233 lines
8.2 KiB
C++
233 lines
8.2 KiB
C++
#include "bitmap_fonts.hpp"
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namespace bitmap {
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int32_t measure_character(const font_t *font, const char c, const uint8_t scale, unicode_sorta::codepage_t codepage, bool fixed_width) {
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if(c < 32 || c > 127 + 64) { // + 64 char remappings defined in unicode_sorta.hpp
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return 0;
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}
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if(fixed_width) {
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return font->max_width * scale;
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}
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uint8_t char_index = c;
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if(char_index > 127) {
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if(codepage == unicode_sorta::PAGE_195) {
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char_index = unicode_sorta::char_base_195[c - 128];
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} else {
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char_index = unicode_sorta::char_base_194[c - 128 - 32];
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}
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}
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char_index -= 32;
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return font->widths[char_index] * scale;
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}
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int32_t measure_text(const font_t *font, const std::string_view &t, const uint8_t scale, const uint8_t letter_spacing, bool fixed_width) {
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int32_t text_width = 0;
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unicode_sorta::codepage_t codepage = unicode_sorta::PAGE_195;
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for(auto c : t) {
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if(c == unicode_sorta::PAGE_194_START) {
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codepage = unicode_sorta::PAGE_194;
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continue;
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} else if (c == unicode_sorta::PAGE_195_START) {
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continue;
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}
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text_width += measure_character(font, c, scale, codepage, fixed_width);
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text_width += letter_spacing * scale;
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codepage = unicode_sorta::PAGE_195; // Reset back to default
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}
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return text_width;
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}
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void character(const font_t *font, rect_func rectangle, const char c, const int32_t x, const int32_t y, const uint8_t scale, int32_t rotation, unicode_sorta::codepage_t codepage) {
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if(c < 32 || c > 127 + 64) { // + 64 char remappings defined in unicode_sorta.hpp
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return;
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}
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uint8_t char_index = c;
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unicode_sorta::accents char_accent = unicode_sorta::ACCENT_NONE;
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// Remap any chars that fall outside of the 7-bit ASCII range
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// using our unicode fudge lookup table.
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if(char_index > 127) {
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if(codepage == unicode_sorta::PAGE_195) {
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char_index = unicode_sorta::char_base_195[c - 128];
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char_accent = unicode_sorta::char_accent[c - 128];
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} else {
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char_index = unicode_sorta::char_base_194[c - 128 - 32];
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char_accent = unicode_sorta::ACCENT_NONE;
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}
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}
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// We don't map font data for the first 32 non-printable ASCII chars
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char_index -= 32;
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// If our font is taller than 8 pixels it must be two bytes per column
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bool two_bytes_per_column = font->height > 8;
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// Figure out how many bytes we need to skip per char to find our data in the array
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uint8_t bytes_per_char = two_bytes_per_column ? font->max_width * 2 : font->max_width;
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// Get a pointer to the start of the data for this character
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const uint8_t *d = &font->data[char_index * bytes_per_char];
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// Accents can be up to 8 pixels tall on both 8bit and 16bit fonts
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// Each accent's data is font->max_width bytes + 2 offset bytes long
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const uint8_t *a = &font->data[(base_chars + extra_chars) * bytes_per_char + char_accent * (font->max_width + 2)];
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// Effectively shift off the first two bytes of accent data-
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// these are the lower and uppercase accent offsets
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const uint8_t offset_lower = *a++;
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const uint8_t offset_upper = *a++;
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// Pick which offset we should use based on the case of the char
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// This is only valid for A-Z a-z.
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// Note this magic number is relative to the start of printable ASCII chars.
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uint8_t accent_offset = char_index < 65 ? offset_upper : offset_lower;
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// Offset our y position to account for our column canvas being 32 pixels
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// this gives us 8 "pixels" of headroom above the letters for diacritic marks
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int font_offset = (8 * scale);
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// Iterate through each horizontal column of font (and accent) data
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for(uint8_t cx = 0; cx < font->widths[char_index]; cx++) {
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// Our maximum bitmap font height will be 16 pixels
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// give ourselves a 32 pixel high canvas in which to plot the char and accent.
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// We shift the char down 8 pixels to make room for an accent above.
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uint32_t data = *d << 8;
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int32_t o_x = cx * scale;
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// For fonts that are taller than 8 pixels (up to 16) they need two bytes
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if(two_bytes_per_column) {
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d++;
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data <<= 8; // Move down the first byte
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data |= *d << 8; // Add the second byte
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}
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// If the char has an accent, merge it into the column data at its offset
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if(char_accent != unicode_sorta::ACCENT_NONE) {
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data |= *a << accent_offset;
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}
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// Draw the 32 pixel column
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for(uint8_t cy = 0; cy < 32; cy++) {
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if((1U << cy) & data) {
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int32_t o_y = cy * scale;
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int32_t px = 0;
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int32_t py = 0;
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switch (rotation) {
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case 0:
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px = x + o_x;
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py = y - font_offset + o_y;
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break;
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case 90:
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px = x + font_offset - o_y;
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py = y + o_x;
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break;
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case 180:
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px = x - o_x;
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py = y + font_offset - o_y;
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break;
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case 270:
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px = x - font_offset + o_y;
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py = y - o_x;
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break;
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}
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rectangle(px, py, scale, scale);
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}
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}
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// Move to the next columns of char and accent data
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d++;
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a++;
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}
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}
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void text(const font_t *font, rect_func rectangle, const std::string_view &t, const int32_t x, const int32_t y, const int32_t wrap, const uint8_t scale, const uint8_t letter_spacing, bool fixed_width, int32_t rotation) {
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uint32_t char_offset = 0;
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uint32_t line_offset = 0; // line (if wrapping) offset
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unicode_sorta::codepage_t codepage = unicode_sorta::PAGE_195;
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int32_t space_width = measure_character(font, ' ', scale, codepage, fixed_width);
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space_width += letter_spacing * scale;
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size_t i = 0;
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while(i < t.length()) {
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// find length of current word
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size_t next_space = t.find(' ', i + 1);
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if(next_space == std::string::npos) {
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next_space = t.length();
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}
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size_t next_linebreak = t.find('\n', i + 1);
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if(next_linebreak == std::string::npos) {
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next_linebreak = t.length();
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}
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size_t next_break = std::min(next_space, next_linebreak);
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uint16_t word_width = 0;
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for(size_t j = i; j < next_break; j++) {
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if (t[j] == unicode_sorta::PAGE_194_START) {
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codepage = unicode_sorta::PAGE_194;
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continue;
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} else if (t[j] == unicode_sorta::PAGE_195_START) {
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continue;
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}
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word_width += measure_character(font, t[j], scale, codepage, fixed_width);
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word_width += letter_spacing * scale;
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codepage = unicode_sorta::PAGE_195;
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}
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// if this word would exceed the wrap limit then
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// move to the next line
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if(char_offset != 0 && char_offset + word_width > (uint32_t)wrap) {
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char_offset = 0;
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line_offset += (font->height + 1) * scale;
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}
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// draw word
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for(size_t j = i; j < std::min(next_break + 1, t.length()); j++) {
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if (t[j] == unicode_sorta::PAGE_194_START) {
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codepage = unicode_sorta::PAGE_194;
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continue;
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} else if (t[j] == unicode_sorta::PAGE_195_START) {
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continue;
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}
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if (t[j] == '\n') { // Linebreak
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line_offset += (font->height + 1) * scale;
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char_offset = 0;
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} else if (t[j] == ' ') { // Space
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char_offset += space_width;
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} else {
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switch(rotation) {
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case 0:
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character(font, rectangle, t[j], x + char_offset, y + line_offset, scale, rotation, codepage);
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break;
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case 90:
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character(font, rectangle, t[j], x - line_offset, y + char_offset, scale, rotation, codepage);
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break;
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case 180:
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character(font, rectangle, t[j], x - char_offset, y - line_offset, scale, rotation, codepage);
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break;
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case 270:
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character(font, rectangle, t[j], x + line_offset, y - char_offset, scale, rotation, codepage);
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break;
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}
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char_offset += measure_character(font, t[j], scale, codepage, fixed_width);
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char_offset += letter_spacing * scale;
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}
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codepage = unicode_sorta::PAGE_195;
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}
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// move character offset
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i = next_break += 1;
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}
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}
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} |