59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
|
#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;
|
|||
|
|
}
|