SkPdf: smaller color serialization
SkPDFUtils now has a special function (SkPDFUtils::AppendColorComponent)
just for writing out (color/255) as a decimal with three digits of
precision.
SkPDFUnion now has a type to represent a color component. It holds a
utint_8, but calls into AppendColorComponent to serialize.
Added a unit test that tests all possible input values.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2151863003
Review-Url: https://codereview.chromium.org/2151863003
diff --git a/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index 9e2a89e..d816b60 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -491,3 +491,16 @@
check_pdf_scalar_serialization(reporter, inputFloat);
}
}
+
+// Test SkPDFUtils:: for accuracy.
+DEF_TEST(PDFPrimitives_Color, reporter) {
+ char buffer[5];
+ for (int i = 0; i < 256; ++i) {
+ size_t len = SkPDFUtils::ColorToDecimal(i, buffer);
+ REPORTER_ASSERT(reporter, len == strlen(buffer));
+ float f;
+ REPORTER_ASSERT(reporter, 1 == sscanf(buffer, "%f", &f));
+ int roundTrip = (int)(0.5 + f * 255);
+ REPORTER_ASSERT(reporter, roundTrip == i);
+ }
+}