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Adjust the point size of fallback and symbol fonts so that their heights match the current cell height

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Kovid Goyal
2017-11-12 10:30:57 +05:30
parent 604e82fd65
commit 67a37f1f41
3 changed files with 30 additions and 23 deletions
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41
kitty/freetype.c
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@@ -70,10 +70,22 @@ set_freetype_error(const char* prefix, int err_code) {
static FT_Library library;
#define CALC_CELL_HEIGHT(self) font_units_to_pixels(self, self->height)
static inline int
font_units_to_pixels(Face *self, int x) {
return ceil((double)FT_MulFix(x, self->face->size->metrics.y_scale) / 64.0);
}
static inline bool
set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt xdpi, FT_UInt ydpi) {
int error = FT_Set_Char_Size(self->face, char_width, char_height, xdpi, ydpi);
set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt xdpi, FT_UInt ydpi, unsigned int desired_height) {
int error = FT_Set_Char_Size(self->face, 0, char_height, xdpi, ydpi);
if (!error) {
unsigned int ch = CALC_CELL_HEIGHT(self);
if (desired_height && ch != desired_height) {
FT_F26Dot6 h = floor((double)char_height * (double)desired_height / (double) ch);
return set_font_size(self, 0, h, xdpi, ydpi, 0);
}
self->char_width = char_width; self->char_height = char_height; self->xdpi = xdpi; self->ydpi = ydpi;
if (self->harfbuzz_font != NULL) {
#ifdef HARFBUZZ_HAS_CHANGE_FONT
@@ -89,7 +101,7 @@ set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt
} else {
if (!self->is_scalable && self->face->num_fixed_sizes > 0) {
int32_t min_diff = INT32_MAX;
int desired_height = global_state.cell_height;
if (desired_height == 0) desired_height = global_state.cell_height;
if (desired_height == 0) {
desired_height = ceil(((double)char_height / 64.) * (double)ydpi / 72.);
desired_height += ceil(0.2 * desired_height);
@@ -97,7 +109,7 @@ set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt
FT_Int strike_index = -1;
for (FT_Int i = 0; i < self->face->num_fixed_sizes; i++) {
int h = self->face->available_sizes[i].height;
int32_t diff = h < desired_height ? desired_height - h : h - desired_height;
int32_t diff = h < (int32_t)desired_height ? (int32_t)desired_height - h : h - (int32_t)desired_height;
if (diff < min_diff) {
min_diff = diff;
strike_index = i;
@@ -116,12 +128,12 @@ set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt
}
bool
set_size_for_face(PyObject *s, unsigned int UNUSED desired_height) {
set_size_for_face(PyObject *s, unsigned int desired_height, bool force) {
Face *self = (Face*)s;
FT_UInt w = (FT_UInt)(ceil(global_state.font_sz_in_pts * 64.0));
if (self->char_width == w && self->char_height == w && self->xdpi == (FT_UInt)global_state.logical_dpi_x && self->ydpi == (FT_UInt)global_state.logical_dpi_x) return true;
FT_UInt w = (FT_UInt)(ceil(global_state.font_sz_in_pts * 64.0)), xdpi = (FT_UInt)global_state.logical_dpi_x, ydpi = (FT_UInt)global_state.logical_dpi_y;
if (!force && (self->char_width == w && self->char_height == w && self->xdpi == xdpi && self->ydpi == ydpi)) return true;
((Face*)self)->size_in_pts = global_state.font_sz_in_pts;
return set_font_size(self, w, w, (FT_UInt)global_state.logical_dpi_x, (FT_UInt)global_state.logical_dpi_y);
return set_font_size(self, w, w, xdpi, ydpi, desired_height);
}
static inline int
@@ -142,7 +154,7 @@ init_ft_face(Face *self, PyObject *path, int hinting, int hintstyle) {
#undef CPY
self->is_scalable = FT_IS_SCALABLE(self->face);
self->hinting = hinting; self->hintstyle = hintstyle;
if (!set_size_for_face((PyObject*)self, 0)) return false;
if (!set_size_for_face((PyObject*)self, 0, false)) 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));
@@ -273,16 +285,11 @@ calc_cell_width(Face *self) {
return ans;
}
static inline int
font_units_to_pixels(Face *self, int x) {
return ceil((double)FT_MulFix(x, self->face->size->metrics.y_scale) / 64.0);
}
void
cell_metrics(PyObject *s, unsigned int* cell_width, unsigned int* cell_height, unsigned int* baseline, unsigned int* underline_position, unsigned int* underline_thickness) {
Face *self = (Face*)s;
*cell_width = calc_cell_width(self);
*cell_height = font_units_to_pixels(self, self->height);
*cell_height = CALC_CELL_HEIGHT(self);
#ifdef __APPLE__
// See https://stackoverflow.com/questions/5511830/how-does-line-spacing-work-in-core-text-and-why-is-it-different-from-nslayoutm
if (self->apple_leading <= 0) {
@@ -344,9 +351,9 @@ render_bitmap(Face *self, int glyph_id, ProcessedBitmap *ans, unsigned int cell_
} else if (rescale && self->is_scalable && extra > MAX(2, cell_width / 3)) {
FT_F26Dot6 char_width = self->char_width, char_height = self->char_height;
float ar = (float)max_width / (float)bitmap->width;
if (set_font_size(self, (FT_F26Dot6)((float)self->char_width * ar), (FT_F26Dot6)((float)self->char_height * ar), self->xdpi, self->ydpi)) {
if (set_font_size(self, (FT_F26Dot6)((float)self->char_width * ar), (FT_F26Dot6)((float)self->char_height * ar), self->xdpi, self->ydpi, 0)) {
if (!render_bitmap(self, glyph_id, ans, cell_width, num_cells, bold, italic, false)) return false;
if (!set_font_size(self, char_width, char_height, self->xdpi, self->ydpi)) return false;
if (!set_font_size(self, char_width, char_height, self->xdpi, self->ydpi, 0)) return false;
} else return false;
}
}