86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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
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write_func(void *closure, const unsigned char *data, unsigned int length)
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{
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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; 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,
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nsIOutputStream *aStream)
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: PrintTarget(aCairoSurface, aSize)
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, mStream(aStream)
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{
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}
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PrintTargetPDF::~PrintTargetPDF()
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{
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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>
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PrintTargetPDF::CreateOrNull(nsIOutputStream *aStream,
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const IntSize& aSizeInPoints)
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{
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cairo_surface_t* surface =
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cairo_pdf_surface_create_for_stream(write_func, (void*)aStream,
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aSizeInPoints.width,
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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 = new PrintTargetPDF(surface, aSizeInPoints,
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aStream);
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return target.forget();
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}
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nsresult
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PrintTargetPDF::EndPage()
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{
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cairo_surface_show_page(mCairoSurface);
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return NS_OK;
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}
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void
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PrintTargetPDF::Finish()
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{
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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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