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kicad/thirdparty/libpopcnt/LICENSE
Seth Hillbrand 5e0abadb23 Reorganize layer numbering
F_Cu = 0
B_Cu = 2
Remaining internal copper layers are even and incrementing

Non-copper layers are odd and incrementing.

This means that we can no longer do things like:
for( PCB_LAYER_ID layer = F_Cu; layer <= B_Cu; ++layer)
Instead, we have the class LAYER_RANGE:
for( PCB_LAYER_ID layer : LAYER_RANGE( F_Cu, B_Cu) )

Similarly, gt/lt tests should not refer to the integer value of the
layer.  We have functions such as IsCopperLayer to test whether a layer
is copper or not.

When using the connectivity RTree, the third dimension is layer, so we
provide B_Cu with the special INT_MAX value, ensuring that elements
between F_Cu and B_Cu will be identified.  There is a new, special
function GetBoardLayer() for interfacing with CN_ITEMS

Similarly, PNS layers remain unchanged and sequential.  A set of
interface functions is provided to map PNS layers to Board layers and
back.  This allows the PNS_LAYER_RANGE to function as expected
2024-09-06 23:07:58 +00:00

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