fpdfsdk/fpdf_edit_embeddertest.cpp

// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "build/build_config.h"
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fxcrt/fx_codepage.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/fx_font.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "public/cpp/fpdf_scopers.h"
#include "public/fpdf_annot.h"
#include "public/fpdf_edit.h"
#include "public/fpdfview.h"
#include "testing/embedder_test.h"
#include "testing/embedder_test_constants.h"
#include "testing/fx_string_testhelpers.h"
#include "testing/gmock/include/gmock/gmock-matchers.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/utils/file_util.h"
#include "testing/utils/hash.h"
#include "testing/utils/path_service.h"
#include "third_party/base/check.h"

using pdfium::HelloWorldChecksum;
using testing::HasSubstr;
using testing::Not;
using testing::UnorderedElementsAreArray;

namespace {

const char kAllRemovedChecksum[] = "eee4600ac08b458ac7ac2320e225674c";

const wchar_t kBottomText[] = L"I'm at the bottom of the page";

const char* BottomTextChecksum() {
#if BUILDFLAG(IS_APPLE)
  if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
    return "81636489006a31fcb00cf29efcdf7909";
#endif
  return "891dcb6e914c8360998055f1f47c9727";
}

const char* FirstRemovedChecksum() {
#if BUILDFLAG(IS_APPLE)
  if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
    return "a1dc2812692fcc7ee4f01ca77435df9d";
#endif
  return "e1477dc3b5b3b9c560814c4d1135a02b";
}

const wchar_t kLoadedFontText[] = L"I am testing my loaded font, WEE.";

const char* LoadedFontTextChecksum() {
  if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
    return "d58570cc045dfb818b92cbabbd1a364c";
#if BUILDFLAG(IS_APPLE)
  return "0f3e4a7d71f9e7eb8a1a0d69403b9848";
#else
  return "d58570cc045dfb818b92cbabbd1a364c";
#endif
}

const char kRedRectangleChecksum[] = "66d02eaa6181e2c069ce2ea99beda497";

// In embedded_images.pdf.
const char kEmbeddedImage33Checksum[] = "cb3637934bb3b95a6e4ae1ea9eb9e56e";

}  // namespace

class FPDFEditEmbedderTest : public EmbedderTest {
 protected:
  FPDF_DOCUMENT CreateNewDocument() {
    CreateEmptyDocumentWithoutFormFillEnvironment();
    cpdf_doc_ = CPDFDocumentFromFPDFDocument(document());
    return document();
  }

  void CheckFontDescriptor(const CPDF_Dictionary* font_dict,
                           int font_type,
                           bool bold,
                           bool italic,
                           pdfium::span<const uint8_t> span) {
    RetainPtr<const CPDF_Dictionary> font_desc =
        font_dict->GetDictFor("FontDescriptor");
    ASSERT_TRUE(font_desc);
    EXPECT_EQ("FontDescriptor", font_desc->GetNameFor("Type"));
    ByteString font_name = font_desc->GetNameFor("FontName");
    EXPECT_FALSE(font_name.IsEmpty());
    EXPECT_EQ(font_dict->GetNameFor("BaseFont"), font_name);

    // Check that the font descriptor has the required keys according to spec
    // 1.7 Table 5.19
    ASSERT_TRUE(font_desc->KeyExist("Flags"));

    int font_flags = font_desc->GetIntegerFor("Flags");
    EXPECT_EQ(bold, FontStyleIsForceBold(font_flags));
    EXPECT_EQ(italic, FontStyleIsItalic(font_flags));
    EXPECT_TRUE(FontStyleIsNonSymbolic(font_flags));
    ASSERT_TRUE(font_desc->KeyExist("FontBBox"));

    RetainPtr<const CPDF_Array> fontBBox = font_desc->GetArrayFor("FontBBox");
    ASSERT_TRUE(fontBBox);
    EXPECT_EQ(4u, fontBBox->size());
    // Check that the coordinates are in the preferred order according to spec
    // 1.7 Section 3.8.4
    EXPECT_TRUE(fontBBox->GetIntegerAt(0) < fontBBox->GetIntegerAt(2));
    EXPECT_TRUE(fontBBox->GetIntegerAt(1) < fontBBox->GetIntegerAt(3));

    EXPECT_TRUE(font_desc->KeyExist("ItalicAngle"));
    EXPECT_TRUE(font_desc->KeyExist("Ascent"));
    EXPECT_TRUE(font_desc->KeyExist("Descent"));
    EXPECT_TRUE(font_desc->KeyExist("CapHeight"));
    EXPECT_TRUE(font_desc->KeyExist("StemV"));
    ByteString present("FontFile");
    ByteString absent("FontFile2");
    if (font_type == FPDF_FONT_TRUETYPE)
      std::swap(present, absent);
    EXPECT_TRUE(font_desc->KeyExist(present));
    EXPECT_FALSE(font_desc->KeyExist(absent));

    auto streamAcc =
        pdfium::MakeRetain<CPDF_StreamAcc>(font_desc->GetStreamFor(present));
    streamAcc->LoadAllDataRaw();

    // Check that the font stream is the one that was provided
    ASSERT_EQ(span.size(), streamAcc->GetSize());
    if (font_type == FPDF_FONT_TRUETYPE) {
      ASSERT_EQ(static_cast<int>(span.size()), streamAcc->GetLength1ForTest());
    }

    pdfium::span<const uint8_t> stream_data = streamAcc->GetSpan();
    for (size_t j = 0; j < span.size(); j++)
      EXPECT_EQ(span[j], stream_data[j]) << " at byte " << j;
  }

  void CheckCompositeFontWidths(const CPDF_Array* widths_array,
                                CPDF_Font* typed_font) {
    // Check that W array is in a format that conforms to PDF spec 1.7 section
    // "Glyph Metrics in CIDFonts" (these checks are not
    // implementation-specific).
    EXPECT_GT(widths_array->size(), 1u);
    int num_cids_checked = 0;
    int cur_cid = 0;
    for (size_t idx = 0; idx < widths_array->size(); idx++) {
      int cid = widths_array->GetFloatAt(idx);
      EXPECT_GE(cid, cur_cid);
      ASSERT_FALSE(++idx == widths_array->size());
      RetainPtr<const CPDF_Object> next = widths_array->GetObjectAt(idx);
      if (next->IsArray()) {
        // We are in the c [w1 w2 ...] case
        const CPDF_Array* arr = next->AsArray();
        int cnt = static_cast<int>(arr->size());
        size_t inner_idx = 0;
        for (cur_cid = cid; cur_cid < cid + cnt; cur_cid++) {
          int width = arr->GetFloatAt(inner_idx++);
          EXPECT_EQ(width, typed_font->GetCharWidthF(cur_cid))
              << " at cid " << cur_cid;
        }
        num_cids_checked += cnt;
        continue;
      }
      // Otherwise, are in the c_first c_last w case.
      ASSERT_TRUE(next->IsNumber());
      int last_cid = next->AsNumber()->GetInteger();
      ASSERT_FALSE(++idx == widths_array->size());
      int width = widths_array->GetFloatAt(idx);
      for (cur_cid = cid; cur_cid <= last_cid; cur_cid++) {
        EXPECT_EQ(width, typed_font->GetCharWidthF(cur_cid))
            << " at cid " << cur_cid;
      }
      num_cids_checked += last_cid - cid + 1;
    }
    // Make sure we have a good amount of cids described
    EXPECT_GT(num_cids_checked, 200);
  }
  CPDF_Document* cpdf_doc() { return cpdf_doc_; }

 private:
  CPDF_Document* cpdf_doc_;
};

namespace {

const char kExpectedPDF[] =
    "%PDF-1.7\r\n"
    "%\xA1\xB3\xC5\xD7\r\n"
    "1 0 obj\r\n"
    "<</Pages 2 0 R /Type/Catalog>>\r\n"
    "endobj\r\n"
    "2 0 obj\r\n"
    "<</Count 1/Kids\\[ 4 0 R \\]/Type/Pages>>\r\n"
    "endobj\r\n"
    "3 0 obj\r\n"
    "<</CreationDate\\(D:.*\\)/Creator\\(PDFium\\)>>\r\n"
    "endobj\r\n"
    "4 0 obj\r\n"
    "<</MediaBox\\[ 0 0 640 480\\]/Parent 2 0 R "
    "/Resources<<>>"
    "/Rotate 0/Type/Page"
    ">>\r\n"
    "endobj\r\n"
    "xref\r\n"
    "0 5\r\n"
    "0000000000 65535 f\r\n"
    "0000000017 00000 n\r\n"
    "0000000066 00000 n\r\n"
    "0000000122 00000 n\r\n"
    "0000000192 00000 n\r\n"
    "trailer\r\n"
    "<<\r\n"
    "/Root 1 0 R\r\n"
    "/Info 3 0 R\r\n"
    "/Size 5/ID\\[<.*><.*>\\]>>\r\n"
    "startxref\r\n"
    "285\r\n"
    "%%EOF\r\n";

}  // namespace

TEST_F(FPDFEditEmbedderTest, EmbedNotoSansSCFont) {
  CreateEmptyDocument();
  ScopedFPDFPage page(FPDFPage_New(document(), 0, 400, 400));
  std::string font_path;
  ASSERT_TRUE(PathService::GetThirdPartyFilePath(
      "NotoSansCJK/NotoSansSC-Regular.subset.otf", &font_path));

  size_t file_length = 0;
  std::unique_ptr<char, pdfium::FreeDeleter> font_data =
      GetFileContents(font_path.c_str(), &file_length);
  ASSERT_TRUE(font_data);

  ScopedFPDFFont font(FPDFText_LoadFont(
      document(), reinterpret_cast<const uint8_t*>(font_data.get()),
      file_length, FPDF_FONT_TRUETYPE, /*cid=*/true));
  FPDF_PAGEOBJECT text_object =
      FPDFPageObj_CreateTextObj(document(), font.get(), 20.0f);
  EXPECT_TRUE(text_object);

  // Test the characters which are either mapped to one single unicode or
  // multiple unicodes in the embedded font.
  ScopedFPDFWideString text = GetFPDFWideString(L"这是第一句。 这是第二行。");
  EXPECT_TRUE(FPDFText_SetText(text_object, text.get()));

  FPDFPageObj_Transform(text_object, 1, 0, 0, 1, 50, 200);
  FPDFPage_InsertObject(page.get(), text_object);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));

  const char kChecksum[] = "9a31fb87d1c6d2346bba22d1196041cd";
  ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
  CompareBitmap(page_bitmap.get(), 400, 400, kChecksum);

  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  VerifySavedDocument(400, 400, kChecksum);
}

TEST_F(FPDFEditEmbedderTest, EmbedNotoSansSCFontWithCharcodes) {
  CreateEmptyDocument();
  ScopedFPDFPage page(FPDFPage_New(document(), 0, 400, 400));
  std::string font_path;
  ASSERT_TRUE(PathService::GetThirdPartyFilePath(
      "NotoSansCJK/NotoSansSC-Regular.subset.otf", &font_path));

  size_t file_length = 0;
  std::unique_ptr<char, pdfium::FreeDeleter> font_data =
      GetFileContents(font_path.c_str(), &file_length);
  ASSERT_TRUE(font_data);

  ScopedFPDFFont font(FPDFText_LoadFont(
      document(), reinterpret_cast<const uint8_t*>(font_data.get()),
      file_length, FPDF_FONT_TRUETYPE, /*cid=*/true));
  FPDF_PAGEOBJECT text_object =
      FPDFPageObj_CreateTextObj(document(), font.get(), 20.0f);
  EXPECT_TRUE(text_object);

  // Same as `text` in the EmbedNotoSansSCFont test case above.
  const std::vector<uint32_t> charcodes = {9, 6, 7, 3, 5, 2, 1,
                                           9, 6, 7, 4, 8, 2};
  EXPECT_TRUE(
      FPDFText_SetCharcodes(text_object, charcodes.data(), charcodes.size()));

  FPDFPageObj_Transform(text_object, 1, 0, 0, 1, 50, 200);
  FPDFPage_InsertObject(page.get(), text_object);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));

  const char kChecksum[] = "9a31fb87d1c6d2346bba22d1196041cd";
  ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
  CompareBitmap(page_bitmap.get(), 400, 400, kChecksum);

  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  VerifySavedDocument(400, 400, kChecksum);
}

TEST_F(FPDFEditEmbedderTest, EmptyCreation) {
  CreateEmptyDocument();
  FPDF_PAGE page = FPDFPage_New(document(), 0, 640.0, 480.0);
  EXPECT_TRUE(page);
  // The FPDFPage_GenerateContent call should do nothing.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));

  EXPECT_THAT(GetString(), testing::MatchesRegex(std::string(
                               kExpectedPDF, sizeof(kExpectedPDF))));
  FPDF_ClosePage(page);
}

// Regression test for https://crbug.com/667012
TEST_F(FPDFEditEmbedderTest, RasterizePDF) {
  const char kAllBlackChecksum[] = "5708fc5c4a8bd0abde99c8e8f0390615";

  // Get the bitmap for the original document.
  ScopedFPDFBitmap orig_bitmap;
  {
    ASSERT_TRUE(OpenDocument("black.pdf"));
    FPDF_PAGE orig_page = LoadPage(0);
    ASSERT_TRUE(orig_page);
    orig_bitmap = RenderLoadedPage(orig_page);
    CompareBitmap(orig_bitmap.get(), 612, 792, kAllBlackChecksum);
    UnloadPage(orig_page);
  }

  // Create a new document from |orig_bitmap| and save it.
  {
    FPDF_DOCUMENT temp_doc = FPDF_CreateNewDocument();
    FPDF_PAGE temp_page = FPDFPage_New(temp_doc, 0, 612, 792);

    // Add the bitmap to an image object and add the image object to the output
    // page.
    FPDF_PAGEOBJECT temp_img = FPDFPageObj_NewImageObj(temp_doc);
    EXPECT_TRUE(
        FPDFImageObj_SetBitmap(&temp_page, 1, temp_img, orig_bitmap.get()));
    static constexpr FS_MATRIX kLetterScaleMatrix{612, 0, 0, 792, 0, 0};
    EXPECT_TRUE(FPDFPageObj_SetMatrix(temp_img, &kLetterScaleMatrix));
    FPDFPage_InsertObject(temp_page, temp_img);
    EXPECT_TRUE(FPDFPage_GenerateContent(temp_page));
    EXPECT_TRUE(FPDF_SaveAsCopy(temp_doc, this, 0));
    FPDF_ClosePage(temp_page);
    FPDF_CloseDocument(temp_doc);
  }

  // Get the generated content. Make sure it is at least as big as the original
  // PDF.
  EXPECT_GT(GetString().size(), 923u);
  VerifySavedDocument(612, 792, kAllBlackChecksum);
}

TEST_F(FPDFEditEmbedderTest, AddPaths) {
  // Start with a blank page
  FPDF_PAGE page = FPDFPage_New(CreateNewDocument(), 0, 612, 792);
  ASSERT_TRUE(page);

  // We will first add a red rectangle
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(10, 10, 20, 20);
  ASSERT_TRUE(red_rect);
  // Expect false when trying to set colors out of range
  EXPECT_FALSE(FPDFPageObj_SetStrokeColor(red_rect, 100, 100, 100, 300));
  EXPECT_FALSE(FPDFPageObj_SetFillColor(red_rect, 200, 256, 200, 0));

  // Fill rectangle with red and insert to the page
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));

  int fillmode = FPDF_FILLMODE_NONE;
  FPDF_BOOL stroke = true;
  EXPECT_TRUE(FPDFPath_GetDrawMode(red_rect, &fillmode, &stroke));
  EXPECT_EQ(FPDF_FILLMODE_ALTERNATE, fillmode);
  EXPECT_FALSE(stroke);

  static constexpr FS_MATRIX kMatrix = {1, 2, 3, 4, 5, 6};
  EXPECT_TRUE(FPDFPageObj_SetMatrix(red_rect, &kMatrix));

  FS_MATRIX matrix;
  EXPECT_TRUE(FPDFPageObj_GetMatrix(red_rect, &matrix));
  EXPECT_FLOAT_EQ(1.0f, matrix.a);
  EXPECT_FLOAT_EQ(2.0f, matrix.b);
  EXPECT_FLOAT_EQ(3.0f, matrix.c);
  EXPECT_FLOAT_EQ(4.0f, matrix.d);
  EXPECT_FLOAT_EQ(5.0f, matrix.e);
  EXPECT_FLOAT_EQ(6.0f, matrix.f);

  // Set back the identity matrix.
  matrix = {1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f};
  EXPECT_TRUE(FPDFPageObj_SetMatrix(red_rect, &matrix));

  FPDFPage_InsertObject(page, red_rect);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792, kRedRectangleChecksum);
  }

  // Now add to that a green rectangle with some medium alpha
  FPDF_PAGEOBJECT green_rect = FPDFPageObj_CreateNewRect(100, 100, 40, 40);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(green_rect, 0, 255, 0, 128));

  // Make sure the type of the rectangle is a path.
  EXPECT_EQ(FPDF_PAGEOBJ_PATH, FPDFPageObj_GetType(green_rect));

  // Make sure we get back the same color we set previously.
  unsigned int R;
  unsigned int G;
  unsigned int B;
  unsigned int A;
  EXPECT_TRUE(FPDFPageObj_GetFillColor(green_rect, &R, &G, &B, &A));
  EXPECT_EQ(0u, R);
  EXPECT_EQ(255u, G);
  EXPECT_EQ(0u, B);
  EXPECT_EQ(128u, A);

  // Make sure the path has 5 points (1 CFX_Path::Point::Type::kMove and 4
  // CFX_Path::Point::Type::kLine).
  ASSERT_EQ(5, FPDFPath_CountSegments(green_rect));
  // Verify actual coordinates.
  FPDF_PATHSEGMENT segment = FPDFPath_GetPathSegment(green_rect, 0);
  float x;
  float y;
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(100, x);
  EXPECT_EQ(100, y);
  EXPECT_EQ(FPDF_SEGMENT_MOVETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(green_rect, 1);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(100, x);
  EXPECT_EQ(140, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(green_rect, 2);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(140, x);
  EXPECT_EQ(140, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(green_rect, 3);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(140, x);
  EXPECT_EQ(100, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(green_rect, 4);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(100, x);
  EXPECT_EQ(100, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_TRUE(FPDFPathSegment_GetClose(segment));

  EXPECT_TRUE(FPDFPath_SetDrawMode(green_rect, FPDF_FILLMODE_WINDING, 0));
  FPDFPage_InsertObject(page, green_rect);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792,
                  "7b0b87604594e773add528fae567a558");
  }

  // Add a black triangle.
  FPDF_PAGEOBJECT black_path = FPDFPageObj_CreateNewPath(400, 100);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(black_path, 0, 0, 0, 200));
  EXPECT_TRUE(FPDFPath_SetDrawMode(black_path, FPDF_FILLMODE_ALTERNATE, 0));
  EXPECT_TRUE(FPDFPath_LineTo(black_path, 400, 200));
  EXPECT_TRUE(FPDFPath_LineTo(black_path, 300, 100));
  EXPECT_TRUE(FPDFPath_Close(black_path));

  // Make sure the path has 3 points (1 CFX_Path::Point::Type::kMove and 2
  // CFX_Path::Point::Type::kLine).
  ASSERT_EQ(3, FPDFPath_CountSegments(black_path));
  // Verify actual coordinates.
  segment = FPDFPath_GetPathSegment(black_path, 0);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(400, x);
  EXPECT_EQ(100, y);
  EXPECT_EQ(FPDF_SEGMENT_MOVETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(black_path, 1);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(400, x);
  EXPECT_EQ(200, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));
  segment = FPDFPath_GetPathSegment(black_path, 2);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(300, x);
  EXPECT_EQ(100, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_TRUE(FPDFPathSegment_GetClose(segment));
  // Make sure out of bounds index access fails properly.
  EXPECT_FALSE(FPDFPath_GetPathSegment(black_path, 3));

  FPDFPage_InsertObject(page, black_path);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792,
                  "eadc8020a14dfcf091da2688733d8806");
  }

  // Now add a more complex blue path.
  FPDF_PAGEOBJECT blue_path = FPDFPageObj_CreateNewPath(200, 200);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(blue_path, 0, 0, 255, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(blue_path, FPDF_FILLMODE_WINDING, 0));
  EXPECT_TRUE(FPDFPath_LineTo(blue_path, 230, 230));
  EXPECT_TRUE(FPDFPath_BezierTo(blue_path, 250, 250, 280, 280, 300, 300));
  EXPECT_TRUE(FPDFPath_LineTo(blue_path, 325, 325));
  EXPECT_TRUE(FPDFPath_LineTo(blue_path, 350, 325));
  EXPECT_TRUE(FPDFPath_BezierTo(blue_path, 375, 330, 390, 360, 400, 400));
  EXPECT_TRUE(FPDFPath_Close(blue_path));
  FPDFPage_InsertObject(page, blue_path);
  const char* last_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "ed14c60702b1489c597c7d46ece7f86d";
    return "9823e1a21bd9b72b6a442ba4f12af946";
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792, last_checksum);
  }

  // Now save the result, closing the page and document
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  FPDF_ClosePage(page);

  // Render the saved result
  VerifySavedDocument(612, 792, last_checksum);
}

TEST_F(FPDFEditEmbedderTest, ClipPath) {
  // Load document with a clipped rectangle.
  ASSERT_TRUE(OpenDocument("clip_path.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  ASSERT_EQ(1, FPDFPage_CountObjects(page));

  FPDF_PAGEOBJECT triangle = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(triangle);

  // Test that we got the expected triangle.
  ASSERT_EQ(4, FPDFPath_CountSegments(triangle));

  FPDF_PATHSEGMENT segment = FPDFPath_GetPathSegment(triangle, 0);
  float x;
  float y;
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(10, x);
  EXPECT_EQ(10, y);
  EXPECT_EQ(FPDF_SEGMENT_MOVETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFPath_GetPathSegment(triangle, 1);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(25, x);
  EXPECT_EQ(40, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFPath_GetPathSegment(triangle, 2);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(40, x);
  EXPECT_EQ(10, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFPath_GetPathSegment(triangle, 3);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_TRUE(FPDFPathSegment_GetClose(segment));

  // Test FPDFPageObj_GetClipPath().
  ASSERT_EQ(nullptr, FPDFPageObj_GetClipPath(nullptr));

  FPDF_CLIPPATH clip_path = FPDFPageObj_GetClipPath(triangle);
  ASSERT_TRUE(clip_path);

  // Test FPDFClipPath_CountPaths().
  ASSERT_EQ(-1, FPDFClipPath_CountPaths(nullptr));
  ASSERT_EQ(1, FPDFClipPath_CountPaths(clip_path));

  // Test FPDFClipPath_CountPathSegments().
  ASSERT_EQ(-1, FPDFClipPath_CountPathSegments(nullptr, 0));
  ASSERT_EQ(-1, FPDFClipPath_CountPathSegments(clip_path, -1));
  ASSERT_EQ(-1, FPDFClipPath_CountPathSegments(clip_path, 1));
  ASSERT_EQ(4, FPDFClipPath_CountPathSegments(clip_path, 0));

  // FPDFClipPath_GetPathSegment() negative testing.
  ASSERT_EQ(nullptr, FPDFClipPath_GetPathSegment(nullptr, 0, 0));
  ASSERT_EQ(nullptr, FPDFClipPath_GetPathSegment(clip_path, -1, 0));
  ASSERT_EQ(nullptr, FPDFClipPath_GetPathSegment(clip_path, 1, 0));
  ASSERT_EQ(nullptr, FPDFClipPath_GetPathSegment(clip_path, 0, -1));
  ASSERT_EQ(nullptr, FPDFClipPath_GetPathSegment(clip_path, 0, 4));

  // FPDFClipPath_GetPathSegment() positive testing.
  segment = FPDFClipPath_GetPathSegment(clip_path, 0, 0);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(10, x);
  EXPECT_EQ(15, y);
  EXPECT_EQ(FPDF_SEGMENT_MOVETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFClipPath_GetPathSegment(clip_path, 0, 1);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(40, x);
  EXPECT_EQ(15, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFClipPath_GetPathSegment(clip_path, 0, 2);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(40, x);
  EXPECT_EQ(35, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFClipPath_GetPathSegment(clip_path, 0, 3);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_EQ(10, x);
  EXPECT_EQ(35, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, BUG_1399) {
  // Load document with a clipped rectangle.
  ASSERT_TRUE(OpenDocument("bug_1399.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  ASSERT_EQ(7, FPDFPage_CountObjects(page));

  FPDF_PAGEOBJECT obj = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(obj);

  ASSERT_EQ(2, FPDFPath_CountSegments(obj));

  FPDF_PATHSEGMENT segment = FPDFPath_GetPathSegment(obj, 0);
  float x;
  float y;
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_FLOAT_EQ(107.718f, x);
  EXPECT_FLOAT_EQ(719.922f, y);
  EXPECT_EQ(FPDF_SEGMENT_MOVETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  segment = FPDFPath_GetPathSegment(obj, 1);
  EXPECT_TRUE(FPDFPathSegment_GetPoint(segment, &x, &y));
  EXPECT_FLOAT_EQ(394.718f, x);
  EXPECT_FLOAT_EQ(719.922f, y);
  EXPECT_EQ(FPDF_SEGMENT_LINETO, FPDFPathSegment_GetType(segment));
  EXPECT_FALSE(FPDFPathSegment_GetClose(segment));

  FPDF_CLIPPATH clip_path = FPDFPageObj_GetClipPath(obj);
  ASSERT_TRUE(clip_path);

  EXPECT_EQ(-1, FPDFClipPath_CountPaths(clip_path));
  EXPECT_EQ(-1, FPDFClipPath_CountPathSegments(clip_path, 0));
  EXPECT_FALSE(FPDFClipPath_GetPathSegment(clip_path, 0, 0));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, BUG_1549) {
  static const char kOriginalChecksum[] = "126366fb95e6caf8ea196780075b22b2";
  static const char kRemovedChecksum[] = "6ec2f27531927882624b37bc7d8e12f4";

  ASSERT_TRUE(OpenDocument("bug_1549.pdf"));
  FPDF_PAGE page = LoadPage(0);

  {
    ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
    CompareBitmap(bitmap.get(), 100, 150, kOriginalChecksum);

    ScopedFPDFPageObject obj(FPDFPage_GetObject(page, 0));
    ASSERT_EQ(FPDF_PAGEOBJ_IMAGE, FPDFPageObj_GetType(obj.get()));
    ASSERT_TRUE(FPDFPage_RemoveObject(page, obj.get()));
  }

  ASSERT_TRUE(FPDFPage_GenerateContent(page));

  {
    ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
    CompareBitmap(bitmap.get(), 100, 150, kRemovedChecksum);
  }

  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // TODO(crbug.com/pdfium/1549): Should be `kRemovedChecksum`.
  VerifySavedDocument(100, 150, "4f9889cd5993db20f1ab37d677ac8d26");
}

TEST_F(FPDFEditEmbedderTest, SetText) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Get the "Hello, world!" text object and change it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  ScopedFPDFWideString text1 = GetFPDFWideString(L"Changed for SetText test");
  EXPECT_TRUE(FPDFText_SetText(page_object, text1.get()));

  // Verify the "Hello, world!" text is gone and "Changed for SetText test" is
  // now displayed.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  const char* changed_checksum = []() {
#if BUILDFLAG(IS_APPLE)
    if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "b720e83476fd6819d47c533f1f43c728";
#endif
    return "9a85b9354a69c61772ed24151c140f46";
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, changed_checksum);
  }

  // Now save the result.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));

  UnloadPage(page);

  // Re-open the file and check the changes were kept in the saved .pdf.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(2, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, changed_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, SetCharcodesBadParams) {
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);

  const uint32_t kDummyValue = 42;
  EXPECT_FALSE(FPDFText_SetCharcodes(nullptr, nullptr, 0));
  EXPECT_FALSE(FPDFText_SetCharcodes(nullptr, nullptr, 1));
  EXPECT_FALSE(FPDFText_SetCharcodes(nullptr, &kDummyValue, 0));
  EXPECT_FALSE(FPDFText_SetCharcodes(nullptr, &kDummyValue, 1));
  EXPECT_FALSE(FPDFText_SetCharcodes(page_object, nullptr, 1));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, SetTextKeepClippingPath) {
  // Load document with some text, with parts clipped.
  ASSERT_TRUE(OpenDocument("bug_1558.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  const char* original_checksum = []() {
#if BUILDFLAG(IS_APPLE)
    if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "ae7a25c85e0e2dd0c5cb9dd5cd37f6df";
#endif
    return "7af7fe5b281298261eb66ac2d22f5054";
  }();
  {
    // When opened before any editing and saving, the clipping path is rendered.
    ScopedFPDFBitmap original_bitmap = RenderPage(page);
    CompareBitmap(original_bitmap.get(), 200, 200, original_checksum);
  }

  // "Change" the text in the objects to their current values to force them to
  // regenerate when saving.
  {
    ScopedFPDFTextPage text_page(FPDFText_LoadPage(page));
    ASSERT_TRUE(text_page);
    const int obj_count = FPDFPage_CountObjects(page);
    ASSERT_EQ(2, obj_count);
    for (int i = 0; i < obj_count; ++i) {
      FPDF_PAGEOBJECT text_obj = FPDFPage_GetObject(page, i);
      ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(text_obj));
      unsigned long size =
          FPDFTextObj_GetText(text_obj, text_page.get(),
                              /*buffer=*/nullptr, /*length=*/0);
      ASSERT_GT(size, 0u);
      std::vector<FPDF_WCHAR> buffer = GetFPDFWideStringBuffer(size);
      ASSERT_EQ(size, FPDFTextObj_GetText(text_obj, text_page.get(),
                                          buffer.data(), size));
      EXPECT_TRUE(FPDFText_SetText(text_obj, buffer.data()));
    }
  }

  {
    // After editing but before saving, the clipping path is retained.
    ScopedFPDFBitmap edited_bitmap = RenderPage(page);
    CompareBitmap(edited_bitmap.get(), 200, 200, original_checksum);
  }

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Open the saved copy and render it.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  {
    ScopedFPDFBitmap saved_bitmap = RenderSavedPage(saved_page);
    CompareBitmap(saved_bitmap.get(), 200, 200, original_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, BUG_1574) {
  // Load document with some text within a clipping path.
  ASSERT_TRUE(OpenDocument("bug_1574.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  const char* original_checksum = []() {
#if BUILDFLAG(IS_APPLE)
    if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "1226bc2b8072622eb28f52321876e814";
#endif
    return "c5241eef60b9eac68ed1f2a5fd002703";
  }();
  {
    // When opened before any editing and saving, the text object is rendered.
    ScopedFPDFBitmap original_bitmap = RenderPage(page);
    CompareBitmap(original_bitmap.get(), 200, 300, original_checksum);
  }

  // "Change" the text in the objects to their current values to force them to
  // regenerate when saving.
  {
    ScopedFPDFTextPage text_page(FPDFText_LoadPage(page));
    ASSERT_TRUE(text_page);

    ASSERT_EQ(2, FPDFPage_CountObjects(page));
    FPDF_PAGEOBJECT text_obj = FPDFPage_GetObject(page, 1);
    ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(text_obj));

    unsigned long size = FPDFTextObj_GetText(text_obj, text_page.get(),
                                             /*buffer=*/nullptr, /*length=*/0);
    ASSERT_GT(size, 0u);
    std::vector<FPDF_WCHAR> buffer = GetFPDFWideStringBuffer(size);
    ASSERT_EQ(size, FPDFTextObj_GetText(text_obj, text_page.get(),
                                        buffer.data(), size));
    EXPECT_TRUE(FPDFText_SetText(text_obj, buffer.data()));
  }

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Open the saved copy and render it.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  {
    ScopedFPDFBitmap saved_bitmap = RenderSavedPage(saved_page);
    CompareBitmap(saved_bitmap.get(), 200, 300, original_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveTextObject) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Show what the original file looks like.
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Get the "Hello, world!" text object and remove it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  {
    ScopedFPDFPageObject page_object(FPDFPage_GetObject(page, 0));
    ASSERT_TRUE(page_object);
    ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(page_object.get()));
    EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object.get()));
  }
  ASSERT_EQ(1, FPDFPage_CountObjects(page));

  // Verify the "Hello, world!" text is gone.
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, FirstRemovedChecksum());
  }

  // Verify the rendering again after calling FPDFPage_GenerateContent().
  ASSERT_TRUE(FPDFPage_GenerateContent(page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, FirstRemovedChecksum());
  }

  // Save the document and verify it after reloading.
  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  VerifySavedDocument(200, 200, FirstRemovedChecksum());

  // Verify removed/renamed resources are no longer there.
  EXPECT_THAT(GetString(), Not(HasSubstr("/F1")));
  EXPECT_THAT(GetString(), Not(HasSubstr("/F2")));
  EXPECT_THAT(GetString(), Not(HasSubstr("/Times-Roman")));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest,
       RemoveTextObjectWithTwoPagesSharingContentStreamAndResources) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_2_pages.pdf"));
  FPDF_PAGE page1 = LoadPage(0);
  ASSERT_TRUE(page1);
  FPDF_PAGE page2 = LoadPage(1);
  ASSERT_TRUE(page2);

  // Show what the original file looks like.
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, HelloWorldChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Get the "Hello, world!" text object from page 1 and remove it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page1));
  {
    ScopedFPDFPageObject page_object(FPDFPage_GetObject(page1, 0));
    ASSERT_TRUE(page_object);
    ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(page_object.get()));
    EXPECT_TRUE(FPDFPage_RemoveObject(page1, page_object.get()));
  }
  ASSERT_EQ(1, FPDFPage_CountObjects(page1));

  // Verify the "Hello, world!" text is gone from page 1.
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Verify the rendering again after calling FPDFPage_GenerateContent().
  ASSERT_TRUE(FPDFPage_GenerateContent(page1));
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Save the document and verify it after reloading.
  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page1 = LoadSavedPage(0);
  VerifySavedRendering(saved_page1, 200, 200, FirstRemovedChecksum());
  CloseSavedPage(saved_page1);
  FPDF_PAGE saved_page2 = LoadSavedPage(1);
  VerifySavedRendering(saved_page2, 200, 200, HelloWorldChecksum());
  CloseSavedPage(saved_page2);
  CloseSavedDocument();

  std::vector<std::string> split_saved_data = StringSplit(GetString(), '\n');
  // Verify removed/renamed resources are in the save PDF the correct number of
  // times.
  EXPECT_THAT(split_saved_data, Contains(HasSubstr("/F1")).Times(1));
  EXPECT_THAT(split_saved_data, Contains(HasSubstr("/F2")).Times(1));
  EXPECT_THAT(split_saved_data, Contains(HasSubstr("/Times-Roman")).Times(1));

  UnloadPage(page1);
  UnloadPage(page2);
}

TEST_F(FPDFEditEmbedderTest,
       RemoveTextObjectWithTwoPagesSharingContentArrayAndResources) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_2_pages_split_streams.pdf"));
  FPDF_PAGE page1 = LoadPage(0);
  ASSERT_TRUE(page1);
  FPDF_PAGE page2 = LoadPage(1);
  ASSERT_TRUE(page2);

  // Show what the original file looks like.
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, HelloWorldChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Get the "Hello, world!" text object from page 1 and remove it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page1));
  {
    ScopedFPDFPageObject page_object(FPDFPage_GetObject(page1, 0));
    ASSERT_TRUE(page_object);
    ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(page_object.get()));
    EXPECT_TRUE(FPDFPage_RemoveObject(page1, page_object.get()));
  }
  ASSERT_EQ(1, FPDFPage_CountObjects(page1));

  // Verify the "Hello, world!" text is gone from page 1.
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Verify the rendering again after calling FPDFPage_GenerateContent().
  ASSERT_TRUE(FPDFPage_GenerateContent(page1));
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Save the document and verify it after reloading.
  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page1 = LoadSavedPage(0);
  VerifySavedRendering(saved_page1, 200, 200, FirstRemovedChecksum());
  CloseSavedPage(saved_page1);
  FPDF_PAGE saved_page2 = LoadSavedPage(1);
  VerifySavedRendering(saved_page2, 200, 200, HelloWorldChecksum());
  CloseSavedPage(saved_page2);
  CloseSavedDocument();

  UnloadPage(page1);
  UnloadPage(page2);
}

TEST_F(FPDFEditEmbedderTest, RemoveTextObjectWithTwoPagesSharingResourcesDict) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_2_pages_shared_resources_dict.pdf"));
  FPDF_PAGE page1 = LoadPage(0);
  ASSERT_TRUE(page1);
  FPDF_PAGE page2 = LoadPage(1);
  ASSERT_TRUE(page2);

  // Show what the original file looks like.
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, HelloWorldChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Get the "Hello, world!" text object from page 1 and remove it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page1));
  {
    ScopedFPDFPageObject page_object(FPDFPage_GetObject(page1, 0));
    ASSERT_TRUE(page_object);
    ASSERT_EQ(FPDF_PAGEOBJ_TEXT, FPDFPageObj_GetType(page_object.get()));
    EXPECT_TRUE(FPDFPage_RemoveObject(page1, page_object.get()));
  }
  ASSERT_EQ(1, FPDFPage_CountObjects(page1));

  // Verify the "Hello, world!" text is gone from page 1
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Verify the rendering again after calling FPDFPage_GenerateContent().
  ASSERT_TRUE(FPDFPage_GenerateContent(page1));
  {
    ScopedFPDFBitmap page1_bitmap = RenderPage(page1);
    CompareBitmap(page1_bitmap.get(), 200, 200, FirstRemovedChecksum());
    ScopedFPDFBitmap page2_bitmap = RenderPage(page2);
    CompareBitmap(page2_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Save the document and verify it after reloading.
  ASSERT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page1 = LoadSavedPage(0);
  VerifySavedRendering(saved_page1, 200, 200, FirstRemovedChecksum());
  CloseSavedPage(saved_page1);
  FPDF_PAGE saved_page2 = LoadSavedPage(1);
  VerifySavedRendering(saved_page2, 200, 200, HelloWorldChecksum());
  CloseSavedPage(saved_page2);
  CloseSavedDocument();

  UnloadPage(page1);
  UnloadPage(page2);
}

void CheckMarkCounts(FPDF_PAGE page,
                     int start_from,
                     int expected_object_count,
                     size_t expected_prime_count,
                     size_t expected_square_count,
                     size_t expected_greater_than_ten_count,
                     size_t expected_bounds_count) {
  int object_count = FPDFPage_CountObjects(page);
  ASSERT_EQ(expected_object_count, object_count);

  size_t prime_count = 0;
  size_t square_count = 0;
  size_t greater_than_ten_count = 0;
  size_t bounds_count = 0;
  for (int i = 0; i < object_count; ++i) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);

    int mark_count = FPDFPageObj_CountMarks(page_object);
    for (int j = 0; j < mark_count; ++j) {
      FPDF_PAGEOBJECTMARK mark = FPDFPageObj_GetMark(page_object, j);

      char buffer[256];
      unsigned long name_len = 999u;
      ASSERT_TRUE(
          FPDFPageObjMark_GetName(mark, buffer, sizeof(buffer), &name_len));
      EXPECT_GT(name_len, 0u);
      EXPECT_NE(999u, name_len);
      std::wstring name =
          GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
      if (name == L"Prime") {
        prime_count++;
      } else if (name == L"Square") {
        square_count++;
        int expected_square = start_from + i;
        EXPECT_EQ(1, FPDFPageObjMark_CountParams(mark));

        unsigned long get_param_key_return = 999u;
        ASSERT_TRUE(FPDFPageObjMark_GetParamKey(mark, 0, buffer, sizeof(buffer),
                                                &get_param_key_return));
        EXPECT_EQ((6u + 1u) * 2u, get_param_key_return);
        std::wstring key =
            GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
        EXPECT_EQ(L"Factor", key);

        EXPECT_EQ(FPDF_OBJECT_NUMBER,
                  FPDFPageObjMark_GetParamValueType(mark, "Factor"));
        int square_root;
        EXPECT_TRUE(
            FPDFPageObjMark_GetParamIntValue(mark, "Factor", &square_root));
        EXPECT_EQ(expected_square, square_root * square_root);
      } else if (name == L"GreaterThanTen") {
        greater_than_ten_count++;
      } else if (name == L"Bounds") {
        bounds_count++;
        EXPECT_EQ(1, FPDFPageObjMark_CountParams(mark));

        unsigned long get_param_key_return = 999u;
        ASSERT_TRUE(FPDFPageObjMark_GetParamKey(mark, 0, buffer, sizeof(buffer),
                                                &get_param_key_return));
        EXPECT_EQ((8u + 1u) * 2u, get_param_key_return);
        std::wstring key =
            GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
        EXPECT_EQ(L"Position", key);

        EXPECT_EQ(FPDF_OBJECT_STRING,
                  FPDFPageObjMark_GetParamValueType(mark, "Position"));
        unsigned long length;
        EXPECT_TRUE(FPDFPageObjMark_GetParamStringValue(
            mark, "Position", buffer, sizeof(buffer), &length));
        ASSERT_GT(length, 0u);
        std::wstring value =
            GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));

        // "Position" can be "First", "Last", or "End".
        if (i == 0) {
          EXPECT_EQ((5u + 1u) * 2u, length);
          EXPECT_EQ(L"First", value);
        } else if (i == object_count - 1) {
          if (length == (4u + 1u) * 2u) {
            EXPECT_EQ(L"Last", value);
          } else if (length == (3u + 1u) * 2u) {
            EXPECT_EQ(L"End", value);
          } else {
            FAIL();
          }
        } else {
          FAIL();
        }
      } else {
        FAIL();
      }
    }
  }

  // Expect certain number of tagged objects. The test file contains strings
  // from 1 to 19.
  EXPECT_EQ(expected_prime_count, prime_count);
  EXPECT_EQ(expected_square_count, square_count);
  EXPECT_EQ(expected_greater_than_ten_count, greater_than_ten_count);
  EXPECT_EQ(expected_bounds_count, bounds_count);
}

TEST_F(FPDFEditEmbedderTest, ReadMarkedObjectsIndirectDict) {
  // Load document with some text marked with an indirect property.
  ASSERT_TRUE(OpenDocument("text_in_page_marked_indirect.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  CheckMarkCounts(page, 1, 19, 8, 4, 9, 1);

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, RemoveMarkedObjectsPrime) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("text_in_page_marked.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Show what the original file looks like.
  {
    const char* original_checksum = []() {
      if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "34ac4e0f3ba510760be09d0e19c1b43e";
#if BUILDFLAG(IS_APPLE)
#ifdef ARCH_CPU_ARM64
      return "cdc8e22cf1e7e06999dc456288672a3b";
#else
      return "966579fb98206858ce2f0a1f94a74d05";
#endif  // ARCH_CPU_ARM64
#else
      return "3d5a3de53d5866044c2b6bf339742c97";
#endif  // BUILDFLAG(IS_APPLE)
    }();
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, original_checksum);
  }

  constexpr int expected_object_count = 19;
  CheckMarkCounts(page, 1, expected_object_count, 8, 4, 9, 1);

  // Get all objects marked with "Prime"
  std::vector<FPDF_PAGEOBJECT> primes;
  for (int i = 0; i < expected_object_count; ++i) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);

    int mark_count = FPDFPageObj_CountMarks(page_object);
    for (int j = 0; j < mark_count; ++j) {
      FPDF_PAGEOBJECTMARK mark = FPDFPageObj_GetMark(page_object, j);

      char buffer[256];
      unsigned long name_len = 999u;
      ASSERT_TRUE(
          FPDFPageObjMark_GetName(mark, buffer, sizeof(buffer), &name_len));
      EXPECT_GT(name_len, 0u);
      EXPECT_NE(999u, name_len);
      std::wstring name =
          GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
      if (name == L"Prime") {
        primes.push_back(page_object);
      }
    }
  }

  // Remove all objects marked with "Prime".
  for (FPDF_PAGEOBJECT page_object : primes) {
    EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));
    FPDFPageObj_Destroy(page_object);
  }

  EXPECT_EQ(11, FPDFPage_CountObjects(page));
  const char* non_primes_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "c671fa07b63e85c4201b9926e880fda8";
#if BUILDFLAG(IS_APPLE)
#ifdef ARCH_CPU_ARM64
    return "23c4aec321547f51591fe7363a9ea2d6";
#else
    return "6e19a4dd674b522cd39cf41956559bd6";
#endif  // ARCH_CPU_ARM64
#else
    return "bc8623c052f12376c3d8dd09a6cd27df";
#endif  // BUILDFLAG(IS_APPLE)
  }();
  const char* non_primes_after_save_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "c671fa07b63e85c4201b9926e880fda8";
#if BUILDFLAG(IS_APPLE)
#ifdef ARCH_CPU_ARM64
    return "6bb1ea0d0a512f29edabda33064a0725";
#else
    return "3cb35c681f8fb5a43a49146ac7caa818";
#endif  // ARCH_CPU_ARM64
#else
    return "bc8623c052f12376c3d8dd09a6cd27df";
#endif  // BUILDFLAG(IS_APPLE)
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, non_primes_checksum);
  }

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the prime marks are not there anymore.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(11, FPDFPage_CountObjects(saved_page));

  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, non_primes_after_save_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveMarks) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("text_in_page_marked.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  constexpr int kExpectedObjectCount = 19;
  CheckMarkCounts(page, 1, kExpectedObjectCount, 8, 4, 9, 1);

  // Remove all "Prime" content marks.
  for (int i = 0; i < kExpectedObjectCount; ++i) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);

    int mark_count = FPDFPageObj_CountMarks(page_object);
    for (int j = mark_count - 1; j >= 0; --j) {
      FPDF_PAGEOBJECTMARK mark = FPDFPageObj_GetMark(page_object, j);

      char buffer[256];
      unsigned long name_len = 999u;
      ASSERT_TRUE(
          FPDFPageObjMark_GetName(mark, buffer, sizeof(buffer), &name_len));
      EXPECT_GT(name_len, 0u);
      EXPECT_NE(999u, name_len);
      std::wstring name =
          GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
      if (name == L"Prime") {
        // Remove mark.
        EXPECT_TRUE(FPDFPageObj_RemoveMark(page_object, mark));

        // Verify there is now one fewer mark in the page object.
        EXPECT_EQ(mark_count - 1, FPDFPageObj_CountMarks(page_object));
      }
    }
  }

  // Verify there are 0 "Prime" content marks now.
  CheckMarkCounts(page, 1, kExpectedObjectCount, 0, 4, 9, 1);

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the prime marks are not there anymore.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  CheckMarkCounts(saved_page, 1, kExpectedObjectCount, 0, 4, 9, 1);

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveMarkParam) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("text_in_page_marked.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  constexpr int kExpectedObjectCount = 19;
  CheckMarkCounts(page, 1, kExpectedObjectCount, 8, 4, 9, 1);

  // Remove all "Square" content marks parameters.
  for (int i = 0; i < kExpectedObjectCount; ++i) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);

    int mark_count = FPDFPageObj_CountMarks(page_object);
    for (int j = 0; j < mark_count; ++j) {
      FPDF_PAGEOBJECTMARK mark = FPDFPageObj_GetMark(page_object, j);

      char buffer[256];
      unsigned long name_len = 999u;
      ASSERT_TRUE(
          FPDFPageObjMark_GetName(mark, buffer, sizeof(buffer), &name_len));
      EXPECT_GT(name_len, 0u);
      EXPECT_NE(999u, name_len);
      std::wstring name =
          GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
      if (name == L"Square") {
        // Show the mark has a "Factor" parameter.
        int out_value;
        EXPECT_TRUE(
            FPDFPageObjMark_GetParamIntValue(mark, "Factor", &out_value));

        // Remove parameter.
        EXPECT_TRUE(FPDFPageObjMark_RemoveParam(page_object, mark, "Factor"));

        // Verify the "Factor" parameter is gone.
        EXPECT_FALSE(
            FPDFPageObjMark_GetParamIntValue(mark, "Factor", &out_value));
      }
    }
  }

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the "Factor" parameters are still gone.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  size_t square_count = 0;
  for (int i = 0; i < kExpectedObjectCount; ++i) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(saved_page, i);

    int mark_count = FPDFPageObj_CountMarks(page_object);
    for (int j = 0; j < mark_count; ++j) {
      FPDF_PAGEOBJECTMARK mark = FPDFPageObj_GetMark(page_object, j);

      char buffer[256];
      unsigned long name_len = 999u;
      ASSERT_TRUE(
          FPDFPageObjMark_GetName(mark, buffer, sizeof(buffer), &name_len));
      EXPECT_GT(name_len, 0u);
      EXPECT_NE(999u, name_len);
      std::wstring name =
          GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
      if (name == L"Square") {
        // Verify the "Factor" parameter is still gone.
        int out_value;
        EXPECT_FALSE(
            FPDFPageObjMark_GetParamIntValue(mark, "Factor", &out_value));

        ++square_count;
      }
    }
  }

  // Verify the parameters are gone, but the marks are not.
  EXPECT_EQ(4u, square_count);

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, MaintainMarkedObjects) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("text_in_page_marked.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Iterate over all objects, counting the number of times each content mark
  // name appears.
  CheckMarkCounts(page, 1, 19, 8, 4, 9, 1);

  // Remove first page object.
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));
  FPDFPageObj_Destroy(page_object);

  CheckMarkCounts(page, 2, 18, 8, 3, 9, 1);

  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));

  UnloadPage(page);

  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  CheckMarkCounts(saved_page, 2, 18, 8, 3, 9, 1);

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, MaintainIndirectMarkedObjects) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("text_in_page_marked_indirect.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Iterate over all objects, counting the number of times each content mark
  // name appears.
  CheckMarkCounts(page, 1, 19, 8, 4, 9, 1);

  // Remove first page object.
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));
  FPDFPageObj_Destroy(page_object);

  CheckMarkCounts(page, 2, 18, 8, 3, 9, 1);

  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));

  UnloadPage(page);

  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  CheckMarkCounts(saved_page, 2, 18, 8, 3, 9, 1);

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveExistingPageObject) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Get the "Hello, world!" text object and remove it.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));

  // Verify the "Hello, world!" text is gone.
  ASSERT_EQ(1, FPDFPage_CountObjects(page));

  // Save the file
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);
  FPDFPageObj_Destroy(page_object);

  // Re-open the file and check the page object count is still 1.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(1, FPDFPage_CountObjects(saved_page));
  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveExistingPageObjectSplitStreamsNotLonely) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_split_streams.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Get the "Hello, world!" text object and remove it. There is another object
  // in the same stream that says "Goodbye, world!"
  ASSERT_EQ(3, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));

  // Verify the "Hello, world!" text is gone.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  const char* hello_removed_checksum = []() {
#if BUILDFLAG(IS_APPLE)
    if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "5508c2f06d104050f74f655693e38c2c";
#endif
    return "a8cd82499cf744e0862ca468c9d4ceb8";
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, hello_removed_checksum);
  }

  // Save the file
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);
  FPDFPageObj_Destroy(page_object);

  // Re-open the file and check the page object count is still 2.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  EXPECT_EQ(2, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, hello_removed_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveExistingPageObjectSplitStreamsLonely) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_split_streams.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Get the "Greetings, world!" text object and remove it. This is the only
  // object in the stream.
  ASSERT_EQ(3, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 2);
  ASSERT_TRUE(page_object);
  EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));

  // Verify the "Greetings, world!" text is gone.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  // Save the file
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);
  FPDFPageObj_Destroy(page_object);

  // Re-open the file and check the page object count is still 2.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  EXPECT_EQ(2, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, HelloWorldChecksum());
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, GetContentStream) {
  // Load document with some text split across streams.
  ASSERT_TRUE(OpenDocument("split_streams.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-14.
  // Content stream 1: page objects 15-17.
  // Content stream 2: page object 18.
  ASSERT_EQ(19, FPDFPage_CountObjects(page));
  for (int i = 0; i < 19; i++) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);
    if (i < 15)
      EXPECT_EQ(0, cpdf_page_object->GetContentStream()) << i;
    else if (i < 18)
      EXPECT_EQ(1, cpdf_page_object->GetContentStream()) << i;
    else
      EXPECT_EQ(2, cpdf_page_object->GetContentStream()) << i;
  }

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, RemoveAllFromStream) {
  // Load document with some text split across streams.
  ASSERT_TRUE(OpenDocument("split_streams.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-14.
  // Content stream 1: page objects 15-17.
  // Content stream 2: page object 18.
  ASSERT_EQ(19, FPDFPage_CountObjects(page));

  // Loop backwards because objects will being removed, which shifts the indexes
  // after the removed position.
  for (int i = 18; i >= 0; i--) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);

    // Empty content stream 1.
    if (cpdf_page_object->GetContentStream() == 1) {
      EXPECT_TRUE(FPDFPage_RemoveObject(page, page_object));
      FPDFPageObj_Destroy(page_object);
    }
  }

  // Content stream 0: page objects 0-14.
  // Content stream 2: page object 15.
  ASSERT_EQ(16, FPDFPage_CountObjects(page));
  for (int i = 0; i < 16; i++) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);
    if (i < 15)
      EXPECT_EQ(0, cpdf_page_object->GetContentStream()) << i;
    else
      EXPECT_EQ(2, cpdf_page_object->GetContentStream()) << i;
  }

  // Generate contents should remove the empty stream and update the page
  // objects' contents stream indexes.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  // Content stream 0: page objects 0-14.
  // Content stream 1: page object 15.
  ASSERT_EQ(16, FPDFPage_CountObjects(page));
  for (int i = 0; i < 16; i++) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);
    if (i < 15)
      EXPECT_EQ(0, cpdf_page_object->GetContentStream()) << i;
    else
      EXPECT_EQ(1, cpdf_page_object->GetContentStream()) << i;
  }

  const char* stream1_removed_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "b9bb0acfdba4bb5d2e578e7b73341baf";
#if BUILDFLAG(IS_APPLE)
#if ARCH_CPU_ARM64
    return "08505db7b598f7397a2260ecb1f6d86d";
#else
    return "3cdc75af44c15bed80998facd6e674c9";
#endif  // ARCH_CPU_ARM64
#else
    return "b474826df1acedb05c7b82e1e49e64a6";
#endif  // BUILDFLAG(IS_APPLE)
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, stream1_removed_checksum);
  }

  // Save the file
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 16, and that
  // content stream 1 was removed.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  // Content stream 0: page objects 0-14.
  // Content stream 1: page object 15.
  EXPECT_EQ(16, FPDFPage_CountObjects(saved_page));
  for (int i = 0; i < 16; i++) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(saved_page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);
    if (i < 15)
      EXPECT_EQ(0, cpdf_page_object->GetContentStream()) << i;
    else
      EXPECT_EQ(1, cpdf_page_object->GetContentStream()) << i;
  }

  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, stream1_removed_checksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveAllFromSingleStream) {
  // Load document with a single stream.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-1.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  // Loop backwards because objects will being removed, which shifts the indexes
  // after the removed position.
  for (int i = 1; i >= 0; i--) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    CPDF_PageObject* cpdf_page_object =
        CPDFPageObjectFromFPDFPageObject(page_object);
    ASSERT_EQ(0, cpdf_page_object->GetContentStream());
    ASSERT_TRUE(FPDFPage_RemoveObject(page, page_object));
    FPDFPageObj_Destroy(page_object);
  }

  // No more objects in the stream
  ASSERT_EQ(0, FPDFPage_CountObjects(page));

  // Generate contents should remove the empty stream and update the page
  // objects' contents stream indexes.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  ASSERT_EQ(0, FPDFPage_CountObjects(page));

  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, kAllRemovedChecksum);
  }

  // Save the file
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 0.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  EXPECT_EQ(0, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, kAllRemovedChecksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveFirstFromSingleStream) {
  // Load document with a single stream.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-1.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  // Remove first object.
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  CPDF_PageObject* cpdf_page_object =
      CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());
  ASSERT_TRUE(FPDFPage_RemoveObject(page, page_object));
  FPDFPageObj_Destroy(page_object);

  // One object left in the stream.
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());

  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  // Still one object left in the stream.
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());

  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, FirstRemovedChecksum());
  }

  // Save the file
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 0.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  ASSERT_EQ(1, FPDFPage_CountObjects(saved_page));
  page_object = FPDFPage_GetObject(saved_page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, FirstRemovedChecksum());
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveLastFromSingleStream) {
  // Load document with a single stream.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-1.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  // Remove last object
  FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 1);
  ASSERT_TRUE(page_object);
  CPDF_PageObject* cpdf_page_object =
      CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());
  ASSERT_TRUE(FPDFPage_RemoveObject(page, page_object));
  FPDFPageObj_Destroy(page_object);

  // One object left in the stream.
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());

  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  // Still one object left in the stream.
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  page_object = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());

  using pdfium::HelloWorldRemovedChecksum;
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, HelloWorldRemovedChecksum());
  }

  // Save the file
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 0.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  ASSERT_EQ(1, FPDFPage_CountObjects(saved_page));
  page_object = FPDFPage_GetObject(saved_page, 0);
  ASSERT_TRUE(page_object);
  cpdf_page_object = CPDFPageObjectFromFPDFPageObject(page_object);
  ASSERT_EQ(0, cpdf_page_object->GetContentStream());
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, HelloWorldRemovedChecksum());
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, RemoveAllFromMultipleStreams) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world_split_streams.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Content stream 0: page objects 0-1.
  // Content stream 1: page object 2.
  ASSERT_EQ(3, FPDFPage_CountObjects(page));

  // Loop backwards because objects will being removed, which shifts the indexes
  // after the removed position.
  for (int i = 2; i >= 0; i--) {
    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, i);
    ASSERT_TRUE(page_object);
    ASSERT_TRUE(FPDFPage_RemoveObject(page, page_object));
    FPDFPageObj_Destroy(page_object);
  }

  // No more objects in the page.
  ASSERT_EQ(0, FPDFPage_CountObjects(page));

  // Generate contents should remove the empty streams and update the page
  // objects' contents stream indexes.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  ASSERT_EQ(0, FPDFPage_CountObjects(page));

  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 200, kAllRemovedChecksum);
  }

  // Save the file
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 0.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);

  EXPECT_EQ(0, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 200, kAllRemovedChecksum);
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, InsertPageObjectAndSave) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Add a red rectangle.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(20, 100, 50, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect);

  // Verify the red rectangle was added.
  ASSERT_EQ(3, FPDFPage_CountObjects(page));

  // Save the file
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 3.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(3, FPDFPage_CountObjects(saved_page));
  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, InsertPageObjectEditAndSave) {
  // Load document with some text.
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Add a red rectangle.
  ASSERT_EQ(2, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(20, 100, 50, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 100, 100, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect);

  // Verify the red rectangle was added.
  ASSERT_EQ(3, FPDFPage_CountObjects(page));

  // Generate content but change it again
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));

  // Save the file
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the page object count is still 3.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(3, FPDFPage_CountObjects(saved_page));
  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, InsertAndRemoveLargeFile) {
  const int kOriginalObjectCount = 600;

  // Load document with many objects.
  ASSERT_TRUE(OpenDocument("many_rectangles.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  using pdfium::ManyRectanglesChecksum;
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 300, ManyRectanglesChecksum());
  }

  // Add a black rectangle.
  ASSERT_EQ(kOriginalObjectCount, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT black_rect = FPDFPageObj_CreateNewRect(20, 100, 50, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(black_rect, 0, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(black_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, black_rect);

  // Verify the black rectangle was added.
  ASSERT_EQ(kOriginalObjectCount + 1, FPDFPage_CountObjects(page));
  const char* plus_rectangle_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "0d3715fcfb9bd0dd25dcce60800bff47";
    return "6b9396ab570754b32b04ca629e902f77";
  }();
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 200, 300, plus_rectangle_checksum);
  }

  // Save the file.
  EXPECT_TRUE(FPDFPage_GenerateContent(page));
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  // Re-open the file and check the rectangle added is still there.
  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(kOriginalObjectCount + 1, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 300, plus_rectangle_checksum);
  }

  // Remove the added rectangle.
  FPDF_PAGEOBJECT added_object =
      FPDFPage_GetObject(saved_page, kOriginalObjectCount);
  EXPECT_TRUE(FPDFPage_RemoveObject(saved_page, added_object));
  FPDFPageObj_Destroy(added_object);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 300, ManyRectanglesChecksum());
  }
  EXPECT_EQ(kOriginalObjectCount, FPDFPage_CountObjects(saved_page));

  // Save the file again.
  EXPECT_TRUE(FPDFPage_GenerateContent(saved_page));
  EXPECT_TRUE(FPDF_SaveAsCopy(saved_document(), this, 0));

  CloseSavedPage(saved_page);
  CloseSavedDocument();

  // Re-open the file (again) and check the black rectangle was removed and the
  // rest is intact.
  ASSERT_TRUE(OpenSavedDocument());
  saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  EXPECT_EQ(kOriginalObjectCount, FPDFPage_CountObjects(saved_page));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(saved_page);
    CompareBitmap(page_bitmap.get(), 200, 300, ManyRectanglesChecksum());
  }

  CloseSavedPage(saved_page);
  CloseSavedDocument();
}

TEST_F(FPDFEditEmbedderTest, AddAndRemovePaths) {
  // Start with a blank page.
  FPDF_PAGE page = FPDFPage_New(CreateNewDocument(), 0, 612, 792);
  ASSERT_TRUE(page);

  // Render the blank page and verify it's a blank bitmap.
  using pdfium::kBlankPage612By792Checksum;
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792, kBlankPage612By792Checksum);
  }
  ASSERT_EQ(0, FPDFPage_CountObjects(page));

  // Add a red rectangle.
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(10, 10, 20, 20);
  ASSERT_TRUE(red_rect);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792, kRedRectangleChecksum);
  }
  EXPECT_EQ(1, FPDFPage_CountObjects(page));

  // Remove rectangle and verify it does not render anymore and the bitmap is
  // back to a blank one.
  EXPECT_TRUE(FPDFPage_RemoveObject(page, red_rect));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    CompareBitmap(page_bitmap.get(), 612, 792, kBlankPage612By792Checksum);
  }
  EXPECT_EQ(0, FPDFPage_CountObjects(page));

  // Trying to remove an object not in the page should return false.
  EXPECT_FALSE(FPDFPage_RemoveObject(page, red_rect));

  FPDF_ClosePage(page);
  FPDFPageObj_Destroy(red_rect);
}

TEST_F(FPDFEditEmbedderTest, PathsPoints) {
  CreateNewDocument();
  FPDF_PAGEOBJECT img = FPDFPageObj_NewImageObj(document());
  // This should fail gracefully, even if img is not a path.
  ASSERT_EQ(-1, FPDFPath_CountSegments(img));

  // This should fail gracefully, even if path is NULL.
  ASSERT_EQ(-1, FPDFPath_CountSegments(nullptr));

  // FPDFPath_GetPathSegment() with a non-path.
  ASSERT_EQ(nullptr, FPDFPath_GetPathSegment(img, 0));
  // FPDFPath_GetPathSegment() with a NULL path.
  ASSERT_EQ(nullptr, FPDFPath_GetPathSegment(nullptr, 0));
  float x;
  float y;
  // FPDFPathSegment_GetPoint() with a NULL segment.
  EXPECT_FALSE(FPDFPathSegment_GetPoint(nullptr, &x, &y));

  // FPDFPathSegment_GetType() with a NULL segment.
  ASSERT_EQ(FPDF_SEGMENT_UNKNOWN, FPDFPathSegment_GetType(nullptr));

  // FPDFPathSegment_GetClose() with a NULL segment.
  EXPECT_FALSE(FPDFPathSegment_GetClose(nullptr));

  FPDFPageObj_Destroy(img);
}

TEST_F(FPDFEditEmbedderTest, PathOnTopOfText) {
  // Load document with some text
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Add an opaque rectangle on top of some of the text.
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(20, 100, 50, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect);

  // Add a transparent triangle on top of other part of the text.
  FPDF_PAGEOBJECT black_path = FPDFPageObj_CreateNewPath(20, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(black_path, 0, 0, 0, 100));
  EXPECT_TRUE(FPDFPath_SetDrawMode(black_path, FPDF_FILLMODE_ALTERNATE, 0));
  EXPECT_TRUE(FPDFPath_LineTo(black_path, 30, 80));
  EXPECT_TRUE(FPDFPath_LineTo(black_path, 40, 10));
  EXPECT_TRUE(FPDFPath_Close(black_path));
  FPDFPage_InsertObject(page, black_path);

  // Render and check the result.
  ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
  const char* checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "8a48b019826492331454f2809990aba8";
#if BUILDFLAG(IS_APPLE)
    return "279693baca9f48da2d75a8e289aed58e";
#else
    return "fe415d47945c10b9cc8e9ca08887369e";
#endif
  }();
  CompareBitmap(bitmap.get(), 200, 200, checksum);
  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, EditOverExistingContent) {
  // Load document with existing content
  ASSERT_TRUE(OpenDocument("bug_717.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);

  // Add a transparent rectangle on top of the existing content
  FPDF_PAGEOBJECT red_rect2 = FPDFPageObj_CreateNewRect(90, 700, 25, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect2, 255, 0, 0, 100));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect2, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect2);

  // Add an opaque rectangle on top of the existing content
  FPDF_PAGEOBJECT red_rect = FPDFPageObj_CreateNewRect(115, 700, 25, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(red_rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(red_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(page, red_rect);

  const char* original_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "1e82fbdd21490cee9d3479fe6125af67";
    return "ad04e5bd0f471a9a564fb034bd0fb073";
  }();
  ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
  CompareBitmap(bitmap.get(), 612, 792, original_checksum);
  EXPECT_TRUE(FPDFPage_GenerateContent(page));

  // Now save the result, closing the page and document
  EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
  UnloadPage(page);

  ASSERT_TRUE(OpenSavedDocument());
  FPDF_PAGE saved_page = LoadSavedPage(0);
  ASSERT_TRUE(saved_page);
  VerifySavedRendering(saved_page, 612, 792, original_checksum);

  ClearString();
  // Add another opaque rectangle on top of the existing content
  FPDF_PAGEOBJECT green_rect = FPDFPageObj_CreateNewRect(150, 700, 25, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(green_rect, 0, 255, 0, 255));
  EXPECT_TRUE(FPDFPath_SetDrawMode(green_rect, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(saved_page, green_rect);

  // Add another transparent rectangle on top of existing content
  FPDF_PAGEOBJECT green_rect2 = FPDFPageObj_CreateNewRect(175, 700, 25, 50);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(green_rect2, 0, 255, 0, 100));
  EXPECT_TRUE(FPDFPath_SetDrawMode(green_rect2, FPDF_FILLMODE_ALTERNATE, 0));
  FPDFPage_InsertObject(saved_page, green_rect2);
  const char* last_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "8705d023e5fec3499d1e30cf2bcc5dc1";
    return "4b5b00f824620f8c9b8801ebb98e1cdd";
  }();
  {
    ScopedFPDFBitmap new_bitmap = RenderSavedPage(saved_page);
    CompareBitmap(new_bitmap.get(), 612, 792, last_checksum);
  }
  EXPECT_TRUE(FPDFPage_GenerateContent(saved_page));

  // Now save the result, closing the page and document
  EXPECT_TRUE(FPDF_SaveAsCopy(saved_document(), this, 0));

  CloseSavedPage(saved_page);
  CloseSavedDocument();

  // Render the saved result
  VerifySavedDocument(612, 792, last_checksum);
}

TEST_F(FPDFEditEmbedderTest, AddStrokedPaths) {
  // Start with a blank page
  FPDF_PAGE page = FPDFPage_New(CreateNewDocument(), 0, 612, 792);

  // Add a large stroked rectangle (fill color should not affect it).
  FPDF_PAGEOBJECT rect = FPDFPageObj_CreateNewRect(20, 20, 200, 400);
  EXPECT_TRUE(FPDFPageObj_SetFillColor(rect, 255, 0, 0, 255));
  EXPECT_TRUE(FPDFPageObj_SetStrokeColor(rect, 0, 255, 0, 255));
  EXPECT_TRUE(FPDFPageObj_SetStrokeWidth(rect, 15.0f));

  float width = 0;
  EXPECT_TRUE(FPDFPageObj_GetStrokeWidth(rect, &width));
  EXPECT_EQ(15.0f, width);

  EXPECT_TRUE(FPDFPath_SetDrawMode(rect, 0, 1));
  FPDFPage_InsertObject(page, rect);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    const char* checksum_1 = []() {
      if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "1469acf60e7647ebeb8e1fb08c5d6c7a";
      return "64bd31f862a89e0a9e505a5af6efd506";
    }();
    CompareBitmap(page_bitmap.get(), 612, 792, checksum_1);
  }

  // Add crossed-checkmark
  FPDF_PAGEOBJECT check = FPDFPageObj_CreateNewPath(300, 500);
  EXPECT_TRUE(FPDFPath_LineTo(check, 400, 400));
  EXPECT_TRUE(FPDFPath_LineTo(check, 600, 600));
  EXPECT_TRUE(FPDFPath_MoveTo(check, 400, 600));
  EXPECT_TRUE(FPDFPath_LineTo(check, 600, 400));
  EXPECT_TRUE(FPDFPageObj_SetStrokeColor(check, 128, 128, 128, 180));
  EXPECT_TRUE(FPDFPageObj_SetStrokeWidth(check, 8.35f));
  EXPECT_TRUE(FPDFPath_SetDrawMode(check, 0, 1));
  FPDFPage_InsertObject(page, check);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    const char* checksum_2 = []() {
      if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "68b3194f74abd9d471695ce1415be43f";
      return "4b6f3b9d25c4e194821217d5016c3724";
    }();
    CompareBitmap(page_bitmap.get(), 612, 792, checksum_2);
  }

  // Add stroked and filled oval-ish path.
  FPDF_PAGEOBJECT path = FPDFPageObj_CreateNewPath(250, 100);
  EXPECT_TRUE(FPDFPath_BezierTo(path, 180, 166, 180, 233, 250, 300));
  EXPECT_TRUE(FPDFPath_LineTo(path, 255, 305));
  EXPECT_TRUE(FPDFPath_BezierTo(path, 325, 233, 325, 166, 255, 105));
  EXPECT_TRUE(FPDFPath_Close(path));
  EXPECT_TRUE(FPDFPageObj_SetFillColor(path, 200, 128, 128, 100));
  EXPECT_TRUE(FPDFPageObj_SetStrokeColor(path, 128, 200, 128, 150));
  EXPECT_TRUE(FPDFPageObj_SetStrokeWidth(path, 10.5f));
  EXPECT_TRUE(FPDFPath_SetDrawMode(path, FPDF_FILLMODE_ALTERNATE, 1));
  FPDFPage_InsertObject(page, path);
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page);
    const char* checksum_3 = []() {
      if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "ea784068651df2b9ba132ce9215e6780";
      return "ff3e6a22326754944cc6e56609acd73b";
    }();
    CompareBitmap(page_bitmap.get(), 612, 792, checksum_3);
  }
  FPDF_ClosePage(page);
}

// Tests adding text from standard font using FPDFPageObj_NewTextObj.
TEST_F(FPDFEditEmbedderTest, AddStandardFontText) {
  // Start with a blank page
  ScopedFPDFPage page(FPDFPage_New(CreateNewDocument(), 0, 612, 792));

  // Add some text to the page
  FPDF_PAGEOBJECT text_object1 =
      FPDFPageObj_NewTextObj(document(), "Arial", 12.0f);
  EXPECT_TRUE(text_object1);
  ScopedFPDFWideString text1 = GetFPDFWideString(kBottomText);
  EXPECT_TRUE(FPDFText_SetText(text_object1, text1.get()));
  static constexpr FS_MATRIX kMatrix1{1, 0, 0, 1, 20, 20};
  EXPECT_TRUE(FPDFPageObj_SetMatrix(text_object1, &kMatrix1));
  FPDFPage_InsertObject(page.get(), text_object1);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
    CompareBitmap(page_bitmap.get(), 612, 792, BottomTextChecksum());

    EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
    VerifySavedDocument(612, 792, BottomTextChecksum());
  }

  // Try another font
  FPDF_PAGEOBJECT text_object2 =
      FPDFPageObj_NewTextObj(document(), "TimesNewRomanBold", 15.0f);
  EXPECT_TRUE(text_object2);
  ScopedFPDFWideString text2 =
      GetFPDFWideString(L"Hi, I'm Bold. Times New Roman Bold.");
  EXPECT_TRUE(FPDFText_SetText(text_object2, text2.get()));
  FPDFPageObj_Transform(text_object2, 1, 0, 0, 1, 100, 600);
  FPDFPage_InsertObject(page.get(), text_object2);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
    const char* checksum = []() {
#if BUILDFLAG(IS_APPLE)
      if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "983baaa1f688eff7a14b1bf91c171a1a";
#endif
      return "161523e196eb5341604cd73e12c97922";
    }();
    CompareBitmap(page_bitmap.get(), 612, 792, checksum);

    EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
    VerifySavedDocument(612, 792, checksum);
  }

  // And some randomly transformed text
  FPDF_PAGEOBJECT text_object3 =
      FPDFPageObj_NewTextObj(document(), "Courier-Bold", 20.0f);
  EXPECT_TRUE(text_object3);
  ScopedFPDFWideString text3 = GetFPDFWideString(L"Can you read me? <:)>");
  EXPECT_TRUE(FPDFText_SetText(text_object3, text3.get()));
  FPDFPageObj_Transform(text_object3, 1, 1.5, 2, 0.5, 200, 200);
  FPDFPage_InsertObject(page.get(), text_object3);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
    const char* checksum = []() {
#if BUILDFLAG(IS_APPLE)
      if (!CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
        return "e0b3493c5c16e41d0d892ffb48e63fba";
#endif
      return "1fbf772dca8d82b960631e6683934964";
    }();
    CompareBitmap(page_bitmap.get(), 612, 792, checksum);

    EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
    VerifySavedDocument(612, 792, checksum);
  }

  FS_MATRIX matrix;
  EXPECT_TRUE(FPDFPageObj_GetMatrix(text_object3, &matrix));
  EXPECT_FLOAT_EQ(1.0f, matrix.a);
  EXPECT_FLOAT_EQ(1.5f, matrix.b);
  EXPECT_FLOAT_EQ(2.0f, matrix.c);
  EXPECT_FLOAT_EQ(0.5f, matrix.d);
  EXPECT_FLOAT_EQ(200.0f, matrix.e);
  EXPECT_FLOAT_EQ(200.0f, matrix.f);

  EXPECT_FALSE(FPDFTextObj_GetFontSize(nullptr, nullptr));
  float size = 55;
  EXPECT_FALSE(FPDFTextObj_GetFontSize(nullptr, &size));
  EXPECT_EQ(55, size);
  EXPECT_TRUE(FPDFTextObj_GetFontSize(text_object3, &size));
  EXPECT_EQ(20, size);

  // TODO(npm): Why are there issues with text rotated by 90 degrees?
  // TODO(npm): FPDF_SaveAsCopy not giving the desired result after this.
}

TEST_F(FPDFEditEmbedderTest, AddStandardFontTextOfSizeZero) {
  // Start with a blank page
  ScopedFPDFPage page(FPDFPage_New(CreateNewDocument(), 0, 612, 792));

  // Add some text of size 0 to the page.
  FPDF_PAGEOBJECT text_object =
      FPDFPageObj_NewTextObj(document(), "Arial", 0.0f);
  EXPECT_TRUE(text_object);
  ScopedFPDFWideString text = GetFPDFWideString(kBottomText);
  EXPECT_TRUE(FPDFText_SetText(text_object, text.get()));
  FPDFPageObj_Transform(text_object, 1, 0, 0, 1, 20, 20);

  float size = -1;  // Make sure 'size' gets changed.
  EXPECT_TRUE(FPDFTextObj_GetFontSize(text_object, &size));
  EXPECT_EQ(0.0f, size);

  FPDFPage_InsertObject(page.get(), text_object);
  EXPECT_TRUE(FPDFPage_GenerateContent(page.get()));
  {
    ScopedFPDFBitmap page_bitmap = RenderPage(page.get());
    CompareBitmap(page_bitmap.get(), 612, 792,
                  pdfium::kBlankPage612By792Checksum);

    EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
    VerifySavedDocument(612, 792, pdfium::kBlankPage612By792Checksum);
  }
}

TEST_F(FPDFEditEmbedderTest, GetTextRenderMode) {
  ASSERT_TRUE(OpenDocument("text_render_mode.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  EXPECT_EQ(FPDF_TEXTRENDERMODE_UNKNOWN,
            FPDFTextObj_GetTextRenderMode(nullptr));

  FPDF_PAGEOBJECT fill = FPDFPage_GetObject(page, 0);
  EXPECT_EQ(FPDF_TEXTRENDERMODE_FILL, FPDFTextObj_GetTextRenderMode(fill));

  FPDF_PAGEOBJECT stroke = FPDFPage_GetObject(page, 1);
  EXPECT_EQ(FPDF_TEXTRENDERMODE_STROKE, FPDFTextObj_GetTextRenderMode(stroke));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, SetTextRenderMode) {
  const char* original_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "39a4ac8f1fdc6653edd3b91862ea7b75";
#if BUILDFLAG(IS_APPLE)
    return "c488514ce0fc949069ff560407edacd2";
#else
    return "97a4fcf3c9581e19917895631af31d41";
#endif
  }();
  const char* stroke_checksum = []() {
    if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
      return "d16eb1bb4748eeb5fb801594da70d519";
    return "e06ee84aeebe926e8c980b7822027e8a";
  }();

  {
    ASSERT_TRUE(OpenDocument("text_render_mode.pdf"));
    FPDF_PAGE page = LoadPage(0);
    ASSERT_TRUE(page);
    ASSERT_EQ(2, FPDFPage_CountObjects(page));

    // Check the bitmap
    {
      ScopedFPDFBitmap page_bitmap = RenderPage(page);
      CompareBitmap(page_bitmap.get(), 612, 446, original_checksum);
    }

    // Cannot set on a null object.
    EXPECT_FALSE(
        FPDFTextObj_SetTextRenderMode(nullptr, FPDF_TEXTRENDERMODE_UNKNOWN));
    EXPECT_FALSE(
        FPDFTextObj_SetTextRenderMode(nullptr, FPDF_TEXTRENDERMODE_INVISIBLE));

    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(page, 0);
    ASSERT_TRUE(page_object);
    EXPECT_EQ(FPDF_TEXTRENDERMODE_FILL,
              FPDFTextObj_GetTextRenderMode(page_object));

    // Cannot set UNKNOWN as a render mode.
    EXPECT_FALSE(FPDFTextObj_SetTextRenderMode(page_object,
                                               FPDF_TEXTRENDERMODE_UNKNOWN));

    EXPECT_TRUE(
        FPDFTextObj_SetTextRenderMode(page_object, FPDF_TEXTRENDERMODE_STROKE));
    EXPECT_EQ(FPDF_TEXTRENDERMODE_STROKE,
              FPDFTextObj_GetTextRenderMode(page_object));

    // Check that bitmap displays changed content
    {
      ScopedFPDFBitmap page_bitmap = RenderPage(page);
      CompareBitmap(page_bitmap.get(), 612, 446, stroke_checksum);
    }

    // Save a copy.
    EXPECT_TRUE(FPDFPage_GenerateContent(page));
    EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));

    UnloadPage(page);
  }

  {
    // Open the saved copy and render it. Check that the changed text render
    // mode is kept in the saved copy.
    ASSERT_TRUE(OpenSavedDocument());
    FPDF_PAGE saved_page = LoadSavedPage(0);
    ASSERT_TRUE(saved_page);

    FPDF_PAGEOBJECT page_object = FPDFPage_GetObject(saved_page, 0);
    EXPECT_TRUE(page_object);
    EXPECT_EQ(FPDF_TEXTRENDERMODE_STROKE,
              FPDFTextObj_GetTextRenderMode(page_object));

    ScopedFPDFBitmap bitmap = RenderSavedPage(saved_page);
    CompareBitmap(bitmap.get(), 612, 446, stroke_checksum);

    CloseSavedPage(saved_page);
    CloseSavedDocument();
  }
}

TEST_F(FPDFEditEmbedderTest, TextFontProperties) {
  // bad object tests
  EXPECT_FALSE(FPDFTextObj_GetFont(nullptr));
  EXPECT_EQ(0U, FPDFFont_GetFontName(nullptr, nullptr, 5));
  EXPECT_EQ(-1, FPDFFont_GetFlags(nullptr));
  EXPECT_EQ(-1, FPDFFont_GetWeight(nullptr));
  EXPECT_FALSE(FPDFFont_GetItalicAngle(nullptr, nullptr));
  EXPECT_FALSE(FPDFFont_GetAscent(nullptr, 12.f, nullptr));
  EXPECT_FALSE(FPDFFont_GetDescent(nullptr, 12.f, nullptr));
  EXPECT_FALSE(FPDFFont_GetGlyphWidth(nullptr, 's', 12.f, nullptr));
  EXPECT_FALSE(FPDFFont_GetGlyphPath(nullptr, 's', 12.f));

  // good object tests
  ASSERT_TRUE(OpenDocument("text_font.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT text = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(text);
  float font_size;
  ASSERT_TRUE(FPDFTextObj_GetFontSize(text, &font_size));
  FPDF_FONT font = FPDFTextObj_GetFont(text);
  ASSERT_TRUE(font);

  // null return pointer tests
  EXPECT_FALSE(FPDFFont_GetItalicAngle(font, nullptr));
  EXPECT_FALSE(FPDFFont_GetAscent(font, font_size, nullptr));
  EXPECT_FALSE(FPDFFont_GetDescent(font, font_size, nullptr));
  EXPECT_FALSE(FPDFFont_GetGlyphWidth(font, 's', font_size, nullptr));

  // correct property tests
  {
    EXPECT_EQ(4, FPDFFont_GetFlags(font));
    EXPECT_EQ(400, FPDFFont_GetWeight(font));

    int angle;
    EXPECT_TRUE(FPDFFont_GetItalicAngle(font, &angle));
    EXPECT_EQ(0, angle);

    float ascent;
    EXPECT_TRUE(FPDFFont_GetAscent(font, font_size, &ascent));
    EXPECT_FLOAT_EQ(891 * font_size / 1000.0f, ascent);

    float descent;
    EXPECT_TRUE(FPDFFont_GetDescent(font, font_size, &descent));
    EXPECT_FLOAT_EQ(-216 * font_size / 1000.0f, descent);

    float a12;
    float a24;
    EXPECT_TRUE(FPDFFont_GetGlyphWidth(font, 'a', 12.0f, &a12));
    EXPECT_FLOAT_EQ(a12, 5.316f);
    EXPECT_TRUE(FPDFFont_GetGlyphWidth(font, 'a', 24.0f, &a24));
    EXPECT_FLOAT_EQ(a24, 10.632f);
  }

  {
    // FPDFFont_GetFontName() positive testing.
    unsigned long size = FPDFFont_GetFontName(font, nullptr, 0);
    const char kExpectedFontName[] = "Liberation Serif";
    ASSERT_EQ(sizeof(kExpectedFontName), size);
    std::vector<char> font_name(size);
    ASSERT_EQ(size, FPDFFont_GetFontName(font, font_name.data(), size));
    ASSERT_STREQ(kExpectedFontName, font_name.data());

    // FPDFFont_GetFontName() negative testing.
    ASSERT_EQ(0U, FPDFFont_GetFontName(nullptr, nullptr, 0));

    font_name.resize(2);
    font_name[0] = 'x';
    font_name[1] = '\0';
    size = FPDFFont_GetFontName(font, font_name.data(), font_name.size());
    ASSERT_EQ(sizeof(kExpectedFontName), size);
    ASSERT_STREQ("x", font_name.data());
  }

  {
    // FPDFFont_GetFontData() positive testing.
    constexpr size_t kExpectedSize = 8268;
    std::vector<uint8_t> buf;
    size_t buf_bytes_required = 123;
    ASSERT_TRUE(FPDFFont_GetFontData(font, nullptr, 0, &buf_bytes_required));
    ASSERT_EQ(kExpectedSize, buf_bytes_required);

    buf.resize(kExpectedSize);
    EXPECT_EQ("495800b8e56e2d37f3bc48a1b52db952", GenerateMD5Base16(buf));
    buf_bytes_required = 234;
    // Test with buffer that is too small. Make sure `buf` is unchanged.
    EXPECT_TRUE(FPDFFont_GetFontData(font, buf.data(), buf.size() - 1,
                                     &buf_bytes_required));
    EXPECT_EQ("495800b8e56e2d37f3bc48a1b52db952", GenerateMD5Base16(buf));
    EXPECT_EQ(kExpectedSize, buf_bytes_required);

    // Test with buffer of the correct size.
    buf_bytes_required = 234;
    EXPECT_TRUE(FPDFFont_GetFontData(font, buf.data(), buf.size(),
                                     &buf_bytes_required));
    EXPECT_EQ("1a67be75f719b6c476804d85bb9e4844", GenerateMD5Base16(buf));
    EXPECT_EQ(kExpectedSize, buf_bytes_required);

    // FPDFFont_GetFontData() negative testing.
    EXPECT_FALSE(FPDFFont_GetFontData(nullptr, nullptr, 0, nullptr));
    EXPECT_FALSE(FPDFFont_GetFontData(font, nullptr, 0, nullptr));

    buf_bytes_required = 345;
    EXPECT_FALSE(
        FPDFFont_GetFontData(nullptr, nullptr, 0, &buf_bytes_required));
    EXPECT_EQ(345u, buf_bytes_required);

    EXPECT_FALSE(
        FPDFFont_GetFontData(nullptr, buf.data(), buf.size(), nullptr));
    EXPECT_FALSE(FPDFFont_GetFontData(font, buf.data(), buf.size(), nullptr));

    buf_bytes_required = 345;
    EXPECT_FALSE(FPDFFont_GetFontData(nullptr, buf.data(), buf.size(),
                                      &buf_bytes_required));
    EXPECT_EQ(345u, buf_bytes_required);
  }
  {
    ASSERT_EQ(1, FPDFFont_GetIsEmbedded(font));
    ASSERT_EQ(-1, FPDFFont_GetIsEmbedded(nullptr));
  }

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, NoEmbeddedFontData) {
  ASSERT_TRUE(OpenDocument("hello_world.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);
  ASSERT_EQ(2, FPDFPage_CountObjects(page));

  // Since hello_world.pdf does not embed any font data, FPDFFont_GetFontData()
  // will return the substitution font data. Since pdfium_embeddertest is
  // hermetic, this first object consistently maps to Tinos-Regular.ttf.
  constexpr size_t kTinosRegularSize = 469968;
  FPDF_PAGEOBJECT text = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(text);
  FPDF_FONT font = FPDFTextObj_GetFont(text);
  ASSERT_TRUE(font);
  std::vector<uint8_t> buf;
  buf.resize(kTinosRegularSize);
  size_t buf_bytes_required;
  ASSERT_TRUE(
      FPDFFont_GetFontData(font, buf.data(), buf.size(), &buf_bytes_required));
  EXPECT_EQ(kTinosRegularSize, buf_bytes_required);
  EXPECT_EQ("2b019558f2c2de0b7cbc0a6e64b20599", GenerateMD5Base16(buf));
  EXPECT_EQ(0, FPDFFont_GetIsEmbedded(font));

  // Similarly, the second object consistently maps to Arimo-Regular.ttf.
  constexpr size_t kArimoRegularSize = 436180;
  text = FPDFPage_GetObject(page, 1);
  ASSERT_TRUE(text);
  font = FPDFTextObj_GetFont(text);
  ASSERT_TRUE(font);
  buf.resize(kArimoRegularSize);
  ASSERT_TRUE(
      FPDFFont_GetFontData(font, buf.data(), buf.size(), &buf_bytes_required));
  EXPECT_EQ(kArimoRegularSize, buf_bytes_required);
  EXPECT_EQ("7ac02a544211773d9636e056e9da6c35", GenerateMD5Base16(buf));
  EXPECT_EQ(0, FPDFFont_GetIsEmbedded(font));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, GlyphPaths) {
  // bad glyphpath
  EXPECT_EQ(-1, FPDFGlyphPath_CountGlyphSegments(nullptr));
  EXPECT_FALSE(FPDFGlyphPath_GetGlyphPathSegment(nullptr, 1));

  ASSERT_TRUE(OpenDocument("text_font.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);
  ASSERT_EQ(1, FPDFPage_CountObjects(page));
  FPDF_PAGEOBJECT text = FPDFPage_GetObject(page, 0);
  ASSERT_TRUE(text);
  FPDF_FONT font = FPDFTextObj_GetFont(text);
  ASSERT_TRUE(font);

  // bad glyph argument.
  ASSERT_FALSE(FPDFFont_GetGlyphPath(font, 1, 12.0f));

  // good glyphpath
  FPDF_GLYPHPATH gpath = FPDFFont_GetGlyphPath(font, 's', 12.0f);
  ASSERT_TRUE(gpath);

  int count = FPDFGlyphPath_CountGlyphSegments(gpath);
  ASSERT_GT(count, 0);
  EXPECT_FALSE(FPDFGlyphPath_GetGlyphPathSegment(gpath, -1));
  EXPECT_FALSE(FPDFGlyphPath_GetGlyphPathSegment(gpath, count));

  FPDF_PATHSEGMENT segment = FPDFGlyphPath_GetGlyphPathSegment(gpath, 1);
  ASSERT_TRUE(segment);
  EXPECT_EQ(FPDF_SEGMENT_BEZIERTO, FPDFPathSegment_GetType(segment));

  UnloadPage(page);
}

TEST_F(FPDFEditEmbedderTest, FormGetObjects) {
  ASSERT_TRUE(OpenDocument("form_object.pdf"));
  FPDF_PAGE page = LoadPage(0);
  ASSERT_TRUE(page);
  ASSERT_EQ(1, FPDFPage_CountObjects(page));

  FPDF_PAGEOBJECT form = FPDFP