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[trunk] fixed component precision upscaling in opj_decompress (fixes issue 458)

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This commit is contained in:
Matthieu Darbois 2014-12-22 15:50:32 +00:00
parent bde5ba6ae8
commit 59b844347c
3 changed files with 37 additions and 22 deletions
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52
src/bin/jp2/convert.c
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@ -102,43 +102,51 @@ void clip_component(opj_image_comp_t* component, OPJ_UINT32 precision)
}
/* Component precision scaling */
static void scale_component_up(opj_image_comp_t* component, OPJ_UINT32 precision)
{
OPJ_SIZE_T i, len;
len = (OPJ_SIZE_T)component->w * (OPJ_SIZE_T)component->h;
if (component->sgnd) {
OPJ_INT64 newMax = (1U << (precision - 1));
OPJ_INT64 oldMax = (1U << (component->prec - 1));
OPJ_INT32* l_data = component->data;
for (i = 0; i < len; ++i) {
l_data[i] = (OPJ_INT32)(((OPJ_INT64)l_data[i] * newMax) / oldMax);
}
} else {
OPJ_UINT64 newMax = (1U << precision) - 1U;
OPJ_UINT64 oldMax = (1U << component->prec) - 1U;
OPJ_UINT32* l_data = (OPJ_UINT32*)component->data;
for (i = 0; i < len; ++i) {
l_data[i] = (OPJ_UINT32)(((OPJ_UINT64)l_data[i] * newMax) / oldMax);
}
}
component->prec = precision;
}
void scale_component(opj_image_comp_t* component, OPJ_UINT32 precision)
{
int shift;
OPJ_SIZE_T i;
OPJ_SIZE_T len;
OPJ_SIZE_T i, len;
if (component->prec == precision) {
return;
}
if (component->prec < precision) {
shift = (int)(precision - component->prec);
} else {
shift = (int)(component->prec - precision);
scale_component_up(component, precision);
return;
}
shift = (int)(component->prec - precision);
len = (OPJ_SIZE_T)component->w * (OPJ_SIZE_T)component->h;
if (component->sgnd) {
OPJ_INT32* l_data = component->data;
if (component->prec < precision) {
for (i = 0; i < len; ++i) {
l_data[i] <<= shift;
}
} else {
for (i = 0; i < len; ++i) {
l_data[i] >>= shift;
}
for (i = 0; i < len; ++i) {
l_data[i] >>= shift;
}
} else {
OPJ_UINT32* l_data = (OPJ_UINT32*)component->data;
if (component->prec < precision) {
for (i = 0; i < len; ++i) {
l_data[i] <<= shift;
}
} else {
for (i = 0; i < len; ++i) {
l_data[i] >>= shift;
}
for (i = 0; i < len; ++i) {
l_data[i] >>= shift;
}
}
component->prec = precision;

4
tests/nonregression/md5refs.txt
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@ -175,3 +175,7 @@ d5ecef537edf294af83826763c0cf860 issue411-ycc422.jp2_1.pgx
07480962d25b3d8cce18096648963c8a issue411-ycc420.jp2_0.pgx
149a69831b42401f20b8f7492ef99d97 issue411-ycc420.jp2_1.pgx
ec8d1c99db9763a8ba489df4f41dda53 issue411-ycc420.jp2_2.pgx
3c7ff2e4bdae849167be36589f32bcd5 issue458.jp2_0.pgx
f004b48eafb2e52529cc9c7b6a3ff5d2 issue458.jp2_1.pgx
3127bd0a591d113c3c2428c8d2c14ec8 issue458.jp2_2.pgx
dacaf60e4c430916a8c2a9ebec32e71c issue458.jp2_3.pgx

3
tests/nonregression/test_suite.ctest.in
View File

@ -258,6 +258,9 @@ opj_decompress -i @INPUT_NR_PATH@/issue411-ycc420.jp2 -o @TEMP_PATH@/issue411-yc
!opj_decompress -i @INPUT_NR_PATH@/issue427-null-image-size.jp2 -o @TEMP_PATH@/issue427-null-image-size.jp2.pgx
# issue 427 illegal tile offset
!opj_decompress -i @INPUT_NR_PATH@/issue427-illegal-tile-offset.jp2 -o @TEMP_PATH@/issue427-illegal-tile-offset.jp2.pgx
# issue 458 component precision upscaling
opj_decompress -i @INPUT_NR_PATH@/issue458.jp2 -o @TEMP_PATH@/issue458.jp2.pgx
# decode with specific area
# prec=12; nb_c=1