// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module printing.mojom;

import "mojo/public/mojom/base/shared_memory.mojom";
import "ui/gfx/geometry/mojo/geometry.mojom";
import "url/mojom/url.mojom";

// This set of interfaces is used to do Nup PDF conversion.
// Usage:
// - generate a PdfNupConverter.
//
// - call PdfNupConverter.NupPageConvert() to import N PDF pages into one N-up
//   PDF page.
//
// - call PdfNupConverter.NupDocumentConvert() to convert a PDF document to a
//   N-up PDF document.
//
// - call PdfNupConverter.SetWebContentsURL() to set the URL that is committed
//   in the main frame of the WebContents for crash diagnosis.
interface PdfNupConverter {

  // The status of PDF conversion execution.
  enum Status {
    SUCCESS = 0,
    CONVERSION_FAILURE = 1,
    HANDLE_MAP_ERROR = 2,
  };

  // Convert a list of PDF pages to a N-up PDF.
  // |pages_per_sheet| is the number of pages to put on a single sheet.
  // |page_size| is the output page size, measured in PDF "user space" units.
  // |pdf_page_regions| is a list of pdf pages to be converted to a N-up page.
  // The number of items in |pdf_page_regions| can be different from N.  It
  // will return a N-up PDF document of
  // Math.ceil(size of |pdf_page_regions| / N) pages in it.
  NupPageConvert(
      uint32 pages_per_sheet,
      gfx.mojom.Size page_size,
      array<mojo_base.mojom.ReadOnlySharedMemoryRegion> pdf_page_regions)
   => (Status status, mojo_base.mojom.ReadOnlySharedMemoryRegion? pdf_region);

  // Convert a PDF document to a N-up PDF document.
  // |pages_per_sheet| is the number of pages to put on a single sheet.
  // |page_size| is the output page size, measured in PDF "user space" units.
  NupDocumentConvert(uint32 pages_per_sheet,
                     gfx.mojom.Size page_size,
                     mojo_base.mojom.ReadOnlySharedMemoryRegion src_pdf_region)
   => (Status status, mojo_base.mojom.ReadOnlySharedMemoryRegion? pdf_region);

  // Sets the URL which is committed in the main frame of the WebContents,
  // for use in crash diagnosis.
  SetWebContentsURL(url.mojom.Url url);
};