exceed memory limit

[qtbui159]

I have a 32-bit program use this code.

VipsImage* big = vips_image_new_from_file("C:\\Users\\Spike\\Desktop\\2-12.jpg", nullptr); // 30000x20000 jpg
VipsImage* small = vips_image_new_from_file("C:\\Users\\Spike\\Desktop\\ffsc.jpg", nullptr); // 1080x2400 jpg
int ret = vips_draw_image(big, small, 0, 0, nullptr); // ret = -1
string errorMessage = vips_error_buffer(); // 'vips_tracked: out of memory --- size == 2414MB

How can i make it run correctly?

[jcupitt]

Hello @qtbui159,

The draw_*() functions are there for paintbox-style programs which need to make small, in-place, iterative modifications to an image, so they need to keep the whole thing in memory. They can't do large images, and they are not threaded.

https://www.libvips.org/API/current/libvips-draw.html#libvips-draw.description

To paste one image into another, use insert, eg.:

VipsImage* big = vips_image_new_from_file("C:\\Users\\Spike\\Desktop\\2-12.jpg", nullptr); // 30000x20000 jpg
VipsImage* small = vips_image_new_from_file("C:\\Users\\Spike\\Desktop\\ffsc.jpg", nullptr); // 1080x2400 jpg
VipsImage *out;
if (vips_insert(big, small, &out, 0, 0, nullptr)) { ... error handling ... }

It'll run in very little memory, and it'll use all your CPU cores.

[qtbui159]

thx for your fast replying @jcupitt .
vips_insert solve my problem.