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tcd.c: add comment

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Even Rouault 2020-05-18 20:17:07 +02:00
parent 00cff6f5c0
commit 3d35d0f3af
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src/lib/openjp2/tcd.c
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@ -1009,6 +1009,9 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
/** avoid an if with storing function pointer */ /** avoid an if with storing function pointer */
l_gain = (*l_gain_ptr)(l_band->bandno); l_gain = (*l_gain_ptr)(l_band->bandno);
numbps = (OPJ_INT32)(l_image_comp->prec + l_gain); numbps = (OPJ_INT32)(l_image_comp->prec + l_gain);
/* Delta_b value of Equation E-3 in "E.1 Inverse quantization
* procedure" of the standard */
l_band->stepsize = (OPJ_FLOAT32)(((1.0 + l_step_size->mant / 2048.0) * pow(2.0, l_band->stepsize = (OPJ_FLOAT32)(((1.0 + l_step_size->mant / 2048.0) * pow(2.0,
(OPJ_INT32)(numbps - l_step_size->expn)))) * fraction; (OPJ_INT32)(numbps - l_step_size->expn)))) * fraction;
/* Mb value of Equation E-2 in "E.1 Inverse quantization /* Mb value of Equation E-2 in "E.1 Inverse quantization