From 1803f4eb341dd0209dde8cc7ee0fa4b409fb2704 Mon Sep 17 00:00:00 2001 From: "commit-bot@chromium.org" Date: Thu, 29 May 2014 22:01:08 +0000 Subject: [PATCH] new animated sample to show subpixel translate bug with high quality scaling 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 --- gyp/SampleApp.gyp | 1 + samplecode/SampleSubpixelTranslate.cpp | 126 +++++++++++++++++++++++++ 2 files changed, 127 insertions(+) create mode 100644 samplecode/SampleSubpixelTranslate.cpp diff --git a/gyp/SampleApp.gyp b/gyp/SampleApp.gyp index 3eb735f74b..90a51aba10 100644 --- a/gyp/SampleApp.gyp +++ b/gyp/SampleApp.gyp @@ -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', diff --git a/samplecode/SampleSubpixelTranslate.cpp b/samplecode/SampleSubpixelTranslate.cpp new file mode 100644 index 0000000000..dd1ba110a6 --- /dev/null +++ b/samplecode/SampleSubpixelTranslate.cpp @@ -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);