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-rw-r--r--gfx/thebes/PrintTargetPDF.cpp94
1 files changed, 94 insertions, 0 deletions
diff --git a/gfx/thebes/PrintTargetPDF.cpp b/gfx/thebes/PrintTargetPDF.cpp
new file mode 100644
index 0000000000..fd60812f5c
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+++ b/gfx/thebes/PrintTargetPDF.cpp
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+/* -*- 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()) {
+ creatorName.Append(u" " MOZILLA_VERSION);
+ 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