GIF Overlap Libary

policy

• http://giflib.cvs.sourceforge.net/giflib/giflib/util/gifovly.c inspire
  • i want to commit modifyed gifovly.c as gifovlap.c
• GIF Overlap for PHP (gifovlap)

function

• image overlay likely gifovlty.c but GIF89a extended and overlay to overlap
  • no timeline overlay but image overlap
  • transparent overlapping
  • join GIF animation frame timeline

spec

• accept different frame count each GIF image
  • LCM frames animation generated.
• loop each frame count each GIF image

API

gifovlap_t *gifovlap_open(unsigned char *gif_data, int gif_data_len)
int gifovlap_stack(gifovlap_t *gifovlap, unsigned char *gif_data, int gif_data_len)
unsigned char *gifovlap_output(gifovlap_t *gifovlap, int *gif_data_len)
void gifovlap_close(gifovlap_t *gifovlap)

implementation

• split GIF image to frame
• all frame LCM calculation
• frame overlay with timeline t mod F{i} (t=timeline, F=frame count, i=image num)
• clip screen and dispose = true

relative

• giflib | GIF
• GIF Overlap for PHP (gifovlap)