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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package image_test

import (
        . "image"
        "image/color"
        "testing"
)

type image interface {
        Image
        Opaque() bool
        Set(int, int, color.Color)
        SubImage(Rectangle) Image
}

func cmp(t *testing.T, cm color.Model, c0, c1 color.Color) bool {
        r0, g0, b0, a0 := cm.Convert(c0).RGBA()
        r1, g1, b1, a1 := cm.Convert(c1).RGBA()
        return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
}

func TestImage(t *testing.T) {
        testImage := []image{
                NewRGBA(Rect(0, 0, 10, 10)),
                NewRGBA64(Rect(0, 0, 10, 10)),
                NewNRGBA(Rect(0, 0, 10, 10)),
                NewNRGBA64(Rect(0, 0, 10, 10)),
                NewAlpha(Rect(0, 0, 10, 10)),
                NewAlpha16(Rect(0, 0, 10, 10)),
                NewGray(Rect(0, 0, 10, 10)),
                NewGray16(Rect(0, 0, 10, 10)),
                NewPaletted(Rect(0, 0, 10, 10), color.Palette{
                        Transparent,
                        Opaque,
                }),
        }
        for _, m := range testImage {
                if !Rect(0, 0, 10, 10).Eq(m.Bounds()) {
                        t.Errorf("%T: want bounds %v, got %v", m, Rect(0, 0, 10, 10), m.Bounds())
                        continue
                }
                if !cmp(t, m.ColorModel(), Transparent, m.At(6, 3)) {
                        t.Errorf("%T: at (6, 3), want a zero color, got %v", m, m.At(6, 3))
                        continue
                }
                m.Set(6, 3, Opaque)
                if !cmp(t, m.ColorModel(), Opaque, m.At(6, 3)) {
                        t.Errorf("%T: at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
                        continue
                }
                if !m.SubImage(Rect(6, 3, 7, 4)).(image).Opaque() {
                        t.Errorf("%T: at (6, 3) was not opaque", m)
                        continue
                }
                m = m.SubImage(Rect(3, 2, 9, 8)).(image)
                if !Rect(3, 2, 9, 8).Eq(m.Bounds()) {
                        t.Errorf("%T: sub-image want bounds %v, got %v", m, Rect(3, 2, 9, 8), m.Bounds())
                        continue
                }
                if !cmp(t, m.ColorModel(), Opaque, m.At(6, 3)) {
                        t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
                        continue
                }
                if !cmp(t, m.ColorModel(), Transparent, m.At(3, 3)) {
                        t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", m, m.At(3, 3))
                        continue
                }
                m.Set(3, 3, Opaque)
                if !cmp(t, m.ColorModel(), Opaque, m.At(3, 3)) {
                        t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", m, m.At(3, 3))
                        continue
                }
                // Test that taking an empty sub-image starting at a corner does not panic.
                m.SubImage(Rect(0, 0, 0, 0))
                m.SubImage(Rect(10, 0, 10, 0))
                m.SubImage(Rect(0, 10, 0, 10))
                m.SubImage(Rect(10, 10, 10, 10))
        }
}

func Test16BitsPerColorChannel(t *testing.T) {
        testColorModel := []color.Model{
                color.RGBA64Model,
                color.NRGBA64Model,
                color.Alpha16Model,
                color.Gray16Model,
        }
        for _, cm := range testColorModel {
                c := cm.Convert(color.RGBA64{0x1234, 0x1234, 0x1234, 0x1234}) // Premultiplied alpha.
                r, _, _, _ := c.RGBA()
                if r != 0x1234 {
                        t.Errorf("%T: want red value 0x%04x got 0x%04x", c, 0x1234, r)
                        continue
                }
        }
        testImage := []image{
                NewRGBA64(Rect(0, 0, 10, 10)),
                NewNRGBA64(Rect(0, 0, 10, 10)),
                NewAlpha16(Rect(0, 0, 10, 10)),
                NewGray16(Rect(0, 0, 10, 10)),
        }
        for _, m := range testImage {
                m.Set(1, 2, color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}) // Non-premultiplied alpha.
                r, _, _, _ := m.At(1, 2).RGBA()
                if r != 0x1357 {
                        t.Errorf("%T: want red value 0x%04x got 0x%04x", m, 0x1357, r)
                        continue
                }
        }
}