term: get rid of term->font_scale, use term->scale only

We only needed term->font_scale to be able to detect scaling factor
changes (term->font_scale != term->scale).

But, we already have the old scaling factor in all places where
term_font_dpi_changed() is called, so let’s pass the old scaling
factor as an argument instead.

terminal.c

@@ -769,22 +769,16 @@ get_font_subpixel(const struct terminal *term)
 }
 
 static bool
-font_size_by_dpi_for_scale(const struct terminal *term, int new_scale)
+font_sized_by_dpi(const struct terminal *term, int scale)
 {
     return term->conf->dpi_aware == DPI_AWARE_YES ||
-        (term->conf->dpi_aware == DPI_AWARE_AUTO && new_scale <= 1);
+        (term->conf->dpi_aware == DPI_AWARE_AUTO && scale <= 1);
 }
 
 static bool
-font_sized_by_dpi(const struct terminal *term)
+font_sized_by_scale(const struct terminal *term, int scale)
 {
-    return font_size_by_dpi_for_scale(term, term->font_scale);
+    return !font_sized_by_dpi(term, scale);
-}
-
-static bool
-font_sized_by_scale(const struct terminal *term)
-{
-    return !font_sized_by_dpi(term);
 }
 
 
@@ -824,7 +818,8 @@ reload_fonts(struct terminal *term)
             bool use_px_size = term->font_sizes[i][j].px_size > 0;
             char size[64];
 
-            const int scale = font_sized_by_scale(term) ? term->scale : 1;
+            const int scale =
+                font_sized_by_scale(term, term->scale) ? term->scale : 1;
 
             if (use_px_size)
                 snprintf(size, sizeof(size), ":pixelsize=%d",
@@ -860,7 +855,7 @@ reload_fonts(struct terminal *term)
     const size_t count_bold_italic = custom_bold_italic ? counts[3] : counts[0];
     const char **names_bold_italic = (const char **)(custom_bold_italic ? names[3] : names[0]);
 
-    const bool use_dpi = font_sized_by_dpi(term);
+    const bool use_dpi = font_sized_by_dpi(term, term->scale);
 
     char *attrs[4] = {NULL};
     int attr_len[4] = {-1, -1, -1, -1};  /* -1, so that +1 (below) results in 0 */
@@ -1043,7 +1038,6 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
             xmalloc(sizeof(term->font_sizes[3][0]) * tll_length(conf->fonts[3])),
         },
         .font_dpi = 0.,
-        .font_scale = 0,
         .font_subpixel = (conf->colors.alpha == 0xffff  /* Can't do subpixel rendering on transparent background */
                           ? FCFT_SUBPIXEL_DEFAULT
                           : FCFT_SUBPIXEL_NONE),
@@ -1169,7 +1163,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
         goto err;
 
     /* Load fonts */
-    if (!term_font_dpi_changed(term))
+    if (!term_font_dpi_changed(term, 0))
         goto err;
 
     term->font_subpixel = get_font_subpixel(term);
@@ -1770,19 +1764,19 @@ term_font_size_reset(struct terminal *term)
 }
 
 bool
-term_font_dpi_changed(struct terminal *term)
+term_font_dpi_changed(struct terminal *term, int old_scale)
 {
     float dpi = get_font_dpi(term);
     xassert(term->scale > 0);
 
-    bool was_scaled_using_dpi = font_sized_by_dpi(term);
+    bool was_scaled_using_dpi = font_sized_by_dpi(term, old_scale);
-    bool will_scale_using_dpi = font_size_by_dpi_for_scale(term, term->scale);
+    bool will_scale_using_dpi = font_sized_by_dpi(term, term->scale);
 
     bool need_font_reload =
         was_scaled_using_dpi != will_scale_using_dpi ||
         (will_scale_using_dpi
          ? term->font_dpi != dpi
-         : term->font_scale != term->scale);
+         : old_scale != term->scale);
 
     if (need_font_reload) {
         LOG_DBG("DPI/scale change: DPI-awareness=%s, "
@@ -1795,7 +1789,6 @@ term_font_dpi_changed(struct terminal *term)
     }
 
     term->font_dpi = dpi;
-    term->font_scale = term->scale;
 
     if (!need_font_reload)
         return true;

terminal.h

@@ -320,7 +320,6 @@ struct terminal {
     struct config_font *font_sizes[4];
     struct pt_or_px font_line_height;
     float font_dpi;
-    int font_scale;  /* scaling factor last time we loaded fonts */
     int16_t font_x_ofs;
     int16_t font_y_ofs;
     enum fcft_subpixel font_subpixel;
@@ -614,7 +613,7 @@ bool term_paste_data_to_slave(
 bool term_font_size_increase(struct terminal *term);
 bool term_font_size_decrease(struct terminal *term);
 bool term_font_size_reset(struct terminal *term);
-bool term_font_dpi_changed(struct terminal *term);
+bool term_font_dpi_changed(struct terminal *term, int old_scale);
 void term_font_subpixel_changed(struct terminal *term);
 int term_pt_or_px_as_pixels(
     const struct terminal *term, const struct pt_or_px *pt_or_px);

wayland.c

@@ -285,8 +285,10 @@ update_term_for_output_change(struct terminal *term)
     if (tll_length(term->window->on_outputs) == 0)
         return;
 
+    int old_scale = term->scale;
+
     render_resize(term, term->width / term->scale, term->height / term->scale);
-    term_font_dpi_changed(term);
+    term_font_dpi_changed(term, old_scale);
     term_font_subpixel_changed(term);
 }