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// Copyright 2021 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
// Quantum Graphics File "QGF" File Format.
// See https://docs.qmk.fm/#/quantum_painter_qgf for more information.
#include <stdint.h>
#include <stdbool.h>
#include "qp_stream.h"
#include "qp_internal.h"
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// QGF structures
/////////////////////////////////////////
// Common block header
typedef struct QP_PACKED qgf_block_header_v1_t {
uint8_t type_id; // See each respective block type below.
uint8_t neg_type_id; // Negated type ID, used for detecting parsing errors.
uint32_t length : 24; // 24-bit blob length, allowing for block sizes of a maximum of 16MB.
} qgf_block_header_v1_t;
_Static_assert(sizeof(qgf_block_header_v1_t) == 5, "qgf_block_header_v1_t must be 5 bytes in v1 of QGF");
/////////////////////////////////////////
// Graphics descriptor
#define QGF_GRAPHICS_DESCRIPTOR_TYPEID 0x00
typedef struct QP_PACKED qgf_graphics_descriptor_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x00, .neg_type_id = (~0x00), .length = 18 }
uint32_t magic : 24; // constant, equal to 0x464751 ("QGF")
uint8_t qgf_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
uint16_t image_width; // in pixels
uint16_t image_height; // in pixels
uint16_t frame_count; // minimum of 1
} qgf_graphics_descriptor_v1_t;
_Static_assert(sizeof(qgf_graphics_descriptor_v1_t) == (sizeof(qgf_block_header_v1_t) + 18), "qgf_graphics_descriptor_v1_t must be 23 bytes in v1 of QGF");
#define QGF_MAGIC 0x464751
/////////////////////////////////////////
// Frame offset descriptor
#define QGF_FRAME_OFFSET_DESCRIPTOR_TYPEID 0x01
typedef struct QP_PACKED qgf_frame_offsets_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x01, .neg_type_id = (~0x01), .length = (N * sizeof(uint32_t)) }
uint32_t offset[0]; // '0' signifies that this struct is immediately followed by the frame offsets
} qgf_frame_offsets_v1_t;
_Static_assert(sizeof(qgf_frame_offsets_v1_t) == sizeof(qgf_block_header_v1_t), "qgf_frame_offsets_v1_t must only contain qgf_block_header_v1_t in v1 of QGF");
/////////////////////////////////////////
// Frame descriptor
#define QGF_FRAME_DESCRIPTOR_TYPEID 0x02
typedef struct QP_PACKED qgf_frame_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x02, .neg_type_id = (~0x02), .length = 6 }
qp_image_format_t format : 8; // Frame format, see qp.h.
uint8_t flags; // Frame flags, see below.
painter_compression_t compression_scheme : 8; // Compression scheme, see qp.h.
uint8_t transparency_index; // palette index used for transparent pixels (not yet implemented)
uint16_t delay; // frame delay time for animations (in units of milliseconds)
} qgf_frame_v1_t;
_Static_assert(sizeof(qgf_frame_v1_t) == (sizeof(qgf_block_header_v1_t) + 6), "qgf_frame_v1_t must be 11 bytes in v1 of QGF");
#define QGF_FRAME_FLAG_DELTA 0x02
#define QGF_FRAME_FLAG_TRANSPARENT 0x01
/////////////////////////////////////////
// Frame palette descriptor
#define QGF_FRAME_PALETTE_DESCRIPTOR_TYPEID 0x03
typedef struct QP_PACKED qgf_palette_entry_v1_t {
uint8_t h; // hue component: `[0,360)` degrees is mapped to `[0,255]` uint8_t.
uint8_t s; // saturation component: `[0,1]` is mapped to `[0,255]` uint8_t.
uint8_t v; // value component: `[0,1]` is mapped to `[0,255]` uint8_t.
} qgf_palette_entry_v1_t;
_Static_assert(sizeof(qgf_palette_entry_v1_t) == 3, "Palette entry is not 3 bytes in size");
typedef struct QP_PACKED qgf_palette_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x03, .neg_type_id = (~0x03), .length = (N * 3 * sizeof(uint8_t)) }
qgf_palette_entry_v1_t hsv[0]; // N * hsv, where N is the number of palette entries depending on the frame format in the descriptor
} qgf_palette_v1_t;
_Static_assert(sizeof(qgf_palette_v1_t) == sizeof(qgf_block_header_v1_t), "qgf_palette_v1_t must only contain qgf_block_header_v1_t in v1 of QGF");
/////////////////////////////////////////
// Frame delta descriptor
#define QGF_FRAME_DELTA_DESCRIPTOR_TYPEID 0x04
typedef struct QP_PACKED qgf_delta_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x04, .neg_type_id = (~0x04), .length = 8 }
uint16_t left; // The left pixel location to draw the delta image
uint16_t top; // The top pixel location to draw the delta image
uint16_t right; // The right pixel location to to draw the delta image
uint16_t bottom; // The bottom pixel location to to draw the delta image
} qgf_delta_v1_t;
_Static_assert(sizeof(qgf_delta_v1_t) == (sizeof(qgf_block_header_v1_t) + 8), "qgf_delta_v1_t must be 13 bytes in v1 of QGF");
/////////////////////////////////////////
// Frame data descriptor
#define QGF_FRAME_DATA_DESCRIPTOR_TYPEID 0x05
typedef struct QP_PACKED qgf_data_v1_t {
qgf_block_header_v1_t header; // = { .type_id = 0x05, .neg_type_id = (~0x05), .length = N }
uint8_t data[0]; // 0 signifies that this struct is immediately followed by the length of data specified in the header
} qgf_data_v1_t;
_Static_assert(sizeof(qgf_data_v1_t) == sizeof(qgf_block_header_v1_t), "qgf_data_v1_t must only contain qgf_block_header_v1_t in v1 of QGF");
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// QGF API
uint32_t qgf_get_total_size(qp_stream_t *stream);
bool qgf_validate_stream(qp_stream_t *stream);
bool qgf_validate_block_header(qgf_block_header_v1_t *desc, uint8_t expected_typeid, int32_t expected_length);
bool qgf_read_graphics_descriptor(qp_stream_t *stream, uint16_t *image_width, uint16_t *image_height, uint16_t *frame_count, uint32_t *total_bytes);
bool qgf_parse_format(qp_image_format_t format, uint8_t *bpp, bool *has_palette);
void qgf_seek_to_frame_descriptor(qp_stream_t *stream, uint16_t frame_number);
bool qgf_parse_frame_descriptor(qgf_frame_v1_t *frame_descriptor, uint8_t *bpp, bool *has_palette, bool *is_delta, painter_compression_t *compression_scheme, uint16_t *delay);
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