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grdinfo: Fix pad for external wrappers and update grid header for -L option#8528

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seisman merged 1 commit intomasterfrom
grdinfo-L
Jun 24, 2024
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grdinfo: Fix pad for external wrappers and update grid header for -L option#8528
seisman merged 1 commit intomasterfrom
grdinfo-L

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@seisman seisman commented Jun 24, 2024

Closes #8525.


Out = gmt_new_record (GMT, (n_cols) ? out : NULL, (cmode) == GMT_COL_FIX ? record : NULL); /* the two items */

gmt_set_pad (API->GMT, 0); /* Not read pads to simplify operations */
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@joa-quim Do you see any side effects removing this line?

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simplify operations does not seems a reason good enough. Specially when it has buggish side effects, so I would say we should remove it and see if there are any noticeable side effects.

The pad is big annoyance for externals transfering grids in memory because it implies making a full copy of the array and for many operations, grdinfo for example, the pad is not necessary at all. In Julia I try to distinguish uses where pad is needed (projections, gradients, etc...) from others where it doesn't and in those case I set the pad to zero.

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seisman commented Jun 24, 2024

No new failures and the original bug is fixed. Merging.

@seisman seisman merged commit f31c583 into master Jun 24, 2024
@seisman seisman deleted the grdinfo-L branch June 24, 2024 14:34
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seisman commented Jun 24, 2024

The pad is big annoyance for externals transfering grids in memory because it implies making a full copy of the array and for many operations, grdinfo for example, the pad is not necessary at all. In Julia I try to distinguish uses where pad is needed (projections, gradients, etc...) from others where it doesn't and in those case I set the pad to zero.

How do I know if a module needs pad or not?

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Well, a little bit by reasoning + trial-error. Making a projected image needs pad but a linear one (-JX) does not. Shading needs pad because of the gradient. Also, when a module needs the pad and grid/image do not have it, an error is issued.

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seisman commented Jun 25, 2024

Good to know. Will see how it works in PyGMT.

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grdinfo -L doesn't work for external wrappers

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