// Copyright 2012 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 "cc/test/skia_common.h"

#include <stddef.h>
#include <string>

#include "base/strings/string_number_conversions.h"
#include "cc/paint/display_item_list.h"
#include "cc/paint/draw_image.h"
#include "cc/paint/paint_canvas.h"
#include "cc/paint/paint_image_builder.h"
#include "cc/paint/skottie_wrapper.h"
#include "cc/test/fake_paint_image_generator.h"
#include "third_party/skia/include/core/SkImageGenerator.h"
#include "third_party/skia/include/core/SkPixmap.h"
#include "third_party/skia/include/gpu/GrContext.h"
#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/skia_util.h"

namespace cc {
namespace {
constexpr char kSkottieJSON[] =
    "{"
    "  \"v\" : \"4.12.0\","
    "  \"fr\": 30,"
    "  \"w\" : $WIDTH,"
    "  \"h\" : $HEIGHT,"
    "  \"ip\": 0,"
    "  \"op\": $DURATION,"
    "  \"assets\": [],"

    "  \"layers\": ["
    "    {"
    "      \"ty\": 1,"
    "      \"sw\": $WIDTH,"
    "      \"sh\": $HEIGHT,"
    "      \"sc\": \"#00ff00\","
    "      \"ip\": 0,"
    "      \"op\": $DURATION"
    "    }"
    "  ]"
    "}";

constexpr char kSkottieWidthToken[] = "$WIDTH";
constexpr char kSkottieHeightToken[] = "$HEIGHT";
constexpr char kSkottieDurationToken[] = "$DURATION";
constexpr int kFps = 30;
}  // namespace

void DrawDisplayList(unsigned char* buffer,
                     const gfx::Rect& layer_rect,
                     scoped_refptr<const DisplayItemList> list) {
  SkImageInfo info =
      SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
  SkBitmap bitmap;
  bitmap.installPixels(info, buffer, info.minRowBytes());
  SkCanvas canvas(bitmap);
  canvas.clipRect(gfx::RectToSkRect(layer_rect));
  list->Raster(&canvas);
}

bool AreDisplayListDrawingResultsSame(const gfx::Rect& layer_rect,
                                      const DisplayItemList* list_a,
                                      const DisplayItemList* list_b) {
  const size_t pixel_size = 4 * layer_rect.size().GetArea();

  std::unique_ptr<unsigned char[]> pixels_a(new unsigned char[pixel_size]);
  std::unique_ptr<unsigned char[]> pixels_b(new unsigned char[pixel_size]);
  memset(pixels_a.get(), 0, pixel_size);
  memset(pixels_b.get(), 0, pixel_size);
  DrawDisplayList(pixels_a.get(), layer_rect, list_a);
  DrawDisplayList(pixels_b.get(), layer_rect, list_b);

  return !memcmp(pixels_a.get(), pixels_b.get(), pixel_size);
}

Region ImageRectsToRegion(const DiscardableImageMap::Rects& rects) {
  Region region;
  for (const auto& r : rects.container())
    region.Union(r);
  return region;
}

sk_sp<PaintImageGenerator> CreatePaintImageGenerator(const gfx::Size& size) {
  return sk_make_sp<FakePaintImageGenerator>(
      SkImageInfo::MakeN32Premul(size.width(), size.height()));
}

PaintImage CreatePaintWorkletPaintImage(
    scoped_refptr<PaintWorkletInput> input) {
  auto paint_image = PaintImageBuilder::WithDefault()
                         .set_id(1)
                         .set_paint_worklet_input(std::move(input))
                         .TakePaintImage();
  return paint_image;
}

SkYUVASizeInfo GetYUV420SizeInfo(const gfx::Size& image_size, bool has_alpha) {
  const SkISize uv_size = SkISize::Make((image_size.width() + 1) / 2,
                                        (image_size.height() + 1) / 2);
  const size_t uv_width = base::checked_cast<size_t>(uv_size.width());
  SkYUVASizeInfo yuva_size_info;
  yuva_size_info.fSizes[SkYUVAIndex::kY_Index].set(image_size.width(),
                                                   image_size.height());
  yuva_size_info.fWidthBytes[SkYUVAIndex::kY_Index] =
      base::checked_cast<size_t>(image_size.width());
  yuva_size_info.fSizes[SkYUVAIndex::kU_Index] = uv_size;
  yuva_size_info.fWidthBytes[SkYUVAIndex::kU_Index] = uv_width;
  yuva_size_info.fSizes[SkYUVAIndex::kV_Index] = uv_size;
  yuva_size_info.fWidthBytes[SkYUVAIndex::kV_Index] = uv_width;
  if (has_alpha) {
    yuva_size_info.fSizes[SkYUVAIndex::kA_Index].set(image_size.width(),
                                                     image_size.height());
    yuva_size_info.fWidthBytes[SkYUVAIndex::kA_Index] =
        base::checked_cast<size_t>(image_size.width());
  } else {
    yuva_size_info.fSizes[SkYUVAIndex::kA_Index] = SkISize::MakeEmpty();
    yuva_size_info.fWidthBytes[SkYUVAIndex::kA_Index] = 0u;
  }
  return yuva_size_info;
}

PaintImage CreateDiscardablePaintImage(const gfx::Size& size,
                                       sk_sp<SkColorSpace> color_space,
                                       bool allocate_encoded_data,
                                       PaintImage::Id id,
                                       SkColorType color_type,
                                       bool is_yuv) {
  if (!color_space)
    color_space = SkColorSpace::MakeSRGB();
  if (id == PaintImage::kInvalidId)
    id = PaintImage::GetNextId();

  SkImageInfo info = SkImageInfo::Make(size.width(), size.height(), color_type,
                                       kPremul_SkAlphaType, color_space);
  sk_sp<PaintImageGenerator> generator;
  if (is_yuv) {
    // TODO(crbug.com/915972): Remove assumption of YUV420 in tests once we
    // support other subsamplings.
    generator = sk_make_sp<FakePaintImageGenerator>(
        info, GetYUV420SizeInfo(size),
        std::vector<FrameMetadata>{FrameMetadata()}, allocate_encoded_data);
  } else {
    generator = sk_make_sp<FakePaintImageGenerator>(
        info, std::vector<FrameMetadata>{FrameMetadata()},
        allocate_encoded_data);
  }
  auto paint_image =
      PaintImageBuilder::WithDefault()
          .set_id(id)
          .set_paint_image_generator(generator)
          // For simplicity, assume that any paint image created for testing is
          // unspecified decode mode as would be the case with most img tags on
          // the web.
          .set_decoding_mode(PaintImage::DecodingMode::kUnspecified)
          .TakePaintImage();
  return paint_image;
}

DrawImage CreateDiscardableDrawImage(const gfx::Size& size,
                                     sk_sp<SkColorSpace> color_space,
                                     SkRect rect,
                                     SkFilterQuality filter_quality,
                                     const SkMatrix& matrix) {
  SkIRect irect;
  rect.roundOut(&irect);

  return DrawImage(CreateDiscardablePaintImage(size, color_space), irect,
                   filter_quality, matrix);
}

PaintImage CreateAnimatedImage(const gfx::Size& size,
                               std::vector<FrameMetadata> frames,
                               int repetition_count,
                               PaintImage::Id id) {
  return PaintImageBuilder::WithDefault()
      .set_id(id)
      .set_paint_image_generator(sk_make_sp<FakePaintImageGenerator>(
          SkImageInfo::MakeN32Premul(size.width(), size.height()),
          std::move(frames)))
      .set_animation_type(PaintImage::AnimationType::ANIMATED)
      .set_repetition_count(repetition_count)
      .TakePaintImage();
}

PaintImage CreateBitmapImage(const gfx::Size& size, SkColorType color_type) {
  SkBitmap bitmap;
  auto info = SkImageInfo::Make(size.width(), size.height(), color_type,
                                kPremul_SkAlphaType, nullptr /* color_space */);
  bitmap.allocPixels(info);
  bitmap.eraseColor(SK_AlphaTRANSPARENT);
  return PaintImageBuilder::WithDefault()
      .set_id(PaintImage::GetNextId())
      .set_image(SkImage::MakeFromBitmap(bitmap),
                 PaintImage::GetNextContentId())
      .TakePaintImage();
}

scoped_refptr<SkottieWrapper> CreateSkottie(const gfx::Size& size,
                                            int duration_secs) {
  std::string json(kSkottieJSON);

  for (size_t pos = json.find(kSkottieWidthToken); pos != std::string::npos;
       pos = json.find(kSkottieWidthToken)) {
    json.replace(pos, strlen(kSkottieWidthToken),
                 base::NumberToString(size.width()));
  }

  for (size_t pos = json.find(kSkottieHeightToken); pos != std::string::npos;
       pos = json.find(kSkottieHeightToken)) {
    json.replace(pos, strlen(kSkottieHeightToken),
                 base::NumberToString(size.height()));
  }

  for (size_t pos = json.find(kSkottieDurationToken); pos != std::string::npos;
       pos = json.find(kSkottieDurationToken)) {
    json.replace(pos, strlen(kSkottieDurationToken),
                 base::NumberToString(duration_secs * kFps));
  }

  return base::MakeRefCounted<SkottieWrapper>(
      std::make_unique<SkMemoryStream>(json.c_str(), json.size()));
}

PaintImage CreateNonDiscardablePaintImage(const gfx::Size& size) {
  sk_sp<const GrGLInterface> gl_interface(GrGLCreateNullInterface());
  auto context = GrContext::MakeGL(std::move(gl_interface));
  SkBitmap bitmap;
  auto info = SkImageInfo::Make(size.width(), size.height(), kN32_SkColorType,
                                kPremul_SkAlphaType, nullptr /* color_space */);
  bitmap.allocPixels(info);
  bitmap.eraseColor(SK_AlphaTRANSPARENT);
  return PaintImageBuilder::WithDefault()
      .set_id(PaintImage::GetNextId())
      .set_image(SkImage::MakeFromBitmap(bitmap)->makeTextureImage(
                     context.get(), nullptr),
                 PaintImage::GetNextContentId())
      .TakePaintImage();
}

}  // namespace cc