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Rename av_fill_image_linesizes() internal variables max_plane_step and

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max_plane_step_comp by removing the "plane_" word, and add a comment
for explaining what they represent.

Increase readability.

Originally committed as revision 24588 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-07-30 08:42:12 +00:00
parent fc2db52e2f
commit 7860b43651
1 changed files with 9 additions and 9 deletions
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18
libavcore/imgutils.c
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@ -28,8 +28,8 @@ int av_fill_image_linesizes(int linesize[4], enum PixelFormat pix_fmt, int width
{
int i;
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
int max_plane_step [4];
int max_plane_step_comp[4];
int max_step [4]; /* max pixel step for each plane */
int max_step_comp[4]; /* the component for each plane which has the max pixel step */
memset(linesize, 0, 4*sizeof(linesize[0]));
@ -41,19 +41,19 @@ int av_fill_image_linesizes(int linesize[4], enum PixelFormat pix_fmt, int width
return 0;
}
memset(max_plane_step , 0, sizeof(max_plane_step ));
memset(max_plane_step_comp, 0, sizeof(max_plane_step_comp));
memset(max_step , 0, sizeof(max_step ));
memset(max_step_comp, 0, sizeof(max_step_comp));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(desc->comp[i]);
if ((comp->step_minus1+1) > max_plane_step[comp->plane]) {
max_plane_step [comp->plane] = comp->step_minus1+1;
max_plane_step_comp[comp->plane] = i;
if ((comp->step_minus1+1) > max_step[comp->plane]) {
max_step [comp->plane] = comp->step_minus1+1;
max_step_comp[comp->plane] = i;
}
}
for (i = 0; i < 4; i++) {
int s = (max_plane_step_comp[i] == 1 || max_plane_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
linesize[i] = max_plane_step[i] * (((width + (1 << s) - 1)) >> s);
int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
linesize[i] = max_step[i] * (((width + (1 << s) - 1)) >> s);
}
return 0;