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// Copyright (C) 2004-2024 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.
#include "mupdf/fitz.h"
#include "html-imp.h"
#include <string.h>
static fz_font *
fz_load_html_default_font(fz_context *ctx, fz_html_font_set *set, const char *family, int is_bold, int is_italic)
{
int is_mono = !strcmp(family, "monospace");
int is_sans = !strcmp(family, "sans-serif");
const char *real_family = is_mono ? "Courier" : is_sans ? "Helvetica" : "Charis SIL";
const char *backup_family = is_mono ? "Courier" : is_sans ? "Helvetica" : "Times";
int idx = (is_mono ? 8 : is_sans ? 4 : 0) + is_bold * 2 + is_italic;
if (!set->fonts[idx])
{
const unsigned char *data;
int size;
data = fz_lookup_builtin_font(ctx, real_family, is_bold, is_italic, &size);
if (!data)
data = fz_lookup_builtin_font(ctx, backup_family, is_bold, is_italic, &size);
if (!data)
fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "cannot load html font: %s", real_family);
set->fonts[idx] = fz_new_font_from_memory(ctx, NULL, data, size, 0, 1);
fz_font_flags(set->fonts[idx])->is_serif = !is_sans;
}
return set->fonts[idx];
}
void
fz_add_html_font_face(fz_context *ctx, fz_html_font_set *set,
const char *family, int is_bold, int is_italic, int is_small_caps,
const char *src, fz_font *font)
{
fz_html_font_face *custom = fz_malloc_struct(ctx, fz_html_font_face);
fz_try(ctx)
{
custom->font = fz_keep_font(ctx, font);
custom->src = fz_strdup(ctx, src);
custom->family = fz_strdup(ctx, family);
custom->is_bold = is_bold;
custom->is_italic = is_italic;
custom->is_small_caps = is_small_caps;
custom->next = set->custom;
set->custom = custom;
}
fz_catch(ctx)
{
fz_drop_font(ctx, custom->font);
fz_free(ctx, custom->src);
fz_free(ctx, custom->family);
fz_rethrow(ctx);
}
}
fz_font *
fz_load_html_font(fz_context *ctx, fz_html_font_set *set,
const char *family, int is_bold, int is_italic, int is_small_caps)
{
fz_html_font_face *custom;
const unsigned char *data;
int best_score = 0;
fz_font *best_font = NULL;
int size;
for (custom = set->custom; custom; custom = custom->next)
{
if (!strcmp(family, custom->family))
{
int score =
1 * (is_bold == custom->is_bold) +
2 * (is_italic == custom->is_italic) +
4 * (is_small_caps == custom->is_small_caps);
if (score > best_score)
{
best_score = score;
best_font = custom->font;
}
}
}
// We found a perfect match!
if (best_font && best_score == 1 + 2 + 4)
return best_font;
// Try to load a perfect match.
data = fz_lookup_builtin_font(ctx, family, is_bold, is_italic, &size);
if (!data)
data = fz_lookup_builtin_font(ctx, family, 0, 0, &size);
if (data)
{
fz_font *font = fz_new_font_from_memory(ctx, NULL, data, size, 0, 0);
fz_font_flags_t *flags = fz_font_flags(font);
if (is_bold && !flags->is_bold)
flags->fake_bold = 1;
if (is_italic && !flags->is_italic)
flags->fake_italic = 1;
fz_add_html_font_face(ctx, set, family, is_bold, is_italic, 0, "<builtin>", font);
fz_drop_font(ctx, font);
return font;
}
// Use the imperfect match from before.
if (best_font)
return best_font;
// Handle the "default" font aliases.
if (!strcmp(family, "monospace") || !strcmp(family, "sans-serif") || !strcmp(family, "serif"))
return fz_load_html_default_font(ctx, set, family, is_bold, is_italic);
return NULL;
}
fz_html_font_set *fz_new_html_font_set(fz_context *ctx)
{
return fz_malloc_struct(ctx, fz_html_font_set);
}
void fz_drop_html_font_set(fz_context *ctx, fz_html_font_set *set)
{
fz_html_font_face *font, *next;
int i;
if (!set)
return;
font = set->custom;
while (font)
{
next = font->next;
fz_drop_font(ctx, font->font);
fz_free(ctx, font->src);
fz_free(ctx, font->family);
fz_free(ctx, font);
font = next;
}
for (i = 0; i < (int)nelem(set->fonts); ++i)
fz_drop_font(ctx, set->fonts[i]);
fz_free(ctx, set);
}
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