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[Teton] Load a font file and write a character to the screen.

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This commit is contained in:
Drew Galbraith 2023-11-21 19:14:02 -08:00
parent 96063126cb
commit fe44804dd9
19 changed files with 412 additions and 17 deletions
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46
sys/teton/framebuffer/psf.cpp Normal file
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#include "framebuffer/psf.h"
#include <glacier/memory/move.h>
#include <mammoth/debug.h>
namespace {
const uint32_t kMagic = 0x864AB572;
}
Psf::Psf(OwnedMemoryRegion&& psf_file)
: psf_file_(glcr::Move(psf_file)),
header_(reinterpret_cast<PsfHeader*>(psf_file_.vaddr())) {
EnsureValid();
}
void Psf::DumpHeader() {
dbgln("Magic: {x}", header_->magic);
dbgln("Version: {x}", header_->version);
dbgln("Header Sz: {x}", header_->headersize);
dbgln("Flags: {x}", header_->flags);
dbgln("Length: {x}", header_->numglyph);
dbgln("Glyph Size: {x}", header_->bytesperglyph);
dbgln("Height: {x}", header_->height);
dbgln("Width: {x}", header_->width);
}
void Psf::EnsureValid() {
if (header_->magic != kMagic) {
dbgln("PSF: Magic value: {x}", header_->magic);
crash("PSF: Invalid magic value", glcr::INVALID_ARGUMENT);
}
if (header_->version != 0) {
crash("PSF non-zero version", glcr::INVALID_ARGUMENT);
}
if (header_->height != 0x10) {
crash("PSF height other than 16 not handled", glcr::UNIMPLEMENTED);
}
if (header_->width != 0x8) {
crash("PSF width other than 8 not handled", glcr::UNIMPLEMENTED);
}
}