common/imageutil/asciiraster_test.go

package imageutil

import (
	"bytes"
	"encoding/base64"
	"image"
	"io/ioutil"
	"log"
	"os"
	"strings"
	"testing"

	"devt.de/krotik/common/fileutil"
)

import (
	"image/color"
	"image/jpeg"
	"image/png"
)

func TestRenderSymbols(t *testing.T) {

	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))

	m, err := jpeg.Decode(reader)
	if err != nil {
		log.Fatal(err)
	}

	imageFile := "test.png"

	if res, _ := fileutil.PathExists(imageFile); res {
		os.Remove(imageFile)
	}

	colBlack := color.RGBA{0, 0, 0, 255}

	_, err = RenderSymbols(m, image.Point{5, 2}, "c", colBlack,
		testCharMap)

	if err.Error() != "Cannot find mapping for rune: 'c'" {
		t.Error("Unexpected error response: ", err)
		return
	}

	m, err = RenderSymbols(m, image.Point{5, 2}, "aba a", colBlack,
		testCharMap)
	if err != nil {
		t.Error(err)
		return
	}

	// Check that at least some pixels were set correctly

	if m.At(7, 2) == colBlack {
		t.Error("Expected color was not found")
	}
	if m.At(8, 2) != colBlack {
		t.Error("Expected color was not found")
	}
	if m.At(13, 5) != colBlack {
		t.Error("Expected color was not found")
	}
	if m.At(14, 5) == colBlack {
		t.Error("Expected color was not found")
	}

	var buf bytes.Buffer

	png.Encode(&buf, m)

	ioutil.WriteFile(imageFile, buf.Bytes(), 0644)

	if res, _ := fileutil.PathExists(imageFile); res {
		os.Remove(imageFile)
	} else {
		t.Error("Expected image file did not exist")
	}
}

// Test character

var testCharMap = map[rune]string{

	'a': `
   ****
 **    **
 ********
 **    **
 **    **
`[1:],

	'b': `
 ******
 **    *
 ******
 **    *
 ******
`[1:],
}

// Test image

const data = `
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Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2P/wAARCABnAJYDASIAAhEBAxEB/8QA
HwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIh
MUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVW
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x8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQF
BgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAV
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hYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq
8vP09fb3+Pn6/9oADAMBAAIRAxEAPwDlwKMD0pwzSiuK57QzGDxS7D6in8Y5ximnAPUfSlcq4m3ilUYp
2OKXHvRcVxnTtS7c07HNFK4DQPakC4PNOA+tOx70XAjK/So5gBGP94fzqfvUVx/qxx/EP51UXqRP4WSE
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kMPUVBjjtTGtRu0Zopw+lFFxhinrGzuqqMsxAA9yaXFSRv5cqSEcIwYj6GpuZ30O30fSLKzhUpbpNMv3
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`