mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-19 21:02:18 +02:00
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
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// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package restorable
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import (
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"image"
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"image/color"
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"image/draw"
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"runtime"
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"github.com/hajimehoshi/ebiten/internal/math"
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)
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func CopyImage(origImg image.Image) *image.RGBA {
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size := origImg.Bounds().Size()
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w, h := size.X, size.Y
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newImg := image.NewRGBA(image.Rect(0, 0, math.NextPowerOf2Int(w), math.NextPowerOf2Int(h)))
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switch origImg := origImg.(type) {
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case *image.Paletted:
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b := origImg.Bounds()
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x0 := b.Min.X
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y0 := b.Min.Y
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x1 := b.Max.X
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y1 := b.Max.Y
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palette := make([]uint8, len(origImg.Palette)*4)
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for i, c := range origImg.Palette {
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rgba := color.RGBAModel.Convert(c).(color.RGBA)
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palette[4*i] = rgba.R
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palette[4*i+1] = rgba.G
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palette[4*i+2] = rgba.B
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palette[4*i+3] = rgba.A
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}
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index0 := 0
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index1 := 0
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d0 := origImg.Stride - (x1 - x0)
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d1 := newImg.Stride - (x1-x0)*4
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pix0 := origImg.Pix
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pix1 := newImg.Pix
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for j := 0; j < y1-y0; j++ {
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for i := 0; i < x1-x0; i++ {
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p := int(pix0[index0])
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pix1[index1] = palette[4*p]
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pix1[index1+1] = palette[4*p+1]
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pix1[index1+2] = palette[4*p+2]
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pix1[index1+3] = palette[4*p+3]
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index0++
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index1 += 4
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}
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index0 += d0
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index1 += d1
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}
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default:
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draw.Draw(newImg, image.Rect(0, 0, w, h), origImg, origImg.Bounds().Min, draw.Src)
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}
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runtime.Gosched()
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return newImg
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}
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