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

#include "printing/metafile_skia.h"

#include <utility>

#include "build/build_config.h"
#include "cc/paint/paint_record.h"
#include "printing/common/metafile_utils.h"
#include "printing/mojom/print.mojom.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkSerialProcs.h"
#include "third_party/skia/include/core/SkSize.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkSurfaceProps.h"
#include "third_party/skia/include/core/SkTextBlob.h"

namespace printing {

TEST(MetafileSkiaTest, TestFrameContent) {
  constexpr int kPictureSideLen = 100;
  constexpr int kPageSideLen = 150;

  // Create a placeholder picture.
  sk_sp<SkPicture> pic_holder = SkPicture::MakePlaceholder(
      SkRect::MakeXYWH(0, 0, kPictureSideLen, kPictureSideLen));

  // Create the page with nested content which is the placeholder and will be
  // replaced later.
  sk_sp<cc::PaintRecord> record = sk_make_sp<cc::PaintRecord>();
  cc::PaintFlags flags;
  flags.setColor(SK_ColorWHITE);
  const SkRect page_rect = SkRect::MakeXYWH(0, 0, kPageSideLen, kPageSideLen);
  record->push<cc::DrawRectOp>(page_rect, flags);
  const uint32_t content_id = pic_holder->uniqueID();
  record->push<cc::CustomDataOp>(content_id);
  SkSize page_size = SkSize::Make(kPageSideLen, kPageSideLen);

  // Finish creating the entire metafile.
  MetafileSkia metafile(mojom::SkiaDocumentType::kMSKP, 1);
  metafile.AppendPage(page_size, std::move(record));
  metafile.AppendSubframeInfo(content_id, base::UnguessableToken::Create(),
                              std::move(pic_holder));
  metafile.FinishFrameContent();
  SkStreamAsset* metafile_stream = metafile.GetPdfData();
  ASSERT_TRUE(metafile_stream);

  // Draw a 100 by 100 red square which will be the actual content of
  // the placeholder.
  SkPictureRecorder recorder;
  SkCanvas* canvas = recorder.beginRecording(kPictureSideLen, kPictureSideLen);
  SkPaint paint;
  paint.setStyle(SkPaint::kFill_Style);
  paint.setColor(SK_ColorRED);
  paint.setAlpha(SK_AlphaOPAQUE);
  canvas->drawRect(SkRect::MakeXYWH(0, 0, kPictureSideLen, kPictureSideLen),
                   paint);
  sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
  EXPECT_TRUE(picture);

  // Get the complete picture by replacing the placeholder.
  PictureDeserializationContext subframes;
  subframes[content_id] = picture;
  SkDeserialProcs procs = DeserializationProcs(&subframes, nullptr);
  sk_sp<SkPicture> pic = SkPicture::MakeFromStream(metafile_stream, &procs);
  ASSERT_TRUE(pic);

  // Verify the resultant picture is as expected by comparing the sizes and
  // detecting the color inside and outside of the square area.
  EXPECT_TRUE(pic->cullRect() == page_rect);
  SkBitmap bitmap;
  bitmap.allocN32Pixels(kPageSideLen, kPageSideLen);
  SkCanvas bitmap_canvas(bitmap, SkSurfaceProps{});
  pic->playback(&bitmap_canvas);
  // Check top left pixel color of the red square.
  EXPECT_EQ(bitmap.getColor(0, 0), SK_ColorRED);
  // Check bottom right pixel of the red square.
  EXPECT_EQ(bitmap.getColor(kPictureSideLen - 1, kPictureSideLen - 1),
            SK_ColorRED);
  // Check inside of the red square.
  EXPECT_EQ(bitmap.getColor(kPictureSideLen / 2, kPictureSideLen / 2),
            SK_ColorRED);
  // Check outside of the red square.
  EXPECT_EQ(bitmap.getColor(kPictureSideLen, kPictureSideLen), SK_ColorWHITE);
}

TEST(MetafileSkiaTest, TestMultiPictureDocumentTypefaces) {
  constexpr int kPictureSideLen = 100;
  constexpr int kPageSideLen = 150;
  constexpr int kDocumentCookie = 1;
  constexpr int kNumDocumentPages = 2;

  // The content tracking for serialization/deserialization.
  ContentProxySet serialize_typeface_ctx;
  PictureDeserializationContext subframes;
  TypefaceDeserializationContext typefaces;
  SkDeserialProcs procs = DeserializationProcs(&subframes, &typefaces);

  // The typefaces which will be reused across the multiple (duplicate) pages.
  constexpr char kTypefaceName1[] = "sans-serif";
#if BUILDFLAG(IS_WIN)
  constexpr char kTypefaceName2[] = "Courier New";
#else
  constexpr char kTypefaceName2[] = "monospace";
#endif
  constexpr size_t kNumTypefaces = 2;
  sk_sp<SkTypeface> typeface1 =
      SkTypeface::MakeFromName(kTypefaceName1, SkFontStyle());
  sk_sp<SkTypeface> typeface2 =
      SkTypeface::MakeFromName(kTypefaceName2, SkFontStyle());
  const SkFont font1 = SkFont(typeface1, 10);
  const SkFont font2 = SkFont(typeface2, 12);

  // Node IDs for the text, which will increase for each text blob added.
  cc::NodeId node_id = 7;

  // All text can just be black.
  cc::PaintFlags flags_text;
  flags_text.setColor(SK_ColorBLACK);

  // Mark the text on white pages, each of the same size.
  cc::PaintFlags flags;
  flags.setColor(SK_ColorWHITE);
  const SkRect page_rect = SkRect::MakeXYWH(0, 0, kPageSideLen, kPageSideLen);
  SkSize page_size = SkSize::Make(kPageSideLen, kPageSideLen);

  for (int i = 0; i < kNumDocumentPages; i++) {
    MetafileSkia metafile(mojom::SkiaDocumentType::kMSKP, kDocumentCookie);

    // When the stream is serialized inside FinishFrameContent(), any typeface
    // which is used on any page will be serialized only once by the first
    // page's metafile which needed it.  Any subsequent page that reuses the
    // same typeface will rely upon `serialize_typeface_ctx` which is used by
    // printing::SerializeOopTypeface() to optimize away the need to resend.
    metafile.UtilizeTypefaceContext(&serialize_typeface_ctx);

    sk_sp<SkPicture> pic_holder = SkPicture::MakePlaceholder(
        SkRect::MakeXYWH(0, 0, kPictureSideLen, kPictureSideLen));

    // Create the page for the text content.
    sk_sp<cc::PaintRecord> record = sk_make_sp<cc::PaintRecord>();
    record->push<cc::DrawRectOp>(page_rect, flags);
    const uint32_t content_id = pic_holder->uniqueID();
    record->push<cc::CustomDataOp>(content_id);

    // Mark the page with some text using multiple fonts.
    // Use the first font.
    sk_sp<SkTextBlob> text_blob1 = SkTextBlob::MakeFromString("foo", font1);
    record->push<cc::DrawTextBlobOp>(text_blob1, 0.0f, 0.0f, ++node_id,
                                     flags_text);

    // Use the second font.
    sk_sp<SkTextBlob> text_blob2 = SkTextBlob::MakeFromString("bar", font2);
    record->push<cc::DrawTextBlobOp>(text_blob2, 0.0f, 0.0f, ++node_id,
                                     flags_text);

    // Reuse the first font again on same page.
    sk_sp<SkTextBlob> text_blob3 = SkTextBlob::MakeFromString("bar", font2);
    record->push<cc::DrawTextBlobOp>(text_blob3, 0.0f, 0.0f, ++node_id,
                                     flags_text);

    metafile.AppendPage(page_size, std::move(record));
    metafile.AppendSubframeInfo(content_id, base::UnguessableToken::Create(),
                                std::move(pic_holder));
    metafile.FinishFrameContent();
    SkStreamAsset* metafile_stream = metafile.GetPdfData();
    ASSERT_TRUE(metafile_stream);

    // Deserialize the stream.  Any given typeface is expected to appear only
    // once in the stream, so the deserialization context of `typefaces` bundled
    // with `procs` should be empty the first time through, and afterwards
    // there should never be more than the number of unique typefaces we used,
    // regardless of number of pages.
    EXPECT_EQ(typefaces.size(), i ? kNumTypefaces : 0);
    ASSERT_TRUE(SkPicture::MakeFromStream(metafile_stream, &procs));
    EXPECT_EQ(typefaces.size(), kNumTypefaces);
  }
}

}  // namespace printing