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 "SkAutoMalloc.h"
9#include "SkBlurMask.h"
10#include "SkBlurMaskFilter.h"
11#include "SkLayerDrawLooper.h"
12#include "SkPaint.h"
13#include "SkPath.h"
14#include "SkRandom.h"
15#include "SkReadBuffer.h"
16#include "SkTypeface.h"
17#include "SkUtils.h"
18#include "SkWriteBuffer.h"
19#include "Test.h"
20
21static size_t uni_to_utf8(const SkUnichar src[], void* dst, int count) {
22    char* u8 = (char*)dst;
23    for (int i = 0; i < count; ++i) {
24        int n = SkToInt(SkUTF8_FromUnichar(src[i], u8));
25        u8 += n;
26    }
27    return u8 - (char*)dst;
28}
29
30static size_t uni_to_utf16(const SkUnichar src[], void* dst, int count) {
31    uint16_t* u16 = (uint16_t*)dst;
32    for (int i = 0; i < count; ++i) {
33        int n = SkToInt(SkUTF16_FromUnichar(src[i], u16));
34        u16 += n;
35    }
36    return (char*)u16 - (char*)dst;
37}
38
39static size_t uni_to_utf32(const SkUnichar src[], void* dst, int count) {
40    SkUnichar* u32 = (SkUnichar*)dst;
41    if (src != u32) {
42        memcpy(u32, src, count * sizeof(SkUnichar));
43    }
44    return count * sizeof(SkUnichar);
45}
46
47static SkTypeface::Encoding paint2encoding(const SkPaint& paint) {
48    SkPaint::TextEncoding enc = paint.getTextEncoding();
49    SkASSERT(SkPaint::kGlyphID_TextEncoding != enc);
50    return (SkTypeface::Encoding)enc;
51}
52
53static int find_first_zero(const uint16_t glyphs[], int count) {
54    for (int i = 0; i < count; ++i) {
55        if (0 == glyphs[i]) {
56            return i;
57        }
58    }
59    return count;
60}
61
62DEF_TEST(Paint_cmap, reporter) {
63    // need to implement charsToGlyphs on other backends (e.g. linux, win)
64    // before we can run this tests everywhere
65    return;
66
67    static const int NGLYPHS = 64;
68
69    SkUnichar src[NGLYPHS];
70    SkUnichar dst[NGLYPHS]; // used for utf8, utf16, utf32 storage
71
72    static const struct {
73        size_t (*fSeedTextProc)(const SkUnichar[], void* dst, int count);
74        SkPaint::TextEncoding   fEncoding;
75    } gRec[] = {
76        { uni_to_utf8,  SkPaint::kUTF8_TextEncoding },
77        { uni_to_utf16, SkPaint::kUTF16_TextEncoding },
78        { uni_to_utf32, SkPaint::kUTF32_TextEncoding },
79    };
80
81    SkRandom rand;
82    SkPaint paint;
83    paint.setTypeface(SkTypeface::MakeDefault());
84    SkTypeface* face = paint.getTypeface();
85
86    for (int i = 0; i < 1000; ++i) {
87        // generate some random text
88        for (int j = 0; j < NGLYPHS; ++j) {
89            src[j] = ' ' + j;
90        }
91        // inject some random chars, to sometimes abort early
92        src[rand.nextU() & 63] = rand.nextU() & 0xFFF;
93
94        for (size_t k = 0; k < SK_ARRAY_COUNT(gRec); ++k) {
95            paint.setTextEncoding(gRec[k].fEncoding);
96
97            size_t len = gRec[k].fSeedTextProc(src, dst, NGLYPHS);
98
99            uint16_t    glyphs0[NGLYPHS], glyphs1[NGLYPHS];
100
101            bool contains = paint.containsText(dst, len);
102            int nglyphs = paint.textToGlyphs(dst, len, glyphs0);
103            int first = face->charsToGlyphs(dst, paint2encoding(paint), glyphs1, NGLYPHS);
104            int index = find_first_zero(glyphs1, NGLYPHS);
105
106            REPORTER_ASSERT(reporter, NGLYPHS == nglyphs);
107            REPORTER_ASSERT(reporter, index == first);
108            REPORTER_ASSERT(reporter, 0 == memcmp(glyphs0, glyphs1, NGLYPHS * sizeof(uint16_t)));
109            if (contains) {
110                REPORTER_ASSERT(reporter, NGLYPHS == first);
111            } else {
112                REPORTER_ASSERT(reporter, NGLYPHS > first);
113            }
114        }
115    }
116}
117
118// temparary api for bicubic, just be sure we can set/clear it
119DEF_TEST(Paint_filterQuality, reporter) {
120    SkPaint p0, p1;
121
122    REPORTER_ASSERT(reporter, kNone_SkFilterQuality == p0.getFilterQuality());
123
124    static const SkFilterQuality gQualitys[] = {
125        kNone_SkFilterQuality,
126        kLow_SkFilterQuality,
127        kMedium_SkFilterQuality,
128        kHigh_SkFilterQuality
129    };
130    for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
131        p0.setFilterQuality(gQualitys[i]);
132        REPORTER_ASSERT(reporter, gQualitys[i] == p0.getFilterQuality());
133        p1 = p0;
134        REPORTER_ASSERT(reporter, gQualitys[i] == p1.getFilterQuality());
135
136        p0.reset();
137        REPORTER_ASSERT(reporter, kNone_SkFilterQuality == p0.getFilterQuality());
138    }
139}
140
141DEF_TEST(Paint_copy, reporter) {
142    SkPaint paint;
143    // set a few member variables
144    paint.setStyle(SkPaint::kStrokeAndFill_Style);
145    paint.setTextAlign(SkPaint::kLeft_Align);
146    paint.setStrokeWidth(SkIntToScalar(2));
147    // set a few pointers
148    SkLayerDrawLooper::Builder looperBuilder;
149    paint.setLooper(looperBuilder.detach());
150    paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
151                                               SkBlurMask::ConvertRadiusToSigma(1)));
152
153    // copy the paint using the copy constructor and check they are the same
154    SkPaint copiedPaint = paint;
155    REPORTER_ASSERT(reporter, paint == copiedPaint);
156
157    // copy the paint using the equal operator and check they are the same
158    copiedPaint = paint;
159    REPORTER_ASSERT(reporter, paint == copiedPaint);
160
161    // clean the paint and check they are back to their initial states
162    SkPaint cleanPaint;
163    paint.reset();
164    copiedPaint.reset();
165    REPORTER_ASSERT(reporter, cleanPaint == paint);
166    REPORTER_ASSERT(reporter, cleanPaint == copiedPaint);
167}
168
169// found and fixed for webkit: mishandling when we hit recursion limit on
170// mostly degenerate cubic flatness test
171DEF_TEST(Paint_regression_cubic, reporter) {
172    SkPath path, stroke;
173    SkPaint paint;
174
175    path.moveTo(460.2881309415525f,
176                303.250847066498f);
177    path.cubicTo(463.36378422175284f,
178                 302.1169735073363f,
179                 456.32239330810046f,
180                 304.720354932878f,
181                 453.15255460013304f,
182                 305.788586869862f);
183
184    SkRect fillR, strokeR;
185    fillR = path.getBounds();
186
187    paint.setStyle(SkPaint::kStroke_Style);
188    paint.setStrokeWidth(SkIntToScalar(2));
189    paint.getFillPath(path, &stroke);
190    strokeR = stroke.getBounds();
191
192    SkRect maxR = fillR;
193    SkScalar miter = SkMaxScalar(SK_Scalar1, paint.getStrokeMiter());
194    SkScalar inset = paint.getStrokeJoin() == SkPaint::kMiter_Join ?
195                            paint.getStrokeWidth() * miter :
196                            paint.getStrokeWidth();
197    maxR.inset(-inset, -inset);
198
199    // test that our stroke didn't explode
200    REPORTER_ASSERT(reporter, maxR.contains(strokeR));
201}
202
203DEF_TEST(Paint_flattening, reporter) {
204    const SkFilterQuality levels[] = {
205        kNone_SkFilterQuality,
206        kLow_SkFilterQuality,
207        kMedium_SkFilterQuality,
208        kHigh_SkFilterQuality,
209    };
210    const SkPaint::Hinting hinting[] = {
211        SkPaint::kNo_Hinting,
212        SkPaint::kSlight_Hinting,
213        SkPaint::kNormal_Hinting,
214        SkPaint::kFull_Hinting,
215    };
216    const SkPaint::Align align[] = {
217        SkPaint::kLeft_Align,
218        SkPaint::kCenter_Align,
219        SkPaint::kRight_Align
220    };
221    const SkPaint::Cap caps[] = {
222        SkPaint::kButt_Cap,
223        SkPaint::kRound_Cap,
224        SkPaint::kSquare_Cap,
225    };
226    const SkPaint::Join joins[] = {
227        SkPaint::kMiter_Join,
228        SkPaint::kRound_Join,
229        SkPaint::kBevel_Join,
230    };
231    const SkPaint::TextEncoding encodings[] = {
232        SkPaint::kUTF8_TextEncoding,
233        SkPaint::kUTF16_TextEncoding,
234        SkPaint::kUTF32_TextEncoding,
235        SkPaint::kGlyphID_TextEncoding,
236    };
237    const SkPaint::Style styles[] = {
238        SkPaint::kFill_Style,
239        SkPaint::kStroke_Style,
240        SkPaint::kStrokeAndFill_Style,
241    };
242
243#define FOR_SETUP(index, array, setter)                                 \
244    for (size_t index = 0; index < SK_ARRAY_COUNT(array); ++index) {    \
245        paint.setter(array[index]);                                     \
246
247    SkPaint paint;
248    paint.setFlags(0x1234);
249
250    FOR_SETUP(i, levels, setFilterQuality)
251    FOR_SETUP(j, hinting, setHinting)
252    FOR_SETUP(k, align, setTextAlign)
253    FOR_SETUP(l, caps, setStrokeCap)
254    FOR_SETUP(m, joins, setStrokeJoin)
255    FOR_SETUP(n, encodings, setTextEncoding)
256    FOR_SETUP(p, styles, setStyle)
257
258    SkBinaryWriteBuffer writer;
259    paint.flatten(writer);
260
261    SkAutoMalloc buf(writer.bytesWritten());
262    writer.writeToMemory(buf.get());
263    SkReadBuffer reader(buf.get(), writer.bytesWritten());
264
265    SkPaint paint2;
266    paint2.unflatten(reader);
267    REPORTER_ASSERT(reporter, paint2 == paint);
268
269    }}}}}}}
270#undef FOR_SETUP
271
272}
273
274// found and fixed for android: not initializing rect for string's of length 0
275DEF_TEST(Paint_regression_measureText, reporter) {
276
277    SkPaint paint;
278    paint.setTextSize(12.0f);
279
280    SkRect r;
281    r.setLTRB(SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN);
282
283    // test that the rect was reset
284    paint.measureText("", 0, &r);
285    REPORTER_ASSERT(reporter, r.isEmpty());
286}
287
288#define ASSERT(expr) REPORTER_ASSERT(r, expr)
289
290DEF_TEST(Paint_MoreFlattening, r) {
291    SkPaint paint;
292    paint.setColor(0x00AABBCC);
293    paint.setTextScaleX(1.0f);  // Default value, ignored.
294    paint.setTextSize(19);
295    paint.setBlendMode(SkBlendMode::kModulate);
296    paint.setLooper(nullptr);  // Default value, ignored.
297
298    SkBinaryWriteBuffer writer;
299    paint.flatten(writer);
300
301    SkAutoMalloc buf(writer.bytesWritten());
302    writer.writeToMemory(buf.get());
303    SkReadBuffer reader(buf.get(), writer.bytesWritten());
304
305    SkPaint other;
306    other.unflatten(reader);
307    ASSERT(reader.offset() == writer.bytesWritten());
308
309    // No matter the encoding, these must always hold.
310    ASSERT(other.getColor()      == paint.getColor());
311    ASSERT(other.getTextScaleX() == paint.getTextScaleX());
312    ASSERT(other.getTextSize()   == paint.getTextSize());
313    ASSERT(other.getLooper()     == paint.getLooper());
314    ASSERT(other.getBlendMode()  == paint.getBlendMode());
315}
316
317DEF_TEST(Paint_getHash, r) {
318    // Try not to inspect the actual hash values in here.
319    // We might want to change the hash function.
320
321    SkPaint paint;
322    const uint32_t defaultHash = paint.getHash();
323
324    // Check that some arbitrary field affects the hash.
325    paint.setColor(0xFF00FF00);
326    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
327    paint.setColor(SK_ColorBLACK);  // Reset to default value.
328    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
329
330    // SkTypeface is the first field we hash, so test it specially.
331    paint.setTypeface(SkTypeface::MakeDefault());
332    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
333    paint.setTypeface(nullptr);
334    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
335
336    // This is part of fBitfields, the last field we hash.
337    paint.setHinting(SkPaint::kSlight_Hinting);
338    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
339    paint.setHinting(SkPaint::kNormal_Hinting);
340    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
341}
342
343#include "SkColorMatrixFilter.h"
344
345DEF_TEST(Paint_nothingToDraw, r) {
346    SkPaint paint;
347
348    REPORTER_ASSERT(r, !paint.nothingToDraw());
349    paint.setAlpha(0);
350    REPORTER_ASSERT(r, paint.nothingToDraw());
351
352    paint.setAlpha(0xFF);
353    paint.setBlendMode(SkBlendMode::kDst);
354    REPORTER_ASSERT(r, paint.nothingToDraw());
355
356    paint.setAlpha(0);
357    paint.setBlendMode(SkBlendMode::kSrcOver);
358
359    SkColorMatrix cm;
360    cm.setIdentity();   // does not change alpha
361    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(cm.fMat));
362    REPORTER_ASSERT(r, paint.nothingToDraw());
363
364    cm.postTranslate(0, 0, 0, 1);    // wacks alpha
365    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(cm.fMat));
366    REPORTER_ASSERT(r, !paint.nothingToDraw());
367}
368