mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-14 15:07:26 +01:00
302 lines
6.5 KiB
Go
302 lines
6.5 KiB
Go
// Copyright 2022 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package colorm_test
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import (
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"fmt"
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"image/color"
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"math"
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"testing"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/colorm"
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t "github.com/hajimehoshi/ebiten/v2/internal/testing"
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"github.com/hajimehoshi/ebiten/v2/internal/ui"
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)
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func abs(x int) int {
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if x < 0 {
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return -x
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}
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return x
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}
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// sameColors compares c1 and c2 and returns a boolean value indicating
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// if the two colors are (almost) same.
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//
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// Pixels read from GPU might include errors (#492), and
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// sameColors considers such errors as delta.
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func sameColors(c1, c2 color.RGBA, delta int) bool {
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return abs(int(c1.R)-int(c2.R)) <= delta &&
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abs(int(c1.G)-int(c2.G)) <= delta &&
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abs(int(c1.B)-int(c2.B)) <= delta &&
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abs(int(c1.A)-int(c2.A)) <= delta
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}
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func TestMain(m *testing.M) {
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ui.SetPanicOnErrorOnReadingPixelsForTesting(true)
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t.MainWithRunLoop(m)
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}
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func TestDrawTrianglesWithColorM(t *testing.T) {
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const w, h = 16, 16
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dst0 := ebiten.NewImage(w, h)
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src := ebiten.NewImage(w, h)
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src.Fill(color.White)
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vs0 := []ebiten.Vertex{
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{
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DstX: 0,
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DstY: 0,
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SrcX: 0,
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SrcY: 0,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: w,
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DstY: 0,
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SrcX: w,
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SrcY: 0,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: 0,
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DstY: h,
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SrcX: 0,
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SrcY: h,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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{
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DstX: w,
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DstY: h,
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SrcX: w,
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SrcY: h,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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},
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}
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var cm colorm.ColorM
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cm.Scale(0.2, 0.4, 0.6, 0.8)
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op := &colorm.DrawTrianglesOptions{}
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is := []uint16{0, 1, 2, 1, 2, 3}
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colorm.DrawTriangles(dst0, vs0, is, src, cm, op)
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for _, format := range []ebiten.ColorScaleMode{
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ebiten.ColorScaleModeStraightAlpha,
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ebiten.ColorScaleModePremultipliedAlpha,
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} {
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format := format
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t.Run(fmt.Sprintf("format%d", format), func(t *testing.T) {
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var cr, cg, cb, ca float32
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switch format {
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case ebiten.ColorScaleModeStraightAlpha:
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// The values are the same as ColorM.Scale
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cr = 0.2
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cg = 0.4
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cb = 0.6
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ca = 0.8
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case ebiten.ColorScaleModePremultipliedAlpha:
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cr = 0.2 * 0.8
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cg = 0.4 * 0.8
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cb = 0.6 * 0.8
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ca = 0.8
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}
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vs1 := []ebiten.Vertex{
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{
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DstX: 0,
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DstY: 0,
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SrcX: 0,
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SrcY: 0,
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ColorR: cr,
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ColorG: cg,
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ColorB: cb,
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ColorA: ca,
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},
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{
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DstX: w,
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DstY: 0,
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SrcX: w,
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SrcY: 0,
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ColorR: cr,
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ColorG: cg,
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ColorB: cb,
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ColorA: ca,
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},
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{
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DstX: 0,
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DstY: h,
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SrcX: 0,
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SrcY: h,
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ColorR: cr,
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ColorG: cg,
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ColorB: cb,
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ColorA: ca,
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},
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{
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DstX: w,
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DstY: h,
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SrcX: w,
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SrcY: h,
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ColorR: cr,
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ColorG: cg,
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ColorB: cb,
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ColorA: ca,
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},
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}
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dst1 := ebiten.NewImage(w, h)
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op := &ebiten.DrawTrianglesOptions{}
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op.ColorScaleMode = format
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dst1.DrawTriangles(vs1, is, src, op)
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for j := 0; j < h; j++ {
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for i := 0; i < w; i++ {
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got := dst0.At(i, j)
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want := dst1.At(i, j)
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if got != want {
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t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
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}
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}
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}
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})
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}
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}
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func TestColorMAndScale(t *testing.T) {
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const w, h = 16, 16
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src := ebiten.NewImage(w, h)
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src.Fill(color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80})
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vs := []ebiten.Vertex{
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{
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SrcX: 0,
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SrcY: 0,
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DstX: 0,
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DstY: 0,
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ColorR: 0.5,
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ColorG: 0.25,
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ColorB: 0.5,
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ColorA: 0.75,
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},
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{
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SrcX: w,
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SrcY: 0,
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DstX: w,
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DstY: 0,
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ColorR: 0.5,
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ColorG: 0.25,
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ColorB: 0.5,
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ColorA: 0.75,
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},
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{
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SrcX: 0,
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SrcY: h,
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DstX: 0,
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DstY: h,
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ColorR: 0.5,
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ColorG: 0.25,
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ColorB: 0.5,
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ColorA: 0.75,
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},
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{
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SrcX: w,
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SrcY: h,
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DstX: w,
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DstY: h,
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ColorR: 0.5,
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ColorG: 0.25,
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ColorB: 0.5,
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ColorA: 0.75,
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},
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}
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is := []uint16{0, 1, 2, 1, 2, 3}
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for _, format := range []ebiten.ColorScaleMode{
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ebiten.ColorScaleModeStraightAlpha,
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ebiten.ColorScaleModePremultipliedAlpha,
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} {
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format := format
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t.Run(fmt.Sprintf("format%d", format), func(t *testing.T) {
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dst := ebiten.NewImage(w, h)
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var cm colorm.ColorM
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cm.Translate(0.25, 0.25, 0.25, 0)
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op := &colorm.DrawTrianglesOptions{}
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op.ColorScaleMode = format
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colorm.DrawTriangles(dst, vs, is, src, cm, op)
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got := dst.At(0, 0).(color.RGBA)
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alphaBeforeScale := 0.5
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var want color.RGBA
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switch format {
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case ebiten.ColorScaleModeStraightAlpha:
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want = color.RGBA{
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R: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
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G: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.25 * 0.75)),
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B: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
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A: byte(math.Floor(0xff * alphaBeforeScale * 0.75)),
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}
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case ebiten.ColorScaleModePremultipliedAlpha:
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want = color.RGBA{
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R: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5)),
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G: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.25)),
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B: byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5)),
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A: byte(math.Floor(0xff * alphaBeforeScale * 0.75)),
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}
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}
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if !sameColors(got, want, 2) {
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t.Errorf("got: %v, want: %v", got, want)
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}
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})
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}
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}
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// Issue #1213
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func TestColorMCopy(t *testing.T) {
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const w, h = 16, 16
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dst := ebiten.NewImage(w, h)
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src := ebiten.NewImage(w, h)
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for k := 0; k < 256; k++ {
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var cm colorm.ColorM
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cm.Translate(1, 1, 1, float64(k)/0xff)
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op := &colorm.DrawImageOptions{}
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op.Blend = ebiten.BlendCopy
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colorm.DrawImage(dst, src, cm, op)
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for j := 0; j < h; j++ {
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for i := 0; i < w; i++ {
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got := dst.At(i, j).(color.RGBA)
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want := color.RGBA{R: byte(k), G: byte(k), B: byte(k), A: byte(k)}
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if !sameColors(got, want, 1) {
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t.Fatalf("dst.At(%d, %d), k: %d: got %v, want %v", i, j, k, got, want)
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}
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}
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}
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}
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}
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