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1 /*
2  * Copyright 2014 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 "SkCanvas.h"
11 #include "SkPath.h"
12 #include "SkTypeface.h"
13 #include "SkRandom.h"
14 
15 /**
16  * Draws text with random parameters. The text draws each get their own clip rect. It is also
17  * used as a bench to measure how well the GPU backend combines draw ops for text draws.
18  */
19 
20 class VariedTextGM : public skiagm::GM {
21 public:
VariedTextGM(bool effectiveClip,bool lcd)22     VariedTextGM(bool effectiveClip, bool lcd)
23         : fEffectiveClip(effectiveClip)
24         , fLCD(lcd) {
25     }
26 
27 protected:
onShortName()28     SkString onShortName() override {
29         SkString name("varied_text");
30         if (fEffectiveClip) {
31             name.append("_clipped");
32         } else {
33             name.append("_ignorable_clip");
34         }
35         if (fLCD) {
36             name.append("_lcd");
37         } else {
38             name.append("_no_lcd");
39         }
40         return name;
41     }
42 
onISize()43     SkISize onISize() override {
44         return SkISize::Make(640, 480);
45     }
46 
onOnceBeforeDraw()47     void onOnceBeforeDraw() override {
48         fPaint.setAntiAlias(true);
49         fPaint.setLCDRenderText(fLCD);
50 
51         SkISize size = this->getISize();
52         SkScalar w = SkIntToScalar(size.fWidth);
53         SkScalar h = SkIntToScalar(size.fHeight);
54 
55         static_assert(4 == SK_ARRAY_COUNT(fTypefaces), "typeface_cnt");
56         fTypefaces[0] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle());
57         fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",
58                             SkFontStyle::FromOldStyle(SkTypeface::kBold));
59         fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle());
60         fTypefaces[3] = sk_tool_utils::create_portable_typeface("serif",
61                             SkFontStyle::FromOldStyle(SkTypeface::kBold));
62 
63         SkRandom random;
64         for (int i = 0; i < kCnt; ++i) {
65             int length = random.nextRangeU(kMinLength, kMaxLength);
66             char text[kMaxLength];
67             for (int j = 0; j < length; ++j) {
68                 text[j] = (char)random.nextRangeU('!', 'z');
69             }
70             fStrings[i].set(text, length);
71 
72             fColors[i] = random.nextU();
73             fColors[i] |= 0xFF000000;
74             fColors[i] = sk_tool_utils::color_to_565(fColors[i]);
75 
76             constexpr SkScalar kMinPtSize = 8.f;
77             constexpr SkScalar kMaxPtSize = 32.f;
78 
79             fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);
80 
81             fTypefaceIndices[i] = random.nextULessThan(SK_ARRAY_COUNT(fTypefaces));
82 
83             SkRect r;
84             fPaint.setColor(fColors[i]);
85             fPaint.setTypeface(fTypefaces[fTypefaceIndices[i]]);
86             fPaint.setTextSize(fPtSizes[i]);
87 
88             fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
89             // safeRect is set of x,y positions where we can draw the string without hitting
90             // the GM's border.
91             SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
92             if (safeRect.isEmpty()) {
93                 // If we don't fit then just don't worry about how we get cliped to the device
94                 // border.
95                 safeRect = SkRect::MakeWH(w, h);
96             }
97             fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
98             fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);
99 
100             fClipRects[i] = r;
101             fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
102             fClipRects[i].outset(2.f, 2.f);
103 
104             if (fEffectiveClip) {
105                 fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
106             }
107         }
108     }
109 
onDraw(SkCanvas * canvas)110     void onDraw(SkCanvas* canvas) override {
111         for (int i = 0; i < kCnt; ++i) {
112             fPaint.setColor(fColors[i]);
113             fPaint.setTextSize(fPtSizes[i]);
114             fPaint.setTypeface(fTypefaces[fTypefaceIndices[i]]);
115 
116             canvas->save();
117                 canvas->clipRect(fClipRects[i]);
118                 canvas->translate(fPositions[i].fX, fPositions[i].fY);
119                 canvas->drawString(fStrings[i], 0, 0, fPaint);
120             canvas->restore();
121         }
122 
123         // Visualize the clips, but not in bench mode.
124         if (kBench_Mode != this->getMode()) {
125             SkPaint wirePaint;
126             wirePaint.setAntiAlias(true);
127             wirePaint.setStrokeWidth(0);
128             wirePaint.setStyle(SkPaint::kStroke_Style);
129             for (int i = 0; i < kCnt; ++i) {
130                 canvas->drawRect(fClipRects[i], wirePaint);
131             }
132         }
133     }
134 
runAsBench() const135     bool runAsBench() const override { return true; }
136 
137 private:
138     static constexpr int kCnt = 30;
139     static constexpr int kMinLength = 15;
140     static constexpr int kMaxLength = 40;
141 
142     bool        fEffectiveClip;
143     bool        fLCD;
144     sk_sp<SkTypeface> fTypefaces[4];
145     SkPaint     fPaint;
146 
147     // precomputed for each text draw
148     SkString        fStrings[kCnt];
149     SkColor         fColors[kCnt];
150     SkScalar        fPtSizes[kCnt];
151     int             fTypefaceIndices[kCnt];
152     SkPoint         fPositions[kCnt];
153     SkRect          fClipRects[kCnt];
154 
155     typedef skiagm::GM INHERITED;
156 };
157 
158 DEF_GM(return new VariedTextGM(false, false);)
159 DEF_GM(return new VariedTextGM(true, false);)
160 DEF_GM(return new VariedTextGM(false, true);)
161 DEF_GM(return new VariedTextGM(true, true);)
162