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new animated sample to show subpixel translate bug with high quality scaling

Browse Source 
BUG=1445
R=reed@google.com, robertphillips@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/303123003

git-svn-id: http://skia.googlecode.com/svn/trunk@14981 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2014-05-29 22:01:08 +00:00
parent 6eac42e3ab
commit 1803f4eb34
2 changed files with 127 additions and 0 deletions
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1
gyp/SampleApp.gyp
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@ -99,6 +99,7 @@
'../samplecode/SampleSlides.cpp',
'../samplecode/SampleStringArt.cpp',
'../samplecode/SampleStrokePath.cpp',
'../samplecode/SampleSubpixelTranslate.cpp',
'../samplecode/SampleText.cpp',
'../samplecode/SampleTextAlpha.cpp',
'../samplecode/SampleTextBox.cpp',

126
samplecode/SampleSubpixelTranslate.cpp Normal file
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@ -0,0 +1,126 @@
/*
* 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 "gm.h"
#include "SampleCode.h"
#include "SkBlurMaskFilter.h"
#include "SkColorPriv.h"
#include "SkCanvas.h"
#include "SkImageDecoder.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)
: fFilename(imageFilename),
fHorizontalVelocity(horizontalVelocity),
fVerticalVelocity(verticalVelocity) {
SkString path(skiagm::GM::GetResourcePath());
path.append("/");
path.append(fFilename);
SkImageDecoder *codec = NULL;
SkFILEStream stream(path.c_str());
if (stream.isValid()) {
codec = SkImageDecoder::Factory(&stream);
}
if (codec) {
stream.rewind();
codec->decode(&stream, &fBM, SkBitmap::kARGB_8888_Config,
SkImageDecoder::kDecodePixels_Mode);
SkDELETE(codec);
} else {
fBM.allocN32Pixels(1, 1);
*(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
}
fCurPos = SkPoint::Make(0,0);
fSize = 200;
}
protected:
SkBitmap fBM;
SkString fFilename;
int fSize;
float fHorizontalVelocity, fVerticalVelocity;
SkPoint fCurPos;
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "SubpixelTranslate");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
static const SkPaint::FilterLevel gLevels[] = {
SkPaint::kNone_FilterLevel,
SkPaint::kLow_FilterLevel,
SkPaint::kMedium_FilterLevel,
SkPaint::kHigh_FilterLevel
};
SkPaint paint;
paint.setTextSize(48);
paint.setAntiAlias(true);
for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
paint.setFilterLevel(gLevels[i]);
SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize );
canvas->drawBitmapRect( fBM, r, &paint );
}
canvas->drawText( "AA Scaled", strlen("AA Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize/2, paint );
paint.setAntiAlias(false);
for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
paint.setFilterLevel(gLevels[i]);
SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize );
canvas->drawBitmapRect( fBM, r, &paint );
}
canvas->drawText( "Scaled", strlen("Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize + 10 + fSize/2, paint );
paint.setAntiAlias(true);
for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
paint.setFilterLevel(gLevels[i]);
canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint );
}
canvas->drawText( "AA No Scale", strlen("AA No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fSize/2, paint );
paint.setAntiAlias(false);
for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
paint.setFilterLevel(gLevels[i]);
canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint );
}
canvas->drawText( "No Scale", strlen("No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, paint );
fCurPos.fX += fHorizontalVelocity;
fCurPos.fY += fVerticalVelocity;
this->inval(NULL);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05, .05); }
static SkViewRegister reg(MyFactory);