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 "Sample.h" 9 10 #include "DecodeFile.h" 11 #include "Resources.h" 12 #include "SkBlurMaskFilter.h" 13 #include "SkCanvas.h" 14 #include "SkColorPriv.h" 15 #include "SkFont.h" 16 #include "SkRandom.h" 17 #include "SkStream.h" 18 19 // Intended to exercise pixel snapping observed with scaled images (and 20 // with non-scaled images, but for a different reason): Bug 1145 21 22 class SubpixelTranslateView : public Sample { 23 public: SubpixelTranslateView(const char imageFilename[],float horizontalVelocity,float verticalVelocity)24 SubpixelTranslateView(const char imageFilename[], 25 float horizontalVelocity, 26 float verticalVelocity) 27 : fHorizontalVelocity(horizontalVelocity) 28 , fVerticalVelocity(verticalVelocity) 29 { 30 if (!DecodeDataToBitmap(GetResourceAsData(imageFilename), &fBM)) { 31 fBM.allocN32Pixels(1, 1); 32 *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad 33 } 34 fCurPos = SkPoint::Make(0,0); 35 fSize = 200; 36 } 37 38 protected: 39 SkBitmap fBM; 40 SkScalar fSize; 41 float fHorizontalVelocity, fVerticalVelocity; 42 43 SkPoint fCurPos; 44 onQuery(Sample::Event * evt)45 bool onQuery(Sample::Event* evt) override { 46 if (Sample::TitleQ(*evt)) { 47 Sample::TitleR(evt, "SubpixelTranslate"); 48 return true; 49 } 50 return this->INHERITED::onQuery(evt); 51 } 52 onDrawContent(SkCanvas * canvas)53 void onDrawContent(SkCanvas* canvas) override { 54 55 static const SkFilterQuality gQualitys[] = { 56 kNone_SkFilterQuality, 57 kLow_SkFilterQuality, 58 kMedium_SkFilterQuality, 59 kHigh_SkFilterQuality 60 }; 61 62 SkPaint paint; 63 SkFont font(nullptr, 48); 64 font.setSubpixel(true); 65 66 paint.setAntiAlias(true); 67 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { 68 paint.setFilterQuality(gQualitys[i]); 69 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize ); 70 canvas->drawBitmapRect( fBM, r, &paint ); 71 } 72 73 canvas->drawString("AA Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), 74 fCurPos.fY + fSize/2, font, paint); 75 76 paint.setAntiAlias(false); 77 font.setEdging(SkFont::Edging::kAlias); 78 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { 79 paint.setFilterQuality(gQualitys[i]); 80 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize ); 81 canvas->drawBitmapRect( fBM, r, &paint ); 82 } 83 canvas->drawString("Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), 84 fCurPos.fY + fSize + 10 + fSize/2, font, paint); 85 86 paint.setAntiAlias(true); 87 font.setEdging(SkFont::Edging::kAntiAlias); 88 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { 89 paint.setFilterQuality(gQualitys[i]); 90 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint ); 91 } 92 93 canvas->drawString("AA No Scale", 94 fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), 95 fCurPos.fY + 2*(fSize + 10) + fSize/2, font, paint); 96 97 paint.setAntiAlias(false); 98 font.setEdging(SkFont::Edging::kAlias); 99 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { 100 paint.setFilterQuality(gQualitys[i]); 101 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint ); 102 } 103 104 canvas->drawString("No Scale", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), 105 fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, font, paint); 106 107 108 fCurPos.fX += fHorizontalVelocity; 109 fCurPos.fY += fVerticalVelocity; 110 } 111 112 private: 113 typedef Sample INHERITED; 114 }; 115 116 ////////////////////////////////////////////////////////////////////////////// 117 118 DEF_SAMPLE( return new SubpixelTranslateView("images/mandrill_256.png", .05f, .05f); ) 119
