EXP-664 : Make encoding parameters more resilient to bad entries, add levels as encoding parameters, update test applet to support this

1 files changed, 13 insertions, 0 deletions

diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index 18444f3934..c464c3b2b6 100644
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -35,8 +35,21 @@
 
 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;