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