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+Known bugs and suggested enhancements in libpng-1.0.1
+
+1. March 13, 1998 -- BUG -- pngtrans.c:
+
+ row_info->channels should be updated --
+ row_info->color_type should be updated --
+
+ STATUS: I think this is all fixed in libpng-1.0.1a but needs
+ to be tested.
+
+2. March 14, 1998 -- ENHANCEMENT -- Glenn
+
+ We should add the G>GA, G>GX, G>AG, and G>XG transformations
+ in png_do_read_filler()
+
+ STATUS: Implemented in libpng-1.0.1a
+
+3. March 14, 1998 -- BUG? -- Greg Roelofs
+
+ pngrtran.c: if-test for channels/FILLER may be incorrect
+
+ STATUS: Under investigation
+
+4. March 15, 1998 -- BUG -- Kevin Bracey
+
+ pngwtran.c:
+ line 306: loop should count to row_info->width, not to
+ row_info->width*row_info->channnels
+
+ STATUS: Fixed in libpng-1.0.1a
+
+5. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
+
+ Loops need to be optimized everywhere
+
+ a. Make them count down instead of up -- Kevin Bracey
+
+ Optimizing compilers don't need this, and making
+ the change would be error prone -- Tom Lane, Glenn R-P
+
+ Question whether i-- or --i is better.
+
+ STATUS: Under investigation.
+
+ b. Remove products and structure members from loop tests -- Glenn R-P
+
+ Can be accomplished without messing with loop guts. This
+ was shown to be effective on optimized SGI compiler:
+
+ replace
+ png_uint_32 i;
+ for(i=0; i < s->a*s->b; i++)
+ with
+ png_uint_32 i, count;
+ istop = s->a*s->b;
+ for(i=0; i<istop; i++)
+
+ STATUS: Mostly done in libpng-1.0.1a, done for all important loops.
+
+ c. Replace abs() with intrinsic ternary operations in Paeth
+ filtering -- Glenn R-P
+
+ STATUS: Done in libpng-1.0.1a
+ (can be restored to original behavior with #define PNG_USE_ABS)
+
+ d. In pngwutil.c, make separate simple loops to use when filter
+ heuristic sums aren't needed. -- Glenn R-P
+
+ STATUS: Done in libpng-1.0.1a
+
+6. April 6, 1998 -- BUG -- bug in pngset.c (rowbytes too large) -- Bob Dellaca
+
+ pngset.c has a bug, introduced in version 0.99c, that sets rowbytes
+ too large when writing an image with bit_depth < 8
+
+ STATUS: Fixed in libpng-1.0.1a
+
+7. April 10, 1998 -- BUG -- pngwutil weighted filtering bugs -- Glenn R-P
+
+ pngwutil.c has some bugs in the experimental weighted filter
+ algorithm (PNG_FILTER_XXX should be PNG_FILTER_VALUE_XXX in
+ several places)
+
+ STATUS: Andreas concurs. Fixed in libpng-1.0.1a
+
+8. April 10, 1998 -- ENHANCEMENT -- run-time selection of malloc function
+ -- Bob Dellaca
+
+ pngmem.c currently provides a compile-time option to replace
+ png_malloc() and png_free(). It's been requested that these
+ be made possible at run time, via calls to new png_set_malloc_fn()
+ and png_set_free_fn() functions.
+
+ STATUS: Will do in libpng-1.0.1b
+
+9. April 11, 1998 -- BUG -- incorrect truncation of tRNS data in
+ illegal PNG file where tRNS precedes PLTE -- Larry Reeve
+
+ There is a misplaced pngrutil code block that truncates tRNS if it has
+ more than num_palette entries -- test was done before num_palette was
+ defined. Although the PNG file is illegal, it shouldn't crash apps.
+ There is a simple fix; just moving the test to the point after
+ num_palette has been defined.
+
+ STATUS: Fixed in libpng-1.0.1a
+
+10. April 16, 1998 -- BUG -- incorrect operation of png_convert_to_rfc1123
+ with 31st day of the month -- Steve Eddins
+
+ The "ptime->date % 31" is wrong, should be "ptime->date % 32".
+
+ STATUS: Fixed in libpng-1.0.1a