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LibPDF: Add some CIDFontType0C scaffolding

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No real behavior change. We don't actually load the CFF data yet
(blocked on #23136 and some more), and we don't have drawing code
yet, and Type0Font::draw_string() doesn't do any drawing yet.

But it's a step in the right direction.
This commit is contained in:
Nico Weber 2024-02-11 21:41:05 -05:00 • committed by Jelle Raaijmakers
parent 95d91a37d2
commit 6df0150671
2 changed files with 44 additions and 1 deletions
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1
Userland/Libraries/LibPDF/CommonNames.h
View file

@ -32,6 +32,7 @@
X(CF) \
X(CFM) \
X(CIDFontType0) \
X(CIDFontType0C) \
X(CIDFontType2) \
X(CIDSystemInfo) \
X(CIDToGIDMap) \

44
Userland/Libraries/LibPDF/Fonts/Type0Font.cpp
View file

@ -6,6 +6,7 @@
#include <LibGfx/Font/ScaledFont.h>
#include <LibPDF/CommonNames.h>
#include <LibPDF/Fonts/CFF.h>
#include <LibPDF/Fonts/Type0Font.h>
namespace PDF {
@ -18,9 +19,50 @@ public:
class CIDFontType0 : public CIDFontType {
public:
static PDFErrorOr<NonnullOwnPtr<CIDFontType0>> create(Document*, NonnullRefPtr<DictObject> const& descendant);
PDFErrorOr<Gfx::FloatPoint> draw_string(Gfx::Painter&, Gfx::FloatPoint, ByteString const&) override;
private:
CIDFontType0(RefPtr<Type1FontProgram> font_program)
: m_font_program(move(font_program))
{
}
RefPtr<Type1FontProgram> m_font_program;
};
PDFErrorOr<NonnullOwnPtr<CIDFontType0>> CIDFontType0::create(Document* document, NonnullRefPtr<DictObject> const& descendant)
{
auto descriptor = TRY(descendant->get_dict(document, CommonNames::FontDescriptor));
RefPtr<Type1FontProgram> font_program;
// See spec comment in CIDFontType0::draw_string().
if (descriptor->contains(CommonNames::FontFile3)) {
auto font_file_stream = TRY(descriptor->get_stream(document, CommonNames::FontFile3));
auto font_file_dict = font_file_stream->dict();
DeprecatedFlyString subtype;
if (font_file_dict->contains(CommonNames::Subtype))
subtype = font_file_dict->get_name(CommonNames::Subtype)->name();
if (subtype == CommonNames::CIDFontType0C) {
// FIXME: Call CFF::create() and assign the result to font_program once CFF::create() can handle CID-keyed fonts.
return Error::rendering_unsupported_error("Type0 font CIDFontType0: support for CIDFontType0C not yet implemented");
} else {
// FIXME: Add support for /OpenType.
dbgln("CIDFontType0: unsupported FontFile3 subtype '{}'", subtype);
return Error::rendering_unsupported_error("Type0 font CIDFontType0: support for non-CIDFontType0C not yet implemented");
}
}
if (!font_program) {
// FIXME: Should we use a fallback font? How common is this for type 0 fonts?
return Error::malformed_error("CIDFontType0: missing FontFile3");
}
return TRY(adopt_nonnull_own_or_enomem(new (nothrow) CIDFontType0(move(font_program))));
}
PDFErrorOr<Gfx::FloatPoint> CIDFontType0::draw_string(Gfx::Painter&, Gfx::FloatPoint, ByteString const&)
{
// ISO 32000 (PDF 2.0) 9.7.4.2 Glyph selection in CIDFonts
@ -114,7 +156,7 @@ PDFErrorOr<void> Type0Font::initialize(Document* document, NonnullRefPtr<DictObj
auto subtype = TRY(descendant_font->get_name(document, CommonNames::Subtype))->name();
if (subtype == CommonNames::CIDFontType0) {
// CFF-based
m_cid_font_type = TRY(try_make<CIDFontType0>());
m_cid_font_type = TRY(CIDFontType0::create(document, descendant_font));
} else if (subtype == CommonNames::CIDFontType2) {
// TrueType-based
m_cid_font_type = TRY(CIDFontType2::create(document, descendant_font, font_size));