AGG第四十二课 Blitting an image over another with transparency
问题:I'vemanagedtoblitaloadedp_w_picpathontoanotherthroughthemethod"copy_from(...)"ofrenderer_base.I'dliketoknowhowcaniblitthesamep_w_picpathandalsospecifyingacolorthatwillNOToverwritethepixelsofthedest