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#include "closure.h"
#include "Canvas.h"

#ifdef HAVE_JPEG
void JpegClosure::init_destination(j_compress_ptr cinfo) {
  JpegClosure* closure = (JpegClosure*)cinfo->client_data;
  closure->vec.resize(PAGE_SIZE);
  closure->jpeg_dest_mgr->next_output_byte = &closure->vec[0];
  closure->jpeg_dest_mgr->free_in_buffer = closure->vec.size();
}

boolean JpegClosure::empty_output_buffer(j_compress_ptr cinfo) {
  JpegClosure* closure = (JpegClosure*)cinfo->client_data;
  size_t currentSize = closure->vec.size();
  closure->vec.resize(currentSize * 1.5);
  closure->jpeg_dest_mgr->next_output_byte = &closure->vec[currentSize];
  closure->jpeg_dest_mgr->free_in_buffer = closure->vec.size() - currentSize;
  return true;
}

void JpegClosure::term_destination(j_compress_ptr cinfo) {
  JpegClosure* closure = (JpegClosure*)cinfo->client_data;
  size_t finalSize = closure->vec.size() - closure->jpeg_dest_mgr->free_in_buffer;
  closure->vec.resize(finalSize);
}
#endif

void
EncodingWorker::Init(void (*work_fn)(Closure*), Closure* closure) {
  this->work_fn = work_fn;
  this->closure = closure;
}

void
EncodingWorker::Execute() {
  this->work_fn(this->closure);
}

void
EncodingWorker::OnWorkComplete(Napi::Env env, napi_status status) {
  Napi::HandleScope scope(env);

  if (closure->status) {
    closure->cb.Call({ closure->canvas->CairoError(closure->status).Value() });
  } else {
    Napi::Object buf = Napi::Buffer<uint8_t>::Copy(env, &closure->vec[0], closure->vec.size());
    closure->cb.Call({ env.Null(), buf });
  }

  closure->canvas->Unref();
  delete closure;
}