fl_egl_image.cc

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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.
 
#include "fl_egl_image.h"
 
#include <epoxy/egl.h>
#include <epoxy/gl.h>
 
struct _FlEGLImage {
  GObject parent_instance;
 
  EGLImage image;
};
 
static EGLImage create_egl_image(GLuint texture_id) {
  EGLDisplay egl_display = eglGetCurrentDisplay();
  if (egl_display == EGL_NO_DISPLAY) {
    g_warning("Failed to create EGL image: Failed to get current EGL display");
    return EGL_NO_IMAGE_KHR;
  }
 
  EGLContext egl_context = eglGetCurrentContext();
  if (egl_context == EGL_NO_CONTEXT) {
    g_warning("Failed to create EGL image: Failed to get current EGL context");
    return EGL_NO_IMAGE_KHR;
  }
 
  return eglCreateImageKHR(
      egl_display, egl_context, EGL_GL_TEXTURE_2D,
      reinterpret_cast<EGLClientBuffer>(static_cast<intptr_t>(texture_id)),
      nullptr);
}
 
G_DEFINE_TYPE(FlEGLImage, fl_egl_image, G_TYPE_OBJECT)
 
static void fl_egl_image_dispose(GObject* object) {
  FlEGLImage* self = FL_EGL_IMAGE(object);
 
  if (self->image != EGL_NO_IMAGE_KHR) {
    EGLDisplay egl_display = eglGetCurrentDisplay();
    if (egl_display == EGL_NO_DISPLAY) {
      g_warning(
          "Failed to destroy EGL image: Failed to get current EGL display");
    } else {
      eglDestroyImageKHR(egl_display, self->image);
    }
  }
 
  G_OBJECT_CLASS(fl_egl_image_parent_class)->dispose(object);
}
 
static void fl_egl_image_class_init(FlEGLImageClass* klass) {
  G_OBJECT_CLASS(klass)->dispose = fl_egl_image_dispose;
}
 
static void fl_egl_image_init(FlEGLImage* self) {}
 
FlEGLImage* fl_egl_image_new(GLuint texture) {
  FlEGLImage* self =
      FL_EGL_IMAGE(g_object_new(fl_egl_image_get_type(), nullptr));
 
  self->image = create_egl_image(texture);
 
  return self;
}
 
EGLImage fl_egl_image_get_image(FlEGLImage* image) {
  g_return_val_if_fail(FL_IS_EGL_IMAGE(image), EGL_NO_IMAGE_KHR);
  return image->image;
}