Colin Cross | 7bb052a | 2015-02-03 12:59:37 -0800 | [diff] [blame^] | 1 | // Copyright 2011 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package draw |
| 6 | |
| 7 | import ( |
| 8 | "image" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | type clipTest struct { |
| 13 | desc string |
| 14 | r, dr, sr, mr image.Rectangle |
| 15 | sp, mp image.Point |
| 16 | nilMask bool |
| 17 | r0 image.Rectangle |
| 18 | sp0, mp0 image.Point |
| 19 | } |
| 20 | |
| 21 | var clipTests = []clipTest{ |
| 22 | // The following tests all have a nil mask. |
| 23 | { |
| 24 | "basic", |
| 25 | image.Rect(0, 0, 100, 100), |
| 26 | image.Rect(0, 0, 100, 100), |
| 27 | image.Rect(0, 0, 100, 100), |
| 28 | image.ZR, |
| 29 | image.ZP, |
| 30 | image.ZP, |
| 31 | true, |
| 32 | image.Rect(0, 0, 100, 100), |
| 33 | image.ZP, |
| 34 | image.ZP, |
| 35 | }, |
| 36 | { |
| 37 | "clip dr", |
| 38 | image.Rect(0, 0, 100, 100), |
| 39 | image.Rect(40, 40, 60, 60), |
| 40 | image.Rect(0, 0, 100, 100), |
| 41 | image.ZR, |
| 42 | image.ZP, |
| 43 | image.ZP, |
| 44 | true, |
| 45 | image.Rect(40, 40, 60, 60), |
| 46 | image.Pt(40, 40), |
| 47 | image.ZP, |
| 48 | }, |
| 49 | { |
| 50 | "clip sr", |
| 51 | image.Rect(0, 0, 100, 100), |
| 52 | image.Rect(0, 0, 100, 100), |
| 53 | image.Rect(20, 20, 80, 80), |
| 54 | image.ZR, |
| 55 | image.ZP, |
| 56 | image.ZP, |
| 57 | true, |
| 58 | image.Rect(20, 20, 80, 80), |
| 59 | image.Pt(20, 20), |
| 60 | image.ZP, |
| 61 | }, |
| 62 | { |
| 63 | "clip dr and sr", |
| 64 | image.Rect(0, 0, 100, 100), |
| 65 | image.Rect(0, 0, 50, 100), |
| 66 | image.Rect(20, 20, 80, 80), |
| 67 | image.ZR, |
| 68 | image.ZP, |
| 69 | image.ZP, |
| 70 | true, |
| 71 | image.Rect(20, 20, 50, 80), |
| 72 | image.Pt(20, 20), |
| 73 | image.ZP, |
| 74 | }, |
| 75 | { |
| 76 | "clip dr and sr, sp outside sr (top-left)", |
| 77 | image.Rect(0, 0, 100, 100), |
| 78 | image.Rect(0, 0, 50, 100), |
| 79 | image.Rect(20, 20, 80, 80), |
| 80 | image.ZR, |
| 81 | image.Pt(15, 8), |
| 82 | image.ZP, |
| 83 | true, |
| 84 | image.Rect(5, 12, 50, 72), |
| 85 | image.Pt(20, 20), |
| 86 | image.ZP, |
| 87 | }, |
| 88 | { |
| 89 | "clip dr and sr, sp outside sr (middle-left)", |
| 90 | image.Rect(0, 0, 100, 100), |
| 91 | image.Rect(0, 0, 50, 100), |
| 92 | image.Rect(20, 20, 80, 80), |
| 93 | image.ZR, |
| 94 | image.Pt(15, 66), |
| 95 | image.ZP, |
| 96 | true, |
| 97 | image.Rect(5, 0, 50, 14), |
| 98 | image.Pt(20, 66), |
| 99 | image.ZP, |
| 100 | }, |
| 101 | { |
| 102 | "clip dr and sr, sp outside sr (bottom-left)", |
| 103 | image.Rect(0, 0, 100, 100), |
| 104 | image.Rect(0, 0, 50, 100), |
| 105 | image.Rect(20, 20, 80, 80), |
| 106 | image.ZR, |
| 107 | image.Pt(15, 91), |
| 108 | image.ZP, |
| 109 | true, |
| 110 | image.ZR, |
| 111 | image.Pt(15, 91), |
| 112 | image.ZP, |
| 113 | }, |
| 114 | { |
| 115 | "clip dr and sr, sp inside sr", |
| 116 | image.Rect(0, 0, 100, 100), |
| 117 | image.Rect(0, 0, 50, 100), |
| 118 | image.Rect(20, 20, 80, 80), |
| 119 | image.ZR, |
| 120 | image.Pt(44, 33), |
| 121 | image.ZP, |
| 122 | true, |
| 123 | image.Rect(0, 0, 36, 47), |
| 124 | image.Pt(44, 33), |
| 125 | image.ZP, |
| 126 | }, |
| 127 | |
| 128 | // The following tests all have a non-nil mask. |
| 129 | { |
| 130 | "basic mask", |
| 131 | image.Rect(0, 0, 80, 80), |
| 132 | image.Rect(20, 0, 100, 80), |
| 133 | image.Rect(0, 0, 50, 49), |
| 134 | image.Rect(0, 0, 46, 47), |
| 135 | image.ZP, |
| 136 | image.ZP, |
| 137 | false, |
| 138 | image.Rect(20, 0, 46, 47), |
| 139 | image.Pt(20, 0), |
| 140 | image.Pt(20, 0), |
| 141 | }, |
| 142 | // TODO(nigeltao): write more tests. |
| 143 | } |
| 144 | |
| 145 | func TestClip(t *testing.T) { |
| 146 | dst0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) |
| 147 | src0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) |
| 148 | mask0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) |
| 149 | for _, c := range clipTests { |
| 150 | dst := dst0.SubImage(c.dr).(*image.RGBA) |
| 151 | src := src0.SubImage(c.sr).(*image.RGBA) |
| 152 | var mask image.Image |
| 153 | if !c.nilMask { |
| 154 | mask = mask0.SubImage(c.mr) |
| 155 | } |
| 156 | r, sp, mp := c.r, c.sp, c.mp |
| 157 | clip(dst, &r, src, &sp, mask, &mp) |
| 158 | |
| 159 | // Check that the actual results equal the expected results. |
| 160 | if !c.r0.Eq(r) { |
| 161 | t.Errorf("%s: clip rectangle want %v got %v", c.desc, c.r0, r) |
| 162 | continue |
| 163 | } |
| 164 | if !c.sp0.Eq(sp) { |
| 165 | t.Errorf("%s: sp want %v got %v", c.desc, c.sp0, sp) |
| 166 | continue |
| 167 | } |
| 168 | if !c.nilMask { |
| 169 | if !c.mp0.Eq(mp) { |
| 170 | t.Errorf("%s: mp want %v got %v", c.desc, c.mp0, mp) |
| 171 | continue |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | // Check that the clipped rectangle is contained by the dst / src / mask |
| 176 | // rectangles, in their respective co-ordinate spaces. |
| 177 | if !r.In(c.dr) { |
| 178 | t.Errorf("%s: c.dr %v does not contain r %v", c.desc, c.dr, r) |
| 179 | } |
| 180 | // sr is r translated into src's co-ordinate space. |
| 181 | sr := r.Add(c.sp.Sub(c.dr.Min)) |
| 182 | if !sr.In(c.sr) { |
| 183 | t.Errorf("%s: c.sr %v does not contain sr %v", c.desc, c.sr, sr) |
| 184 | } |
| 185 | if !c.nilMask { |
| 186 | // mr is r translated into mask's co-ordinate space. |
| 187 | mr := r.Add(c.mp.Sub(c.dr.Min)) |
| 188 | if !mr.In(c.mr) { |
| 189 | t.Errorf("%s: c.mr %v does not contain mr %v", c.desc, c.mr, mr) |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | } |