gfx/d3d8: Cull text on the top side of the soft scissor too

The font path's whole-line scissor cull added in 5f23e85 only
checked the bottom side: skip when the baseline ly is at or below
the scissor's bottom edge.  The top-side case was left out on the
assumption that entries scrolled above the scissor "don't occur in
practice."  They do — scrolling Ozone's entry list far enough down
pushes the topmost entry's text up past the scissor's top edge,
where it bleeds into the header bar (the icons get correctly
clipped by gfx_display_d3d8_draw's geometry path, but the text
leaked through unchecked).

Add the symmetric ly < sy cull.  Visible glyphs sit at or above
the baseline, so a baseline above sy means the whole line is
above sy and entirely outside the scissor.

Edge-aligned lines (baseline ~ sy or ~ sy2) still render in full;
partial overlap isn't clipped.  Pixel-perfect glyph clipping would
need per-glyph bounding-box checks against the rect with UV remap
similar to what gfx_display_d3d8_draw does for quads, which isn't
worth the complexity for a fallback-quality backend.  The
whole-line cull is enough to stop the visible overflow into both
of Ozone's header and footer regions.

Author: LibretroAdmin

gfx/drivers/d3d8.c

@@ -1406,20 +1406,34 @@ static void d3d8_font_render_line(
       return;
 
    /* Soft scissor for text.  The font path doesn't go through
-    * gfx_display_d3d8_draw, so apply the same skip-only check
-    * here.  ly is the baseline in top-down screen pixels;
-    * visible glyphs sit at and above ly (descenders may dip
-    * slightly below).  Conservative cull when the baseline is
-    * well below the scissor's bottom edge — that's the case
-    * which produces visible overflow into Ozone's footer.  We
-    * deliberately don't cull on the top side: line height isn't
-    * known here and the symmetric overflow (entries above the
-    * scissor) doesn't occur in practice. */
+    * gfx_display_d3d8_draw, so apply a similar skip-only check
+    * here.  ly is the baseline in top-down screen pixels.
+    * Visible glyphs sit at or above ly (the baseline is the
+    * bottom of the line for most glyphs; descenders dip slightly
+    * below).  We don't know the line height here, but two
+    * conservative whole-line culls catch the cases that actually
+    * overflow in practice:
+    *
+    *   - ly >= sy2: baseline at or below the scissor bottom edge
+    *     means the whole line (which is above the baseline) is
+    *     mostly below the scissor.  In Ozone that's the entry
+    *     that has just scrolled past the footer.
+    *   - ly < sy:   baseline above the scissor top edge means
+    *     the whole line is above sy — every visible glyph sits
+    *     above its own baseline, so above sy too.  In Ozone
+    *     that's the entry that has just scrolled past the
+    *     header.
+    *
+    * Edge-aligned lines (baseline ~ sy or ~ sy2) still render in
+    * full — partial overlap isn't culled.  Pixel-perfect glyph
+    * clipping would need per-glyph bounding-box checks; the
+    * whole-line cull is enough to stop the visible overflow into
+    * Ozone's header/footer regions. */
    if (d3d->menu_display.scissor_active)
    {
-      int sy2 = d3d->menu_display.scissor_y
-              + d3d->menu_display.scissor_h;
-      if (ly >= sy2)
+      int sy  = d3d->menu_display.scissor_y;
+      int sy2 = sy + d3d->menu_display.scissor_h;
+      if (ly >= sy2 || ly < sy)
          return;
    }