What is the test for reversing, affirming or modifying a judgment or order in an appeal?

In an appeal on a criminal matter, "[t]he court may reverse, affirm, or modify a judgment or order appealed from, or reduce the degree of the offense or attempted offense or the punishment imposed, and may set aside, affirm, or modify any or all of the proceedings subsequent to, or dependent upon, such judgment or order, and may, if proper, order a new trial and may, if proper, remand the cause to the trial court for such further proceedings as may be just under the circumstances." ( 1260.) "The order of the reviewing court is contained in its remittitur, which defines the scope of the jurisdiction of the court to which the matter is returned. 'The order of the appellate court as stated in the remittitur, "is decisive of the character of the judgment to which the appellant is entitled. The lower court cannot reopen the case on the facts, allow the filing of amended or supplemental pleadings, nor retry the case, and if it should do so, the judgment rendered thereon would be void." ' [Citations]." (Griset v. Fair Political Practices Com. (2001) 25 Cal.4th 688, 701.)

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