opensteno_qmk/quantum/painter/qff.c
Nick Brassel 1f2b1dedcc
Quantum Painter (#10174)
* Install dependencies before executing unit tests.

* Split out UTF-8 decoder.

* Fixup python formatting rules.

* Add documentation for QGF/QFF and the RLE format used.

* Add CLI commands for converting images and fonts.

* Add stub rules.mk for QP.

* Add stream type.

* Add base driver and comms interfaces.

* Add support for SPI, SPI+D/C comms drivers.

* Include <qp.h> when enabled.

* Add base support for SPI+D/C+RST panels, as well as concrete implementation of ST7789.

* Add support for GC9A01.

* Add support for ILI9341.

* Add support for ILI9163.

* Add support for SSD1351.

* Implement qp_setpixel, including pixdata buffer management.

* Implement qp_line.

* Implement qp_rect.

* Implement qp_circle.

* Implement qp_ellipse.

* Implement palette interpolation.

* Allow for streams to work with either flash or RAM.

* Image loading.

* Font loading.

* QGF palette loading.

* Progressive decoder of pixel data supporting Raw+RLE, 1-,2-,4-,8-bpp monochrome and palette-based images.

* Image drawing.

* Animations.

* Font rendering.

* Check against 256 colours, dump out the loaded palette if debugging enabled.

* Fix build.

* AVR is not the intended audience.

* `qmk format-c`

* Generation fix.

* First batch of docs.

* More docs and examples.

* Review comments.

* Public API documentation.
2022-04-13 18:00:18 +10:00

137 lines
4.9 KiB
C

// Copyright 2021 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
// Quantum Font File "QFF" File Format.
// See https://docs.qmk.fm/#/quantum_painter_qff for more information.
#include "qff.h"
#include "qp_draw.h"
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// QFF API
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) {
// Seek to the start
qp_stream_setpos(stream, 0);
// Read and validate the font descriptor
qff_font_descriptor_v1_t font_descriptor;
if (qp_stream_read(&font_descriptor, sizeof(qff_font_descriptor_v1_t), 1, stream) != 1) {
qp_dprintf("Failed to read font_descriptor, expected length was not %d\n", (int)sizeof(qff_font_descriptor_v1_t));
return false;
}
// Make sure this block is valid
if (!qgf_validate_block_header(&font_descriptor.header, QFF_FONT_DESCRIPTOR_TYPEID, (sizeof(qff_font_descriptor_v1_t) - sizeof(qgf_block_header_v1_t)))) {
return false;
}
// Make sure the magic and version are correct
if (font_descriptor.magic != QFF_MAGIC || font_descriptor.qff_version != 0x01) {
qp_dprintf("Failed to validate font_descriptor, expected magic 0x%06X was 0x%06X, expected version = 0x%02X was 0x%02X\n", (int)QFF_MAGIC, (int)font_descriptor.magic, (int)0x01, (int)font_descriptor.qff_version);
return false;
}
// Make sure the file length is valid
if (font_descriptor.neg_total_file_size != ~font_descriptor.total_file_size) {
qp_dprintf("Failed to validate font_descriptor, expected negated length 0x%08X was 0x%08X\n", (int)(~font_descriptor.total_file_size), (int)font_descriptor.neg_total_file_size);
return false;
}
// Copy out the required info
if (line_height) {
*line_height = font_descriptor.line_height;
}
if (has_ascii_table) {
*has_ascii_table = font_descriptor.has_ascii_table;
}
if (num_unicode_glyphs) {
*num_unicode_glyphs = font_descriptor.num_unicode_glyphs;
}
if (bpp || has_palette) {
if (!qgf_parse_format(font_descriptor.format, bpp, has_palette)) {
return false;
}
}
if (compression_scheme) {
*compression_scheme = font_descriptor.compression_scheme;
}
if (total_bytes) {
*total_bytes = font_descriptor.total_file_size;
}
return true;
}
static bool qff_validate_ascii_descriptor(qp_stream_t *stream) {
// Read the raw descriptor
qff_ascii_glyph_table_v1_t ascii_descriptor;
if (qp_stream_read(&ascii_descriptor, sizeof(qff_ascii_glyph_table_v1_t), 1, stream) != 1) {
qp_dprintf("Failed to read ascii_descriptor, expected length was not %d\n", (int)sizeof(qff_ascii_glyph_table_v1_t));
return false;
}
// Make sure this block is valid
if (!qgf_validate_block_header(&ascii_descriptor.header, QFF_ASCII_GLYPH_DESCRIPTOR_TYPEID, (sizeof(qff_ascii_glyph_table_v1_t) - sizeof(qgf_block_header_v1_t)))) {
return false;
}
return true;
}
static bool qff_validate_unicode_descriptor(qp_stream_t *stream, uint16_t num_unicode_glyphs) {
// Read the raw descriptor
qff_unicode_glyph_table_v1_t unicode_descriptor;
if (qp_stream_read(&unicode_descriptor, sizeof(qff_unicode_glyph_table_v1_t), 1, stream) != 1) {
qp_dprintf("Failed to read unicode_descriptor, expected length was not %d\n", (int)sizeof(qff_unicode_glyph_table_v1_t));
return false;
}
// Make sure this block is valid
if (!qgf_validate_block_header(&unicode_descriptor.header, QFF_UNICODE_GLYPH_DESCRIPTOR_TYPEID, num_unicode_glyphs * 6)) {
return false;
}
// Skip the necessary amount of data to get to the next block
qp_stream_seek(stream, num_unicode_glyphs * sizeof(qff_unicode_glyph_v1_t), SEEK_CUR);
return true;
}
bool qff_validate_stream(qp_stream_t *stream) {
bool has_ascii_table;
uint16_t num_unicode_glyphs;
if (!qff_read_font_descriptor(stream, NULL, &has_ascii_table, &num_unicode_glyphs, NULL, NULL, NULL, NULL)) {
return false;
}
if (has_ascii_table) {
if (!qff_validate_ascii_descriptor(stream)) {
return false;
}
}
if (num_unicode_glyphs > 0) {
if (!qff_validate_unicode_descriptor(stream, num_unicode_glyphs)) {
return false;
}
}
return true;
}
uint32_t qff_get_total_size(qp_stream_t *stream) {
// Get the original location
uint32_t oldpos = qp_stream_tell(stream);
// Read the font descriptor, grabbing the size
uint32_t total_size;
if (!qff_read_font_descriptor(stream, NULL, NULL, NULL, NULL, NULL, NULL, &total_size)) {
return false;
}
// Restore the original location
qp_stream_setpos(stream, oldpos);
return total_size;
}