diff options
Diffstat (limited to 'indra/llimage/llimage.h')
| -rw-r--r-- | indra/llimage/llimage.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h index 10621623ad..4469c9e860 100644 --- a/indra/llimage/llimage.h +++ b/indra/llimage/llimage.h @@ -34,8 +34,21 @@ const S32 MIN_IMAGE_MIP = 2; // 4x4, only used for expand/contract power of 2 const S32 MAX_IMAGE_MIP = 11; // 2048x2048 + +// *TODO : Use MAX_IMAGE_MIP as max discard level and modify j2c management so that the number +// of levels is read from the header's file, not inferred from its size. const S32 MAX_DISCARD_LEVEL = 5; +// JPEG2000 size constraints +// Those are declared here as they are germane to other image constraints used in the viewer +// and declared right here. Some come from the JPEG2000 spec, some conventions specific to SL. +const S32 MAX_DECOMPOSITION_LEVELS = 32; // Number of decomposition levels cannot exceed 32 according to jpeg2000 spec +const S32 MIN_DECOMPOSITION_LEVELS = 5; // the SL viewer will *crash* trying to decode images with fewer than 5 decomposition levels (unless image is small that is) +const S32 MAX_PRECINCT_SIZE = 2048; // No reason to be bigger than MAX_IMAGE_SIZE +const S32 MIN_PRECINCT_SIZE = 4; // Can't be smaller than MIN_BLOCK_SIZE +const S32 MAX_BLOCK_SIZE = 64; // Max total block size is 4096, hence 64x64 when using square blocks +const S32 MIN_BLOCK_SIZE = 4; // Min block dim is 4 according to jpeg2000 spec + const S32 MIN_IMAGE_SIZE = (1<<MIN_IMAGE_MIP); // 4, only used for expand/contract power of 2 const S32 MAX_IMAGE_SIZE = (1<<MAX_IMAGE_MIP); // 2048 const S32 MIN_IMAGE_AREA = MIN_IMAGE_SIZE * MIN_IMAGE_SIZE; @@ -272,13 +285,13 @@ public: // subclasses must return a prefered file extension (lowercase without a leading dot) virtual std::string getExtension() = 0; // calcHeaderSize() returns the maximum size of header; - // 0 indicates we don't know have a header and have to lead the entire file + // 0 indicates we don't have a header and have to read the entire file virtual S32 calcHeaderSize() { return 0; }; // calcDataSize() returns how many bytes to read to load discard_level (including header) virtual S32 calcDataSize(S32 discard_level); // calcDiscardLevelBytes() returns the smallest valid discard level based on the number of input bytes virtual S32 calcDiscardLevelBytes(S32 bytes); - // getRawDiscardLevel()by default returns mDiscardLevel, but may be overridden (LLImageJ2C) + // getRawDiscardLevel() by default returns mDiscardLevel, but may be overridden (LLImageJ2C) virtual S8 getRawDiscardLevel() { return mDiscardLevel; } BOOL load(const std::string& filename); |