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72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#include "kutil/assert.h"
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#include "font.h"
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/* PSF2 header format
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* Taken from the Linux KBD documentation
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* http://www.win.tue.nl/~aeb/linux/kbd/font-formats-1.html
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*/
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const static uint8_t magic[] = {0x72, 0xb5, 0x4a, 0x86};
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const static uint32_t max_version = 0;
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const static uint8_t unicode_sep = 0xff;
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const static uint8_t unicode_start = 0xfe;
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/* bits used in flags */
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enum psf2_flags {
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psf2_has_unicode = 0x00000001
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};
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struct psf2_header {
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uint8_t magic[4];
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uint32_t version;
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uint32_t header_size; // offset of bitmaps in file
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uint32_t flags;
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uint32_t length; // number of glyphs
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uint32_t charsize; // number of bytes for each character
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uint32_t height, width; // max dimensions of glyphs
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};
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font::font(void const *data) :
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m_size(0, 0),
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m_count(0),
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m_data(nullptr)
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{
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psf2_header const *psf2 = static_cast<psf2_header const *>(data);
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for (int i = 0; i < sizeof(magic); ++i) {
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kassert(psf2->magic[i] == magic[i], "Bad font magic number.");
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}
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m_data = static_cast<uint8_t const *>(data) + psf2->header_size;
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m_size.x = psf2->width;
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m_size.y = psf2->height;
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m_count = psf2->length;
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}
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void
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font::draw_glyph(
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screen *s,
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uint32_t glyph,
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screen::pixel_t fg,
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screen::pixel_t bg,
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unsigned x,
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unsigned y) const
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{
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unsigned bwidth = (m_size.x+7)/8;
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uint8_t const *data = m_data + (glyph * glyph_bytes());
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for (int dy = 0; dy < m_size.y; ++dy) {
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for (int dx = 0; dx < bwidth; ++dx) {
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uint8_t byte = data[dy * bwidth + dx];
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for (int i = 0; i < 8; ++i) {
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if (dx*8 + i >= m_size.x) continue;
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const uint8_t mask = 1 << (7-i);
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uint32_t c = (byte & mask) ? fg : bg;
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s->draw_pixel(x + dx*8 + i, y + dy, c);
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}
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}
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}
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}
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