PROGRAMMING_NOTES@099cbddc7907 (annotated)
PROGRAMMING_NOTES
Mon, 05 Dec 2005 21:46:47 +0000
- author
- Luke Schierer <lschiere@pidgin.im>
- date
- Mon, 05 Dec 2005 21:46:47 +0000
- changeset 12360
- 099cbddc7907
- parent 9619
- 2d8adb92f665
- child 16237
- 606a402fea87
- permissions
- -rw-r--r--
[gaim-migrate @ 14664]
Faceprint is concerned about 2 things:
1)some of the random colors are very close together.
as best we can tell, there are two ways to fix this
1a) for each proposed color, iterate the entire list of selected
colors, looking to ensure that it is not too close to any of them.
this is an O(n^2) operation, with n >= 220 (the current number of
colors we look for)
1b) iterate the entire set of possible colors, skipping ahead by some
guess (rather than iterating by 1). this is an O(n^3) operation,
where n is 65535/(whatever we skip ahead by). This is not only a
more expensive operation, but because of the nature of the color
list, it is not _necessarily_ going to yield more predictable
results, skipping ahead 5 (or any other number) does not necessarily
guarantee that you've skipped 5 very similar colors.
2) as you can see, either solution to #1 is potentially a resource hog.
#1a is a random delay, #1b is inherently expensive. How often #1a will
exceed the bound #1b, if ever, is unknown.
rather than doing either of these, we settled on a middle course: a .h
file has been created containing a set of colors. currently the set we
were previously hard coded to. Gaim will search that list for usable
colors and start randomly looking only if that list does not contain
sufficient usable colors. ideally this list would be generated to have
colors that are known to be a "safe" distance appart, that is colors that
you can tell appart. and Ideally it would have a (small) multiple of the
number of colors we are searching for. This should ensure that IF we go
to randomly searching, we need do so only for a few colors.
Right now I have no good way to generate a "safe" list of colors though.
| 3630 | 1 | Notes on keeping GAIM OS independant |
| 2 | ------------------------------------ | |
| 3 | ||
| 4 | General | |
| 5 | ------- | |
| 6 | - Use G_DIR_SEPARATOR_S and G_DIR_SEPARATOR for paths | |
| 7 | ||
| 8 | - Use g_getenv, g_snprintf, g_vsnprintf | |
| 9 | ||
| 10 | - Use gaim_home_dir instead of g_get_home_dir or g_getenv("HOME") | |
| 11 | ||
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12 | - Make sure when including win32dep.h that it is the last header to |
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13 | be included. |
| 3630 | 14 | |
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15 | - Open binary files when reading or writing with 'b' mode. |
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16 | |
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17 | e.g: fopen("somefile", "wb"); |
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18 | |
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19 | Not doing so will open files in windows using defaut translation mode. |
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20 | i.e. newline -> <CR><LF> |
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21 | |
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22 | Paths |
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23 | ----- |
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24 | |
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25 | - DATADIR, LOCALEDIR & LIBDIR are defined in wingaim as functions. |
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26 | Doing the following will therefore break the windows build: |
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27 | |
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28 | printf("File in DATADIR is: %s\n", DATADIR G_DIR_SEPARATOR_S "pic.png"); |
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29 | |
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30 | it should be: |
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Herman Bloggs <herman@bluedigits.com>
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31 | |
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32 | printf("File in DATADIR is: %s%s%s\n", DATADIR, G_DIR_SEPARATOR_S, "pic.png"); |
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33 | |
| 3630 | 34 | PLUGINS & PROTOS |
| 35 | ---------------- | |
| 36 | ||
| 37 | - G_MODULE_EXPORT all functions which are to be accessed from outside the | |
| 38 | scope of its "dll" or "so". (E.G. gaim_plugin_init) | |
| 39 | ||
| 40 | - G_MODULE_IMPORT all global variables which are located outside your | |
| 41 | dynamic library. (E.G. connections) | |
| 42 | ||
| 43 | (Not doing this will cause "Memory Access Violations" in Win32) |
