1 files changed, 93 insertions, 0 deletions
diff --git a/gfx/thebes/PrintTargetPDF.cpp b/gfx/thebes/PrintTargetPDF.cpp
new file mode 100644
index 0000000000..8c2910f9e0
--- /dev/null
+++ b/gfx/thebes/PrintTargetPDF.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PrintTargetPDF.h"
+
+#include "cairo.h"
+#include "cairo-pdf.h"
+#include "mozilla/AppShutdown.h"
+#include "nsContentUtils.h"
+#include "nsString.h"
+
+namespace mozilla::gfx {
+
+static cairo_status_t write_func(void* closure, const unsigned char* data,
+                                 unsigned int length) {
+  if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+    return CAIRO_STATUS_SUCCESS;
+  }
+  nsCOMPtr<nsIOutputStream> out = reinterpret_cast<nsIOutputStream*>(closure);
+  do {
+    uint32_t wrote = 0;
+    if (NS_FAILED(out->Write((const char*)data, length, &wrote))) {
+      break;
+    }
+    data += wrote;
+    length -= wrote;
+  } while (length > 0);
+  NS_ASSERTION(length == 0, "not everything was written to the file");
+  return CAIRO_STATUS_SUCCESS;
+}
+
+PrintTargetPDF::PrintTargetPDF(cairo_surface_t* aCairoSurface,
+                               const IntSize& aSize, nsIOutputStream* aStream)
+    : PrintTarget(aCairoSurface, aSize), mStream(aStream) {}
+
+PrintTargetPDF::~PrintTargetPDF() {
+  // We get called first, then PrintTarget's dtor.  That means that mStream
+  // is destroyed before PrintTarget's dtor calls cairo_surface_destroy.  This
+  // can be a problem if Finish() hasn't been called on us, since
+  // cairo_surface_destroy will then call cairo_surface_finish and that will
+  // end up invoking write_func above with the by now dangling pointer mStream
+  // that mCairoSurface stored.  To prevent that from happening we must call
+  // Flush here before mStream is deleted.
+  Finish();
+}
+
+/* static */
+already_AddRefed<PrintTargetPDF> PrintTargetPDF::CreateOrNull(
+    nsIOutputStream* aStream, const IntSize& aSizeInPoints) {
+  if (NS_WARN_IF(!aStream)) {
+    return nullptr;
+  }
+
+  cairo_surface_t* surface = cairo_pdf_surface_create_for_stream(
+      write_func, (void*)aStream, aSizeInPoints.width, aSizeInPoints.height);
+  if (cairo_surface_status(surface)) {
+    return nullptr;
+  }
+
+  nsAutoString creatorName;
+  if (NS_SUCCEEDED(nsContentUtils::GetLocalizedString(
+          nsContentUtils::eBRAND_PROPERTIES, "brandFullName", creatorName)) &&
+      !creatorName.IsEmpty()) {
+    cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_CREATOR,
+                                   NS_ConvertUTF16toUTF8(creatorName).get());
+  }
+
+  // The new object takes ownership of our surface reference.
+  RefPtr<PrintTargetPDF> target =
+      new PrintTargetPDF(surface, aSizeInPoints, aStream);
+  return target.forget();
+}
+
+nsresult PrintTargetPDF::EndPage() {
+  cairo_surface_show_page(mCairoSurface);
+  return PrintTarget::EndPage();
+}
+
+void PrintTargetPDF::Finish() {
+  if (mIsFinished ||
+      AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+    // We don't want to call Close() on mStream more than once, and we don't
+    // want to block shutdown if for some reason the user shuts down the
+    // browser mid print.
+    return;
+  }
+  PrintTarget::Finish();
+  mStream->Close();
+}
+
+}  // namespace mozilla::gfx