size_t SkPictureRecord::recordRestoreOffsetPlaceholder(SkRegion::Op op) {
if (fRestoreOffsetStack.isEmpty()) {
return -1;
}
// The RestoreOffset field is initially filled with a placeholder
// value that points to the offset of the previous RestoreOffset
// in the current stack level, thus forming a linked list so that
// the restore offsets can be filled in when the corresponding
// restore command is recorded.
int32_t prevOffset = fRestoreOffsetStack.top();
if (regionOpExpands(op)) {
// Run back through any previous clip ops, and mark their offset to
// be 0, disabling their ability to trigger a jump-to-restore, otherwise
// they could hide this clips ability to expand the clip (i.e. go from
// empty to non-empty).
this->fillRestoreOffsetPlaceholdersForCurrentStackLevel(0);
// Reset the pointer back to the previous clip so that subsequent
// restores don't overwrite the offsets we just cleared.
prevOffset = 0;
}
size_t offset = fWriter.bytesWritten();
this->addInt(prevOffset);
fRestoreOffsetStack.top() = SkToU32(offset);
return offset;
}
void SkPictureRecord::recordOffsetForRestore(SkRegion::Op op) {
if (regionOpExpands(op)) {
// Run back through any previous clip ops, and mark their offset to
// be 0, disabling their ability to trigger a jump-to-restore, otherwise
// they could hide this clips ability to expand the clip (i.e. go from
// empty to non-empty).
uint32_t offset = fRestoreOffsetStack.top();
while (offset) {
uint32_t* peek = fWriter.peek32(offset);
offset = *peek;
*peek = 0;
}
}
size_t offset = fWriter.size();
addInt(fRestoreOffsetStack.top());
fRestoreOffsetStack.top() = offset;
}
void SkPictureRecord::recordRestoreOffsetPlaceholder(SkRegion::Op op) {
if (fRestoreOffsetStack.isEmpty()) {
return;
}
if (regionOpExpands(op)) {
// Run back through any previous clip ops, and mark their offset to
// be 0, disabling their ability to trigger a jump-to-restore, otherwise
// they could hide this clips ability to expand the clip (i.e. go from
// empty to non-empty).
fillRestoreOffsetPlaceholdersForCurrentStackLevel(0);
}
size_t offset = fWriter.size();
// The RestoreOffset field is initially filled with a placeholder
// value that points to the offset of the previous RestoreOffset
// in the current stack level, thus forming a linked list so that
// the restore offsets can be filled in when the corresponding
// restore command is recorded.
addInt(fRestoreOffsetStack.top());
fRestoreOffsetStack.top() = offset;
}