129 lines
3.2 KiB
C
129 lines
3.2 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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#include "cairo.h"
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#include "log.h"
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#include "stringop.h"
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#define MAX_CHARS 16384
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static const char overflow[] = "[buffer overflow]";
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size_t escape_markup_text(const char *src, char *dest) {
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size_t length = 0;
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if (dest) {
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dest[0] = '\0';
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}
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while (src[0]) {
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switch (src[0]) {
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case '&':
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length += 5;
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lenient_strcat(dest, "&");
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break;
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case '<':
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length += 4;
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lenient_strcat(dest, "<");
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break;
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case '>':
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length += 4;
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lenient_strcat(dest, ">");
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break;
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case '\'':
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length += 6;
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lenient_strcat(dest, "'");
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break;
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case '"':
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length += 6;
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lenient_strcat(dest, """);
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break;
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default:
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if (dest) {
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dest[length] = *src;
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dest[length + 1] = '\0';
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}
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length += 1;
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}
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src++;
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}
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return length;
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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, bool markup) {
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PangoLayout *layout = pango_cairo_create_layout(cairo);
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PangoAttrList *attrs;
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if (markup) {
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char *buf;
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GError *error = NULL;
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if (pango_parse_markup(text, -1, 0, &attrs, &buf, NULL, &error)) {
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pango_layout_set_text(layout, buf, -1);
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free(buf);
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} else {
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wlr_log(WLR_ERROR, "pango_parse_markup '%s' -> error %s", text,
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error->message);
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g_error_free(error);
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markup = false; // fallback to plain text
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}
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}
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if (!markup) {
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attrs = pango_attr_list_new();
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pango_layout_set_text(layout, text, -1);
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}
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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, bool markup, const char *fmt, ...) {
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char buf[MAX_CHARS];
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va_list args;
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va_start(args, fmt);
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if (vsnprintf(buf, sizeof(buf), fmt, args) >= MAX_CHARS) {
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strcpy(&buf[sizeof(buf) - sizeof(overflow)], overflow);
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}
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va_end(args);
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PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup);
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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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}
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void pango_printf(cairo_t *cairo, const char *font,
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double scale, bool markup, const char *fmt, ...) {
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char buf[MAX_CHARS];
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va_list args;
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va_start(args, fmt);
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if (vsnprintf(buf, sizeof(buf), fmt, args) >= MAX_CHARS) {
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strcpy(&buf[sizeof(buf) - sizeof(overflow)], overflow);
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}
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va_end(args);
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PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup);
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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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}
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