mirror of
https://git.code.sf.net/p/quake/quakeforge
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c5099d30b1
QFS_LoadFile closes its file argument (this is a design error resulting from changing QFS_LoadFile to take a file instead of a path and not completing the update), resulting in the call to Qfilesize accessing freed memory.
130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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r_font.c
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Renderer font management management
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Copyright (C) 2022 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2022/8/26
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <math.h>
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#include "QF/quakefs.h"
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#include "QF/sys.h"
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#include "QF/math/bitop.h"
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#include "r_font.h"
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#include "compat.h"
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static FT_Library ft;
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static void
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copy_glyph (rglyph_t *glyph, FT_GlyphSlot src_glyph)
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{
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int dst_pitch = glyph->font->scrap.width;
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byte *dst = glyph->font->scrap_bitmap + glyph->rect->x + glyph->rect->y * dst_pitch;
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int src_pitch = src_glyph->bitmap.pitch;
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byte *src = src_glyph->bitmap.buffer;
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for (unsigned i = 0; i < src_glyph->bitmap.rows; i++) {
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memcpy (dst, src, src_glyph->bitmap.width);
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dst += dst_pitch;
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src += src_pitch;
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}
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}
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VISIBLE void
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R_FontInit (void)
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{
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if (FT_Init_FreeType (&ft)) {
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Sys_Error ("Could not init FreeType library");
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}
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}
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VISIBLE void
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R_FontFree (rfont_t *font)
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{
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if (font->face) {
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FT_Done_Face (font->face);
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}
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if (font->scrap.rects || font->scrap.free_rects) {
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R_ScrapDelete (&font->scrap);
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}
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free (font->glyphs);
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free (font->scrap_bitmap);
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free (font->font_resource);
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free (font);
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}
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VISIBLE rfont_t *
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R_FontLoad (QFile *font_file, int size)
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{
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byte *font_data = QFS_LoadFile (font_file, 0);
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if (!font_data) {
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return 0;
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}
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size_t font_size = qfs_filesize;
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rfont_t *font = calloc (1, sizeof (rfont_t));
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font->font_resource = font_data;
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if (FT_New_Memory_Face (ft, font_data, font_size, 0, &font->face)) {
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R_FontFree (font);
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return 0;
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}
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FT_Set_Pixel_Sizes(font->face, 0, size);
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int pixels = 0;
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for (FT_Long gind = 0; gind < font->face->num_glyphs; gind++) {
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FT_Load_Glyph (font->face, gind, FT_LOAD_DEFAULT);
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__auto_type g = font->face->glyph;
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pixels += g->bitmap.width * g->bitmap.rows;
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}
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pixels = sqrt (2 * pixels);
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pixels = BITOP_RUP (pixels);
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R_ScrapInit (&font->scrap, pixels, pixels);
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font->scrap_bitmap = calloc (1, pixels * pixels);
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font->num_glyphs = font->face->num_glyphs;
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font->glyphs = malloc (font->num_glyphs * sizeof (rglyph_t));
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for (FT_Long gind = 0; gind < font->face->num_glyphs; gind++) {
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rglyph_t *glyph = &font->glyphs[gind];
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FT_Load_Glyph (font->face, gind, FT_LOAD_DEFAULT);
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__auto_type slot = font->face->glyph;
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FT_Render_Glyph (slot, FT_RENDER_MODE_NORMAL);
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int width = slot->bitmap.width;
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int height = slot->bitmap.rows;
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glyph->font = font;
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glyph->rect = R_ScrapAlloc (&font->scrap, width, height);
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glyph->bearing = (vec2i_t) { slot->bitmap_left, slot->bitmap_top };
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glyph->advance = slot->advance.x;
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glyph->charcode = gind;
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copy_glyph (glyph, slot);
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}
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return font;
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}
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