diff options
Diffstat (limited to 'quantum/painter/qp_draw_text.c')
| -rw-r--r-- | quantum/painter/qp_draw_text.c | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/quantum/painter/qp_draw_text.c b/quantum/painter/qp_draw_text.c new file mode 100644 index 0000000000..f99e082cad --- /dev/null +++ b/quantum/painter/qp_draw_text.c @@ -0,0 +1,444 @@ +// Copyright 2021 Nick Brassel (@tzarc) +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <quantum.h> +#include <utf8.h> + +#include "qp_internal.h" +#include "qp_draw.h" +#include "qp_comms.h" +#include "qff.h" + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// QFF font handles + +typedef struct qff_font_handle_t { + painter_font_desc_t base; + bool validate_ok; + bool has_ascii_table; + uint16_t num_unicode_glyphs; + uint8_t bpp; + bool has_palette; + painter_compression_t compression_scheme; + union { + qp_stream_t stream; + qp_memory_stream_t mem_stream; +#ifdef QP_STREAM_HAS_FILE_IO + qp_file_stream_t file_stream; +#endif // QP_STREAM_HAS_FILE_IO + }; +#if QUANTUM_PAINTER_LOAD_FONTS_TO_RAM + bool owns_buffer; + void *buffer; +#endif // QUANTUM_PAINTER_LOAD_FONTS_TO_RAM +} qff_font_handle_t; + +static qff_font_handle_t font_descriptors[QUANTUM_PAINTER_NUM_FONTS] = {0}; + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Quantum Painter External API: qp_load_font_mem + +painter_font_handle_t qp_load_font_mem(const void *buffer) { + qp_dprintf("qp_load_font_mem: entry\n"); + qff_font_handle_t *font = NULL; + + // Find a free slot + for (int i = 0; i < QUANTUM_PAINTER_NUM_FONTS; ++i) { + if (!font_descriptors[i].validate_ok) { + font = &font_descriptors[i]; + break; + } + } + + // Drop out if not found + if (!font) { + qp_dprintf("qp_load_font_mem: fail (no free slot)\n"); + return NULL; + } + + // Assume we can read the graphics descriptor + font->mem_stream = qp_make_memory_stream((void *)buffer, sizeof(qff_font_descriptor_v1_t)); + + // Update the length of the stream to match, and rewind to the start + font->mem_stream.length = qff_get_total_size(&font->stream); + font->mem_stream.position = 0; + + // Now that we know the length, validate the input data + if (!qff_validate_stream(&font->stream)) { + qp_dprintf("qp_load_font_mem: fail (failed validation)\n"); + return NULL; + } + +#if QUANTUM_PAINTER_LOAD_FONTS_TO_RAM + // Clear out any existing data + font->owns_buffer = false; + font->buffer = NULL; + + void *ram_buffer = malloc(font->mem_stream.length); + if (ram_buffer == NULL) { + qp_dprintf("qp_load_font_mem: could not allocate enough RAM for font, falling back to original\n"); + } else { + do { + // Copy the data into RAM + if (qp_stream_read(ram_buffer, 1, font->mem_stream.length, &font->mem_stream) != font->mem_stream.length) { + qp_dprintf("qp_load_font_mem: could not copy from flash to RAM, falling back to original\n"); + break; + } + + // Create the new stream with the new buffer + font->buffer = ram_buffer; + font->owns_buffer = true; + font->mem_stream = qp_make_memory_stream(font->buffer, font->mem_stream.length); + } while (0); + } + + // Free the buffer if we were unable to recreate the RAM copy. + if (ram_buffer != NULL && !font->owns_buffer) { + free(ram_buffer); + } +#endif // QUANTUM_PAINTER_LOAD_FONTS_TO_RAM + + // Read the info (parsing already successful above, no need to check return value) + qff_read_font_descriptor(&font->stream, &font->base.line_height, &font->has_ascii_table, &font->num_unicode_glyphs, &font->bpp, &font->has_palette, &font->compression_scheme, NULL); + + if (!qp_internal_bpp_capable(font->bpp)) { + qp_dprintf("qp_load_font_mem: fail (image bpp too high (%d), check QUANTUM_PAINTER_SUPPORTS_256_PALETTE)\n", (int)font->bpp); + qp_close_font((painter_font_handle_t)font); + return NULL; + } + + // Validation success, we can return the handle + font->validate_ok = true; + qp_dprintf("qp_load_font_mem: ok\n"); + return (painter_font_handle_t)font; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Quantum Painter External API: qp_close_font + +bool qp_close_font(painter_font_handle_t font) { + qff_font_handle_t *qff_font = (qff_font_handle_t *)font; + if (!qff_font->validate_ok) { + qp_dprintf("qp_close_font: fail (invalid font)\n"); + return false; + } + +#if QUANTUM_PAINTER_LOAD_FONTS_TO_RAM + // Nuke the buffer, if required + if (qff_font->owns_buffer) { + free(qff_font->buffer); + qff_font->buffer = NULL; + qff_font->owns_buffer = false; + } +#endif // QUANTUM_PAINTER_LOAD_FONTS_TO_RAM + + // Free up this font for use elsewhere. + qff_font->validate_ok = false; + return true; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Helpers + +// Callback to be invoked for each codepoint detected in the UTF8 input string +typedef bool (*code_point_handler)(qff_font_handle_t *qff_font, uint32_t code_point, uint8_t width, uint8_t height, void *cb_arg); + +// Helper that sets up the palette (if required) and returns the offset in the stream that the data starts +static inline bool qp_drawtext_prepare_font_for_render(painter_device_t device, qff_font_handle_t *qff_font, qp_pixel_t fg_hsv888, qp_pixel_t bg_hsv888, uint32_t *data_offset) { + struct painter_driver_t *driver = (struct painter_driver_t *)device; + + // Drop out if we can't actually place the data we read out anywhere + if (!data_offset) { + qp_dprintf("Failed to prepare stream for read, output info buffer unavailable\n"); + return false; + } + + // Work out where we're reading from + uint32_t offset = sizeof(qff_font_descriptor_v1_t); + if (qff_font->has_ascii_table) { + offset += sizeof(qff_ascii_glyph_table_v1_t); + } + if (qff_font->num_unicode_glyphs > 0) { + offset += sizeof(qff_unicode_glyph_table_v1_t) + (qff_font->num_unicode_glyphs * 6); + } + + // Handle palette if needed + const uint16_t palette_entries = 1u << qff_font->bpp; + bool needs_pixconvert = false; + if (qff_font->has_palette) { + // If this font has a palette, we need to read it out and set up the pixel lookup table + qp_stream_setpos(&qff_font->stream, offset); + if (!qp_internal_load_qgf_palette(&qff_font->stream, qff_font->bpp)) { + return false; + } + + // Skip this block, as far as offset calculations go + offset += sizeof(qgf_palette_v1_t) + (palette_entries * 3); + needs_pixconvert = true; + } else { + // Interpolate from fg/bg + int16_t palette_entries = 1 << qff_font->bpp; + needs_pixconvert = qp_internal_interpolate_palette(fg_hsv888, bg_hsv888, palette_entries); + } + + if (needs_pixconvert) { + // Convert the palette to native format + if (!driver->driver_vtable->palette_convert(device, palette_entries, qp_internal_global_pixel_lookup_table)) { + qp_dprintf("qp_drawtext_recolor: fail (could not convert pixels to native)\n"); + qp_comms_stop(device); + return false; + } + } + + *data_offset = offset; + return true; +} + +static inline bool qp_drawtext_prepare_glyph_for_render(qff_font_handle_t *qff_font, uint32_t code_point, uint8_t *width) { + if (code_point >= 0x20 && code_point < 0x7F && qff_font->has_ascii_table) { + // Do ascii table + qff_ascii_glyph_v1_t glyph_info; + uint32_t glyph_info_offset = sizeof(qff_font_descriptor_v1_t) // Skip the font descriptor + + sizeof(qgf_block_header_v1_t) // Skip the ascii table header + + (code_point - 0x20) * sizeof(qff_ascii_glyph_v1_t); // Jump direct to the data offset based on the glyph index + if (qp_stream_setpos(&qff_font->stream, glyph_info_offset) < 0) { + qp_dprintf("Failed to set stream position while reading ascii glyph info\n"); + return false; + } + + if (qp_stream_read(&glyph_info, sizeof(qff_ascii_glyph_v1_t), 1, &qff_font->stream) != 1) { + qp_dprintf("Failed to read glyph info\n"); + return false; + } + + uint8_t glyph_width = (uint8_t)(glyph_info.value & QFF_GLYPH_WIDTH_MASK); + uint32_t glyph_offset = ((glyph_info.value & QFF_GLYPH_OFFSET_MASK) >> QFF_GLYPH_WIDTH_BITS); + uint32_t data_offset = sizeof(qff_font_descriptor_v1_t) // Skip the font descriptor + + sizeof(qff_ascii_glyph_table_v1_t) // Skip the ascii table + + (qff_font->num_unicode_glyphs > 0 ? (sizeof(qff_unicode_glyph_table_v1_t) + (qff_font->num_unicode_glyphs * sizeof(qff_unicode_glyph_v1_t))) : 0) // Skip the unicode table + + (qff_font->has_palette ? (sizeof(qgf_palette_v1_t) + ((1 << qff_font->bpp) * sizeof(qgf_palette_entry_v1_t))) : 0) // Skip the palette + + sizeof(qgf_block_header_v1_t) // Skip the data block header + + glyph_offset; // Jump to the specified glyph offset + + if (qp_stream_setpos(&qff_font->stream, data_offset) < 0) { + qp_dprintf("Failed to set stream position while preparing ascii glyph data\n"); + return false; + } + + *width = glyph_width; + return true; + } else { + // Do unicode table, which may include singular ascii glyphs if full ascii table isn't specified + uint32_t glyph_info_offset = sizeof(qff_font_descriptor_v1_t) // Skip the font descriptor + + (qff_font->has_ascii_table ? sizeof(qff_ascii_glyph_table_v1_t) : 0) // Skip the ascii table + + sizeof(qgf_block_header_v1_t); // Skip the unicode block header + + if (qp_stream_setpos(&qff_font->stream, glyph_info_offset) < 0) { + qp_dprintf("Failed to set stream position while preparing glyph data\n"); + return false; + } + + qff_unicode_glyph_v1_t glyph_info; + for (uint16_t i = 0; i < qff_font->num_unicode_glyphs; ++i) { + if (qp_stream_read(&glyph_info, sizeof(qff_unicode_glyph_v1_t), 1, &qff_font->stream) != 1) { + qp_dprintf("Failed to set stream position while reading unicode glyph info\n"); + return false; + } + + if (glyph_info.code_point == code_point) { + uint8_t glyph_width = (uint8_t)(glyph_info.value & QFF_GLYPH_WIDTH_MASK); + uint32_t glyph_offset = ((glyph_info.value & QFF_GLYPH_OFFSET_MASK) >> QFF_GLYPH_WIDTH_BITS); + uint32_t data_offset = sizeof(qff_font_descriptor_v1_t) // Skip the font descriptor + + sizeof(qff_ascii_glyph_table_v1_t) // Skip the ascii table + + (qff_font->num_unicode_glyphs > 0 ? (sizeof(qff_unicode_glyph_table_v1_t) + (qff_font->num_unicode_glyphs * sizeof(qff_unicode_glyph_v1_t))) : 0) // Skip the unicode table + + (qff_font->has_palette ? (sizeof(qgf_palette_v1_t) + ((1 << qff_font->bpp) * sizeof(qgf_palette_entry_v1_t))) : 0) // Skip the palette + + sizeof(qgf_block_header_v1_t) // Skip the data block header + + glyph_offset; // Jump to the specified glyph offset + + if (qp_stream_setpos(&qff_font->stream, data_offset) < 0) { + qp_dprintf("Failed to set stream position while preparing unicode glyph data\n"); + return false; + } + + *width = glyph_width; + return true; + } + } + + // Not found + qp_dprintf("Failed to find unicode glyph info\n"); + return false; + } + return false; +} + +// Function to iterate over each UTF8 codepoint, invoking the callback for each decoded glyph +static inline bool qp_iterate_code_points(qff_font_handle_t *qff_font, const char *str, code_point_handler handler, void *cb_arg) { + while (*str) { + int32_t code_point = 0; + str = decode_utf8(str, &code_point); + if (code_point < 0) { + qp_dprintf("Invalid unicode code point decoded. Cannot render.\n"); + return false; + } + + uint8_t width; + if (!qp_drawtext_prepare_glyph_for_render(qff_font, code_point, &width)) { + qp_dprintf("Failed to prepare glyph for rendering.\n"); + return false; + } + + if (!handler(qff_font, code_point, width, qff_font->base.line_height, cb_arg)) { + qp_dprintf("Failed to execute glyph handler.\n"); + return false; + } + } + return true; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// String width calculation + +// Callback state +struct code_point_iter_calcwidth_state { + int16_t width; +}; + +// Codepoint handler callback: width calc +static inline bool qp_font_code_point_handler_calcwidth(qff_font_handle_t *qff_font, uint32_t code_point, uint8_t width, uint8_t height, void *cb_arg) { + struct code_point_iter_calcwidth_state *state = (struct code_point_iter_calcwidth_state *)cb_arg; + + // Increment the overall width by this glyph's width + state->width += width; + + return true; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// String drawing implementation + +// Callback state +struct code_point_iter_drawglyph_state { + painter_device_t device; + int16_t xpos; + int16_t ypos; + qp_internal_byte_input_callback input_callback; + struct qp_internal_byte_input_state * input_state; + struct qp_internal_pixel_output_state *output_state; +}; + +// Codepoint handler callback: drawing +static inline bool qp_font_code_point_handler_drawglyph(qff_font_handle_t *qff_font, uint32_t code_point, uint8_t width, uint8_t height, void *cb_arg) { + struct code_point_iter_drawglyph_state *state = (struct code_point_iter_drawglyph_state *)cb_arg; + struct painter_driver_t * driver = (struct painter_driver_t *)state->device; + + // Reset the input state's RLE mode -- the stream should already be correctly positioned by qp_iterate_code_points() + state->input_state->rle.mode = MARKER_BYTE; // ignored if not using RLE + + // Reset the output state + state->output_state->pixel_write_pos = 0; + + // Configure where we're going to be rendering to + driver->driver_vtable->viewport(state->device, state->xpos, state->ypos, state->xpos + width - 1, state->ypos + height - 1); + + // Move the x-position for the next glyph + state->xpos += width; + + // Decode the pixel data for the glyph + uint32_t pixel_count = ((uint32_t)width) * height; + bool ret = qp_internal_decode_palette(state->device, pixel_count, qff_font->bpp, state->input_callback, state->input_state, qp_internal_global_pixel_lookup_table, qp_internal_pixel_appender, state->output_state); + + // Any leftovers need transmission as well. + if (ret && state->output_state->pixel_write_pos > 0) { + ret &= driver->driver_vtable->pixdata(state->device, qp_internal_global_pixdata_buffer, state->output_state->pixel_write_pos); + } + + return ret; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Quantum Painter External API: qp_textwidth + +int16_t qp_textwidth(painter_font_handle_t font, const char *str) { + qff_font_handle_t *qff_font = (qff_font_handle_t *)font; + if (!qff_font->validate_ok) { + qp_dprintf("qp_textwidth: fail (invalid font)\n"); + return false; + } + + // Create the codepoint iterator state + struct code_point_iter_calcwidth_state state = {.width = 0}; + // Iterate each codepoint, return the calculated width if successful. + return qp_iterate_code_points(qff_font, str, qp_font_code_point_handler_calcwidth, &state) ? state.width : 0; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Quantum Painter External API: qp_drawtext + +int16_t qp_drawtext(painter_device_t device, uint16_t x, uint16_t y, painter_font_handle_t font, const char *str) { + // Offload to the recolor variant, substituting fg=white bg=black. + // Traditional LCDs with those colors will need to manually invoke qp_drawtext_recolor with the colors reversed. + return qp_drawtext_recolor(device, x, y, font, str, 0, 0, 255, 0, 0, 0); +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Quantum Painter External API: qp_drawtext_recolor + +int16_t qp_drawtext_recolor(painter_device_t device, uint16_t x, uint16_t y, painter_font_handle_t font, const char *str, uint8_t hue_fg, uint8_t sat_fg, uint8_t val_fg, uint8_t hue_bg, uint8_t sat_bg, uint8_t val_bg) { + qp_dprintf("qp_drawtext_recolor: entry\n"); + struct painter_driver_t *driver = (struct painter_driver_t *)device; + if (!driver->validate_ok) { + qp_dprintf("qp_drawtext_recolor: fail (validation_ok == false)\n"); + return 0; + } + + qff_font_handle_t *qff_font = (qff_font_handle_t *)font; + if (!qff_font->validate_ok) { + qp_dprintf("qp_drawtext_recolor: fail (invalid font)\n"); + return false; + } + + if (!qp_comms_start(device)) { + qp_dprintf("qp_drawtext_recolor: fail (could not start comms)\n"); + return 0; + } + + // Set up the byte input state and input callback + struct qp_internal_byte_input_state input_state = {.device = device, .src_stream = &qff_font->stream}; + qp_internal_byte_input_callback input_callback = qp_internal_prepare_input_state(&input_state, qff_font->compression_scheme); + if (input_callback == NULL) { + qp_dprintf("qp_drawtext_recolor: fail (invalid font compression scheme)\n"); + qp_comms_stop(device); + return false; + } + + // Set up the pixel output state + struct qp_internal_pixel_output_state output_state = {.device = device, .pixel_write_pos = 0, .max_pixels = qp_internal_num_pixels_in_buffer(device)}; + + // Set up the codepoint iteration state + struct code_point_iter_drawglyph_state state = {// Common + .device = device, + .xpos = x, + .ypos = y, + // Input + .input_callback = input_callback, + .input_state = &input_state, + // Output + .output_state = &output_state}; + + qp_pixel_t fg_hsv888 = {.hsv888 = {.h = hue_fg, .s = sat_fg, .v = val_fg}}; + qp_pixel_t bg_hsv888 = {.hsv888 = {.h = hue_bg, .s = sat_bg, .v = val_bg}}; + uint32_t data_offset; + if (!qp_drawtext_prepare_font_for_render(driver, qff_font, fg_hsv888, bg_hsv888, &data_offset)) { + qp_dprintf("qp_drawtext_recolor: fail (failed to prepare font for rendering)\n"); + qp_comms_stop(device); + return false; + } + + // Iterate the codepoints with the drawglyph callback + bool ret = qp_iterate_code_points(qff_font, str, qp_font_code_point_handler_drawglyph, &state); + + qp_dprintf("qp_drawtext_recolor: %s\n", ret ? "ok" : "fail"); + qp_comms_stop(device); + return ret ? (state.xpos - x) : 0; +} |