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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/thebes/PrintTargetPDF.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/thebes/PrintTargetPDF.cpp')
-rw-r--r--gfx/thebes/PrintTargetPDF.cpp85
1 files changed, 85 insertions, 0 deletions
diff --git a/gfx/thebes/PrintTargetPDF.cpp b/gfx/thebes/PrintTargetPDF.cpp
new file mode 100644
index 000000000..ce536c07f
--- /dev/null
+++ b/gfx/thebes/PrintTargetPDF.cpp
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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"
+
+namespace mozilla {
+namespace gfx {
+
+static cairo_status_t
+write_func(void *closure, const unsigned char *data, unsigned int length)
+{
+ 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)
+{
+ 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;
+ }
+
+ // 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 NS_OK;
+}
+
+void
+PrintTargetPDF::Finish()
+{
+ if (mIsFinished) {
+ return; // We don't want to call Close() on mStream more than once
+ }
+ PrintTarget::Finish();
+ mStream->Close();
+}
+
+} // namespace gfx
+} // namespace mozilla