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 "gm.h"
9#include "sk_tool_utils.h"
10#include "SkBlurMask.h"
11#include "SkBlurMaskFilter.h"
12#include "SkReadBuffer.h"
13#include "SkTextBlob.h"
14#include "SkWriteBuffer.h"
15#include "SkLayerRasterizer.h"
16
17static void r0(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
18    p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
19                                           SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
20    rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
21
22    p.setMaskFilter(nullptr);
23    p.setStyle(SkPaint::kStroke_Style);
24    p.setStrokeWidth(SK_Scalar1);
25    rastBuilder->addLayer(p);
26
27    p.setAlpha(0x11);
28    p.setStyle(SkPaint::kFill_Style);
29    p.setBlendMode(SkBlendMode::kSrc);
30    rastBuilder->addLayer(p);
31}
32
33static void r1(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
34    rastBuilder->addLayer(p);
35
36    p.setAlpha(0x40);
37    p.setBlendMode(SkBlendMode::kSrc);
38    p.setStyle(SkPaint::kStroke_Style);
39    p.setStrokeWidth(SK_Scalar1*2);
40    rastBuilder->addLayer(p);
41}
42
43static void r2(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
44    p.setStyle(SkPaint::kStrokeAndFill_Style);
45    p.setStrokeWidth(SK_Scalar1*4);
46    rastBuilder->addLayer(p);
47
48    p.setStyle(SkPaint::kStroke_Style);
49    p.setStrokeWidth(SK_Scalar1*3/2);
50    p.setBlendMode(SkBlendMode::kClear);
51    rastBuilder->addLayer(p);
52}
53
54static void r3(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
55    p.setStyle(SkPaint::kStroke_Style);
56    p.setStrokeWidth(SK_Scalar1*3);
57    rastBuilder->addLayer(p);
58
59    p.setAlpha(0x20);
60    p.setStyle(SkPaint::kFill_Style);
61    p.setBlendMode(SkBlendMode::kSrc);
62    rastBuilder->addLayer(p);
63}
64
65static void r4(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
66    p.setAlpha(0x60);
67    rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
68
69    p.setAlpha(0xFF);
70    p.setBlendMode(SkBlendMode::kClear);
71    rastBuilder->addLayer(p, SK_Scalar1*3/2, SK_Scalar1*3/2);
72
73    p.setBlendMode(SkBlendMode::kSrcOver);
74    rastBuilder->addLayer(p);
75}
76
77#include "SkDiscretePathEffect.h"
78
79static void r5(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
80    rastBuilder->addLayer(p);
81
82    p.setPathEffect(SkDiscretePathEffect::Make(SK_Scalar1*4, SK_Scalar1*3));
83    p.setBlendMode(SkBlendMode::kSrcOut);
84    rastBuilder->addLayer(p);
85}
86
87static void r6(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
88    rastBuilder->addLayer(p);
89
90    p.setAntiAlias(false);
91    SkLayerRasterizer::Builder rastBuilder2;
92    r5(&rastBuilder2, p);
93    p.setRasterizer(rastBuilder2.detach());
94    p.setBlendMode(SkBlendMode::kClear);
95    rastBuilder->addLayer(p);
96}
97
98#include "Sk2DPathEffect.h"
99
100static sk_sp<SkPathEffect> MakeDotEffect(SkScalar radius, const SkMatrix& matrix) {
101    SkPath path;
102    path.addCircle(0, 0, radius);
103    return SkPath2DPathEffect::Make(matrix, path);
104}
105
106static void r7(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
107    SkMatrix    lattice;
108    lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
109    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
110    p.setPathEffect(MakeDotEffect(SK_Scalar1*4, lattice));
111    rastBuilder->addLayer(p);
112}
113
114static void r8(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
115    rastBuilder->addLayer(p);
116
117    SkMatrix    lattice;
118    lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
119    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
120    p.setPathEffect(MakeDotEffect(SK_Scalar1*2, lattice));
121    p.setBlendMode(SkBlendMode::kClear);
122    rastBuilder->addLayer(p);
123
124    p.setPathEffect(nullptr);
125    p.setBlendMode(SkBlendMode::kSrcOver);
126    p.setStyle(SkPaint::kStroke_Style);
127    p.setStrokeWidth(SK_Scalar1);
128    rastBuilder->addLayer(p);
129}
130
131static void r9(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
132    rastBuilder->addLayer(p);
133
134    SkMatrix    lattice;
135    lattice.setScale(SK_Scalar1, SK_Scalar1*6, 0, 0);
136    lattice.postRotate(SkIntToScalar(30), 0, 0);
137    p.setPathEffect(SkLine2DPathEffect::Make(SK_Scalar1*2, lattice));
138    p.setBlendMode(SkBlendMode::kClear);
139    rastBuilder->addLayer(p);
140
141    p.setPathEffect(nullptr);
142    p.setBlendMode(SkBlendMode::kSrcOver);
143    p.setStyle(SkPaint::kStroke_Style);
144    p.setStrokeWidth(SK_Scalar1);
145    rastBuilder->addLayer(p);
146}
147
148typedef void (*raster_proc)(SkLayerRasterizer::Builder*, SkPaint&);
149
150constexpr raster_proc gRastProcs[] = {
151    r0, r1, r2, r3, r4, r5, r6, r7, r8, r9
152};
153
154static void apply_shader(SkPaint* paint, int index) {
155    raster_proc proc = gRastProcs[index];
156    if (proc) {
157        SkPaint p;
158        SkLayerRasterizer::Builder rastBuilder;
159
160        p.setAntiAlias(true);
161        proc(&rastBuilder, p);
162        paint->setRasterizer(rastBuilder.detach());
163    }
164
165#if 0
166    SkScalar dir[] = { SK_Scalar1, SK_Scalar1, SK_Scalar1 };
167    paint->setMaskFilter(SkBlurMaskFilter::CreateEmboss(dir, SK_Scalar1/4, SkIntToScalar(4), SkIntToScalar(3)))->unref();
168#endif
169    paint->setColor(SK_ColorBLUE);
170}
171
172DEF_SIMPLE_GM(texteffects, canvas, 460, 680) {
173        canvas->save();
174
175        SkPaint     paint;
176        paint.setAntiAlias(true);
177        sk_tool_utils::set_portable_typeface(&paint);
178        paint.setTextSize(SkIntToScalar(56));
179
180        SkScalar    x = SkIntToScalar(20);
181        SkScalar    y = paint.getTextSize();
182
183        SkString str("Hamburgefons");
184
185        for (int i = 0; i < static_cast<int>(SK_ARRAY_COUNT(gRastProcs)); i++) {
186            apply_shader(&paint, i);
187
188            //  paint.setMaskFilter(nullptr);
189            //  paint.setColor(SK_ColorBLACK);
190
191            canvas->drawText(str.c_str(), str.size(), x, y, paint);
192
193            y += paint.getFontSpacing();
194        }
195
196        canvas->restore();
197}
198
199static SkPath create_underline(const SkTDArray<SkScalar>& intersections,
200        SkScalar last, SkScalar finalPos,
201        SkScalar uPos, SkScalar uWidth, SkScalar textSize) {
202    SkPath underline;
203    SkScalar end = last;
204    for (int index = 0; index < intersections.count(); index += 2) {
205        SkScalar start = intersections[index] - uWidth;;
206        end = intersections[index + 1] + uWidth;
207        if (start > last && last + textSize / 12 < start) {
208            underline.moveTo(last, uPos);
209            underline.lineTo(start, uPos);
210        }
211        last = end;
212    }
213    if (end < finalPos) {
214        underline.moveTo(end, uPos);
215        underline.lineTo(finalPos, uPos);
216    }
217    return underline;
218}
219
220static void find_intercepts(const char* test, size_t len, SkScalar x, SkScalar y,
221        const SkPaint& paint, SkScalar uWidth, SkTDArray<SkScalar>* intersections) {
222    SkScalar uPos = y + uWidth;
223    SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
224    int count = paint.getTextIntercepts(test, len, x, y, bounds, nullptr);
225    SkASSERT(!(count % 2));
226    if (count) {
227        intersections->setCount(count);
228        paint.getTextIntercepts(test, len, x, y, bounds, intersections->begin());
229    }
230}
231
232DEF_SIMPLE_GM(fancyunderline, canvas, 900, 1350) {
233    SkPaint paint;
234    paint.setAntiAlias(true);
235    const char* fam[] = { "sans-serif", "serif", "monospace" };
236    const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
237    SkPoint textPt = { 10, 80 };
238    for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
239        sk_tool_utils::set_portable_typeface(&paint, fam[font]);
240        for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
241            paint.setTextSize(textSize);
242            const SkScalar uWidth = textSize / 15;
243            paint.setStrokeWidth(uWidth);
244            paint.setStyle(SkPaint::kFill_Style);
245            canvas->drawText(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint);
246
247            SkTDArray<SkScalar> intersections;
248            find_intercepts(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint, uWidth,
249                &intersections);
250
251            SkScalar start = textPt.fX;
252            SkScalar end = paint.measureText(test, sizeof(test) - 1) + textPt.fX;
253            SkScalar uPos = textPt.fY + uWidth;
254            SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
255            paint.setStyle(SkPaint::kStroke_Style);
256            canvas->drawPath(underline, paint);
257
258            canvas->translate(0, textSize * 1.3f);
259        }
260        canvas->translate(0, 60);
261    }
262}
263
264static void find_intercepts(const char* test, size_t len, const SkPoint* pos, const SkPaint& paint,
265        SkScalar uWidth, SkTDArray<SkScalar>* intersections) {
266    SkScalar uPos = pos[0].fY + uWidth;
267    SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
268    int count = paint.getPosTextIntercepts(test, len, pos, bounds, nullptr);
269    SkASSERT(!(count % 2));
270    if (count) {
271        intersections->setCount(count);
272        paint.getPosTextIntercepts(test, len, pos, bounds, intersections->begin());
273    }
274}
275
276DEF_SIMPLE_GM(fancyposunderline, canvas, 900, 1350) {
277    SkPaint paint;
278    paint.setAntiAlias(true);
279    const char* fam[] = { "sans-serif", "serif", "monospace" };
280    const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
281    SkPoint textPt = { 10, 80 };
282    for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
283        sk_tool_utils::set_portable_typeface(&paint, fam[font]);
284        for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
285            paint.setTextSize(textSize);
286            const SkScalar uWidth = textSize / 15;
287            paint.setStrokeWidth(uWidth);
288            paint.setStyle(SkPaint::kFill_Style);
289            int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr);
290            SkTDArray<SkScalar> widths;
291            widths.setCount(widthCount);
292            (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin());
293            SkTDArray<SkPoint> pos;
294            pos.setCount(widthCount);
295            SkScalar posX = textPt.fX;
296            for (int index = 0; index < widthCount; ++index) {
297                pos[index].fX = posX;
298                posX += widths[index];
299                pos[index].fY = textPt.fY + (textSize / 25) * (index % 4);
300            }
301            canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint);
302
303            SkTDArray<SkScalar> intersections;
304            find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections);
305
306            SkScalar start = textPt.fX;
307            SkScalar end = posX;
308            SkScalar uPos = textPt.fY + uWidth;
309            SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
310            paint.setStyle(SkPaint::kStroke_Style);
311            canvas->drawPath(underline, paint);
312
313            canvas->translate(0, textSize * 1.3f);
314        }
315        canvas->translate(0, 60);
316    }
317}
318
319namespace {
320
321sk_sp<SkTextBlob> MakeFancyBlob(const SkPaint& paint, const char* text) {
322    SkPaint blobPaint(paint);
323
324    const size_t textLen = strlen(text);
325    const int glyphCount = blobPaint.textToGlyphs(text, textLen, nullptr);
326    SkAutoTArray<SkGlyphID> glyphs(glyphCount);
327    blobPaint.textToGlyphs(text, textLen, glyphs.get());
328
329    blobPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
330    const size_t glyphTextBytes = SkTo<uint32_t>(glyphCount) * sizeof(SkGlyphID);
331    const int widthCount = blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, nullptr);
332    SkAssertResult(widthCount == glyphCount);
333
334    SkAutoTArray<SkScalar> widths(glyphCount);
335    blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, widths.get());
336
337    SkTextBlobBuilder blobBuilder;
338    int glyphIndex = 0;
339    SkScalar advance = 0;
340
341    // Default-positioned run.
342    {
343        const int defaultRunLen = glyphCount / 3;
344        const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRun(blobPaint,
345                                                                       defaultRunLen,
346                                                                       advance, 0);
347        memcpy(buf.glyphs, glyphs.get(), SkTo<uint32_t>(defaultRunLen) * sizeof(SkGlyphID));
348
349        for (int i = 0; i < defaultRunLen; ++i) {
350            advance += widths[glyphIndex++];
351        }
352    }
353
354    // Horizontal-positioned run.
355    {
356        const int horizontalRunLen = glyphCount / 3;
357        const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPosH(blobPaint,
358                                                                           horizontalRunLen,
359                                                                           0);
360        memcpy(buf.glyphs, glyphs.get() + glyphIndex,
361               SkTo<uint32_t>(horizontalRunLen) * sizeof(SkGlyphID));
362        for (int i = 0; i < horizontalRunLen; ++i) {
363            buf.pos[i] = advance;
364            advance += widths[glyphIndex++];
365        }
366    }
367
368    // Full-positioned run.
369    {
370        const int fullRunLen = glyphCount - glyphIndex;
371        const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPos(blobPaint, fullRunLen);
372        memcpy(buf.glyphs, glyphs.get() + glyphIndex,
373               SkTo<uint32_t>(fullRunLen) * sizeof(SkGlyphID));
374        for (int i = 0; i < fullRunLen; ++i) {
375            buf.pos[i * 2 + 0] = advance; // x offset
376            buf.pos[i * 2 + 1] = 0;       // y offset
377            advance += widths[glyphIndex++];
378        }
379    }
380
381    return blobBuilder.make();
382}
383
384} // anonymous ns
385
386DEF_SIMPLE_GM(fancyblobunderline, canvas, 1480, 1380) {
387    SkPaint paint;
388    paint.setAntiAlias(true);
389    const char* fam[] = { "sans-serif", "serif", "monospace" };
390    const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
391    const SkPoint blobOffset = { 10, 80 };
392
393    for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
394        sk_tool_utils::set_portable_typeface(&paint, fam[font]);
395        for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
396            paint.setTextSize(textSize);
397            const SkScalar uWidth = textSize / 15;
398            paint.setStrokeWidth(uWidth);
399            paint.setStyle(SkPaint::kFill_Style);
400
401            sk_sp<SkTextBlob> blob = MakeFancyBlob(paint, test);
402            canvas->drawTextBlob(blob, blobOffset.x(), blobOffset.y(), paint);
403
404            const SkScalar uPos = uWidth;
405            const SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
406            const int interceptCount = paint.getTextBlobIntercepts(blob.get(), bounds, nullptr);
407            SkASSERT(!(interceptCount % 2));
408
409            SkTDArray<SkScalar> intercepts;
410            intercepts.setCount(interceptCount);
411            paint.getTextBlobIntercepts(blob.get(), bounds, intercepts.begin());
412
413            const SkScalar start = blob->bounds().left();
414            const SkScalar end = blob->bounds().right();
415            SkPath underline = create_underline(intercepts, start, end, uPos, uWidth, textSize);
416            underline.offset(blobOffset.x(), blobOffset.y());
417            paint.setStyle(SkPaint::kStroke_Style);
418            canvas->drawPath(underline, paint);
419
420            canvas->translate(0, textSize * 1.3f);
421        }
422
423        canvas->translate(0, 60);
424    }
425}
426
427DEF_SIMPLE_GM(fancyunderlinebars, canvas, 1500, 460) {
428    SkPaint paint;
429    paint.setAntiAlias(true);
430    const char test[] = " .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_";
431    SkPoint textPt = { 10, 80 };
432    sk_tool_utils::set_portable_typeface(&paint, "serif");
433    for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
434        paint.setTextSize(textSize);
435        SkScalar uWidth = textSize / 15;
436        paint.setStrokeWidth(uWidth);
437        paint.setStyle(SkPaint::kFill_Style);
438        int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr);
439        SkTDArray<SkScalar> widths;
440        widths.setCount(widthCount);
441        (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin());
442        SkTDArray<SkPoint> pos;
443        pos.setCount(widthCount);
444        SkScalar posX = textPt.fX;
445        pos[0] = textPt;
446        posX += widths[0];
447        for (int index = 1; index < widthCount; ++index) {
448            pos[index].fX = posX;
449            posX += widths[index];
450            pos[index].fY = textPt.fY - (textSize / 50) * (index / 5) + textSize / 50 * 4;
451        }
452        canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint);
453
454        SkTDArray<SkScalar> intersections;
455        find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections);
456
457        SkScalar start = textPt.fX;
458        SkScalar end = posX;
459        SkScalar uPos = pos[0].fY + uWidth;
460        SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
461        paint.setStyle(SkPaint::kStroke_Style);
462        canvas->drawPath(underline, paint);
463        canvas->translate(0, textSize * 1.3f);
464    }
465}
466