graphicscommand: Add tests

internal/graphicscommand/image_test.go

@@ -0,0 +1,87 @@
+// Copyright 2018 The Ebiten 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 graphicscommand_test
+
+import (
+	"errors"
+	"image/color"
+	"os"
+	"testing"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/internal/graphics"
+	. "github.com/hajimehoshi/ebiten/internal/graphicscommand"
+	"github.com/hajimehoshi/ebiten/internal/testflock"
+)
+
+func TestMain(m *testing.M) {
+	testflock.Lock()
+	defer testflock.Unlock()
+
+	code := 0
+	regularTermination := errors.New("regular termination")
+	f := func(screen *ebiten.Image) error {
+		code = m.Run()
+		return regularTermination
+	}
+	if err := ebiten.Run(f, 320, 240, 1, "Test"); err != nil && err != regularTermination {
+		panic(err)
+	}
+	os.Exit(code)
+}
+
+func TestCopy(t *testing.T) {
+	const w, h = 1024, 1024
+	src := NewImage(w/2, h/2)
+	dst := NewImage(w, h)
+	pix := dst.Pixels()
+	for j := 0; j < h/2; j++ {
+		for i := 0; i < w/2; i++ {
+			idx := 4 * (i + w*j)
+			got := color.RGBA{pix[idx], pix[idx+1], pix[idx+2], pix[idx+3]}
+			want := color.RGBA{}
+			if got != want {
+				t.Errorf("dst.At(%d, %d): got %v, want: %v", i, j, got, want)
+			}
+		}
+	}
+	pix = src.Pixels()
+	for j := 0; j < h/2; j++ {
+		for i := 0; i < w/2; i++ {
+			idx := 4 * (i + (w/2)*j)
+			got := color.RGBA{pix[idx], pix[idx+1], pix[idx+2], pix[idx+3]}
+			want := color.RGBA{}
+			if got != want {
+				t.Errorf("src.At(%d, %d): got %v, want: %v", i, j, got, want)
+			}
+		}
+	}
+
+	vs := graphics.QuadVertices(w/2, h/2, 0, 0, w/2, h/2, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
+	is := graphics.QuadIndices()
+	dst.DrawImage(src, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
+
+	pix = dst.Pixels()
+	for j := 0; j < h/2; j++ {
+		for i := 0; i < w/2; i++ {
+			idx := 4 * (i + w*j)
+			got := color.RGBA{pix[idx], pix[idx+1], pix[idx+2], pix[idx+3]}
+			want := color.RGBA{}
+			if got != want {
+				t.Errorf("dst.At(%d, %d) after DrawImage: got %v, want: %v", i, j, got, want)
+			}
+		}
+	}
+}