vx_tutorial_image_load_save.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <VX/vx.h>
#include <utility.h>

/* in some systems file IO is not present, so skip it using below flag */
/* #define SKIP_FILEIO */

#define IN_FILE_NAME       "${VX_TEST_DATA_PATH}/colors.bmp"

#define OUT_FILE_NAME      "${VX_TEST_DATA_PATH}/vx_tutorial_image_load_save_out.bmp"

void vx_tutorial_image_load_save()
{
    vx_context context;
    vx_image image;
    vx_uint32 width, height;

    printf(" vx_tutorial_image_load_save: Tutorial Started !!! \n");

    context = vxCreateContext();
    printf(" Loading file %s ...\n", IN_FILE_NAME);

    image = tivx_utils_create_vximage_from_bmpfile(context, IN_FILE_NAME, (vx_bool)vx_false_e);
    vxQueryImage(image, (vx_enum)VX_IMAGE_WIDTH, &width, sizeof(vx_uint32));
    vxQueryImage(image, (vx_enum)VX_IMAGE_HEIGHT, &height, sizeof(vx_uint32));
    printf(" Loaded image of dimensions %d x %d\n", width, height);

    printf(" Saving to file %s ...\n", OUT_FILE_NAME);

    tivx_utils_save_vximage_to_bmpfile(OUT_FILE_NAME, image);
    vxReleaseImage(&image);
    vxReleaseContext(&context);
    printf(" vx_tutorial_image_load_save: Tutorial Done !!! \n");
    printf(" \n");
}

void ascii_file_read(char *filename, int num_elements, void* buffer, vx_enum data_type){
    FILE* ptr_file;

    // Initialize buffer for reading each line of file
    int nbytes = sizeof(float);
    char* buff = malloc(nbytes);

    if (NULL == buff)
    {
        printf("FAILED ALLOCATING MEMORY\n");
        return;
    }

    // Initialize variables for tokenizing each line based on delimiter values
    char* token;
    char* delim = " \n\t,";
    float val;

    // Initialize different data type arrays
    vx_uint8* u8;
    vx_int32* i32;
    vx_float32* f32;
    uint8_t val_u8;
    int32_t val_int32;

    // Try reading in file
    ptr_file = fopen(filename, "r");
    if(!ptr_file){
        printf("FAILED READING FILE\n");
        free(buff);
        return;
    }

    // If file read is successful, try to populate matrix
    int i = 0;
    while(fgets(buff, nbytes, ptr_file) > 0){
        // Split string into tokens at whitespaces, commas, newlines, or tabs
        for(token = strtok(buff, delim); token != NULL; token = strtok(NULL, delim)){
            val = strtod(token, NULL);

            switch(data_type){
                case (vx_enum)VX_TYPE_FLOAT32:
                    f32 = buffer;
                    f32[i] = val;
                    break;

                case (vx_enum)VX_TYPE_UINT8:
                    u8 = buffer;
                    val_u8 = val;
                    u8[i] = val_u8;
                    break;

                case (vx_enum)VX_TYPE_INT32:
                    i32 = buffer;
                    val_int32 = val;
                    i32[i] = val_int32;
                    break;

                default:
                    break;
            }

            i++;
            if (i >= num_elements){
                break;
            }
        }
        // Need to break out of both loops when this condition is met
        if (i >= num_elements){
            break;
        }
    }
    fclose(ptr_file);
    free(buff);
    //printf("val of first element: %d\n", u8[0]);
}

vx_matrix create_matrix_from_file(vx_context context, vx_enum data_type, int cols, int rows, char *filename){
    // Create vx_float32 buffer object
    vx_float32 mat[rows*cols];

    // Call generic function that will populate data object
    ascii_file_read(filename, rows*cols, mat, data_type);

    // Create vx_matrix object
    vx_matrix matrix = vxCreateMatrix(context, data_type, cols, rows);

    // Set pointer reference between vx_float32 data object and
    vxCopyMatrix(matrix, mat, (vx_enum)VX_WRITE_ONLY, (vx_enum)VX_MEMORY_TYPE_HOST);

    return matrix;
}

vx_status save_pyramid_to_file(char *filename, vx_pyramid pyr, vx_size levels){
    vx_status status = (vx_status)VX_SUCCESS;
    vx_uint32 index;
    vx_image image;

    printf("Saving pyramid object...\n");
    for (index=0; index<levels; index++){
        // Create buffer for filename
        char img_filename[1000] = "";
        strcat(img_filename, filename);

        // Create new filename for each level
        char img_index[16] = "";
        sprintf(img_index, "%d.bmp", index);
        strcat(img_filename, img_index);
        printf("New filename: %s", img_filename);

        // Save each level
        image = vxGetPyramidLevel(pyr, index);
        status = tivx_utils_save_vximage_to_bmpfile(img_filename, image);
        status = vxReleaseImage(&image);
    }

    return status;
}