99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
/*
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Copyright © 2021 Zoraiz Hassan <hzoraiz8@gmail.com>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package image_conversions
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import (
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"fmt"
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"image"
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"image/color"
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"os"
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_ "image/jpeg"
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_ "image/png"
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_ "golang.org/x/image/bmp"
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_ "golang.org/x/image/webp"
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"github.com/nathan-fiscaletti/consolesize-go"
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"github.com/nfnt/resize"
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)
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// This function shrinks the passed image according to passed dimensions or terminal
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// size if none are passed. It turns each pixel into grayscale to simplify getting numeric
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// data for ASCII character comparison.
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//
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// The returned 2D uint32 slice contains each corresponding pixel's value ranging from
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// 0 to 65535.
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func ConvertToTerminalSizedSlices(img image.Image, dimensions []int) [][]uint32 {
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var terminalWidth, terminalHeight int
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var smallImg image.Image
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// Get dimensions of current terminal
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if len(dimensions) == 0 {
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terminalWidth, _ = consolesize.GetConsoleSize()
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smallImg = resize.Resize(uint(terminalWidth), 0, img, resize.Lanczos3)
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terminalHeight = smallImg.Bounds().Max.Y
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terminalHeight -= terminalHeight / 2
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smallImg = resize.Resize(uint(terminalWidth), uint(terminalHeight), img, resize.Lanczos3)
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} else {
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terminalWidth = dimensions[0]
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terminalHeight = dimensions[1]
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smallImg = resize.Resize(uint(terminalWidth), uint(terminalHeight), img, resize.Lanczos3)
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}
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if len(dimensions) > 0 {
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defaultTermWidth, _ := consolesize.GetConsoleSize()
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defaultTermWidth -= 1
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if dimensions[0] > defaultTermWidth {
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fmt.Println("Error: Set width is larger than terminal width")
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os.Exit(1)
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}
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}
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// initialize imgSet 2D slice
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imgSet := make([][]uint32, terminalHeight)
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for i := range imgSet {
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imgSet[i] = make([]uint32, terminalWidth)
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}
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// smallImg := resize.Resize(uint(terminalWidth), 0, img, resize.Lanczos3)
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b := smallImg.Bounds()
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for y := b.Min.Y; y < b.Max.Y; y++ {
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var temp []uint32
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for x := b.Min.X; x < b.Max.X; x++ {
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oldPixel := smallImg.At(x, y)
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pixel := color.GrayModel.Convert(oldPixel)
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// We only need Red from Red, Green, Blue since they have the same value for grayscale images
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r, _, _, _ := pixel.RGBA()
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temp = append(temp, r)
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}
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imgSet[y] = temp
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}
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return imgSet
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}
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