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scaling test: Skip floating-point pixel formats with Cairo renderer

Simon McVittie requested to merge wip/smcv/bug6978 into main

Based on !7680 (merged), please review that first (this MR needs some utility code from that one, and also some of its changes would conflict).

  • scaling test: Skip floating-point pixel formats with Cairo renderer

    If the four chosen pixel values happen to have alpha values that average to 16/17, GTK will quantize that into 8bpp integer space as 16/17*255 = 240, but Cairo/Pixman does its quantization differently and gets 16/17*256 = 241.

    Resolves: #6978

Edited by Simon McVittie

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