| /* |
| * 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/SkDrawable.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRSXform.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/utils/SkRandom.h" |
| #include "include/utils/SkTextUtils.h" |
| #include "samplecode/Sample.h" |
| |
| const SkBlendMode gModes[] = { |
| SkBlendMode::kSrcOver, |
| SkBlendMode::kSrc, |
| SkBlendMode::kSrcIn, |
| SkBlendMode::kSrcOut, |
| SkBlendMode::kSrcATop, |
| SkBlendMode::kDstOver, |
| SkBlendMode::kDstIn, |
| SkBlendMode::kDstOut, |
| SkBlendMode::kDstATop, |
| }; |
| const int N_Modes = SK_ARRAY_COUNT(gModes); |
| |
| static SkRandom gRand; |
| |
| struct ModeButton { |
| SkString fLabel; |
| SkColor fColor; |
| SkRect fRect; |
| |
| public: |
| void init(const char label[], const SkRect& rect) { |
| fLabel = label; |
| fRect = rect; |
| fColor = (gRand.nextU() & 0x7F7F7F7F) | SkColorSetARGB(0xFF, 0, 0, 0x80); |
| } |
| |
| void draw(SkCanvas* canvas) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setColor(fColor); |
| canvas->drawRoundRect(fRect, 8, 8, paint); |
| |
| paint.setColor(0xFFFFFFFF); |
| SkFont font; |
| font.setSize(16); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| SkTextUtils::DrawString(canvas, fLabel.c_str(), fRect.centerX(), fRect.fTop + 0.68f * fRect.height(), |
| font, paint, SkTextUtils::kCenter_Align); |
| } |
| |
| bool hitTest(SkScalar x, SkScalar y) { |
| return fRect.intersects({x - 1, y - 1, x + 1, y + 1}); |
| } |
| }; |
| |
| class ModeDrawable : public SkDrawable { |
| public: |
| ModeDrawable() : fMode(SkBlendMode::kSrcOver), fLoc(SkPoint::Make(0, 0)) {} |
| |
| SkBlendMode fMode; |
| SkPoint fLoc; |
| |
| bool hitTest(SkScalar x, SkScalar y) { |
| SkRect target = SkRect::MakeXYWH(x - fLoc.x() - 1, y - fLoc.y() - 1, 3, 3); |
| return this->getBounds().intersects(target); |
| } |
| }; |
| |
| class CircDrawable : public ModeDrawable { |
| SkPaint fPaint; |
| SkRect fBounds; |
| |
| public: |
| CircDrawable(SkScalar size, SkColor c) { |
| const SkColor colors[] = { 0, c }; |
| fPaint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(size/2, size/2), size/2, |
| colors, nullptr, 2, |
| SkTileMode::kClamp)); |
| fBounds = SkRect::MakeWH(size, size); |
| } |
| |
| protected: |
| SkRect onGetBounds() override { |
| return fBounds; |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| fPaint.setBlendMode(fMode); |
| canvas->save(); |
| canvas->translate(fLoc.x(), fLoc.y()); |
| canvas->drawOval(fBounds, fPaint); |
| canvas->restore(); |
| } |
| }; |
| |
| class XferDemo : public Sample { |
| enum { |
| N = 4 |
| }; |
| |
| SkRect fModeRect[N_Modes]; |
| ModeButton fModeButtons[N_Modes]; |
| sk_sp<CircDrawable> fDrs[N]; |
| CircDrawable* fSelected; |
| |
| void addButtons() { |
| SkScalar x = 10; |
| SkScalar y = 10; |
| for (int i = 0; i < N_Modes; ++i) { |
| fModeButtons[i].init(SkBlendMode_Name(gModes[i]), SkRect::MakeXYWH(x, y, 70, 25)); |
| fModeRect[i] = SkRect::MakeXYWH(x, y + 28, 70, 2); |
| x += 80; |
| } |
| } |
| |
| public: |
| XferDemo() { |
| const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK }; |
| for (int i = 0; i < N; ++i) { |
| fDrs[i].reset(new CircDrawable(200, colors[i])); |
| fDrs[i]->fLoc.set(100.f + i * 100, 100.f + i * 100); |
| fDrs[i]->fMode = SkBlendMode::kSrcOver; |
| } |
| fSelected = nullptr; |
| |
| this->addButtons(); |
| } |
| |
| protected: |
| SkString name() override { return SkString("XferDemo"); } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| for (int i = 0; i < N_Modes; ++i) { |
| fModeButtons[i].draw(canvas); |
| } |
| |
| SkPaint paint; |
| if (fSelected) { |
| for (int i = 0; i < N_Modes; ++i) { |
| if (fSelected->fMode == gModes[i]) { |
| canvas->drawRect(fModeRect[i], paint); |
| break; |
| } |
| } |
| } |
| |
| canvas->saveLayer(nullptr, nullptr); |
| for (int i = 0; i < N; ++i) { |
| fDrs[i]->draw(canvas); |
| } |
| canvas->restore(); |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override { |
| // Check mode buttons first |
| for (int i = 0; i < N_Modes; ++i) { |
| if (fModeButtons[i].hitTest(x, y)) { |
| Click* click = new Click(); |
| click->fMeta.setS32("mode", i); |
| return click; |
| } |
| } |
| fSelected = nullptr; |
| for (int i = N - 1; i >= 0; --i) { |
| if (fDrs[i]->hitTest(x, y)) { |
| fSelected = fDrs[i].get(); |
| break; |
| } |
| } |
| return fSelected ? new Click() : nullptr; |
| } |
| |
| bool onClick(Click* click) override { |
| int32_t mode; |
| if (click->fMeta.findS32("mode", &mode)) { |
| if (fSelected && skui::InputState::kUp == click->fState) { |
| fSelected->fMode = gModes[mode]; |
| } |
| } else { |
| fSelected->fLoc.fX += click->fCurr.fX - click->fPrev.fX; |
| fSelected->fLoc.fY += click->fCurr.fY - click->fPrev.fY; |
| } |
| return true; |
| } |
| |
| private: |
| using INHERITED = Sample; |
| }; |
| DEF_SAMPLE( return new XferDemo; ) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tools/Resources.h" |
| |
| class CubicResamplerDemo : public Sample { |
| struct Rec { |
| sk_sp<SkImage> fImage; |
| SkRect fBounds; |
| |
| void draw(SkCanvas* canvas, SkCubicResampler cubic) const { |
| SkRect r = fBounds; |
| SkPaint paint; |
| |
| SkMatrix lm = SkMatrix::Translate(r.x(), r.y()) |
| * SkMatrix::Scale(10, 10); |
| paint.setShader(fImage->makeShader(SkSamplingOptions(), lm)); |
| canvas->drawRect(r, paint); |
| |
| r.offset(r.width() + 10, 0); |
| lm.postTranslate(r.width() + 10, 0); |
| |
| paint.setShader(fImage->makeShader(SkSamplingOptions(SkFilterMode::kLinear), lm)); |
| canvas->drawRect(r, paint); |
| |
| r.offset(r.width() + 10, 0); |
| lm.postTranslate(r.width() + 10, 0); |
| |
| paint.setShader(fImage->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, |
| SkSamplingOptions(cubic), &lm)); |
| canvas->drawRect(r, paint); |
| } |
| }; |
| std::vector<Rec> fRecs; |
| |
| public: |
| CubicResamplerDemo() { |
| const char* names[] = { |
| "images/mandrill_128.png", |
| "images/rle.bmp", |
| "images/example_4.png", |
| }; |
| SkRect r = {10, 10, 200, 200}; |
| for (auto name : names) { |
| fRecs.push_back({GetResourceAsImage(name), r}); |
| r.offset(0, r.height() + 10); |
| } |
| |
| fDomain.setXYWH(r.fLeft + 3*r.width() + 40, 50, 200, 200); |
| fCubic = {.3f, .5f}; |
| } |
| |
| protected: |
| SkString name() override { return SkString("CubicResampler"); } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| for (const auto& rec : fRecs) { |
| rec.draw(canvas, fCubic); |
| } |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| canvas->drawRect(fDomain, paint); |
| |
| paint.setColor(SK_ColorRED); |
| paint.setStroke(false); |
| SkPoint loc = SkMatrix::RectToRect({0,0,1,1}, fDomain).mapXY(fCubic.B, fCubic.C); |
| canvas->drawCircle(loc.fX, loc.fY, 8, paint); |
| |
| SkString str; |
| str.printf("B=%4.2f C=%4.2f", fCubic.B, fCubic.C); |
| SkFont font; |
| font.setSize(25); |
| font.setEdging(SkFont::Edging::kAntiAlias); |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawSimpleText(str.c_str(), str.size(), SkTextEncoding::kUTF8, |
| fDomain.fLeft + 10, fDomain.fBottom + 40, font, paint); |
| } |
| |
| static float pin_unitize(float min, float max, float value) { |
| return (std::min(std::max(value, min), max) - min) / (max - min); |
| } |
| static SkPoint pin_unitize(const SkRect& r, SkPoint p) { |
| return { |
| pin_unitize(r.fLeft, r.fRight, p.fX), |
| pin_unitize(r.fTop, r.fBottom, p.fY), |
| }; |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override { |
| if (fDomain.contains(x, y)) { |
| return new Click([this](Click* click) { |
| auto [B, C] = pin_unitize(fDomain, click->fCurr); |
| fCubic = {B, C}; |
| return true; |
| }); |
| } |
| return nullptr; |
| } |
| |
| private: |
| SkRect fDomain; |
| SkImage::CubicResampler fCubic; |
| |
| using INHERITED = Sample; |
| }; |
| DEF_SAMPLE( return new CubicResamplerDemo; ) |