vx_training_03.c

/* Copyright (C) 2022 RidgeRun, LLC (http://www.ridgerun.com)
 * All Rights Reserved.
 *
 * The contents of this software are proprietary and confidential to RidgeRun,
 * LLC.  No part of this program may be photocopied, reproduced or translated
 * into another programming language without prior written consent of
 * RidgeRun, LLC.  The user is free to modify the source code after obtaining
 * a software license from RidgeRun.  All source code changes must be provided
 * back to RidgeRun without any encumbrance.
 */

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

#include <stdio.h>
#include <VX/vx.h>

static int
populate_image (vx_image image, const unsigned char *img_data)
{
  int ret = -1;

  int width = 0;
  int height = 0;
  int channels = 3;
  vxQueryImage (image, VX_IMAGE_WIDTH, &width, sizeof (width));
  vxQueryImage (image, VX_IMAGE_WIDTH, &height, sizeof (height));

  vx_imagepatch_addressing_t layout = { width, height, channels,
      width*channels, 0, 0, 0, 0 };
  
  const vx_rectangle_t rect = { 0, 0, width, height };

  vx_status status = vxCopyImagePatch (image, &rect, 0, &layout, (void *)img_data,
      VX_WRITE_ONLY, VX_MEMORY_TYPE_HOST);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to copy data into image: %d\n", status);
    ret = -1;
  } else {
    ret = 0;
  }

  return ret;
}

static void VX_CALLBACK
context_log_callback(vx_context context, vx_reference ref, vx_status status,
    const vx_char string[])
{
  printf ("vx-training: %s\n", string);
}

int
main (int argc, char *argv[])
{
  int ret = -1;

  const char *filename = "lena.png";
  if (argc >= 2) {
    filename = argv[1];
  }
  
  vx_context context = vxCreateContext ();

  vx_status status = vxGetStatus ((vx_reference)context);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to create context: %d\n", status);;
    goto free_context;
  }

  vx_bool reentrant = vx_false_e;
  vxRegisterLogCallback(context, context_log_callback, reentrant);

  int width = 0;
  int height = 0;
  int channels = 0;
  unsigned char *img_data = stbi_load (filename, &width, &height, &channels, 3);
  if (NULL == img_data) {
    fprintf (stderr, "vx-training: Unable to load image \"%s\"\n", filename);
    goto free_context;
  }
  
  vx_image in_image = vxCreateImage(context, width, height, VX_DF_IMAGE_RGB);

  status = vxGetStatus ((vx_reference)in_image);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to create input image: %d\n", status);
    goto free_in_img;
  }

  if (0 != populate_image (in_image, img_data)) {
    fprintf (stderr, "vx-training: Unable to populate image\n");
    goto free_in_img;
  }

  vx_image out_image = vxCreateImage(context, width, height, VX_DF_IMAGE_U8);

  status = vxGetStatus ((vx_reference)out_image);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to create output image: %d\n", status);
    goto free_out_img;
  }

  vx_graph graph = vxCreateGraph (context);

  status = vxGetStatus ((vx_reference)graph);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to create graph: %d\n", status);
    goto free_graph;
  }

  vx_node node = vxChannelExtractNode(graph, in_image, VX_CHANNEL_Y, out_image);

  status = vxGetStatus ((vx_reference)node);
  if (VX_SUCCESS != status) {
    fprintf (stderr, "vx-training: Unable to create processing node: %d\n", status);
    goto free_node;
  }
    
  ret = 0;

 free_node:
  vxReleaseNode (&node);
  
 free_graph:
  vxReleaseGraph (&graph);

 free_out_img:
  vxReleaseImage (&out_image);
  
 free_in_img:
  vxReleaseImage (&in_image);

 free_img_data:
  free (img_data);
  
 free_context:
  vxReleaseContext (&context);

 out:
  return ret;
}