Alexandre Julliard pushed to branch master at wine / wine

Commits:

• c2f57082
  by Zhengyong Chen at 2026-06-17T23:04:42+02:00

  windowscodecs: Decode GIF frames on demand.
  
  The GIF decoder currently calls DGifSlurp() during initialization,
  which decodes and stores pixel data for every frame in the image.
  
  For animated GIFs with a large number of frames this can result in
  significant startup time and memory consumption, even when only a
  single frame is requested by the application.
  
  Change the decoder to scan GIF headers during initialization and defer
  frame pixel decoding until CopyPixels() is called for a specific frame.
  This avoids eagerly decoding unused frames while preserving existing
  decoder behavior.
  
  Signed-off-by: chenzhengyong <chenzhengyong@uniontech.com>
  

3 changed files:

• dlls/windowscodecs/gifformat.c
• dlls/windowscodecs/ungif.c
• dlls/windowscodecs/ungif.h