pdfviewer: debug the parameters for snc, and for resolveReference

experimental/PdfViewer/SkPdfRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkForceLinking.h"
@@ skipping 1437 matching lines @@
 
 static PdfResult PdfOp_SC(PdfContext* pdfContext, SkCanvas* canvas, PdfTokenLooper** looper) {
     return PdfOp_SC_sc(pdfContext, canvas, &pdfContext->fGraphicsState.fStroking);
 }
 
 static PdfResult PdfOp_sc(PdfContext* pdfContext, SkCanvas* canvas, PdfTokenLooper** looper) {
     return PdfOp_SC_sc(pdfContext, canvas, &pdfContext->fGraphicsState.fNonStroking);
 }
 
 static PdfResult PdfOp_SCN_scn(PdfContext* pdfContext, SkCanvas* canvas, SkPdfColorOperator* colorOperator) {
-    //SkPdfString* name;
     if (pdfContext->fObjectStack.top()->isName()) {
-        // TODO(edisonn): get name, pass it
-        pdfContext->fObjectStack.pop();
+        SkPdfObject* name = pdfContext->fObjectStack.top();    pdfContext->fObjectStack.pop();
+
+        //Next, get the ExtGState Dictionary from the Resource Dictionary:
+        SkPdfDictionary* extGStateDictionary = pdfContext->fGraphicsState.fResources->Pattern(pdfContext->fPdfDoc);
+
+        if (extGStateDictionary == NULL) {
+#ifdef PDF_TRACE
+            printf("ExtGState is NULL!\n");
+#endif
+            return kIgnoreError_PdfResult;
+        }
+
+        /*SkPdfObject* value = */pdfContext->fPdfDoc->resolveReference(extGStateDictionary->get(name));
     }
 
     // TODO(edisonn): SCN supports more color spaces than SCN. Read and implement spec.
     PdfOp_SC_sc(pdfContext, canvas, colorOperator);
 
     return kPartial_PdfResult;
 }
 
 static PdfResult PdfOp_SCN(PdfContext* pdfContext, SkCanvas* canvas, PdfTokenLooper** looper) {
     return PdfOp_SCN_scn(pdfContext, canvas, &pdfContext->fGraphicsState.fStroking);
@@ skipping 971 matching lines @@
 
     rect = SkRect::MakeWH(width, height);
 
     setup_bitmap(output, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height));
 
     SkAutoTUnref<SkDevice> device(SkNEW_ARGS(SkDevice, (*output)));
     SkCanvas canvas(device);
 
     return renderer.renderPage(page, &canvas, rect);
 }