private static void testJpegOutput(JpegImage jpeg, CompressionParameters parameters, string jpegFileName)
{
using (FileStream output = new FileStream(jpegFileName, FileMode.Create))
jpeg.WriteJpeg(output, parameters);
FileAssert.AreEqual(jpegFileName, Tester.MapExpectedPath(jpegFileName));
}
private static void testBitmapOutput(JpegImage jpeg, string bitmapFileName)
{
using (FileStream output = new FileStream(bitmapFileName, FileMode.Create))
jpeg.WriteBitmap(output);
FileAssert.AreEqual(bitmapFileName, Tester.MapExpectedPath(bitmapFileName));
}
private static void testJpegFromBitmap(Bitmap bmp, string jpegFileName)
{
using (JpegImage jpeg = new JpegImage(bmp))
{
Assert.AreEqual(jpeg.Width, bmp.Width);
Assert.AreEqual(jpeg.Height, bmp.Height);
Assert.AreEqual(jpeg.ComponentsPerSample, 3);//Number of components in Bitmap
using (FileStream output = new FileStream(jpegFileName, FileMode.Create))
jpeg.WriteJpeg(output);
}
FileAssert.AreEqual(jpegFileName, Tester.MapExpectedPath(jpegFileName));
}
public void TestCompressorWithContextRows()
{
using (MemoryStream stream = new MemoryStream())
{
jpeg_compress_struct compressor = new jpeg_compress_struct(new jpeg_error_mgr());
compressor.Image_height = 100;
compressor.Image_width = 100;
compressor.In_color_space = J_COLOR_SPACE.JCS_GRAYSCALE;
compressor.Input_components = 1;
compressor.jpeg_set_defaults();
compressor.Dct_method = J_DCT_METHOD.JDCT_IFAST;
compressor.Smoothing_factor = 94;
compressor.jpeg_set_quality(75, true);
compressor.jpeg_simple_progression();
compressor.Density_unit = DensityUnit.Unknown;
compressor.X_density = (short)96;
compressor.Y_density = (short)96;
compressor.jpeg_stdio_dest(stream);
compressor.jpeg_start_compress(true);
byte[][] rowForDecompressor = new byte[1][];
int bytesPerPixel = 1;
while (compressor.Next_scanline < compressor.Image_height)
{
byte[] row = new byte[100 * bytesPerPixel]; // wasteful, but gets you 0 bytes every time - content is immaterial.
rowForDecompressor[0] = row;
compressor.jpeg_write_scanlines(rowForDecompressor, 1);
}
compressor.jpeg_finish_compress();
byte[] bytes = stream.ToArray();
string filename = "TestCompressorWithContextRows.jpg";
File.WriteAllBytes(Tester.MapOutputPath(filename), bytes);
FileAssert.AreEqual(Tester.MapExpectedPath(filename), Tester.MapOutputPath(filename));
}
}
