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 "SkBlurMask.h"
9#include "SkBlurMaskFilter.h"
10#include "SkLayerDrawLooper.h"
11#include "SkPaint.h"
12#include "SkPath.h"
13#include "SkRandom.h"
14#include "SkReadBuffer.h"
15#include "SkTypeface.h"
16#include "SkUtils.h"
17#include "SkWriteBuffer.h"
18#include "SkXfermode.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::RefDefault())->unref();
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    SkLayerDrawLooper* looper = looperBuilder.detachLooper();
150    paint.setLooper(looper)->unref();
151    SkMaskFilter* mask = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
152                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)));
153    paint.setMaskFilter(mask)->unref();
154
155    // copy the paint using the copy constructor and check they are the same
156    SkPaint copiedPaint = paint;
157    REPORTER_ASSERT(reporter, paint == copiedPaint);
158
159    // copy the paint using the equal operator and check they are the same
160    copiedPaint = paint;
161    REPORTER_ASSERT(reporter, paint == copiedPaint);
162
163    // clean the paint and check they are back to their initial states
164    SkPaint cleanPaint;
165    paint.reset();
166    copiedPaint.reset();
167    REPORTER_ASSERT(reporter, cleanPaint == paint);
168    REPORTER_ASSERT(reporter, cleanPaint == copiedPaint);
169}
170
171// found and fixed for webkit: mishandling when we hit recursion limit on
172// mostly degenerate cubic flatness test
173DEF_TEST(Paint_regression_cubic, reporter) {
174    SkPath path, stroke;
175    SkPaint paint;
176
177    path.moveTo(460.2881309415525f,
178                303.250847066498f);
179    path.cubicTo(463.36378422175284f,
180                 302.1169735073363f,
181                 456.32239330810046f,
182                 304.720354932878f,
183                 453.15255460013304f,
184                 305.788586869862f);
185
186    SkRect fillR, strokeR;
187    fillR = path.getBounds();
188
189    paint.setStyle(SkPaint::kStroke_Style);
190    paint.setStrokeWidth(SkIntToScalar(2));
191    paint.getFillPath(path, &stroke);
192    strokeR = stroke.getBounds();
193
194    SkRect maxR = fillR;
195    SkScalar miter = SkMaxScalar(SK_Scalar1, paint.getStrokeMiter());
196    SkScalar inset = paint.getStrokeJoin() == SkPaint::kMiter_Join ?
197                            SkScalarMul(paint.getStrokeWidth(), miter) :
198                            paint.getStrokeWidth();
199    maxR.inset(-inset, -inset);
200
201    // test that our stroke didn't explode
202    REPORTER_ASSERT(reporter, maxR.contains(strokeR));
203}
204
205DEF_TEST(Paint_flattening, reporter) {
206    const SkFilterQuality levels[] = {
207        kNone_SkFilterQuality,
208        kLow_SkFilterQuality,
209        kMedium_SkFilterQuality,
210        kHigh_SkFilterQuality,
211    };
212    const SkPaint::Hinting hinting[] = {
213        SkPaint::kNo_Hinting,
214        SkPaint::kSlight_Hinting,
215        SkPaint::kNormal_Hinting,
216        SkPaint::kFull_Hinting,
217    };
218    const SkPaint::Align align[] = {
219        SkPaint::kLeft_Align,
220        SkPaint::kCenter_Align,
221        SkPaint::kRight_Align
222    };
223    const SkPaint::Cap caps[] = {
224        SkPaint::kButt_Cap,
225        SkPaint::kRound_Cap,
226        SkPaint::kSquare_Cap,
227    };
228    const SkPaint::Join joins[] = {
229        SkPaint::kMiter_Join,
230        SkPaint::kRound_Join,
231        SkPaint::kBevel_Join,
232    };
233    const SkPaint::TextEncoding encodings[] = {
234        SkPaint::kUTF8_TextEncoding,
235        SkPaint::kUTF16_TextEncoding,
236        SkPaint::kUTF32_TextEncoding,
237        SkPaint::kGlyphID_TextEncoding,
238    };
239    const SkPaint::Style styles[] = {
240        SkPaint::kFill_Style,
241        SkPaint::kStroke_Style,
242        SkPaint::kStrokeAndFill_Style,
243    };
244
245#define FOR_SETUP(index, array, setter)                                 \
246    for (size_t index = 0; index < SK_ARRAY_COUNT(array); ++index) {    \
247        paint.setter(array[index]);                                     \
248
249    SkPaint paint;
250    paint.setFlags(0x1234);
251
252    FOR_SETUP(i, levels, setFilterQuality)
253    FOR_SETUP(j, hinting, setHinting)
254    FOR_SETUP(k, align, setTextAlign)
255    FOR_SETUP(l, caps, setStrokeCap)
256    FOR_SETUP(m, joins, setStrokeJoin)
257    FOR_SETUP(n, encodings, setTextEncoding)
258    FOR_SETUP(p, styles, setStyle)
259
260    SkWriteBuffer writer;
261    paint.flatten(writer);
262
263    const uint32_t* written = writer.getWriter32()->contiguousArray();
264    SkReadBuffer reader(written, writer.bytesWritten());
265
266    SkPaint paint2;
267    paint2.unflatten(reader);
268    REPORTER_ASSERT(reporter, paint2 == paint);
269
270    }}}}}}}
271#undef FOR_SETUP
272
273}
274
275// found and fixed for android: not initializing rect for string's of length 0
276DEF_TEST(Paint_regression_measureText, reporter) {
277
278    SkPaint paint;
279    paint.setTextSize(12.0f);
280
281    SkRect r;
282    r.setLTRB(SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN);
283
284    // test that the rect was reset
285    paint.measureText("", 0, &r);
286    REPORTER_ASSERT(reporter, r.isEmpty());
287}
288
289#define ASSERT(expr) REPORTER_ASSERT(r, expr)
290
291DEF_TEST(Paint_MoreFlattening, r) {
292    SkPaint paint;
293    paint.setColor(0x00AABBCC);
294    paint.setTextScaleX(1.0f);  // Default value, ignored.
295    paint.setTextSize(19);
296    paint.setXfermode(SkXfermode::Create(SkXfermode::kModulate_Mode))->unref();
297    paint.setLooper(NULL);  // Default value, ignored.
298
299    SkWriteBuffer writer;
300    paint.flatten(writer);
301
302    SkReadBuffer reader(writer.getWriter32()->contiguousArray(), writer.bytesWritten());
303    SkPaint other;
304    other.unflatten(reader);
305    ASSERT(reader.offset() == writer.bytesWritten());
306
307    // No matter the encoding, these must always hold.
308    ASSERT(other.getColor()      == paint.getColor());
309    ASSERT(other.getTextScaleX() == paint.getTextScaleX());
310    ASSERT(other.getTextSize()   == paint.getTextSize());
311    ASSERT(other.getLooper()     == paint.getLooper());
312
313    // We have to be a little looser and compare just the modes.  Pointers might not be the same.
314    SkXfermode::Mode otherMode, paintMode;
315    ASSERT(other.getXfermode()->asMode(&otherMode));
316    ASSERT(paint.getXfermode()->asMode(&paintMode));
317    ASSERT(otherMode == paintMode);
318}
319
320DEF_TEST(Paint_getHash, r) {
321    // Try not to inspect the actual hash values in here.
322    // We might want to change the hash function.
323
324    SkPaint paint;
325    const uint32_t defaultHash = paint.getHash();
326
327    // Check that some arbitrary field affects the hash.
328    paint.setColor(0xFF00FF00);
329    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
330    paint.setColor(SK_ColorBLACK);  // Reset to default value.
331    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
332
333    // SkTypeface is the first field we hash, so test it specially.
334    paint.setTypeface(SkTypeface::RefDefault())->unref();
335    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
336    paint.setTypeface(NULL);
337    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
338
339    // This is part of fBitfields, the last field we hash.
340    paint.setHinting(SkPaint::kSlight_Hinting);
341    REPORTER_ASSERT(r, paint.getHash() != defaultHash);
342    paint.setHinting(SkPaint::kNormal_Hinting);
343    REPORTER_ASSERT(r, paint.getHash() == defaultHash);
344}
345
346#include "SkColorMatrixFilter.h"
347
348DEF_TEST(Paint_nothingToDraw, r) {
349    SkPaint paint;
350
351    REPORTER_ASSERT(r, !paint.nothingToDraw());
352    paint.setAlpha(0);
353    REPORTER_ASSERT(r, paint.nothingToDraw());
354
355    paint.setAlpha(0xFF);
356    paint.setXfermodeMode(SkXfermode::kDst_Mode);
357    REPORTER_ASSERT(r, paint.nothingToDraw());
358
359    paint.setAlpha(0);
360    paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
361
362    SkColorMatrix cm;
363    cm.setIdentity();   // does not change alpha
364    paint.setColorFilter(SkColorMatrixFilter::Create(cm))->unref();
365    REPORTER_ASSERT(r, paint.nothingToDraw());
366
367    cm.postTranslate(0, 0, 0, 1);    // wacks alpha
368    paint.setColorFilter(SkColorMatrixFilter::Create(cm))->unref();
369    REPORTER_ASSERT(r, !paint.nothingToDraw());
370}
371
372