first commit

.gitignore

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+# ---> C
+/imgs
+/.vscode
+/app
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+

README.md

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+# tiff-io_uring
+
+异步I/O读取geotiff。

tile_info.c

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+#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;
+}