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Irreversible decoding: align code more closely to the standard by avoid messing up with stepsize (no functional change)

This commit is contained in:
Even Rouault 2020-05-20 13:14:16 +02:00
parent e46e300de5
commit f38c069547
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GPG Key ID: 33EBBFC47B3DD87D
2 changed files with 10 additions and 8 deletions
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8
src/lib/openjp2/t1.c
View File

@ -1725,10 +1725,11 @@ static void opj_t1_clbl_decode_processor(void* user_data, opj_tls_t* tls)
datap[i] /= 2;
}
} else { /* if (tccp->qmfbid == 0) */
const float stepsize = 0.5f * band->stepsize;
i = 0;
#ifdef __SSE2__
{
const __m128 xmm_stepsize = _mm_set1_ps(band->stepsize);
const __m128 xmm_stepsize = _mm_set1_ps(stepsize);
for (; i < (cblk_size & ~15U); i += 16) {
__m128 xmm0_data = _mm_cvtepi32_ps(_mm_load_si128((__m128i * const)(
datap + 0)));
@ -1747,7 +1748,7 @@ static void opj_t1_clbl_decode_processor(void* user_data, opj_tls_t* tls)
}
#endif
for (; i < cblk_size; ++i) {
OPJ_FLOAT32 tmp = ((OPJ_FLOAT32)(*datap)) * band->stepsize;
OPJ_FLOAT32 tmp = ((OPJ_FLOAT32)(*datap)) * stepsize;
memcpy(datap, &tmp, sizeof(tmp));
datap++;
}
@ -1773,12 +1774,13 @@ static void opj_t1_clbl_decode_processor(void* user_data, opj_tls_t* tls)
}
}
} else { /* if (tccp->qmfbid == 0) */
const float stepsize = 0.5f * band->stepsize;
OPJ_FLOAT32* OPJ_RESTRICT tiledp = (OPJ_FLOAT32*) &tilec->data[(OPJ_SIZE_T)y *
tile_w + (OPJ_SIZE_T)x];
for (j = 0; j < cblk_h; ++j) {
OPJ_FLOAT32* OPJ_RESTRICT tiledp2 = tiledp;
for (i = 0; i < cblk_w; ++i) {
OPJ_FLOAT32 tmp = (OPJ_FLOAT32) * datap * band->stepsize;
OPJ_FLOAT32 tmp = (OPJ_FLOAT32) * datap * stepsize;
*tiledp2 = tmp;
datap++;
tiledp2++;

10
src/lib/openjp2/tcd.c
View File

@ -112,7 +112,7 @@ void tcd_dump(FILE *fd, opj_tcd_t *tcd, opj_tcd_image_t * img)
* Initializes tile coding/decoding
*/
static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
OPJ_BOOL isEncoder, OPJ_FLOAT32 fraction, OPJ_SIZE_T sizeof_block,
OPJ_BOOL isEncoder, OPJ_SIZE_T sizeof_block,
opj_event_mgr_t* manager);
/**
@ -721,7 +721,7 @@ OPJ_BOOL opj_alloc_tile_component_data(opj_tcd_tilecomp_t *l_tilec)
/* ----------------------------------------------------------------------- */
static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
OPJ_BOOL isEncoder, OPJ_FLOAT32 fraction, OPJ_SIZE_T sizeof_block,
OPJ_BOOL isEncoder, OPJ_SIZE_T sizeof_block,
opj_event_mgr_t* manager)
{
OPJ_UINT32(*l_gain_ptr)(OPJ_UINT32) = 00;
@ -1013,7 +1013,7 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
/* 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,
(OPJ_INT32)(numbps - l_step_size->expn)))) * fraction;
(OPJ_INT32)(numbps - l_step_size->expn))));
/* Mb value of Equation E-2 in "E.1 Inverse quantization
* procedure" of the standard */
l_band->numbps = l_step_size->expn + (OPJ_INT32)l_tccp->numgbits -
@ -1196,14 +1196,14 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
OPJ_BOOL opj_tcd_init_encode_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
opj_event_mgr_t* p_manager)
{
return opj_tcd_init_tile(p_tcd, p_tile_no, OPJ_TRUE, 1.0F,
return opj_tcd_init_tile(p_tcd, p_tile_no, OPJ_TRUE,
sizeof(opj_tcd_cblk_enc_t), p_manager);
}
OPJ_BOOL opj_tcd_init_decode_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
opj_event_mgr_t* p_manager)
{
return opj_tcd_init_tile(p_tcd, p_tile_no, OPJ_FALSE, 0.5F,
return opj_tcd_init_tile(p_tcd, p_tile_no, OPJ_FALSE,
sizeof(opj_tcd_cblk_dec_t), p_manager);
}