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 SkAutoLockPixels alpRef(ref);
41 SkAutoLockPixels alpTest(test);
42
43 for (int y = 0; y < test.height(); ++y) {
44 for (int x = 0; x < test.width(); ++x) {
45 SkColor testColor = test.getColor(x, y);
46 int refX = x + xOff;
47 int refY = y + yOff;
48 SkColor refColor;
49 if (refX >= 0 && refX < ref.width() &&
50 refY >= 0 && refY < ref.height())
51 {
52 refColor = ref.getColor(refX, refY);
53 } else {
54 refColor = bgColor;
55 }
56 if (refColor != testColor) {
57 return false;
58 }
59 }
60 }
61 return true;
62 }
63
DEF_TEST(DrawText,reporter)64 DEF_TEST(DrawText, reporter) {
65 SkPaint paint;
66 paint.setColor(SK_ColorGRAY);
67 paint.setTextSize(SkIntToScalar(20));
68
69 SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
70 SkBitmap drawTextBitmap;
71 create(&drawTextBitmap, drawTextRect);
72 SkCanvas drawTextCanvas(drawTextBitmap);
73
74 SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
75 SkBitmap drawPosTextBitmap;
76 create(&drawPosTextBitmap, drawPosTextRect);
77 SkCanvas drawPosTextCanvas(drawPosTextBitmap);
78
79 // Two test cases "A" for the normal path through the code, and " " to check the
80 // early return path.
81 const char* cases[] = {"A", " "};
82 for (auto c : cases) {
83 for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
84 for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
85 SkPoint point = SkPoint::Make(25.0f + offsetX,
86 25.0f + offsetY);
87
88 for (int align = 0; align < SkPaint::kAlignCount; ++align) {
89 paint.setTextAlign(static_cast<SkPaint::Align>(align));
90
91 for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
92 static const unsigned int antiAliasFlag = 1;
93 static const unsigned int subpixelFlag = 1 << 1;
94 static const unsigned int lcdFlag = 1 << 2;
95
96 paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
97 paint.setSubpixelText(SkToBool(flags & subpixelFlag));
98 paint.setLCDRenderText(SkToBool(flags & lcdFlag));
99
100 // Test: drawText and drawPosText draw the same.
101 drawBG(&drawTextCanvas);
102 drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint);
103
104 drawBG(&drawPosTextCanvas);
105 drawPosTextCanvas.drawPosText(c, 1, &point, paint);
106
107 REPORTER_ASSERT(reporter,
108 compare(drawTextBitmap, drawTextRect,
109 drawPosTextBitmap, drawPosTextRect));
110 }
111 }
112 }
113 }
114 }
115 }
116
117 // Test drawing text at some unusual coordinates.
118 // We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates,r)119 DEF_TEST(DrawText_weirdCoordinates, r) {
120 auto surface = SkSurface::MakeRasterN32Premul(10,10);
121 auto canvas = surface->getCanvas();
122
123 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };
124
125 for (auto x : oddballs) {
126 canvas->drawText("a", 1, +x, 0.0f, SkPaint());
127 canvas->drawText("a", 1, -x, 0.0f, SkPaint());
128 }
129 for (auto y : oddballs) {
130 canvas->drawText("a", 1, 0.0f, +y, SkPaint());
131 canvas->drawText("a", 1, 0.0f, -y, SkPaint());
132 }
133 }
134