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Diffstat (limited to 'quantum/painter/qff.h')
| -rw-r--r-- | quantum/painter/qff.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/quantum/painter/qff.h b/quantum/painter/qff.h new file mode 100644 index 0000000000..6f1a1fd815 --- /dev/null +++ b/quantum/painter/qff.h @@ -0,0 +1,88 @@ +// Copyright 2021 Nick Brassel (@tzarc) +// SPDX-License-Identifier: GPL-2.0-or-later + +#pragma once + +// Quantum Font File "QFF" File Format. +// See https://docs.qmk.fm/#/quantum_painter_qff for more information. + +#include <stdint.h> +#include <stdbool.h> + +#include "qp_stream.h" +#include "qp_internal.h" +#include "qgf.h" + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// QFF structures + +///////////////////////////////////////// +// Font descriptor + +#define QFF_FONT_DESCRIPTOR_TYPEID 0x00 + +typedef struct __attribute__((packed)) qff_font_descriptor_v1_t { + qgf_block_header_v1_t header; // = { .type_id = 0x00, .neg_type_id = (~0x00), .length = 20 } + uint32_t magic : 24; // constant, equal to 0x464651 ("QFF") + uint8_t qff_version; // constant, equal to 0x01 + uint32_t total_file_size; // total size of the entire file, starting at offset zero + uint32_t neg_total_file_size; // negated value of total_file_size, used for detecting parsing errors + uint8_t line_height; // glyph height in pixels + bool has_ascii_table; // whether the font has an ascii table of glyphs (0x20...0x7E) + uint16_t num_unicode_glyphs; // the number of glyphs in the unicode table -- no table specified if zero + qp_image_format_t format : 8; // Frame format, see qp.h. + uint8_t flags; // frame flags, see below. + uint8_t compression_scheme; // compression scheme, see below. + uint8_t transparency_index; // palette index used for transparent pixels (not yet implemented) +} qff_font_descriptor_v1_t; + +_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"); + +#define QFF_MAGIC 0x464651 + +///////////////////////////////////////// +// ASCII glyph table descriptor + +#define QFF_ASCII_GLYPH_DESCRIPTOR_TYPEID 0x01 + +#define QFF_GLYPH_WIDTH_BITS 6 +#define QFF_GLYPH_WIDTH_MASK ((1 << QFF_GLYPH_WIDTH_BITS) - 1) +#define QFF_GLYPH_OFFSET_BITS 18 +#define QFF_GLYPH_OFFSET_MASK (((1 << QFF_GLYPH_OFFSET_BITS) - 1) << QFF_GLYPH_WIDTH_BITS) + +typedef struct __attribute__((packed)) qff_ascii_glyph_v1_t { + uint32_t value : 24; // Uses QFF_GLYPH_*_(BITS|MASK) as bitfield ordering is compiler-defined +} qff_ascii_glyph_v1_t; + +_Static_assert(sizeof(qff_ascii_glyph_v1_t) == 3, "qff_ascii_glyph_v1_t must be 3 bytes in v1 of QFF"); + +typedef struct __attribute__((packed)) qff_ascii_glyph_table_v1_t { + qgf_block_header_v1_t header; // = { .type_id = 0x01, .neg_type_id = (~0x01), .length = 285 } + qff_ascii_glyph_v1_t glyph[95]; // 95 glyphs, 0x20..0x7E +} qff_ascii_glyph_table_v1_t; + +_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"); + +///////////////////////////////////////// +// Unicode glyph table descriptor + +#define QFF_UNICODE_GLYPH_DESCRIPTOR_TYPEID 0x02 + +typedef struct __attribute__((packed)) qff_unicode_glyph_v1_t { + uint32_t code_point : 24; + uint32_t value : 24; // Uses QFF_GLYPH_*_(BITS|MASK) as bitfield ordering is compiler-defined +} qff_unicode_glyph_v1_t; + +_Static_assert(sizeof(qff_unicode_glyph_v1_t) == 6, "qff_unicode_glyph_v1_t must be 6 bytes in v1 of QFF"); + +typedef struct __attribute__((packed)) qff_unicode_glyph_table_v1_t { + qgf_block_header_v1_t header; // = { .type_id = 0x02, .neg_type_id = (~0x02), .length = (N * 6) } + qff_unicode_glyph_v1_t glyph[0]; // Extent of '0' signifies that this struct is immediately followed by the glyph data +} qff_unicode_glyph_table_v1_t; + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// QFF API + +bool qff_validate_stream(qp_stream_t *stream); +uint32_t qff_get_total_size(qp_stream_t *stream); +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); |