pdfviewer: debug code for drawText (show magenta background for text, to show text even when we fai…

experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h

-#ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
-#define EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
-
-#include "SkRect.h"
-#include "SkTDArray.h"
-
-class SkCanvas;
-
-class SkPdfAllocator;
-class SkPdfMapper;
-class SkPdfObject;
-class SkPdfReal;
-class SkPdfInteger;
-class SkPdfString;
-class SkPdfResourceDictionary;
-class SkPdfCatalogDictionary;
-class SkPdfPageObjectDictionary;
-class SkPdfPageTreeNodeDictionary;
-
-class SkPdfNativeTokenizer;
-
-class SkStream;
-
-class SkNativeParsedPDF {
-private:
-    struct PublicObjectEntry {
-        long fOffset;
-        // long endOffset;  // TODO(edisonn): determine the end of the object, to be used when the doc is corrupted
-        SkPdfObject* fObj;
-        // TODO(edisonn): perf ... probably it does not make sense to cache the ref. test it!
-        SkPdfObject* fResolvedReference;
-    };
-
-public:
-    // TODO(edisonn): read methods: file, stream, http(s)://url, url with seek?
-    // TODO(edisonn): read first page asap, linearized
-    // TODO(edisonn): read page N asap, read all file
-    // TODO(edisonn): allow corruptions of file (e.g. missing endobj, missing stream length, ...)
-    // TODO(edisonn): encryption
-
-    SkNativeParsedPDF(const char* path);
-    SkNativeParsedPDF(SkStream* stream);
-
-    ~SkNativeParsedPDF();
-
-    int pages() const;
-    SkPdfResourceDictionary* pageResources(int page);
-    SkRect MediaBox(int page);
-    SkPdfNativeTokenizer* tokenizerOfPage(int n, SkPdfAllocator* allocator);
-
-    SkPdfNativeTokenizer* tokenizerOfStream(SkPdfObject* stream, SkPdfAllocator* allocator);
-    SkPdfNativeTokenizer* tokenizerOfBuffer(const unsigned char* buffer, size_t len,
-                                            SkPdfAllocator* allocator);
-
-    size_t objects() const;
-    SkPdfObject* object(int i);
-    SkPdfPageObjectDictionary* page(int page);
-
-    const SkPdfMapper* mapper() const;
-    SkPdfAllocator* allocator() const;
-
-    SkPdfReal* createReal(double value) const;
-    SkPdfInteger* createInteger(int value) const;
-    // the string does not own the char*
-    SkPdfString* createString(const unsigned char* sz, size_t len) const;
-
-    SkPdfObject* resolveReference(SkPdfObject* ref);
-
-    // Reports an approximation of all the memory usage.
-    size_t bytesUsed() const;
-
-private:
-
-    // Takes ownership of bytes.
-    void init(const void* bytes, size_t length);
-    void loadWithoutXRef();
-
-    const unsigned char* readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd);
-    const unsigned char* readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword);
-
-    // TODO(edisonn): updates not supported right now, generation ignored
-    void addCrossSectionInfo(int id, int generation, int offset, bool isFreed);
-    static void reset(PublicObjectEntry* obj) {
-        obj->fObj = NULL;
-        obj->fResolvedReference = NULL;
-        obj->fOffset = -1;
-    }
-
-    SkPdfObject* readObject(int id/*, int generation*/);
-
-    void fillPages(SkPdfPageTreeNodeDictionary* tree);
-
-    // private fields
-    SkPdfAllocator* fAllocator;
-    SkPdfMapper* fMapper;
-    const unsigned char* fFileContent;
-    size_t fContentLength;
-    SkPdfObject* fRootCatalogRef;
-    SkPdfCatalogDictionary* fRootCatalog;
-
-    mutable SkTDArray<PublicObjectEntry> fObjects;
-    SkTDArray<SkPdfPageObjectDictionary*> fPages;
-};
-
-#endif  // EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_