From 2f1c189d535c2d8dce74ec44c670305f00e4a30c Mon Sep 17 00:00:00 2001
From: adnano <me@adnano.co>
Date: Sun, 16 Jan 2022 08:32:58 -0500
Subject: Initial commit

---
 pango.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 pango.c

(limited to 'pango.c')

diff --git a/pango.c b/pango.c
new file mode 100644
index 0000000..ac5ff4e
--- /dev/null
+++ b/pango.c
@@ -0,0 +1,98 @@
+#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);
+}
-- 
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