diff options
Diffstat (limited to 'libavcodec/dsputil.c')
-rw-r--r-- | libavcodec/dsputil.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c index 9e69bf7..cfe3666 100644 --- a/libavcodec/dsputil.c +++ b/libavcodec/dsputil.c @@ -457,6 +457,77 @@ static void draw_edges_c(uint8_t *buf, int wrap, int width, int height, int w) } } +/** + * Copies a rectangular area of samples to a temporary buffer and replicates the boarder samples. + * @param buf destination buffer + * @param src source buffer + * @param linesize number of bytes between 2 vertically adjacent samples in both the source and destination buffers + * @param block_w width of block + * @param block_h height of block + * @param src_x x coordinate of the top left sample of the block in the source buffer + * @param src_y y coordinate of the top left sample of the block in the source buffer + * @param w width of the source buffer + * @param h height of the source buffer + */ +void ff_emulated_edge_mc(uint8_t *buf, uint8_t *src, int linesize, int block_w, int block_h, + int src_x, int src_y, int w, int h){ + int x, y; + int start_y, start_x, end_y, end_x; + + if(src_y>= h){ + src+= (h-1-src_y)*linesize; + src_y=h-1; + }else if(src_y<=-block_h){ + src+= (1-block_h-src_y)*linesize; + src_y=1-block_h; + } + if(src_x>= w){ + src+= (w-1-src_x); + src_x=w-1; + }else if(src_x<=-block_w){ + src+= (1-block_w-src_x); + src_x=1-block_w; + } + + start_y= FFMAX(0, -src_y); + start_x= FFMAX(0, -src_x); + end_y= FFMIN(block_h, h-src_y); + end_x= FFMIN(block_w, w-src_x); + + // copy existing part + for(y=start_y; y<end_y; y++){ + for(x=start_x; x<end_x; x++){ + buf[x + y*linesize]= src[x + y*linesize]; + } + } + + //top + for(y=0; y<start_y; y++){ + for(x=start_x; x<end_x; x++){ + buf[x + y*linesize]= buf[x + start_y*linesize]; + } + } + + //bottom + for(y=end_y; y<block_h; y++){ + for(x=start_x; x<end_x; x++){ + buf[x + y*linesize]= buf[x + (end_y-1)*linesize]; + } + } + + for(y=0; y<block_h; y++){ + //left + for(x=0; x<start_x; x++){ + buf[x + y*linesize]= buf[start_x + y*linesize]; + } + + //right + for(x=end_x; x<block_w; x++){ + buf[x + y*linesize]= buf[end_x - 1 + y*linesize]; + } + } +} + static void get_pixels_c(DCTELEM *restrict block, const uint8_t *pixels, int line_size) { int i; |