self:is_compressed

local result = self:is_compressed()

No parameters are accepted by this function

Type	Name	Description
`bool`	result	`true` if the image is GPU block-compressed, `false` otherwise

Check compression state before compressing

local entity = core.image.create("assets/diffuse.png")

if not entity:is_compressed() then
    entity:compress(core.image.compression_mode.S3TC)
end

Guard a convert call against compressed images

local entity = core.image.create("assets/sprite.png")

if not entity:is_compressed() then
    entity:convert(core.image.texel_format.RGBA8)
end