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Diffstat (limited to 'Godeps/_workspace/src/golang.org/x/image/math/fixed/fixed.go')
| -rw-r--r-- | Godeps/_workspace/src/golang.org/x/image/math/fixed/fixed.go | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/Godeps/_workspace/src/golang.org/x/image/math/fixed/fixed.go b/Godeps/_workspace/src/golang.org/x/image/math/fixed/fixed.go deleted file mode 100644 index 7af56d9ee..000000000 --- a/Godeps/_workspace/src/golang.org/x/image/math/fixed/fixed.go +++ /dev/null @@ -1,172 +0,0 @@ -// Copyright 2015 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Package fixed implements fixed-point integer types. -package fixed - -import ( - "fmt" -) - -// TODO: implement fmt.Formatter for %f and %g. - -// I returns the integer value i as an Int26_6. -// -// For example, passing the integer value 2 yields Int26_6(128). -func I(i int) Int26_6 { - return Int26_6(i << 6) -} - -// Int26_6 is a signed 26.6 fixed-point number. -// -// The integer part ranges from -33554432 to 33554431, inclusive. The -// fractional part has 6 bits of precision. -// -// For example, the number one-and-a-quarter is Int26_6(1<<6 + 1<<4). -type Int26_6 int32 - -// String returns a human-readable representation of a 26.6 fixed-point number. -// -// For example, the number one-and-a-quarter becomes "1:16". -func (x Int26_6) String() string { - const shift, mask = 6, 1<<6 - 1 - if x >= 0 { - return fmt.Sprintf("%d:%02d", int32(x>>shift), int32(x&mask)) - } - x = -x - if x >= 0 { - return fmt.Sprintf("-%d:%02d", int32(x>>shift), int32(x&mask)) - } - return "-33554432:00" // The minimum value is -(1<<25). -} - -// Int52_12 is a signed 52.12 fixed-point number. -// -// The integer part ranges from -2251799813685248 to 2251799813685247, -// inclusive. The fractional part has 12 bits of precision. -// -// For example, the number one-and-a-quarter is Int52_12(1<<12 + 1<<10). -type Int52_12 int64 - -// String returns a human-readable representation of a 52.12 fixed-point -// number. -// -// For example, the number one-and-a-quarter becomes "1:1024". -func (x Int52_12) String() string { - const shift, mask = 12, 1<<12 - 1 - if x >= 0 { - return fmt.Sprintf("%d:%04d", int64(x>>shift), int64(x&mask)) - } - x = -x - if x >= 0 { - return fmt.Sprintf("-%d:%04d", int64(x>>shift), int64(x&mask)) - } - return "-2251799813685248:0000" // The minimum value is -(1<<51). -} - -// P returns the integer values x and y as a Point26_6. -// -// For example, passing the integer values (2, -3) yields Point26_6{128, -192}. -func P(x, y int) Point26_6 { - return Point26_6{Int26_6(x << 6), Int26_6(y << 6)} -} - -// Point26_6 is a 26.6 fixed-point coordinate pair. -// -// It is analogous to the image.Point type in the standard library. -type Point26_6 struct { - X, Y Int26_6 -} - -// Add returns the vector p+q. -func (p Point26_6) Add(q Point26_6) Point26_6 { - return Point26_6{p.X + q.X, p.Y + q.Y} -} - -// Sub returns the vector p-q. -func (p Point26_6) Sub(q Point26_6) Point26_6 { - return Point26_6{p.X - q.X, p.Y - q.Y} -} - -// Mul returns the vector p*k. -func (p Point26_6) Mul(k Int26_6) Point26_6 { - return Point26_6{p.X * k / 64, p.Y * k / 64} -} - -// Div returns the vector p/k. -func (p Point26_6) Div(k Int26_6) Point26_6 { - return Point26_6{p.X * 64 / k, p.Y * 64 / k} -} - -// Point52_12 is a 52.12 fixed-point coordinate pair. -// -// It is analogous to the image.Point type in the standard library. -type Point52_12 struct { - X, Y Int52_12 -} - -// Add returns the vector p+q. -func (p Point52_12) Add(q Point52_12) Point52_12 { - return Point52_12{p.X + q.X, p.Y + q.Y} -} - -// Sub returns the vector p-q. -func (p Point52_12) Sub(q Point52_12) Point52_12 { - return Point52_12{p.X - q.X, p.Y - q.Y} -} - -// Mul returns the vector p*k. -func (p Point52_12) Mul(k Int52_12) Point52_12 { - return Point52_12{p.X * k / 4096, p.Y * k / 4096} -} - -// Div returns the vector p/k. -func (p Point52_12) Div(k Int52_12) Point52_12 { - return Point52_12{p.X * 4096 / k, p.Y * 4096 / k} -} - -// R returns the integer values minX, minY, maxX, maxY as a Rectangle26_6. -// -// For example, passing the integer values (0, 1, 2, 3) yields -// Rectangle26_6{Point26_6{0, 64}, Point26_6{128, 192}}. -// -// Like the image.Rect function in the standard library, the returned rectangle -// has minimum and maximum coordinates swapped if necessary so that it is -// well-formed. -func R(minX, minY, maxX, maxY int) Rectangle26_6 { - if minX > maxX { - minX, maxX = maxX, minX - } - if minY > maxY { - minY, maxY = maxY, minY - } - return Rectangle26_6{ - Point26_6{ - Int26_6(minX << 6), - Int26_6(minY << 6), - }, - Point26_6{ - Int26_6(maxX << 6), - Int26_6(maxY << 6), - }, - } -} - -// Rectangle26_6 is a 26.6 fixed-point coordinate rectangle. The Min bound is -// inclusive and the Max bound is exclusive. It is well-formed if Min.X <= -// Max.X and likewise for Y. -// -// It is analogous to the image.Rectangle type in the standard library. -type Rectangle26_6 struct { - Min, Max Point26_6 -} - -// Rectangle52_12 is a 52.12 fixed-point coordinate rectangle. The Min bound is -// inclusive and the Max bound is exclusive. It is well-formed if Min.X <= -// Max.X and likewise for Y. -// -// It is analogous to the image.Rectangle type in the standard library. -type Rectangle52_12 struct { - Min, Max Point52_12 -} |