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/*
* 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 "DecodeFile.h"
#include "gm.h"
#include "Resources.h"
#include "SampleCode.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkRandom.h"
#include "SkStream.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 SampleView {
public:
SubpixelTranslateView(const char imageFilename[],
float horizontalVelocity,
float verticalVelocity)
: fHorizontalVelocity(horizontalVelocity),
fVerticalVelocity(verticalVelocity) {
SkString resourcePath = GetResourcePath(imageFilename);
if (!decode_file(resourcePath.c_str(), &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;
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "SubpixelTranslate");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
static const SkFilterQuality gQualitys[] = {
kNone_SkFilterQuality,
kLow_SkFilterQuality,
kMedium_SkFilterQuality,
kHigh_SkFilterQuality
};
SkPaint paint;
paint.setTextSize(48);
paint.setSubpixelText(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, paint );
paint.setAntiAlias(false);
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, paint );
paint.setAntiAlias(true);
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, paint );
paint.setAntiAlias(false);
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, paint );
fCurPos.fX += fHorizontalVelocity;
fCurPos.fY += fVerticalVelocity;
this->inval(nullptr);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05f, .05f); }
static SkViewRegister reg(MyFactory);
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