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adnano 2022-01-16 08:32:58 -05:00
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#include <cairo/cairo.h>
#include <pango/pangocairo.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int get_font_height(char *fontstr) {
PangoFontMap *fontmap = pango_cairo_font_map_get_default();
PangoContext *context = pango_font_map_create_context(fontmap);
PangoFontDescription *desc = pango_font_description_from_string(fontstr);
PangoFont *font = pango_font_map_load_font(fontmap, context, desc);
if (font == NULL) {
return -1;
}
PangoFontMetrics *metrics = pango_font_get_metrics(font, NULL);
int height = pango_font_metrics_get_height(metrics) / PANGO_SCALE;
pango_font_description_free(desc);
pango_font_metrics_unref(metrics);
return height;
}
PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
const char *text, double scale) {
PangoLayout *layout = pango_cairo_create_layout(cairo);
PangoAttrList *attrs = pango_attr_list_new();
pango_layout_set_text(layout, text, -1);
pango_attr_list_insert(attrs, pango_attr_scale_new(scale));
PangoFontDescription *desc = pango_font_description_from_string(font);
pango_layout_set_font_description(layout, desc);
pango_layout_set_single_paragraph_mode(layout, 1);
pango_layout_set_attributes(layout, attrs);
pango_attr_list_unref(attrs);
pango_font_description_free(desc);
return layout;
}
void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
int *baseline, double scale, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
// Add one since vsnprintf excludes null terminator.
int length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *buf = malloc(length);
if (buf == NULL) {
return;
}
va_start(args, fmt);
vsnprintf(buf, length, fmt, args);
va_end(args);
PangoLayout *layout = get_pango_layout(cairo, font, buf, scale);
pango_cairo_update_layout(cairo, layout);
pango_layout_get_pixel_size(layout, width, height);
if (baseline) {
*baseline = pango_layout_get_baseline(layout) / PANGO_SCALE;
}
g_object_unref(layout);
free(buf);
}
int text_width(cairo_t *cairo, const char *font, const char *text) {
int text_width;
get_text_size(cairo, font, &text_width, NULL, NULL, 1, text);
return text_width;
}
void pango_printf(cairo_t *cairo, const char *font, double scale,
const char *fmt, ...) {
va_list args;
va_start(args, fmt);
// Add one since vsnprintf excludes null terminator.
int length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *buf = malloc(length);
if (buf == NULL) {
return;
}
va_start(args, fmt);
vsnprintf(buf, length, fmt, args);
va_end(args);
PangoLayout *layout = get_pango_layout(cairo, font, buf, scale);
cairo_font_options_t *fo = cairo_font_options_create();
cairo_get_font_options(cairo, fo);
pango_cairo_context_set_font_options(pango_layout_get_context(layout), fo);
cairo_font_options_destroy(fo);
pango_cairo_update_layout(cairo, layout);
pango_cairo_show_layout(cairo, layout);
g_object_unref(layout);
free(buf);
}