94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
#pragma once
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#include <efi.h>
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#include <common.h>
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#include "ttf_math.h"
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typedef struct ttf_face ttf_face_t;
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typedef struct ttf_face {
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const SUINT8* data;
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UINTN size;
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// head
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SUINT32 units_per_em;
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SSINT16 index_to_loc_format; // 0 = short, 1 = long
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// hhea
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SSINT16 hhea_ascender;
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SSINT16 hhea_descender;
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SSINT16 hhea_line_gap;
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SUINT16 num_long_hor_metrics;
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// maxp
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SUINT16 num_glyphs;
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SUINT16 max_points;
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SUINT16 max_contours;
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// os/2
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SSINT16 os2_ascender;
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SSINT16 os2_descender;
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SSINT16 os2_line_gap;
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// Table directory (sorted by tag at open time)
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struct {
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char tag[4];
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SUINT32 offset;
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SUINT32 length;
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} tables[32];
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SUINT16 num_tables;
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// Cached pointers into data[]
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const SUINT8* loca; // size depends on num_glyphs and format
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const SUINT8* glyf;
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SUINT32 glyf_len;
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const SUINT8* hmtx;
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SUINT32 hmtx_len;
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const SUINT8* cmap;
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} ttf_face_t;
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// Decomposed glyph: contours in pixel space (26.6 fp) ready to scan.
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typedef struct ttf_outline {
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f26_6 x[1024];
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f26_6 y[1024];
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SUINT8 on_curve[1024];
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SUINT16 first[64];
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SUINT16 last[64];
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SUINT16 num_contours;
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SUINT16 num_points;
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// Bounding box in pixel space (26.6 fp).
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SSINT32 xmin, ymin, xmax, ymax;
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// Pen advance in pixel space (26.6 fp).
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f26_6 advance;
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} ttf_outline_t;
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typedef struct ttf_seg {
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f26_6 x0, y0, x1, y1; // line / quad end points
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f26_6 cx, cy; // quadratic control (set to x0/y0 if is_line)
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SUINT8 is_line; // 1 = line, 0 = quad
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} ttf_seg_t;
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// Parse the glyf entry for glyph_id. Fills outline already
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// scaled to pixel_size_px. Returns false on composite / parse error.
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bool ttf_load_glyph(ttf_face_t* face, SUINT16 glyph_id,
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SUINT32 pixel_size_px, ttf_outline_t* out);
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// UTF-8 decoder. *p advances past the codepoint. Returns -1 on error.
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SSINT32 ttf_utf8_decode(const char** p);
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// cmap lookup — returns glyph_id (0 = notdef).
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SUINT16 ttf_cmap_lookup(ttf_face_t* face, SSINT32 cp);
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// Decompose outline into a flat array of line/quadratic segments.
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// out must have room for 2*num_points + num_contours entries.
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void ttf_outline_to_segments(const ttf_outline_t* outline,
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ttf_seg_t* segs, SUINT32* num_segs);
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// Scanline rasterize segments into per-pixel coverage.
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// coverage[w*h] gets values in [0, N] where N = supersample count.
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void ttf_rasterize(const ttf_seg_t* segs, SUINT32 num_segs,
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SSINT32 x0, SSINT32 y0, SUINT32 w, SUINT32 h,
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SUINT8* coverage, SUINT32 N);
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