From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/go/image%2Fpng%2Findex.html | 104 ------------------------------------ 1 file changed, 104 deletions(-) delete mode 100644 devdocs/go/image%2Fpng%2Findex.html (limited to 'devdocs/go/image%2Fpng%2Findex.html') diff --git a/devdocs/go/image%2Fpng%2Findex.html b/devdocs/go/image%2Fpng%2Findex.html deleted file mode 100644 index 81d127b6..00000000 --- a/devdocs/go/image%2Fpng%2Findex.html +++ /dev/null @@ -1,104 +0,0 @@ -

Package png

Overview

Package png implements a PNG image decoder and encoder.

-

The PNG specification is at https://www.w3.org/TR/PNG/.

Index

Examples

Decode
Encode

Package files

paeth.go reader.go writer.go

func Decode 

func Decode(r io.Reader) (image.Image, error)

Decode reads a PNG image from r and returns it as an image.Image. The type of Image returned depends on the PNG contents.

Example -

Code:

-// This example uses png.Decode which can only decode PNG images.
-// Consider using the general image.Decode as it can sniff and decode any registered image format.
-img, err := png.Decode(gopherPNG())
-if err != nil {
-    log.Fatal(err)
-}
-
-levels := []string{" ", "░", "▒", "▓", "█"}
-
-for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
-    for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
-        c := color.GrayModel.Convert(img.At(x, y)).(color.Gray)
-        level := c.Y / 51 // 51 * 5 = 255
-        if level == 5 {
-            level--
-        }
-        fmt.Print(levels[level])
-    }
-    fmt.Print("\n")
-}
-

func DecodeConfig 

func DecodeConfig(r io.Reader) (image.Config, error)

DecodeConfig returns the color model and dimensions of a PNG image without decoding the entire image.

-

func Encode 

func Encode(w io.Writer, m image.Image) error

Encode writes the Image m to w in PNG format. Any Image may be encoded, but images that are not image.NRGBA might be encoded lossily.

Example -

Code:

-const width, height = 256, 256
-
-// Create a colored image of the given width and height.
-img := image.NewNRGBA(image.Rect(0, 0, width, height))
-
-for y := 0; y < height; y++ {
-    for x := 0; x < width; x++ {
-        img.Set(x, y, color.NRGBA{
-            R: uint8((x + y) & 255),
-            G: uint8((x + y) << 1 & 255),
-            B: uint8((x + y) << 2 & 255),
-            A: 255,
-        })
-    }
-}
-
-f, err := os.Create("image.png")
-if err != nil {
-    log.Fatal(err)
-}
-
-if err := png.Encode(f, img); err != nil {
-    f.Close()
-    log.Fatal(err)
-}
-
-if err := f.Close(); err != nil {
-    log.Fatal(err)
-}
-

type CompressionLevel 1.4

CompressionLevel indicates the compression level.

-
type CompressionLevel int
const (
-    DefaultCompression CompressionLevel = 0
-    NoCompression      CompressionLevel = -1
-    BestSpeed          CompressionLevel = -2
-    BestCompression    CompressionLevel = -3
-)

type Encoder 1.4

Encoder configures encoding PNG images.

-
type Encoder struct {
-    CompressionLevel CompressionLevel
-
-    // BufferPool optionally specifies a buffer pool to get temporary
-    // EncoderBuffers when encoding an image.
-    BufferPool EncoderBufferPool // Go 1.9
-}
-

func (*Encoder) Encode 1.4 

func (enc *Encoder) Encode(w io.Writer, m image.Image) error

Encode writes the Image m to w in PNG format.

-

type EncoderBuffer 1.9

EncoderBuffer holds the buffers used for encoding PNG images.

-
type EncoderBuffer encoder

type EncoderBufferPool 1.9

EncoderBufferPool is an interface for getting and returning temporary instances of the EncoderBuffer struct. This can be used to reuse buffers when encoding multiple images.

-
type EncoderBufferPool interface {
-    Get() *EncoderBuffer
-    Put(*EncoderBuffer)
-}

type FormatError

A FormatError reports that the input is not a valid PNG.

-
type FormatError string

func (FormatError) Error 

func (e FormatError) Error() string

type UnsupportedError

An UnsupportedError reports that the input uses a valid but unimplemented PNG feature.

-
type UnsupportedError string

func (UnsupportedError) Error 

func (e UnsupportedError) Error() string
-

- © Google, Inc.
Licensed under the Creative Commons Attribution License 3.0.
- http://golang.org/pkg/image/png/ -

-
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