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LibPDF: Include width in Type1Font glyph cache key

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LibGfx's ScaledFont doesn't do this, but in ScaledFont m_x_scale and
m_y_scale are immutable once the class is created, so it can get away
with not doing it.

In Type1Font, `width` changes in different calls to
Type1Font::draw_glyph(), so we need to make it part of the cache key.

Fixes rendering of the word "Version" on the first page of
pdf_reference_1-7.pdf.
This commit is contained in:
Nico Weber 2023-07-20 21:43:00 -04:00 • committed by Andreas Kling
parent 17a5af04e3
commit 9283c939bb
2 changed files with 22 additions and 2 deletions
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2
Userland/Libraries/LibPDF/Fonts/Type1Font.cpp
View file

@ -79,7 +79,7 @@ void Type1Font::draw_glyph(Gfx::Painter& painter, Gfx::FloatPoint point, float w
point = point.translated(translation);
auto glyph_position = Gfx::GlyphRasterPosition::get_nearest_fit_for(point);
Gfx::GlyphIndexWithSubpixelOffset index { char_code, glyph_position.subpixel_offset };
Type1GlyphCacheKey index { char_code, glyph_position.subpixel_offset, width };
RefPtr<Gfx::Bitmap> bitmap;
auto maybe_bitmap = m_glyph_cache.get(index);

22
Userland/Libraries/LibPDF/Fonts/Type1Font.h
View file

@ -12,6 +12,14 @@
namespace PDF {
struct Type1GlyphCacheKey {
u32 glyph_id;
Gfx::GlyphSubpixelOffset subpixel_offset;
float width;
bool operator==(Type1GlyphCacheKey const&) const = default;
};
class Type1Font : public SimpleFont {
public:
float get_glyph_width(u8 char_code) const override;
@ -25,7 +33,19 @@ protected:
private:
RefPtr<Type1FontProgram> m_font_program;
RefPtr<Gfx::Font> m_font;
HashMap<Gfx::GlyphIndexWithSubpixelOffset, RefPtr<Gfx::Bitmap>> m_glyph_cache;
HashMap<Type1GlyphCacheKey, RefPtr<Gfx::Bitmap>> m_glyph_cache;
};
}
namespace AK {
template<>
struct Traits<PDF::Type1GlyphCacheKey> : public GenericTraits<PDF::Type1GlyphCacheKey> {
static unsigned hash(PDF::Type1GlyphCacheKey const& index)
{
return pair_int_hash(pair_int_hash(index.glyph_id, (index.subpixel_offset.x << 8) | index.subpixel_offset.y), int_hash(bit_cast<u32>(index.width)));
}
};
}