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/SkBlurTypes.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/SkImageInfo.h"
16#include "include/core/SkMaskFilter.h"
17#include "include/core/SkPaint.h"
18#include "include/core/SkRect.h"
19#include "include/core/SkRefCnt.h"
20#include "include/core/SkScalar.h"
21#include "include/core/SkSize.h"
22#include "include/core/SkString.h"
23#include "include/core/SkSurface.h"
24#include "include/core/SkSurfaceProps.h"
25#include "include/core/SkTextBlob.h"
26#include "include/core/SkTypeface.h"
27#include "include/core/SkTypes.h"
28#include "include/utils/SkRandom.h"
29#include "src/core/SkBlurMask.h"
30#include "tools/Resources.h"
31#include "tools/ToolUtils.h"
32
33#include <string.h>
34
35namespace skiagm {
36class TextBlobMixedSizes : public GM {
37public:
38    // This gm tests that textblobs of mixed sizes with a large glyph will render properly
39    TextBlobMixedSizes(bool useDFT) : fUseDFT(useDFT) {}
40
41protected:
42    void onOnceBeforeDraw() override {
43        SkTextBlobBuilder builder;
44
45        // make textblob.  To stress distance fields, we choose sizes appropriately
46        SkFont font(MakeResourceAsTypeface("fonts/HangingS.ttf"), 262);
47        font.setSubpixel(true);
48        font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
49
50        const char* text = "Skia";
51
52        ToolUtils::add_to_text_blob(&builder, text, font, 0, 0);
53
54        // large
55        SkRect bounds;
56        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
57        SkScalar yOffset = bounds.height();
58        font.setSize(162);
59
60        ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset);
61
62        // Medium
63        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
64        yOffset += bounds.height();
65        font.setSize(72);
66
67        ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset);
68
69        // Small
70        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
71        yOffset += bounds.height();
72        font.setSize(32);
73
74        ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset);
75
76        // micro (will fall out of distance field text even if distance field text is enabled)
77        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
78        yOffset += bounds.height();
79        font.setSize(14);
80
81        ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset);
82
83        // Zero size.
84        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
85        yOffset += bounds.height();
86        font.setSize(0);
87
88        ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset);
89
90        // build
91        fBlob = builder.make();
92    }
93
94    SkString onShortName() override {
95        return SkStringPrintf("textblobmixedsizes%s",
96                              fUseDFT ? "_df" : "");
97    }
98
99    SkISize onISize() override {
100        return SkISize::Make(kWidth, kHeight);
101    }
102
103    void onDraw(SkCanvas* inputCanvas) override {
104        SkCanvas* canvas = inputCanvas;
105        sk_sp<SkSurface> surface;
106        if (fUseDFT) {
107            // Create a new Canvas to enable DFT
108            auto ctx = inputCanvas->recordingContext();
109            SkISize size = onISize();
110            sk_sp<SkColorSpace> colorSpace = inputCanvas->imageInfo().refColorSpace();
111            SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(),
112                                                    kPremul_SkAlphaType, colorSpace);
113            SkSurfaceProps inputProps;
114            inputCanvas->getProps(&inputProps);
115            SkSurfaceProps props(
116                    SkSurfaceProps::kUseDeviceIndependentFonts_Flag | inputProps.flags(),
117                    inputProps.pixelGeometry());
118            surface = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props);
119            canvas = surface ? surface->getCanvas() : inputCanvas;
120            // init our new canvas with the old canvas's matrix
121            canvas->setMatrix(inputCanvas->getTotalMatrix());
122        }
123        canvas->drawColor(SK_ColorWHITE);
124
125        SkRect bounds = fBlob->bounds();
126
127        const int kPadX = SkScalarFloorToInt(bounds.width() / 3);
128        const int kPadY = SkScalarFloorToInt(bounds.height() / 3);
129
130        int rowCount = 0;
131        canvas->translate(SkIntToScalar(kPadX), SkIntToScalar(kPadY));
132        canvas->save();
133        SkRandom random;
134
135        SkPaint paint;
136        if (!fUseDFT) {
137            paint.setColor(SK_ColorWHITE);
138        }
139        paint.setAntiAlias(false);
140
141        const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(8));
142
143        // setup blur paint
144        SkPaint blurPaint(paint);
145        blurPaint.setColor(SK_ColorBLACK);
146        blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, kSigma));
147
148        for (int i = 0; i < 4; i++) {
149            canvas->save();
150            switch (i % 2) {
151                case 0:
152                    canvas->rotate(random.nextF() * 45.f);
153                    break;
154                case 1:
155                    canvas->rotate(-random.nextF() * 45.f);
156                    break;
157            }
158            if (!fUseDFT) {
159                canvas->drawTextBlob(fBlob, 0, 0, blurPaint);
160            }
161            canvas->drawTextBlob(fBlob, 0, 0, paint);
162            canvas->restore();
163            canvas->translate(bounds.width() + SK_Scalar1 * kPadX, 0);
164            ++rowCount;
165            if ((bounds.width() + 2 * kPadX) * rowCount > kWidth) {
166                canvas->restore();
167                canvas->translate(0, bounds.height() + SK_Scalar1 * kPadY);
168                canvas->save();
169                rowCount = 0;
170            }
171        }
172        canvas->restore();
173
174        // render offscreen buffer
175        if (surface) {
176            SkAutoCanvasRestore acr(inputCanvas, true);
177            // since we prepended this matrix already, we blit using identity
178            inputCanvas->resetMatrix();
179            inputCanvas->drawImage(surface->makeImageSnapshot().get(), 0, 0);
180        }
181    }
182
183private:
184    sk_sp<SkTextBlob> fBlob;
185
186    static constexpr int kWidth = 2100;
187    static constexpr int kHeight = 1900;
188
189    bool fUseDFT;
190
191    using INHERITED = GM;
192};
193
194//////////////////////////////////////////////////////////////////////////////
195
196DEF_GM( return new TextBlobMixedSizes(false); )
197DEF_GM( return new TextBlobMixedSizes(true); )
198}  // namespace skiagm
199