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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkColorFilter.h"
14 #include "include/core/SkFlattenable.h"
15 #include "include/core/SkFont.h"
16 #include "include/core/SkImageFilter.h"
17 #include "include/core/SkPaint.h"
18 #include "include/core/SkPoint.h"
19 #include "include/core/SkRSXform.h"
20 #include "include/core/SkRect.h"
21 #include "include/core/SkRefCnt.h"
22 #include "include/core/SkScalar.h"
23 #include "include/core/SkSize.h"
24 #include "include/core/SkString.h"
25 #include "include/core/SkTypeface.h"
26 #include "include/core/SkTypes.h"
27 #include "include/effects/SkImageFilters.h"
28 #include "include/utils/SkTextUtils.h"
29 #include "src/core/SkImageFilter_Base.h"
30 #include "src/core/SkSpecialImage.h"
31 #include "src/utils/SkPatchUtils.h"
32 #include "tools/ToolUtils.h"
33
34 #include <utility>
35
36 class SkReadBuffer;
37
38 class FailImageFilter : public SkImageFilter_Base {
39 public:
Make()40 static sk_sp<SkImageFilter> Make() {
41 return sk_sp<SkImageFilter>(new FailImageFilter);
42 }
43
44 SK_FLATTENABLE_HOOKS(FailImageFilter)
45 protected:
FailImageFilter()46 FailImageFilter() : INHERITED(nullptr, 0, nullptr) {}
47
onFilterImage(const Context &,SkIPoint * offset) const48 sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override {
49 return nullptr;
50 }
51
52 private:
53
54 using INHERITED = SkImageFilter_Base;
55 };
56
CreateProc(SkReadBuffer & buffer)57 sk_sp<SkFlattenable> FailImageFilter::CreateProc(SkReadBuffer& buffer) {
58 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
59 return FailImageFilter::Make();
60 }
61
62 class IdentityImageFilter : public SkImageFilter_Base {
63 public:
Make(sk_sp<SkImageFilter> input)64 static sk_sp<SkImageFilter> Make(sk_sp<SkImageFilter> input) {
65 return sk_sp<SkImageFilter>(new IdentityImageFilter(std::move(input)));
66 }
67
68
69 SK_FLATTENABLE_HOOKS(IdentityImageFilter)
70 protected:
onFilterImage(const Context & ctx,SkIPoint * offset) const71 sk_sp<SkSpecialImage> onFilterImage(const Context& ctx, SkIPoint* offset) const override {
72 offset->set(0, 0);
73 return sk_ref_sp<SkSpecialImage>(ctx.sourceImage());
74 }
75
76 private:
IdentityImageFilter(sk_sp<SkImageFilter> input)77 IdentityImageFilter(sk_sp<SkImageFilter> input) : INHERITED(&input, 1, nullptr) {}
78
79 using INHERITED = SkImageFilter_Base;
80 };
81
82 // Register these image filters as deserializable before main().
83 namespace {
84 static struct Initializer {
Initializer__anon0f8e10c50111::Initializer85 Initializer() {
86 SK_REGISTER_FLATTENABLE(IdentityImageFilter);
87 SK_REGISTER_FLATTENABLE(FailImageFilter);
88 }
89 } initializer;
90 } // namespace
91
CreateProc(SkReadBuffer & buffer)92 sk_sp<SkFlattenable> IdentityImageFilter::CreateProc(SkReadBuffer& buffer) {
93 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
94 return IdentityImageFilter::Make(common.getInput(0));
95 }
96
97 ///////////////////////////////////////////////////////////////////////////////
98
draw_paint(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)99 static void draw_paint(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
100 SkPaint paint;
101 paint.setImageFilter(std::move(imf));
102 paint.setColor(SK_ColorGREEN);
103 canvas->save();
104 canvas->clipRect(r);
105 canvas->drawPaint(paint);
106 canvas->restore();
107 }
108
draw_line(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)109 static void draw_line(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
110 SkPaint paint;
111 paint.setColor(SK_ColorBLUE);
112 paint.setImageFilter(imf);
113 paint.setStrokeWidth(r.width()/10);
114 canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
115 }
116
draw_rect(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)117 static void draw_rect(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
118 SkPaint paint;
119 paint.setColor(SK_ColorYELLOW);
120 paint.setImageFilter(imf);
121 SkRect rr(r);
122 rr.inset(r.width()/10, r.height()/10);
123 canvas->drawRect(rr, paint);
124 }
125
draw_path(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)126 static void draw_path(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
127 SkPaint paint;
128 paint.setColor(SK_ColorMAGENTA);
129 paint.setImageFilter(imf);
130 paint.setAntiAlias(true);
131 canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
132 }
133
draw_text(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)134 static void draw_text(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
135 SkPaint paint;
136 paint.setImageFilter(imf);
137 paint.setColor(SK_ColorCYAN);
138 SkFont font(ToolUtils::create_portable_typeface(), r.height() / 2);
139 SkTextUtils::DrawString(canvas, "Text", r.centerX(), r.centerY(), font, paint,
140 SkTextUtils::kCenter_Align);
141 }
142
draw_bitmap(SkCanvas * canvas,SkImage * i,const SkRect & r,sk_sp<SkImageFilter> imf)143 static void draw_bitmap(SkCanvas* canvas, SkImage* i, const SkRect& r, sk_sp<SkImageFilter> imf) {
144 SkPaint paint;
145 paint.setImageFilter(std::move(imf));
146
147 SkIRect bounds;
148 r.roundOut(&bounds);
149
150 SkBitmap bm;
151 bm.allocN32Pixels(bounds.width(), bounds.height());
152 bm.eraseColor(SK_ColorTRANSPARENT);
153 SkCanvas c(bm);
154 draw_path(&c, i, r, nullptr);
155
156 canvas->drawImage(bm.asImage(), 0, 0, SkSamplingOptions(), &paint);
157 }
158
draw_patch(SkCanvas * canvas,SkImage *,const SkRect & r,sk_sp<SkImageFilter> imf)159 static void draw_patch(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
160 SkPaint paint;
161 paint.setImageFilter(std::move(imf));
162
163 // The order of the colors and points is clockwise starting at upper-left corner.
164 static constexpr SkPoint gCubics[SkPatchUtils::kNumCtrlPts] = {
165 //top points
166 {100,100},{150,50},{250,150},{300,100},
167 //right points
168 {250,150},{350,250},
169 //bottom points
170 {300,300},{250,250},{150,350},{100,300},
171 //left points
172 {50,250},{150,150}
173 };
174
175 static constexpr SkColor colors[SkPatchUtils::kNumCorners] = {
176 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
177 };
178
179 SkAutoCanvasRestore acr(canvas, /*doSave=*/true);
180 canvas->translate(-r.fLeft, -r.fTop);
181 canvas->scale(r.width() / 400.0, r.height() / 400.0);
182 canvas->drawPatch(gCubics, colors, /*texCoords=*/nullptr, SkBlendMode::kSrc, paint);
183 }
184
draw_atlas(SkCanvas * canvas,SkImage * atlas,const SkRect & r,sk_sp<SkImageFilter> imf)185 static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRect& r,
186 sk_sp<SkImageFilter> imf) {
187 const SkScalar rad = SkDegreesToRadians(15.0f);
188 SkRSXform xform = SkRSXform::Make(SkScalarCos(rad), SkScalarSin(rad), r.width() * 0.15f, 0);
189
190 SkPaint paint;
191 paint.setImageFilter(std::move(imf));
192 paint.setAntiAlias(true);
193 SkSamplingOptions sampling(SkCubicResampler::Mitchell());
194 canvas->drawAtlas(atlas, &xform, &r, /*colors=*/nullptr, /*count=*/1, SkBlendMode::kSrc,
195 sampling, /*cullRect=*/nullptr, &paint);
196 }
197
198 ///////////////////////////////////////////////////////////////////////////////
199
200 class ImageFiltersBaseGM : public skiagm::GM {
201 public:
ImageFiltersBaseGM()202 ImageFiltersBaseGM () {}
203
204 protected:
onShortName()205 SkString onShortName() override {
206 return SkString("imagefiltersbase");
207 }
208
onISize()209 SkISize onISize() override { return SkISize::Make(700, 500); }
210
draw_frame(SkCanvas * canvas,const SkRect & r)211 void draw_frame(SkCanvas* canvas, const SkRect& r) {
212 SkPaint paint;
213 paint.setStyle(SkPaint::kStroke_Style);
214 paint.setColor(SK_ColorRED);
215 canvas->drawRect(r, paint);
216 }
217
onDraw(SkCanvas * canvas)218 void onDraw(SkCanvas* canvas) override {
219 if (fAtlas == nullptr) {
220 fAtlas = create_atlas_image(canvas);
221 }
222
223 void (*drawProc[])(SkCanvas*, SkImage*, const SkRect&, sk_sp<SkImageFilter>) = {
224 draw_paint,
225 draw_line, draw_rect, draw_path, draw_text,
226 draw_bitmap, draw_patch, draw_atlas
227 };
228
229 auto cf = SkColorFilters::Blend(SK_ColorRED, SkBlendMode::kSrcIn);
230 sk_sp<SkImageFilter> filters[] = {
231 nullptr,
232 IdentityImageFilter::Make(nullptr),
233 FailImageFilter::Make(),
234 SkImageFilters::ColorFilter(std::move(cf), nullptr),
235 // The strange 0.29 value tickles an edge case where crop rect calculates
236 // a small border, but the blur really needs no border. This tickles
237 // an msan uninitialized value bug.
238 SkImageFilters::Blur(12.0f, 0.29f, nullptr),
239 SkImageFilters::DropShadow(10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr),
240 };
241
242 SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
243 SkScalar MARGIN = SkIntToScalar(16);
244 SkScalar DX = r.width() + MARGIN;
245 SkScalar DY = r.height() + MARGIN;
246
247 canvas->translate(MARGIN, MARGIN);
248 for (size_t i = 0; i < SK_ARRAY_COUNT(drawProc); ++i) {
249 canvas->save();
250 for (size_t j = 0; j < SK_ARRAY_COUNT(filters); ++j) {
251 drawProc[i](canvas, fAtlas.get(), r, filters[j]);
252
253 draw_frame(canvas, r);
254 canvas->translate(0, DY);
255 }
256 canvas->restore();
257 canvas->translate(DX, 0);
258 }
259 }
260
261 private:
create_atlas_image(SkCanvas * canvas)262 static sk_sp<SkImage> create_atlas_image(SkCanvas* canvas) {
263 static constexpr SkSize kSize = {64, 64};
264 SkImageInfo atlasInfo = SkImageInfo::MakeN32Premul(kSize.fWidth, kSize.fHeight);
265 sk_sp<SkSurface> atlasSurface(ToolUtils::makeSurface(canvas, atlasInfo));
266 SkCanvas* atlasCanvas = atlasSurface->getCanvas();
267
268 SkPaint atlasPaint;
269 atlasPaint.setColor(SK_ColorGRAY);
270 SkFont font(ToolUtils::create_portable_typeface(), kSize.fHeight * 0.4f);
271 SkTextUtils::DrawString(atlasCanvas, "Atlas", kSize.fWidth * 0.5f, kSize.fHeight * 0.5f,
272 font, atlasPaint, SkTextUtils::kCenter_Align);
273 return atlasSurface->makeImageSnapshot();
274 }
275
276 sk_sp<SkImage> fAtlas;
277
278 using INHERITED = GM;
279 };
280 DEF_GM( return new ImageFiltersBaseGM; )
281
282 ///////////////////////////////////////////////////////////////////////////////
283
284 /*
285 * Want to test combos of filter and LCD text, to be sure we disable LCD in the presence of
286 * a filter.
287 */
288 class ImageFiltersTextBaseGM : public skiagm::GM {
289 SkString fSuffix;
290 public:
ImageFiltersTextBaseGM(const char suffix[])291 ImageFiltersTextBaseGM(const char suffix[]) : fSuffix(suffix) {}
292
293 protected:
onShortName()294 SkString onShortName() override {
295 SkString name;
296 name.printf("%s_%s", "textfilter", fSuffix.c_str());
297 return name;
298 }
299
onISize()300 SkISize onISize() override { return SkISize::Make(512, 342); }
301
drawWaterfall(SkCanvas * canvas,const SkPaint & paint)302 void drawWaterfall(SkCanvas* canvas, const SkPaint& paint) {
303 static const SkFont::Edging kEdgings[3] = {
304 SkFont::Edging::kAlias,
305 SkFont::Edging::kAntiAlias,
306 SkFont::Edging::kSubpixelAntiAlias,
307 };
308 SkFont font(ToolUtils::create_portable_typeface(), 30);
309
310 SkAutoCanvasRestore acr(canvas, true);
311 for (SkFont::Edging edging : kEdgings) {
312 font.setEdging(edging);
313 canvas->drawString("Hamburgefon", 0, 0, font, paint);
314 canvas->translate(0, 40);
315 }
316 }
317
318 virtual void installFilter(SkPaint* paint) = 0;
319
onDraw(SkCanvas * canvas)320 void onDraw(SkCanvas* canvas) override {
321 canvas->translate(20, 40);
322
323 for (int doSaveLayer = 0; doSaveLayer <= 1; ++doSaveLayer) {
324 SkAutoCanvasRestore acr(canvas, true);
325 for (int useFilter = 0; useFilter <= 1; ++useFilter) {
326 SkAutoCanvasRestore acr2(canvas, true);
327
328 SkPaint paint;
329 if (useFilter) {
330 this->installFilter(&paint);
331 }
332 if (doSaveLayer) {
333 canvas->saveLayer(nullptr, &paint);
334 paint.setImageFilter(nullptr);
335 }
336 this->drawWaterfall(canvas, paint);
337
338 acr2.restore();
339 canvas->translate(250, 0);
340 }
341 acr.restore();
342 canvas->translate(0, 200);
343 }
344 }
345
346 private:
347 using INHERITED = GM;
348 };
349
350 class ImageFiltersText_IF : public ImageFiltersTextBaseGM {
351 public:
ImageFiltersText_IF()352 ImageFiltersText_IF() : ImageFiltersTextBaseGM("image") {}
353
installFilter(SkPaint * paint)354 void installFilter(SkPaint* paint) override {
355 paint->setImageFilter(SkImageFilters::Blur(1.5f, 1.5f, nullptr));
356 }
357 };
358 DEF_GM( return new ImageFiltersText_IF; )
359
360 class ImageFiltersText_CF : public ImageFiltersTextBaseGM {
361 public:
ImageFiltersText_CF()362 ImageFiltersText_CF() : ImageFiltersTextBaseGM("color") {}
363
installFilter(SkPaint * paint)364 void installFilter(SkPaint* paint) override {
365 paint->setColorFilter(SkColorFilters::Blend(SK_ColorBLUE, SkBlendMode::kSrcIn));
366 }
367 };
368 DEF_GM( return new ImageFiltersText_CF; )
369