gm/flippity.cpp - platform/external/skia - Gitiles

 /*
  * 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 "gm.h"
 #include "sk_tool_utils.h"

 #include "SkSurface.h"

 #include "GrContextPriv.h"
 #include "ProxyUtils.h"
 #include "SkImage_Gpu.h"

 static const int kNumMatrices = 6;
 static const int kImageSize = 128;
 static const int kLabelSize = 32;
 static const int kNumLabels = 4;
 static const int kInset = 16;

 static const int kCellSize = kImageSize+2*kLabelSize;
 static const int kGMWidth  = kNumMatrices*kCellSize;
 static const int kGMHeight = 4*kCellSize;

 static const SkPoint kPoints[kNumLabels] = {
     {          0, kImageSize },     // LL
     { kImageSize, kImageSize },     // LR
     {          0,          0 },     // UL
     { kImageSize,          0 },     // UR
 };

 static const SkMatrix kUVMatrices[kNumMatrices] = {
     SkMatrix::MakeAll( 0, -1, 1,
                       -1,  0, 1,
                        0,  0, 1),
     SkMatrix::MakeAll( 1,  0, 0,
                        0, -1, 1,
                        0,  0, 1),
     // flip x
     SkMatrix::MakeAll(-1,  0, 1,
                        0,  1, 0,
                        0,  0, 1),
     SkMatrix::MakeAll( 0,  1, 0,
                       -1,  0, 1,
                        0,  0, 1),
     // flip both x & y == rotate 180
     SkMatrix::MakeAll(-1,  0, 1,
                        0, -1, 1,
                        0,  0, 1),
     // identity
     SkMatrix::MakeAll(1,  0, 0,
                       0,  1, 0,
                       0,  0, 1)
 };


 // Create a fixed size text label like "LL" or "LR".
 static sk_sp<SkImage> make_text_image(GrContext* context, const char* text, SkColor color) {
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setColor(color);

     SkFont font;
     font.setEdging(SkFont::Edging::kAntiAlias);
     font.setTypeface(sk_tool_utils::create_portable_typeface());
     font.setSize(32);

     SkRect bounds;
     font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds);
     const SkMatrix mat = SkMatrix::MakeRectToRect(bounds, SkRect::MakeWH(kLabelSize, kLabelSize),
                                                   SkMatrix::kFill_ScaleToFit);

     const SkImageInfo ii = SkImageInfo::MakeN32Premul(kLabelSize, kLabelSize);
     sk_sp<SkSurface> surf = SkSurface::MakeRaster(ii);

     SkCanvas* canvas = surf->getCanvas();

     canvas->clear(SK_ColorWHITE);
     canvas->concat(mat);
     canvas->drawSimpleText(text, strlen(text), kUTF8_SkTextEncoding, 0, 0, font, paint);

     sk_sp<SkImage> image = surf->makeImageSnapshot();

     return image->makeTextureImage(context, nullptr);
 }

 // Create an image with each corner marked w/ "LL", "LR", etc., with the origin either bottom-left
 // or top-left.
 static sk_sp<SkImage> make_reference_image(GrContext* context,
                                            const SkTArray<sk_sp<SkImage>>& labels,
                                            bool bottomLeftOrigin) {
     SkASSERT(kNumLabels == labels.count());

     SkImageInfo ii =
             SkImageInfo::Make(kImageSize, kImageSize, kRGBA_8888_SkColorType, kOpaque_SkAlphaType);
     SkBitmap bm;
     bm.allocPixels(ii);
     SkCanvas canvas(bm);

     canvas.clear(SK_ColorWHITE);
     for (int i = 0; i < kNumLabels; ++i) {
         canvas.drawImage(labels[i],
                          0.0 != kPoints[i].fX ? kPoints[i].fX-kLabelSize-kInset : kInset,
                          0.0 != kPoints[i].fY ? kPoints[i].fY-kLabelSize-kInset : kInset);
     }

     auto origin = bottomLeftOrigin ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;

     auto proxy = sk_gpu_test::MakeTextureProxyFromData(context, false, kImageSize, kImageSize,
                                                        bm.colorType(), origin, bm.getPixels(),
                                                        bm.rowBytes());
     if (!proxy) {
         return nullptr;
     }

     return sk_make_sp<SkImage_Gpu>(sk_ref_sp(context), kNeedNewImageUniqueID, kOpaque_SkAlphaType,
                                    std::move(proxy), nullptr);
 }

 // Here we're converting from a matrix that is intended for UVs to a matrix that is intended
 // for rect geometry used for a drawImage call. They are, in some sense, inverses of each
 // other but we also need a scale to map from the [0..1] uv range to the actual size of
 // image.
 static bool UVMatToGeomMatForImage(SkMatrix* geomMat, const SkMatrix& uvMat) {

     const SkMatrix yFlip = SkMatrix::MakeAll(1, 0, 0, 0, -1, 1, 0, 0, 1);

     SkMatrix tmp = uvMat;
     tmp.preConcat(yFlip);
     tmp.preScale(1.0f/kImageSize, 1.0f/kImageSize);

     tmp.postConcat(yFlip);
     tmp.postScale(kImageSize, kImageSize);

     return tmp.invert(geomMat);
 }

 // This GM exercises drawImage with a set of matrices that use an unusual amount of flips and
 // rotates.
 class FlippityGM : public skiagm::GpuGM {
 public:
     FlippityGM() {
         this->setBGColor(0xFFCCCCCC);
     }

 protected:

     SkString onShortName() override {
         return SkString("flippity");
     }

     SkISize onISize() override {
         return SkISize::Make(kGMWidth, kGMHeight);
     }

     // Draw the reference image and the four corner labels in the matrix's coordinate space
     void drawImageWithMatrixAndLabels(SkCanvas* canvas, SkImage* image, int matIndex,
                                       bool drawSubset, bool drawScaled) {
         static const SkRect kSubsets[kNumMatrices] = {
             SkRect::MakeXYWH(kInset, 0, kImageSize-kInset, kImageSize),
             SkRect::MakeXYWH(0, kInset, kImageSize, kImageSize-kInset),
             SkRect::MakeXYWH(0, 0, kImageSize-kInset, kImageSize),
             SkRect::MakeXYWH(0, 0, kImageSize, kImageSize-kInset),
             SkRect::MakeXYWH(kInset/2, kInset/2, kImageSize-kInset, kImageSize-kInset),
             SkRect::MakeXYWH(kInset, kInset, kImageSize-2*kInset, kImageSize-2*kInset),
         };

         SkMatrix imageGeomMat;
         SkAssertResult(UVMatToGeomMatForImage(&imageGeomMat, kUVMatrices[matIndex]));

         canvas->save();

             // draw the reference image
             canvas->concat(imageGeomMat);
             if (drawSubset) {
                 canvas->drawImageRect(image, kSubsets[matIndex],
                                       drawScaled ? SkRect::MakeWH(kImageSize, kImageSize)
                                                  : kSubsets[matIndex],
                                       nullptr, SkCanvas::kFast_SrcRectConstraint);
             } else {
                 canvas->drawImage(image, 0, 0);
             }

             // draw the labels
             for (int i = 0; i < kNumLabels; ++i) {
                 canvas->drawImage(fLabels[i],
                                     0.0f == kPoints[i].fX ? -kLabelSize : kPoints[i].fX,
                                     0.0f == kPoints[i].fY ? -kLabelSize : kPoints[i].fY);
             }
         canvas->restore();
     }

     void drawRow(GrContext* context, SkCanvas* canvas,
                  bool bottomLeftImage, bool drawSubset, bool drawScaled) {

         sk_sp<SkImage> referenceImage = make_reference_image(context, fLabels, bottomLeftImage);

         canvas->save();
             canvas->translate(kLabelSize, kLabelSize);

             for (int i = 0; i < kNumMatrices; ++i) {
                 this->drawImageWithMatrixAndLabels(canvas, referenceImage.get(), i,
                                                    drawSubset, drawScaled);
                 canvas->translate(kCellSize, 0);
             }
         canvas->restore();
     }

     void makeLabels(GrContext* context) {
         static const char* kLabelText[kNumLabels] = { "LL", "LR", "UL", "UR" };

         static const SkColor kLabelColors[kNumLabels] = {
             SK_ColorRED,
             SK_ColorGREEN,
             SK_ColorBLUE,
             SK_ColorCYAN
         };

         SkASSERT(!fLabels.count());
         for (int i = 0; i < kNumLabels; ++i) {
             fLabels.push_back(make_text_image(context, kLabelText[i], kLabelColors[i]));
         }
         SkASSERT(kNumLabels == fLabels.count());
     }

     void onDraw(GrContext* context, GrRenderTargetContext*, SkCanvas* canvas) override {
         this->makeLabels(context);

         canvas->save();

         // Top row gets TL image
         this->drawRow(context, canvas, false, false, false);

         canvas->translate(0, kCellSize);

         // Bottom row gets BL image
         this->drawRow(context, canvas, true, false, false);

         canvas->translate(0, kCellSize);

         // Third row gets subsets of BL images
         this->drawRow(context, canvas, true, true, false);

         canvas->translate(0, kCellSize);

         // Fourth row gets scaled subsets of BL images
         this->drawRow(context, canvas, true, true, true);

         canvas->restore();

         // separator grid
         for (int i = 0; i < 4; ++i) {
             canvas->drawLine(0, i * kCellSize, kGMWidth, i * kCellSize, SkPaint());
         }
         for (int i = 0; i < kNumMatrices; ++i) {
             canvas->drawLine(i * kCellSize, 0, i * kCellSize, kGMHeight, SkPaint());
         }
     }

 private:
     SkTArray<sk_sp<SkImage>> fLabels;

     typedef GM INHERITED;
 };

 DEF_GM(return new FlippityGM;)
	/*
	* 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 "gm.h"
	#include "sk_tool_utils.h"

	#include "SkSurface.h"

	#include "GrContextPriv.h"
	#include "ProxyUtils.h"
	#include "SkImage_Gpu.h"

	static const int kNumMatrices = 6;
	static const int kImageSize = 128;
	static const int kLabelSize = 32;
	static const int kNumLabels = 4;
	static const int kInset = 16;

	static const int kCellSize = kImageSize+2*kLabelSize;
	static const int kGMWidth = kNumMatrices*kCellSize;
	static const int kGMHeight = 4*kCellSize;

	static const SkPoint kPoints[kNumLabels] = {
	{ 0, kImageSize }, // LL
	{ kImageSize, kImageSize }, // LR
	{ 0, 0 }, // UL
	{ kImageSize, 0 }, // UR
	};

	static const SkMatrix kUVMatrices[kNumMatrices] = {
	SkMatrix::MakeAll( 0, -1, 1,
	-1, 0, 1,
	0, 0, 1),
	SkMatrix::MakeAll( 1, 0, 0,
	0, -1, 1,
	0, 0, 1),
	// flip x
	SkMatrix::MakeAll(-1, 0, 1,
	0, 1, 0,
	0, 0, 1),
	SkMatrix::MakeAll( 0, 1, 0,
	-1, 0, 1,
	0, 0, 1),
	// flip both x & y == rotate 180
	SkMatrix::MakeAll(-1, 0, 1,
	0, -1, 1,
	0, 0, 1),
	// identity
	SkMatrix::MakeAll(1, 0, 0,
	0, 1, 0,
	0, 0, 1)
	};


	// Create a fixed size text label like "LL" or "LR".
	static sk_sp<SkImage> make_text_image(GrContext* context, const char* text, SkColor color) {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setColor(color);

	SkFont font;
	font.setEdging(SkFont::Edging::kAntiAlias);
	font.setTypeface(sk_tool_utils::create_portable_typeface());
	font.setSize(32);

	SkRect bounds;
	font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds);
	const SkMatrix mat = SkMatrix::MakeRectToRect(bounds, SkRect::MakeWH(kLabelSize, kLabelSize),
	SkMatrix::kFill_ScaleToFit);

	const SkImageInfo ii = SkImageInfo::MakeN32Premul(kLabelSize, kLabelSize);
	sk_sp<SkSurface> surf = SkSurface::MakeRaster(ii);

	SkCanvas* canvas = surf->getCanvas();

	canvas->clear(SK_ColorWHITE);
	canvas->concat(mat);
	canvas->drawSimpleText(text, strlen(text), kUTF8_SkTextEncoding, 0, 0, font, paint);

	sk_sp<SkImage> image = surf->makeImageSnapshot();

	return image->makeTextureImage(context, nullptr);
	}

	// Create an image with each corner marked w/ "LL", "LR", etc., with the origin either bottom-left
	// or top-left.
	static sk_sp<SkImage> make_reference_image(GrContext* context,
	const SkTArray<sk_sp<SkImage>>& labels,
	bool bottomLeftOrigin) {
	SkASSERT(kNumLabels == labels.count());

	SkImageInfo ii =
	SkImageInfo::Make(kImageSize, kImageSize, kRGBA_8888_SkColorType, kOpaque_SkAlphaType);
	SkBitmap bm;
	bm.allocPixels(ii);
	SkCanvas canvas(bm);

	canvas.clear(SK_ColorWHITE);
	for (int i = 0; i < kNumLabels; ++i) {
	canvas.drawImage(labels[i],
	0.0 != kPoints[i].fX ? kPoints[i].fX-kLabelSize-kInset : kInset,
	0.0 != kPoints[i].fY ? kPoints[i].fY-kLabelSize-kInset : kInset);
	}

	auto origin = bottomLeftOrigin ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;

	auto proxy = sk_gpu_test::MakeTextureProxyFromData(context, false, kImageSize, kImageSize,
	bm.colorType(), origin, bm.getPixels(),
	bm.rowBytes());
	if (!proxy) {
	return nullptr;
	}

	return sk_make_sp<SkImage_Gpu>(sk_ref_sp(context), kNeedNewImageUniqueID, kOpaque_SkAlphaType,
	std::move(proxy), nullptr);
	}

	// Here we're converting from a matrix that is intended for UVs to a matrix that is intended
	// for rect geometry used for a drawImage call. They are, in some sense, inverses of each
	// other but we also need a scale to map from the [0..1] uv range to the actual size of
	// image.
	static bool UVMatToGeomMatForImage(SkMatrix* geomMat, const SkMatrix& uvMat) {

	const SkMatrix yFlip = SkMatrix::MakeAll(1, 0, 0, 0, -1, 1, 0, 0, 1);

	SkMatrix tmp = uvMat;
	tmp.preConcat(yFlip);
	tmp.preScale(1.0f/kImageSize, 1.0f/kImageSize);

	tmp.postConcat(yFlip);
	tmp.postScale(kImageSize, kImageSize);

	return tmp.invert(geomMat);
	}

	// This GM exercises drawImage with a set of matrices that use an unusual amount of flips and
	// rotates.
	class FlippityGM : public skiagm::GpuGM {
	public:
	FlippityGM() {
	this->setBGColor(0xFFCCCCCC);
	}

	protected:

	SkString onShortName() override {
	return SkString("flippity");
	}

	SkISize onISize() override {
	return SkISize::Make(kGMWidth, kGMHeight);
	}

	// Draw the reference image and the four corner labels in the matrix's coordinate space
	void drawImageWithMatrixAndLabels(SkCanvas* canvas, SkImage* image, int matIndex,
	bool drawSubset, bool drawScaled) {
	static const SkRect kSubsets[kNumMatrices] = {
	SkRect::MakeXYWH(kInset, 0, kImageSize-kInset, kImageSize),
	SkRect::MakeXYWH(0, kInset, kImageSize, kImageSize-kInset),
	SkRect::MakeXYWH(0, 0, kImageSize-kInset, kImageSize),
	SkRect::MakeXYWH(0, 0, kImageSize, kImageSize-kInset),
	SkRect::MakeXYWH(kInset/2, kInset/2, kImageSize-kInset, kImageSize-kInset),
	SkRect::MakeXYWH(kInset, kInset, kImageSize-2kInset, kImageSize-2kInset),
	};

	SkMatrix imageGeomMat;
	SkAssertResult(UVMatToGeomMatForImage(&imageGeomMat, kUVMatrices[matIndex]));

	canvas->save();

	// draw the reference image
	canvas->concat(imageGeomMat);
	if (drawSubset) {
	canvas->drawImageRect(image, kSubsets[matIndex],
	drawScaled ? SkRect::MakeWH(kImageSize, kImageSize)
	: kSubsets[matIndex],
	nullptr, SkCanvas::kFast_SrcRectConstraint);
	} else {
	canvas->drawImage(image, 0, 0);
	}

	// draw the labels
	for (int i = 0; i < kNumLabels; ++i) {
	canvas->drawImage(fLabels[i],
	0.0f == kPoints[i].fX ? -kLabelSize : kPoints[i].fX,
	0.0f == kPoints[i].fY ? -kLabelSize : kPoints[i].fY);
	}
	canvas->restore();
	}

	void drawRow(GrContext* context, SkCanvas* canvas,
	bool bottomLeftImage, bool drawSubset, bool drawScaled) {

	sk_sp<SkImage> referenceImage = make_reference_image(context, fLabels, bottomLeftImage);

	canvas->save();
	canvas->translate(kLabelSize, kLabelSize);

	for (int i = 0; i < kNumMatrices; ++i) {
	this->drawImageWithMatrixAndLabels(canvas, referenceImage.get(), i,
	drawSubset, drawScaled);
	canvas->translate(kCellSize, 0);
	}
	canvas->restore();
	}

	void makeLabels(GrContext* context) {
	static const char* kLabelText[kNumLabels] = { "LL", "LR", "UL", "UR" };

	static const SkColor kLabelColors[kNumLabels] = {
	SK_ColorRED,
	SK_ColorGREEN,
	SK_ColorBLUE,
	SK_ColorCYAN
	};

	SkASSERT(!fLabels.count());
	for (int i = 0; i < kNumLabels; ++i) {
	fLabels.push_back(make_text_image(context, kLabelText[i], kLabelColors[i]));
	}
	SkASSERT(kNumLabels == fLabels.count());
	}

	void onDraw(GrContext* context, GrRenderTargetContext, SkCanvas canvas) override {
	this->makeLabels(context);

	canvas->save();

	// Top row gets TL image
	this->drawRow(context, canvas, false, false, false);

	canvas->translate(0, kCellSize);

	// Bottom row gets BL image
	this->drawRow(context, canvas, true, false, false);

	canvas->translate(0, kCellSize);

	// Third row gets subsets of BL images
	this->drawRow(context, canvas, true, true, false);

	canvas->translate(0, kCellSize);

	// Fourth row gets scaled subsets of BL images
	this->drawRow(context, canvas, true, true, true);

	canvas->restore();

	// separator grid
	for (int i = 0; i < 4; ++i) {
	canvas->drawLine(0, i * kCellSize, kGMWidth, i * kCellSize, SkPaint());
	}
	for (int i = 0; i < kNumMatrices; ++i) {
	canvas->drawLine(i * kCellSize, 0, i * kCellSize, kGMHeight, SkPaint());
	}
	}

	private:
	SkTArray<sk_sp<SkImage>> fLabels;

	typedef GM INHERITED;
	};

	DEF_GM(return new FlippityGM;)