text: // 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.
  
  #ifndef BASE_ANDROID_ANDROID_IMAGE_READER_COMPAT_H_
  #define BASE_ANDROID_ANDROID_IMAGE_READER_COMPAT_H_
  
  #include "base/android/android_image_reader_abi.h"
  #include "base/base_export.h"
  #include "base/macros.h"
  #include "base/no_destructor.h"
  
  namespace base {
  namespace android {
  
  // This class provides runtime support for working with AImage, AImageReader and
  // ANativeWindow objects on Android O systems without requiring building for the
  // Android O NDK level. Don't call GetInstance() unless IsSupported() returns
  // true.
  class BASE_EXPORT AndroidImageReader {
   public:
    // Thread safe GetInstance.
    static AndroidImageReader& GetInstance();
  
    // Check if the image reader usage is supported. This function returns TRUE
    // if android version is >=OREO, image reader support is not disabled and all
    // the required functions are loaded.
    bool IsSupported();
  
    // Naming convention of all the below functions are chosen to exactly match
    // the function names in the NDK.
    void AImage_delete(AImage* image);
    void AImage_deleteAsync(AImage* image, int releaseFenceFd);
    media_status_t AImage_getHardwareBuffer(const AImage* image,
                                            AHardwareBuffer** buffer);
    media_status_t AImage_getWidth(const AImage* image, int32_t* width);
    media_status_t AImage_getHeight(const AImage* image, int32_t* height);
    media_status_t AImage_getCropRect(const AImage* image, AImageCropRect* rect);
    media_status_t AImageReader_newWithUsage(int32_t width,
                                             int32_t height,
                                             int32_t format,
                                             uint64_t usage,
                                             int32_t maxImages,
                                             AImageReader** reader);
    media_status_t AImageReader_setImageListener(
        AImageReader* reader,
        AImageReader_ImageListener* listener);
    void AImageReader_delete(AImageReader* reader);
    media_status_t AImageReader_getFormat(const AImageReader* reader,
                                          int32_t* format);
    media_status_t AImageReader_getWindow(AImageReader* reader,
                                          ANativeWindow** window);
    media_status_t AImageReader_acquireLatestImageAsync(AImageReader* reader,
                                                        AImage** image,
                                                        int* acquireFenceFd);
    media_status_t AImageReader_acquireNextImageAsync(AImageReader* reader,
                                                      AImage** image,
                                                      int* acquireFenceFd);
    jobject ANativeWindow_toSurface(JNIEnv* env, ANativeWindow* window);
  
   private:
    friend class base::NoDestructor<AndroidImageReader>;
  
    AndroidImageReader();
    bool LoadFunctions();
  
    const bool is_supported_;
    pAImage_delete AImage_delete_;
    pAImage_deleteAsync AImage_deleteAsync_;
    pAImage_getHardwareBuffer AImage_getHardwareBuffer_;
    pAImage_getWidth AImage_getWidth_;
    pAImage_getHeight AImage_getHeight_;
    pAImage_getCropRect AImage_getCropRect_;
    pAImageReader_newWithUsage AImageReader_newWithUsage_;
    pAImageReader_setImageListener AImageReader_setImageListener_;
    pAImageReader_delete AImageReader_delete_;
    pAImageReader_getFormat AImageReader_getFormat_;
    pAImageReader_getWindow AImageReader_getWindow_;
    pAImageReader_acquireLatestImageAsync AImageReader_acquireLatestImageAsync_;
    pAImageReader_acquireNextImageAsync AImageReader_acquireNextImageAsync_;
    pANativeWindow_toSurface ANativeWindow_toSurface_;
  
    DISALLOW_COPY_AND_ASSIGN(AndroidImageReader);
  };
  
  }  // namespace android
  }  // namespace base
  
  #endif  // BASE_ANDROID_ANDROID_IMAGE_READER_COMPAT_H_
  