From eda023cee8fbb416fe0e9cbc2461a91a47b83497 Mon Sep 17 00:00:00 2001
From: Harry Fei <tiziyuanfang@gmail.com>
Date: Sat, 15 Aug 2020 21:09:26 +0800
Subject: [PATCH] webrender: add more stub functions for wrterm.

---
 rust_src/src/webrender/font.rs |  6 ------
 rust_src/src/webrender/term.rs | 35 +++++++++++++++++++++++++++-------
 rust_src/src/wrterm.rs         | 15 ++++++++++++---
 3 files changed, 40 insertions(+), 16 deletions(-)

diff --git a/rust_src/src/webrender/font.rs b/rust_src/src/webrender/font.rs
index d56aa44a0ae..35f897a578e 100644
--- a/rust_src/src/webrender/font.rs
+++ b/rust_src/src/webrender/font.rs
@@ -37,7 +37,6 @@ lazy_static! {
         font_driver.list_family = Some(list_family);
         font_driver.open = Some(open);
         font_driver.close = Some(close);
-        font_driver.has_char = Some(has_char);
         font_driver.encode_char = Some(encode_char);
         font_driver.text_extents = Some(text_extents);
         font_driver.draw = Some(draw);
@@ -208,11 +207,6 @@ extern "C" fn open(_f: *mut frame, font_entity: LispObject, pixel_size: i32) ->
 
 extern "C" fn close(_font: *mut font) {}
 
-#[allow(unused_variables)]
-extern "C" fn has_char(font: LispObject, c: i32) -> i32 {
-    unimplemented!();
-}
-
 extern "C" fn encode_char(_font: *mut font, c: i32) -> u32 {
     c as u32
 }
diff --git a/rust_src/src/webrender/term.rs b/rust_src/src/webrender/term.rs
index 5fecdc44d9b..84f6275c6f0 100644
--- a/rust_src/src/webrender/term.rs
+++ b/rust_src/src/webrender/term.rs
@@ -5,8 +5,9 @@ use super::display_info::{DisplayInfo, DisplayInfoRef};
 use crate::{
     lisp::{ExternalPtr, LispObject},
     remacs_sys::{
-        allocate_kboard, create_terminal, current_kboard, frame_parm_handler, initial_kboard,
-        output_method, redisplay_interface, terminal, xlispstrdup, Fcons, Qnil, Qwr, KBOARD,
+        allocate_kboard, create_terminal, current_kboard, frame_parm_handler, glyph_row,
+        glyph_string, initial_kboard, output_method, redisplay_interface, terminal, xlispstrdup,
+        Fcons, Lisp_Frame, Lisp_Window, Qnil, Qwr, KBOARD,
     },
     remacs_sys::{
         x_clear_end_of_line, x_clear_window_mouse_face, x_fix_overlapping_area,
@@ -98,9 +99,9 @@ lazy_static! {
             insert_glyphs: None,
             clear_end_of_line: Some(x_clear_end_of_line),
             scroll_run_hook: None,
-            after_update_window_line_hook: None,
-            update_window_begin_hook: None,
-            update_window_end_hook: None,
+            after_update_window_line_hook: Some(after_update_window_line),
+            update_window_begin_hook: Some(update_window_begin),
+            update_window_end_hook: Some(update_window_end),
             flush_display: None,
             clear_window_mouse_face: Some(x_clear_window_mouse_face),
             get_glyph_overhangs: Some(x_get_glyph_overhangs),
@@ -109,9 +110,9 @@ lazy_static! {
             define_fringe_bitmap: None,
             destroy_fringe_bitmap: None,
             compute_glyph_string_overhangs: None,
-            draw_glyph_string: None,
+            draw_glyph_string: Some(draw_glyph_string),
             define_frame_cursor: None,
-            clear_frame_area: None,
+            clear_frame_area: Some(clear_frame_area),
             draw_window_cursor: None,
             draw_vertical_window_border: None,
             draw_window_divider: None,
@@ -124,6 +125,26 @@ lazy_static! {
     };
 }
 
+#[allow(unused_variables)]
+extern "C" fn update_window_begin(w: *mut Lisp_Window) {}
+
+#[allow(unused_variables)]
+extern "C" fn update_window_end(
+    w: *mut Lisp_Window,
+    cursor_no_p: bool,
+    mouse_face_overwritten_p: bool,
+) {
+}
+
+#[allow(unused_variables)]
+extern "C" fn after_update_window_line(w: *mut Lisp_Window, desired_row: *mut glyph_row) {}
+
+#[allow(unused_variables)]
+extern "C" fn draw_glyph_string(s: *mut glyph_string) {}
+
+#[allow(unused_variables)]
+extern "C" fn clear_frame_area(s: *mut Lisp_Frame, x: i32, y: i32, width: i32, height: i32) {}
+
 fn wr_create_terminal(mut dpyinfo: DisplayInfoRef) -> TerminalRef {
     let terminal_ptr = unsafe {
         create_terminal(
diff --git a/rust_src/src/wrterm.rs b/rust_src/src/wrterm.rs
index fa84dfdd5f8..8eee6aab19d 100644
--- a/rust_src/src/wrterm.rs
+++ b/rust_src/src/wrterm.rs
@@ -64,7 +64,7 @@ pub extern "C" fn wr_get_display_info(output: OutputRef) -> DisplayInfoRef {
 #[allow(unused_variables)]
 #[no_mangle]
 pub extern "C" fn wr_get_display(display_info: DisplayInfoRef) -> DisplayRef {
-    unimplemented!();
+    DisplayRef::new(ptr::null_mut())
 }
 
 #[allow(unused_variables)]
@@ -105,10 +105,19 @@ pub extern "C" fn x_get_keysym_name(keysym: i32) -> *mut libc::c_char {
 #[no_mangle]
 pub extern "C" fn x_clear_under_internal_border(frame: LispFrameRef) {}
 
+// This function should be called by Emacs redisplay code to set the
+// name; names set this way will never override names set by the user's
+// lisp code.
 #[allow(unused_variables)]
 #[no_mangle]
-pub extern "C" fn x_implicitly_set_name(frame: LispFrameRef, arg: LispObject, oldval: LispObject) {
-    unimplemented!();
+pub extern "C" fn x_implicitly_set_name(
+    mut frame: LispFrameRef,
+    arg: LispObject,
+    oldval: LispObject,
+) {
+    if frame.name.is_nil() {
+        frame.name = arg;
+    }
 }
 
 #[allow(unused_variables)]