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Font fallback: Fix the font used to render a character sometimes dependent on the order in which characters appear on screen

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We ameliorate the performance hit by storing a hash table mapping cell
text to the loaded fallback font index so that lookups for previously
seen text are still fast.

Fixes #6865
This commit is contained in:
Kovid Goyal
2023-12-11 20:27:21 +05:30
parent 7cec82f453
commit d9ccbcd0ce
6 changed files with 85 additions and 14 deletions
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13
kitty/freetype.c
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@@ -218,6 +218,17 @@ set_load_error(const char *path, int error) {
return NULL;
}
bool
face_equals_descriptor(PyObject *face_, PyObject *descriptor) {
Face *face = (Face*)face_;
PyObject *t = PyDict_GetItemString(descriptor, "path");
if (!t) return false;
if (PyObject_RichCompareBool(face->path, t, Py_EQ) != 1) return false;
t = PyDict_GetItemString(descriptor, "index");
if (t && PyLong_AsLong(t) != face->index) return false;
return true;
}
PyObject*
face_from_descriptor(PyObject *descriptor, FONTS_DATA_HANDLE fg) {
#define D(key, conv, missing_ok) { \
@@ -285,7 +296,6 @@ repr(Face *self) {
);
}
const char*
postscript_name_for_face(const PyObject *face_) {
const Face *self = (const Face*)face_;
@@ -723,7 +733,6 @@ static PyMethodDef methods[] = {
{NULL} /* Sentinel */
};
PyTypeObject Face_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "fast_data_types.Face",