config: add cursor.unfocused-style

This option controls how we render the cursor when the terminal window
is unfocused.

Possible values are:

* hollow: the default, and how we rendered the cursor before this
  patch.
* unchanged: render the cursor exactly the same way as when the window
  is focused.
* none: do not render any cursor at all

Closes #1582

CHANGELOG.md

@@ -52,6 +52,13 @@
 
 ## Unreleased
 ### Added
+
+* `cursor.unfocused-style=unchanged|hollow|none` to `foot.ini`. The
+  default is `hollow` ([#1582][1582]).
+
+[1582]: https://codeberg.org/dnkl/foot/issues/1582
+
+
 ### Changed
 ### Deprecated
 ### Removed

config.c

@@ -1383,6 +1383,16 @@ parse_section_cursor(struct context *ctx)
             (int *)&conf->cursor.style);
     }
 
+    else if (streq(key, "unfocused-style")) {
+        _Static_assert(sizeof(conf->cursor.unfocused_style) == sizeof(int),
+                       "enum is not 32-bit");
+
+        return value_to_enum(
+            ctx,
+            (const char *[]){"unchanged", "hollow", "none", NULL},
+            (int *)&conf->cursor.unfocused_style);
+    }
+
     else if (streq(key, "blink"))
         return value_to_bool(ctx, &conf->cursor.blink);
 
@@ -3090,6 +3100,7 @@ config_load(struct config *conf, const char *conf_path,
 
         .cursor = {
             .style = CURSOR_BLOCK,
+            .unfocused_style = CURSOR_UNFOCUSED_HOLLOW,
             .blink = false,
             .color = {
                 .text = 0,

config.h

@@ -28,6 +28,11 @@ struct font_size_adjustment {
 };
 
 enum cursor_style { CURSOR_BLOCK, CURSOR_UNDERLINE, CURSOR_BEAM };
+enum cursor_unfocused_style {
+    CURSOR_UNFOCUSED_UNCHANGED,
+    CURSOR_UNFOCUSED_HOLLOW,
+    CURSOR_UNFOCUSED_NONE
+};
 
 enum conf_size_type {CONF_SIZE_PX, CONF_SIZE_CELLS};
 
@@ -256,6 +261,7 @@ struct config {
 
     struct {
         enum cursor_style style;
+        enum cursor_unfocused_style unfocused_style;
         bool blink;
         struct {
             uint32_t text;

doc/foot.ini.5.scd

@@ -500,6 +500,15 @@ applications can change these at runtime.
 	*beam* or *underline*. Note that this can be overridden by
 	applications. Default: _block_.
 
+*unfocused-style*
+	Configures how the cursor is rendered when the terminal window is
+	unfocused. Possible values are:
+	
+	- unchanged: render cursor in exactly the same way as when the
+	  window has focus.
+	- hollow: render a block cursor, but hollowed out.
+	- none: do not display any cursor at all.
+
 *blink*
 	Boolean. Enables blinking cursor. Note that this can be overridden
 	by applications. Default: _no_.

render.c

@@ -305,8 +305,8 @@ color_brighten(const struct terminal *term, uint32_t color)
 }
 
 static void
-draw_unfocused_block(const struct terminal *term, pixman_image_t *pix,
-                     const pixman_color_t *color, int x, int y, int cell_cols)
+draw_hollow_block(const struct terminal *term, pixman_image_t *pix,
+                  const pixman_color_t *color, int x, int y, int cell_cols)
 {
     const int scale = (int)roundf(term->scale);
     const int width = min(min(scale, term->cell_width), term->cell_height);
@@ -429,10 +429,23 @@ draw_cursor(const struct terminal *term, const struct cell *cell,
 
     switch (term->cursor_style) {
     case CURSOR_BLOCK:
-        if (unlikely(!term->kbd_focus))
-            draw_unfocused_block(term, pix, &cursor_color, x, y, cols);
+        if (unlikely(!term->kbd_focus)) {
+            switch (term->conf->cursor.unfocused_style) {
+            case CURSOR_UNFOCUSED_UNCHANGED:
+                break;
 
-        else if (likely(term->cursor_blink.state == CURSOR_BLINK_ON)) {
+            case CURSOR_UNFOCUSED_HOLLOW:
+                draw_hollow_block(term, pix, fg, x, y, cols);
+                return;
+
+            case CURSOR_UNFOCUSED_NONE:
+                return;
+            }
+        }
+
+        if (likely(term->cursor_blink.state == CURSOR_BLINK_ON) ||
+            !term->kbd_focus)
+        {
             *fg = text_color;
             pixman_image_fill_rectangles(
                 PIXMAN_OP_SRC, pix, &cursor_color, 1,
@@ -1513,7 +1526,7 @@ render_ime_preedit_for_seat(struct terminal *term, struct seat *seat,
             /* Hollow cursor */
             if (start >= 0 && end <= term->cols) {
                 int cols = end - start;
-                draw_unfocused_block(term, buf->pix[0], &cursor_color, x, y, cols);
+                draw_hollow_block(term, buf->pix[0], &cursor_color, x, y, cols);
             }
 
             term_ime_set_cursor_rect(
@@ -3373,7 +3386,7 @@ render_search_box(struct terminal *term)
 
                     /* TODO: how do we handle a partially hidden rectangle? */
                     if (start >= 0 && end <= visible_cells) {
-                        draw_unfocused_block(
+                        draw_hollow_block(
                             term, buf->pix[0], &fg, x + start * term->cell_width, y, end - start);
                     }
                     term_ime_set_cursor_rect(term,

tests/test-config.c

@@ -635,6 +635,12 @@ test_section_cursor(void)
         (const char *[]){"block", "beam", "underline"},
         (int []){CURSOR_BLOCK, CURSOR_BEAM, CURSOR_UNDERLINE},
         (int *)&conf.cursor.style);
+    test_enum(
+        &ctx, &parse_section_cursor, "unfocused-style",
+        3,
+        (const char *[]){"unchanged", "hollow", "none"},
+        (int []){CURSOR_UNFOCUSED_UNCHANGED, CURSOR_UNFOCUSED_HOLLOW, CURSOR_UNFOCUSED_NONE},
+        (int *)&conf.cursor.unfocused_style);
     test_boolean(&ctx, &parse_section_cursor, "blink", &conf.cursor.blink);
     test_pt_or_px(&ctx, &parse_section_cursor, "beam-thickness",
                   &conf.cursor.beam_thickness);