Pro Motion NG Compatibility Issues

[behreajj]

Pro Motion's ico files cannot be properly imported. The most immediate issue is the ico header's data size is different. In the simple example below, at 0x0E, 0xC8 is 200, which exceeds the file length when the read ico method searches for the alpha mask at:

AseIcoExport/icoio.lua

Line 188 in 45f2911

local alphaMapOffset <const> = dataOffset + dataSize - lenDWords * 4

Example image, upscaled 10x:

Pro Motion NG version 8.0.10.0

Row	00	01	02	03	04	05	06	07	08	09	0A	0B	0C	0D	0E	0F
00000000	00	00	01	00	01	00	04	02	00	00	01	00	20	00	C8	00
00000010	00	00	16	00	00	00	28	00	00	00	04	00	00	00	04	00
00000020	00	00	01	00	20	00	00	00	00	00	00	00	00	00	00	00
00000030	00	00	00	00	00	00	00	00	00	00	00	00	00	00	19	DD
00000040	FD	00	9C	73	00	FF	79	31	62	FF	19	DD	FD	00	3A	3A
00000050	DC	FF	69	9D	03	FF	19	DD	FD	FF	19	DD	FD	00	90	3A
00000060	DC	FF	10	3A	DC	FF

Aseprite version 1.3.11-beta2 (script, not built-in)

Row	00	01	02	03	04	05	06	07	08	09	0A	0B	0C	0D	0E	0F
00000000	00	00	01	00	01	00	04	02	00	00	01	00	20	00	50	00
00000010	00	00	16	00	00	00	28	00	00	00	04	00	00	00	04	00
00000020	00	00	01	00	20	00	00	00	00	00	00	00	00	00	00	00
00000030	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00
00000040	00	00	9C	73	00	FF	79	31	62	FF	00	00	00	00	3A	3A
00000050	DC	FF	69	9D	03	FF	19	DD	FD	FF	00	00	00	00	90	00
00000060	00	00	10	00	00	00