font_wip branch: new WIP font stuff using "stb_truetype.h",

not implemented for EAN/UPC, not fully tested
2026-07-31 10:29:52 +00:00 · 2026-07-27 12:21:19 +01:00
parent d6a4bdfe90
commit a4f0fa0fd2
144 changed files with 8276 additions and 1567 deletions
@@ -0,0 +1,121 @@
+/* zfont.h - handle fonts */
+/*
+    libzint - the open source barcode library
+    Copyright (C) 2026 Robin Stuart <rstuart114@gmail.com>
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+    3. Neither the name of the project nor the names of its contributors
+       may be used to endorse or promote products derived from this software
+       without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+    SUCH DAMAGE.
+ */
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#ifndef Z_FONT_H
+#define Z_FONT_H
+
+#define ZFONT_MAX_CHARS ((int) sizeof(((struct zint_symbol *)0)->text))
+#define ZFONT_MAX_LINES ZFONT_MAX_CHARS
+
+/* NOTE: ZFONT_HALIGN_XXX be same as vector_string->halign */
+#define ZFONT_HALIGN_CENTRE 0
+#define ZFONT_HALIGN_LEFT   1
+#define ZFONT_HALIGN_RIGHT  2
+#define ZFONT_UPCEAN_TEXT   4   /* Helper flag to indicate dealing with EAN/UPC */
+#define ZFONT_UPCO_TEXT     8
+
+#define STBTT_STATIC
+#include "stb_truetype_zint.h"
+
+struct zfont_patch_info;
+
+struct zfont {
+    stbtt_fontinfo info;
+
+    /* Raster patching */
+    const unsigned char *patch_info_idxs;
+    const struct zfont_patch_info *patch_infos;
+    const unsigned char *patches;
+    const char *bases;
+    int patch_info_idxs_size;
+
+    const struct zfont_patch_info *upco_patch_infos;
+    const unsigned char *upco_patches;
+
+    int upceanflag;
+    int grayscale;
+
+    float scale; /* stb scale */
+    float upco_scale; /* stb scale for UPC-E/A outside digits */
+
+    int font_height;
+    int upco_font_height; /* UPC-E/A outside digits font size */
+    float ascent;
+    float descent_adj;
+    float line_gap;
+    float text_height;
+
+    /* Note using "ascender" to mean height above digits as "ascent" usually measured from baseline */
+    float digit_ascender;
+    float text_gap_antialias;
+    float antialias_fudge;
+
+    float hadvances[ZFONT_MAX_CHARS]; /* Horizontal advances */
+    float line_widths[ZFONT_MAX_LINES];
+    float max_line_width;
+    unsigned char line_idxs[ZFONT_MAX_LINES + 1]; /* Line indices into `symbol->text`; last extra index is length */
+    unsigned char iso_line_idxs[ZFONT_MAX_LINES + 1]; /* Line indices into `iso_text`; last extra index is length */
+    int lines; /* Number of lines */
+    int line_advance; /* Size (height) of each line */
+
+    unsigned char iso_text[ZFONT_MAX_CHARS]; /* `symbol->text` converted to ISO/IEC 8859-1 */
+    int iso_len; /* Length of `iso_text[]` */
+
+    int glyphs[256]; /* Font glyphs (confined to ISO/IEC 8859-1, i.e. <= 0xFF) */
+    unsigned char *bitmaps[256]; /* Rendered bitmaps per glyph */
+    int bitmap_dims[256][4]; /* { width, height, `xMin`, `yMin` } */
+    int space_glyph;
+    int first_ch, last_ch; /* First/last bitmap character used */
+
+    /* UPC-E/A outside stuff */
+    int upco_glyphs[10]; /* Digits only */
+    unsigned char *upco_bitmaps[10]; /* Rendered bitmaps per UPC-E/A outside glyph */
+    int upco_bitmap_dims[10][4]; /* { width, height, `xMin`, `yMin` } */
+};
+
+/* Initialize a font */
+INTERNAL int zint_font_init(struct zfont *zfnt, struct zint_symbol *symbol, const int upceanflag);
+
+/* Free any resources */
+INTERNAL void zint_font_free(struct zfont *zfnt, const int si);
+
+/* Calculate various font metrics, and set total height of text in `zfnt->text_height` */
+INTERNAL int zint_font_text_height(struct zfont *zfnt, struct zint_symbol *symbol, const int si,
+                const float max_width, const unsigned char addon[6], const int addon_len);
+
+/* Raster rendering */
+INTERNAL void zint_font_text_render(struct zfont *zfnt, struct zint_symbol *symbol, unsigned char *pixelbuf,
+                const int line, const int main_width, const int xoffset, const int roffset, const int yposn,
+                const int textflags, const int image_width, const int image_height, const int si);
+
+/* vim: set ts=4 sw=4 et : */
+#endif /* Z_FONT_H */