112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package wallpaper
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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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"image/draw"
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"image/png"
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"os"
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"testing"
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)
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func TestWallpaper(t *testing.T) {
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var testFunc = func(width, height int) {
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var (
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qWidth = width / 2
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qHeight = height / 2
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red = color.RGBA{255, 0, 0, 255}
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green = color.RGBA{0, 255, 0, 255}
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blue = color.RGBA{0, 0, 255, 255}
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pink = color.RGBA{255, 0, 255, 255}
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)
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// Create a dummy image that is width*height and has the four
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// quadrants laid out as solid colors:
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// Red | Green
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// Blue | Pink
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img := image.NewRGBA(image.Rect(0, 0, width, height))
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draw.Draw(
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// Corner: red
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img, // dst Image
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image.Rect(0, 0, qWidth, qHeight), // r Rectangle
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image.NewUniform(red), // src Image
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image.Point{0, 0}, // sp Point
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draw.Over, // op Op
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)
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draw.Draw(
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// Top: green
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img,
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image.Rect(qWidth, 0, width, qHeight),
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image.NewUniform(green),
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image.Point{qWidth, 0},
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draw.Over,
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)
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draw.Draw(
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// Left: blue
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img,
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image.Rect(0, qHeight, qWidth, height),
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image.NewUniform(blue),
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image.Point{0, qHeight},
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draw.Over,
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)
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draw.Draw(
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// Repeat: pink
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img,
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image.Rect(qWidth, qHeight, width, height),
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image.NewUniform(pink),
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image.Point{qWidth, qHeight},
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draw.Over,
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)
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// Output as png to disk if you wanna see what's in it.
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if os.Getenv("T_WALLPAPER_PNG") != "" {
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fn := fmt.Sprintf("test-%dx%d.png", width, height)
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if fh, err := os.Create(fn); err == nil {
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defer fh.Close()
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if err := png.Encode(fh, img); err != nil {
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t.Errorf("err: %s", err)
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}
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}
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}
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wp, err := FromImage(nil, img, "dummy")
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if err != nil {
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t.Errorf("Couldn't create FromImage: %s", err)
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t.FailNow()
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}
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// Check the quarter size is what we expected.
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w, h := wp.QuarterSize()
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if w != qWidth || h != qHeight {
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t.Errorf(
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"Got wrong quarter size: expected %dx%d but got %dx%d",
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qWidth, qHeight,
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w, h,
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)
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}
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// Test the colors.
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testColor := func(name string, img *image.RGBA, expect color.RGBA) {
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if actual := img.At(5, 5); actual != expect {
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t.Errorf(
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"%s: expected color %v but got %v",
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name,
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expect,
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actual,
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)
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}
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}
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testColor("Corner", wp.Corner(), red)
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testColor("Top", wp.Top(), green)
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testColor("Left", wp.Left(), blue)
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testColor("Repeat", wp.Repeat(), pink)
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}
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testFunc(128, 128)
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testFunc(128, 64)
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testFunc(64, 128)
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testFunc(12, 12)
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testFunc(57, 39)
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}
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