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Set the palette index cairo font option

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Kovid Goyal 2025-01-30 12:03:38 +05:30
parent 3d06cb8709
commit bab14e8612
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GPG key ID: 06BC317B515ACE7C
1 changed files with 33 additions and 3 deletions
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36
kitty/freetype.c
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@ -23,6 +23,7 @@
#include FT_TRUETYPE_TABLES_H
#include FT_MULTIPLE_MASTERS_H
#include FT_SFNT_NAMES_H
#include FT_TYPES_H
typedef union FaceIndex {
struct {
@ -64,6 +65,7 @@ typedef struct {
free_extra_data_func free_extra_data;
PyObject *name_lookup_table;
FontFeatures font_features;
unsigned short dark_palette_index, light_palette_index, palettes_scanned;
} Face;
PyTypeObject Face_Type;
@ -666,6 +668,31 @@ free_cairo(Face *self) {
static void
cairo_done_ft_face(void* x) { if (x) FT_Done_Face(x); }
static bool
is_color_dark(color_type c) {
ARGB32 bg = {.val=c};
return rgb_luminance(bg) / 255.0 < 0.5;
}
static unsigned short
get_preferred_palette_index(Face *self) {
if (!self->palettes_scanned) {
self->palettes_scanned = 1;
self->dark_palette_index = CAIRO_COLOR_PALETTE_DEFAULT; self->light_palette_index = CAIRO_COLOR_PALETTE_DEFAULT;
FT_Palette_Data palette_data;
FT_Error error = FT_Palette_Data_Get(self->face, &palette_data);
if (error) log_error("Could not retrieve palette data for font from FreeType");
else if (palette_data.palette_flags) {
for (FT_UShort i = 0; i < palette_data.num_palettes; i++) {
FT_UShort flags = palette_data.palette_flags[i];
if (flags & FT_PALETTE_FOR_DARK_BACKGROUND) self->dark_palette_index = i;
else if (flags & FT_PALETTE_FOR_DARK_BACKGROUND) self->light_palette_index = i;
}
}
}
return is_color_dark(OPT(background)) ? self->dark_palette_index : self->light_palette_index;
}
static bool
ensure_cairo_resources(Face *self, size_t width, size_t height) {
if (!self->cairo.font) {
@ -721,6 +748,11 @@ ensure_cairo_resources(Face *self, size_t width, size_t height) {
cairo_font_options_destroy(opts);
return set_cairo_exception("Failed to set cairo hintstyle", s);
}
cairo_font_options_set_color_palette(opts, get_preferred_palette_index(self));
if ((s = cairo_font_options_status(opts)) != CAIRO_STATUS_SUCCESS) {
cairo_font_options_destroy(opts);
return set_cairo_exception("Failed to set cairo palette index", s);
}
cairo_set_font_options(self->cairo.cr, opts);
cairo_font_options_destroy(opts);
}
@ -796,9 +828,7 @@ render_glyph_with_cairo(Face *self, int glyph_id, ProcessedBitmap *ans, unsigned
static bool
render_color_bitmap(Face *self, int glyph_id, ProcessedBitmap *ans, unsigned int cell_width, unsigned int cell_height, unsigned int num_cells, unsigned int baseline) {
const unsigned int width_to_render_in = num_cells * cell_width;
ARGB32 bg = {.val=OPT(background)};
bool is_dark = rgb_luminance(bg) / 255.0 < 0.5;
uint8_t v = is_dark ? 255 : 0;
uint8_t v = is_color_dark(OPT(background)) ? 255 : 0;
ARGB32 fg = {.red = v, .green = v, .blue = v, .alpha=255};
return render_glyph_with_cairo(self, glyph_id, ans, width_to_render_in, cell_height, fg, baseline);
}