diff options
Diffstat (limited to 'indra/llimage/llimagej2c.cpp')
| -rw-r--r-- | indra/llimage/llimagej2c.cpp | 29 |
1 files changed, 11 insertions, 18 deletions
diff --git a/indra/llimage/llimagej2c.cpp b/indra/llimage/llimagej2c.cpp index 0058b91b0f..4ec95bbcc3 100644 --- a/indra/llimage/llimagej2c.cpp +++ b/indra/llimage/llimagej2c.cpp @@ -31,7 +31,6 @@ #include "llmath.h" #include "llmemory.h" #include "llsd.h" -#include <boost/scoped_ptr.hpp> // Declare the prototype for this factory function here. It is implemented in // other files which define a LLImageJ2CImpl subclass, but only ONE static @@ -275,30 +274,24 @@ S32 LLImageJ2C::calcDataSizeJ2C(S32 w, S32 h, S32 comp, S32 discard_level, F32 r // For details about the equation used here, see https://wiki.lindenlab.com/wiki/THX1138_KDU_Improvements#Byte_Range_Study // Estimate the number of layers. This is consistent with what's done for j2c encoding in LLImageJ2CKDU::encodeImpl(). + constexpr S32 precision = 8; // assumed bitrate per component channel, might change in future for HDR support + constexpr S32 max_components = 4; // assumed the file has four components; three color and alpha S32 nb_layers = 1; - S32 surface = w*h; + const S32 surface = w*h; S32 s = 64*64; + S32 totalbytes = (S32)(s * max_components * precision * rate); // first level computed before loop while (surface > s) { + if (nb_layers <= (5 - discard_level)) + totalbytes += (S32)(s * max_components * precision * rate); nb_layers++; s *= 4; } - F32 layer_factor = 3.0f * (7 - llclamp(nb_layers,1,6)); - - // Compute w/pow(2,discard_level) and h/pow(2,discard_level) - w >>= discard_level; - h >>= discard_level; - w = llmax(w, 1); - h = llmax(h, 1); - - // Temporary: compute both new and old range and pick one according to the settings TextureNewByteRange - // *TODO: Take the old code out once we have enough tests done - S32 bytes; - S32 new_bytes = (S32) (sqrt((F32)(w*h))*(F32)(comp)*rate*1000.f/layer_factor); - S32 old_bytes = (S32)((F32)(w*h*comp)*rate); - bytes = (LLImage::useNewByteRange() && (new_bytes < old_bytes) ? new_bytes : old_bytes); - bytes = llmax(bytes, calcHeaderSizeJ2C()); - return bytes; + + totalbytes /= 8; // to bytes + totalbytes += calcHeaderSizeJ2C(); // header + + return totalbytes; } S32 LLImageJ2C::calcHeaderSize() |