image_external_texture_gl.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_ANDROID_IMAGE_EXTERNAL_TEXTURE_GL_H_
#define FLUTTER_SHELL_PLATFORM_ANDROID_IMAGE_EXTERNAL_TEXTURE_GL_H_
 
#include <unordered_map>
 
#include "flutter/fml/platform/android/scoped_java_ref.h"
#include "flutter/shell/platform/android/image_external_texture.h"
 
#include "flutter/impeller/renderer/backend/gles/context_gles.h"
#include "flutter/impeller/renderer/backend/gles/gles.h"
#include "flutter/impeller/renderer/backend/gles/texture_gles.h"
#include "flutter/impeller/toolkit/egl/egl.h"
#include "flutter/impeller/toolkit/egl/image.h"
#include "flutter/impeller/toolkit/gles/texture.h"
#include "flutter/shell/platform/android/android_context_gl_skia.h"
 
namespace flutter {
 
class ImageExternalTextureGL : public ImageExternalTexture {
 public:
  ImageExternalTextureGL(
      int64_t id,
      const fml::jni::ScopedJavaGlobalRef<jobject>& image_textury_entry,
      const std::shared_ptr<PlatformViewAndroidJNI>& jni_facade);
 
 protected:
  void Attach(PaintContext& context) override;
  void Detach() override;
  void ProcessFrame(PaintContext& context, const SkRect& bounds) override;
  void UpdateImage(JavaLocalRef& hardware_buffer,
                   const SkRect& bounds,
                   PaintContext& context);
 
  virtual sk_sp<flutter::DlImage> CreateDlImage(
      PaintContext& context,
      const SkRect& bounds,
      std::optional<HardwareBufferKey> id,
      impeller::UniqueEGLImageKHR&& egl_image) = 0;
 
  impeller::UniqueEGLImageKHR CreateEGLImage(AHardwareBuffer* buffer);
 
  struct GlEntry {
    impeller::UniqueEGLImageKHR egl_image;
    impeller::UniqueGLTexture texture;
  };
 
  // Each GL entry is keyed off of the currently active
  // hardware buffers and evicted when the hardware buffer
  // is removed from the LRU cache.
  std::unordered_map<HardwareBufferKey, GlEntry> gl_entries_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(ImageExternalTextureGL);
};
 
class ImageExternalTextureGLSkia : public ImageExternalTextureGL {
 public:
  ImageExternalTextureGLSkia(
      const std::shared_ptr<AndroidContextGLSkia>& context,
      int64_t id,
      const fml::jni::ScopedJavaGlobalRef<jobject>& image_textury_entry,
      const std::shared_ptr<PlatformViewAndroidJNI>& jni_facade);
 
 private:
  void Attach(PaintContext& context) override;
  void Detach() override;
 
  void BindImageToTexture(const impeller::UniqueEGLImageKHR& image, GLuint tex);
 
  sk_sp<flutter::DlImage> CreateDlImage(
      PaintContext& context,
      const SkRect& bounds,
      std::optional<HardwareBufferKey> id,
      impeller::UniqueEGLImageKHR&& egl_image) override;
 
  FML_DISALLOW_COPY_AND_ASSIGN(ImageExternalTextureGLSkia);
};
 
class ImageExternalTextureGLImpeller : public ImageExternalTextureGL {
 public:
  ImageExternalTextureGLImpeller(
      const std::shared_ptr<impeller::ContextGLES>& context,
      int64_t id,
      const fml::jni::ScopedJavaGlobalRef<jobject>&
          hardware_buffer_texture_entry,
      const std::shared_ptr<PlatformViewAndroidJNI>& jni_facade);
 
 private:
  void Attach(PaintContext& context) override;
  void Detach() override;
 
  sk_sp<flutter::DlImage> CreateDlImage(
      PaintContext& context,
      const SkRect& bounds,
      std::optional<HardwareBufferKey> id,
      impeller::UniqueEGLImageKHR&& egl_image) override;
 
  const std::shared_ptr<impeller::ContextGLES> impeller_context_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(ImageExternalTextureGLImpeller);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_ANDROID_IMAGE_EXTERNAL_TEXTURE_GL_H_