
+endobj
+6 0 obj <<
+  /Length 83
+>>
+stream
+BT
+20 50 Td
+/F1 12 Tf
+(Hello, world!) Tj
+0 50 Td
+/F2 16 Tf
+(Goodbye, world!) Tj
+ET
+endstream
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000068 00000 n 
+0000000161 00000 n 
+0000000303 00000 n 
+0000000381 00000 n 
+0000000457 00000 n 
+trailer <<
+  /Root 1 0 R
+  /Size 7
+>>
+startxref
+591
+%%EOF
+2 0 obj <<
+  /Type /Pages
+  /MediaBox [ 0 0 200 200 ]
+  /Count 2
+  /Kids [ 7 0 R 7 0 R ]
+>>
+endobj
+7 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+>>
+endobj
+xref
+0 4
+0000000003 65535 f 
+0000000015 00000 n 
+0000000798 00000 n 
+0000000006 00001 f 
+6 2
+0000000000 00001 f 
+0000000897 00000 n 
+trailer <<
+  /Root 1 0 R
+  /Size 8
+  /Prev 591
+>>
+startxref
+948
+%%EOF
+2 0 obj <<
+  /Type /Pages
+  /MediaBox [ 0 0 200 200 ]
+  /Count 1
+  /Kids [ 3 1 R ]
+>>
+endobj
+3 1 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+      /F2 5 0 R
+    >>
+  >>
+  /Contents 6 1 R
+>>
+endobj
+6 1 obj <<
+  /Length 83
+>>
+stream
+BT
+20 50 Td
+/F1 12 Tf
+(Goodbye, world!) Tj
+0 50 Td
+/F2 16 Tf
+(Hello, world!) Tj
+ET
+endstream
+endobj
+xref
+0 4
+0000000007 65535 f 
+0000000015 00000 n 
+0000001151 00000 n 
+0000001244 00001 n 
+6 2
+0000001386 00001 n 
+0000000000 00001 f 
+trailer <<
+  /Root 1 0 R
+  /Size 8
+  /Prev 948
+>>
+startxref
+1520
+%%EOF
diff --git a/testing/resources/pixel/generation_numbers2_expected.pdf.0.png b/testing/resources/pixel/generation_numbers2_expected.pdf.0.png
new file mode 100644
index 0000000000..f2d3ba9038
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers2_expected.pdf.0.png
diff --git a/testing/resources/pixel/generation_numbers2_expected_mac.pdf.0.png b/testing/resources/pixel/generation_numbers2_expected_mac.pdf.0.png
new file mode 100644
index 0000000000..8d973acbd6
--- /dev/null
+++ b/testing/resources/pixel/generation_numbers2_expected_mac.pdf.0.png