hunk.code_window: import Video from '~/components/plugins/Video';
   import { BoxLink } from '~/ui/components/BoxLink';
   Building your project with Expo allows you to make most changes in JavaScript. This helps iterate quickly and safely and allows your team to [achieve web-like iteration speeds](https://blog.expo.dev/javascript-driven-development-with-custom-runtimes-eda87d574c9d) by dividing your application into:
   - **A native runtime**: A native binary that is built with Xcode or Android Studio. Expo Go is an example of a native runtime for iterating on React Native projects.
   - **An update**: A bundle of your application's JavaScript code and assets (images, video, fonts, and so on). An update can be served from your local computer with Expo CLI, embedded in the binary by EAS Build, or hosted on a publicly available server.
   When your project requires custom native code, a config plugin, a custom runtime version, or a reduced bundle size of the app, you can transition from using [Expo Go](https://expo.dev/client) to develop to a development build.
  
hunk.labels: keep keep keep keep keep replace keep keep keep
hunk.after_edit: - **A native runtime**: A native binary that is built with Android Studio or Xcode. Expo Go is an example of a native runtime for iterating on React Native projects.
  
hunk.file_path: docs/pages/develop/development-builds/introduction.mdx
hunk.type: replace
file: /*
   * Copyright 2020 Google LLC
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef SkYUVAPixmaps_DEFINED
  #define SkYUVAPixmaps_DEFINED
  
  #include "include/core/SkData.h"
  #include "include/core/SkImageInfo.h"
  #include "include/core/SkPixmap.h"
  #include "include/core/SkYUVAInfo.h"
  #include "include/private/SkTo.h"
  
  #include <array>
  #include <bitset>
  
  class GrImageContext;
  
  /**
   * SkYUVAInfo combined with per-plane SkColorTypes and row bytes. Fully specifies the SkPixmaps
   * for a YUVA image without the actual pixel memory and data.
   */
  class SK_API SkYUVAPixmapInfo {
  public:
      static constexpr auto kMaxPlanes = SkYUVAInfo::kMaxPlanes;
  
      using PlaneConfig  = SkYUVAInfo::PlaneConfig;
      using Subsampling  = SkYUVAInfo::Subsampling;
  
      /**
       * Data type for Y, U, V, and possibly A channels independent of how values are packed into
       * planes.
       **/
      enum class DataType {
          kUnorm8,          ///< 8 bit unsigned normalized
          kUnorm16,         ///< 16 bit unsigned normalized
          kFloat16,         ///< 16 bit (half) floating point
          kUnorm10_Unorm2,  ///< 10 bit unorm for Y, U, and V. 2 bit unorm for alpha (if present).
  
          kLast = kUnorm10_Unorm2
      };
      static constexpr int kDataTypeCnt = static_cast<int>(DataType::kLast) + 1;
  
      class SK_API SupportedDataTypes {
      public:
          /** Defaults to nothing supported. */
          constexpr SupportedDataTypes() = default;
  
          /** Init based on texture formats supported by the context. */
          SupportedDataTypes(const GrImageContext&);
  
          /** All legal combinations of PlaneConfig and DataType are supported. */
          static constexpr SupportedDataTypes All();
  
          /**
           * Checks whether there is a supported combination of color types for planes structured
           * as indicated by PlaneConfig with channel data types as indicated by DataType.
           */
          constexpr bool supported(PlaneConfig, DataType) const;
  
          /**
           * Update to add support for pixmaps with numChannel channels where each channel is
           * represented as DataType.
           */
          void enableDataType(DataType, int numChannels);
  
      private:
          // The bit for DataType dt with n channels is at index kDataTypeCnt*(n-1) + dt.
          std::bitset<kDataTypeCnt*4> fDataTypeSupport = {};
      };
  
      /**
       * Gets the default SkColorType to use with numChannels channels, each represented as DataType.
       * Returns kUnknown_SkColorType if no such color type.
       */
      static constexpr SkColorType DefaultColorTypeForDataType(DataType dataType, int numChannels);
  
      /**
       * If the SkColorType is supported for YUVA pixmaps this will return the number of YUVA channels
       * that can be stored in a plane of this color type and what the DataType is of those channels.
       * If the SkColorType is not supported as a YUVA plane the number of channels is reported as 0
       * and the DataType returned should be ignored.
       */
      static std::tuple<int, DataType> NumChannelsAndDataType(SkColorType);
  
      /** Default SkYUVAPixmapInfo is invalid. */
      SkYUVAPixmapInfo() = default;
  
      /**
       * Initializes the SkYUVAPixmapInfo from a SkYUVAInfo with per-plane color types and row bytes.
       * This will be invalid if the colorTypes aren't compatible with the SkYUVAInfo or if a
       * rowBytes entry is not valid for the plane dimensions and color type. Color type and
       * row byte values beyond the number of planes in SkYUVAInfo are ignored. All SkColorTypes
       * must have the same DataType or this will be invalid.
       *
       * If rowBytes is nullptr then bpp*width is assumed for each plane.
       */
      SkYUVAPixmapInfo(const SkYUVAInfo&,
                       const SkColorType[kMaxPlanes],
                       const size_t rowBytes[kMaxPlanes]);
      /**
       * Like above but uses DefaultColorTypeForDataType to determine each plane's SkColorType. If
       * rowBytes is nullptr then bpp*width is assumed for each plane.
       */
      SkYUVAPixmapInfo(const SkYUVAInfo&, DataType, const size_t rowBytes[kMaxPlanes]);
  
      SkYUVAPixmapInfo(const SkYUVAPixmapInfo&) = default;
  
      SkYUVAPixmapInfo& operator=(const SkYUVAPixmapInfo&) = default;
  
      bool operator==(const SkYUVAPixmapInfo&) const;
      bool operator!=(const SkYUVAPixmapInfo& that) const { return !(*this == that); }
  
      const SkYUVAInfo& yuvaInfo() const { return fYUVAInfo; }
  
      SkYUVColorSpace yuvColorSpace() const { return fYUVAInfo.yuvColorSpace(); }
  
      /** The number of SkPixmap planes, 0 if this SkYUVAPixmapInfo is invalid. */
      int numPlanes() const { return fYUVAInfo.numPlanes(); }
  
      /** The per-YUV[A] channel data type. */
      DataType dataType() const { return fDataType; }
  
      /**
       * Row bytes for the ith plane. Returns zero if i >= numPlanes() or this SkYUVAPixmapInfo is
       * invalid.
       */
      size_t rowBytes(int i) const { return fRowBytes[static_cast<size_t>(i)]; }
  
      /** Image info for the ith plane, or default SkImageInfo if i >= numPlanes() */
      const SkImageInfo& planeInfo(int i) const { return fPlaneInfos[static_cast<size_t>(i)]; }
  
      /**
       * Determine size to allocate for all planes. Optionally retrieves the per-plane sizes in
       * planeSizes if not null. If total size overflows will return SIZE_MAX and set all planeSizes
       * to SIZE_MAX. Returns 0 and fills planesSizes with 0 if this SkYUVAPixmapInfo is not valid.
       */
      size_t computeTotalBytes(size_t planeSizes[kMaxPlanes] = nullptr) const;
  
      /**
       * Takes an allocation that is assumed to be at least computeTotalBytes() in size and configures
       * the first numPlanes() entries in pixmaps array to point into that memory. The remaining
       * entries of pixmaps are default initialized. Fails if this SkYUVAPixmapInfo not valid.
       */
      bool initPixmapsFromSingleAllocation(void* memory, SkPixmap pixmaps[kMaxPlanes]) const;
  
      /**
       * Returns true if this has been configured with a non-empty dimensioned SkYUVAInfo with
       * compatible color types and row bytes.
       */
      bool isValid() const { return fYUVAInfo.isValid(); }
  
      /** Is this valid and does it use color types allowed by the passed SupportedDataTypes? */
      bool isSupported(const SupportedDataTypes&) const;
  
  private:
      SkYUVAInfo fYUVAInfo;
      std::array<SkImageInfo, kMaxPlanes> fPlaneInfos = {};
      std::array<size_t, kMaxPlanes> fRowBytes = {};
      DataType fDataType = DataType::kUnorm8;
      static_assert(kUnknown_SkColorType == 0, "default init isn't kUnknown");
  };
  
  /**
   * Helper to store SkPixmap planes as described by a SkYUVAPixmapInfo. Can be responsible for
   * allocating/freeing memory for pixmaps or use external memory.
   */
  class SK_API SkYUVAPixmaps {
  public:
      using DataType = SkYUVAPixmapInfo::DataType;
      static constexpr auto kMaxPlanes = SkYUVAPixmapInfo::kMaxPlanes;
  
      static SkColorType RecommendedRGBAColorType(DataType);
  
      /** Allocate space for pixmaps' pixels in the SkYUVAPixmaps. */
      static SkYUVAPixmaps Allocate(const SkYUVAPixmapInfo& yuvaPixmapInfo);
  
      /**
       * Use storage in SkData as backing store for pixmaps' pixels. SkData is retained by the
       * SkYUVAPixmaps.
       */
      static SkYUVAPixmaps FromData(const SkYUVAPixmapInfo&, sk_sp<SkData>);
  
      /**
       * Makes a deep copy of the src SkYUVAPixmaps. The returned SkYUVAPixmaps owns its planes'
       * backing stores.
       */
      static SkYUVAPixmaps MakeCopy(const SkYUVAPixmaps& src);
  
      /**
       * Use passed in memory as backing store for pixmaps' pixels. Caller must ensure memory remains
       * allocated while pixmaps are in use. There must be at least
       * SkYUVAPixmapInfo::computeTotalBytes() allocated starting at memory.
       */
      static SkYUVAPixmaps FromExternalMemory(const SkYUVAPixmapInfo&, void* memory);
  
      /**
       * Wraps existing SkPixmaps. The SkYUVAPixmaps will have no ownership of the SkPixmaps' pixel
       * memory so the caller must ensure it remains valid. Will return an invalid SkYUVAPixmaps if
       * the SkYUVAInfo isn't compatible with the SkPixmap array (number of planes, plane dimensions,
       * sufficient color channels in planes, ...).
       */
      static SkYUVAPixmaps FromExternalPixmaps(const SkYUVAInfo&, const SkPixmap[kMaxPlanes]);
  
      /** Default SkYUVAPixmaps is invalid. */
      SkYUVAPixmaps() = default;
      ~SkYUVAPixmaps() = default;
  
      SkYUVAPixmaps(SkYUVAPixmaps&& that) = default;
      SkYUVAPixmaps& operator=(SkYUVAPixmaps&& that) = default;
      SkYUVAPixmaps(const SkYUVAPixmaps&) = default;
      SkYUVAPixmaps& operator=(const SkYUVAPixmaps& that) = default;
  
      /** Does have initialized pixmaps compatible with its SkYUVAInfo. */
      bool isValid() const { return !fYUVAInfo.dimensions().isEmpty(); }
  
      const SkYUVAInfo& yuvaInfo() const { return fYUVAInfo; }
  
      DataType dataType() const { return fDataType; }
  
      SkYUVAPixmapInfo pixmapsInfo() const;
  
      /** Number of pixmap planes or 0 if this SkYUVAPixmaps is invalid. */
      int numPlanes() const { return this->isValid() ? fYUVAInfo.numPlanes() : 0; }
  
      /**
       * Access the SkPixmap planes. They are default initialized if this is not a valid
       * SkYUVAPixmaps.
       */
      const std::array<SkPixmap, kMaxPlanes>& planes() const { return fPlanes; }
  
      /**
       * Get the ith SkPixmap plane. SkPixmap will be default initialized if i >= numPlanes or this
       * SkYUVAPixmaps is invalid.
       */
      const SkPixmap& plane(int i) const { return fPlanes[SkToSizeT(i)]; }
  
      /**
       * Computes a YUVALocations representation of the planar layout. The result is guaranteed to be
       * valid if this->isValid().
       */
      SkYUVAInfo::YUVALocations toYUVALocations() const;
  
      /** Does this SkPixmaps own the backing store of the planes? */
      bool ownsStorage() const { return SkToBool(fData); }
  
  private:
      SkYUVAPixmaps(const SkYUVAPixmapInfo&, sk_sp<SkData>);
      SkYUVAPixmaps(const SkYUVAInfo&, DataType, const SkPixmap[kMaxPlanes]);
  
      std::array<SkPixmap, kMaxPlanes> fPlanes = {};
      sk_sp<SkData> fData;
      SkYUVAInfo fYUVAInfo;
      DataType fDataType;
  };
  
  //////////////////////////////////////////////////////////////////////////////
  
  constexpr SkYUVAPixmapInfo::SupportedDataTypes SkYUVAPixmapInfo::SupportedDataTypes::All() {
      using ULL = unsigned long long; // bitset cons. takes this.
      ULL bits = 0;
      for (ULL c = 1; c <= 4; ++c) {
          for (ULL dt = 0; dt <= ULL(kDataTypeCnt); ++dt) {
              if (DefaultColorTypeForDataType(static_cast<DataType>(dt),
                                              static_cast<int>(c)) != kUnknown_SkColorType) {
                  bits |= ULL(1) << (dt + static_cast<ULL>(kDataTypeCnt)*(c - 1));
              }
          }
      }
      SupportedDataTypes combinations;
      combinations.fDataTypeSupport = bits;
      return combinations;
  }
  
  constexpr bool SkYUVAPixmapInfo::SupportedDataTypes::supported(PlaneConfig config,
                                                                 DataType type) const {
      int n = SkYUVAInfo::NumPlanes(config);
      for (int i = 0; i < n; ++i) {
          auto c = static_cast<size_t>(SkYUVAInfo::NumChannelsInPlane(config, i));
          SkASSERT(c >= 1 && c <= 4);
          if (!fDataTypeSupport[static_cast<size_t>(type) +
                                (c - 1)*static_cast<size_t>(kDataTypeCnt)]) {
              return false;
          }
      }
      return true;
  }
  
  constexpr SkColorType SkYUVAPixmapInfo::DefaultColorTypeForDataType(DataType dataType,
                                                                      int numChannels) {
      switch (numChannels) {
          case 1:
              switch (dataType) {
                  case DataType::kUnorm8:         return kGray_8_SkColorType;
                  case DataType::kUnorm16:        return kA16_unorm_SkColorType;
                  case DataType::kFloat16:        return kA16_float_SkColorType;
                  case DataType::kUnorm10_Unorm2: return kUnknown_SkColorType;
              }
              break;
          case 2:
              switch (dataType) {
                  case DataType::kUnorm8:         return kR8G8_unorm_SkColorType;
                  case DataType::kUnorm16:        return kR16G16_unorm_SkColorType;
                  case DataType::kFloat16:        return kR16G16_float_SkColorType;
                  case DataType::kUnorm10_Unorm2: return kUnknown_SkColorType;
              }
              break;
          case 3:
              // None of these are tightly packed. The intended use case is for interleaved YUVA
              // planes where we're forcing opaqueness by ignoring the alpha values.
              // There are "x" rather than "A" variants for Unorm8 and Unorm10_Unorm2 but we don't
              // choose them because 1) there is no inherent advantage and 2) there is better support
              // in the GPU backend for the "A" versions.
              switch (dataType) {
                  case DataType::kUnorm8:         return kRGBA_8888_SkColorType;
                  case DataType::kUnorm16:        return kR16G16B16A16_unorm_SkColorType;
                  case DataType::kFloat16:        return kRGBA_F16_SkColorType;
                  case DataType::kUnorm10_Unorm2: return kRGBA_1010102_SkColorType;
              }
              break;
          case 4:
              switch (dataType) {
                  case DataType::kUnorm8:         return kRGBA_8888_SkColorType;
                  case DataType::kUnorm16:        return kR16G16B16A16_unorm_SkColorType;
                  case DataType::kFloat16:        return kRGBA_F16_SkColorType;
                  case DataType::kUnorm10_Unorm2: return kRGBA_1010102_SkColorType;
              }
              break;
      }
      return kUnknown_SkColorType;
  }
  
  #endif
  