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I'm using cairo_surface_write_to_png() to generate PNG image sequences from 32-bit source surfaces (ie. CAIRO_FORMAT_ARGB32). I need the resultant files to all have the same format (32-bit with an alpha channel), but cairo generates 24-bit PNG files for any
source images that happen to be entirely opaque (and 32-bit files for those with transparency).</div>
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Is there a way of forcibly generating 32-bit PNGs? (a<span style="color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">nd thus also avoid the performance overhead of _cairo_</span><span style="color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">mage_analyze_transparency()
)</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">Thanks in advance</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">Rob</span></div>
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