зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
3.6 KiB
C++
113 строки
3.6 KiB
C++
/* -*- 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 "PrintTargetPS.h"
|
|
|
|
#include "cairo.h"
|
|
#include "cairo-ps.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;
|
|
}
|
|
|
|
PrintTargetPS::PrintTargetPS(cairo_surface_t* aCairoSurface,
|
|
const IntSize& aSize,
|
|
nsIOutputStream *aStream,
|
|
PageOrientation aOrientation)
|
|
: PrintTarget(aCairoSurface, aSize)
|
|
, mStream(aStream)
|
|
, mOrientation(aOrientation)
|
|
{
|
|
}
|
|
|
|
PrintTargetPS::~PrintTargetPS()
|
|
{
|
|
// 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<PrintTargetPS>
|
|
PrintTargetPS::CreateOrNull(nsIOutputStream *aStream,
|
|
IntSize aSizeInPoints,
|
|
PageOrientation aOrientation)
|
|
{
|
|
// The PS output does not specify the page size so to print landscape we need
|
|
// to rotate the drawing 90 degrees and print on portrait paper. If printing
|
|
// landscape, swap the width/height supplied to cairo to select a portrait
|
|
// print area. Our consumers are responsible for checking
|
|
// RotateForLandscape() and applying a rotation transform if true.
|
|
if (aOrientation == LANDSCAPE) {
|
|
Swap(aSizeInPoints.width, aSizeInPoints.height);
|
|
}
|
|
|
|
cairo_surface_t* surface =
|
|
cairo_ps_surface_create_for_stream(write_func, (void*)aStream,
|
|
aSizeInPoints.width,
|
|
aSizeInPoints.height);
|
|
if (cairo_surface_status(surface)) {
|
|
return nullptr;
|
|
}
|
|
cairo_ps_surface_restrict_to_level(surface, CAIRO_PS_LEVEL_2);
|
|
|
|
// The new object takes ownership of our surface reference.
|
|
RefPtr<PrintTargetPS> target = new PrintTargetPS(surface, aSizeInPoints,
|
|
aStream, aOrientation);
|
|
return target.forget();
|
|
}
|
|
|
|
nsresult
|
|
PrintTargetPS::BeginPrinting(const nsAString& aTitle,
|
|
const nsAString& aPrintToFileName,
|
|
int32_t aStartPage,
|
|
int32_t aEndPage)
|
|
{
|
|
if (mOrientation == PORTRAIT) {
|
|
cairo_ps_surface_dsc_comment(mCairoSurface, "%%Orientation: Portrait");
|
|
} else {
|
|
cairo_ps_surface_dsc_comment(mCairoSurface, "%%Orientation: Landscape");
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
PrintTargetPS::EndPage()
|
|
{
|
|
cairo_surface_show_page(mCairoSurface);
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
PrintTargetPS::Finish()
|
|
{
|
|
if (mIsFinished) {
|
|
return; // We don't want to call Close() on mStream more than once
|
|
}
|
|
PrintTarget::Finish();
|
|
mStream->Close();
|
|
}
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|