PNGDEC: Add horizontal/vertical flip and index alpha #1088
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Add reflect_x and reflect_y options to PNGDEC. Internally these are now used in conjunction with swap_xy to achieve reflection and rotation.
Support supplying a palette index to use as a transparent colour for indexed PNG files without explicit transparency.
Gadgetoid
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These are very useful - in conjunction with PNGDEC's
source=(x, y, w, h)argument - for spritework.