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/SkImageInfo.h"
13 #include "include/core/SkMatrix.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkPathEffect.h" // IWYU pragma: keep
16 #include "include/core/SkPoint.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkRefCnt.h"
19 #include "include/core/SkScalar.h"
20 #include "include/core/SkSurface.h"
21 #include "include/core/SkTextBlob.h"
22 #include "include/core/SkTypeface.h"
23 #include "include/core/SkTypes.h"
24 #include "include/effects/SkDashPathEffect.h"
25 #include "tests/Test.h"
26 #include "tools/fonts/FontToolUtils.h"
27
28 #include <array>
29 #include <cmath>
30 #include <cstring>
31
32 static const SkColor bgColor = SK_ColorWHITE;
33
create(SkBitmap * bm,SkIRect bound)34 static void create(SkBitmap* bm, SkIRect bound) {
35 bm->allocN32Pixels(bound.width(), bound.height());
36 }
37
38 /** Assumes that the ref draw was completely inside ref canvas --
39 implies that everything outside is "bgColor".
40 Checks that all overlap is the same and that all non-overlap on the
41 ref is "bgColor".
42 */
compare(const SkBitmap & ref,const SkIRect & iref,const SkBitmap & test,const SkIRect & itest)43 static bool compare(const SkBitmap& ref, const SkIRect& iref,
44 const SkBitmap& test, const SkIRect& itest)
45 {
46 const int xOff = itest.fLeft - iref.fLeft;
47 const int yOff = itest.fTop - iref.fTop;
48
49 for (int y = 0; y < test.height(); ++y) {
50 for (int x = 0; x < test.width(); ++x) {
51 SkColor testColor = test.getColor(x, y);
52 int refX = x + xOff;
53 int refY = y + yOff;
54 SkColor refColor;
55 if (refX >= 0 && refX < ref.width() &&
56 refY >= 0 && refY < ref.height())
57 {
58 refColor = ref.getColor(refX, refY);
59 } else {
60 refColor = bgColor;
61 }
62 if (refColor != testColor) {
63 return false;
64 }
65 }
66 }
67 return true;
68 }
69
70 /** Test that drawing glyphs with empty paths is different from drawing glyphs without paths. */
DEF_TEST(DrawText_dashout,reporter)71 DEF_TEST(DrawText_dashout, reporter) {
72 SkIRect size = SkIRect::MakeWH(64, 64);
73
74 SkBitmap drawTextBitmap;
75 create(&drawTextBitmap, size);
76 SkCanvas drawTextCanvas(drawTextBitmap);
77
78 SkBitmap drawDashedTextBitmap;
79 create(&drawDashedTextBitmap, size);
80 SkCanvas drawDashedTextCanvas(drawDashedTextBitmap);
81
82 SkBitmap emptyBitmap;
83 create(&emptyBitmap, size);
84 SkCanvas emptyCanvas(emptyBitmap);
85
86 SkPoint point = SkPoint::Make(25.0f, 25.0f);
87 SkFont font(ToolUtils::DefaultTypeface(), 20);
88 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
89 font.setSubpixel(true);
90
91 SkPaint paint;
92 paint.setColor(SK_ColorGRAY);
93 paint.setStyle(SkPaint::kStroke_Style);
94
95 // Draw a stroked "A" without a dash which will draw something.
96 drawTextCanvas.drawColor(SK_ColorWHITE);
97 drawTextCanvas.drawString("A", point.fX, point.fY, font, paint);
98
99 // Draw an "A" but with a dash which will never draw anything.
100 paint.setStrokeWidth(2);
101 constexpr SkScalar bigInterval = 10000;
102 static constexpr SkScalar intervals[] = { 1, bigInterval };
103 paint.setPathEffect(SkDashPathEffect::Make(intervals, std::size(intervals), 2));
104
105 drawDashedTextCanvas.drawColor(SK_ColorWHITE);
106 drawDashedTextCanvas.drawString("A", point.fX, point.fY, font, paint);
107
108 // Draw nothing.
109 emptyCanvas.drawColor(SK_ColorWHITE);
110
111 REPORTER_ASSERT(reporter, !compare(drawTextBitmap, size, emptyBitmap, size));
112 REPORTER_ASSERT(reporter, compare(drawDashedTextBitmap, size, emptyBitmap, size));
113 }
114
115 // Test drawing text at some unusual coordinates.
116 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates,r)117 DEF_TEST(DrawText_weirdCoordinates, r) {
118 auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(10, 10));
119 auto canvas = surface->getCanvas();
120 SkFont font = ToolUtils::DefaultFont();
121
122 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
123
124 for (auto x : oddballs) {
125 canvas->drawString("a", +x, 0.0f, font, SkPaint());
126 canvas->drawString("a", -x, 0.0f, font, SkPaint());
127 }
128 for (auto y : oddballs) {
129 canvas->drawString("a", 0.0f, +y, font, SkPaint());
130 canvas->drawString("a", 0.0f, -y, font, SkPaint());
131 }
132 }
133
134 // Test drawing text with some unusual matrices.
135 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdMatricies,r)136 DEF_TEST(DrawText_weirdMatricies, r) {
137 auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(100, 100));
138 auto canvas = surface->getCanvas();
139
140 SkFont font = ToolUtils::DefaultFont();
141 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
142
143 struct {
144 SkScalar textSize;
145 SkScalar matrix[9];
146 } testCases[] = {
147 // 2x2 singular
148 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}},
149 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}},
150 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}},
151 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}},
152 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}},
153 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}},
154 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}},
155 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}},
156 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}},
157 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 .
158 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}},
159 };
160
161 for (const auto& testCase : testCases) {
162 font.setSize(testCase.textSize);
163 const SkScalar(&m)[9] = testCase.matrix;
164 SkMatrix mat;
165 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]);
166 canvas->setMatrix(mat);
167 canvas->drawString("Hamburgefons", 10, 10, font, SkPaint());
168 }
169 }
170
171 // This produces no glyphs, and is to check that buffers from previous draws don't get
172 // reused.
DEF_TEST(DrawText_noglyphs,r)173 DEF_TEST(DrawText_noglyphs, r) {
174 auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(100, 100));
175 auto canvas = surface->getCanvas();
176 SkFont font = ToolUtils::DefaultFont();
177 auto text = "Hamburgfons";
178 {
179 // scoped to ensure blob is deleted.
180 auto blob = SkTextBlob::MakeFromText(text, strlen(text), font);
181 canvas->drawTextBlob(blob, 10, 10, SkPaint());
182 }
183 canvas->drawString(
184 "\x0d\xf3\xf2\xf2\xe9\x0d\x0d\x0d\x05\x0d\x0d\xe3\xe3\xe3\xe3\xe3\xe3\xe3\xe3\xe3",
185 10, 20, font, SkPaint());
186 }
187