gm/lightingshaderbevel.cpp - skia - Git at Google

 /*
  * Copyright 2016 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 "sk_tool_utils.h"
 #include "SkLightingShader.h"
 #include "SkNormalSource.h"
 #include "SkPath.h"
 #include "SkPoint3.h"
 #include "SkShader.h"


 namespace skiagm {

 // This GM exercises lighting shaders when used with bevel SkNormalSource objects.
 class LightingShaderBevelGM : public GM {
 public:
     LightingShaderBevelGM() {
         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
     }

 protected:
     SkString onShortName() override {
         return SkString("lightingshaderbevel");
     }

     SkISize onISize() override {
         return SkISize::Make(SkScalarCeilToInt(GRID_NUM_COLUMNS * GRID_CELL_WIDTH),
                              SkScalarCeilToInt(GRID_NUM_ROWS    * GRID_CELL_WIDTH));
     }

     void onOnceBeforeDraw() override {
         SkLights::Builder builder;
         const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0.473f);

         builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, 1.0f),
                                                      kLightFromUpperRight));
         builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
         fLights = builder.finish();

         // fRect is assumed to be square throughout this file
         fRect = SkRect::MakeIWH(kTexSize, kTexSize);
         SkMatrix matrix;
         SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize);
         matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit);

         SkBitmap diffuseMap = sk_tool_utils::create_checkerboard_bitmap(
                 kTexSize, kTexSize,
                 sk_tool_utils::color_to_565(0x0),
                 sk_tool_utils::color_to_565(0xFF804020),
                 8);
         fDiffuse = SkShader::MakeBitmapShader(diffuseMap, SkShader::kClamp_TileMode,
                                               SkShader::kClamp_TileMode, &matrix);

         fConvexPath.moveTo(fRect.width() / 2.0f, 0.0f);
         fConvexPath.lineTo(0.0f, fRect.height());
         fConvexPath.lineTo(fRect.width(), fRect.height());
         fConvexPath.close();

         // Creating concave path
         {
             SkScalar x = 0.0f;
             SkScalar y = fRect.height() / 2.0f;

             const int NUM_SPIKES = 8;

             const SkScalar x0 = x;
             const SkScalar dx = fRect.width() / (NUM_SPIKES * 2);
             const SkScalar dy = SK_Scalar1 * 10;


             fConcavePath.moveTo(x, y + dy);
             for (int i = 0; i < NUM_SPIKES; i++) {
                 x += dx;
                 fConcavePath.lineTo(x, y - dy);
                 x += dx;
                 fConcavePath.lineTo(x, y + dy);
             }
             fConcavePath.lineTo(x, y + (2 * dy));
             fConcavePath.lineTo(x0, y + (2 * dy));
             fConcavePath.close();
         }
     }

     // Scales shape around origin, rotates shape around origin, then translates shape to origin
     void positionCTM(SkCanvas *canvas, SkScalar scaleX, SkScalar scaleY, SkScalar rotate) const {
         canvas->translate(kTexSize/2.0f, kTexSize/2.0f);
         canvas->scale(scaleX, scaleY);
         canvas->rotate(rotate);
         canvas->translate(-kTexSize/2.0f, -kTexSize/2.0f);
     }

     enum Shape {
         kCircle_Shape,
         kRect_Shape,
         kRRect_Shape,
         kConvexPath_Shape,
         kConcavePath_Shape,

         kLast_Shape = kConcavePath_Shape
     };
     void drawShape(enum Shape shape, SkCanvas* canvas, SkScalar scaleX, SkScalar scaleY,
                    SkScalar rotate, SkNormalSource::BevelType bevelType, SkScalar bevelHeight) {
         canvas->save();

         this->positionCTM(canvas, scaleX, scaleY, rotate);

         SkPaint paint;

         SkScalar bevelWidth = 10.0f;
         sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeBevel(bevelType, bevelWidth,
                                                                        bevelHeight);

         paint.setShader(SkLightingShader::Make(fDiffuse, std::move(normalSource), fLights));
         paint.setAntiAlias(true);
         switch(shape) {
             case kCircle_Shape:
                 canvas->drawCircle(fRect.centerX(), fRect.centerY(), fRect.width()/2.0f, paint);
                 break;
             case kRect_Shape:
                 canvas->drawRect(fRect, paint);
                 break;
             case kRRect_Shape:
                 canvas->drawRoundRect(fRect, 5.0f, 5.0f, paint);
                 break;
             case kConvexPath_Shape:
                 canvas->drawPath(fConvexPath, paint);
                 break;
             case kConcavePath_Shape:
                 canvas->drawPath(fConcavePath, paint);
                 break;
             default:
                 SkDEBUGFAIL("Invalid shape enum for drawShape");
         }

         canvas->restore();
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint labelPaint;
         labelPaint.setTypeface(sk_tool_utils::create_portable_typeface("sans-serif",
                                                                        SkFontStyle()));
         labelPaint.setAntiAlias(true);
         labelPaint.setTextSize(LABEL_SIZE);

         int gridNum = 0;

         // Running through all possible parameter combinations
         for (auto bevelType : {SkNormalSource::BevelType::kLinear,
                                SkNormalSource::BevelType::kRoundedIn,
                                SkNormalSource::BevelType::kRoundedOut}) {
             for (SkScalar bevelHeight: {-7.0f, 7.0f}) {
                 for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
                     Shape shape = (Shape)shapeInt;

                     // Determining position
                     SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
                     SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;

                     canvas->save();

                     canvas->translate(xPos, yPos);
                     this->drawShape(shape, canvas, 1.0f, 1.0f, 0.f, bevelType, bevelHeight);
                     // Drawing labels
                     canvas->translate(0.0f, SkIntToScalar(kTexSize));
                     {
                         canvas->translate(0.0f, LABEL_SIZE);
                         SkString label;
                         label.append("bevelType: ");
                         switch (bevelType) {
                             case SkNormalSource::BevelType::kLinear:
                                 label.append("linear");
                                 break;
                             case SkNormalSource::BevelType::kRoundedIn:
                                 label.append("roundedIn");
                                 break;
                             case SkNormalSource::BevelType::kRoundedOut:
                                 label.append("roundedOut");
                                 break;
                         }
                         canvas->drawString(label, 0.0f, 0.0f, labelPaint);
                     }
                     {
                         canvas->translate(0.0f, LABEL_SIZE);
                         SkString label;
                         label.appendf("bevelHeight: %.1f", bevelHeight);
                         canvas->drawString(label, 0.0f, 0.0f, labelPaint);
                     }

                     canvas->restore();

                     gridNum++;
                 }
             }
         }

         // Testing rotation
         for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
             Shape shape = (Shape)shapeInt;

             // Determining position
             SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
             SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;

             canvas->save();

             canvas->translate(xPos, yPos);
             this->drawShape(shape, canvas, SK_ScalarRoot2Over2, SK_ScalarRoot2Over2, 45.0f,
                             SkNormalSource::BevelType::kLinear, 7.0f);

             // Drawing labels
             canvas->translate(0.0f, SkIntToScalar(kTexSize));
             {
                 canvas->translate(0.0f, LABEL_SIZE);
                 SkString label;
                 label.appendf("bevelType: linear");
                 canvas->drawString(label, 0.0f, 0.0f, labelPaint);
             }
             {
                 canvas->translate(0.0f, LABEL_SIZE);
                 SkString label;
                 label.appendf("bevelHeight: %.1f", 7.0f);
                 canvas->drawString(label, 0.0f, 0.0f, labelPaint);
             }
             {
                 canvas->translate(0.0f, LABEL_SIZE);
                 SkString label;
                 label.appendf("rotated");
                 canvas->drawString(label, 0.0f, 0.0f, labelPaint);
             }

             canvas->restore();

             gridNum++;
         }

         // Making sure NUM_COMBINATIONS_PER_SHAPE is set correctly
         SkASSERT(gridNum == (NUM_COMBINATIONS_PER_SHAPE*NUM_SHAPES));
     }

 private:
     static constexpr int kTexSize = 96;
     static constexpr int NUM_SHAPES = kLast_Shape + 1;
     static constexpr int NUM_COMBINATIONS_PER_SHAPE = 7;
     static constexpr int GRID_NUM_ROWS = NUM_SHAPES;
     static constexpr int GRID_NUM_COLUMNS = NUM_COMBINATIONS_PER_SHAPE;
     static constexpr SkScalar LABEL_SIZE = 10.0f;
     static constexpr int NUM_LABELS_PER_CELL = 3;
     static constexpr SkScalar GRID_CELL_WIDTH = kTexSize + 10.0f + NUM_LABELS_PER_CELL * LABEL_SIZE;

     sk_sp<SkShader> fDiffuse;

     SkRect fRect;
     SkPath fConvexPath;
     SkPath fConcavePath;
     sk_sp<SkLights> fLights;

     typedef GM INHERITED;
 };

 //////////////////////////////////////////////////////////////////////////////

 DEF_GM(return new LightingShaderBevelGM;)
 }
	/*
	* Copyright 2016 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 "sk_tool_utils.h"
	#include "SkLightingShader.h"
	#include "SkNormalSource.h"
	#include "SkPath.h"
	#include "SkPoint3.h"
	#include "SkShader.h"


	namespace skiagm {

	// This GM exercises lighting shaders when used with bevel SkNormalSource objects.
	class LightingShaderBevelGM : public GM {
	public:
	LightingShaderBevelGM() {
	this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
	}

	protected:
	SkString onShortName() override {
	return SkString("lightingshaderbevel");
	}

	SkISize onISize() override {
	return SkISize::Make(SkScalarCeilToInt(GRID_NUM_COLUMNS * GRID_CELL_WIDTH),
	SkScalarCeilToInt(GRID_NUM_ROWS * GRID_CELL_WIDTH));
	}

	void onOnceBeforeDraw() override {
	SkLights::Builder builder;
	const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0.473f);

	builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, 1.0f),
	kLightFromUpperRight));
	builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
	fLights = builder.finish();

	// fRect is assumed to be square throughout this file
	fRect = SkRect::MakeIWH(kTexSize, kTexSize);
	SkMatrix matrix;
	SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize);
	matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit);

	SkBitmap diffuseMap = sk_tool_utils::create_checkerboard_bitmap(
	kTexSize, kTexSize,
	sk_tool_utils::color_to_565(0x0),
	sk_tool_utils::color_to_565(0xFF804020),
	8);
	fDiffuse = SkShader::MakeBitmapShader(diffuseMap, SkShader::kClamp_TileMode,
	SkShader::kClamp_TileMode, &matrix);

	fConvexPath.moveTo(fRect.width() / 2.0f, 0.0f);
	fConvexPath.lineTo(0.0f, fRect.height());
	fConvexPath.lineTo(fRect.width(), fRect.height());
	fConvexPath.close();

	// Creating concave path
	{
	SkScalar x = 0.0f;
	SkScalar y = fRect.height() / 2.0f;

	const int NUM_SPIKES = 8;

	const SkScalar x0 = x;
	const SkScalar dx = fRect.width() / (NUM_SPIKES * 2);
	const SkScalar dy = SK_Scalar1 * 10;


	fConcavePath.moveTo(x, y + dy);
	for (int i = 0; i < NUM_SPIKES; i++) {
	x += dx;
	fConcavePath.lineTo(x, y - dy);
	x += dx;
	fConcavePath.lineTo(x, y + dy);
	}
	fConcavePath.lineTo(x, y + (2 * dy));
	fConcavePath.lineTo(x0, y + (2 * dy));
	fConcavePath.close();
	}
	}

	// Scales shape around origin, rotates shape around origin, then translates shape to origin
	void positionCTM(SkCanvas *canvas, SkScalar scaleX, SkScalar scaleY, SkScalar rotate) const {
	canvas->translate(kTexSize/2.0f, kTexSize/2.0f);
	canvas->scale(scaleX, scaleY);
	canvas->rotate(rotate);
	canvas->translate(-kTexSize/2.0f, -kTexSize/2.0f);
	}

	enum Shape {
	kCircle_Shape,
	kRect_Shape,
	kRRect_Shape,
	kConvexPath_Shape,
	kConcavePath_Shape,

	kLast_Shape = kConcavePath_Shape
	};
	void drawShape(enum Shape shape, SkCanvas* canvas, SkScalar scaleX, SkScalar scaleY,
	SkScalar rotate, SkNormalSource::BevelType bevelType, SkScalar bevelHeight) {
	canvas->save();

	this->positionCTM(canvas, scaleX, scaleY, rotate);

	SkPaint paint;

	SkScalar bevelWidth = 10.0f;
	sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeBevel(bevelType, bevelWidth,
	bevelHeight);

	paint.setShader(SkLightingShader::Make(fDiffuse, std::move(normalSource), fLights));
	paint.setAntiAlias(true);
	switch(shape) {
	case kCircle_Shape:
	canvas->drawCircle(fRect.centerX(), fRect.centerY(), fRect.width()/2.0f, paint);
	break;
	case kRect_Shape:
	canvas->drawRect(fRect, paint);
	break;
	case kRRect_Shape:
	canvas->drawRoundRect(fRect, 5.0f, 5.0f, paint);
	break;
	case kConvexPath_Shape:
	canvas->drawPath(fConvexPath, paint);
	break;
	case kConcavePath_Shape:
	canvas->drawPath(fConcavePath, paint);
	break;
	default:
	SkDEBUGFAIL("Invalid shape enum for drawShape");
	}

	canvas->restore();
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint labelPaint;
	labelPaint.setTypeface(sk_tool_utils::create_portable_typeface("sans-serif",
	SkFontStyle()));
	labelPaint.setAntiAlias(true);
	labelPaint.setTextSize(LABEL_SIZE);

	int gridNum = 0;

	// Running through all possible parameter combinations
	for (auto bevelType : {SkNormalSource::BevelType::kLinear,
	SkNormalSource::BevelType::kRoundedIn,
	SkNormalSource::BevelType::kRoundedOut}) {
	for (SkScalar bevelHeight: {-7.0f, 7.0f}) {
	for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
	Shape shape = (Shape)shapeInt;

	// Determining position
	SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
	SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;

	canvas->save();

	canvas->translate(xPos, yPos);
	this->drawShape(shape, canvas, 1.0f, 1.0f, 0.f, bevelType, bevelHeight);
	// Drawing labels
	canvas->translate(0.0f, SkIntToScalar(kTexSize));
	{
	canvas->translate(0.0f, LABEL_SIZE);
	SkString label;
	label.append("bevelType: ");
	switch (bevelType) {
	case SkNormalSource::BevelType::kLinear:
	label.append("linear");
	break;
	case SkNormalSource::BevelType::kRoundedIn:
	label.append("roundedIn");
	break;
	case SkNormalSource::BevelType::kRoundedOut:
	label.append("roundedOut");
	break;
	}
	canvas->drawString(label, 0.0f, 0.0f, labelPaint);
	}
	{
	canvas->translate(0.0f, LABEL_SIZE);
	SkString label;
	label.appendf("bevelHeight: %.1f", bevelHeight);
	canvas->drawString(label, 0.0f, 0.0f, labelPaint);
	}

	canvas->restore();

	gridNum++;
	}
	}
	}

	// Testing rotation
	for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
	Shape shape = (Shape)shapeInt;

	// Determining position
	SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
	SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;

	canvas->save();

	canvas->translate(xPos, yPos);
	this->drawShape(shape, canvas, SK_ScalarRoot2Over2, SK_ScalarRoot2Over2, 45.0f,
	SkNormalSource::BevelType::kLinear, 7.0f);

	// Drawing labels
	canvas->translate(0.0f, SkIntToScalar(kTexSize));
	{
	canvas->translate(0.0f, LABEL_SIZE);
	SkString label;
	label.appendf("bevelType: linear");
	canvas->drawString(label, 0.0f, 0.0f, labelPaint);
	}
	{
	canvas->translate(0.0f, LABEL_SIZE);
	SkString label;
	label.appendf("bevelHeight: %.1f", 7.0f);
	canvas->drawString(label, 0.0f, 0.0f, labelPaint);
	}
	{
	canvas->translate(0.0f, LABEL_SIZE);
	SkString label;
	label.appendf("rotated");
	canvas->drawString(label, 0.0f, 0.0f, labelPaint);
	}

	canvas->restore();

	gridNum++;
	}

	// Making sure NUM_COMBINATIONS_PER_SHAPE is set correctly
	SkASSERT(gridNum == (NUM_COMBINATIONS_PER_SHAPE*NUM_SHAPES));
	}

	private:
	static constexpr int kTexSize = 96;
	static constexpr int NUM_SHAPES = kLast_Shape + 1;
	static constexpr int NUM_COMBINATIONS_PER_SHAPE = 7;
	static constexpr int GRID_NUM_ROWS = NUM_SHAPES;
	static constexpr int GRID_NUM_COLUMNS = NUM_COMBINATIONS_PER_SHAPE;
	static constexpr SkScalar LABEL_SIZE = 10.0f;
	static constexpr int NUM_LABELS_PER_CELL = 3;
	static constexpr SkScalar GRID_CELL_WIDTH = kTexSize + 10.0f + NUM_LABELS_PER_CELL * LABEL_SIZE;

	sk_sp<SkShader> fDiffuse;

	SkRect fRect;
	SkPath fConvexPath;
	SkPath fConcavePath;
	sk_sp<SkLights> fLights;

	typedef GM INHERITED;
	};

	//////////////////////////////////////////////////////////////////////////////

	DEF_GM(return new LightingShaderBevelGM;)
	}