aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/DrawTextTest.cpp
blob: a98b36f3210248e69954e03448eb345f95428e28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkPaint.h"
#include "SkPoint.h"
#include "SkRect.h"
#include "SkSurface.h"
#include "SkTypes.h"
#include "Test.h"
#include <math.h>

static const SkColor bgColor = SK_ColorWHITE;

static void create(SkBitmap* bm, SkIRect bound) {
    bm->allocN32Pixels(bound.width(), bound.height());
}

static void drawBG(SkCanvas* canvas) {
    canvas->drawColor(bgColor);
}

/** Assumes that the ref draw was completely inside ref canvas --
    implies that everything outside is "bgColor".
    Checks that all overlap is the same and that all non-overlap on the
    ref is "bgColor".
 */
static bool compare(const SkBitmap& ref, const SkIRect& iref,
                    const SkBitmap& test, const SkIRect& itest)
{
    const int xOff = itest.fLeft - iref.fLeft;
    const int yOff = itest.fTop - iref.fTop;

    for (int y = 0; y < test.height(); ++y) {
        for (int x = 0; x < test.width(); ++x) {
            SkColor testColor = test.getColor(x, y);
            int refX = x + xOff;
            int refY = y + yOff;
            SkColor refColor;
            if (refX >= 0 && refX < ref.width() &&
                refY >= 0 && refY < ref.height())
            {
                refColor = ref.getColor(refX, refY);
            } else {
                refColor = bgColor;
            }
            if (refColor != testColor) {
                return false;
            }
        }
    }
    return true;
}

DEF_TEST(DrawText, reporter) {
    SkPaint paint;
    paint.setColor(SK_ColorGRAY);
    paint.setTextSize(SkIntToScalar(20));

    SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
    SkBitmap drawTextBitmap;
    create(&drawTextBitmap, drawTextRect);
    SkCanvas drawTextCanvas(drawTextBitmap);

    SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
    SkBitmap drawPosTextBitmap;
    create(&drawPosTextBitmap, drawPosTextRect);
    SkCanvas drawPosTextCanvas(drawPosTextBitmap);

    // Two test cases "A" for the normal path through the code, and " " to check the
    // early return path.
    const char* cases[] = {"A", " "};
    for (auto c : cases) {
        for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
            for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
                SkPoint point = SkPoint::Make(25.0f + offsetX,
                                              25.0f + offsetY);

                for (int align = 0; align < SkPaint::kAlignCount; ++align) {
                    paint.setTextAlign(static_cast<SkPaint::Align>(align));

                    for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
                        static const unsigned int antiAliasFlag = 1;
                        static const unsigned int subpixelFlag = 1 << 1;
                        static const unsigned int lcdFlag = 1 << 2;

                        paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
                        paint.setSubpixelText(SkToBool(flags & subpixelFlag));
                        paint.setLCDRenderText(SkToBool(flags & lcdFlag));

                        // Test: drawText and drawPosText draw the same.
                        drawBG(&drawTextCanvas);
                        drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint);

                        drawBG(&drawPosTextCanvas);
                        drawPosTextCanvas.drawPosText(c, 1, &point, paint);

                        REPORTER_ASSERT(reporter,
                                        compare(drawTextBitmap, drawTextRect,
                                                drawPosTextBitmap, drawPosTextRect));
                    }
                }
            }
        }
    }
}

// Test drawing text at some unusual coordinates.
// We measure success by not crashing or asserting.
DEF_TEST(DrawText_weirdCoordinates, r) {
    auto surface = SkSurface::MakeRasterN32Premul(10,10);
    auto canvas = surface->getCanvas();

    SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f };

    for (auto x : oddballs) {
        canvas->drawText("a", 1, +x, 0.0f, SkPaint());
        canvas->drawText("a", 1, -x, 0.0f, SkPaint());
    }
    for (auto y : oddballs) {
        canvas->drawText("a", 1, 0.0f, +y, SkPaint());
        canvas->drawText("a", 1, 0.0f, -y, SkPaint());
    }
}