pdfviewer: (in progress, uploaded for backup): transparency groups - isolated and knockout flags

experimental/PdfViewer/SkPdfBasics.cpp

 #include "SkPdfBasics.h"
 #include "SkPdfNativeTokenizer.h"
 
 #include "SkDashPathEffect.h"
 
 PdfContext::PdfContext(SkNativeParsedPDF* doc)
     : fPdfDoc(doc)
     , fTmpPageAllocator(new SkPdfAllocator()) {
 }
 
@@ skipping 10 matching lines @@
 
     // TODO(edisonn): get this from pdfContext->options,
     // or pdfContext->addPaintOptions(&paint);
     paint->setAntiAlias(true);
 
     // TODO(edisonn): miter, ...
     if (stroking) {
         paint->setStrokeWidth(SkDoubleToScalar(fLineWidth));
         // TODO(edisonn): perf, two sets of allocs, create SkDashPathEffect constr that takes ownership
         // of the intervals
-        if (fDashArrayLength > 0 && fDashPhase > 0) {
+        if (fDashArrayLength > 0) {
             paint->setPathEffect(new SkDashPathEffect(fDashArray, fDashArrayLength, fDashPhase))->unref();
         }
     }
+
+    // TODO(edisonn): NYI multiple blend modes
+    if (fBlendModesLength == 1 && fBlendModes[0] != SkXfermode::kSrc_Mode) {
+        paint->setXfermodeMode(fBlendModes[0]);
+    }
 }