Rearrange code and cleanup

src/io/renderer.cc

@@ -0,0 +1,289 @@
+#include "io/ui.h"
+
+uint32_t rows, cols;
+bool show_cursor = 0;
+std::vector<ScreenCell> screen;
+std::vector<ScreenCell> old_screen;
+std::mutex screen_mutex;
+termios orig_termios;
+
+void disable_raw_mode() {
+  std::string os = "\x1b[?1049l\x1b[2 q\x1b[?1002l\x1b[?25h\x1b[?2004l";
+  write(STDOUT_FILENO, os.c_str(), os.size());
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) {
+    perror("tcsetattr");
+    exit(EXIT_FAILURE);
+  }
+}
+
+void enable_raw_mode() {
+  if (tcgetattr(STDIN_FILENO, &orig_termios) == -1)
+    exit(EXIT_FAILURE);
+  atexit(disable_raw_mode);
+  struct termios raw = orig_termios;
+  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+  raw.c_oflag &= ~(OPOST);
+  raw.c_cflag |= (CS8);
+  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+  raw.c_cc[VMIN] = 0;
+  raw.c_cc[VTIME] = 0;
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
+    exit(EXIT_FAILURE);
+  std::string os = "\x1b[?1049h\x1b[2 q\x1b[?1002h\x1b[?25l\x1b[?2004h";
+  write(STDOUT_FILENO, os.c_str(), os.size());
+}
+
+Coord start_screen() {
+  enable_raw_mode();
+  struct winsize w;
+  ioctl(0, TIOCGWINSZ, &w);
+  rows = w.ws_row;
+  cols = w.ws_col;
+  screen.assign(rows * cols, {});
+  old_screen.assign(rows * cols, {});
+  return {rows, cols};
+}
+
+void end_screen() { disable_raw_mode(); }
+
+Coord get_size() { return {rows, cols}; }
+
+void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
+            uint32_t bg, uint8_t flags) {
+  if (row >= rows || col >= cols)
+    return;
+  uint32_t idx = row * cols + col;
+  std::lock_guard<std::mutex> lock(screen_mutex);
+  screen[idx].utf8 = utf8 != "" ? utf8 : "";
+  if (utf8 == "")
+    return;
+  screen[idx].width = display_width(utf8.c_str(), utf8.size());
+  screen[idx].fg = fg;
+  screen[idx].bg = bg;
+  screen[idx].flags = flags;
+  screen[idx].ul_color = 0;
+}
+
+void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
+            uint32_t bg, uint8_t flags) {
+  if (row >= rows || col >= cols)
+    return;
+  uint32_t idx = row * cols + col;
+  std::lock_guard<std::mutex> lock(screen_mutex);
+  screen[idx].utf8 = utf8 ? utf8 : "";
+  if (utf8 == nullptr)
+    return;
+  screen[idx].width = display_width(utf8, strlen(utf8));
+  screen[idx].fg = fg;
+  screen[idx].bg = bg;
+  screen[idx].flags = flags;
+  screen[idx].ul_color = 0;
+}
+
+void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
+            uint32_t bg, uint8_t flags, uint32_t ul_color) {
+  if (row >= rows || col >= cols)
+    return;
+  uint32_t idx = row * cols + col;
+  std::lock_guard<std::mutex> lock(screen_mutex);
+  screen[idx].utf8 = utf8 != "" ? utf8 : "";
+  if (utf8 == "")
+    return;
+  screen[idx].width = display_width(utf8.c_str(), utf8.size());
+  screen[idx].fg = fg;
+  screen[idx].bg = bg;
+  screen[idx].flags = flags;
+  screen[idx].ul_color = ul_color;
+}
+
+void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
+            uint32_t bg, uint8_t flags, uint32_t ul_color) {
+  if (row >= rows || col >= cols)
+    return;
+  uint32_t idx = row * cols + col;
+  std::lock_guard<std::mutex> lock(screen_mutex);
+  screen[idx].utf8 = utf8 ? utf8 : "";
+  if (utf8 == nullptr)
+    return;
+  screen[idx].width = display_width(utf8, strlen(utf8));
+  screen[idx].fg = fg;
+  screen[idx].bg = bg;
+  screen[idx].flags = flags;
+  screen[idx].ul_color = ul_color;
+}
+
+inline bool is_empty_cell(const ScreenCell &c) {
+  return c.utf8.empty() || c.utf8 == " " || c.utf8 == "\x1b";
+}
+
+void render() {
+  static bool first_render = true;
+  uint32_t current_fg = 0;
+  uint32_t current_bg = 0;
+  uint32_t current_ul_color = 0;
+  bool current_italic = false;
+  bool current_bold = false;
+  bool current_underline = false;
+  std::lock_guard<std::mutex> lock(screen_mutex);
+  std::string out;
+  out.reserve(static_cast<size_t>(rows) * static_cast<size_t>(cols) * 4 + 256);
+  out += "\x1b[s\x1b[?25l";
+  if (first_render) {
+    out += "\x1b[2J\x1b[H";
+    first_render = false;
+  }
+  for (uint32_t row = 0; row < rows; ++row) {
+    int first_change_col = -1;
+    int last_change_col = -1;
+    for (uint32_t col = 0; col < cols; ++col) {
+      uint32_t idx = row * cols + col;
+      ScreenCell &old_cell = old_screen[idx];
+      ScreenCell &new_cell = screen[idx];
+      bool content_changed =
+          old_cell.utf8 != new_cell.utf8 || old_cell.fg != new_cell.fg ||
+          old_cell.bg != new_cell.bg || old_cell.flags != new_cell.flags ||
+          old_cell.ul_color != new_cell.ul_color;
+      if (content_changed) {
+        if (first_change_col == -1) {
+          first_change_col = col;
+          if (first_change_col > 0) {
+            for (int back = 1; back <= 3 && first_change_col - back >= 0;
+                 ++back) {
+              ScreenCell &prev_cell =
+                  screen[row * cols + (first_change_col - back)];
+              if (prev_cell.width > 1) {
+                first_change_col -= back;
+                break;
+              }
+            }
+          }
+        }
+        last_change_col = col;
+      }
+    }
+    if (first_change_col == -1)
+      continue;
+    char buf[64];
+    snprintf(buf, sizeof(buf), "\x1b[%d;%dH", row + 1, first_change_col + 1);
+    out.append(buf);
+    for (int col = first_change_col; col <= last_change_col; ++col) {
+      int idx = row * cols + col;
+      ScreenCell &old_cell = old_screen[idx];
+      ScreenCell &new_cell = screen[idx];
+      int width = new_cell.width > 0 ? new_cell.width : 1;
+      bool overlap = false;
+      if (width > 1) {
+        for (int i = 1; i < width; ++i) {
+          int next_col = col + i;
+          if (next_col >= cols)
+            break;
+          const ScreenCell &next = screen[row * cols + next_col];
+          if (!is_empty_cell(next)) {
+            overlap = true;
+            break;
+          }
+        }
+      }
+      if (current_fg != new_cell.fg) {
+        if (new_cell.fg) {
+          char fb[64];
+          snprintf(fb, sizeof(fb), "\x1b[38;2;%d;%d;%dm",
+                   (new_cell.fg >> 16) & 0xFF, (new_cell.fg >> 8) & 0xFF,
+                   (new_cell.fg >> 0) & 0xFF);
+          out.append(fb);
+        } else {
+          out += "\x1b[39m";
+        }
+        current_fg = new_cell.fg;
+      }
+      if (current_bg != new_cell.bg) {
+        if (new_cell.bg) {
+          char bb[64];
+          snprintf(bb, sizeof(bb), "\x1b[48;2;%d;%d;%dm",
+                   (new_cell.bg >> 16) & 0xFF, (new_cell.bg >> 8) & 0xFF,
+                   (new_cell.bg >> 0) & 0xFF);
+          out.append(bb);
+        } else {
+          out += "\x1b[49m";
+        }
+        current_bg = new_cell.bg;
+      }
+      bool italic = (new_cell.flags & CF_ITALIC) != 0;
+      if (italic != current_italic) {
+        out += italic ? "\x1b[3m" : "\x1b[23m";
+        current_italic = italic;
+      }
+      bool bold = (new_cell.flags & CF_BOLD) != 0;
+      if (bold != current_bold) {
+        out += bold ? "\x1b[1m" : "\x1b[22m";
+        current_bold = bold;
+      }
+      bool underline = (new_cell.flags & CF_UNDERLINE) != 0;
+      if (underline) {
+        if (new_cell.ul_color != current_ul_color) {
+          if (new_cell.ul_color) {
+            char ubuf[64];
+            snprintf(ubuf, sizeof(ubuf), "\x1b[58;2;%d;%d;%dm",
+                     (new_cell.ul_color >> 16) & 0xFF,
+                     (new_cell.ul_color >> 8) & 0xFF,
+                     (new_cell.ul_color >> 0) & 0xFF);
+            out.append(ubuf);
+          } else {
+            out += "\x1b[59m";
+          }
+          current_ul_color = new_cell.ul_color;
+        }
+      }
+      if (underline != current_underline) {
+        out += underline ? "\x1b[4m" : "\x1b[24m";
+        current_underline = underline;
+      }
+      if (width > 1 && overlap) {
+        for (int i = 1; i < width; ++i)
+          out.push_back(' ');
+      } else {
+        if (!new_cell.utf8.empty()) {
+          if (new_cell.utf8[0] == '\t')
+            out.append("    ");
+          else if (new_cell.utf8[0] != '\x1b')
+            out.append(new_cell.utf8);
+        } else {
+          out.push_back(' ');
+        }
+      }
+      old_cell.utf8 = new_cell.utf8;
+      old_cell.fg = new_cell.fg;
+      old_cell.bg = new_cell.bg;
+      old_cell.flags = new_cell.flags;
+      old_cell.width = new_cell.width;
+    }
+  }
+  out += "\x1b[0m";
+  out += "\x1b[u";
+  if (show_cursor)
+    out += "\x1b[?25h";
+  const char *ptr = out.data();
+  size_t remaining = out.size();
+  while (remaining > 0) {
+    ssize_t written = write(STDOUT_FILENO, ptr, remaining);
+    if (written == 0) {
+      break;
+    } else if (written == -1) {
+      if (errno == EINTR)
+        continue;
+      exit(EXIT_FAILURE);
+      break;
+    } else {
+      ptr += written;
+      remaining -= written;
+    }
+  }
+}
+
+void set_cursor(int row, int col, int type, bool show_cursor_param) {
+  char buf[32];
+  int n = snprintf(buf, sizeof(buf), "\x1b[%d;%dH\x1b[%d q", row + 1, col + 1,
+                   type);
+  show_cursor = show_cursor_param;
+  write(STDOUT_FILENO, buf, n);
+}