Add Go frontend, libgo library, and Go testsuite.
gcc/: * gcc.c (default_compilers): Add entry for ".go". * common.opt: Add -static-libgo as a driver option. * doc/install.texi (Configuration): Mention libgo as an option for --enable-shared. Mention go as an option for --enable-languages. * doc/invoke.texi (Overall Options): Mention .go as a file name suffix. Mention go as a -x option. * doc/frontends.texi (G++ and GCC): Mention Go as a supported language. * doc/sourcebuild.texi (Top Level): Mention libgo. * doc/standards.texi (Standards): Add section on Go language. Move references for other languages into their own section. * doc/contrib.texi (Contributors): Mention that I contributed the Go frontend. gcc/testsuite/: * lib/go.exp: New file. * lib/go-dg.exp: New file. * lib/go-torture.exp: New file. * lib/target-supports.exp (check_compile): Match // Go. From-SVN: r167407
This commit is contained in:
Ian Lance Taylor
parent
1aa6700378
commit
7a9389330e
1565 changed files with 351565 additions and 12 deletions
506
libgo/go/image/image.go
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506
libgo/go/image/image.go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The image package implements a basic 2-D image library.
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package image
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// A Config consists of an image's color model and dimensions.
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type Config struct {
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ColorModel ColorModel
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Width, Height int
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}
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// An Image is a finite rectangular grid of Colors drawn from a ColorModel.
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type Image interface {
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// ColorModel returns the Image's ColorModel.
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ColorModel() ColorModel
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// Bounds returns the domain for which At can return non-zero color.
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// The bounds do not necessarily contain the point (0, 0).
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Bounds() Rectangle
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// At returns the color of the pixel at (x, y).
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// At(Bounds().Min.X, Bounds().Min.Y) returns the upper-left pixel of the grid.
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// At(Bounds().Max.X-1, Bounds().Max.Y-1) returns the lower-right one.
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At(x, y int) Color
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}
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// An RGBA is an in-memory image of RGBAColor values.
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type RGBA struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []RGBAColor
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *RGBA) ColorModel() ColorModel { return RGBAColorModel }
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func (p *RGBA) Bounds() Rectangle { return p.Rect }
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func (p *RGBA) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return RGBAColor{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *RGBA) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toRGBAColor(c).(RGBAColor)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *RGBA) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewRGBA returns a new RGBA with the given width and height.
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func NewRGBA(w, h int) *RGBA {
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buf := make([]RGBAColor, w*h)
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return &RGBA{buf, w, Rectangle{ZP, Point{w, h}}}
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}
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// An RGBA64 is an in-memory image of RGBA64Color values.
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type RGBA64 struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []RGBA64Color
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *RGBA64) ColorModel() ColorModel { return RGBA64ColorModel }
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func (p *RGBA64) Bounds() Rectangle { return p.Rect }
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func (p *RGBA64) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return RGBA64Color{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *RGBA64) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toRGBA64Color(c).(RGBA64Color)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *RGBA64) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xffff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewRGBA64 returns a new RGBA64 with the given width and height.
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func NewRGBA64(w, h int) *RGBA64 {
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pix := make([]RGBA64Color, w*h)
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return &RGBA64{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// An NRGBA is an in-memory image of NRGBAColor values.
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type NRGBA struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []NRGBAColor
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *NRGBA) ColorModel() ColorModel { return NRGBAColorModel }
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func (p *NRGBA) Bounds() Rectangle { return p.Rect }
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func (p *NRGBA) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return NRGBAColor{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *NRGBA) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toNRGBAColor(c).(NRGBAColor)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *NRGBA) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewNRGBA returns a new NRGBA with the given width and height.
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func NewNRGBA(w, h int) *NRGBA {
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pix := make([]NRGBAColor, w*h)
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return &NRGBA{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// An NRGBA64 is an in-memory image of NRGBA64Color values.
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type NRGBA64 struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []NRGBA64Color
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *NRGBA64) ColorModel() ColorModel { return NRGBA64ColorModel }
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func (p *NRGBA64) Bounds() Rectangle { return p.Rect }
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func (p *NRGBA64) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return NRGBA64Color{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *NRGBA64) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toNRGBA64Color(c).(NRGBA64Color)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *NRGBA64) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xffff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewNRGBA64 returns a new NRGBA64 with the given width and height.
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func NewNRGBA64(w, h int) *NRGBA64 {
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pix := make([]NRGBA64Color, w*h)
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return &NRGBA64{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// An Alpha is an in-memory image of AlphaColor values.
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type Alpha struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []AlphaColor
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *Alpha) ColorModel() ColorModel { return AlphaColorModel }
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func (p *Alpha) Bounds() Rectangle { return p.Rect }
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func (p *Alpha) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return AlphaColor{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *Alpha) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toAlphaColor(c).(AlphaColor)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *Alpha) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewAlpha returns a new Alpha with the given width and height.
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func NewAlpha(w, h int) *Alpha {
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pix := make([]AlphaColor, w*h)
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return &Alpha{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// An Alpha16 is an in-memory image of Alpha16Color values.
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type Alpha16 struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []Alpha16Color
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *Alpha16) ColorModel() ColorModel { return Alpha16ColorModel }
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func (p *Alpha16) Bounds() Rectangle { return p.Rect }
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func (p *Alpha16) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return Alpha16Color{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *Alpha16) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toAlpha16Color(c).(Alpha16Color)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *Alpha16) Opaque() bool {
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if p.Rect.Empty() {
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return true
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}
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base := p.Rect.Min.Y * p.Stride
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i0, i1 := base+p.Rect.Min.X, base+p.Rect.Max.X
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for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ {
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for _, c := range p.Pix[i0:i1] {
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if c.A != 0xffff {
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return false
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}
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}
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i0 += p.Stride
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i1 += p.Stride
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}
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return true
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}
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// NewAlpha16 returns a new Alpha16 with the given width and height.
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func NewAlpha16(w, h int) *Alpha16 {
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pix := make([]Alpha16Color, w*h)
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return &Alpha16{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// A Gray is an in-memory image of GrayColor values.
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type Gray struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []GrayColor
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *Gray) ColorModel() ColorModel { return GrayColorModel }
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func (p *Gray) Bounds() Rectangle { return p.Rect }
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func (p *Gray) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return GrayColor{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *Gray) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toGrayColor(c).(GrayColor)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (p *Gray) Opaque() bool {
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return true
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}
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// NewGray returns a new Gray with the given width and height.
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func NewGray(w, h int) *Gray {
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pix := make([]GrayColor, w*h)
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return &Gray{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// A Gray16 is an in-memory image of Gray16Color values.
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type Gray16 struct {
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// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
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Pix []Gray16Color
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Stride int
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// Rect is the image's bounds.
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Rect Rectangle
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}
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func (p *Gray16) ColorModel() ColorModel { return Gray16ColorModel }
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func (p *Gray16) Bounds() Rectangle { return p.Rect }
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func (p *Gray16) At(x, y int) Color {
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if !p.Rect.Contains(Point{x, y}) {
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return Gray16Color{}
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}
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return p.Pix[y*p.Stride+x]
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}
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func (p *Gray16) Set(x, y int, c Color) {
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if !p.Rect.Contains(Point{x, y}) {
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return
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}
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p.Pix[y*p.Stride+x] = toGray16Color(c).(Gray16Color)
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}
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// Opaque scans the entire image and returns whether or not it is fully opaque.
|
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func (p *Gray16) Opaque() bool {
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return true
|
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}
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|
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// NewGray16 returns a new Gray16 with the given width and height.
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func NewGray16(w, h int) *Gray16 {
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pix := make([]Gray16Color, w*h)
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return &Gray16{pix, w, Rectangle{ZP, Point{w, h}}}
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}
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// A PalettedColorModel represents a fixed palette of colors.
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type PalettedColorModel []Color
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func diff(a, b uint32) uint32 {
|
||||
if a > b {
|
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return a - b
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||||
}
|
||||
return b - a
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||||
}
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||||
|
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// Convert returns the palette color closest to c in Euclidean R,G,B space.
|
||||
func (p PalettedColorModel) Convert(c Color) Color {
|
||||
if len(p) == 0 {
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return nil
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}
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cr, cg, cb, _ := c.RGBA()
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// Shift by 1 bit to avoid potential uint32 overflow in sum-squared-difference.
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cr >>= 1
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cg >>= 1
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||||
cb >>= 1
|
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result := Color(nil)
|
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bestSSD := uint32(1<<32 - 1)
|
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for _, v := range p {
|
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vr, vg, vb, _ := v.RGBA()
|
||||
vr >>= 1
|
||||
vg >>= 1
|
||||
vb >>= 1
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dr, dg, db := diff(cr, vr), diff(cg, vg), diff(cb, vb)
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ssd := (dr * dr) + (dg * dg) + (db * db)
|
||||
if ssd < bestSSD {
|
||||
bestSSD = ssd
|
||||
result = v
|
||||
}
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
// A Paletted is an in-memory image backed by a 2-D slice of uint8 values and a PalettedColorModel.
|
||||
type Paletted struct {
|
||||
// Pix holds the image's pixels. The pixel at (x, y) is Pix[y*Stride+x].
|
||||
Pix []uint8
|
||||
Stride int
|
||||
// Rect is the image's bounds.
|
||||
Rect Rectangle
|
||||
// Palette is the image's palette.
|
||||
Palette PalettedColorModel
|
||||
}
|
||||
|
||||
func (p *Paletted) ColorModel() ColorModel { return p.Palette }
|
||||
|
||||
func (p *Paletted) Bounds() Rectangle { return p.Rect }
|
||||
|
||||
func (p *Paletted) At(x, y int) Color {
|
||||
if len(p.Palette) == 0 {
|
||||
return nil
|
||||
}
|
||||
if !p.Rect.Contains(Point{x, y}) {
|
||||
return p.Palette[0]
|
||||
}
|
||||
return p.Palette[p.Pix[y*p.Stride+x]]
|
||||
}
|
||||
|
||||
func (p *Paletted) ColorIndexAt(x, y int) uint8 {
|
||||
if !p.Rect.Contains(Point{x, y}) {
|
||||
return 0
|
||||
}
|
||||
return p.Pix[y*p.Stride+x]
|
||||
}
|
||||
|
||||
func (p *Paletted) SetColorIndex(x, y int, index uint8) {
|
||||
if !p.Rect.Contains(Point{x, y}) {
|
||||
return
|
||||
}
|
||||
p.Pix[y*p.Stride+x] = index
|
||||
}
|
||||
|
||||
// Opaque scans the entire image and returns whether or not it is fully opaque.
|
||||
func (p *Paletted) Opaque() bool {
|
||||
for _, c := range p.Palette {
|
||||
_, _, _, a := c.RGBA()
|
||||
if a != 0xffff {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// NewPaletted returns a new Paletted with the given width, height and palette.
|
||||
func NewPaletted(w, h int, m PalettedColorModel) *Paletted {
|
||||
pix := make([]uint8, w*h)
|
||||
return &Paletted{pix, w, Rectangle{ZP, Point{w, h}}, m}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue