Basic support for Type3 Fonts in Pdf + various refactorings
Review URL: https://codereview.chromium.org/17748002
git-svn-id: http://skia.googlecode.com/svn/trunk@9757 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/SkPdfFont.cpp b/experimental/PdfViewer/SkPdfFont.cpp
index 520c820..a4d70ab 100644
--- a/experimental/PdfViewer/SkPdfFont.cpp
+++ b/experimental/PdfViewer/SkPdfFont.cpp
@@ -70,6 +70,7 @@
// see FT_Get_Postscript_Name
// Font config is not using it, yet.
//https://bugs.freedesktop.org/show_bug.cgi?id=18095
+
gPdfStandardFonts["Arial-Black"] = {"Arial", true, false};
gPdfStandardFonts["DejaVuSans"] = {"DejaVu Sans", false, false};
gPdfStandardFonts["DejaVuSansMono"] = {"DejaVuSans Mono", false, false};
@@ -82,6 +83,34 @@
gPdfStandardFonts["TrebuchetMS-Bold"] = {"Trebuchet MS", true, false};
gPdfStandardFonts["Verdana-Bold"] = {"Verdana", true, false};
gPdfStandardFonts["WenQuanYiMicroHei"] = {"WenQuanYi Micro Hei", false, false};
+
+ // TODO(edisonn): list all phonts available, builf post script name as in pdf spec
+ /*
+ * The PostScript name for the value of BaseFontis determined in one of two ways:
+• Use the PostScript name that is an optional entry in the “name” table of the
+TrueType font itself.
+• In the absence of such an entry in the “name” table, derive a PostScript name
+from the name by which the font is known in the host operating system: on a
+Windows system, it is based on the lfFaceName field in a LOGFONT structure; in
+the Mac OS, it is based on the name of the FONDresource. If the name contains
+any spaces, the spaces are removed.
+If the font in a source document uses a bold or italic style, but there is no font
+data for that style, the host operating system will synthesize the style. In this case,
+a comma and the style name (one of Bold, Italic, or BoldItalic) are appended to the
+font name. For example, for a TrueType font that is a bold variant of the New
+ */
+
+ /*
+ * If the value of Subtype is MMType1.
+• If the PostScript name of the instance contains spaces, the spaces are replaced
+by underscores in the value of BaseFont. For instance, as illustrated in Example
+5.7, the name “MinionMM 366 465 11 ” (which ends with a space character)
+becomes /MinionMM_366_465_11_.
+ */
+
+ // might not work on all oses ?
+ //
+
}
return gPdfStandardFonts;
@@ -178,6 +207,8 @@
return NULL; // default one?
}
+
+
return new SkPdfType3Font(dict);
}
@@ -213,26 +244,11 @@
return ret;
}
-SkPdfType0Font::SkPdfType0Font(SkPdfType0FontDictionary* dict) {
- fBaseFont = SkPdfFontFromName(dict, dict->BaseFont().c_str());
-
- // TODO(edisonn): load encoding, let it now to be Identity-H by default
- if (dict->has_Encoding()) {
- if (dict->isEncodingAName()) {
- //report encoding not supported
- //fEncoding = loadEncodingFromName(dict->getEncodingAsName().c_str());
- } else if (dict->isEncodingAStream()) {
- //fEncoding = loadEncodingFromStream(dict->getEncodingAsStream());
- } else {
- // error
- }
- }
-
+SkPdfToUnicode::SkPdfToUnicode(const SkPdfStream* stream) {
fCMapEncoding = NULL;
fCMapEncodingFlag = NULL;
- if (dict->has_ToUnicode()) {
- const SkPdfStream* stream = dict->ToUnicode();
+ if (stream) {
SkPdfTokenizer tokenizer(stream);
PdfToken token;
@@ -318,3 +334,44 @@
}
}
}
+
+
+SkPdfType0Font::SkPdfType0Font(SkPdfType0FontDictionary* dict) {
+ fBaseFont = SkPdfFontFromName(dict, dict->BaseFont().c_str());
+ fEncoding = NULL;
+
+ if (dict->has_Encoding()) {
+ if (dict->isEncodingAName()) {
+ fEncoding = SkPdfEncoding::fromName(dict->getEncodingAsName().c_str());
+ } else if (dict->isEncodingAStream()) {
+ //fEncoding = loadEncodingFromStream(dict->getEncodingAsStream());
+ } else {
+ // TODO(edisonn): error ... warning .. assert?
+ }
+ }
+
+ if (dict->has_ToUnicode()) {
+ fToUnicode = new SkPdfToUnicode(dict->ToUnicode());
+ }
+}
+
+std::map<std::string, SkPdfEncoding*>& getStandardEncodings() {
+ static std::map<std::string, SkPdfEncoding*> encodings;
+ if (encodings.empty()) {
+ encodings["Identity-H"] = SkPdfIdentityHEncoding::instance();
+ }
+
+ return encodings;
+}
+
+
+SkPdfEncoding* SkPdfEncoding::fromName(const char* name) {
+ SkPdfEncoding* encoding = getStandardEncodings()[name];
+
+#ifdef PDF_TRACE
+ if (encoding == NULL) {
+ printf("Encoding not found: %s\n", name);
+ }
+#endif
+ return encoding;
+}