| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkData.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTime.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/utils/SkInterpolator.h" |
| #include "include/utils/SkRandom.h" |
| #include "samplecode/Sample.h" |
| #include "tools/Resources.h" |
| #include "tools/timer/TimeUtils.h" |
| |
| static sk_sp<SkSurface> make_surface(SkCanvas* canvas, const SkImageInfo& info) { |
| auto surface = canvas->makeSurface(info); |
| if (!surface) { |
| surface = SkSurface::MakeRaster(info); |
| } |
| return surface; |
| } |
| |
| static sk_sp<SkShader> make_shader(const SkRect& bounds) { |
| sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_128.png")); |
| return image ? image->makeShader() : nullptr; |
| } |
| |
| #define N 128 |
| #define ANGLE_DELTA 3 |
| #define SCALE_DELTA (SK_Scalar1 / 32) |
| |
| static sk_sp<SkImage> make_image() { |
| SkImageInfo info = SkImageInfo::MakeN32(N, N, kOpaque_SkAlphaType); |
| auto surface(SkSurface::MakeRaster(info)); |
| SkCanvas* canvas = surface->getCanvas(); |
| canvas->drawColor(SK_ColorWHITE); |
| |
| SkPath path; |
| path.setFillType(SkPathFillType::kEvenOdd); |
| |
| path.addRect(SkRect::MakeWH(N/2, N)); |
| path.addRect(SkRect::MakeWH(N, N/2)); |
| path.moveTo(0, 0); path.lineTo(N, 0); path.lineTo(0, N); path.close(); |
| |
| SkPaint paint; |
| paint.setShader(make_shader(SkRect::MakeWH(N, N))); |
| |
| canvas->drawPath(path, paint); |
| return surface->makeImageSnapshot(); |
| } |
| |
| static sk_sp<SkImage> zoom_up(SkSurface* origSurf, SkImage* orig) { |
| const SkScalar S = 16; // amount to scale up |
| const int D = 2; // dimension scaling for the offscreen |
| // since we only view the center, don't need to produce the entire thing |
| |
| SkImageInfo info = SkImageInfo::MakeN32(orig->width() * D, orig->height() * D, |
| kOpaque_SkAlphaType); |
| auto surface(origSurf->makeSurface(info)); |
| SkCanvas* canvas = surface->getCanvas(); |
| canvas->drawColor(SK_ColorWHITE); |
| canvas->scale(S, S); |
| canvas->translate(-SkScalarHalf(orig->width()) * (S - D) / S, |
| -SkScalarHalf(orig->height()) * (S - D) / S); |
| canvas->drawImage(orig, 0, 0, nullptr); |
| |
| if (S > 3) { |
| SkPaint paint; |
| paint.setColor(SK_ColorWHITE); |
| for (int i = 1; i < orig->height(); ++i) { |
| SkScalar y = SkIntToScalar(i); |
| canvas->drawLine(0, y, SkIntToScalar(orig->width()), y, paint); |
| } |
| for (int i = 1; i < orig->width(); ++i) { |
| SkScalar x = SkIntToScalar(i); |
| canvas->drawLine(x, 0, x, SkIntToScalar(orig->height()), paint); |
| } |
| } |
| return surface->makeImageSnapshot(); |
| } |
| |
| struct AnimValue { |
| SkScalar fValue; |
| SkScalar fMin; |
| SkScalar fMax; |
| SkScalar fMod; |
| |
| operator SkScalar() const { return fValue; } |
| |
| void set(SkScalar value, SkScalar min, SkScalar max) { |
| fValue = value; |
| fMin = min; |
| fMax = max; |
| fMod = 0; |
| } |
| |
| void setMod(SkScalar value, SkScalar mod) { |
| fValue = value; |
| fMin = 0; |
| fMax = 0; |
| fMod = mod; |
| } |
| |
| SkScalar inc(SkScalar delta) { |
| fValue += delta; |
| return this->fixUp(); |
| } |
| |
| SkScalar fixUp() { |
| if (fMod) { |
| fValue = SkScalarMod(fValue, fMod); |
| } else { |
| if (fValue > fMax) { |
| fValue = fMax; |
| } else if (fValue < fMin) { |
| fValue = fMin; |
| } |
| } |
| return fValue; |
| } |
| }; |
| |
| static void draw_box_frame(SkCanvas* canvas, int width, int height) { |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setColor(SK_ColorRED); |
| SkRect r = SkRect::MakeIWH(width, height); |
| r.inset(0.5f, 0.5f); |
| canvas->drawRect(r, p); |
| canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), p); |
| canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), p); |
| } |
| |
| class FilterQualityView : public Sample { |
| sk_sp<SkImage> fImage; |
| AnimValue fScale, fAngle; |
| SkSize fCell; |
| SkInterpolator fTrans; |
| SkMSec fCurrTime; |
| bool fShowFatBits; |
| |
| public: |
| FilterQualityView() : fTrans(2, 2), fShowFatBits(true) { |
| fCell.set(256, 256); |
| |
| fScale.set(1, SK_Scalar1 / 8, 1); |
| fAngle.setMod(0, 360); |
| |
| SkScalar values[2]; |
| fTrans.setMirror(true); |
| fTrans.setReset(true); |
| |
| fCurrTime = 0; |
| |
| fTrans.setRepeatCount(999); |
| values[0] = values[1] = 0; |
| fTrans.setKeyFrame(0, fCurrTime, values); |
| values[0] = values[1] = 1; |
| fTrans.setKeyFrame(1, fCurrTime + 2000, values); |
| } |
| |
| protected: |
| SkString name() override { return SkString("FilterQuality"); } |
| |
| bool onChar(SkUnichar uni) override { |
| switch (uni) { |
| case '1': fAngle.inc(-ANGLE_DELTA); return true; |
| case '2': fAngle.inc( ANGLE_DELTA); return true; |
| case '3': fScale.inc(-SCALE_DELTA); return true; |
| case '4': fScale.inc( SCALE_DELTA); return true; |
| case '5': fShowFatBits = !fShowFatBits; return true; |
| default: break; |
| } |
| return false; |
| } |
| |
| void drawTheImage(SkCanvas* canvas, const SkISize& size, SkFilterQuality filter, |
| SkScalar dx, SkScalar dy) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setFilterQuality(filter); |
| |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| canvas->translate(dx, dy); |
| |
| canvas->translate(SkScalarHalf(size.width()), SkScalarHalf(size.height())); |
| canvas->scale(fScale, fScale); |
| canvas->rotate(fAngle); |
| canvas->drawImage(fImage.get(), -SkScalarHalf(fImage->width()), -SkScalarHalf(fImage->height()), |
| &paint); |
| |
| if (false) { |
| acr.restore(); |
| draw_box_frame(canvas, size.width(), size.height()); |
| } |
| } |
| |
| void drawHere(SkCanvas* canvas, SkFilterQuality filter, SkScalar dx, SkScalar dy) { |
| SkCanvas* origCanvas = canvas; |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| SkISize size = SkISize::Make(fImage->width(), fImage->height()); |
| |
| sk_sp<SkSurface> surface; |
| if (fShowFatBits) { |
| // scale up so we don't clip rotations |
| SkImageInfo info = SkImageInfo::MakeN32(fImage->width() * 2, fImage->height() * 2, |
| kOpaque_SkAlphaType); |
| surface = make_surface(canvas, info); |
| canvas = surface->getCanvas(); |
| canvas->drawColor(SK_ColorWHITE); |
| size.set(info.width(), info.height()); |
| } else { |
| canvas->translate(SkScalarHalf(fCell.width() - fImage->width()), |
| SkScalarHalf(fCell.height() - fImage->height())); |
| } |
| this->drawTheImage(canvas, size, filter, dx, dy); |
| |
| if (surface) { |
| sk_sp<SkImage> orig(surface->makeImageSnapshot()); |
| sk_sp<SkImage> zoomed(zoom_up(surface.get(), orig.get())); |
| origCanvas->drawImage(zoomed.get(), |
| SkScalarHalf(fCell.width() - zoomed->width()), |
| SkScalarHalf(fCell.height() - zoomed->height())); |
| } |
| } |
| |
| void drawBorders(SkCanvas* canvas) { |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setColor(SK_ColorBLUE); |
| |
| SkRect r = SkRect::MakeWH(fCell.width() * 2, fCell.height() * 2); |
| r.inset(SK_ScalarHalf, SK_ScalarHalf); |
| canvas->drawRect(r, p); |
| canvas->drawLine(r.left(), r.centerY(), r.right(), r.centerY(), p); |
| canvas->drawLine(r.centerX(), r.top(), r.centerX(), r.bottom(), p); |
| } |
| |
| void onOnceBeforeDraw() override { |
| fImage = make_image(); |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| fCell.set(this->height() / 2, this->height() / 2); |
| |
| SkScalar trans[2]; |
| fTrans.timeToValues(fCurrTime, trans); |
| |
| for (int y = 0; y < 2; ++y) { |
| for (int x = 0; x < 2; ++x) { |
| int index = y * 2 + x; |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->translate(fCell.width() * x, fCell.height() * y); |
| SkRect r = SkRect::MakeWH(fCell.width(), fCell.height()); |
| r.inset(4, 4); |
| canvas->clipRect(r); |
| this->drawHere(canvas, SkFilterQuality(index), trans[0], trans[1]); |
| } |
| } |
| |
| this->drawBorders(canvas); |
| |
| const SkScalar textX = fCell.width() * 2 + 30; |
| |
| SkFont font(nullptr, 36); |
| SkPaint paint; |
| canvas->drawString(SkStringPrintf("%.8g", (float)fScale), textX, 100, font, paint); |
| canvas->drawString(SkStringPrintf("%.8g", (float)fAngle), textX, 150, font, paint); |
| canvas->drawString(SkStringPrintf("%.8g", trans[0] ), textX, 200, font, paint); |
| canvas->drawString(SkStringPrintf("%.8g", trans[1] ), textX, 250, font, paint); |
| } |
| |
| bool onAnimate(double nanos) override { |
| fCurrTime = TimeUtils::NanosToMSec(nanos); |
| return true; |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SAMPLE( return new FilterQualityView(); ) |