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src/Source/LibWebP/src/enc/backward_references.h  view on Meta::CPAN

// Cursor for iterating on references content
typedef struct {
  // public:
  PixOrCopy* cur_pos;           // current position
  // private:
  PixOrCopyBlock* cur_block_;   // current block in the refs list
  const PixOrCopy* last_pos_;   // sentinel for switching to next block
} VP8LRefsCursor;

// Returns a cursor positioned at the beginning of the references list.
VP8LRefsCursor VP8LRefsCursorInit(const VP8LBackwardRefs* const refs);
// Returns true if cursor is pointing at a valid position.
static WEBP_INLINE int VP8LRefsCursorOk(const VP8LRefsCursor* const c) {
  return (c->cur_pos != NULL);
}
// Move to next block of references. Internal, not to be called directly.
void VP8LRefsCursorNextBlock(VP8LRefsCursor* const c);
// Move to next position, or NULL. Should not be called if !VP8LRefsCursorOk().
static WEBP_INLINE void VP8LRefsCursorNext(VP8LRefsCursor* const c) {
  assert(c != NULL);
  assert(VP8LRefsCursorOk(c));
  if (++c->cur_pos == c->last_pos_) VP8LRefsCursorNextBlock(c);