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Implement loading of bitmap fonts via FreeType

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Needed for some fallback fonts such as Apple Color Emoji
This commit is contained in:
Kovid Goyal
2017-11-11 08:07:18 +05:30
parent 51fe1e4dab
commit 4edfa9f4fd
1 changed files with 25 additions and 1 deletions
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26
kitty/freetype.c
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@@ -6,6 +6,7 @@
*/
#include "fonts.h"
#include "state.h"
#include <math.h>
#include <structmember.h>
#include <ft2build.h>
@@ -86,7 +87,30 @@ set_font_size(Face *self, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt
#endif
}
} else {
set_freetype_error("Failed to set char size, with error:", error); return false;
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 = ceil(((double)char_height / 64.) * (double)ydpi / 72.);
desired_height += ceil(0.2 * desired_height);
}
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;
if (diff < min_diff) {
min_diff = diff;
strike_index = i;
}
}
if (strike_index > -1) {
error = FT_Select_Size(self->face, strike_index);
if (error) { set_freetype_error("Failed to set char size for non-scaleable font, with error:", error); return false; }
return true;
}
}
set_freetype_error("Failed to set char size, with error:", error);
return false;
}
return !error;
}