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-rw-r--r--constants/transparency.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/constants/transparency.h b/constants/transparency.h
index 6ae79c949d..22a89c33c4 100644
--- a/constants/transparency.h
+++ b/constants/transparency.h
@@ -32,6 +32,22 @@ constexpr char kSaturation[] = "Saturation";
constexpr char kColor[] = "Color";
constexpr char kLuminosity[] = "Luminosity";
+// PDF 1.7 spec, table 7.10.
+// Entries in a soft-mask dictionary.
+
+constexpr char kSoftMaskSubType[] = "S";
+constexpr char kAlpha[] = "Alpha";
+constexpr char kG[] = "G";
+constexpr char kBC[] = "BC";
+constexpr char kTR[] = "TR";
+
+// PDF 1.7 spec, table 7.13.
+// Additional entries specific to a transparency group attributes dictionary.
+
+constexpr char kGroupSubType[] = "S";
+constexpr char kTransparency[] = "Transparency";
+constexpr char kI[] = "I";
+
} // namespace transparency
} // namespace pdfium