diff options
Diffstat (limited to 'indra/llimagej2coj')
| -rw-r--r-- | indra/llimagej2coj/llimagej2coj.cpp | 59 |
1 files changed, 50 insertions, 9 deletions
diff --git a/indra/llimagej2coj/llimagej2coj.cpp b/indra/llimagej2coj/llimagej2coj.cpp index b2bd3186a0..f4bcb97a5d 100644 --- a/indra/llimagej2coj/llimagej2coj.cpp +++ b/indra/llimagej2coj/llimagej2coj.cpp @@ -431,23 +431,20 @@ public: opj_set_default_encoder_parameters(¶meters); parameters.cod_format = OPJ_CODEC_J2K; parameters.cp_disto_alloc = 1; - parameters.max_cs_size = (1 << 15); if (reversible) { + parameters.max_cs_size = 0; // do not limit size for reversible compression + parameters.irreversible = 0; // should be the default, but, just in case parameters.tcp_numlayers = 1; - parameters.tcp_rates[0] = 1.0f; + /* documentation seems to be wrong, should be 0.0f for lossless, not 1.0f + see https://github.com/uclouvain/openjpeg/blob/39e8c50a2f9bdcf36810ee3d41bcbf1cc78968ae/src/lib/openjp2/j2k.c#L7755 + */ + parameters.tcp_rates[0] = 0.0f; } else { - parameters.tcp_numlayers = 5; - parameters.tcp_rates[0] = 1920.0f; - parameters.tcp_rates[1] = 960.0f; - parameters.tcp_rates[2] = 480.0f; - parameters.tcp_rates[3] = 120.0f; - parameters.tcp_rates[4] = 30.0f; parameters.irreversible = 1; - parameters.tcp_mct = 1; } if (comment_text) @@ -501,6 +498,50 @@ public: parameters.prog_order = OPJ_RLCP; parameters.cp_disto_alloc = 1; + // if not lossless compression, computes tcp_numlayers and max_cs_size depending on the image dimensions + if( parameters.irreversible ) { + + // computes a number of layers + U32 surface = rawImageIn.getWidth() * rawImageIn.getHeight(); + U32 nb_layers = 1; + U32 s = 64*64; + while (surface > s) + { + nb_layers++; + s *= 4; + } + nb_layers = llclamp(nb_layers, 1, 6); + + parameters.tcp_numlayers = nb_layers; + parameters.tcp_rates[nb_layers - 1] = (U32)(1.f / DEFAULT_COMPRESSION_RATE); // 1:8 by default + + // for each subsequent layer, computes its rate and adds surface * numcomps * 1/rate to the max_cs_size + U32 max_cs_size = (U32)(surface * image->numcomps * DEFAULT_COMPRESSION_RATE); + U32 multiplier; + for (int i = nb_layers - 2; i >= 0; i--) + { + if( i == nb_layers - 2 ) + { + multiplier = 15; + } + else if( i == nb_layers - 3 ) + { + multiplier = 4; + } + else + { + multiplier = 2; + } + parameters.tcp_rates[i] = parameters.tcp_rates[i + 1] * multiplier; + max_cs_size += (U32)(surface * image->numcomps * (1 / parameters.tcp_rates[i])); + } + + //ensure that we have at least a minimal size + max_cs_size = llmax(max_cs_size, (U32)FIRST_PACKET_SIZE); + + parameters.max_cs_size = max_cs_size; + } + if (!opj_setup_encoder(encoder, ¶meters, image)) { return false; |