59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
#include <stdio.h>
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#include <tiffio.h>
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int main()
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{
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TIFF *tif = TIFFOpen("imgs/ortho.tif", "r");
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if (!tif)
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{
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printf("Failed to open file.\n");
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return 1;
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}
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uint32 tileWidth, tileHeight;
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TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tileWidth);
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TIFFGetField(tif, TIFFTAG_TILELENGTH, &tileHeight);
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printf("Tile size: %dx%d\n", tileWidth, tileHeight);
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uint32 imageWidth, imageHeight;
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TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imageWidth);
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageHeight);
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uint32 tilesAcross = (imageWidth + tileWidth - 1) / tileWidth;
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uint32 tilesDown = (imageHeight + tileHeight - 1) / tileHeight;
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uint32 totalTiles = tilesAcross * tilesDown;
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printf("Tile count: %d x %d = %d\n", tilesAcross, tilesDown, totalTiles);
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uint16 samplesPerPixel;
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uint16 bitsPerSample;
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TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel);
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TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample);
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// 一个像素有几个通道sample，一个sample有多少位
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printf("Samples per pixel: %d\n", samplesPerPixel);
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printf("Bits per sample: %d\n", bitsPerSample);
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uint16 sampleFormat = SAMPLEFORMAT_UINT; // 默认无符号
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TIFFGetField(tif, TIFFTAG_SAMPLEFORMAT, &sampleFormat);
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printf("Sample format: %d\n", sampleFormat); // 1=uint, 2=int, 3=float
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tsize_t *byteCounts = NULL;
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toff_t *offsets = NULL;
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TIFFGetField(tif, TIFFTAG_TILEBYTECOUNTS, &byteCounts);
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TIFFGetField(tif, TIFFTAG_TILEOFFSETS, &offsets);
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for (uint32 i = 0; i < totalTiles; i++)
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{
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printf("Tile %3d: Offset = %8llu, Size = %6lu bytes\n",
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i,
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(unsigned long long)offsets[i],
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(unsigned long)byteCounts[i]);
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}
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TIFFClose(tif);
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return 0;
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}
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