1 /* 2 * Copyright 2011 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/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkFont.h" 12 #include "include/core/SkMatrix.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkPoint.h" 15 #include "include/core/SkRefCnt.h" 16 #include "include/core/SkScalar.h" 17 #include "include/core/SkSize.h" 18 #include "include/core/SkString.h" 19 #include "include/core/SkTypeface.h" 20 #include "include/core/SkTypes.h" 21 #include "tools/fonts/FontToolUtils.h" 22 23 class LcdTextGM : public skiagm::GM { 24 static constexpr SkScalar kTextHeight = 36; 25 SkScalar fY = kTextHeight; 26 getName() const27 SkString getName() const override { return SkString("lcdtext"); } 28 getISize()29 SkISize getISize() override { return {640, 480}; } 30 onDraw(SkCanvas * canvas)31 void onDraw(SkCanvas* canvas) override { 32 fY = kTextHeight; 33 drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderTrue"), 34 true, true); 35 drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderFalse"), 36 true, false); 37 drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderTrue"), 38 false, true); 39 drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderFalse"), 40 false, false); 41 } 42 drawText(SkCanvas * canvas,const SkString & string,bool subpixelTextEnabled,bool lcdRenderTextEnabled)43 void drawText(SkCanvas* canvas, const SkString& string, 44 bool subpixelTextEnabled, bool lcdRenderTextEnabled) { 45 SkPaint paint; 46 paint.setColor(SK_ColorBLACK); 47 paint.setDither(true); 48 SkFont font(ToolUtils::DefaultPortableTypeface(), kTextHeight); 49 if (subpixelTextEnabled) { 50 font.setSubpixel(true); 51 } 52 if (lcdRenderTextEnabled) { 53 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 54 } 55 canvas->drawString(string, 0, fY, font, paint); 56 fY += kTextHeight; 57 } 58 }; 59 60 /* 61 * Skia will automatically disable LCD requests if the total size exceeds some limit 62 * (hard coded in this test for now, as it is now available as an API) 63 * 64 * Test this both by changing "textsize" and by changing the computed size (textsize * CTM) 65 */ 66 class LcdTextSizeGM : public skiagm::GM { ScaleAbout(SkCanvas * canvas,SkScalar sx,SkScalar sy,SkScalar px,SkScalar py)67 static void ScaleAbout(SkCanvas* canvas, SkScalar sx, SkScalar sy, SkScalar px, SkScalar py) { 68 SkMatrix m; 69 m.setScale(sx, sy, px, py); 70 canvas->concat(m); 71 } 72 getName() const73 SkString getName() const override { return SkString("lcdtextsize"); } 74 getISize()75 SkISize getISize() override { return {320, 120}; } 76 onDraw(SkCanvas * canvas)77 void onDraw(SkCanvas* canvas) override { 78 const char* lcd_text = "LCD"; 79 const char* gray_text = "GRAY"; 80 81 constexpr static float kLCDTextSizeLimit = 48; 82 83 const struct { 84 SkPoint fLoc; 85 SkScalar fTextSize; 86 SkScalar fScale; 87 const char* fText; 88 } rec[] = { 89 { { 10, 50 }, kLCDTextSizeLimit - 1, 1, lcd_text }, 90 { { 160, 50 }, kLCDTextSizeLimit + 1, 1, gray_text }, 91 { { 10, 100 }, kLCDTextSizeLimit / 2, 1.99f, lcd_text }, 92 { { 160, 100 }, kLCDTextSizeLimit / 2, 2.01f, gray_text }, 93 }; 94 95 for (size_t i = 0; i < std::size(rec); ++i) { 96 const SkPoint loc = rec[i].fLoc; 97 SkAutoCanvasRestore acr(canvas, true); 98 99 SkFont font(ToolUtils::DefaultPortableTypeface(), rec[i].fTextSize); 100 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 101 102 ScaleAbout(canvas, rec[i].fScale, rec[i].fScale, loc.x(), loc.y()); 103 canvas->drawString(rec[i].fText, loc.x(), loc.y(), font, SkPaint()); 104 } 105 } 106 }; 107 108 class SaveLayerPreserveLCDTextGM : public skiagm::GM { 109 static constexpr SkScalar kTextHeight = 36; 110 getName() const111 SkString getName() const override { return SkString("savelayerpreservelcdtext"); } 112 getISize()113 SkISize getISize() override { return {620, 300}; } 114 onDraw(SkCanvas * canvas)115 void onDraw(SkCanvas* canvas) override { 116 drawText(canvas, SkString("SaveLayer PreserveLCDText"), 50, 117 SkCanvas::kPreserveLCDText_SaveLayerFlag); 118 drawText(canvas, SkString("SaveLayer Default (LCDText not preserved)"), 150, 0); 119 } 120 drawText(SkCanvas * canvas,const SkString & string,int y,SkCanvas::SaveLayerFlags saveLayerFlags)121 void drawText(SkCanvas* canvas, 122 const SkString& string, 123 int y, 124 SkCanvas::SaveLayerFlags saveLayerFlags) { 125 SkCanvas::SaveLayerRec rec(nullptr, nullptr, saveLayerFlags); 126 canvas->saveLayer(rec); 127 SkPaint paint; 128 paint.setColor(SK_ColorWHITE); 129 canvas->drawRect(SkRect::MakeXYWH(0, y - 10, 640, kTextHeight + 20), paint); 130 paint.setColor(SK_ColorBLACK); 131 SkFont font(ToolUtils::DefaultPortableTypeface(), kTextHeight); 132 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 133 canvas->drawString(string, 10, y, font, paint); 134 canvas->restore(); 135 } 136 }; 137 138 DEF_GM(return new LcdTextGM;) 139 DEF_GM(return new LcdTextSizeGM;) 140 DEF_GM(return new SaveLayerPreserveLCDTextGM;) 141