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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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18
sys/teton/framebuffer/framebuffer.cpp
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@ -1,6 +1,7 @@
#include "framebuffer/framebuffer.h"
Framebuffer::Framebuffer(const FramebufferInfo& info) : fb_info_(info) {
Framebuffer::Framebuffer(const FramebufferInfo& info)
: fb_info_(info), cursor_pos_(0) {
uint64_t buff_size_bytes = fb_info_.height() * fb_info_.pitch();
fb_memory_ = OwnedMemoryRegion::DirectPhysical(fb_info_.address_phys(),
buff_size_bytes);
@ -11,3 +12,18 @@ void Framebuffer::DrawPixel(uint32_t row, uint32_t col, uint32_t pixel) {
// Div by 4 because pitch is in bytes and fb_ is a 32bit array.
fb_[(row * fb_info_.pitch() / 4) + col] = pixel;
}
void Framebuffer::DrawGlyph(uint8_t* glyph) {
uint32_t gl_width = 8;
uint32_t gl_height = 16;
for (uint8_t r = 0; r < gl_height; r++) {
for (uint8_t c = 0; c < gl_width; c++) {
if (((glyph[r] >> c) % 2) == 1) {
DrawPixel(r, gl_width - c - 1, 0xFFFF'FFFF);
} else {
DrawPixel(r, gl_width - c - 1, 0);
}
}
}
};