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Also delete DescendantFonts of Type0 fonts

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Kovid Goyal 2019-07-24 12:04:58 +05:30
parent 7f3bd476d3
commit 6057bcbb5a
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 51 additions and 43 deletions
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94
src/calibre/utils/podofo/fonts.cpp
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@ -251,56 +251,64 @@ typedef std::unordered_map<PdfReference, unsigned long, PdfReferenceHasher> char
PyObject*
remove_unused_fonts(PDFDoc *self, PyObject *args) {
unordered_reference_set used_fonts;
for (int i = 0; i < self->doc->GetPageCount(); i++) {
PdfPage *page = self->doc->GetPage(i);
if (page) used_fonts_in_page(page, used_fonts);
}
unordered_reference_set all_fonts;
unordered_reference_set type3_fonts;
charprocs_usage_map charprocs_usage;
PdfVecObjects &objects = self->doc->GetObjects();
for (TCIVecObjects it = objects.begin(); it != objects.end(); it++) {
if ((*it)->IsDictionary()) {
const PdfDictionary &dict = (*it)->GetDictionary();
if (dictionary_has_key_name(dict, PdfName::KeyType, "Font")) {
const std::string &font_type = dict.GetKey(PdfName::KeySubtype)->GetName().GetName();
if (font_type == "Type0") {
all_fonts.insert((*it)->Reference());
} else if (font_type == "Type3") {
all_fonts.insert((*it)->Reference());
type3_fonts.insert((*it)->Reference());
for (auto &x : dict.GetKey("CharProcs")->GetDictionary().GetKeys()) {
const PdfReference &ref = x.second->GetReference();
if (charprocs_usage.find(ref) == charprocs_usage.end()) charprocs_usage[ref] = 1;
else charprocs_usage[ref] += 1;
}
}
}
}
}
unsigned long count = 0;
for (auto &ref : all_fonts) {
if (used_fonts.find(ref) == used_fonts.end()) {
PdfObject *font = objects.GetObject(ref);
if (font) {
count++;
if (type3_fonts.find(ref) != type3_fonts.end()) {
for (auto &x : font->GetIndirectKey("CharProcs")->GetDictionary().GetKeys()) {
charprocs_usage[x.second->GetReference()] -= 1;
try {
unordered_reference_set used_fonts;
for (int i = 0; i < self->doc->GetPageCount(); i++) {
PdfPage *page = self->doc->GetPage(i);
if (page) used_fonts_in_page(page, used_fonts);
}
unordered_reference_set all_fonts;
unordered_reference_set type3_fonts;
charprocs_usage_map charprocs_usage;
PdfVecObjects &objects = self->doc->GetObjects();
for (TCIVecObjects it = objects.begin(); it != objects.end(); it++) {
if ((*it)->IsDictionary()) {
const PdfDictionary &dict = (*it)->GetDictionary();
if (dictionary_has_key_name(dict, PdfName::KeyType, "Font")) {
const std::string &font_type = dict.GetKey(PdfName::KeySubtype)->GetName().GetName();
if (font_type == "Type0") {
all_fonts.insert((*it)->Reference());
} else if (font_type == "Type3") {
all_fonts.insert((*it)->Reference());
type3_fonts.insert((*it)->Reference());
for (auto &x : dict.GetKey("CharProcs")->GetDictionary().GetKeys()) {
const PdfReference &ref = x.second->GetReference();
if (charprocs_usage.find(ref) == charprocs_usage.end()) charprocs_usage[ref] = 1;
else charprocs_usage[ref] += 1;
}
}
}
remove_font(objects, font);
}
}
}
for (auto &x : charprocs_usage) {
if (x.second == 0u) {
delete objects.RemoveObject(x.first);
for (auto &ref : all_fonts) {
if (used_fonts.find(ref) == used_fonts.end()) {
PdfObject *font = objects.GetObject(ref);
if (font) {
count++;
if (type3_fonts.find(ref) != type3_fonts.end()) {
for (auto &x : font->GetIndirectKey("CharProcs")->GetDictionary().GetKeys()) {
charprocs_usage[x.second->GetReference()] -= 1;
}
} else {
for (auto &x : font->GetIndirectKey("DescendantFonts")->GetArray()) {
PdfObject *dfont = objects.GetObject(x.GetReference());
if (dfont) remove_font(objects, dfont);
}
}
remove_font(objects, font);
}
}
}
}
for (auto &x : charprocs_usage) {
if (x.second == 0u) {
delete objects.RemoveObject(x.first);
}
}
} catch(const PdfError &err) { podofo_set_exception(err); return NULL; }
return Py_BuildValue("k", count);
}