88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
#include <stdio.h>
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#include <stdlib.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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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;
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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 tileBufSize = TIFFTileSize(tif);
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if (tileBufSize == 0)
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{
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printf("TIFFTileSize returned 0. Possibly not tiled.\n");
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TIFFClose(tif);
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return 1;
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}
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// 分配一个缓冲区用于存放一个 tile 的像素数据（未压缩）
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uint8_t *tileBuf = (uint8_t *)_TIFFmalloc(tileBufSize);
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if (!tileBuf)
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{
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fprintf(stderr, "Failed to allocate tile buffer.\n");
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TIFFClose(tif);
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return 1;
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}
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// 遍历每个 tile 并解码为像素数据
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for (uint32 i = 0; i < totalTiles; i++)
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{
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// 读取 tile 编号 i，解码为原始像素，存入 tileBuf
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tsize_t readBytes = TIFFReadEncodedTile(tif, i, tileBuf, tileBufSize);
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if (readBytes == -1)
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{
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fprintf(stderr, "Failed to decode tile %d\n", i);
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continue;
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}
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printf("Tile %3d: Decoded %6ld bytes (uncompressed pixel data)\n",
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i, (long)readBytes);
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// 示例：打印前4个像素（假设每像素 samplesPerPixel 个 uint8 通道）
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for (int px = 0; px < 4 && px < (readBytes / samplesPerPixel); px++)
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{
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printf(" Pixel %d: ", px);
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for (int s = 0; s < samplesPerPixel; s++)
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{
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printf("%3u ", tileBuf[px * samplesPerPixel + s]);
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}
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printf("\n");
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}
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}
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_TIFFfree(tileBuf);
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TIFFClose(tif);
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return 0;
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}
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