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" // IWYU pragma: keep
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/SkTextBlob.h"
21 #include "include/core/SkTypeface.h"
22 #include "include/core/SkTypes.h"
23 #include "include/effects/SkDashPathEffect.h"
24 #include "tests/Test.h"
25
26 #include <cmath>
27 #include <string>
28
29 static const SkColor bgColor = SK_ColorWHITE;
30
create(SkBitmap * bm,SkIRect bound)31 static void create(SkBitmap* bm, SkIRect bound) {
32 bm->allocN32Pixels(bound.width(), bound.height());
33 }
34
35 /** Assumes that the ref draw was completely inside ref canvas --
36 implies that everything outside is "bgColor".
37 Checks that all overlap is the same and that all non-overlap on the
38 ref is "bgColor".
39 */
compare(const SkBitmap & ref,const SkIRect & iref,const SkBitmap & test,const SkIRect & itest)40 static bool compare(const SkBitmap& ref, const SkIRect& iref,
41 const SkBitmap& test, const SkIRect& itest)
42 {
43 const int xOff = itest.fLeft - iref.fLeft;
44 const int yOff = itest.fTop - iref.fTop;
45
46 for (int y = 0; y < test.height(); ++y) {
47 for (int x = 0; x < test.width(); ++x) {
48 SkColor testColor = test.getColor(x, y);
49 int refX = x + xOff;
50 int refY = y + yOff;
51 SkColor refColor;
52 if (refX >= 0 && refX < ref.width() &&
53 refY >= 0 && refY < ref.height())
54 {
55 refColor = ref.getColor(refX, refY);
56 } else {
57 refColor = bgColor;
58 }
59 if (refColor != testColor) {
60 return false;
61 }
62 }
63 }
64 return true;
65 }
66
67 /** Test that drawing glyphs with empty paths is different from drawing glyphs without paths. */
DEF_TEST(DrawText_dashout,reporter)68 DEF_TEST(DrawText_dashout, reporter) {
69 SkIRect size = SkIRect::MakeWH(64, 64);
70
71 SkBitmap drawTextBitmap;
72 create(&drawTextBitmap, size);
73 SkCanvas drawTextCanvas(drawTextBitmap);
74
75 SkBitmap drawDashedTextBitmap;
76 create(&drawDashedTextBitmap, size);
77 SkCanvas drawDashedTextCanvas(drawDashedTextBitmap);
78
79 SkBitmap emptyBitmap;
80 create(&emptyBitmap, size);
81 SkCanvas emptyCanvas(emptyBitmap);
82
83 SkPoint point = SkPoint::Make(25.0f, 25.0f);
84 SkFont font(nullptr, 20);
85 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
86 font.setSubpixel(true);
87
88 SkPaint paint;
89 paint.setColor(SK_ColorGRAY);
90 paint.setStyle(SkPaint::kStroke_Style);
91
92 // Draw a stroked "A" without a dash which will draw something.
93 drawTextCanvas.drawColor(SK_ColorWHITE);
94 drawTextCanvas.drawString("A", point.fX, point.fY, font, paint);
95
96 // Draw an "A" but with a dash which will never draw anything.
97 paint.setStrokeWidth(2);
98 constexpr SkScalar bigInterval = 10000;
99 static constexpr SkScalar intervals[] = { 1, bigInterval };
100 paint.setPathEffect(SkDashPathEffect::Make(intervals, std::size(intervals), 2));
101
102 drawDashedTextCanvas.drawColor(SK_ColorWHITE);
103 drawDashedTextCanvas.drawString("A", point.fX, point.fY, font, paint);
104
105 // Draw nothing.
106 emptyCanvas.drawColor(SK_ColorWHITE);
107
108 REPORTER_ASSERT(reporter, !compare(drawTextBitmap, size, emptyBitmap, size));
109 REPORTER_ASSERT(reporter, compare(drawDashedTextBitmap, size, emptyBitmap, size));
110 }
111
112 // Test drawing text at some unusual coordinates.
113 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates,r)114 DEF_TEST(DrawText_weirdCoordinates, r) {
115 auto surface = SkSurface::MakeRasterN32Premul(10,10);
116 auto canvas = surface->getCanvas();
117
118 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
119
120 for (auto x : oddballs) {
121 canvas->drawString("a", +x, 0.0f, SkFont(), SkPaint());
122 canvas->drawString("a", -x, 0.0f, SkFont(), SkPaint());
123 }
124 for (auto y : oddballs) {
125 canvas->drawString("a", 0.0f, +y, SkFont(), SkPaint());
126 canvas->drawString("a", 0.0f, -y, SkFont(), SkPaint());
127 }
128 }
129
130 // Test drawing text with some unusual matricies.
131 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdMatricies,r)132 DEF_TEST(DrawText_weirdMatricies, r) {
133 auto surface = SkSurface::MakeRasterN32Premul(100,100);
134 auto canvas = surface->getCanvas();
135
136 SkFont font;
137 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
138
139 struct {
140 SkScalar textSize;
141 SkScalar matrix[9];
142 } testCases[] = {
143 // 2x2 singular
144 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}},
145 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}},
146 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}},
147 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}},
148 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}},
149 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}},
150 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}},
151 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}},
152 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}},
153 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 .
154 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}},
155 };
156
157 for (const auto& testCase : testCases) {
158 font.setSize(testCase.textSize);
159 const SkScalar(&m)[9] = testCase.matrix;
160 SkMatrix mat;
161 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]);
162 canvas->setMatrix(mat);
163 canvas->drawString("Hamburgefons", 10, 10, font, SkPaint());
164 }
165 }
166
167 // This produces no glyphs, and is to check that buffers from previous draws don't get
168 // reused.
DEF_TEST(DrawText_noglyphs,r)169 DEF_TEST(DrawText_noglyphs, r) {
170 auto surface = SkSurface::MakeRasterN32Premul(100,100);
171 auto canvas = surface->getCanvas();
172 auto text = "Hamburgfons";
173 {
174 // scoped to ensure blob is deleted.
175 auto blob = SkTextBlob::MakeFromText(text, strlen(text), SkFont());
176 canvas->drawTextBlob(blob, 10, 10, SkPaint());
177 }
178 canvas->drawString(
179 "\x0d\xf3\xf2\xf2\xe9\x0d\x0d\x0d\x05\x0d\x0d\xe3\xe3\xe3\xe3\xe3\xe3\xe3\xe3\xe3",
180 10, 20, SkFont(), SkPaint());
181 }
182