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package imaging
import (
"bytes"
"image"
"image/color"
"testing"
)
func compareNRGBA(img1, img2 *image.NRGBA, delta int) bool {
if !img1.Rect.Eq(img2.Rect) {
return false
}
if len(img1.Pix) != len(img2.Pix) {
return false
}
for i := 0; i < len(img1.Pix); i++ {
if absint(int(img1.Pix[i])-int(img2.Pix[i])) > delta {
return false
}
}
return true
}
func TestEncodeDecode(t *testing.T) {
imgWithAlpha := image.NewNRGBA(image.Rect(0, 0, 3, 3))
imgWithAlpha.Pix = []uint8{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138,
244, 245, 246, 247, 248, 249, 250, 252, 252, 253, 254, 255,
}
imgWithoutAlpha := image.NewNRGBA(image.Rect(0, 0, 3, 3))
imgWithoutAlpha.Pix = []uint8{
0, 1, 2, 255, 4, 5, 6, 255, 8, 9, 10, 255,
127, 128, 129, 255, 131, 132, 133, 255, 135, 136, 137, 255,
244, 245, 246, 255, 248, 249, 250, 255, 252, 253, 254, 255,
}
for _, format := range []Format{JPEG, PNG, GIF, BMP, TIFF} {
img := imgWithoutAlpha
if format == PNG {
img = imgWithAlpha
}
buf := &bytes.Buffer{}
err := Encode(buf, img, format)
if err != nil {
t.Errorf("fail encoding format %s", format)
continue
}
img2, err := Decode(buf)
if err != nil {
t.Errorf("fail decoding format %s", format)
continue
}
img2cloned := Clone(img2)
delta := 0
if format == JPEG {
delta = 3
} else if format == GIF {
delta = 16
}
if !compareNRGBA(img, img2cloned, delta) {
t.Errorf("test [DecodeEncode %s] failed: %#v %#v", format, img, img2cloned)
continue
}
}
buf := &bytes.Buffer{}
err := Encode(buf, imgWithAlpha, JPEG)
if err != nil {
t.Errorf("failed encoding alpha to JPEG format %s", err)
}
buf = &bytes.Buffer{}
err = Encode(buf, imgWithAlpha, Format(100))
if err != ErrUnsupportedFormat {
t.Errorf("expected ErrUnsupportedFormat")
}
buf = bytes.NewBuffer([]byte("bad data"))
_, err = Decode(buf)
if err == nil {
t.Errorf("decoding bad data, expected error")
}
}
func TestNew(t *testing.T) {
td := []struct {
desc string
w, h int
c color.Color
dstBounds image.Rectangle
dstPix []uint8
}{
{
"New 1x1 black",
1, 1,
color.NRGBA{0, 0, 0, 0},
image.Rect(0, 0, 1, 1),
[]uint8{0x00, 0x00, 0x00, 0x00},
},
{
"New 1x2 red",
1, 2,
color.NRGBA{255, 0, 0, 255},
image.Rect(0, 0, 1, 2),
[]uint8{0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff},
},
{
"New 2x1 white",
2, 1,
color.NRGBA{255, 255, 255, 255},
image.Rect(0, 0, 2, 1),
[]uint8{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
},
{
"New 0x0 white",
0, 0,
color.NRGBA{255, 255, 255, 255},
image.Rect(0, 0, 0, 0),
nil,
},
}
for _, d := range td {
got := New(d.w, d.h, d.c)
want := image.NewNRGBA(d.dstBounds)
want.Pix = d.dstPix
if !compareNRGBA(got, want, 0) {
t.Errorf("test [%s] failed: %#v", d.desc, got)
}
}
}
func TestFormats(t *testing.T) {
formatNames := map[Format]string{
JPEG: "JPEG",
PNG: "PNG",
GIF: "GIF",
BMP: "BMP",
TIFF: "TIFF",
Format(-1): "Unsupported",
}
for format, name := range formatNames {
got := format.String()
if got != name {
t.Errorf("test [Format names] failed: got %#v want %#v", got, name)
continue
}
}
}
|
