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Configure cairo's 'options' with default values, then update the FontConfig pattern. Finally, update the cairo options after having retrieved the final FontConfig option.
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#include "font.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <fontconfig/fontconfig.h>
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#include <cairo-ft.h>
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#define LOG_MODULE "font"
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#include "log.h"
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static void __attribute__((constructor))
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init(void)
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{
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FcInit();
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}
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static void __attribute__((destructor))
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fini(void)
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{
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FcFini();
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}
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cairo_scaled_font_t *
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font_from_name(const char *name)
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{
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FcPattern *pattern = FcNameParse((const unsigned char *)name);
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if (pattern == NULL) {
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LOG_ERR("%s: failed to lookup font", name);
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return NULL;
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}
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if (!FcConfigSubstitute(NULL, pattern, FcMatchPattern)) {
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LOG_ERR("%s: failed to do config substitution", name);
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FcPatternDestroy(pattern);
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return NULL;
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}
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cairo_font_options_t *options = cairo_font_options_create();
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cairo_font_options_set_hint_style(options, CAIRO_HINT_STYLE_DEFAULT);
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cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_DEFAULT);
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cairo_font_options_set_subpixel_order(options, CAIRO_SUBPIXEL_ORDER_DEFAULT);
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cairo_ft_font_options_substitute(options, pattern);
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FcDefaultSubstitute(pattern);
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FcResult result;
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FcPattern *final_pattern = FcFontMatch(NULL, pattern, &result);
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FcPatternDestroy(pattern);
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if (final_pattern == NULL) {
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LOG_ERR("%s: failed to match font", name);
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return NULL;
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}
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FcBool fc_hinting, fc_antialias;
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if (FcPatternGetBool(final_pattern, FC_HINTING,0, &fc_hinting) != FcResultMatch) {
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LOG_WARN("failed to get fontconfig hinting style");
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fc_hinting = FcTrue;
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}
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if (FcPatternGetBool(final_pattern, FC_ANTIALIAS, 0, &fc_antialias) != FcResultMatch) {
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LOG_WARN("failed to get fontconfig antialias");
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fc_antialias = FcTrue;
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}
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cairo_font_options_set_hint_style(
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options, fc_hinting ? CAIRO_HINT_STYLE_DEFAULT : CAIRO_HINT_STYLE_NONE);
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cairo_font_options_set_antialias(
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options, fc_antialias ? CAIRO_ANTIALIAS_DEFAULT : CAIRO_ANTIALIAS_NONE);
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assert(cairo_font_options_get_antialias(options) == CAIRO_ANTIALIAS_NONE);
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double size;
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if (FcPatternGetDouble(final_pattern, FC_PIXEL_SIZE, 0, &size)) {
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LOG_ERR("%s: failed to get size", name);
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FcPatternDestroy(final_pattern);
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return NULL;
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}
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cairo_font_face_t *face = cairo_ft_font_face_create_for_pattern(
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final_pattern);
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FcPatternDestroy(final_pattern);
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if (cairo_font_face_status(face) != CAIRO_STATUS_SUCCESS) {
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LOG_ERR("%s: failed to create cairo font face", name);
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cairo_font_face_destroy(face);
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return NULL;
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}
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cairo_matrix_t matrix, ctm;
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cairo_matrix_init_identity(&ctm);
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cairo_matrix_init_scale(&matrix, size, size);
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cairo_scaled_font_t *scaled_font = cairo_scaled_font_create(
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face, &matrix, &ctm, options);
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cairo_font_options_destroy(options);
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cairo_font_face_destroy(face);
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if (cairo_scaled_font_status(scaled_font) != CAIRO_STATUS_SUCCESS) {
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LOG_ERR("%s: failed to create scaled font", name);
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cairo_scaled_font_destroy(scaled_font);
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return NULL;
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}
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return scaled_font;
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}
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