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 "SkBitmap.h"
9 #include "SkCanvas.h"
10 #include "SkColor.h"
11 #include "SkPaint.h"
12 #include "SkPoint.h"
13 #include "SkRect.h"
14 #include "SkSurface.h"
15 #include "SkTypes.h"
16 #include "Test.h"
17 #include <math.h>
18
19 static const SkColor bgColor = SK_ColorWHITE;
20
create(SkBitmap * bm,SkIRect bound)21 static void create(SkBitmap* bm, SkIRect bound) {
22 bm->allocN32Pixels(bound.width(), bound.height());
23 }
24
drawBG(SkCanvas * canvas)25 static void drawBG(SkCanvas* canvas) {
26 canvas->drawColor(bgColor);
27 }
28
29 /** Assumes that the ref draw was completely inside ref canvas --
30 implies that everything outside is "bgColor".
31 Checks that all overlap is the same and that all non-overlap on the
32 ref is "bgColor".
33 */
compare(const SkBitmap & ref,const SkIRect & iref,const SkBitmap & test,const SkIRect & itest)34 static bool compare(const SkBitmap& ref, const SkIRect& iref,
35 const SkBitmap& test, const SkIRect& itest)
36 {
37 const int xOff = itest.fLeft - iref.fLeft;
38 const int yOff = itest.fTop - iref.fTop;
39
40 for (int y = 0; y < test.height(); ++y) {
41 for (int x = 0; x < test.width(); ++x) {
42 SkColor testColor = test.getColor(x, y);
43 int refX = x + xOff;
44 int refY = y + yOff;
45 SkColor refColor;
46 if (refX >= 0 && refX < ref.width() &&
47 refY >= 0 && refY < ref.height())
48 {
49 refColor = ref.getColor(refX, refY);
50 } else {
51 refColor = bgColor;
52 }
53 if (refColor != testColor) {
54 return false;
55 }
56 }
57 }
58 return true;
59 }
60
DEF_TEST(DrawText,reporter)61 DEF_TEST(DrawText, reporter) {
62 SkPaint paint;
63 paint.setColor(SK_ColorGRAY);
64 paint.setTextSize(SkIntToScalar(20));
65
66 SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
67 SkBitmap drawTextBitmap;
68 create(&drawTextBitmap, drawTextRect);
69 SkCanvas drawTextCanvas(drawTextBitmap);
70
71 SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
72 SkBitmap drawPosTextBitmap;
73 create(&drawPosTextBitmap, drawPosTextRect);
74 SkCanvas drawPosTextCanvas(drawPosTextBitmap);
75
76 // Two test cases "A" for the normal path through the code, and " " to check the
77 // early return path.
78 const char* cases[] = {"A", " "};
79 for (auto c : cases) {
80 for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
81 for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
82 SkPoint point = SkPoint::Make(25.0f + offsetX,
83 25.0f + offsetY);
84
85 for (int align = 0; align < SkPaint::kAlignCount; ++align) {
86 paint.setTextAlign(static_cast<SkPaint::Align>(align));
87
88 for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
89 static const unsigned int antiAliasFlag = 1;
90 static const unsigned int subpixelFlag = 1 << 1;
91 static const unsigned int lcdFlag = 1 << 2;
92
93 paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
94 paint.setSubpixelText(SkToBool(flags & subpixelFlag));
95 paint.setLCDRenderText(SkToBool(flags & lcdFlag));
96
97 // Test: drawText and drawPosText draw the same.
98 drawBG(&drawTextCanvas);
99 drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint);
100
101 drawBG(&drawPosTextCanvas);
102 drawPosTextCanvas.drawPosText(c, 1, &point, paint);
103
104 REPORTER_ASSERT(reporter,
105 compare(drawTextBitmap, drawTextRect,
106 drawPosTextBitmap, drawPosTextRect));
107 }
108 }
109 }
110 }
111 }
112 }
113
114 // Test drawing text at some unusual coordinates.
115 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates,r)116 DEF_TEST(DrawText_weirdCoordinates, r) {
117 auto surface = SkSurface::MakeRasterN32Premul(10,10);
118 auto canvas = surface->getCanvas();
119
120 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
121
122 for (auto x : oddballs) {
123 canvas->drawString("a", +x, 0.0f, SkPaint());
124 canvas->drawString("a", -x, 0.0f, SkPaint());
125 }
126 for (auto y : oddballs) {
127 canvas->drawString("a", 0.0f, +y, SkPaint());
128 canvas->drawString("a", 0.0f, -y, SkPaint());
129 }
130 }
131
132 // Test drawing text with some unusual matricies.
133 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdMatricies,r)134 DEF_TEST(DrawText_weirdMatricies, r) {
135 auto surface = SkSurface::MakeRasterN32Premul(100,100);
136 auto canvas = surface->getCanvas();
137
138 SkPaint paint;
139 paint.setAntiAlias(true);
140 paint.setLCDRenderText(true);
141
142 struct {
143 SkScalar textSize;
144 SkScalar matrix[9];
145 } testCases[] = {
146 // 2x2 singular
147 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}},
148 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}},
149 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}},
150 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}},
151 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}},
152 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}},
153 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}},
154 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}},
155 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}},
156 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 .
157 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}},
158 };
159
160 for (const auto& testCase : testCases) {
161 paint.setTextSize(testCase.textSize);
162 const SkScalar(&m)[9] = testCase.matrix;
163 SkMatrix mat;
164 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]);
165 canvas->setMatrix(mat);
166 canvas->drawString("Hamburgefons", 10, 10, paint);
167 }
168 }
169