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clutter/blur: Shortcircuit when sigma is 0
When there's no blur to be performed, don't do any; instead, return the original texture, and don't run the vertical and horizontal blur pipelines. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1637>
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@ -355,6 +355,9 @@ clutter_blur_new (CoglTexture *texture,
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blur->source_texture = cogl_object_ref (texture);
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blur->downscale_factor = calculate_downscale_factor (width, height, sigma);
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if (sigma == 0)
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goto out;
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vpass = &blur->pass[VERTICAL];
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hpass = &blur->pass[HORIZONTAL];
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@ -365,6 +368,7 @@ clutter_blur_new (CoglTexture *texture,
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return NULL;
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}
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out:
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return g_steal_pointer (&blur);
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}
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@ -378,6 +382,9 @@ clutter_blur_new (CoglTexture *texture,
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void
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clutter_blur_apply (ClutterBlur *blur)
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{
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if (blur->sigma == 0)
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return;
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apply_blur_pass (&blur->pass[VERTICAL]);
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apply_blur_pass (&blur->pass[HORIZONTAL]);
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}
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@ -394,7 +401,10 @@ clutter_blur_apply (ClutterBlur *blur)
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CoglTexture *
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clutter_blur_get_texture (ClutterBlur *blur)
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{
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return blur->pass[HORIZONTAL].texture;
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if (blur->sigma == 0)
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return blur->source_texture;
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else
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return blur->pass[HORIZONTAL].texture;
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}
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/**
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