Add a pixel test with a free-form Gouraud-shaded triangle mesh. Show how it does not render correctly. i.e. The expected result shows the current behavior, not the desired behavior. Bug: pdfium:1546 Change-Id: I6591c25bc515353bea6d2a3f582079e150da6ec7 Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/70911 Reviewed-by: Daniel Hosseinian <dhoss@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>

diff --git a/testing/resources/pixel/bug_1546.in b/testing/resources/pixel/bug_1546.in
new file mode 100644
index 0000000..fb423d0
--- /dev/null
+++ b/testing/resources/pixel/bug_1546.in

@@ -0,0 +1,77 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [3 0 R]
+>>
+endobj
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Shading <<
+      /S0 5 0 R
+    >>
+  >>
+  /Contents 4 0 R
+  /MediaBox [0 0 200 300]
+>>
+endobj
+{{object 4 0}} <<
+  {streamlen}}
+>>
+stream
+/S0 sh
+endstream
+endobj
+{{object 5 0}} <<
+  /ShadingType 4
+  /BitsPerComponent 8
+  /BitsPerCoordinate 16
+  /BitsPerFlag 8
+  /ColorSpace /DeviceRGB
+  /Decode [-32768 32767 -32768 32767 0 1]
+  /Filter /ASCIIHexDecode
+  /Function 6 0 R
+  {{streamlen}}
+>>
+stream
+00800a800a0000800a80c8ff00806480c800
+endstream
+endobj
+{{object 6 0}} <<
+  /FunctionType 3
+  /Bounds [0.5]
+  /Domain [0 1]
+  /Encode [0 1 0 1]
+  /Functions [7 0 R 8 0 R]
+  /Range [0 1 0 1 0 1]
+>>
+endobj
+{{object 7 0}} <<
+  /FunctionType 2
+  /C0 [1 0 0]
+  /C1 [0 1 0]
+  /Domain [0 1]
+  /N 1
+  /Range [0 1 0 1 0 1]
+>>
+endobj
+{{object 8 0}} <<
+  /FunctionType 2
+  /C0 [0 1 0]
+  /C1 [0 0 1]
+  /Domain [0 1]
+  /N 1
+  /Range [0 1 0 1 0 1]
+>>
+endobj
+{{xref}}
+{{trailer}}
+{{startxref}}
+%%EOF

diff --git a/testing/resources/pixel/bug_1546_expected.pdf.0.png b/testing/resources/pixel/bug_1546_expected.pdf.0.png
new file mode 100644
index 0000000..e993bf1
--- /dev/null
+++ b/testing/resources/pixel/bug_1546_expected.pdf.0.png
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