[PDF] Fix font embedding restrictions.

src/pdf/SkPDFFont.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <ctype.h>
 
 #include "SkData.h"
@@ skipping 743 matching lines @@
 }
 
 SkTypeface* SkPDFFont::typeface() {
     return fTypeface.get();
 }
 
 SkAdvancedTypefaceMetrics::FontType SkPDFFont::getType() {
     return fFontType;
 }
 
+bool SkPDFFont::canEmbed() const {
+    if (!fFontInfo.get()) {
+        SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font);
+        return true;
+    }
+    return (fFontInfo->fFlags &
+            SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag) == 0;
+}
+
+bool SkPDFFont::canSubset() const {
+    if (!fFontInfo.get()) {
+        SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font);
+        return true;
+    }
+    return (fFontInfo->fFlags &
+            SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag) == 0;
+}
+
 bool SkPDFFont::hasGlyph(uint16_t id) {
     return (id >= fFirstGlyphID && id <= fLastGlyphID) || id == 0;
 }
 
 int SkPDFFont::glyphsToPDFFontEncoding(uint16_t* glyphIDs, int numGlyphs) {
     // A font with multibyte glyphs will support all glyph IDs in a single font.
     if (this->multiByteGlyphs()) {
         return numGlyphs;
     }
 
@@ skipping 27 matching lines @@
     SkAutoTUnref<SkAdvancedTypefaceMetrics> fontMetrics;
     SkPDFDict* relatedFontDescriptor = NULL;
     if (relatedFontIndex >= 0) {
         SkPDFFont* relatedFont = CanonicalFonts()[relatedFontIndex].fFont;
         fontMetrics.reset(relatedFont->fontInfo());
         SkSafeRef(fontMetrics.get());
         relatedFontDescriptor = relatedFont->getFontDescriptor();
 
         // This only is to catch callers who pass invalid glyph ids.
         // If glyph id is invalid, then we will create duplicate entries
-        // for True Type fonts.
+        // for TrueType fonts.
         SkAdvancedTypefaceMetrics::FontType fontType =
             fontMetrics.get() ? fontMetrics.get()->fType :
                                 SkAdvancedTypefaceMetrics::kOther_Font;
 
         if (fontType == SkAdvancedTypefaceMetrics::kType1CID_Font ||
             fontType == SkAdvancedTypefaceMetrics::kTrueType_Font) {
             CanonicalFonts()[relatedFontIndex].fFont->ref();
             return CanonicalFonts()[relatedFontIndex].fFont;
         }
     } else {
@@ skipping 59 matching lines @@
 }
 
 SkPDFFont::SkPDFFont(SkAdvancedTypefaceMetrics* info, SkTypeface* typeface,
                      SkPDFDict* relatedFontDescriptor)
         : SkPDFDict("Font"),
           fTypeface(ref_or_default(typeface)),
           fFirstGlyphID(1),
           fLastGlyphID(info ? info->fLastGlyphID : 0),
           fFontInfo(SkSafeRef(info)),
           fDescriptor(SkSafeRef(relatedFontDescriptor)) {
-    if (info == NULL) {
-        fFontType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
-    } else if (info->fMultiMaster) {
+    if (info == NULL ||
+            info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag) {
         fFontType = SkAdvancedTypefaceMetrics::kOther_Font;
     } else {
         fFontType = info->fType;
     }
 }
 
 // static
 SkPDFFont* SkPDFFont::Create(SkAdvancedTypefaceMetrics* info,
                              SkTypeface* typeface, uint16_t glyphID,
                              SkPDFDict* relatedFontDescriptor) {
     SkAdvancedTypefaceMetrics::FontType type =
-        info ? info->fType : SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
+        info ? info->fType : SkAdvancedTypefaceMetrics::kOther_Font;
 
-    if (info && info->fMultiMaster) {
+    if (info &&
+            (info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag)) {
         NOT_IMPLEMENTED(true, true);
         return new SkPDFType3Font(info,
                                   typeface,
                                   glyphID);
     }
     if (type == SkAdvancedTypefaceMetrics::kType1CID_Font ||
         type == SkAdvancedTypefaceMetrics::kTrueType_Font) {
         SkASSERT(relatedFontDescriptor == NULL);
         return new SkPDFType0Font(info, typeface);
     }
     if (type == SkAdvancedTypefaceMetrics::kType1_Font) {
         return new SkPDFType1Font(info,
                                   typeface,
                                   glyphID,
                                   relatedFontDescriptor);
     }
 
     SkASSERT(type == SkAdvancedTypefaceMetrics::kCFF_Font ||
-             type == SkAdvancedTypefaceMetrics::kOther_Font ||
-             type == SkAdvancedTypefaceMetrics::kNotEmbeddable_Font);
+             type == SkAdvancedTypefaceMetrics::kOther_Font);
 
     return new SkPDFType3Font(info, typeface, glyphID);
 }
 
 SkAdvancedTypefaceMetrics* SkPDFFont::fontInfo() {
     return fFontInfo.get();
 }
 
 void SkPDFFont::setFontInfo(SkAdvancedTypefaceMetrics* info) {
     if (info == NULL || info == fFontInfo.get()) {
@@ skipping 107 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // class SkPDFType0Font
 ///////////////////////////////////////////////////////////////////////////////
 
 SkPDFType0Font::SkPDFType0Font(SkAdvancedTypefaceMetrics* info,
                                SkTypeface* typeface)
         : SkPDFFont(info, typeface, NULL) {
     SkDEBUGCODE(fPopulated = false);
+    if (!canSubset()) {
+        populate(NULL);
+    }
 }
 
 SkPDFType0Font::~SkPDFType0Font() {}
 
 SkPDFFont* SkPDFType0Font::getFontSubset(const SkPDFGlyphSet* subset) {
+    if (!canSubset()) {
+        return NULL;
+    }
     SkPDFType0Font* newSubset = new SkPDFType0Font(fontInfo(), typeface());
     newSubset->populate(subset);
     return newSubset;
 }
 
 #ifdef SK_DEBUG
 void SkPDFType0Font::emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                                 bool indirect) {
     SkASSERT(fPopulated);
     return INHERITED::emitObject(stream, catalog, indirect);
@@ skipping 28 matching lines @@
     populate(subset);
 }
 
 SkPDFCIDFont::~SkPDFCIDFont() {}
 
 bool SkPDFCIDFont::addFontDescriptor(int16_t defaultWidth,
                                      const SkTDArray<uint32_t>* subset) {
     SkAutoTUnref<SkPDFDict> descriptor(new SkPDFDict("FontDescriptor"));
     setFontDescriptor(descriptor.get());
     addResource(descriptor.get());
+    insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
+    if (!addCommonFontDescriptorEntries(defaultWidth)) {
+        return false;
+    }
+    if (!canEmbed()) {
+        return true;
+    }
 
     switch (getType()) {
         case SkAdvancedTypefaceMetrics::kTrueType_Font: {
-            SkASSERT(subset);
-            // Font subsetting
-            SkPDFStream* rawStream = NULL;
-            size_t fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(),
-                                                     typeface(),
-                                                     *subset,
-                                                     &rawStream);
+            SkAutoTUnref<SkPDFStream> fontStream;
+            size_t fontSize = 0;
+            if (canSubset()) {
+                SkPDFStream* rawStream = NULL;
+                fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(),
+                                                  typeface(),
+                                                  *subset,
+                                                  &rawStream);
+                fontStream.reset(rawStream);
+            } else {
+                int ttcIndex;
+                SkAutoTUnref<SkStream> fontData(
+                        typeface()->openStream(&ttcIndex));
+                fontStream.reset(new SkPDFStream(fontData.get()));
+                fontSize = fontData->getLength();
+            }
             SkASSERT(fontSize);
-            SkASSERT(rawStream);
-            SkAutoTUnref<SkPDFStream> fontStream(rawStream);
+            SkASSERT(fontStream.get());
             addResource(fontStream.get());
 
             fontStream->insertInt("Length1", fontSize);
             descriptor->insert("FontFile2",
                                new SkPDFObjRef(fontStream.get()))->unref();
             break;
         }
         case SkAdvancedTypefaceMetrics::kCFF_Font:
         case SkAdvancedTypefaceMetrics::kType1CID_Font: {
             int ttcIndex;
             SkAutoTUnref<SkStream> fontData(typeface()->openStream(&ttcIndex));
             SkAutoTUnref<SkPDFStream> fontStream(
                 new SkPDFStream(fontData.get()));
             addResource(fontStream.get());
 
             if (getType() == SkAdvancedTypefaceMetrics::kCFF_Font) {
                 fontStream->insertName("Subtype", "Type1C");
             } else {
                 fontStream->insertName("Subtype", "CIDFontType0c");
             }
             descriptor->insert("FontFile3",
                                 new SkPDFObjRef(fontStream.get()))->unref();
             break;
         }
         default:
             SkASSERT(false);
     }
-
-    insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
-    return addCommonFontDescriptorEntries(defaultWidth);
+    return true;
 }
 
 bool SkPDFCIDFont::populate(const SkPDFGlyphSet* subset) {
     // Generate new font metrics with advance info for true type fonts.
     if (fontInfo()->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) {
         // Generate glyph id array.
         SkTDArray<uint32_t> glyphIDs;
         if (subset) {
             // Always include glyph 0.
             if (!subset->has(0)) {
@@ skipping 98 matching lines @@
     int ttcIndex;
     size_t header SK_INIT_TO_AVOID_WARNING;
     size_t data SK_INIT_TO_AVOID_WARNING;
     size_t trailer SK_INIT_TO_AVOID_WARNING;
     SkAutoTUnref<SkStream> rawFontData(typeface()->openStream(&ttcIndex));
     SkStream* fontData = handleType1Stream(rawFontData.get(), &header, &data,
                                            &trailer);
     if (fontData == NULL) {
         return false;
     }
-    SkAutoTUnref<SkPDFStream> fontStream(new SkPDFStream(fontData));
-    addResource(fontStream.get());
-    fontStream->insertInt("Length1", header);
-    fontStream->insertInt("Length2", data);
-    fontStream->insertInt("Length3", trailer);
-    descriptor->insert("FontFile", new SkPDFObjRef(fontStream.get()))->unref();
+    if (canEmbed()) {
+        SkAutoTUnref<SkPDFStream> fontStream(new SkPDFStream(fontData));
+        addResource(fontStream.get());
+        fontStream->insertInt("Length1", header);
+        fontStream->insertInt("Length2", data);
+        fontStream->insertInt("Length3", trailer);
+        descriptor->insert("FontFile",
+                           new SkPDFObjRef(fontStream.get()))->unref();
+    }
 
     addResource(descriptor.get());
     insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
 
     return addCommonFontDescriptorEntries(defaultWidth);
 }
 
 bool SkPDFType1Font::populate(int16_t glyphID) {
     SkASSERT(!fontInfo()->fVerticalMetrics.get());
     SkASSERT(fontInfo()->fGlyphWidths.get());
@@ skipping 151 matching lines @@
 
     insert("FontBBox", makeFontBBox(bbox, 1000))->unref();
     insertInt("FirstChar", 1);
     insertInt("LastChar", lastGlyphID() - firstGlyphID() + 1);
     insert("Widths", widthArray.get());
     insertName("CIDToGIDMap", "Identity");
 
     populateToUnicodeTable(NULL);
     return true;
 }