libtiffを使ってみる(2) 書き込み

#include <iostream>

#ifdef _DEBUG
#pragma comment(lib, "tiffd.lib")
#else
#pragma comment(lib, "tiff.lib")
#endif

#include <tiffio.h>
#include <vector>
#include <cassert>

#pragma warning(disable:4996)

int main()
{
    // 保存する画像のサイズ
    std::uint32_t width = 2;
    std::uint32_t height = 4;

    // 画像を作成
    std::vector<std::uint8_t> mydata(width * height * 3);
    for (int x = 0; x < width; x++) {
        for (int y = 0; y < height; y++) {
            int pos = y * width + x;
            mydata[pos * 3 + 0] = float(pos) / (width*height) * 255;
            mydata[pos * 3 + 1] = 0;
            mydata[pos * 3 + 2] = 0;
        }
    }



    // tiffファイルの書き込み開始
    TIFF* out = TIFFOpen("D:\\Data\\test.tif", "w");


    TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
    TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);
    TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 3);   // RGB color
    TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);     // Per channel
    TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT /*ORIENTATION_BOTRIGHT*/);
    

    TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);//色の格納方法　RGBRGBRGBかRRRGGGBBBか等
    TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);//ピクセルデータの解釈方法

    tsize_t scanlinebytes = 3 * width;// mydataのスキャンライン計算

    TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, TIFFDefaultStripSize(out, scanlinebytes ));

    for (std::uint32_t row = 0; row < height; row++) {

        // row 行目の先頭アドレスを取得
        uint8_t* ptr = &mydata[0] + row * scanlinebytes;

        if (TIFFWriteScanline(out, ptr, row, 0) < 0)   // 書き込み
            break;
    }

    TIFFClose(out);

    return 0;
}