Quick FMX tip – TBitmap.CopyFromBitmap is not synonymous with TBitmap.Assign

Quick FireMonkey tip – if you are calling the CopyFromBitmap method of TBitmap and wondering why it isn’t working (cf. the first issue reported here), it’s probably because you are attempting to write to an empty bitmap. In other words, like the CopyRect method in the VCL, CopyFromBitmap does not resize the destination bitmap, so the latter needs to be big enough beforehand if you want all the source pixels to be copied over. Nonetheless, if you want to resize the destination bitmap as well, just call Assign rather than CopyFromBitmap:


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