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clutter/stage: Round viewport coordinates before setting
cogl_(fromebuffer)_set_viewport will implicitly cast away the fraction of a floating point number, meaning if a coordinate calculation resulted in just below the integer (which for example ~1.75 scaling on a 1920x1080 did), we'd set a one pixel too narrow viewport. Fix this by always rounding the floating point to the closest int before passing, avoiding the precision loss. https://bugzilla.gnome.org/show_bug.cgi?id=765011
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@ -3627,6 +3627,10 @@ _clutter_stage_maybe_setup_viewport (ClutterStage *stage,
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float fb_scale;
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float viewport_offset_x;
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float viewport_offset_y;
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float viewport_x;
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float viewport_y;
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float viewport_width;
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float viewport_height;
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float z_2d;
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CLUTTER_NOTE (PAINT,
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@ -3639,11 +3643,13 @@ _clutter_stage_maybe_setup_viewport (ClutterStage *stage,
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viewport_offset_x = view_layout.x * fb_scale;
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viewport_offset_y = view_layout.y * fb_scale;
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viewport_x = roundf (priv->viewport[0] * fb_scale - viewport_offset_x);
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viewport_y = roundf (priv->viewport[1] * fb_scale - viewport_offset_y);
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viewport_width = roundf (priv->viewport[2] * fb_scale);
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viewport_height = roundf (priv->viewport[3] * fb_scale);
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cogl_framebuffer_set_viewport (fb,
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priv->viewport[0] * fb_scale - viewport_offset_x,
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priv->viewport[1] * fb_scale - viewport_offset_y,
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priv->viewport[2] * fb_scale,
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priv->viewport[3] * fb_scale);
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viewport_x, viewport_y,
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viewport_width, viewport_height);
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perspective = priv->perspective;
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