88 lines
4.1 KiB
C
88 lines
4.1 KiB
C
// Copyright 2021 Nick Brassel (@tzarc)
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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// Quantum Font File "QFF" File Format.
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// See https://docs.qmk.fm/#/quantum_painter_qff for more information.
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#include <stdint.h>
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#include <stdbool.h>
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#include "qp_stream.h"
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#include "qp_internal.h"
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#include "qgf.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// QFF structures
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/////////////////////////////////////////
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// Font descriptor
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#define QFF_FONT_DESCRIPTOR_TYPEID 0x00
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typedef struct QP_PACKED qff_font_descriptor_v1_t {
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qgf_block_header_v1_t header; // = { .type_id = 0x00, .neg_type_id = (~0x00), .length = 20 }
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uint32_t magic : 24; // constant, equal to 0x464651 ("QFF")
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uint8_t qff_version; // constant, equal to 0x01
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uint32_t total_file_size; // total size of the entire file, starting at offset zero
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uint32_t neg_total_file_size; // negated value of total_file_size, used for detecting parsing errors
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uint8_t line_height; // glyph height in pixels
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bool has_ascii_table; // whether the font has an ascii table of glyphs (0x20...0x7E)
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uint16_t num_unicode_glyphs; // the number of glyphs in the unicode table -- no table specified if zero
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qp_image_format_t format : 8; // Frame format, see qp.h.
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uint8_t flags; // frame flags, see below.
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uint8_t compression_scheme; // compression scheme, see below.
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uint8_t transparency_index; // palette index used for transparent pixels (not yet implemented)
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} qff_font_descriptor_v1_t;
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_Static_assert(sizeof(qff_font_descriptor_v1_t) == (sizeof(qgf_block_header_v1_t) + 20), "qff_font_descriptor_v1_t must be 25 bytes in v1 of QFF");
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#define QFF_MAGIC 0x464651
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/////////////////////////////////////////
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// ASCII glyph table descriptor
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#define QFF_ASCII_GLYPH_DESCRIPTOR_TYPEID 0x01
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#define QFF_GLYPH_WIDTH_BITS 6
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#define QFF_GLYPH_WIDTH_MASK ((1 << QFF_GLYPH_WIDTH_BITS) - 1)
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#define QFF_GLYPH_OFFSET_BITS 18
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#define QFF_GLYPH_OFFSET_MASK (((1 << QFF_GLYPH_OFFSET_BITS) - 1) << QFF_GLYPH_WIDTH_BITS)
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typedef struct QP_PACKED qff_ascii_glyph_v1_t {
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uint32_t value : 24; // Uses QFF_GLYPH_*_(BITS|MASK) as bitfield ordering is compiler-defined
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} qff_ascii_glyph_v1_t;
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_Static_assert(sizeof(qff_ascii_glyph_v1_t) == 3, "qff_ascii_glyph_v1_t must be 3 bytes in v1 of QFF");
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typedef struct QP_PACKED qff_ascii_glyph_table_v1_t {
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qgf_block_header_v1_t header; // = { .type_id = 0x01, .neg_type_id = (~0x01), .length = 285 }
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qff_ascii_glyph_v1_t glyph[95]; // 95 glyphs, 0x20..0x7E
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} qff_ascii_glyph_table_v1_t;
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_Static_assert(sizeof(qff_ascii_glyph_table_v1_t) == (sizeof(qgf_block_header_v1_t) + (95 * sizeof(qff_ascii_glyph_v1_t))), "qff_ascii_glyph_table_v1_t must be 290 bytes in v1 of QFF");
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/////////////////////////////////////////
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// Unicode glyph table descriptor
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#define QFF_UNICODE_GLYPH_DESCRIPTOR_TYPEID 0x02
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typedef struct QP_PACKED qff_unicode_glyph_v1_t {
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uint32_t code_point : 24;
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uint32_t value : 24; // Uses QFF_GLYPH_*_(BITS|MASK) as bitfield ordering is compiler-defined
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} qff_unicode_glyph_v1_t;
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_Static_assert(sizeof(qff_unicode_glyph_v1_t) == 6, "qff_unicode_glyph_v1_t must be 6 bytes in v1 of QFF");
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typedef struct QP_PACKED qff_unicode_glyph_table_v1_t {
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qgf_block_header_v1_t header; // = { .type_id = 0x02, .neg_type_id = (~0x02), .length = (N * 6) }
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qff_unicode_glyph_v1_t glyph[0]; // Extent of '0' signifies that this struct is immediately followed by the glyph data
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} qff_unicode_glyph_table_v1_t;
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// QFF API
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bool qff_validate_stream(qp_stream_t *stream);
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uint32_t qff_get_total_size(qp_stream_t *stream);
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bool qff_read_font_descriptor(qp_stream_t *stream, uint8_t *line_height, bool *has_ascii_table, uint16_t *num_unicode_glyphs, uint8_t *bpp, bool *has_palette, painter_compression_t *compression_scheme, uint32_t *total_bytes);
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