pdf_keep_material(fz_context *ctx, pdf_material *mat)
{
	if (mat->colorspace)
		fz_keep_colorspace(ctx, mat->colorspace);
	if (mat->pattern)
		pdf_keep_pattern(ctx, mat->pattern);
	if (mat->shade)
		fz_keep_shade(ctx, mat->shade);
	return mat;
}
Unknown