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|
package kitty
import (
"bytes"
"compress/zlib"
"image"
"image/color"
"image/png"
"reflect"
"testing"
)
func TestDecoder_Decode(t *testing.T) {
// Helper function to create compressed data
compress := func(data []byte) []byte {
var buf bytes.Buffer
w := zlib.NewWriter(&buf)
w.Write(data)
w.Close()
return buf.Bytes()
}
tests := []struct {
name string
decoder Decoder
input []byte
want image.Image
wantErr bool
}{
{
name: "RGBA format 2x2",
decoder: Decoder{
Format: RGBA,
Width: 2,
Height: 2,
},
input: []byte{
255, 0, 0, 255, // Red pixel
0, 0, 255, 255, // Blue pixel
0, 0, 255, 255, // Blue pixel
255, 0, 0, 255, // Red pixel
},
want: func() image.Image {
img := image.NewRGBA(image.Rect(0, 0, 2, 2))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
img.Set(1, 0, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(0, 1, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(1, 1, color.RGBA{R: 255, G: 0, B: 0, A: 255})
return img
}(),
wantErr: false,
},
{
name: "RGB format 2x2",
decoder: Decoder{
Format: RGB,
Width: 2,
Height: 2,
},
input: []byte{
255, 0, 0, // Red pixel
0, 0, 255, // Blue pixel
0, 0, 255, // Blue pixel
255, 0, 0, // Red pixel
},
want: func() image.Image {
img := image.NewRGBA(image.Rect(0, 0, 2, 2))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
img.Set(1, 0, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(0, 1, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(1, 1, color.RGBA{R: 255, G: 0, B: 0, A: 255})
return img
}(),
wantErr: false,
},
{
name: "RGBA with compression",
decoder: Decoder{
Format: RGBA,
Width: 2,
Height: 2,
Decompress: true,
},
input: compress([]byte{
255, 0, 0, 255,
0, 0, 255, 255,
0, 0, 255, 255,
255, 0, 0, 255,
}),
want: func() image.Image {
img := image.NewRGBA(image.Rect(0, 0, 2, 2))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
img.Set(1, 0, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(0, 1, color.RGBA{R: 0, G: 0, B: 255, A: 255})
img.Set(1, 1, color.RGBA{R: 255, G: 0, B: 0, A: 255})
return img
}(),
wantErr: false,
},
{
name: "PNG format",
decoder: Decoder{
Format: PNG,
// Width and height are embedded and inferred from the PNG data
},
input: func() []byte {
img := image.NewRGBA(image.Rect(0, 0, 1, 1))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
var buf bytes.Buffer
png.Encode(&buf, img)
return buf.Bytes()
}(),
want: func() image.Image {
img := image.NewRGBA(image.Rect(0, 0, 1, 1))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
return img
}(),
wantErr: false,
},
{
name: "invalid format",
decoder: Decoder{
Format: 999,
Width: 2,
Height: 2,
},
input: []byte{0, 0, 0},
want: nil,
wantErr: true,
},
{
name: "incomplete RGBA data",
decoder: Decoder{
Format: RGBA,
Width: 2,
Height: 2,
},
input: []byte{255, 0, 0}, // Incomplete pixel data
want: nil,
wantErr: true,
},
{
name: "invalid compressed data",
decoder: Decoder{
Format: RGBA,
Width: 2,
Height: 2,
Decompress: true,
},
input: []byte{1, 2, 3}, // Invalid zlib data
want: nil,
wantErr: true,
},
{
name: "default format (RGBA)",
decoder: Decoder{
Width: 1,
Height: 1,
},
input: []byte{255, 0, 0, 255},
want: func() image.Image {
img := image.NewRGBA(image.Rect(0, 0, 1, 1))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
return img
}(),
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.decoder.Decode(bytes.NewReader(tt.input))
if (err != nil) != tt.wantErr {
t.Errorf("Decode() error = %v, wantErr %v", err, tt.wantErr)
return
}
if tt.wantErr {
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Decode() output mismatch")
if bounds := got.Bounds(); bounds != tt.want.Bounds() {
t.Errorf("bounds got %v, want %v", bounds, tt.want.Bounds())
}
// Compare pixels
bounds := got.Bounds()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
gotColor := got.At(x, y)
wantColor := tt.want.At(x, y)
if !reflect.DeepEqual(gotColor, wantColor) {
t.Errorf("pixel at (%d,%d) = %v, want %v", x, y, gotColor, wantColor)
}
}
}
}
})
}
}
func TestDecoder_DecodeEdgeCases(t *testing.T) {
tests := []struct {
name string
decoder Decoder
input []byte
wantErr bool
}{
{
name: "zero dimensions",
decoder: Decoder{
Format: RGBA,
Width: 0,
Height: 0,
},
input: []byte{},
wantErr: false,
},
{
name: "negative width",
decoder: Decoder{
Format: RGBA,
Width: -1,
Height: 1,
},
input: []byte{255, 0, 0, 255},
wantErr: false, // The image package handles this gracefully
},
{
name: "very large dimensions",
decoder: Decoder{
Format: RGBA,
Width: 1,
Height: 1000000, // Very large height
},
input: []byte{255, 0, 0, 255}, // Not enough data
wantErr: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := tt.decoder.Decode(bytes.NewReader(tt.input))
if (err != nil) != tt.wantErr {
t.Errorf("Decode() error = %v, wantErr %v", err, tt.wantErr)
}
})
}
}
|
