/* -*- 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