lqr_carver_set_energy_function

`lqr_carver_set_energy_function_builtin`
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lqr_carver_bias_set_energy_function_builtin — set a builtin energy function for a LqrCarver object

#include <lqr.h>

`LqrRetVal lqr_carver_set_energy_function_builtin(`	LqrCarver* `carver`,
	LqrEnergyFuncBuiltinType `ef_ind)`;

The function lqr_carver_set_energy_function_builtin allows to pick a builtin energy function for the LqrCarver object pointed to by carver.

The possible values for ef_ind are:

LQR_EF_GRAD_XABS: absolute value of the brightness gradient in the direction of the rescaling (this is the default)
LQR_EF_GRAD_SUMABS: sum of absolute values of the brightness gradients in both directions
LQR_EF_GRAD_NORM: norm of the brightness gradient
LQR_EF_LUMA_GRAD_XABS: absolute value of the luma gradient in the direction of the rescaling
LQR_EF_LUMA_GRAD_SUMABS: sum of absolute values of the luma gradients in both directions
LQR_EF_LUMA_GRAD_NORM: norm of the luma gradient
LQR_EF_NULL: null

All of the above gradient functions have a radius of 1 pixel.

The return value follows the Liquid Rescale library signalling system.