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