#include <stdio.h>
#include <tiffio.h>

int main()
{
    TIFF *tif = TIFFOpen("imgs/ortho.tif", "r");
    if (!tif)
    {
        printf("Failed to open file.\n");
        return 1;
    }

    uint32 tileWidth, tileHeight;
    TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tileWidth);
    TIFFGetField(tif, TIFFTAG_TILELENGTH, &tileHeight);
    printf("Tile size: %dx%d\n", tileWidth, tileHeight);

    uint32 imageWidth, imageHeight;
    TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imageWidth);
    TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageHeight);

    uint32 tilesAcross = (imageWidth + tileWidth - 1) / tileWidth;
    uint32 tilesDown = (imageHeight + tileHeight - 1) / tileHeight;
    uint32 totalTiles = tilesAcross * tilesDown;
    printf("Tile count: %d x %d = %d\n", tilesAcross, tilesDown, totalTiles);

    uint16 samplesPerPixel;
    uint16 bitsPerSample;

    TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel);
    TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample);

    // 一个像素有几个通道sample，一个sample有多少位
    printf("Samples per pixel: %d\n", samplesPerPixel);
    printf("Bits per sample: %d\n", bitsPerSample);

    uint16 sampleFormat = SAMPLEFORMAT_UINT; // 默认无符号
    TIFFGetField(tif, TIFFTAG_SAMPLEFORMAT, &sampleFormat);

    printf("Sample format: %d\n", sampleFormat); // 1=uint, 2=int, 3=float

    tsize_t *byteCounts = NULL;
    toff_t *offsets = NULL;

    TIFFGetField(tif, TIFFTAG_TILEBYTECOUNTS, &byteCounts);
    TIFFGetField(tif, TIFFTAG_TILEOFFSETS, &offsets);

    for (uint32 i = 0; i < totalTiles; i++)
    {
        printf("Tile %3d: Offset = %8llu, Size = %6lu bytes\n",
               i,
               (unsigned long long)offsets[i],
               (unsigned long)byteCounts[i]);
    }

    TIFFClose(tif);
    return 0;
}