Restructuring of PdfViewer code.

experimental/PdfViewer/src/SkPdfContext.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 "SkPdfContext.h"
-#include "SkPdfNativeTokenizer.h"
+#include "SkPdfNativeDoc.h"
+#include "SkPdfReporter.h"
+#include "SkPdfTokenLooper.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+class PdfMainLooper : public SkPdfTokenLooper {
+public:
+    PdfMainLooper(SkPdfTokenLooper* parent,
+                  SkPdfNativeTokenizer* tokenizer,
+                  SkPdfContext* pdfContext,
+                  SkCanvas* canvas)
+        : SkPdfTokenLooper(parent, tokenizer, pdfContext, canvas) {}
+
+    virtual SkPdfResult consumeToken(PdfToken& token);
+    virtual void loop();
+};
+
+///////////////////////////////////////////////////////////////////////////////
 
 SkPdfContext::SkPdfContext(SkPdfNativeDoc* doc)
     : fPdfDoc(doc)
-    , fTmpPageAllocator(new SkPdfAllocator()) {
+{
+    SkASSERT(fPdfDoc != NULL);
 }
 
-SkPdfContext::~SkPdfContext() {
-    delete fTmpPageAllocator;
+void SkPdfContext::parseStream(SkPdfNativeObject* stream, SkCanvas* canvas) {
+    SkPdfNativeTokenizer* tokenizer = fPdfDoc->tokenizerOfStream(stream, &fTmpPageAllocator);
+    if (NULL == tokenizer) {
+        // Nothing to parse.
+        return;
+    }
+    PdfMainLooper looper(NULL, tokenizer, this, canvas);
+    looper.loop();
+    // FIXME: SkDELETE, once tokenizerOfStream uses SkNEW.

[mtklein, 2013/11/22 14:40:20]

Or really, SkAutoTDelete for the whole thing?

[scroggo, 2013/11/22 15:03:00]

In a future CL, I put the object on the stack (could be changed here, but trying
to mostly change location and not behavior in this CL).

+    delete tokenizer;
 }
+
+///////////////////////////////////////////////////////////////////////////////
+
+// FIXME (scroggo): This probably belongs in a debugging file.
+// For reportRenderStats declaration.
+#include "SkPdfRenderer.h"
+
+// Temp code to measure what operands fail.
+template <typename T> class SkTDictWithDefaultConstructor : public SkTDict<T> {
+public:
+    SkTDictWithDefaultConstructor() : SkTDict<T>(10) {}
+};
+
+SkTDictWithDefaultConstructor<int> gRenderStats[kCount_SkPdfResult];
+
+const char* gRenderStatsNames[kCount_SkPdfResult] = {
+    "Success",
+    "Partially implemented",
+    "Not yet implemented",
+    "Ignore Error",
+    "Error",
+    "Unsupported/Unknown"
+};
+
+void reportPdfRenderStats() {

[mtklein, 2013/11/22 14:40:20]

can we make this guy static and report_pdf_render_stats?

[scroggo, 2013/11/22 15:03:00]

It cannot be static, since we need to access it from pdf_viewer_main. I'll
probably want to move it into a class or something though.

+    for (int i = 0 ; i < kCount_SkPdfResult; i++) {
+        SkTDict<int>::Iter iter(gRenderStats[i]);
+        const char* key;
+        int value = 0;
+        while ((key = iter.next(&value)) != NULL) {
+            printf("%s: %s -> count %i\n", gRenderStatsNames[i], key, value);
+        }
+    }
+}
+
+#include "SkPdfOps.h"
+
+SkPdfResult PdfMainLooper::consumeToken(PdfToken& token) {
+    if (token.fType == kKeyword_TokenType && token.fKeywordLength < 256)
+    {
+        PdfOperatorRenderer pdfOperatorRenderer = NULL;
+        if (gPdfOps.find(token.fKeyword, token.fKeywordLength, &pdfOperatorRenderer) &&
+                    pdfOperatorRenderer) {
+            SkPdfTokenLooper* childLooper = NULL;
+            // Main work is done by pdfOperatorRenderer(...)
+            SkPdfResult result = pdfOperatorRenderer(fPdfContext, fCanvas, &childLooper);
+
+            int cnt = 0;
+            gRenderStats[result].find(token.fKeyword, token.fKeywordLength, &cnt);
+            gRenderStats[result].set(token.fKeyword, token.fKeywordLength, cnt + 1);
+            if (childLooper) {
+                childLooper->setUp(this);
+                childLooper->loop();
+                delete childLooper;

[mtklein, 2013/11/22 14:40:20]

It'd be nice if we could get this to be an SkAutoTDelete too.  I think we'd have
to invade pdfOperatorRenderer a little to make that work.

[scroggo, 2013/11/22 15:03:00]

Agreed. I added a fixme, so I can leave the code a straight copy.

+            }
+        } else {
+            int cnt = 0;
+            gRenderStats[kUnsupported_SkPdfResult].find(token.fKeyword,
+                                                        token.fKeywordLength,
+                                                        &cnt);
+            gRenderStats[kUnsupported_SkPdfResult].set(token.fKeyword,
+                                                       token.fKeywordLength,
+                                                       cnt + 1);
+        }
+    }
+    else if (token.fType == kObject_TokenType)
+    {
+        fPdfContext->fObjectStack.push( token.fObject );
+    }
+    else {
+        // TODO(edisonn): store the keyword as a object, so we can track the location in file,
+        //                and report where the error was triggered
+        SkPdfReport(kCodeWarning_SkPdfIssueSeverity, kNYI_SkPdfIssue, token.fKeyword, NULL,
+                    fPdfContext);
+        return kIgnoreError_SkPdfResult;
+    }
+    return kOK_SkPdfResult;
+}
+
+void PdfMainLooper::loop() {
+    PdfToken token;
+    // readToken defined in SkPdfTokenLooper.h
+    while (readToken(fTokenizer, &token)) {

[mtklein, 2013/11/22 14:40:20]

hmm, it wants to be named ReadToken then right?

It is confusing why this is not just this->readToken().  Maybe something to
distinguish it, like ReadTokenWithExtraDebugging()?

[scroggo, 2013/11/22 15:03:00]

The next patch (https://codereview.chromium.org/80463005/) removes readToken and
calls fTokenizer->readToken directly.

+        this->consumeToken(token);
+    }
+}