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83 lines
2.1 KiB
83 lines
2.1 KiB
4 years ago
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/************************************************************************
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The images produced by this test are checkboard gradients. They
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ramp from black in the upper left corner to full color in the lower
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right corner.
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by Michael Garland, 1999.
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$Id: t-img.cxx 426 2004-09-27 04:34:55Z garland $
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************************************************************************/
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#include <gfx/gfx.h>
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#include <gfx/raster.h>
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static
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void grayscale_test()
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{
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ByteRaster img(256, 256, 1);
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int i, j, c;
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for(i=0; i<img.height(); i++) for(j=0; j<img.width(); j++)
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{
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c = ((((i&0x8)==0)^((j&0x8))==0))*(i+j)/2;
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img.pixel(j,i)[0] = c;
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}
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write_pnm_image("chex1.pgm", img);
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write_tiff_image("chex1.tif", img);
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write_png_image("chex1.png", img);
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write_jpeg_image("chex1.jpg", img);
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ByteRaster *pgm = read_pnm_image("chex1.pgm");
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ByteRaster *tif = read_tiff_image("chex1.tif");
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ByteRaster *png = read_png_image("chex1.png");
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ByteRaster *jpg = read_jpeg_image("chex1.jpg");
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if( pgm ) write_pnm_image("chex1-dup.pgm", *pgm);
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if( tif ) write_tiff_image("chex1-dup.tif", *tif);
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if( png ) write_png_image("chex1-dup.png", *png);
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if( jpg ) write_jpeg_image("chex1-dup.jpg", *jpg);
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}
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static
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void rgb_test()
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{
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ByteRaster img(256, 256, 3);
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int i, j, c;
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for(i=0; i<img.height(); i++) for(j=0; j<img.width(); j++)
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{
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c = ((((i&0x8)==0)^((j&0x8))==0))*(i+j)/2;
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img.pixel(j,i)[0] = c;
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img.pixel(j,i)[1] = c/2;
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img.pixel(j,i)[2] = c/4;
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}
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write_pnm_image("chex3.ppm", img);
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write_tiff_image("chex3.tif", img);
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write_png_image("chex3.png", img);
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write_jpeg_image("chex3.jpg", img);
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ByteRaster *ppm = read_pnm_image("chex3.ppm");
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ByteRaster *tif = read_tiff_image("chex3.tif");
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ByteRaster *png = read_png_image("chex3.png");
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ByteRaster *jpg = read_jpeg_image("chex3.jpg");
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if( ppm ) write_pnm_image("chex3-dup.ppm", *ppm);
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if( tif ) write_tiff_image("chex3-dup.tif", *tif);
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if( png ) write_png_image("chex3-dup.png", *png);
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if( jpg ) write_jpeg_image("chex3-dup.jpg", *jpg);
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}
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int main()
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{
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grayscale_test();
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rgb_test();
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return 0;
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}
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