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resize_test.go
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package transform
import (
"image"
"testing"
"github.com/anthonynsimon/bild/util"
)
func TestResize(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "empty",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 0,
Rect: image.Rect(0, 0, 0, 0),
Pix: []uint8{},
},
expected: &image.RGBA{
Stride: 0,
Rect: image.Rect(0, 0, 0, 0),
Pix: []uint8{},
},
},
{
name: "x1",
width: 1,
height: 1,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
expected: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
},
{
name: "x2",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
name: "only horizontal x2",
width: 2,
height: 1,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 1),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
name: "only vertical x2",
width: 1,
height: 2,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
expected: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
name: "x0.5",
width: 1,
height: 1,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{0xFF, 0xFF, 0xFF, 0xFF},
},
},
{
name: "only horizontal x0.5",
width: 1,
height: 2,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
name: "only vertical x0.5",
width: 2,
height: 1,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 1),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
name: "x0",
width: 0,
height: 0,
img: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 2),
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Stride: 0,
Rect: image.Rect(0, 0, 0, 0),
Pix: []uint8{},
},
},
}
for _, c := range cases {
result := Resize(c.img, c.width, c.height, NearestNeighbor)
if !util.RGBAImageEqual(result, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "Resize no filter "+c.name, c.expected, result)
}
result = Resize(c.img, c.width, c.height, Linear)
if !util.RGBAImageEqual(result, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "Resize with filter "+c.name, c.expected, result)
}
}
}
func TestResizeNearestNeighbor(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, NearestNeighbor)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeNearestNeighbor "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeBox(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, Box)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeNearestNeighbor "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeLinear(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xA3, 0x31, 0x31, 0xF9, 0x41, 0xB3, 0x21, 0xEA,
0x40, 0x21, 0xB3, 0xEA, 0x5B, 0x7A, 0x7A, 0xB0,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, Linear)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeLinear "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeGaussian(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xD6, 0x29, 0x0, 0xFF, 0x29, 0xD6, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xD6, 0x0, 0x29, 0xFF, 0xB7, 0x26, 0x25, 0xFC, 0x34, 0xC5, 0x18, 0xEE, 0x14, 0xEB, 0x14, 0xEB,
0x29, 0x0, 0xD6, 0xFF, 0x33, 0x17, 0xC6, 0xEE, 0x61, 0x7D, 0x7C, 0xA5, 0x6C, 0x94, 0x6C, 0x94,
0x0, 0x0, 0xFF, 0xFF, 0x14, 0x14, 0xEB, 0xEB, 0x6C, 0x6C, 0x94, 0x94, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xAF, 0x2A, 0x2A, 0xFB, 0x39, 0xBE, 0x1B, 0xEC,
0x39, 0x1B, 0xBE, 0xEC, 0x5E, 0x7C, 0x7C, 0xAA,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, Gaussian)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeGaussian "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeCatmullRom(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xD9, 0x37, 0x0, 0xFF, 0x31, 0xD3, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xCA, 0x0, 0x35, 0xFF, 0xA6, 0x30, 0x2F, 0xFA, 0x3F, 0xB5, 0x20, 0xEA, 0x1D, 0xE7, 0x18, 0xE2,
0x35, 0x0, 0xCA, 0xFF, 0x3F, 0x20, 0xB6, 0xEA, 0x5B, 0x7A, 0x7A, 0xAF, 0x6E, 0xA3, 0x5D, 0x92,
0x0, 0x0, 0xFF, 0xFF, 0xC, 0x19, 0xF9, 0xE3, 0x69, 0x5C, 0xA8, 0x91, 0x97, 0x81, 0x7F, 0x69,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xB4, 0x27, 0x27, 0xFC, 0x36, 0xC3, 0x19, 0xED,
0x35, 0x19, 0xC3, 0xED, 0x60, 0x7C, 0x7C, 0xA7,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, CatmullRom)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeCatmullRom "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeMitchell(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xC5, 0x40, 0x0, 0xFF, 0x3E, 0xC3, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xC0, 0x0, 0x3F, 0xFF, 0x99, 0x37, 0x37, 0xF7, 0x47, 0xA8, 0x27, 0xE7, 0x21, 0xE1, 0x1F, 0xDF,
0x3F, 0x0, 0xC0, 0xFF, 0x47, 0x28, 0xA9, 0xE8, 0x58, 0x78, 0x78, 0xB7, 0x63, 0xA2, 0x5D, 0x9C,
0x0, 0x0, 0xFF, 0xFF, 0x1B, 0x1F, 0xE7, 0xDF, 0x61, 0x5D, 0xA4, 0x9C, 0x88, 0x80, 0x80, 0x78,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xA7, 0x2E, 0x2F, 0xFA, 0x3E, 0xB7, 0x1F, 0xEA,
0x3E, 0x1F, 0xB7, 0xEB, 0x5C, 0x7B, 0x7B, 0xAE,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, MitchellNetravali)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeMitchell "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestResizeLanczos(t *testing.T) {
cases := []struct {
name string
width int
height int
img *image.RGBA
expected *image.RGBA
}{
{
name: "x2",
width: 4,
height: 4,
img: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xE1, 0x40, 0x0, 0xFF, 0x34, 0xD5, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xC4, 0x0, 0x3B, 0xFF, 0x9D, 0x34, 0x34, 0xF8, 0x44, 0xAD, 0x25, 0xE8, 0x23, 0xE7, 0x19, 0xDC,
0x3B, 0x0, 0xC4, 0xFF, 0x45, 0x25, 0xAD, 0xE8, 0x59, 0x79, 0x79, 0xB5, 0x73, 0xAE, 0x51, 0x8D,
0x0, 0x0, 0xFF, 0xFF, 0x1, 0x19, 0xFF, 0xDC, 0x69, 0x51, 0xBA, 0x8D, 0xB0, 0x84, 0x7D, 0x50,
},
},
},
{
name: "x0.5",
width: 2,
height: 2,
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(0, 0, 2, 2),
Pix: []uint8{
0xBA, 0x24, 0x24, 0xFC, 0x31, 0xC8, 0x17, 0xEF,
0x32, 0x17, 0xC8, 0xEF, 0x62, 0x7D, 0x7D, 0xA4,
},
},
},
}
for _, c := range cases {
actual := Resize(c.img, c.width, c.height, Lanczos)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "ResizeLanczos "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestCrop(t *testing.T) {
cases := []struct {
name string
rect image.Rectangle
img *image.RGBA
expected *image.RGBA
}{
{
name: "center",
rect: image.Rect(1, 1, 3, 3),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(1, 1, 3, 3),
Pix: []uint8{
0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7,
0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8,
},
},
},
{
name: "top left",
rect: image.Rect(0, 0, 1, 1),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 1 * 4,
Rect: image.Rect(0, 0, 1, 1),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF,
},
},
},
{
name: "no change",
rect: image.Rect(0, 0, 4, 4),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "larger intersect",
rect: image.Rect(-50, -50, 50, 50),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "horizontal only",
rect: image.Rect(2, 0, 4, 4),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 2 * 4,
Rect: image.Rect(2, 0, 4, 4),
Pix: []uint8{
0x40, 0xBF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
name: "vertical only",
rect: image.Rect(0, 2, 4, 4),
img: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 0, 4, 4),
Pix: []uint8{
0xFF, 0x0, 0x0, 0xFF, 0xBF, 0x40, 0x0, 0xFF, 0x40, 0xBF, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF,
0xBF, 0x0, 0x40, 0xFF, 0x97, 0x38, 0x38, 0xF7, 0x48, 0xA7, 0x28, 0xE7, 0x20, 0xDF, 0x20, 0xDF,
0x40, 0x0, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x0, 0x0, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Stride: 4 * 4,
Rect: image.Rect(0, 2, 4, 4),
Pix: []uint8{
0x40, 0x00, 0xBF, 0xFF, 0x48, 0x28, 0xA7, 0xE7, 0x58, 0x78, 0x78, 0xB8, 0x60, 0xA0, 0x60, 0xA0,
0x00, 0x00, 0xFF, 0xFF, 0x20, 0x20, 0xDF, 0xDF, 0x60, 0x60, 0xA0, 0xA0, 0x80, 0x80, 0x80, 0x80,
},
},
},
}
for _, c := range cases {
actual := Crop(c.img, c.rect)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "Crop "+c.name, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func BenchmarkResizeTenth(b *testing.B) {
benchResize(b, 4096, 4096, 0.1, Linear)
}
func BenchmarkResizeQuarter(b *testing.B) {
benchResize(b, 4096, 4096, 0.25, Linear)
}
func BenchmarkResizeHalf(b *testing.B) {
benchResize(b, 4096, 4096, 0.5, Linear)
}
func BenchmarkResize1x(b *testing.B) {
benchResize(b, 1024, 1024, 1.0, Linear)
}
func BenchmarkResize2x(b *testing.B) {
benchResize(b, 1024, 1024, 2.0, Linear)
}
func BenchmarkResize4x(b *testing.B) {
benchResize(b, 1024, 1024, 4.0, Linear)
}
func BenchmarkResize8x(b *testing.B) {
benchResize(b, 1024, 1024, 8.0, Linear)
}
func BenchmarkResize16x(b *testing.B) {
benchResize(b, 1024, 1024, 16.0, Linear)
}
func benchResize(b *testing.B, w, h int, scale float64, f ResampleFilter) {
newW := int(float64(w) * scale)
newH := int(float64(h) * scale)
img := image.NewRGBA(image.Rect(0, 0, w, h))
b.ResetTimer()
for n := 0; n < b.N; n++ {
Resize(img, newW, newH, f)
}
}