ebiten/colorm/draw_test.go

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// Copyright 2022 The Ebitengine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package colorm_test
import (
"fmt"
"image/color"
"math"
"testing"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/colorm"
t "github.com/hajimehoshi/ebiten/v2/internal/testing"
"github.com/hajimehoshi/ebiten/v2/internal/ui"
)
func abs(x int) int {
if x < 0 {
return -x
}
return x
}
// sameColors compares c1 and c2 and returns a boolean value indicating
// if the two colors are (almost) same.
//
// Pixels read from GPU might include errors (#492), and
// sameColors considers such errors as delta.
func sameColors(c1, c2 color.RGBA, delta int) bool {
return abs(int(c1.R)-int(c2.R)) <= delta &&
abs(int(c1.G)-int(c2.G)) <= delta &&
abs(int(c1.B)-int(c2.B)) <= delta &&
abs(int(c1.A)-int(c2.A)) <= delta
}
func TestMain(m *testing.M) {
ui.SetPanicOnErrorOnReadingPixelsForTesting(true)
t.MainWithRunLoop(m)
}
func TestDrawTrianglesWithColorM(t *testing.T) {
const w, h = 16, 16
dst0 := ebiten.NewImage(w, h)
src := ebiten.NewImage(w, h)
src.Fill(color.White)
vs0 := []ebiten.Vertex{
{
DstX: 0,
DstY: 0,
SrcX: 0,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: w,
DstY: 0,
SrcX: w,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: 0,
DstY: h,
SrcX: 0,
SrcY: h,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: w,
DstY: h,
SrcX: w,
SrcY: h,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
}
var cm colorm.ColorM
cm.Scale(0.2, 0.4, 0.6, 0.8)
op := &colorm.DrawTrianglesOptions{}
is := []uint16{0, 1, 2, 1, 2, 3}
colorm.DrawTriangles(dst0, vs0, is, src, cm, op)
for _, format := range []ebiten.ColorScaleMode{
ebiten.ColorScaleModeStraightAlpha,
ebiten.ColorScaleModePremultipliedAlpha,
} {
format := format
t.Run(fmt.Sprintf("format%d", format), func(t *testing.T) {
var cr, cg, cb, ca float32
switch format {
case ebiten.ColorScaleModeStraightAlpha:
// The values are the same as ColorM.Scale
cr = 0.2
cg = 0.4
cb = 0.6
ca = 0.8
case ebiten.ColorScaleModePremultipliedAlpha:
cr = 0.2 * 0.8
cg = 0.4 * 0.8
cb = 0.6 * 0.8
ca = 0.8
}
vs1 := []ebiten.Vertex{
{
DstX: 0,
DstY: 0,
SrcX: 0,
SrcY: 0,
ColorR: cr,
ColorG: cg,
ColorB: cb,
ColorA: ca,
},
{
DstX: w,
DstY: 0,
SrcX: w,
SrcY: 0,
ColorR: cr,
ColorG: cg,
ColorB: cb,
ColorA: ca,
},
{
DstX: 0,
DstY: h,
SrcX: 0,
SrcY: h,
ColorR: cr,
ColorG: cg,
ColorB: cb,
ColorA: ca,
},
{
DstX: w,
DstY: h,
SrcX: w,
SrcY: h,
ColorR: cr,
ColorG: cg,
ColorB: cb,
ColorA: ca,
},
}
dst1 := ebiten.NewImage(w, h)
op := &ebiten.DrawTrianglesOptions{}
op.ColorScaleMode = format
dst1.DrawTriangles(vs1, is, src, op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst0.At(i, j)
want := dst1.At(i, j)
if got != want {
t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
})
}
}
func TestColorMAndScale(t *testing.T) {
const w, h = 16, 16
src := ebiten.NewImage(w, h)
src.Fill(color.RGBA{0x80, 0x80, 0x80, 0x80})
vs := []ebiten.Vertex{
{
SrcX: 0,
SrcY: 0,
DstX: 0,
DstY: 0,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: w,
SrcY: 0,
DstX: w,
DstY: 0,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: 0,
SrcY: h,
DstX: 0,
DstY: h,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: w,
SrcY: h,
DstX: w,
DstY: h,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
}
is := []uint16{0, 1, 2, 1, 2, 3}
for _, format := range []ebiten.ColorScaleMode{
ebiten.ColorScaleModeStraightAlpha,
ebiten.ColorScaleModePremultipliedAlpha,
} {
format := format
t.Run(fmt.Sprintf("format%d", format), func(t *testing.T) {
dst := ebiten.NewImage(w, h)
var cm colorm.ColorM
cm.Translate(0.25, 0.25, 0.25, 0)
op := &colorm.DrawTrianglesOptions{}
op.ColorScaleMode = format
colorm.DrawTriangles(dst, vs, is, src, cm, op)
got := dst.At(0, 0).(color.RGBA)
alphaBeforeScale := 0.5
var want color.RGBA
switch format {
case ebiten.ColorScaleModeStraightAlpha:
want = color.RGBA{
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.25 * 0.75)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
byte(math.Floor(0xff * alphaBeforeScale * 0.75)),
}
case ebiten.ColorScaleModePremultipliedAlpha:
want = color.RGBA{
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.25)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5)),
byte(math.Floor(0xff * alphaBeforeScale * 0.75)),
}
}
if !sameColors(got, want, 2) {
t.Errorf("got: %v, want: %v", got, want)
}
})
}
}
// Issue #1213
func TestColorMCopy(t *testing.T) {
const w, h = 16, 16
dst := ebiten.NewImage(w, h)
src := ebiten.NewImage(w, h)
for k := 0; k < 256; k++ {
var cm colorm.ColorM
cm.Translate(1, 1, 1, float64(k)/0xff)
op := &colorm.DrawImageOptions{}
op.Blend = ebiten.BlendCopy
colorm.DrawImage(dst, src, cm, op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j).(color.RGBA)
want := color.RGBA{byte(k), byte(k), byte(k), byte(k)}
if !sameColors(got, want, 1) {
t.Fatalf("dst.At(%d, %d), k: %d: got %v, want %v", i, j, k, got, want)
}
}
}
}
}