/*
 * test_plane_dump.c — 宿主解码正确性校验：把 meow_font 解码出的打包像素面 dump 成二进制，
 * 供 Python 参考解码（zlib IDAT + 反滤波）逐字节比对，验证流式解码与参考解码完全一致。
 * 需以 -DMEOW_FONT_ENABLE_DEBUG 编译 meow_font.c 暴露 meow_font_debug_plane。
 */
#include "meow_font.h"
#include <stdio.h>
#include <string.h>

/* 宿主调试钩子：定义于 meow_font.c（MEOW_FONT_ENABLE_DEBUG 下才编译）；此测试自带声明。 */
extern const unsigned char *meow_font_debug_plane(int slot, unsigned *w, unsigned *h,
                                                  unsigned *depth, size_t *rowbytes);

int main(int argc, char **argv) {
    if (argc < 4) { fprintf(stderr, "usage: %s <font.png> <font.idx> <out.raw>\n", argv[0]); return 2; }
    int r = meow_font_load(argv[1], argv[2]);
    if (r != 0) { fprintf(stderr, "load failed %d\n", r); return 1; }
    unsigned w, h, depth; size_t rb;
    const unsigned char *p = meow_font_debug_plane(0, &w, &h, &depth, &rb);
    if (!p) { fprintf(stderr, "no plane\n"); return 1; }
    size_t total = (size_t)rb * h;
    FILE *f = fopen(argv[3], "wb");
    if (!f) { return 1; }
    /* 先写出几何头（小端），再写平面字节 */
    unsigned hdr[5] = { w, h, depth, (unsigned)rb, (unsigned)total };
    fwrite(hdr, sizeof(unsigned), 5, f);
    fwrite(p, 1, total, f);
    fclose(f);
    printf("dumped w=%u h=%u depth=%u rowbytes=%zu bytes=%zu\n", w, h, depth, rb, total);
    meow_font_unload();
    return 0;
}