limine/common/lib/image.c

#include <stdint.h>
#include <stddef.h>
#include <lib/image.h>
#include <lib/config.h>
#include <lib/misc.h>
#include <mm/pmm.h>
#include <stb/stb_image.h>

void image_make_centered(struct image *image, int frame_x_size, int frame_y_size, uint32_t back_colour) {
    image->type = IMAGE_CENTERED;

    image->x_displacement = frame_x_size / 2 - image->x_size / 2;
    image->y_displacement = frame_y_size / 2 - image->y_size / 2;
    image->back_colour = back_colour;
}


void image_make_stretched(struct image *image, int new_x_size, int new_y_size) {
    image->type = IMAGE_STRETCHED;

    image->x_size = new_x_size;
    image->y_size = new_y_size;
}

struct image *image_open(struct file_handle *file) {
    struct image *image = ext_mem_alloc(sizeof(struct image));

    image->type = IMAGE_TILED;

    void *src = ext_mem_alloc(file->size);

    fread(file, src, 0, file->size);

    int x, y, bpp;

    image->img = stbi_load_from_memory(src, file->size, &x, &y, &bpp, 4);

    pmm_free(src, file->size);

    if (image->img == NULL) {
        pmm_free(image, sizeof(struct image));
        return NULL;
    }

    // Convert ABGR to XRGB
    uint32_t *pptr = (void *)image->img;
    for (int i = 0; i < x * y; i++) {
        pptr[i] = (pptr[i] & 0x0000ff00) | ((pptr[i] & 0x00ff0000) >> 16) | ((pptr[i] & 0x000000ff) << 16);
    }

    image->x_size = x;
    image->y_size = y;
    image->pitch = x * 4;
    image->bpp = 32;
    image->img_width = x;
    image->img_height = y;

    return image;
}

void image_close(struct image *image) {
    stbi_image_free(image->img);
    pmm_free(image, sizeof(struct image));
}