1 /*
2 * Copyright 2015 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/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkColorSpace.h"
13 #include "include/core/SkFont.h"
14 #include "include/core/SkFontTypes.h"
15 #include "include/core/SkImage.h"
16 #include "include/core/SkImageGenerator.h"
17 #include "include/core/SkImageInfo.h"
18 #include "include/core/SkMatrix.h"
19 #include "include/core/SkPaint.h"
20 #include "include/core/SkPath.h"
21 #include "include/core/SkPicture.h"
22 #include "include/core/SkPictureRecorder.h"
23 #include "include/core/SkPoint.h"
24 #include "include/core/SkRect.h"
25 #include "include/core/SkRefCnt.h"
26 #include "include/core/SkScalar.h"
27 #include "include/core/SkShader.h"
28 #include "include/core/SkSize.h"
29 #include "include/core/SkString.h"
30 #include "include/core/SkTileMode.h"
31 #include "include/core/SkTypeface.h"
32 #include "include/core/SkTypes.h"
33 #include "include/effects/SkGradientShader.h"
34 #include "include/utils/SkTextUtils.h"
35 #include "src/image/SkImageGeneratorPriv.h"
36 #include "tools/ToolUtils.h"
37 #include "tools/fonts/FontToolUtils.h"
38
39 #include <string.h>
40 #include <memory>
41
draw_vector_logo(SkCanvas * canvas,const SkRect & viewBox)42 static void draw_vector_logo(SkCanvas* canvas, const SkRect& viewBox) {
43 constexpr char kSkiaStr[] = "SKIA";
44 constexpr SkScalar kGradientPad = .1f;
45 constexpr SkScalar kVerticalSpacing = 0.25f;
46 constexpr SkScalar kAccentScale = 1.20f;
47
48 SkPaint paint;
49 paint.setAntiAlias(true);
50
51 SkFont font = ToolUtils::DefaultPortableFont();
52 font.setSubpixel(true);
53 font.setEmbolden(true);
54
55 SkPath path;
56 SkTextUtils::GetPath("SKI", 3, SkTextEncoding::kUTF8, 0, 0, font, &path);
57 auto skiBox = path.computeTightBounds();
58
59 SkTextUtils::GetPath("I", 1, SkTextEncoding::kUTF8, 0, 0, font, &path);
60 auto iBox = path.computeTightBounds();
61 iBox.offsetTo(skiBox.fRight - iBox.width(), iBox.fTop);
62
63 const size_t textLen = strlen(kSkiaStr);
64 SkTextUtils::GetPath(kSkiaStr, textLen, SkTextEncoding::kUTF8, 0, 0, font, &path);
65 auto skiaBox = path.computeTightBounds();
66 skiaBox.outset(0, 2 * iBox.width() * (kVerticalSpacing + 1));
67
68 const SkScalar accentSize = iBox.width() * kAccentScale;
69 const SkScalar underlineY = iBox.bottom() +
70 (kVerticalSpacing + SkScalarSqrt(3) / 2) * accentSize;
71 SkAutoCanvasRestore acr(canvas, true);
72 canvas->concat(SkMatrix::RectToRect(skiaBox, viewBox));
73
74 canvas->drawCircle(iBox.centerX(),
75 iBox.y() - (0.5f + kVerticalSpacing) * accentSize,
76 accentSize / 2,
77 paint);
78
79 path.reset();
80 path.moveTo(iBox.centerX() - accentSize / 2, iBox.bottom() + kVerticalSpacing * accentSize);
81 path.rLineTo(accentSize, 0);
82 path.lineTo(iBox.centerX(), underlineY);
83 canvas->drawPath(path, paint);
84
85 SkRect underlineRect = SkRect::MakeLTRB(iBox.centerX() - iBox.width() * accentSize * 3,
86 underlineY,
87 iBox.centerX(),
88 underlineY + accentSize / 10);
89 const SkPoint pts1[] = { SkPoint::Make(underlineRect.x(), 0),
90 SkPoint::Make(iBox.centerX(), 0) };
91 const SkScalar pos1[] = { 0, 0.75f };
92 const SkColor colors1[] = { SK_ColorTRANSPARENT, SK_ColorBLACK };
93 SkASSERT(std::size(pos1) == std::size(colors1));
94 paint.setShader(SkGradientShader::MakeLinear(pts1, colors1, pos1, std::size(pos1),
95 SkTileMode::kClamp));
96 canvas->drawRect(underlineRect, paint);
97
98 const SkPoint pts2[] = { SkPoint::Make(iBox.x() - iBox.width() * kGradientPad, 0),
99 SkPoint::Make(iBox.right() + iBox.width() * kGradientPad, 0) };
100 const SkScalar pos2[] = { 0, .01f, 1.0f/3, 1.0f/3, 2.0f/3, 2.0f/3, .99f, 1 };
101 const SkColor colors2[] = {
102 SK_ColorBLACK,
103 0xffca5139,
104 0xffca5139,
105 0xff8dbd53,
106 0xff8dbd53,
107 0xff5460a5,
108 0xff5460a5,
109 SK_ColorBLACK
110 };
111 SkASSERT(std::size(pos2) == std::size(colors2));
112 paint.setShader(SkGradientShader::MakeLinear(pts2, colors2, pos2, std::size(pos2),
113 SkTileMode::kClamp));
114 canvas->drawSimpleText(kSkiaStr, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
115 }
116
117 // This GM exercises SkPictureImageGenerator features
118 // (in particular its matrix vs. bounds semantics).
119 class PictureGeneratorGM : public skiagm::GM {
120 protected:
getName() const121 SkString getName() const override { return SkString("pictureimagegenerator"); }
122
getISize()123 SkISize getISize() override { return SkISize::Make(1160, 860); }
124
onOnceBeforeDraw()125 void onOnceBeforeDraw() override {
126 const SkRect rect = SkRect::MakeWH(kPictureWidth, kPictureHeight);
127 SkPictureRecorder recorder;
128 SkCanvas* canvas = recorder.beginRecording(rect);
129 draw_vector_logo(canvas, rect);
130 fPicture = recorder.finishRecordingAsPicture();
131 }
132
onDraw(SkCanvas * canvas)133 void onDraw(SkCanvas* canvas) override {
134 const struct {
135 SkISize size;
136 SkScalar scaleX, scaleY;
137 SkScalar opacity;
138 } configs[] = {
139 { SkISize::Make(200, 100), 1, 1, 1 },
140 { SkISize::Make(200, 200), 1, 1, 1 },
141 { SkISize::Make(200, 200), 1, 2, 1 },
142 { SkISize::Make(400, 200), 2, 2, 1 },
143
144 { SkISize::Make(200, 100), 1, 1, 0.9f },
145 { SkISize::Make(200, 200), 1, 1, 0.75f },
146 { SkISize::Make(200, 200), 1, 2, 0.5f },
147 { SkISize::Make(400, 200), 2, 2, 0.25f },
148
149 { SkISize::Make(200, 200), 0.5f, 1, 1 },
150 { SkISize::Make(200, 200), 1, 0.5f, 1 },
151 { SkISize::Make(200, 200), 0.5f, 0.5f, 1 },
152 { SkISize::Make(200, 200), 2, 2, 1 },
153
154 { SkISize::Make(200, 100), -1, 1, 1 },
155 { SkISize::Make(200, 100), 1, -1, 1 },
156 { SkISize::Make(200, 100), -1, -1, 1 },
157 { SkISize::Make(200, 100), -1, -1, 0.5f },
158 };
159
160 auto srgbColorSpace = SkColorSpace::MakeSRGB();
161 const unsigned kDrawsPerRow = 4;
162 const SkScalar kDrawSize = 250;
163
164 for (size_t i = 0; i < std::size(configs); ++i) {
165 SkPaint p;
166 p.setAlphaf(configs[i].opacity);
167
168 SkMatrix m = SkMatrix::Scale(configs[i].scaleX, configs[i].scaleY);
169 if (configs[i].scaleX < 0) {
170 m.postTranslate(SkIntToScalar(configs[i].size.width()), 0);
171 }
172 if (configs[i].scaleY < 0) {
173 m.postTranslate(0, SkIntToScalar(configs[i].size.height()));
174 }
175 std::unique_ptr<SkImageGenerator> gen =
176 SkImageGenerators::MakeFromPicture(configs[i].size,
177 fPicture,
178 &m,
179 p.getAlpha() != 255 ? &p : nullptr,
180 SkImages::BitDepth::kU8,
181 srgbColorSpace);
182
183 SkImageInfo bmInfo = gen->getInfo().makeColorSpace(canvas->imageInfo().refColorSpace());
184
185 SkBitmap bm;
186 bm.allocPixels(bmInfo);
187 SkAssertResult(gen->getPixels(bm.info(), bm.getPixels(), bm.rowBytes()));
188
189 const SkScalar x = kDrawSize * (i % kDrawsPerRow);
190 const SkScalar y = kDrawSize * (i / kDrawsPerRow);
191
192 p.setColor(0xfff0f0f0);
193 p.setAlphaf(1.0f);
194 canvas->drawRect(SkRect::MakeXYWH(x, y,
195 SkIntToScalar(bm.width()),
196 SkIntToScalar(bm.height())), p);
197 canvas->drawImage(bm.asImage(), x, y);
198 }
199 }
200
201 private:
202 sk_sp<SkPicture> fPicture;
203
204 const SkScalar kPictureWidth = 200;
205 const SkScalar kPictureHeight = 100;
206
207 using INHERITED = skiagm::GM;
208 };
209
210 DEF_GM(return new PictureGeneratorGM;)
211