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Implement a write_line() function.

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Originally committed as revision 18646 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2009-04-21 19:15:21 +00:00
parent fd548e5bd6
commit 9401d18fa5
1 changed files with 51 additions and 0 deletions
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51
libavcodec/pixdesc.h
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@ -137,3 +137,54 @@ static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int li
}
}
}
/**
* Writes the values from src to the pixel format component c of an
* image line.
*
* @param src array containing the values to write
* @param data the array containing the pointers to the planes of the
* image to write into. It is supposed to be zeroed.
* @param linesizes the array containing the linesizes of the image
* @param desc the pixel format descriptor for the image
* @param x the horizontal coordinate of the first pixel to write
* @param y the vertical coordinate of the first pixel to write
* @param w the width of the line to write, that is the number of
* values to write to the image line
*/
static inline void write_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
{
AVComponentDescriptor comp = desc->comp[c];
int plane = comp.plane;
int depth = comp.depth_minus1+1;
int step = comp.step_minus1+1;
int flags = desc->flags;
if (flags & PIX_FMT_BITSTREAM) {
int skip = x*step + comp.offset_plus1-1;
uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
int shift = 8 - depth - (skip&7);
while (w--) {
*p |= *src++ << shift;
shift -= step;
p -= shift>>3;
shift &= 7;
}
} else {
int shift = comp.shift;
uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
while (w--) {
if (flags & PIX_FMT_BE) {
uint16_t val = AV_RB16(p) | (*src++<<shift);
AV_WB16(p, val);
} else {
uint16_t val = AV_RL16(p) | (*src++<<shift);
AV_WL16(p, val);
}
p+= step;
}
}
}