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- /*
- * 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/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, 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 && 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:
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new XferDemo; )
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