bcbc1788b4
This idea emerged while doing https://codereview.chromium.org/321723002/
(commit 880914c35c).
BUG=None
TEST=make tests && out/Debug/tests
R=mtklein@google.com
Author: tfarina@chromium.org
Review URL: https://codereview.chromium.org/346453002
127 lines
4.4 KiB
C++
127 lines
4.4 KiB
C++
/*
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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 "gm.h"
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#include "Resources.h"
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#include "SampleCode.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 "SkImageDecoder.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 SampleView {
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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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: fFilename(imageFilename),
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fHorizontalVelocity(horizontalVelocity),
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fVerticalVelocity(verticalVelocity) {
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SkString resourcePath = GetResourcePath();
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resourcePath.append("/");
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resourcePath.append(fFilename);
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SkImageDecoder* codec = NULL;
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SkFILEStream stream(resourcePath.c_str());
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if (stream.isValid()) {
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codec = SkImageDecoder::Factory(&stream);
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}
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if (codec) {
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stream.rewind();
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codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
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SkDELETE(codec);
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} else {
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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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SkString fFilename;
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SkScalar fSize;
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float fHorizontalVelocity, fVerticalVelocity;
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SkPoint fCurPos;
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::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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virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
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static const SkPaint::FilterLevel gLevels[] = {
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SkPaint::kNone_FilterLevel,
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SkPaint::kLow_FilterLevel,
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SkPaint::kMedium_FilterLevel,
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SkPaint::kHigh_FilterLevel
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};
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SkPaint paint;
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paint.setTextSize(48);
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paint.setAntiAlias(true);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
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paint.setFilterLevel(gLevels[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->drawText( "AA Scaled", strlen("AA Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize/2, paint );
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paint.setAntiAlias(false);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
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paint.setFilterLevel(gLevels[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->drawText( "Scaled", strlen("Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize + 10 + fSize/2, paint );
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paint.setAntiAlias(true);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
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paint.setFilterLevel(gLevels[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->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 );
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paint.setAntiAlias(false);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
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paint.setFilterLevel(gLevels[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->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 );
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fCurPos.fX += fHorizontalVelocity;
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fCurPos.fY += fVerticalVelocity;
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this->inval(NULL);
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}
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private:
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05f, .05f); }
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static SkViewRegister reg(MyFactory);
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