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- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "samplecode/Sample.h"
- #include "tools/Resources.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkPoint3.h"
- #include "include/utils/SkShadowUtils.h"
- ////////////////////////////////////////////////////////////////////////////
- // Sample to demonstrate tonal color shadows
- class ShadowColorView : public Sample {
- SkPath fRectPath;
- int fZIndex;
- bool fShowAmbient;
- bool fShowSpot;
- bool fUseAlt;
- bool fShowObject;
- bool fTwoPassColor;
- bool fDarkBackground;
- public:
- ShadowColorView()
- : fZIndex(8)
- , fShowAmbient(true)
- , fShowSpot(true)
- , fUseAlt(false)
- , fShowObject(true)
- , fTwoPassColor(false)
- , fDarkBackground(false) {}
- protected:
- void onOnceBeforeDraw() override {
- fRectPath.addRect(SkRect::MakeXYWH(-50, -50, 100, 100));
- }
- SkString name() override { return SkString("ShadowColor"); }
- bool onChar(SkUnichar uni) override {
- bool handled = false;
- switch (uni) {
- case 'W':
- fShowAmbient = !fShowAmbient;
- handled = true;
- break;
- case 'S':
- fShowSpot = !fShowSpot;
- handled = true;
- break;
- case 'T':
- fUseAlt = !fUseAlt;
- handled = true;
- break;
- case 'O':
- fShowObject = !fShowObject;
- handled = true;
- break;
- case 'X':
- fTwoPassColor = !fTwoPassColor;
- handled = true;
- break;
- case 'Z':
- fDarkBackground = !fDarkBackground;
- handled = true;
- break;
- case '>':
- fZIndex = SkTMin(9, fZIndex+1);
- handled = true;
- break;
- case '<':
- fZIndex = SkTMax(0, fZIndex-1);
- handled = true;
- break;
- default:
- break;
- }
- if (handled) {
- return true;
- }
- return false;
- }
- void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
- const SkPoint3& zPlaneParams,
- const SkPaint& paint, SkScalar ambientAlpha,
- const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
- if (!fShowAmbient) {
- ambientAlpha = 0;
- }
- if (!fShowSpot) {
- spotAlpha = 0;
- }
- uint32_t flags = 0;
- if (fUseAlt) {
- flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
- }
- if (fTwoPassColor) {
- SkColor ambientColor = SkColorSetARGB(ambientAlpha*255, 0, 0, 0);
- SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
- lightPos, lightWidth,
- ambientColor, SK_ColorTRANSPARENT, flags);
- if (paint.getColor() != SK_ColorBLACK) {
- SkColor color = paint.getColor();
- uint8_t max = SkTMax(SkTMax(SkColorGetR(color), SkColorGetG(color)),
- SkColorGetB(color));
- uint8_t min = SkTMin(SkTMin(SkColorGetR(color), SkColorGetG(color)),
- SkColorGetB(color));
- SkScalar luminance = 0.5f*(max + min) / 255.f;
- SkScalar alpha = (.6 - .4*luminance)*luminance*luminance + 0.3f;
- spotAlpha -= (alpha - 0.3f)*.5f;
- SkColor spotColor = SkColorSetARGB(alpha*SkColorGetA(color), SkColorGetR(color),
- SkColorGetG(color), SkColorGetB(color));
- SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
- lightPos, lightWidth,
- SK_ColorTRANSPARENT, spotColor, flags);
- }
- SkColor spotGreyscale = SkColorSetARGB(spotAlpha * 255, 0, 0, 0);
- SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
- lightPos, lightWidth,
- SK_ColorTRANSPARENT, spotGreyscale, flags);
- } else {
- SkColor color = paint.getColor();
- SkColor baseAmbient = SkColorSetARGB(ambientAlpha*SkColorGetA(color),
- SkColorGetR(color), SkColorGetG(color),
- SkColorGetB(color));
- SkColor baseSpot = SkColorSetARGB(spotAlpha*SkColorGetA(color),
- SkColorGetR(color), SkColorGetG(color),
- SkColorGetB(color));
- SkColor tonalAmbient, tonalSpot;
- SkShadowUtils::ComputeTonalColors(baseAmbient, baseSpot, &tonalAmbient, &tonalSpot);
- SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
- lightPos, lightWidth,
- tonalAmbient, tonalSpot, flags);
- }
- if (fShowObject) {
- canvas->drawPath(path, paint);
- } else {
- SkPaint strokePaint;
- strokePaint.setColor(paint.getColor());
- strokePaint.setStyle(SkPaint::kStroke_Style);
- canvas->drawPath(path, strokePaint);
- }
- }
- void onDrawContent(SkCanvas* canvas) override {
- const SkScalar kLightWidth = 600;
- const SkScalar kAmbientAlpha = 0.03f;
- const SkScalar kSpotAlpha = 0.25f;
- const SkScalar kZValues[10] = { 1, 2, 3, 4, 6, 8, 9, 12, 16, 24 };
- const SkColor kColors[30] = {
- // purples
- 0xFF3A0072, 0xFF5D0099, 0xFF7F12B2, 0xFFA02AD1, 0xFFC245E5,
- 0xFFE95AF9, 0xFFFC79F0, 0xFFFDA6F0, 0xFFFFCCF8, 0xFFFFE1F9,
- // oranges
- 0xFFEA3200, 0xFFFF4E00, 0xFFFF7300, 0xFFFF9100, 0xFFFFB000,
- 0xFFFFCE00, 0xFFFFE000, 0xFFFFF64D, 0xFFFFF98F, 0xFFFFFBCC,
- // teals
- 0xFF004D51, 0xFF066266, 0xFF057F7F, 0xFF009999, 0xFF00B2B2,
- 0xFF15CCBE, 0xFF25E5CE, 0xFF2CFFE0, 0xFF80FFEA, 0xFFB3FFF0
- };
- SkFont font;
- SkPaint paint;
- paint.setAntiAlias(true);
- if (fDarkBackground) {
- canvas->drawColor(0xFF111111);
- paint.setColor(SK_ColorWHITE);
- } else {
- canvas->drawColor(0xFFEAEAEA);
- paint.setColor(SK_ColorBLACK);
- }
- if (fTwoPassColor) {
- canvas->drawString("Two pass", 10, 15, font, paint);
- } else {
- canvas->drawString("One pass", 10, 15, font, paint);
- }
- SkPoint3 lightPos = { 75, -400, 600 };
- SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, kZValues[fZIndex]);
- SkScalar yPos = 75;
- for (int row = 0; row < 3; ++row) {
- lightPos.fX = 75;
- SkScalar xPos = 75;
- for (int col = 0; col < 10; ++col) {
- paint.setColor(kColors[10*row + col]);
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 120;
- xPos += 120;
- }
- lightPos.fY += 200;
- yPos += 200;
- }
- }
- private:
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new ShadowColorView(); )
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