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author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-08-18 21:02:38 +0000 |
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committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-08-18 21:02:38 +0000 |
commit | a6ddf8bf0f270fd2f609efb93416374fbb4c4430 (patch) | |
tree | 5aabcf33b33c7950a25aa603e40a4da10bacae91 /libavcore/imgutils.h | |
parent | 25ae798c87dd2b42f277155f721e84be92425f1e (diff) | |
download | ffmpeg-streaming-a6ddf8bf0f270fd2f609efb93416374fbb4c4430.zip ffmpeg-streaming-a6ddf8bf0f270fd2f609efb93416374fbb4c4430.tar.gz |
Implement inline function av_fill_image_max_pixstep() and use it for
factorizing code.
Originally committed as revision 24827 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcore/imgutils.h')
-rw-r--r-- | libavcore/imgutils.h | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/libavcore/imgutils.h b/libavcore/imgutils.h index c2cf6eb..874bef1 100644 --- a/libavcore/imgutils.h +++ b/libavcore/imgutils.h @@ -24,10 +24,44 @@ * misc image utilities */ -#include "libavutil/pixfmt.h" +#include "libavutil/pixdesc.h" #include "avcore.h" /** + * Compute the max pixel step for each plane of an image with a + * format described by pixdesc + * + * The pixel step is the distance in bytes between the first byte of + * the group of bytes which describe a pixel component and the first + * byte of the successive group in the same plane for the same + * component. + * + * @param max_pixstep an array which is filled with the max pixel step + * for each plane. Since a plane may contain different pixel + * components, the computed max_pixstep[plane] is relative to the + * component in the plane with the max pixel step. + * @param max_pixstep_comp an array which is filled with the component + * for each plane which has the max pixel step. May be NULL. + */ +static inline void av_fill_image_max_pixstep(int max_pixstep[4], int max_pixstep_comp[4], + const AVPixFmtDescriptor *pixdesc) +{ + int i; + memset(max_pixstep, 0, 4*sizeof(max_pixstep[0])); + if (max_pixstep_comp) + memset(max_pixstep_comp, 0, 4*sizeof(max_pixstep_comp[0])); + + for (i = 0; i < 4; i++) { + const AVComponentDescriptor *comp = &(pixdesc->comp[i]); + if ((comp->step_minus1+1) > max_pixstep[comp->plane]) { + max_pixstep[comp->plane] = comp->step_minus1+1; + if (max_pixstep_comp) + max_pixstep_comp[comp->plane] = i; + } + } +} + +/** * Compute the size of an image line with format pix_fmt and width * width for the plane plane. * |