cpdf_npagetooneexporter.cpp | Explore in Territory

// Copyright 2024 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fpdfapi/edit/cpdf_npagetooneexporter.h"

#include <algorithm>
#include <memory>
#include <sstream>
#include <utility>

#include "constants/page_object.h"
#include "core/fpdfapi/edit/cpdf_contentstream_write_utils.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_string_wrappers.h"
#include "core/fxcrt/span.h"

namespace {

// Calculates the N-up parameters.  When importing multiple pages into one page.
// The space of output page is evenly divided along the X axis and Y axis based
// on the input `pages_on_x_axis` and `pages_on_y_axis`.
class NupState { … };

NupState::NupState(const CFX_SizeF& pagesize,
                   size_t pages_on_x_axis,
                   size_t pages_on_y_axis)
    : … { … }

std::pair<size_t, size_t> NupState::ConvertPageOrder() const { … }

CPDF_NPageToOneExporter::NupPageSettings NupState::CalculatePageEdit(
    size_t sub_x,
    size_t sub_y,
    const CFX_SizeF& pagesize) const { … }

CPDF_NPageToOneExporter::NupPageSettings NupState::CalculateNewPagePosition(
    const CFX_SizeF& pagesize) { … }

// Helper that generates the content stream for a sub-page.
ByteString GenerateSubPageContentStream(
    const ByteString& xobject_name,
    const CPDF_NPageToOneExporter::NupPageSettings& settings) { … }

}  // namespace

CPDF_NPageToOneExporter::CPDF_NPageToOneExporter(CPDF_Document* dest_doc,
                                                 CPDF_Document* src_doc)
    : … { … }

CPDF_NPageToOneExporter::~CPDF_NPageToOneExporter() = default;

bool CPDF_NPageToOneExporter::ExportNPagesToOne(
    pdfium::span<const uint32_t> page_indices,
    const CFX_SizeF& dest_page_size,
    size_t pages_on_x_axis,
    size_t pages_on_y_axis) { … }

// static
ByteString CPDF_NPageToOneExporter::GenerateSubPageContentStreamForTesting(
    const ByteString& xobject_name,
    const NupPageSettings& settings) { … }

ByteString CPDF_NPageToOneExporter::AddSubPage(
    const RetainPtr<CPDF_Page>& src_page,
    const NupPageSettings& settings) { … }

RetainPtr<CPDF_Stream> CPDF_NPageToOneExporter::MakeXObjectFromPageRaw(
    RetainPtr<CPDF_Page> src_page) { … }

ByteString CPDF_NPageToOneExporter::MakeXObjectFromPage(
    RetainPtr<CPDF_Page> src_page) { … }

std::unique_ptr<XObjectContext>
CPDF_NPageToOneExporter::CreateXObjectContextFromPage(int src_page_index) { … }

void CPDF_NPageToOneExporter::FinishPage(
    RetainPtr<CPDF_Dictionary> dest_page_dict,
    const ByteString& content) { … }

XObjectContext::XObjectContext() = default;

XObjectContext::~XObjectContext() = default;
chromium/third_party/pdfium/core/fpdfapi/edit/cpdf_npagetooneexporter.cpp
