From 690786504fce73edea78c7ec13b34771771e4caf Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Wed, 21 Dec 2022 15:29:21 +0100
Subject: wip render rework

---
 src/display.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 132 insertions(+), 16 deletions(-)

(limited to 'src/display.c')

diff --git a/src/display.c b/src/display.c
index b382ea1..94b1c36 100644
--- a/src/display.c
+++ b/src/display.c
@@ -3,6 +3,7 @@
 
 #include "buffer.h"
 
+#include <stdarg.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
@@ -47,7 +48,15 @@ void display_destroy(struct display *display) {
 }
 
 void putbytes(uint8_t *line_bytes, uint32_t line_length) {
-  fwrite(line_bytes, 1, line_length, stdout);
+  for (uint32_t bytei = 0; bytei < line_length; ++bytei) {
+    uint8_t byte = line_bytes[bytei];
+
+    if (byte == '\t') {
+      fputs("    ", stdout);
+    } else {
+      fputc(byte, stdout);
+    }
+  }
 }
 
 void putbyte(uint8_t c) { putc(c, stdout); }
@@ -84,23 +93,130 @@ void delete_to_eol() {
   putbytes(bytes, 3);
 }
 
-void display_update(struct display *display, struct render_cmd_buf *cmd_bufs,
-                    uint32_t ncmd_bufs, uint32_t currow, uint32_t curcol) {
-  for (uint32_t bufi = 0; bufi < ncmd_bufs; ++bufi) {
-    struct render_cmd_buf *buf = &cmd_bufs[bufi];
-    uint64_t ncmds = buf->ncmds;
-    struct render_cmd *cmds = buf->cmds;
+struct command_list *command_list_create(uint32_t capacity, alloc_fn allocator,
+                                         uint32_t xoffset, uint32_t yoffset) {
+  struct command_list *command_list = allocator(sizeof(struct command_list));
 
-    for (uint64_t cmdi = 0; cmdi < ncmds; ++cmdi) {
-      struct render_cmd *cmd = &cmds[cmdi];
-      display_move_cursor(display, cmd->row + buf->yoffset,
-                          cmd->col + buf->xoffset);
-      putbytes(cmd->data, cmd->len);
-      delete_to_eol();
-    }
+  command_list->capacity = capacity;
+  command_list->ncmds = 0;
+  command_list->xoffset = xoffset;
+  command_list->yoffset = yoffset;
+  command_list->format_len = 0;
+
+  command_list->cmds = allocator(sizeof(struct render_command) * capacity);
+
+  return command_list;
+}
+
+void push_format(struct command_list *list, const char *fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+  if (list->format_len == 0) {
+    list->format[0] = ESC;
+    list->format[1] = '[';
+
+    list->format_len = 2;
+  }
+
+  if (list->format_len > 2) {
+    list->format[list->format_len] = ';';
+    ++list->format_len;
+  }
+
+  uint32_t format_space_left = sizeof(list->format) - 1 - list->format_len;
+  list->format_len += vsnprintf((char *)(list->format + list->format_len),
+                                format_space_left, fmt, args);
+
+  va_end(args);
+}
+
+void flush_format(struct command_list *list, uint32_t col, uint32_t row) {
+  list->format[list->format_len] = 'm';
+  ++list->format_len;
+
+  struct render_command *cmd = &list->cmds[list->ncmds];
+  cmd->data = list->format;
+  cmd->col = col + list->xoffset;
+  cmd->row = row + list->yoffset;
+  cmd->len = list->format_len;
+
+  list->format_len = 0;
+
+  ++list->ncmds;
+}
+
+void command_list_draw_text(struct command_list *list, uint32_t col,
+                            uint32_t row, uint8_t *data, uint32_t len) {
+  uint32_t needed_capacity = list->ncmds + 1;
+  if (list->format_len > 0) {
+    ++needed_capacity;
   }
 
-  display_move_cursor(display, currow, curcol);
+  if (needed_capacity > list->capacity) {
+    // TODO: better
+    return;
+  }
+
+  if (list->format_len > 0) {
+    flush_format(list, col, row);
+  }
+
+  struct render_command *cmd = &list->cmds[list->ncmds];
+  cmd->data = data;
+  cmd->col = col + list->xoffset;
+  cmd->row = row + list->yoffset;
+  cmd->len = len;
+
+  ++list->ncmds;
+}
 
-  fflush(stdout);
+void command_list_set_index_color_fg(struct command_list *list,
+                                     uint8_t color_idx) {
+  if (color_idx < 8) {
+    push_format(list, "%d", 30 + color_idx);
+  } else if (color_idx < 16) {
+    push_format(list, "%d", 90 + color_idx);
+  } else {
+    push_format(list, "30;5;%d", color_idx);
+  }
+}
+void command_list_set_color_fg(struct command_list *list, uint8_t red,
+                               uint8_t green, uint8_t blue) {
+  push_format(list, "30;2;%d;%d;%d", red, green, blue);
+}
+
+void command_list_set_index_color_bg(struct command_list *list,
+                                     uint8_t color_idx) {
+  if (color_idx < 8) {
+    push_format(list, "%d", 40 + color_idx);
+  } else if (color_idx < 16) {
+    push_format(list, "%d", 100 + color_idx);
+  } else {
+    push_format(list, "40;5;%d", color_idx);
+  }
 }
+
+void command_list_set_color_bg(struct command_list *list, uint8_t red,
+                               uint8_t green, uint8_t blue) {
+  push_format(list, "40;2;%d;%d;%d", red, green, blue);
+}
+
+void command_list_reset_color(struct command_list *list) {
+  push_format(list, "0");
+}
+
+void display_render(struct display *display,
+                    struct command_list *command_list) {
+
+  struct command_list *cl = command_list;
+
+  for (uint64_t cmdi = 0; cmdi < cl->ncmds; ++cmdi) {
+    struct render_command *cmd = &cl->cmds[cmdi];
+    display_move_cursor(display, cmd->row, cmd->col);
+    putbytes(cmd->data, cmd->len);
+    delete_to_eol();
+  }
+}
+
+void display_begin_render(struct display *display) {}
+void display_end_render(struct display *display) { fflush(stdout); }
-- 
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