Render from the piece table!

src/gui/Window.cc

@@ -113,7 +113,7 @@ bool Window::create(std::shared_ptr<Buffer> buffer)
     m_programs.text->set_color(1.0, 1.0, 1.0, 1.0);
 
     m_buffer = buffer;
-    m_line = 0;
+    m_start_piece = m_buffer->piece_table->start_descriptor->next;
 
     resize();
 
@@ -223,18 +223,18 @@ void Window::handle_event(SDL_Event & event)
 
 void Window::scroll_down()
 {
-    if (m_line < m_buffer->get_num_lines() - 1)
+    if (m_start_piece->next != m_buffer->piece_table->end_descriptor)
     {
-        m_line++;
+        m_start_piece = m_start_piece->next;
         redraw();
     }
 }
 
 void Window::scroll_up()
 {
-    if (m_line > 0)
+    if (m_start_piece->prev != m_buffer->piece_table->start_descriptor)
     {
-        m_line--;
+        m_start_piece = m_start_piece->prev;
         redraw();
     }
 }
@@ -257,17 +257,14 @@ void Window::redraw()
     int advance = m_font.get_advance();
     int line_height = m_font.get_line_height();
     int y = m_height - line_height;
-    int line_number = 0;
-    for (auto line = m_buffer->cbegin(); line != m_buffer->cend(); line++)
+    for (PieceTable::PieceDescriptor * pd = m_start_piece;
+         pd != m_buffer->piece_table->end_descriptor;
+         pd = pd->next)
     {
-        if (line_number++ < m_line)
-        {
-            continue;
-        }
         int x = 0;
-        for (int i = 0, len = (*line)->size(); i < len; i++)
+        for (int i = 0, len = pd->length; i < len; i++)
         {
-            uint8_t c = (**line)[i];
+            uint8_t c = pd->start[i];
             auto g = m_font.get_glyph(c);
             m_programs.text->set_position(x, y);
             g->render();

src/gui/Window.h

@@ -32,7 +32,7 @@ protected:
 
     std::shared_ptr<Buffer> m_buffer;
 
-    int m_line;
+    PieceTable::PieceDescriptor * m_start_piece;
 };
 
 #endif