51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
#include <daguerre/psf.hpp>
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namespace daguerre {
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//TODO: this assumes the font is in psf2 format, and has a unicode table
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std::optional<fixed_font<bool>> try_load_psf(FILE *input) {
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uint32_t header[8];
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if (fread(header, 4, 8, input) != 8)
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return {};
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const uint32_t glyphs_start = header[2];
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const uint32_t glyph_count = header[4];
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const uint32_t glyph_length = header[5];
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const uint32_t height = header[6];
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const uint32_t width = header[7];
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fixed_font<bool> font(width, height);
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const uint32_t unicode_start = glyphs_start + glyph_count * glyph_length;
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fseek(input, unicode_start, SEEK_SET);
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uint32_t indices[128];
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for (uint32_t index = 0; index < glyph_count; ++index) {
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uint8_t ch;
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fread(&ch, 1, 1, input);
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if (ch < 128)
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indices[ch] = index;
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do
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if (fread(&ch, 1, 1, input) != 1)
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return {};
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while (ch != 0xff);
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}
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for (uint8_t ch = 0; ch < 128; ++ch) {
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fseek(input, glyphs_start + glyph_length * indices[ch], SEEK_SET);
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for (unsigned h = 0; h < height; ++h)
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for (unsigned wb = 0; wb < width; wb += 8) {
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uint8_t byte;
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fread(&byte, 1, 1, input);
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for (unsigned x = 0; x < 8 && wb + x < width; ++x)
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font.glyphs[ch].at(wb + x, h) = (byte >> (7 - x)) & 1;
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}
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}
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return font;
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}
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}
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