forked from AuroraMiddleware/gtk
transformnode: Avoid matrix multiplication if we can
If the given matrix is explicitly of category IDENTITY, we don't need to do anything, and in the 2D_TRANSLATE case, just offset the child bounds. Those are the two most common cases.
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@ -2547,9 +2547,30 @@ gsk_transform_node_new_with_category (GskRenderNode *child,
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graphene_matrix_init_from_matrix (&self->transform, transform);
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self->category = category;
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graphene_matrix_transform_bounds (&self->transform,
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&child->bounds,
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&self->render_node.bounds);
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switch (category)
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{
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case GSK_MATRIX_CATEGORY_IDENTITY:
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graphene_rect_init_from_rect (&self->render_node.bounds, &child->bounds);
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break;
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case GSK_MATRIX_CATEGORY_2D_TRANSLATE:
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{
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graphene_rect_init_from_rect (&self->render_node.bounds, &child->bounds);
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self->render_node.bounds.origin.x += graphene_matrix_get_value (transform, 3, 0);
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self->render_node.bounds.origin.y += graphene_matrix_get_value (transform, 3, 1);
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}
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break;
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case GSK_MATRIX_CATEGORY_2D_AFFINE:
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case GSK_MATRIX_CATEGORY_ANY:
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case GSK_MATRIX_CATEGORY_UNKNOWN:
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case GSK_MATRIX_CATEGORY_INVERTIBLE:
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default:
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graphene_matrix_transform_bounds (&self->transform,
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&child->bounds,
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&self->render_node.bounds);
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}
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return &self->render_node;
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}
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