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[Mammoth/Teton] Add an OpenFile interface and use it to load a font.

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This commit is contained in:
Drew Galbraith 2023-11-22 16:42:42 -08:00
parent 4fd17a59ea
commit 86ce0a68a3
6 changed files with 84 additions and 21 deletions
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9
sys/teton/framebuffer/psf.h
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@ -1,6 +1,6 @@
#pragma once
#include <mammoth/util/memory_region.h>
#include <mammoth/file/file.h>
struct PsfHeader {
uint32_t magic; /* magic bytes to identify PSF */
@ -15,7 +15,7 @@ struct PsfHeader {
class Psf {
public:
Psf(mmth::OwnedMemoryRegion&& psf_file);
Psf(glcr::StringView path);
void DumpHeader();
@ -24,12 +24,13 @@ class Psf {
uint32_t height() { return header_->height; }
uint8_t* glyph(uint32_t index) {
return reinterpret_cast<uint8_t*>(psf_file_.vaddr() + header_->headersize +
return reinterpret_cast<uint8_t*>(psf_file_.byte_ptr() +
header_->headersize +
(index * header_->bytesperglyph));
}
private:
mmth::OwnedMemoryRegion psf_file_;
mmth::File psf_file_;
PsfHeader* header_;
void EnsureValid();