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ft2font: Add internal API for accessing font variations
1 parent 2e0fee1 commit b5bda9b

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Lines changed: 418 additions & 0 deletions

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‎lib/matplotlib/ft2font.pyi‎

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Original file line numberDiff line numberDiff line change
@@ -215,6 +215,34 @@ class _SfntPcltDict(TypedDict):
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widthType: int
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serifStyle: int
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class VarAxisFlags(Flag):
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DEFAULT = cast(int, ...)
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HIDDEN = cast(int, ...)
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@final
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class VariationAxis:
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@property
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def name(self) -> str: ...
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@property
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def minimum(self) -> float: ...
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@property
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def default(self) -> float: ...
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@property
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def maximum(self) -> float: ...
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@property
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def tag(self) -> int: ...
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@property
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def names(self) -> dict[tuple[int, int, int], str | bytes]: ...
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@property
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def flags(self) -> VarAxisFlags: ...
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@final
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class VariationNamedStyle:
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@property
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def names(self) -> dict[tuple[int, int, int], str | bytes]: ...
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@property
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def psnames(self) -> dict[tuple[int, int, int], str | bytes] | None: ...
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@final
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class LayoutItem:
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@property
@@ -299,6 +327,10 @@ class FT2Font(Buffer):
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features: tuple[str] | None = ...,
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language: str | list[tuple[str, int, int]] | None = ...,
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) -> NDArray[np.float64]: ...
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def get_variation_descriptor(self) -> tuple[list[VariationAxis], list[VariationNamedStyle]]: ...
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def get_default_variation_style(self) -> int: ...
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def get_variations(self) -> tuple[float, ...]: ...
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def set_variations(self, variations: tuple[float, ...] | int) -> None: ...
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@property
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def ascender(self) -> int: ...
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@property

‎lib/matplotlib/tests/test_ft2font.py‎

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Original file line numberDiff line numberDiff line change
@@ -905,6 +905,20 @@ def test_ft2font_loading():
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assert font.get_bitmap_offset() == (0, 0)
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def test_ft2font_variations_invalid():
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# Smoke test as we don't have a font that has variations built in.
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file = fm.findfont('DejaVu Sans')
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font = ft2font.FT2Font(file)
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with pytest.raises(RuntimeError):
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font.get_variation_descriptor()
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with pytest.raises(RuntimeError):
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font.get_variations()
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with pytest.raises(RuntimeError):
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font.get_default_variation_style()
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with pytest.raises(RuntimeError):
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font.set_variations([0.0])
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def test_ft2font_drawing():
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expected_str = (
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' ',

‎src/ft2font.cpp‎

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Original file line numberDiff line numberDiff line change
@@ -780,3 +780,73 @@ long FT2Font::get_name_index(char *name)
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{
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return FT_Get_Name_Index(face, (FT_String *)name);
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}
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FT2Font::VariationInfo FT2Font::get_variation_descriptor()
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{
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FT_MM_Var *master;
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FT_CHECK(FT_Get_MM_Var, face, &master);
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std::vector<VariationAxis> axes;
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axes.reserve(master->num_axis);
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for (FT_UInt axis_index = 0; axis_index < master->num_axis; axis_index++) {
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FT_UInt flags = 0;
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FT_CHECK(FT_Get_Var_Axis_Flags, master, axis_index, &flags);
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const auto &axis = master->axis[axis_index];
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axes.emplace_back(axis.name,
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float(axis.minimum) / (1<<16),
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float(axis.def) / (1<<16),
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float(axis.maximum) / (1<<16),
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axis.tag,
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axis.strid,
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flags);
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}
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std::vector<VariationNamedStyle> styles;
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styles.reserve(master->num_namedstyles);
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for (FT_UInt instance = 0; instance < master->num_namedstyles; instance++) {
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const auto &style = master->namedstyle[instance];
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styles.emplace_back(style.strid, style.psid);
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}
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FT_CHECK(FT_Done_MM_Var, _ft2Library, master);
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return {axes, styles};
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}
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FT_UInt FT2Font::get_default_variation_style() {
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FT_UInt result;
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FT_CHECK(FT_Get_Default_Named_Instance, face, &result);
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return result;
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}
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std::vector<double> FT2Font::get_variations() {
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FT_MM_Var *master;
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FT_CHECK(FT_Get_MM_Var, face, &master);
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std::vector<FT_Fixed> fixed_coords(master->num_axis);
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FT_CHECK(FT_Done_MM_Var, _ft2Library, master);
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FT_CHECK(FT_Get_Var_Design_Coordinates, face, fixed_coords.size(),
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fixed_coords.data());
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std::vector<double> coords;
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coords.reserve(fixed_coords.size());
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for (auto const &c : fixed_coords) {
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coords.emplace_back(static_cast<double>(c) / (1 << 16));
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}
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return coords;
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}
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void FT2Font::set_variations(std::vector<double> coords) {
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std::vector<FT_Fixed> fixed_coords;
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fixed_coords.reserve(coords.size());
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for (auto const &c : coords) {
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fixed_coords.emplace_back(static_cast<FT_Fixed>(c * (1 << 16)));
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}
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FT_CHECK(FT_Set_Var_Design_Coordinates, face, fixed_coords.size(),
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fixed_coords.data());
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}
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void FT2Font::set_variations(FT_UInt instance_index) {
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FT_CHECK(FT_Set_Named_Instance, face, instance_index);
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}

‎src/ft2font.h‎

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Original file line numberDiff line numberDiff line change
@@ -22,9 +22,11 @@ extern "C" {
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#include FT_BITMAP_H
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#include FT_MULTIPLE_MASTERS_H
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#include FT_OUTLINE_H
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#include FT_SFNT_NAMES_H
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#include FT_TYPE1_TABLES_H
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#include FT_TRUETYPE_IDS_H
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#include FT_TRUETYPE_TABLES_H
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}
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@@ -183,6 +185,23 @@ class FT2Font
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return FT_HAS_KERNING(face);
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}
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using VariationAxis = std::tuple<
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std::string, // name
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FT_Fixed, // minimum
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FT_Fixed, // default
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FT_Fixed, // maximum
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FT_ULong, // tag
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FT_UInt, // name ID
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FT_UInt>; // flags
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using VariationNamedStyle = std::tuple<FT_UInt, FT_UInt>; // name ID, postscript ID
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using VariationInfo = std::tuple<std::vector<VariationAxis>,
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std::vector<VariationNamedStyle>>;
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VariationInfo get_variation_descriptor();
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FT_UInt get_default_variation_style();
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std::vector<double> get_variations();
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void set_variations(std::vector<double> coords);
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void set_variations(FT_UInt instance_index);
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protected:
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virtual void ft_glyph_warn(FT_ULong charcode, std::set<FT_String*> family_names) = 0;
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private:

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