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