mirror of
https://github.com/golang/go
synced 2024-11-13 18:20:32 -07:00
image: replace Width and Height by Bounds, and introduce the Point and
Rect types.
The actual image representation is unchanged. A future change will
replace the {[][]color} with {[]color, stride int, r Rectangle} and
possibly a clip region.
The draw.Color, draw.Point and draw.Rect types will be removed in a
future change. Trying to do it in this one polluted the diff with
trivia.
R=r, rsc
CC=golang-dev
https://golang.org/cl/1918047
This commit is contained in:
Nigel Tao
parent
46db2e3c25
commit
5eb35e4247
@ -669,7 +669,7 @@ func redraw(new bool) {
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// if new && getwindow(display, Refmesg) < 0 {
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// sysfatal("can't reattach to window");
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// }
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r := draw.Rect(0, 0, screen.Width(), screen.Height())
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r := draw.Rect(screen.Bounds().MinX, screen.Bounds().Min.Y, screen, Bounds().Max.X, screen.Bounds().Max.Y)
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pos.X = (pos.X - rboard.Min.X) / pcsz
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pos.Y = (pos.Y - rboard.Min.Y) / pcsz
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dx := r.Max.X - r.Min.X
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@ -722,7 +722,7 @@ func quitter(c <-chan bool) {
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func Play(pp []Piece, ctxt draw.Context) {
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display = ctxt
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screen = ctxt.Screen()
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screenr = draw.Rect(0, 0, screen.Width(), screen.Height())
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screenr = draw.Rect(screen.Bounds().MinX, screen.Bounds().Min.Y, screen, Bounds().Max.X, screen.Bounds().Max.Y)
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pieces = pp
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N = len(pieces[0].d)
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initPieces()
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@ -88,9 +88,7 @@ func (c Color) SetAlpha(a uint8) Color {
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return r<<24 | g<<16 | b<<8 | Color(a)
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}
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func (c Color) Width() int { return 1e9 }
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func (c Color) Height() int { return 1e9 }
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func (c Color) Bounds() image.Rectangle { return image.Rect(0, 0, 1e9, 1e9) }
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func (c Color) At(x, y int) image.Color { return c }
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@ -43,13 +43,15 @@ func Draw(dst Image, r Rectangle, src image.Image, sp Point) {
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// The implementation is simple and slow.
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// TODO(nigeltao): Optimize this.
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func DrawMask(dst Image, r Rectangle, src image.Image, sp Point, mask image.Image, mp Point, op Op) {
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dx, dy := src.Width()-sp.X, src.Height()-sp.Y
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sb := src.Bounds()
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dx, dy := sb.Dx()-sp.X, sb.Dy()-sp.Y
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if mask != nil {
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if dx > mask.Width()-mp.X {
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dx = mask.Width() - mp.X
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mb := mask.Bounds()
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if dx > mb.Dx()-mp.X {
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dx = mb.Dx() - mp.X
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}
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if dy > mask.Height()-mp.Y {
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dy = mask.Height() - mp.Y
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if dy > mb.Dy()-mp.Y {
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dy = mb.Dy() - mp.Y
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}
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}
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if r.Dx() > dx {
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@ -97,10 +97,11 @@ var drawTests = []drawTest{
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func makeGolden(dst image.Image, t drawTest) image.Image {
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// Since golden is a newly allocated image, we don't have to check if the
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// input source and mask images and the output golden image overlap.
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golden := image.NewRGBA(dst.Width(), dst.Height())
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for y := 0; y < golden.Height(); y++ {
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b := dst.Bounds()
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golden := image.NewRGBA(b.Dx(), b.Dy())
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for y := b.Min.Y; y < b.Max.Y; y++ {
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my, sy := y, y
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for x := 0; x < golden.Width(); x++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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mx, sx := x, x
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const M = 1<<16 - 1
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var dr, dg, db, da uint32
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@ -129,9 +130,14 @@ loop:
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for _, test := range drawTests {
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dst := hgradRed(255)
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// Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation.
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b := dst.Bounds()
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golden := makeGolden(dst, test)
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if !b.Eq(golden.Bounds()) {
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t.Errorf("draw %s: bounds %v versus %v", test.desc, dst.Bounds(), golden.Bounds())
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continue
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}
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// Draw the same combination onto the actual dst using the optimized DrawMask implementation.
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DrawMask(dst, Rect(0, 0, dst.Width(), dst.Height()), test.src, ZP, test.mask, ZP, test.op)
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DrawMask(dst, Rect(b.Min.X, b.Min.Y, b.Max.X, b.Max.Y), test.src, ZP, test.mask, ZP, test.op)
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// Check that the resultant pixel at (8, 8) matches what we expect
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// (the expected value can be verified by hand).
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if !eq(dst.At(8, 8), test.expected) {
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@ -139,8 +145,8 @@ loop:
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continue
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}
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// Check that the resultant dst image matches the golden output.
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for y := 0; y < golden.Height(); y++ {
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for x := 0; x < golden.Width(); x++ {
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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if !eq(dst.At(x, y), golden.At(x, y)) {
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t.Errorf("draw %s: at (%d, %d), %v versus golden %v", test.desc, x, y, dst.At(x, y), golden.At(x, y))
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continue loop
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@ -67,14 +67,17 @@ func (c *conn) flusher() {
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return
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}
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b := c.img.Bounds()
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if b.Empty() {
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continue
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}
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// Each X request has a 16-bit length (in terms of 4-byte units). To avoid going over
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// this limit, we send PutImage for each row of the image, rather than trying to paint
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// the entire image in one X request. This approach could easily be optimized (or the
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// X protocol may have an escape sequence to delimit very large requests).
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// TODO(nigeltao): See what XCB's xcb_put_image does in this situation.
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w, h := c.img.Width(), c.img.Height()
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units := 6 + w
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if units > 0xffff || h > 0xffff {
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units := 6 + b.Dx()
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if units > 0xffff || b.Dy() > 0xffff {
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// This window is too large for X.
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close(c.flush)
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return
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@ -86,10 +89,10 @@ func (c *conn) flusher() {
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c.flushBuf0[3] = uint8(units >> 8)
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setU32LE(c.flushBuf0[4:8], uint32(c.window))
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setU32LE(c.flushBuf0[8:12], uint32(c.gc))
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setU32LE(c.flushBuf0[12:16], 1<<16|uint32(w))
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setU32LE(c.flushBuf0[12:16], 1<<16|uint32(b.Dx()))
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c.flushBuf0[21] = 0x18 // depth = 24 bits.
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for y := 0; y < h; y++ {
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for y := b.Min.Y; y < b.Max.Y; y++ {
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setU32LE(c.flushBuf0[16:20], uint32(y<<16))
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_, err := c.w.Write(c.flushBuf0[0:24])
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if err != nil {
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@ -97,8 +100,8 @@ func (c *conn) flusher() {
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return
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}
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p := c.img.Pixel[y]
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for x := 0; x < w; {
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nx := w - x
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for x := b.Min.X; x < b.Max.X; {
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nx := b.Max.X - x
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if nx > len(c.flushBuf1)/4 {
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nx = len(c.flushBuf1) / 4
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}
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@ -24,15 +24,13 @@ var _ image.Image = (*Image)(nil)
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func (m *Image) ColorModel() image.ColorModel { return ColorModel }
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func (m *Image) Width() int {
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func (m *Image) Bounds() image.Rectangle {
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if len(m.Pixel) == 0 {
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return 0
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return image.ZR
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}
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return len(m.Pixel[0])
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return image.Rectangle{image.ZP, image.Point{len(m.Pixel[0]), len(m.Pixel)}}
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}
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func (m *Image) Height() int { return len(m.Pixel) }
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func (m *Image) At(x, y int) image.Color { return m.Pixel[y][x] }
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func (m *Image) Set(x, y int, color image.Color) {
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@ -99,8 +99,8 @@ func (m *SpacewarPDP1) Init(ctxt draw.Context) {
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m.ctxt = ctxt
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m.kc = ctxt.KeyboardChan()
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m.screen = ctxt.Screen()
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m.dx = m.screen.Width()
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m.dy = m.screen.Height()
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m.dx = m.screen.Bounds().Dx()
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m.dy = m.screen.Bounds().Dy()
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m.colorModel = m.screen.ColorModel()
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m.pix = make([][]uint8, m.dy)
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for i := range m.pix {
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@ -8,6 +8,7 @@ TARG=image
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GOFILES=\
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color.go\
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format.go\
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geom.go\
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image.go\
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names.go\
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125
src/pkg/image/geom.go
Normal file
125
src/pkg/image/geom.go
Normal file
@ -0,0 +1,125 @@
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// Copyright 2010 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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package image
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import (
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"strconv"
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)
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// A Point is an X, Y coordinate pair. The axes increase right and down.
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type Point struct {
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X, Y int
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}
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// String returns a string representation of p like "(3,4)".
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func (p Point) String() string {
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return "(" + strconv.Itoa(p.X) + "," + strconv.Itoa(p.Y) + ")"
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}
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// Add returns the vector p+q.
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func (p Point) Add(q Point) Point {
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return Point{p.X + q.X, p.Y + q.Y}
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}
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// Sub returns the vector p-q.
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func (p Point) Sub(q Point) Point {
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return Point{p.X - q.X, p.Y - q.Y}
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}
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// ZP is the zero Point.
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var ZP Point
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// Pt is shorthand for Point{X, Y}.
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func Pt(X, Y int) Point {
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return Point{X, Y}
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}
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// A Rectangle contains the points with Min.X <= X < Max.X, Min.Y <= Y < Max.Y.
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type Rectangle struct {
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Min, Max Point
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}
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// String returns a string representation of r like "(3,4)-(6,5)".
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func (r Rectangle) String() string {
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return r.Min.String() + "-" + r.Max.String()
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}
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// Dx returns r's width.
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func (r Rectangle) Dx() int {
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return r.Max.X - r.Min.X
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}
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// Dy returns r's height.
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func (r Rectangle) Dy() int {
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return r.Max.Y - r.Min.Y
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}
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// Add returns the rectangle r translated by p.
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func (r Rectangle) Add(p Point) Rectangle {
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return Rectangle{
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Point{r.Min.X + p.X, r.Min.Y + p.Y},
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Point{r.Max.X + p.X, r.Max.Y + p.Y},
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}
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}
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// Add returns the rectangle r translated by -p.
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func (r Rectangle) Sub(p Point) Rectangle {
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return Rectangle{
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Point{r.Min.X - p.X, r.Min.Y - p.Y},
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Point{r.Max.X - p.X, r.Max.Y - p.Y},
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}
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}
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// Inset returns the rectangle r inset by n, which may be negative.
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func (r Rectangle) Inset(n int) Rectangle {
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return Rectangle{
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Point{r.Min.X + n, r.Min.Y + n},
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Point{r.Max.X - n, r.Max.Y - n},
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}
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}
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// Empty returns whether the rectangle contains no points.
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func (r Rectangle) Empty() bool {
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return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
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}
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// Eq returns whether r and s are equal.
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func (r Rectangle) Eq(s Rectangle) bool {
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return r.Min.X == s.Min.X && r.Min.Y == s.Min.Y &&
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r.Max.X == s.Max.X && r.Max.Y == s.Max.Y
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}
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// Overlaps returns whether r and s have a non-empty intersection.
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func (r Rectangle) Overlaps(s Rectangle) bool {
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return r.Min.X < s.Max.X && s.Min.X < r.Max.X &&
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r.Min.Y < s.Max.Y && s.Min.Y < r.Max.Y
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}
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// Canon returns the canonical version of r. The returned rectangle has
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// minimum and maximum coordinates swapped if necessary so that Min.X <= Max.X
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// and Min.Y <= Max.Y.
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func (r Rectangle) Canon() Rectangle {
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if r.Max.X < r.Min.X {
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r.Min.X, r.Max.X = r.Max.X, r.Min.X
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}
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if r.Max.Y < r.Min.Y {
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r.Min.Y, r.Max.Y = r.Max.Y, r.Min.Y
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}
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return r
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}
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// ZR is the zero Rectangle.
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var ZR Rectangle
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// Rect is shorthand for Rectangle{Pt(x0, y0), Pt(x1, y1)}.
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func Rect(x0, y0, x1, y1 int) Rectangle {
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if x0 > x1 {
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x0, x1 = x1, x0
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}
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if y0 > y1 {
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y0, y1 = y1, y0
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}
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return Rectangle{Point{x0, y0}, Point{x1, y1}}
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}
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@ -5,13 +5,16 @@
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// The image package implements a basic 2-D image library.
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package image
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// An Image is a rectangular grid of Colors drawn from a ColorModel.
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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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Width() int
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Height() int
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// At(0, 0) returns the upper-left pixel of the grid.
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// At(Width()-1, Height()-1) returns the lower-right pixel.
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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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@ -23,18 +26,24 @@ type RGBA struct {
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func (p *RGBA) ColorModel() ColorModel { return RGBAColorModel }
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func (p *RGBA) Width() int {
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func (p *RGBA) Bounds() Rectangle {
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if len(p.Pixel) == 0 {
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return 0
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return ZR
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}
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return len(p.Pixel[0])
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return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
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}
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func (p *RGBA) Height() int { return len(p.Pixel) }
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func (p *RGBA) At(x, y int) Color {
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// TODO(nigeltao): Check if (x,y) is outside the bounds, and return zero.
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// Similarly for the other concrete image types.
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return p.Pixel[y][x]
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}
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func (p *RGBA) At(x, y int) Color { return p.Pixel[y][x] }
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func (p *RGBA) Set(x, y int, c Color) { p.Pixel[y][x] = toRGBAColor(c).(RGBAColor) }
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func (p *RGBA) Set(x, y int, c Color) {
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// TODO(nigeltao): Check if (x,y) is outside the bounds, and return.
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// Similarly for the other concrete image types.
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p.Pixel[y][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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@ -71,15 +80,13 @@ type RGBA64 struct {
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func (p *RGBA64) ColorModel() ColorModel { return RGBA64ColorModel }
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func (p *RGBA64) Width() int {
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func (p *RGBA64) Bounds() Rectangle {
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if len(p.Pixel) == 0 {
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return 0
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return ZR
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}
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return len(p.Pixel[0])
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return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
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}
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func (p *RGBA64) Height() int { return len(p.Pixel) }
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func (p *RGBA64) At(x, y int) Color { return p.Pixel[y][x] }
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func (p *RGBA64) Set(x, y int, c Color) { p.Pixel[y][x] = toRGBA64Color(c).(RGBA64Color) }
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@ -119,15 +126,13 @@ type NRGBA struct {
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func (p *NRGBA) ColorModel() ColorModel { return NRGBAColorModel }
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func (p *NRGBA) Width() int {
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func (p *NRGBA) Bounds() Rectangle {
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if len(p.Pixel) == 0 {
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return 0
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return ZR
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}
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return len(p.Pixel[0])
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return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
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}
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func (p *NRGBA) Height() int { return len(p.Pixel) }
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func (p *NRGBA) At(x, y int) Color { return p.Pixel[y][x] }
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func (p *NRGBA) Set(x, y int, c Color) { p.Pixel[y][x] = toNRGBAColor(c).(NRGBAColor) }
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@ -167,15 +172,13 @@ type NRGBA64 struct {
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func (p *NRGBA64) ColorModel() ColorModel { return NRGBA64ColorModel }
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func (p *NRGBA64) Width() int {
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func (p *NRGBA64) Bounds() Rectangle {
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if len(p.Pixel) == 0 {
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return 0
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return ZR
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}
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return len(p.Pixel[0])
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return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *NRGBA64) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *NRGBA64) At(x, y int) Color { return p.Pixel[y][x] }
|
||||
|
||||
func (p *NRGBA64) Set(x, y int, c Color) { p.Pixel[y][x] = toNRGBA64Color(c).(NRGBA64Color) }
|
||||
@ -215,15 +218,13 @@ type Alpha struct {
|
||||
|
||||
func (p *Alpha) ColorModel() ColorModel { return AlphaColorModel }
|
||||
|
||||
func (p *Alpha) Width() int {
|
||||
func (p *Alpha) Bounds() Rectangle {
|
||||
if len(p.Pixel) == 0 {
|
||||
return 0
|
||||
return ZR
|
||||
}
|
||||
return len(p.Pixel[0])
|
||||
return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *Alpha) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *Alpha) At(x, y int) Color { return p.Pixel[y][x] }
|
||||
|
||||
func (p *Alpha) Set(x, y int, c Color) { p.Pixel[y][x] = toAlphaColor(c).(AlphaColor) }
|
||||
@ -263,15 +264,13 @@ type Alpha16 struct {
|
||||
|
||||
func (p *Alpha16) ColorModel() ColorModel { return Alpha16ColorModel }
|
||||
|
||||
func (p *Alpha16) Width() int {
|
||||
func (p *Alpha16) Bounds() Rectangle {
|
||||
if len(p.Pixel) == 0 {
|
||||
return 0
|
||||
return ZR
|
||||
}
|
||||
return len(p.Pixel[0])
|
||||
return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *Alpha16) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *Alpha16) At(x, y int) Color { return p.Pixel[y][x] }
|
||||
|
||||
func (p *Alpha16) Set(x, y int, c Color) { p.Pixel[y][x] = toAlpha16Color(c).(Alpha16Color) }
|
||||
@ -311,15 +310,13 @@ type Gray struct {
|
||||
|
||||
func (p *Gray) ColorModel() ColorModel { return GrayColorModel }
|
||||
|
||||
func (p *Gray) Width() int {
|
||||
func (p *Gray) Bounds() Rectangle {
|
||||
if len(p.Pixel) == 0 {
|
||||
return 0
|
||||
return ZR
|
||||
}
|
||||
return len(p.Pixel[0])
|
||||
return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *Gray) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *Gray) At(x, y int) Color { return p.Pixel[y][x] }
|
||||
|
||||
func (p *Gray) Set(x, y int, c Color) { p.Pixel[y][x] = toGrayColor(c).(GrayColor) }
|
||||
@ -347,15 +344,13 @@ type Gray16 struct {
|
||||
|
||||
func (p *Gray16) ColorModel() ColorModel { return Gray16ColorModel }
|
||||
|
||||
func (p *Gray16) Width() int {
|
||||
func (p *Gray16) Bounds() Rectangle {
|
||||
if len(p.Pixel) == 0 {
|
||||
return 0
|
||||
return ZR
|
||||
}
|
||||
return len(p.Pixel[0])
|
||||
return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *Gray16) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *Gray16) At(x, y int) Color { return p.Pixel[y][x] }
|
||||
|
||||
func (p *Gray16) Set(x, y int, c Color) { p.Pixel[y][x] = toGray16Color(c).(Gray16Color) }
|
||||
@ -421,15 +416,13 @@ type Paletted struct {
|
||||
|
||||
func (p *Paletted) ColorModel() ColorModel { return p.Palette }
|
||||
|
||||
func (p *Paletted) Width() int {
|
||||
func (p *Paletted) Bounds() Rectangle {
|
||||
if len(p.Pixel) == 0 {
|
||||
return 0
|
||||
return ZR
|
||||
}
|
||||
return len(p.Pixel[0])
|
||||
return Rectangle{ZP, Point{len(p.Pixel[0]), len(p.Pixel)}}
|
||||
}
|
||||
|
||||
func (p *Paletted) Height() int { return len(p.Pixel) }
|
||||
|
||||
func (p *Paletted) At(x, y int) Color { return p.Palette[p.Pixel[y][x]] }
|
||||
|
||||
func (p *Paletted) ColorIndexAt(x, y int) uint8 {
|
||||
|
||||
@ -25,9 +25,7 @@ func (c ColorImage) ColorModel() ColorModel {
|
||||
return ColorModelFunc(func(Color) Color { return c.C })
|
||||
}
|
||||
|
||||
func (c ColorImage) Width() int { return 1e9 }
|
||||
|
||||
func (c ColorImage) Height() int { return 1e9 }
|
||||
func (c ColorImage) Bounds() Rectangle { return Rectangle{ZP, Point{1e9, 1e9}} }
|
||||
|
||||
func (c ColorImage) At(x, y int) Color { return c.C }
|
||||
|
||||
|
||||
@ -45,12 +45,13 @@ func readPng(filename string) (image.Image, os.Error) {
|
||||
// An approximation of the sng command-line tool.
|
||||
func sng(w io.WriteCloser, filename string, png image.Image) {
|
||||
defer w.Close()
|
||||
bounds := png.Bounds()
|
||||
// For now, the go PNG parser only reads bitdepths of 8.
|
||||
bitdepth := 8
|
||||
|
||||
// Write the filename and IHDR.
|
||||
io.WriteString(w, "#SNG: from "+filename+".png\nIHDR {\n")
|
||||
fmt.Fprintf(w, " width: %d; height: %d; bitdepth: %d;\n", png.Width(), png.Height(), bitdepth)
|
||||
fmt.Fprintf(w, " width: %d; height: %d; bitdepth: %d;\n", bounds.Dx(), bounds.Dy(), bitdepth)
|
||||
cm := png.ColorModel()
|
||||
var paletted *image.Paletted
|
||||
cpm, _ := cm.(image.PalettedColorModel)
|
||||
@ -86,20 +87,20 @@ func sng(w io.WriteCloser, filename string, png image.Image) {
|
||||
|
||||
// Write the IMAGE.
|
||||
io.WriteString(w, "IMAGE {\n pixels hex\n")
|
||||
for y := 0; y < png.Height(); y++ {
|
||||
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
|
||||
switch {
|
||||
case cm == image.RGBAColorModel:
|
||||
for x := 0; x < png.Width(); x++ {
|
||||
for x := bounds.Min.X; x < bounds.Max.X; x++ {
|
||||
rgba := png.At(x, y).(image.RGBAColor)
|
||||
fmt.Fprintf(w, "%02x%02x%02x ", rgba.R, rgba.G, rgba.B)
|
||||
}
|
||||
case cm == image.NRGBAColorModel:
|
||||
for x := 0; x < png.Width(); x++ {
|
||||
for x := bounds.Min.X; x < bounds.Max.X; x++ {
|
||||
nrgba := png.At(x, y).(image.NRGBAColor)
|
||||
fmt.Fprintf(w, "%02x%02x%02x%02x ", nrgba.R, nrgba.G, nrgba.B, nrgba.A)
|
||||
}
|
||||
case cpm != nil:
|
||||
for x := 0; x < png.Width(); x++ {
|
||||
for x := bounds.Min.X; x < bounds.Max.X; x++ {
|
||||
fmt.Fprintf(w, "%02x", paletted.ColorIndexAt(x, y))
|
||||
}
|
||||
}
|
||||
|
||||
@ -41,8 +41,9 @@ func opaque(m image.Image) bool {
|
||||
if o, ok := m.(opaquer); ok {
|
||||
return o.Opaque()
|
||||
}
|
||||
for y := 0; y < m.Height(); y++ {
|
||||
for x := 0; x < m.Width(); x++ {
|
||||
b := m.Bounds()
|
||||
for y := b.Min.Y; y < b.Max.Y; y++ {
|
||||
for x := b.Min.X; x < b.Max.X; x++ {
|
||||
_, _, _, a := m.At(x, y).RGBA()
|
||||
if a != 0xffff {
|
||||
return false
|
||||
@ -91,8 +92,9 @@ func (e *encoder) writeChunk(b []byte, name string) {
|
||||
}
|
||||
|
||||
func (e *encoder) writeIHDR() {
|
||||
writeUint32(e.tmp[0:4], uint32(e.m.Width()))
|
||||
writeUint32(e.tmp[4:8], uint32(e.m.Height()))
|
||||
b := e.m.Bounds()
|
||||
writeUint32(e.tmp[0:4], uint32(b.Dx()))
|
||||
writeUint32(e.tmp[4:8], uint32(b.Dy()))
|
||||
e.tmp[8] = 8 // bit depth
|
||||
e.tmp[9] = e.colorType
|
||||
e.tmp[10] = 0 // default compression method
|
||||
@ -254,18 +256,19 @@ func writeImage(w io.Writer, m image.Image, ct uint8) os.Error {
|
||||
// cr[ft], for non-zero filter types ft, are buffers for transforming cr[0] under the
|
||||
// other PNG filter types. These buffers are allocated once and re-used for each row.
|
||||
// The +1 is for the per-row filter type, which is at cr[*][0].
|
||||
b := m.Bounds()
|
||||
var cr [nFilter][]uint8
|
||||
for i := 0; i < len(cr); i++ {
|
||||
cr[i] = make([]uint8, 1+bpp*m.Width())
|
||||
cr[i] = make([]uint8, 1+bpp*b.Dx())
|
||||
cr[i][0] = uint8(i)
|
||||
}
|
||||
pr := make([]uint8, 1+bpp*m.Width())
|
||||
pr := make([]uint8, 1+bpp*b.Dx())
|
||||
|
||||
for y := 0; y < m.Height(); y++ {
|
||||
for y := b.Min.Y; y < b.Max.Y; y++ {
|
||||
// Convert from colors to bytes.
|
||||
switch ct {
|
||||
case ctTrueColor:
|
||||
for x := 0; x < m.Width(); x++ {
|
||||
for x := b.Min.X; x < b.Max.X; x++ {
|
||||
// We have previously verified that the alpha value is fully opaque.
|
||||
r, g, b, _ := m.At(x, y).RGBA()
|
||||
cr[0][3*x+1] = uint8(r >> 8)
|
||||
@ -273,12 +276,12 @@ func writeImage(w io.Writer, m image.Image, ct uint8) os.Error {
|
||||
cr[0][3*x+3] = uint8(b >> 8)
|
||||
}
|
||||
case ctPaletted:
|
||||
for x := 0; x < m.Width(); x++ {
|
||||
for x := b.Min.X; x < b.Max.X; x++ {
|
||||
cr[0][x+1] = paletted.ColorIndexAt(x, y)
|
||||
}
|
||||
case ctTrueColorAlpha:
|
||||
// Convert from image.Image (which is alpha-premultiplied) to PNG's non-alpha-premultiplied.
|
||||
for x := 0; x < m.Width(); x++ {
|
||||
for x := b.Min.X; x < b.Max.X; x++ {
|
||||
c := image.NRGBAColorModel.Convert(m.At(x, y)).(image.NRGBAColor)
|
||||
cr[0][4*x+1] = c.R
|
||||
cr[0][4*x+2] = c.G
|
||||
@ -327,7 +330,7 @@ func Encode(w io.Writer, m image.Image) os.Error {
|
||||
// Obviously, negative widths and heights are invalid. Furthermore, the PNG
|
||||
// spec section 11.2.2 says that zero is invalid. Excessively large images are
|
||||
// also rejected.
|
||||
mw, mh := int64(m.Width()), int64(m.Height())
|
||||
mw, mh := int64(m.Bounds().Dx()), int64(m.Bounds().Dy())
|
||||
if mw <= 0 || mh <= 0 || mw >= 1<<32 || mh >= 1<<32 {
|
||||
return FormatError("invalid image size: " + strconv.Itoa64(mw) + "x" + strconv.Itoa64(mw))
|
||||
}
|
||||
|
||||
@ -13,11 +13,12 @@ import (
|
||||
)
|
||||
|
||||
func diff(m0, m1 image.Image) os.Error {
|
||||
if m0.Width() != m1.Width() || m0.Height() != m1.Height() {
|
||||
return os.NewError(fmt.Sprintf("dimensions differ: %dx%d vs %dx%d", m0.Width(), m0.Height(), m1.Width(), m1.Height()))
|
||||
b0, b1 := m0.Bounds(), m1.Bounds()
|
||||
if !b0.Eq(b1) {
|
||||
return os.NewError(fmt.Sprintf("dimensions differ: %v vs %v", b0, b1))
|
||||
}
|
||||
for y := 0; y < m0.Height(); y++ {
|
||||
for x := 0; x < m0.Width(); x++ {
|
||||
for y := b0.Min.Y; y < b0.Max.Y; y++ {
|
||||
for x := b0.Min.X; x < b0.Max.X; x++ {
|
||||
r0, g0, b0, a0 := m0.At(x, y).RGBA()
|
||||
r1, g1, b1, a1 := m1.At(x, y).RGBA()
|
||||
if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user