diff options
Diffstat (limited to 'indra/llkdu')
| -rw-r--r-- | indra/llkdu/llimagej2ckdu.cpp | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/indra/llkdu/llimagej2ckdu.cpp b/indra/llkdu/llimagej2ckdu.cpp index 53d2a2f3c5..cf88de12b4 100644 --- a/indra/llkdu/llimagej2ckdu.cpp +++ b/indra/llkdu/llimagej2ckdu.cpp @@ -609,13 +609,6 @@ BOOL LLImageJ2CKDU::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, co llassert (base.mRate > 0.f); max_bytes = (U32)((F32)(max_bytes) * base.mRate); - // If the image is very small, code it in a lossless way. - // Note: it'll also have only 1 layer which is fine as there's no point reordering blocks in that case. - if (max_bytes < FIRST_PACKET_SIZE) - { - reversible = true; - } - // This code is where we specify the target number of bytes for each quality layer. // We're using a logarithmic spacing rule that fits with our way of fetching texture data. // Note: For more info on this layers business, read kdu_codestream::flush() doc in kdu_compressed.h @@ -626,27 +619,32 @@ BOOL LLImageJ2CKDU::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, co layer_bytes[nb_layers++] = i; i *= 4; } + // Note: for small images, we can have (max_bytes < FIRST_PACKET_SIZE), hence the test if (layer_bytes[nb_layers-1] < max_bytes) { - // Set the last quality layer if necessary so to fit the preset compression ratio - // Use 0 for that last layer for reversible images so all remaining code blocks will be flushed - layer_bytes[nb_layers++] = (reversible ? 0 : max_bytes); + // Set the last quality layer so to fit the preset compression ratio + layer_bytes[nb_layers++] = max_bytes; } if (reversible) { + // Use 0 for a last quality layer for reversible images so all remaining code blocks will be flushed + // Hack: KDU encoding for reversible images has a bug for small images that leads to j2c images that + // cannot be open or are very blurry. Avoiding that last layer prevents the problem to happen. + if ((base.getWidth() >= 32) || (base.getHeight() >= 32)) + { + layer_bytes[nb_layers++] = 0; + } codestream.access_siz()->parse_string("Creversible=yes"); // *TODO: we should use yuv in reversible mode // Don't turn this on now though as it creates problems on decoding for the moment //codestream.access_siz()->parse_string("Cycc=no"); } - + std::string layer_string = llformat("Clayers=%d",nb_layers); codestream.access_siz()->parse_string(layer_string.c_str()); // Set up data ordering, markers, etc... if precincts or blocks specified - // Note: This code is *not* used in the encoding made by the viewer. It is currently used only - // by llimage_libtest to create various j2c and test alternative compression schemes. if ((mBlocksSize != -1) || (mPrecinctsSize != -1)) { if (mPrecinctsSize != -1) |