зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.4 KiB
C++
73 строки
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PrintTargetPDF.h"
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#include "cairo.h"
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#include "cairo-pdf.h"
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namespace mozilla {
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namespace gfx {
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static cairo_status_t write_func(void* closure, const unsigned char* data,
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unsigned int length) {
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nsCOMPtr<nsIOutputStream> out = reinterpret_cast<nsIOutputStream*>(closure);
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do {
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uint32_t wrote = 0;
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if (NS_FAILED(out->Write((const char*)data, length, &wrote))) {
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break;
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}
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data += wrote;
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length -= wrote;
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} while (length > 0);
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NS_ASSERTION(length == 0, "not everything was written to the file");
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return CAIRO_STATUS_SUCCESS;
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}
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PrintTargetPDF::PrintTargetPDF(cairo_surface_t* aCairoSurface,
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const IntSize& aSize, nsIOutputStream* aStream)
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: PrintTarget(aCairoSurface, aSize), mStream(aStream) {}
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PrintTargetPDF::~PrintTargetPDF() {
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// We get called first, then PrintTarget's dtor. That means that mStream
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// is destroyed before PrintTarget's dtor calls cairo_surface_destroy. This
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// can be a problem if Finish() hasn't been called on us, since
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// cairo_surface_destroy will then call cairo_surface_finish and that will
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// end up invoking write_func above with the by now dangling pointer mStream
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// that mCairoSurface stored. To prevent that from happening we must call
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// Flush here before mStream is deleted.
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Finish();
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}
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/* static */ already_AddRefed<PrintTargetPDF> PrintTargetPDF::CreateOrNull(
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nsIOutputStream* aStream, const IntSize& aSizeInPoints) {
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cairo_surface_t* surface = cairo_pdf_surface_create_for_stream(
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write_func, (void*)aStream, aSizeInPoints.width, aSizeInPoints.height);
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if (cairo_surface_status(surface)) {
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return nullptr;
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}
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// The new object takes ownership of our surface reference.
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RefPtr<PrintTargetPDF> target =
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new PrintTargetPDF(surface, aSizeInPoints, aStream);
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return target.forget();
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}
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nsresult PrintTargetPDF::EndPage() {
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cairo_surface_show_page(mCairoSurface);
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return PrintTarget::EndPage();
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}
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void PrintTargetPDF::Finish() {
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if (mIsFinished) {
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return; // We don't want to call Close() on mStream more than once
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}
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PrintTarget::Finish();
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mStream->Close();
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}
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} // namespace gfx
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} // namespace mozilla
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