api: ImageSpec::scanline_bytes, tile_bytes, image_bytes #4631
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Existing versions could return the expected bytes for a scanline, tile, or image for either the native per-channel types, or the single composite channel type. The new flavor lets you pass in any data type and it tells you how many bytes you'd need for a scanline, tile, or image if all channels were the passed type. (As a special case, the answer for TypeUnknown is the "native" size, same as `thing_bytes(true)`). This is handy for computing how big your buffer needs to be to hold a type-converted scanline or tile. Signed-off-by: Larry Gritz <[email protected]>
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Existing versions could return the expected bytes for a scanline, tile, or image for either the native per-channel types, or the single composite channel type.
The new flavor lets you pass in any data type and it tells you how many bytes you'd need for a scanline, tile, or image if all channels were the passed type. (As a special case, the answer for TypeUnknown is the "native" size, same as
thing_bytes(true)).This is handy for computing how big your buffer needs to be to hold a type-converted scanline or tile.