/* * Copyright 2014 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "samplecode/Sample.h" #include "include/core/SkCanvas.h" #include "include/core/SkColorPriv.h" #include "include/core/SkFont.h" #include "include/core/SkStream.h" #include "include/effects/SkBlurMaskFilter.h" #include "include/utils/SkRandom.h" #include "samplecode/DecodeFile.h" #include "tools/Resources.h" // Intended to exercise pixel snapping observed with scaled images (and // with non-scaled images, but for a different reason): Bug 1145 class SubpixelTranslateView : public Sample { public: SubpixelTranslateView(const char imageFilename[], float horizontalVelocity, float verticalVelocity) : fHorizontalVelocity(horizontalVelocity) , fVerticalVelocity(verticalVelocity) { if (!DecodeDataToBitmap(GetResourceAsData(imageFilename), &fBM)) { fBM.allocN32Pixels(1, 1); *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad } fCurPos = SkPoint::Make(0,0); fSize = 200; } protected: SkBitmap fBM; SkScalar fSize; float fHorizontalVelocity, fVerticalVelocity; SkPoint fCurPos; SkString name() override { return SkString("SubpixelTranslate"); } void onDrawContent(SkCanvas* canvas) override { static const SkFilterQuality gQualitys[] = { kNone_SkFilterQuality, kLow_SkFilterQuality, kMedium_SkFilterQuality, kHigh_SkFilterQuality }; SkPaint paint; SkFont font(nullptr, 48); font.setSubpixel(true); paint.setAntiAlias(true); for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { paint.setFilterQuality(gQualitys[i]); SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize ); canvas->drawBitmapRect( fBM, r, &paint ); } canvas->drawString("AA Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), fCurPos.fY + fSize/2, font, paint); paint.setAntiAlias(false); font.setEdging(SkFont::Edging::kAlias); for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { paint.setFilterQuality(gQualitys[i]); SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize ); canvas->drawBitmapRect( fBM, r, &paint ); } canvas->drawString("Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), fCurPos.fY + fSize + 10 + fSize/2, font, paint); paint.setAntiAlias(true); font.setEdging(SkFont::Edging::kAntiAlias); for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { paint.setFilterQuality(gQualitys[i]); canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint ); } canvas->drawString("AA No Scale", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fSize/2, font, paint); paint.setAntiAlias(false); font.setEdging(SkFont::Edging::kAlias); for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) { paint.setFilterQuality(gQualitys[i]); canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint ); } canvas->drawString("No Scale", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, font, paint); fCurPos.fX += fHorizontalVelocity; fCurPos.fY += fVerticalVelocity; } private: typedef Sample INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_SAMPLE( return new SubpixelTranslateView("images/mandrill_256.png", .05f, .05f); )