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st/theme-node-drawing: Conditionally paint the center shadow rectangle

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Only when part of it is actually visible.

Because the central rectangle is generally the largest part, this
eliminates most of the shadow's render time. For example, animating
`.workspace-background` by tapping Super, the shell's overall render
time is reduced about 15%.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1915>
This commit is contained in:
Daniel van Vugt 2021-05-25 17:33:01 +08:00 committed by Marge Bot
parent 436fd81cfc
commit 9b3ee774f6
1 changed files with 18 additions and 9 deletions
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11
src/st/st-theme-node-drawing.c
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@ -2021,6 +2021,8 @@ st_theme_node_paint_sliced_shadow (StThemeNodePaintState *state,
gfloat shadow_blur_radius, x_spread_factor, y_spread_factor;
float rectangles[8 * 9];
gint idx;
ClutterColor background_color;
static const ClutterColor invisible_occluded = {3, 2, 1, 0};
if (paint_opacity == 0)
return;
@ -2178,7 +2180,13 @@ st_theme_node_paint_sliced_shadow (StThemeNodePaintState *state,
rectangles[idx++] = s_bottom;
}
/* Center middle */
/* Center middle is not definitely occluded? */
st_theme_node_get_background_color (node, &background_color);
if (!clutter_color_equal (&background_color, &invisible_occluded) ||
paint_opacity < 255 ||
xoffset > shadow_blur_radius || left < 0 ||
yoffset > shadow_blur_radius || top < 0)
{
rectangles[idx++] = left;
rectangles[idx++] = top;
rectangles[idx++] = right;
@ -2188,6 +2196,7 @@ st_theme_node_paint_sliced_shadow (StThemeNodePaintState *state,
rectangles[idx++] = s_top;
rectangles[idx++] = s_right;
rectangles[idx++] = s_bottom;
}
if (xend > right)
{