[Ffmpeg-devel] [PATCH] watermark.c optimizations for single-frameinput (previous patch included)

[Mihail Stoyanov]

Resending the patch with fixed tabs and some more optimizations suggested by 
Michael Niedermayer.

There is 1 more addition. There's new command line option "-c".

Quote watermark.c

 * The pixel calculation formula in the default case (without -c) is:
 * new_pixel_color = orig_pixel_color + (water_mark_image_color - threshold)
 * It is applied to Red, Green, Blue channels.
 * Using the -c changes the formula to:
 * new_pixel_color = orig_pixel_color + (water_mark_image_color - threshold)
 *    + ((orig_pixel_color - threshold) * contrast_percent)
 * In that way you have control over the difference between the movie source
 * (a.k.a "orig") pixel color and the threshold (or contrast)
 * If using the default threshold (without -t) the -c switch is similar to
 * applying contrast ONLY over that watermark pixels that aren't equal to 
the
 * threashold (like contast-mask).
 * When using positive values for -c, the dark pixels of the movie source 
will
 * become even more dark, the light ones will become even more light.
 * When using negative values for -c, the dark pixels of the movie source 
will
 * become more light, the light ones will become even more dark.
 * Note that the -l switch is in percents (-100 to 100)


Cheers


----- Original Message ----- 
From: "Mihail Stoyanov" <screamer at data.bg>
To: "FFmpeg development discussions and patches" <ffmpeg-devel at mplayerhq.hu>
Sent: Friday, October 20, 2006 4:41 PM
Subject: [Ffmpeg-devel] [PATCH] watermark.c optimizations for 
single-frameinput (previous patch included)


> This patch optimizes watermark.c in 2 ways
> 1. Checks if the current pixel RGB (of the input image) is equal to the
> threshold before doing any other calculations, thus skipping useless
> itterations.
>
> 2. When using single-frame watermark input...
> [cut]
> 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: watermark_mod3.patch
Type: application/octet-stream
Size: 12756 bytes
Desc: not available
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20061021/fef452bd/attachment.obj>