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Extend color syntax, make it accept an alpha component specifier.

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Originally committed as revision 23835 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini
2010-06-27 22:35:35 +00:00
parent 8e094dd667
commit a52e2c3a46
2 changed files with 62 additions and 8 deletions
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10
libavfilter/parseutils.h
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@@ -46,7 +46,15 @@ char *av_get_token(const char **buf, const char *term);
* Puts the RGBA values that correspond to color_string in rgba_color.
*
* @param color_string a string specifying a color. It can be the name of
* a color (case insensitive match) or a 0xRRGGBB[AA] sequence.
* a color (case insensitive match) or a 0xRRGGBB[AA] sequence,
* possibly followed by "@" and a string representing the alpha
* component.
* The alpha component may be a string composed by "0x" followed by an
* hexadecimal number or a base-10 number between 0 and 255, or a
* decimal number between 0.0 and 1.0, which represents the opacity
* value (0/0x00/0.0 means completely transparent, 255/0xff/1.0
* completely opaque).
* If the alpha component is not specified then 255 is assumed.
* The string "random" will result in a random color.
* @return >= 0 in case of success, a negative value in case of
* failure (for example if color_string cannot be parsed).