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| Known bugs and suggested enhancements in libpng-1.0.2 |
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| 1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey |
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| Loops need to be optimized everywhere |
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| Make them count down instead of up -- Kevin Bracey |
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| Optimizing compilers don't need this, and making |
| the change would be error prone -- Tom Lane, Glenn R-P |
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| Question whether i-- or --i is better. |
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| STATUS: Under investigation, postponed until after |
| libpng-1.0.2. About 160 loops will be turned around |
| in libpng-1.0.Nn, for testing. |
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| 2. June 15, 1998 -- BUG -- Evan Light |
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| Under some conditions, 16-bit grayscale images aren't properly |
| expanded to rgb, because png_read_start_row() returns too small a |
| value of max_pixel_depth when png_set_filler() has also been called. |
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| STATUS: Fixed in libpng-1.0.2a |
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| 3. June 16, 1998 -- BUG -- Matt McConnell |
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| When reading interlaced images with a progressive reader, in some |
| cases (interlaced images less than 3 pixels high) some passes are |
| not skipped that should be. |
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| STATUS: Fixed in libpng-1.0.2a |
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| 4. July 3, 1998 -- ENHANCEMENT -- Glenn R-P |
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| Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions. |
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| STATUS: Done in libpng-1.0.2a, awaiting comment on resulting test |
| images. |
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| 5. July 4, 1998 -- ENHANCEMENT -- Glenn R-P |
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| libpng-1.0.2 and earlier transform colors to gamma=1.0 space for |
| merging with background, and then back to the image's gamma. The |
| bit_depth of the intermediate (gamma=1.0) representation is probably |
| not sufficient. In the typical gamma=1/2.2 situation, the linear |
| pixels need about 4 more bits than the gamma-encoded ones, to avoid |
| loss of precision. A similar situation exists with the rgb_to_gray |
| operation. |
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| STATUS: under development. |
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| 6. August 20, 1998 -- BUG -- Kevin Bracey |
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| When using the filler transformation, the filler isn't written |
| into the leftmost pixel of each row. |
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| Also, the filler operation isn't being done right when writing |
| files. Some code that was removed from png_set_filler() in |
| libpng 1.0.1a shouldn't have been removed. |
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| STATUS: Fixed in libpng-1.0.2a |
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| 7. August 23, 1998 -- BUG -- Duncan Simpson |
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| "static pngcharp tIME_string" should be changed to |
| "static char tIME_string[30]" in pngtest.c |
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| Also -- December 30, 1998 -- there are some misplaced brackets in |
| pngtest.c that cause pngtest to try to write a tIME chunk |
| even when no tIME chunk was present in the source file. |
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| STATUS: Fixed in libpng-1.0.2a |
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| 8. August 24, 1998 -- BUG -- John Cromer |
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| Order of byte-swap and shift operations seems to be incorrect in |
| png_do_write_transformations() |
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| STATUS: Under investigation. |
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| 9. September 11, 1998 -- ENHANCEMENT -- L. Peter Deutsch |
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| The PNG_NO_STDIO macro should be split into PNG_NO_STDIO |
| and PNG_NO_CONSOLE_STDIO. |
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| STATUS: Done in libpng-1.0.2a |
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