FbTty: clear lines

src/kernel/FbTty.cpp

@@ -10,19 +10,33 @@
 FbTty::FbTty(Framebuffer *fb) : _fb(fb) {
     _max_col = _fb->dimensions().x / 8;
     _max_row = _fb->dimensions().y / 16;
+    _buf.resize(_max_col);
+    for (auto &b: _buf) {
+        b.resize(_max_row);
+        for (int i = 0; i < _max_row; i++)
+            b[i] = ' ';
+    }
 }
+
+void FbTty::draw_char(int col, int row) {
+    for (int x = 0; x < 8; x++) {
+        for (int y = 0; y < 16; y++) {
+            uint32_t color = (fonts_Terminess_Powerline[_buf[col][row]][y] & (1 << (8 - x))) ? 0xFFFFFF : 0;
+            _fb->set(col * 8 + x, row * 16 + y, color);
+        }
+    }
+}
+
 void FbTty::putchar(char c) {
     if (c == '\n') {
         next_row();
         return;
     }
 
-    for (int x = 0; x < 8; x++) {
-        for (int y = 0; y < 16; y++) {
-            uint32_t color = (fonts_Terminess_Powerline[c][y] & (1 << (8 - x))) ? 0xFFFFFF : 0;
-            _fb->set(_cur_col * 8 + x, _cur_row * 16 + y, color);
-        }
-    }
+    _buf[_cur_col][_cur_row] = c;
+
+    draw_char(_cur_col, _cur_row);
+
     next_col();
 }
 void FbTty::putstr(const char *str) {
@@ -40,10 +54,19 @@ char FbTty::readchar() {
 void FbTty::next_col() {
     _cur_col++;
     _cur_col = _cur_col % _max_col;
-    if (_cur_col == 0) next_row();
+    if (_cur_col == 0) {
+        next_row();
+    } else {
+        _buf[_cur_col][_cur_row] = ' ';
+        draw_char(_cur_col, _cur_row);
+    }
 }
 void FbTty::next_row() {
     _cur_col = 0;
     _cur_row++;
     _cur_row = _cur_row % _max_row;
+    for (int i = 0; i < _max_col; i++) {
+        _buf[i][_cur_row] = ' ';
+        draw_char(i, _cur_row);
+    }
 }

src/kernel/FbTty.hpp

@@ -4,14 +4,15 @@
 
 #ifndef FBTTY_HPP
 #define FBTTY_HPP
+
 #include <PS2Keyboard.hpp>
 #include <Tty.hpp>
-
+#include <Vector.hpp>
 
 class Framebuffer;
 class FbTty : public Tty {
 public:
-    FbTty(Framebuffer *fb);
+             FbTty(Framebuffer *fb);
     virtual ~FbTty() = default;
 
     void putchar(char c) override;
@@ -19,6 +20,8 @@ public:
     char readchar() override;
 
 private:
+    void draw_char(int col, int row);
+
     Framebuffer *_fb;
 
     int _cur_col = 0;
@@ -27,6 +30,8 @@ private:
     int _max_row = 0;
     int _max_col = 0;
 
+    Vector<Vector<char>> _buf;
+
     void next_col();
     void next_row();
 

src/kernel/templates/Vector.hpp

@@ -1,6 +1,7 @@
 #ifndef VECTOR_H
 #define VECTOR_H
 
+#include <memory>
 #include <new>
 #include <utility>
 
@@ -146,6 +147,34 @@ public:
         return out;
     }
 
+    void resize(size_t size) {
+        if (size == _cur_size) return;
+
+        if (size < _cur_size) {
+            for (int i = size; i < _cur_size; i++) {
+                if constexpr (!std::is_trivially_destructible<T>::value)
+                    std::destroy_at(_data + i);
+            }
+            _cur_size = size;
+            compact();
+            return;
+        }
+
+        if (size > _cur_size) {
+            if (_capacity < size) {
+                _capacity = size;
+                _data     = (T *) krealloc(reinterpret_cast<char *>(_data), _capacity * sizeof(T));
+            }
+            for (int i = _cur_size; i < size; i++) {
+                if constexpr (!std::is_trivially_constructible<T>::value)
+                    new (_data + i) T();
+                else
+                    memset((char *) (_data + i), 0, sizeof(T));
+            }
+            _cur_size = size;
+        }
+    }
+
     T       *data() { return _data; }
     const T *data() const { return _data; }