apply plugin: "groovy"

repositories {
    mavenCentral()
}

compileGroovy {
    if (JavaVersion.current().isJava9()) {
        options.compilerArgs += ['--add-modules', 'javafx.graphics']
        groovyOptions.forkOptions.jvmArgs += ['--add-modules', 'javafx.graphics']
    }

	// The JFIF specification says:
	//	Y' =  0.2990*R + 0.5870*G + 0.1140*B
	//	Cb = -0.1687*R - 0.3313*G + 0.5000*B + 128
	//	Cr =  0.5000*R - 0.4187*G - 0.0813*B + 128
	// https://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'.

	r1 := int32(r)
	g1 := int32(g)
	b1 := int32(b)

	// yy is in range [0,0xff].
	//
	// Note that 19595 + 38470 + 7471 equals 65536.

image/ief                      ief              # Image Exchange
image/jpeg                     jpeg jpg jpe     # JPG image file
image/png                      png              # Portable Network Graphics
image/tiff                     tiff tif         # TIFF image file
image/x-cmu-raster             ras              #
image/x-portable-anymap        pnm              #
image/x-portable-bitmap        pbm              #

			return nil
		}
	}
}

func (d *decoder) readGraphicControl() error {
	if err := readFull(d.r, d.tmp[:6]); err != nil {
		return fmt.Errorf("gif: can't read graphic control: %s", err)
	}
	if d.tmp[0] != 4 {
		return fmt.Errorf("gif: invalid graphic control extension block size: %d", d.tmp[0])
	}
	flags := d.tmp[1]
	d.disposalMethod = (flags & gcDisposalMethodMask) >> 2
	d.delayTime = int(d.tmp[2]) | int(d.tmp[3])<<8

				return 0, w.err
			}
		}
	}
	n = len(p)
	code := w.savedCode
	if code == invalidCode {
		// This is the first write; send a clear code.
		// https://www.w3.org/Graphics/GIF/spec-gif89a.txt Appendix F
		// "Variable-Length-Code LZW Compression" says that "Encoders should
		// output a Clear code as the first code of each image data stream".
		//

var testGIF = []byte{
	'G', 'I', 'F', '8', '9', 'a',
	1, 0, 1, 0, // w=1, h=1 (6)
	128, 0, 0, // headerFields, bg, aspect (10)
	0, 0, 0, 1, 1, 1, // color table and graphics control (13)
	0x21, 0xf9, 0x04, 0x00, 0x00, 0x00, 0xff, 0x00, // (19)
	// frame 1 (0,0 - 1,1)
	0x2c,
	0x00, 0x00, 0x00, 0x00,
	0x01, 0x00, 0x01, 0x00, // (32)
	0x00,

  <mime-type type="application/vnd.oasis.opendocument.graphics">
    <alias type="application/x-vnd.oasis.opendocument.graphics"/>
    <_comment>OpenDocument v1.0: Graphics document (Drawing)</_comment>
    <magic>
      <match type="string" offset="0" value="PK">
        <match type="string" offset="30"
               value="mimetypeapplication/vnd.oasis.opendocument.graphics"/>
      </match>
    </magic>

      // But in gcd(a - b, b), a - b is even and b is odd, so we can divide out powers of two.

      // We bend over backwards to avoid branching, adapting a technique from
      // http://graphics.stanford.edu/~seander/bithacks.html#IntegerMinOrMax

      int delta = a - b; // can't overflow, since a and b are nonnegative

      int minDeltaOrZero = delta & (delta >> (Integer.SIZE - 1));

				"application/vnd.oasis.opendocument.database",
				"application/vnd.oasis.opendocument.formula",
				"application/vnd.oasis.opendocument.formula-template",
				"application/vnd.oasis.opendocument.graphics",
				"application/vnd.oasis.opendocument.graphics-template",
				"application/vnd.oasis.opendocument.image",
				"application/vnd.oasis.opendocument.image-template",
				"application/vnd.oasis.opendocument.presentation",

      // But in gcd(a - b, b), a - b is even and b is odd, so we can divide out powers of two.

      // We bend over backwards to avoid branching, adapting a technique from
      // http://graphics.stanford.edu/~seander/bithacks.html#IntegerMinOrMax

      int delta = a - b; // can't overflow, since a and b are nonnegative

      int minDeltaOrZero = delta & (delta >> (Integer.SIZE - 1));