1 /*
2 * Copyright 2013 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 // GM to stress the GPU font cache
9 // It's not necessary to run this with CPU configs
10
11 #include "gm.h"
12
13 #if SK_SUPPORT_GPU
14
15 #include "GrContext.h"
16 #include "GrContextOptions.h"
17 #include "SkCanvas.h"
18 #include "SkGraphics.h"
19 #include "SkImage.h"
20 #include "SkTypeface.h"
21 #include "gm.h"
22 #include "sk_tool_utils.h"
23
draw_string(SkCanvas * canvas,const SkString & text,SkScalar x,SkScalar y,const SkPaint & paint)24 static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
25 SkScalar y, const SkPaint& paint) {
26 canvas->drawString(text, x, y, paint);
27 return x + paint.measureText(text.c_str(), text.size());
28 }
29
30 class FontCacheGM : public skiagm::GM {
31 public:
FontCacheGM(GrContextOptions::Enable allowMultipleTextures)32 FontCacheGM(GrContextOptions::Enable allowMultipleTextures)
33 : fAllowMultipleTextures(allowMultipleTextures) {
34 this->setBGColor(SK_ColorLTGRAY);
35 }
36
modifyGrContextOptions(GrContextOptions * options)37 void modifyGrContextOptions(GrContextOptions* options) override {
38 options->fGlyphCacheTextureMaximumBytes = 0;
39 options->fAllowMultipleGlyphCacheTextures = fAllowMultipleTextures;
40 }
41
42 protected:
onShortName()43 SkString onShortName() override {
44 SkString name("fontcache");
45 if (GrContextOptions::Enable::kYes == fAllowMultipleTextures) {
46 name.append("-mt");
47 }
48 return name;
49 }
50
onISize()51 SkISize onISize() override { return SkISize::Make(kSize, kSize); }
52
onOnceBeforeDraw()53 void onOnceBeforeDraw() override {
54 fTypefaces[0] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Italic());
55 fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",SkFontStyle::Italic());
56 fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Normal());
57 fTypefaces[3] =
58 sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Normal());
59 fTypefaces[4] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Bold());
60 fTypefaces[5] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Bold());
61 }
62
onDraw(SkCanvas * canvas)63 void onDraw(SkCanvas* canvas) override {
64 GrRenderTargetContext* renderTargetContext =
65 canvas->internal_private_accessTopLayerRenderTargetContext();
66 if (!renderTargetContext) {
67 skiagm::GM::DrawGpuOnlyMessage(canvas);
68 return;
69 }
70
71 canvas->clear(SK_ColorLTGRAY);
72 this->drawText(canvas);
73 // Debugging tool for GPU.
74 static const bool kShowAtlas = false;
75 if (kShowAtlas) {
76 if (auto ctx = canvas->getGrContext()) {
77 auto img = ctx->getFontAtlasImage_ForTesting(kA8_GrMaskFormat);
78 canvas->drawImage(img, 0, 0);
79 }
80 }
81 }
82
83 private:
drawText(SkCanvas * canvas)84 void drawText(SkCanvas* canvas) {
85 static const int kSizes[] = {8, 9, 10, 11, 12, 13, 18, 20, 25};
86
87 static const SkString kTexts[] = {SkString("ABCDEFGHIJKLMNOPQRSTUVWXYZ"),
88 SkString("abcdefghijklmnopqrstuvwxyz"),
89 SkString("0123456789"),
90 SkString("!@#$%^&*()<>[]{}")};
91 SkPaint paint;
92 paint.setAntiAlias(true);
93 paint.setLCDRenderText(false);
94 paint.setSubpixelText(true);
95
96 static const SkScalar kSubPixelInc = 1 / 2.f;
97 SkScalar x = 0;
98 SkScalar y = 10;
99 SkScalar subpixelX = 0;
100 SkScalar subpixelY = 0;
101 bool offsetX = true;
102
103 if (GrContextOptions::Enable::kYes == fAllowMultipleTextures) {
104 canvas->scale(10, 10);
105 }
106
107 do {
108 for (auto s : kSizes) {
109 auto size = 2 * s;
110 paint.setTextSize(size);
111 for (const auto& typeface : fTypefaces) {
112 paint.setTypeface(typeface);
113 for (const auto& text : kTexts) {
114 x = size + draw_string(canvas, text, x + subpixelX, y + subpixelY, paint);
115 x = SkScalarCeilToScalar(x);
116 if (x + 100 > kSize) {
117 x = 0;
118 y += SkScalarCeilToScalar(size + 3);
119 if (y > kSize) {
120 return;
121 }
122 }
123 }
124 }
125 (offsetX ? subpixelX : subpixelY) += kSubPixelInc;
126 offsetX = !offsetX;
127 }
128 } while (true);
129 }
130
131 static constexpr SkScalar kSize = 1280;
132
133 GrContextOptions::Enable fAllowMultipleTextures;
134 sk_sp<SkTypeface> fTypefaces[6];
135 typedef GM INHERITED;
136 };
137
138 constexpr SkScalar FontCacheGM::kSize;
139
140 //////////////////////////////////////////////////////////////////////////////
141
142 DEF_GM(return new FontCacheGM(GrContextOptions::Enable::kNo))
143 DEF_GM(return new FontCacheGM(GrContextOptions::Enable::kYes))
144
145 #endif
146