examples of libimg (img_convert_data)?

I try to use libimg to load and display an image. It is the work of 3/4. Specifically, the image is at RGB888 format, and the Cascades ImageData object RGBX, if I get a fresh crushed and somewhere between mono effect and color.

I try to use img_convert_data() to convert the data, but it doesn't seem to do anything. The destination buffer that I spell him unchanged. If I memset 0xD0 buffer before calling img_convert_data(), then the image is displayed as a gray solid. img_convert_data() returns IMG_ERR_OK, so I don't even have a mistake to work with...

An abbreviated version of what I have is:

img_t img;

img_format_t new_format = IMG_FMT_RGBA8888;

uint8_t * new_data;

size_t new_bpl;

int rc;

RC = img_load_file (ilib, filename, NULL, &img);)

new_bpl = IMG_FMT_BPL (new_format, img.w);

new_data = (uint8_t *) malloc(new_bpl * img.h);

RC = img_convert_data (img.format, img.access.direct.data, new_format, you see, N);

I tried some numbers for N ("the number of samples to convert"), because I do not know what is required. 1 does not work, does not img.h, new_bpl * img.h segfaults...

What Miss me?

Hey, I'm working on this picture library on QNX. The problem you are having is that you pass in the number of bytes to img_convert_data() instead of the number of 'samples' that is, pixels. For example, IMG_FMT_RGBA8888 has four bytes per pixel, so you ask to convert four times more data is present.

I tried my best to reproduce your example with the following program:

#include 
#include 
#include 
#include 

#include 

int main(int argc, char ** argv)
{

    if (argc != 2) {
        printf("Usage: %s [filename]\n", argv[0]);
        printf(" e.g. %s /path/to/some/photo.jpg\n", argv[0]);
        return 1;
    }

    // attach image library (loads codecs)
    img_lib_t ilib;
    int rc = img_lib_attach(&ilib);
    if (rc != IMG_ERR_OK) {
        printf("img_lib_attach() failed: %d\n", rc);
        return 1;
    }

    // load image
    img_t img;
    memset(&img, 0, sizeof(img_t));
    // I'm putting this here to make sure I already have an RGB image to convert up to RGBA later
    img.format = IMG_FMT_RGB888;
    img.flags |= IMG_FORMAT;
    rc = img_load_file(ilib, argv[1], NULL, &img);
    if (rc != IMG_ERR_OK) {
        printf("img_load_file() failed: %d\n", rc);
        return 1;
    }
    printf("img_load_file() succeeded\n");

    // convert image
    img_format_t new_format = IMG_FMT_RGBA8888;
    size_t new_bpl = IMG_FMT_BPL(new_format, img.w);
    uint8_t * new_data = malloc(new_bpl * img.h);
    rc = img_convert_data(img.format, img.access.direct.data, new_format, new_data, img.h * img.w);
    if (rc != IMG_ERR_OK) {
        printf("img_convert_data() failed: %d\n", rc);
        return 1;
    }
    printf("img_convert_data() succeeded\n");

    return 0;
}

I tested with a PNG that I and the conversion worked successfully.

In general, it's probably more idiomatic to specify the destination format before loading the image to let the img lib to do the conversion for you. The advantage is that the img_t will be updated with the data, as well as good stride, format indicators, etc.

Chris

Tags: BlackBerry Developers

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