1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/core/SkBitmap.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkFont.h"
12 #include "include/core/SkMatrix.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkPathEffect.h"
15 #include "include/core/SkPoint.h"
16 #include "include/core/SkRect.h"
17 #include "include/core/SkRefCnt.h"
18 #include "include/core/SkScalar.h"
19 #include "include/core/SkSurface.h"
20 #include "include/core/SkTypeface.h"
21 #include "include/core/SkTypes.h"
22 #include "include/effects/SkDashPathEffect.h"
23 #include "tests/Test.h"
24
25 #include <cmath>
26
27 static const SkColor bgColor = SK_ColorWHITE;
28
create(SkBitmap * bm,SkIRect bound)29 static void create(SkBitmap* bm, SkIRect bound) {
30 bm->allocN32Pixels(bound.width(), bound.height());
31 }
32
33 /** Assumes that the ref draw was completely inside ref canvas --
34 implies that everything outside is "bgColor".
35 Checks that all overlap is the same and that all non-overlap on the
36 ref is "bgColor".
37 */
compare(const SkBitmap & ref,const SkIRect & iref,const SkBitmap & test,const SkIRect & itest)38 static bool compare(const SkBitmap& ref, const SkIRect& iref,
39 const SkBitmap& test, const SkIRect& itest)
40 {
41 const int xOff = itest.fLeft - iref.fLeft;
42 const int yOff = itest.fTop - iref.fTop;
43
44 for (int y = 0; y < test.height(); ++y) {
45 for (int x = 0; x < test.width(); ++x) {
46 SkColor testColor = test.getColor(x, y);
47 int refX = x + xOff;
48 int refY = y + yOff;
49 SkColor refColor;
50 if (refX >= 0 && refX < ref.width() &&
51 refY >= 0 && refY < ref.height())
52 {
53 refColor = ref.getColor(refX, refY);
54 } else {
55 refColor = bgColor;
56 }
57 if (refColor != testColor) {
58 return false;
59 }
60 }
61 }
62 return true;
63 }
64
65 /** Test that drawing glyphs with empty paths is different from drawing glyphs without paths. */
DEF_TEST(DrawText_dashout,reporter)66 DEF_TEST(DrawText_dashout, reporter) {
67 SkIRect size = SkIRect::MakeWH(64, 64);
68
69 SkBitmap drawTextBitmap;
70 create(&drawTextBitmap, size);
71 SkCanvas drawTextCanvas(drawTextBitmap);
72
73 SkBitmap drawDashedTextBitmap;
74 create(&drawDashedTextBitmap, size);
75 SkCanvas drawDashedTextCanvas(drawDashedTextBitmap);
76
77 SkBitmap emptyBitmap;
78 create(&emptyBitmap, size);
79 SkCanvas emptyCanvas(emptyBitmap);
80
81 SkPoint point = SkPoint::Make(25.0f, 25.0f);
82 SkFont font(nullptr, 20);
83 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
84 font.setSubpixel(true);
85
86 SkPaint paint;
87 paint.setColor(SK_ColorGRAY);
88 paint.setStyle(SkPaint::kStroke_Style);
89
90 // Draw a stroked "A" without a dash which will draw something.
91 drawTextCanvas.drawColor(SK_ColorWHITE);
92 drawTextCanvas.drawString("A", point.fX, point.fY, font, paint);
93
94 // Draw an "A" but with a dash which will never draw anything.
95 paint.setStrokeWidth(2);
96 constexpr SkScalar bigInterval = 10000;
97 static constexpr SkScalar intervals[] = { 1, bigInterval };
98 paint.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 2));
99
100 drawDashedTextCanvas.drawColor(SK_ColorWHITE);
101 drawDashedTextCanvas.drawString("A", point.fX, point.fY, font, paint);
102
103 // Draw nothing.
104 emptyCanvas.drawColor(SK_ColorWHITE);
105
106 REPORTER_ASSERT(reporter, !compare(drawTextBitmap, size, emptyBitmap, size));
107 REPORTER_ASSERT(reporter, compare(drawDashedTextBitmap, size, emptyBitmap, size));
108 }
109
110 // Test drawing text at some unusual coordinates.
111 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates,r)112 DEF_TEST(DrawText_weirdCoordinates, r) {
113 auto surface = SkSurface::MakeRasterN32Premul(10,10);
114 auto canvas = surface->getCanvas();
115
116 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
117
118 for (auto x : oddballs) {
119 canvas->drawString("a", +x, 0.0f, SkFont(), SkPaint());
120 canvas->drawString("a", -x, 0.0f, SkFont(), SkPaint());
121 }
122 for (auto y : oddballs) {
123 canvas->drawString("a", 0.0f, +y, SkFont(), SkPaint());
124 canvas->drawString("a", 0.0f, -y, SkFont(), SkPaint());
125 }
126 }
127
128 // Test drawing text with some unusual matricies.
129 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdMatricies,r)130 DEF_TEST(DrawText_weirdMatricies, r) {
131 auto surface = SkSurface::MakeRasterN32Premul(100,100);
132 auto canvas = surface->getCanvas();
133
134 SkFont font;
135 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
136
137 struct {
138 SkScalar textSize;
139 SkScalar matrix[9];
140 } testCases[] = {
141 // 2x2 singular
142 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}},
143 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}},
144 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}},
145 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}},
146 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}},
147 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}},
148 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}},
149 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}},
150 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}},
151 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 .
152 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}},
153 };
154
155 for (const auto& testCase : testCases) {
156 font.setSize(testCase.textSize);
157 const SkScalar(&m)[9] = testCase.matrix;
158 SkMatrix mat;
159 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]);
160 canvas->setMatrix(mat);
161 canvas->drawString("Hamburgefons", 10, 10, font, SkPaint());
162 }
163 }
164