On Thu, 26 May 2016 11:24:44 +0100 Graeme Geldenhuys <mailingli...@geldenhuys.co.uk> wrote:
>[...] > 3) The FData image buffer (assuming (1) is correct) uses Integer instead > of Byte as it's element size. So I'm assuming a singe Integer hold > all the colour information for a single pixel? No, TFPMemoryImage uses one TFPColor per pixel (48bit). TFPCompactImgGray8Bit uses 8bit. TFPCompactImgGray16Bit uses 16bit. TFPCompactImgRGB8Bit uses 24bit. TFPCompactImgRGBA8Bit uses 32bit. and so forth... > But then again, I have noticed that TFPColor uses Word size data > elements, thus the whole RGBA information per pixel will be 8 bytes > of data, and Integer is only 4 bytes large. The integer is only the palette index. > 4) What is the order in which the colour channel information is stored > in memory? RGB, BGR, RGBA, BGRA, ARGB, ABGR etc? Each memory image uses a packed record. For example TFPMemoryImage uses TFPColor, TFPCompactImgRGBA8Bit uses TFPCompactImgRGBA8BitValue. It is typically RGBA. > 5) Is the Alpha channel actually stored? I assume it is, because the > Integer type is large enough to hold that information. See above. Mattias _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
