Quelle PrintTarget.cpp Sprache: C

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "PrintTarget.h"

#include "cairo.h"
#ifdef CAIRO_HAS_QUARTZ_SURFACE
#  include "cairo-quartz.h"
#endif
#ifdef CAIRO_HAS_WIN32_SURFACE
#  include "cairo-win32.h"
#endif
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/HelpersCairo.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsUTF8Utils.h"

// IPP spec disallow the job-name which is over 255 characters.
// RFC: https://tools.ietf.org/html/rfc2911#section-4.1.2
#define IPP_JOB_NAME_LIMIT_LENGTH 255

namespace mozilla::gfx {

PrintTarget::PrintTarget(cairo_surface_t* aCairoSurface, const IntSize& aSize)
    : mCairoSurface(aCairoSurface),
      mSize(aSize),
      mIsFinished(false)
#ifdef DEBUG
      ,
      mHasActivePage(false)
#endif

{
#if 0
  // aCairoSurface is null when our PrintTargetThebes subclass's ctor calls us.
  // Once PrintTargetThebes is removed, enable this assertion.
  MOZ_ASSERT(aCairoSurface && !cairo_surface_status(aCairoSurface),
             "CreateOrNull factory methods should not call us without a "
             "valid cairo_surface_t*");
#endif

  // CreateOrNull factory methods hand over ownership of aCairoSurface,
  // so we don't call cairo_surface_reference(aSurface) here.

  // This code was copied from gfxASurface::Init:
  if (mCairoSurface &&
      cairo_surface_get_content(mCairoSurface) != CAIRO_CONTENT_COLOR) {
    cairo_surface_set_subpixel_antialiasing(
        mCairoSurface, CAIRO_SUBPIXEL_ANTIALIASING_DISABLED);
  }
}

PrintTarget::~PrintTarget() {
  // null surfaces are allowed here
  cairo_surface_destroy(mCairoSurface);
  mCairoSurface = nullptr;
}

already_AddRefed<DrawTarget> PrintTarget::MakeDrawTarget(
    const IntSize& aSize, DrawEventRecorder* aRecorder) {
  MOZ_ASSERT(mCairoSurface,
             "We shouldn't have been constructed without a cairo surface");

  // This should not be called outside of BeginPage()/EndPage() calls since
  // some backends can only provide a valid DrawTarget at that time.
  MOZ_ASSERT(mHasActivePage, "We can't guarantee a valid DrawTarget");

  if (cairo_surface_status(mCairoSurface)) {
    return nullptr;
  }

  // Note than aSize may not be the same as mSize (the size of mCairoSurface).
  // See the comments in our header.  If the sizes are different a clip will
  // be applied to mCairoSurface.
  RefPtr<DrawTarget> dt =
      Factory::CreateDrawTargetForCairoSurface(mCairoSurface, aSize);
  if (!dt || !dt->IsValid()) {
    return nullptr;
  }

  if (aRecorder) {
    dt = CreateRecordingDrawTarget(aRecorder, dt);
    if (!dt || !dt->IsValid()) {
      return nullptr;
    }
  }

  return dt.forget();
}

already_AddRefed<DrawTarget> PrintTarget::GetReferenceDrawTarget() {
  if (!mRefDT) {
    const IntSize size(1, 1);

    cairo_surface_t* similar;
    switch (cairo_surface_get_type(mCairoSurface)) {
#ifdef CAIRO_HAS_WIN32_SURFACE
      case CAIRO_SURFACE_TYPE_WIN32:
        similar = cairo_win32_surface_create_with_dib(
            CairoContentToCairoFormat(cairo_surface_get_content(mCairoSurface)),
            size.width, size.height);
        break;
#endif
#ifdef CAIRO_HAS_QUARTZ_SURFACE
      case CAIRO_SURFACE_TYPE_QUARTZ:
        if (StaticPrefs::gfx_cairo_quartz_cg_layer_enabled()) {
          similar = cairo_quartz_surface_create_cg_layer(
              mCairoSurface, cairo_surface_get_content(mCairoSurface),
              size.width, size.height);
          break;
        }
        [[fallthrough]];
#endif
      default:
        similar = cairo_surface_create_similar(
            mCairoSurface, cairo_surface_get_content(mCairoSurface), size.width,
            size.height);
        break;
    }

    if (cairo_surface_status(similar)) {
      return nullptr;
    }

    RefPtr<DrawTarget> dt =
        Factory::CreateDrawTargetForCairoSurface(similar, size);

    // The DT addrefs the surface, so we need drop our own reference to it:
    cairo_surface_destroy(similar);

    if (!dt || !dt->IsValid()) {
      return nullptr;
    }
    mRefDT = std::move(dt);
  }

  return do_AddRef(mRefDT);
}

/* static */
void PrintTarget::AdjustPrintJobNameForIPP(const nsAString& aJobName,
                                           nsCString& aAdjustedJobName) {
  CopyUTF16toUTF8(aJobName, aAdjustedJobName);

  if (aAdjustedJobName.Length() > IPP_JOB_NAME_LIMIT_LENGTH) {
    uint32_t length = RewindToPriorUTF8Codepoint(
        aAdjustedJobName.get(), (IPP_JOB_NAME_LIMIT_LENGTH - 3U));
    aAdjustedJobName.SetLength(length);
    aAdjustedJobName.AppendLiteral("...");
  }
}

/* static */
void PrintTarget::AdjustPrintJobNameForIPP(const nsAString& aJobName,
                                           nsString& aAdjustedJobName) {
  nsAutoCString jobName;
  AdjustPrintJobNameForIPP(aJobName, jobName);

  CopyUTF8toUTF16(jobName, aAdjustedJobName);
}

/* static */
already_AddRefed<DrawTarget> PrintTarget::CreateRecordingDrawTarget(
    DrawEventRecorder* aRecorder, DrawTarget* aDrawTarget) {
  MOZ_ASSERT(aRecorder);
  MOZ_ASSERT(aDrawTarget);

  RefPtr<DrawTarget> dt;

  if (aRecorder) {
    // It doesn't really matter what we pass as the DrawTarget here.
    dt = gfx::Factory::CreateRecordingDrawTarget(aRecorder, aDrawTarget,
                                                 aDrawTarget->GetRect());
  }

  if (!dt || !dt->IsValid()) {
    gfxCriticalNote
        << "Failed to create a recording DrawTarget for PrintTarget";
    return nullptr;
  }

  return dt.forget();
}

void PrintTarget::Finish() {
  if (mIsFinished) {
    return;
  }
  mIsFinished = true;

  // null surfaces are allowed here
  cairo_surface_finish(mCairoSurface);
}

}  // namespace mozilla::gfx

quality100%

¤ Dauer der Verarbeitung: 0.16 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.