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Allow storing arbitrary data on FreeType Face objects

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This commit is contained in:
Kovid Goyal 2017-11-10 14:20:20 +05:30
parent 5c582f7639
commit 774956053a
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GPG Key ID: 06BC317B515ACE7C
2 changed files with 27 additions and 13 deletions
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2
kitty/fonts.h
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@ -23,3 +23,5 @@ bool render_glyphs_in_cells(PyObject *f, bool bold, bool italic, hb_glyph_info_t
void render_line(Line *line);
void sprite_tracker_set_limits(size_t max_texture_size, size_t max_array_len);
void sprite_tracker_set_layout(unsigned int cell_width, unsigned int cell_height);
typedef void (*free_extra_data_func)(void*);

38
kitty/freetype.c
View File

@ -29,6 +29,8 @@ typedef struct {
FT_UInt xdpi, ydpi;
PyObject *path;
hb_font_t *harfbuzz_font;
void *extra_data;
free_extra_data_func free_extra_data;
} Face;
static PyObject* FreeType_Exception = NULL;
@ -107,6 +109,24 @@ get_load_flags(int hinting, int hintstyle, int base) {
}
static inline bool
init_ft_face(Face *self, PyObject *path, int hinting, int hintstyle, float size_in_pts, float xdpi, float ydpi) {
#define CPY(n) self->n = self->face->n;
CPY(units_per_EM); CPY(ascender); CPY(descender); CPY(height); CPY(max_advance_width); CPY(max_advance_height); CPY(underline_position); CPY(underline_thickness);
#undef CPY
self->is_scalable = FT_IS_SCALABLE(self->face);
self->hinting = hinting; self->hintstyle = hintstyle;
if (!set_size_for_face((PyObject*)self, size_in_pts, xdpi, ydpi)) return false;
self->harfbuzz_font = hb_ft_font_create(self->face, NULL);
if (self->harfbuzz_font == NULL) { PyErr_NoMemory(); return false; }
hb_ft_font_set_load_flags(self->harfbuzz_font, get_load_flags(self->hinting, self->hintstyle, FT_LOAD_DEFAULT));
self->path = path;
Py_INCREF(self->path);
return true;
}
static PyObject*
new(PyTypeObject *type, PyObject *args, PyObject UNUSED *kwds) {
Face *self;
@ -118,19 +138,9 @@ new(PyTypeObject *type, PyObject *args, PyObject UNUSED *kwds) {
self = (Face *)type->tp_alloc(type, 0);
if (self != NULL) {
self->path = PyTuple_GET_ITEM(args, 0);
Py_INCREF(self->path);
error = FT_New_Face(library, path, index, &(self->face));
if(error) { set_freetype_error("Failed to load face, with error:", error); Py_CLEAR(self); return NULL; }
#define CPY(n) self->n = self->face->n;
CPY(units_per_EM); CPY(ascender); CPY(descender); CPY(height); CPY(max_advance_width); CPY(max_advance_height); CPY(underline_position); CPY(underline_thickness);
#undef CPY
self->is_scalable = FT_IS_SCALABLE(self->face);
self->hinting = hinting; self->hintstyle = hintstyle;
if (!set_size_for_face((PyObject*)self, size_in_pts, xdpi, ydpi)) { Py_CLEAR(self); return NULL; }
self->harfbuzz_font = hb_ft_font_create(self->face, NULL);
if (self->harfbuzz_font == NULL) { Py_CLEAR(self); return PyErr_NoMemory(); }
hb_ft_font_set_load_flags(self->harfbuzz_font, get_load_flags(self->hinting, self->hintstyle, FT_LOAD_DEFAULT));
if (!init_ft_face(self, PyTuple_GET_ITEM(args, 0), hinting, hintstyle, size_in_pts, xdpi, ydpi)) { Py_CLEAR(self); return NULL; }
}
return (PyObject*)self;
}
@ -139,6 +149,7 @@ static void
dealloc(Face* self) {
if (self->harfbuzz_font) hb_font_destroy(self->harfbuzz_font);
if (self->face) FT_Done_Face(self->face);
if (self->extra_data && self->free_extra_data) self->free_extra_data(self->extra_data);
Py_CLEAR(self->path);
Py_TYPE(self)->tp_free((PyObject*)self);
}
@ -347,8 +358,6 @@ PyTypeObject Face_Type = {
.tp_repr = (reprfunc)repr,
};
INIT_TYPE(Face)
static void
free_freetype() {
FT_Done_FreeType(library);
@ -356,6 +365,9 @@ free_freetype() {
bool
init_freetype_library(PyObject *m) {
if (PyType_Ready(&Face_Type) < 0) return 0;
if (PyModule_AddObject(m, "Face", (PyObject *)&Face_Type) != 0) return 0;
Py_INCREF(&Face_Type);
FreeType_Exception = PyErr_NewException("fast_data_types.FreeTypeError", NULL, NULL);
if (FreeType_Exception == NULL) return false;
if (PyModule_AddObject(m, "FreeTypeError", FreeType_Exception) != 0) return false;