DrawTextTest.cpp revision 386127f1d431ef64bf655f39994f17daadfb5269 
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 "SkTypes.h"
15#include "Test.h"
16
17static const SkColor bgColor = SK_ColorWHITE;
18
19static void create(SkBitmap* bm, SkIRect bound) {
20    bm->allocN32Pixels(bound.width(), bound.height());
21}
22
23static void drawBG(SkCanvas* canvas) {
24    canvas->drawColor(bgColor);
25}
26
27/** Assumes that the ref draw was completely inside ref canvas --
28    implies that everything outside is "bgColor".
29    Checks that all overlap is the same and that all non-overlap on the
30    ref is "bgColor".
31 */
32static bool compare(const SkBitmap& ref, const SkIRect& iref,
33                    const SkBitmap& test, const SkIRect& itest)
34{
35    const int xOff = itest.fLeft - iref.fLeft;
36    const int yOff = itest.fTop - iref.fTop;
37
38    SkAutoLockPixels alpRef(ref);
39    SkAutoLockPixels alpTest(test);
40
41    for (int y = 0; y < test.height(); ++y) {
42        for (int x = 0; x < test.width(); ++x) {
43            SkColor testColor = test.getColor(x, y);
44            int refX = x + xOff;
45            int refY = y + yOff;
46            SkColor refColor;
47            if (refX >= 0 && refX < ref.width() &&
48                refY >= 0 && refY < ref.height())
49            {
50                refColor = ref.getColor(refX, refY);
51            } else {
52                refColor = bgColor;
53            }
54            if (refColor != testColor) {
55                return false;
56            }
57        }
58    }
59    return true;
60}
61
62DEF_TEST(DrawText, reporter) {
63    SkPaint paint;
64    paint.setColor(SK_ColorGRAY);
65    paint.setTextSize(SkIntToScalar(20));
66
67    SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
68    SkBitmap drawTextBitmap;
69    create(&drawTextBitmap, drawTextRect);
70    SkCanvas drawTextCanvas(drawTextBitmap);
71
72    SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
73    SkBitmap drawPosTextBitmap;
74    create(&drawPosTextBitmap, drawPosTextRect);
75    SkCanvas drawPosTextCanvas(drawPosTextBitmap);
76
77    // Two test cases "A" for the normal path through the code, and " " to check the
78    // early return path.
79    const char* cases[] = {"A", " "};
80    for (auto c : cases) {
81        for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
82            for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
83                SkPoint point = SkPoint::Make(25.0f + offsetX,
84                                              25.0f + offsetY);
85
86                for (int align = 0; align < SkPaint::kAlignCount; ++align) {
87                    paint.setTextAlign(static_cast<SkPaint::Align>(align));
88
89                    for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
90                        static const unsigned int antiAliasFlag = 1;
91                        static const unsigned int subpixelFlag = 1 << 1;
92                        static const unsigned int lcdFlag = 1 << 2;
93
94                        paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
95                        paint.setSubpixelText(SkToBool(flags & subpixelFlag));
96                        paint.setLCDRenderText(SkToBool(flags & lcdFlag));
97
98                        // Test: drawText and drawPosText draw the same.
99                        drawBG(&drawTextCanvas);
100                        drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint);
101
102                        drawBG(&drawPosTextCanvas);
103                        drawPosTextCanvas.drawPosText(c, 1, &point, paint);
104
105                        REPORTER_ASSERT(reporter,
106                                        compare(drawTextBitmap, drawTextRect,
107                                                drawPosTextBitmap, drawPosTextRect));
108                    }
109                }
110            }
111        }
112    }
113}
114