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

 /*
  * 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 "gm.h"
 #include "SkCanvas.h"
 #include "SkImage.h"
 #include "SkImageGenerator.h"
 #include "SkImage_Base.h"
 #include "SkMakeUnique.h"
 #include "SkPictureRecorder.h"
 #include "SkSurface.h"

 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrContextPriv.h"
 #include "GrSurfaceContext.h"
 #include "GrTextureProxy.h"
 #include "../src/image/SkImage_Gpu.h"
 #endif

 static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setColor(SK_ColorRED);
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(10);
     canvas->drawRect(bounds, paint);
     paint.setStyle(SkPaint::kFill_Style);
     paint.setColor(SK_ColorBLUE);
     canvas->drawOval(bounds, paint);
 }

 /*
  *  Exercise drawing pictures inside an image, showing that the image version is pixelated
  *  (correctly) when it is inside an image.
  */
 class ImagePictGM : public skiagm::GM {
     sk_sp<SkPicture> fPicture;
     sk_sp<SkImage>   fImage0;
     sk_sp<SkImage>   fImage1;
 public:
     ImagePictGM() {}

 protected:
     SkString onShortName() override {
         return SkString("image-picture");
     }

     SkISize onISize() override {
         return SkISize::Make(850, 450);
     }

     void onOnceBeforeDraw() override {
         const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
         SkPictureRecorder recorder;
         draw_something(recorder.beginRecording(bounds), bounds);
         fPicture = recorder.finishRecordingAsPicture();

         // extract enough just for the oval.
         const SkISize size = SkISize::Make(100, 100);
         auto srgbColorSpace = SkColorSpace::MakeSRGB();

         SkMatrix matrix;
         matrix.setTranslate(-100, -100);
         fImage0 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
                                            SkImage::BitDepth::kU8, srgbColorSpace);
         matrix.postTranslate(-50, -50);
         matrix.postRotate(45);
         matrix.postTranslate(50, 50);
         fImage1 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
                                            SkImage::BitDepth::kU8, srgbColorSpace);
     }

     void drawSet(SkCanvas* canvas) const {
         SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
         canvas->drawPicture(fPicture, &matrix, nullptr);
         canvas->drawImage(fImage0.get(), 150, 0);
         canvas->drawImage(fImage1.get(), 300, 0);
     }

     void onDraw(SkCanvas* canvas) override {
         canvas->translate(20, 20);

         this->drawSet(canvas);

         canvas->save();
         canvas->translate(0, 130);
         canvas->scale(0.25f, 0.25f);
         this->drawSet(canvas);
         canvas->restore();

         canvas->save();
         canvas->translate(0, 200);
         canvas->scale(2, 2);
         this->drawSet(canvas);
         canvas->restore();
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ImagePictGM; )

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

 static std::unique_ptr<SkImageGenerator> make_pic_generator(GrContext*, sk_sp<SkPicture> pic) {
     SkMatrix matrix;
     matrix.setTranslate(-100, -100);
     return SkImageGenerator::MakeFromPicture({ 100, 100 }, std::move(pic), &matrix, nullptr,
                                             SkImage::BitDepth::kU8,
                                             SkColorSpace::MakeSRGB());
 }

 class RasterGenerator : public SkImageGenerator {
 public:
     RasterGenerator(const SkBitmap& bm) : SkImageGenerator(bm.info()), fBM(bm)
     {}

 protected:
     bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                      const Options&) override {
         SkASSERT(fBM.width() == info.width());
         SkASSERT(fBM.height() == info.height());
         return fBM.readPixels(info, pixels, rowBytes, 0, 0);
     }
 private:
     SkBitmap fBM;
 };
 static std::unique_ptr<SkImageGenerator> make_ras_generator(GrContext*, sk_sp<SkPicture> pic) {
     SkBitmap bm;
     bm.allocN32Pixels(100, 100);
     SkCanvas canvas(bm);
     canvas.clear(0);
     canvas.translate(-100, -100);
     canvas.drawPicture(pic);
     return skstd::make_unique<RasterGenerator>(bm);
 }

 class EmptyGenerator : public SkImageGenerator {
 public:
     EmptyGenerator(const SkImageInfo& info) : SkImageGenerator(info) {}
 };

 #if SK_SUPPORT_GPU
 class TextureGenerator : public SkImageGenerator {
 public:
     TextureGenerator(GrContext* ctx, const SkImageInfo& info, sk_sp<SkPicture> pic)
         : SkImageGenerator(info)
         , fCtx(SkRef(ctx)) {

         sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0,
                                                              kTopLeft_GrSurfaceOrigin, nullptr));
         if (surface) {
             surface->getCanvas()->clear(0);
             surface->getCanvas()->translate(-100, -100);
             surface->getCanvas()->drawPicture(pic);
             sk_sp<SkImage> image(surface->makeImageSnapshot());
             fProxy = as_IB(image)->asTextureProxyRef();
         }
     }
 protected:
     sk_sp<GrTextureProxy> onGenerateTexture(GrContext* ctx, const SkImageInfo& info,
                                             const SkIPoint& origin,
                                             SkTransferFunctionBehavior) override {
         SkASSERT(ctx);
         SkASSERT(ctx == fCtx.get());

         if (!fProxy) {
             return nullptr;
         }

         if (origin.fX == 0 && origin.fY == 0 &&
             info.width() == fProxy->width() && info.height() == fProxy->height()) {
             return fProxy;
         }

         // need to copy the subset into a new texture
         GrSurfaceDesc desc;
         desc.fOrigin = fProxy->origin();
         desc.fWidth = info.width();
         desc.fHeight = info.height();
         desc.fConfig = fProxy->config();

         sk_sp<GrSurfaceContext> dstContext(fCtx->contextPriv().makeDeferredSurfaceContext(
                                                                             desc,
                                                                             SkBackingFit::kExact,
                                                                             SkBudgeted::kNo));
         if (!dstContext) {
             return nullptr;
         }

         if (!dstContext->copy(
                             fProxy.get(),
                             SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height()),
                             SkIPoint::Make(0, 0))) {
             return nullptr;
         }

         return dstContext->asTextureProxyRef();
     }

 private:
     sk_sp<GrContext>      fCtx;
     sk_sp<GrTextureProxy> fProxy;
 };

 static std::unique_ptr<SkImageGenerator> make_tex_generator(GrContext* ctx, sk_sp<SkPicture> pic) {
     const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);

     if (!ctx) {
         return skstd::make_unique<EmptyGenerator>(info);
     }
     return skstd::make_unique<TextureGenerator>(ctx, info, pic);
 }
 #endif

 class ImageCacheratorGM : public skiagm::GM {
     SkString                         fName;
     std::unique_ptr<SkImageGenerator> (*fFactory)(GrContext*, sk_sp<SkPicture>);
     sk_sp<SkPicture>                 fPicture;
     sk_sp<SkImage>                   fImage;
     sk_sp<SkImage>                   fImageSubset;

 public:
     ImageCacheratorGM(const char suffix[],
                       std::unique_ptr<SkImageGenerator> (*factory)(GrContext*, sk_sp<SkPicture>))
         : fFactory(factory)
     {
         fName.printf("image-cacherator-from-%s", suffix);
     }

 protected:
     SkString onShortName() override {
         return fName;
     }

     SkISize onISize() override {
         return SkISize::Make(960, 450);
     }

     void onOnceBeforeDraw() override {
         const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
         SkPictureRecorder recorder;
         draw_something(recorder.beginRecording(bounds), bounds);
         fPicture = recorder.finishRecordingAsPicture();
     }

     void makeCaches(GrContext* ctx) {
         auto gen = fFactory(ctx, fPicture);
         fImage = SkImage::MakeFromGenerator(std::move(gen));

         const SkIRect subset = SkIRect::MakeLTRB(50, 50, 100, 100);

         gen = fFactory(ctx, fPicture);
         fImageSubset = SkImage::MakeFromGenerator(std::move(gen), &subset);

         SkASSERT(fImage->dimensions() == SkISize::Make(100, 100));
         SkASSERT(fImageSubset->dimensions() == SkISize::Make(50, 50));
     }

     static void draw_as_bitmap(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
         SkBitmap bitmap;
         as_IB(image)->getROPixels(&bitmap, canvas->imageInfo().colorSpace());
         canvas->drawBitmap(bitmap, x, y);
     }

     static void draw_as_tex(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
 #if SK_SUPPORT_GPU
         sk_sp<SkColorSpace> texColorSpace;
         sk_sp<GrTextureProxy> proxy(as_IB(image)->asTextureProxyRef(
                 canvas->getGrContext(), GrSamplerState::ClampBilerp(),
                 canvas->imageInfo().colorSpace(), &texColorSpace, nullptr));
         if (!proxy) {
             // show placeholder if we have no texture
             SkPaint paint;
             paint.setStyle(SkPaint::kStroke_Style);
             SkRect r = SkRect::MakeXYWH(x, y, SkIntToScalar(image->width()),
                                         SkIntToScalar(image->width()));
             canvas->drawRect(r, paint);
             canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), paint);
             canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), paint);
             return;
         }

         // No API to draw a GrTexture directly, so we cheat and create a private image subclass
         sk_sp<SkImage> texImage(new SkImage_Gpu(canvas->getGrContext(), image->uniqueID(),
                                                 kPremul_SkAlphaType, std::move(proxy),
                                                 std::move(texColorSpace), SkBudgeted::kNo));
         canvas->drawImage(texImage.get(), x, y);
 #endif
     }

     void drawSet(SkCanvas* canvas) const {
         SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
         canvas->drawPicture(fPicture, &matrix, nullptr);

         // Draw the tex first, so it doesn't hit a lucky cache from the raster version. This
         // way we also can force the generateTexture call.

         draw_as_tex(canvas, fImage.get(), 310, 0);
         draw_as_tex(canvas, fImageSubset.get(), 310+101, 0);

         draw_as_bitmap(canvas, fImage.get(), 150, 0);
         draw_as_bitmap(canvas, fImageSubset.get(), 150+101, 0);
     }

     void onDraw(SkCanvas* canvas) override {
         this->makeCaches(canvas->getGrContext());

         canvas->translate(20, 20);

         this->drawSet(canvas);

         canvas->save();
         canvas->translate(0, 130);
         canvas->scale(0.25f, 0.25f);
         this->drawSet(canvas);
         canvas->restore();

         canvas->save();
         canvas->translate(0, 200);
         canvas->scale(2, 2);
         this->drawSet(canvas);
         canvas->restore();
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ImageCacheratorGM("picture", make_pic_generator); )
 DEF_GM( return new ImageCacheratorGM("raster", make_ras_generator); )
 #if SK_SUPPORT_GPU
     DEF_GM( return new ImageCacheratorGM("texture", make_tex_generator); )
 #endif
	/*
	* 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 "gm.h"
	#include "SkCanvas.h"
	#include "SkImage.h"
	#include "SkImageGenerator.h"
	#include "SkImage_Base.h"
	#include "SkMakeUnique.h"
	#include "SkPictureRecorder.h"
	#include "SkSurface.h"

	#if SK_SUPPORT_GPU
	#include "GrContext.h"
	#include "GrContextPriv.h"
	#include "GrSurfaceContext.h"
	#include "GrTextureProxy.h"
	#include "../src/image/SkImage_Gpu.h"
	#endif

	static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setColor(SK_ColorRED);
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(10);
	canvas->drawRect(bounds, paint);
	paint.setStyle(SkPaint::kFill_Style);
	paint.setColor(SK_ColorBLUE);
	canvas->drawOval(bounds, paint);
	}

	/*
	* Exercise drawing pictures inside an image, showing that the image version is pixelated
	* (correctly) when it is inside an image.
	*/
	class ImagePictGM : public skiagm::GM {
	sk_sp<SkPicture> fPicture;
	sk_sp<SkImage> fImage0;
	sk_sp<SkImage> fImage1;
	public:
	ImagePictGM() {}

	protected:
	SkString onShortName() override {
	return SkString("image-picture");
	}

	SkISize onISize() override {
	return SkISize::Make(850, 450);
	}

	void onOnceBeforeDraw() override {
	const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
	SkPictureRecorder recorder;
	draw_something(recorder.beginRecording(bounds), bounds);
	fPicture = recorder.finishRecordingAsPicture();

	// extract enough just for the oval.
	const SkISize size = SkISize::Make(100, 100);
	auto srgbColorSpace = SkColorSpace::MakeSRGB();

	SkMatrix matrix;
	matrix.setTranslate(-100, -100);
	fImage0 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
	SkImage::BitDepth::kU8, srgbColorSpace);
	matrix.postTranslate(-50, -50);
	matrix.postRotate(45);
	matrix.postTranslate(50, 50);
	fImage1 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
	SkImage::BitDepth::kU8, srgbColorSpace);
	}

	void drawSet(SkCanvas* canvas) const {
	SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
	canvas->drawPicture(fPicture, &matrix, nullptr);
	canvas->drawImage(fImage0.get(), 150, 0);
	canvas->drawImage(fImage1.get(), 300, 0);
	}

	void onDraw(SkCanvas* canvas) override {
	canvas->translate(20, 20);

	this->drawSet(canvas);

	canvas->save();
	canvas->translate(0, 130);
	canvas->scale(0.25f, 0.25f);
	this->drawSet(canvas);
	canvas->restore();

	canvas->save();
	canvas->translate(0, 200);
	canvas->scale(2, 2);
	this->drawSet(canvas);
	canvas->restore();
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new ImagePictGM; )

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

	static std::unique_ptr<SkImageGenerator> make_pic_generator(GrContext*, sk_sp<SkPicture> pic) {
	SkMatrix matrix;
	matrix.setTranslate(-100, -100);
	return SkImageGenerator::MakeFromPicture({ 100, 100 }, std::move(pic), &matrix, nullptr,
	SkImage::BitDepth::kU8,
	SkColorSpace::MakeSRGB());
	}

	class RasterGenerator : public SkImageGenerator {
	public:
	RasterGenerator(const SkBitmap& bm) : SkImageGenerator(bm.info()), fBM(bm)
	{}

	protected:
	bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
	const Options&) override {
	SkASSERT(fBM.width() == info.width());
	SkASSERT(fBM.height() == info.height());
	return fBM.readPixels(info, pixels, rowBytes, 0, 0);
	}
	private:
	SkBitmap fBM;
	};
	static std::unique_ptr<SkImageGenerator> make_ras_generator(GrContext*, sk_sp<SkPicture> pic) {
	SkBitmap bm;
	bm.allocN32Pixels(100, 100);
	SkCanvas canvas(bm);
	canvas.clear(0);
	canvas.translate(-100, -100);
	canvas.drawPicture(pic);
	return skstd::make_unique<RasterGenerator>(bm);
	}

	class EmptyGenerator : public SkImageGenerator {
	public:
	EmptyGenerator(const SkImageInfo& info) : SkImageGenerator(info) {}
	};

	#if SK_SUPPORT_GPU
	class TextureGenerator : public SkImageGenerator {
	public:
	TextureGenerator(GrContext* ctx, const SkImageInfo& info, sk_sp<SkPicture> pic)
	: SkImageGenerator(info)
	, fCtx(SkRef(ctx)) {

	sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0,
	kTopLeft_GrSurfaceOrigin, nullptr));
	if (surface) {
	surface->getCanvas()->clear(0);
	surface->getCanvas()->translate(-100, -100);
	surface->getCanvas()->drawPicture(pic);
	sk_sp<SkImage> image(surface->makeImageSnapshot());
	fProxy = as_IB(image)->asTextureProxyRef();
	}
	}
	protected:
	sk_sp<GrTextureProxy> onGenerateTexture(GrContext* ctx, const SkImageInfo& info,
	const SkIPoint& origin,
	SkTransferFunctionBehavior) override {
	SkASSERT(ctx);
	SkASSERT(ctx == fCtx.get());

	if (!fProxy) {
	return nullptr;
	}

	if (origin.fX == 0 && origin.fY == 0 &&
	info.width() == fProxy->width() && info.height() == fProxy->height()) {
	return fProxy;
	}

	// need to copy the subset into a new texture
	GrSurfaceDesc desc;
	desc.fOrigin = fProxy->origin();
	desc.fWidth = info.width();
	desc.fHeight = info.height();
	desc.fConfig = fProxy->config();

	sk_sp<GrSurfaceContext> dstContext(fCtx->contextPriv().makeDeferredSurfaceContext(
	desc,
	SkBackingFit::kExact,
	SkBudgeted::kNo));
	if (!dstContext) {
	return nullptr;
	}

	if (!dstContext->copy(
	fProxy.get(),
	SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height()),
	SkIPoint::Make(0, 0))) {
	return nullptr;
	}

	return dstContext->asTextureProxyRef();
	}

	private:
	sk_sp<GrContext> fCtx;
	sk_sp<GrTextureProxy> fProxy;
	};

	static std::unique_ptr<SkImageGenerator> make_tex_generator(GrContext* ctx, sk_sp<SkPicture> pic) {
	const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);

	if (!ctx) {
	return skstd::make_unique<EmptyGenerator>(info);
	}
	return skstd::make_unique<TextureGenerator>(ctx, info, pic);
	}
	#endif

	class ImageCacheratorGM : public skiagm::GM {
	SkString fName;
	std::unique_ptr<SkImageGenerator> (fFactory)(GrContext, sk_sp<SkPicture>);
	sk_sp<SkPicture> fPicture;
	sk_sp<SkImage> fImage;
	sk_sp<SkImage> fImageSubset;

	public:
	ImageCacheratorGM(const char suffix[],
	std::unique_ptr<SkImageGenerator> (factory)(GrContext, sk_sp<SkPicture>))
	: fFactory(factory)
	{
	fName.printf("image-cacherator-from-%s", suffix);
	}

	protected:
	SkString onShortName() override {
	return fName;
	}

	SkISize onISize() override {
	return SkISize::Make(960, 450);
	}

	void onOnceBeforeDraw() override {
	const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
	SkPictureRecorder recorder;
	draw_something(recorder.beginRecording(bounds), bounds);
	fPicture = recorder.finishRecordingAsPicture();
	}

	void makeCaches(GrContext* ctx) {
	auto gen = fFactory(ctx, fPicture);
	fImage = SkImage::MakeFromGenerator(std::move(gen));

	const SkIRect subset = SkIRect::MakeLTRB(50, 50, 100, 100);

	gen = fFactory(ctx, fPicture);
	fImageSubset = SkImage::MakeFromGenerator(std::move(gen), &subset);

	SkASSERT(fImage->dimensions() == SkISize::Make(100, 100));
	SkASSERT(fImageSubset->dimensions() == SkISize::Make(50, 50));
	}

	static void draw_as_bitmap(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
	SkBitmap bitmap;
	as_IB(image)->getROPixels(&bitmap, canvas->imageInfo().colorSpace());
	canvas->drawBitmap(bitmap, x, y);
	}

	static void draw_as_tex(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
	#if SK_SUPPORT_GPU
	sk_sp<SkColorSpace> texColorSpace;
	sk_sp<GrTextureProxy> proxy(as_IB(image)->asTextureProxyRef(
	canvas->getGrContext(), GrSamplerState::ClampBilerp(),
	canvas->imageInfo().colorSpace(), &texColorSpace, nullptr));
	if (!proxy) {
	// show placeholder if we have no texture
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	SkRect r = SkRect::MakeXYWH(x, y, SkIntToScalar(image->width()),
	SkIntToScalar(image->width()));
	canvas->drawRect(r, paint);
	canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), paint);
	canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), paint);
	return;
	}

	// No API to draw a GrTexture directly, so we cheat and create a private image subclass
	sk_sp<SkImage> texImage(new SkImage_Gpu(canvas->getGrContext(), image->uniqueID(),
	kPremul_SkAlphaType, std::move(proxy),
	std::move(texColorSpace), SkBudgeted::kNo));
	canvas->drawImage(texImage.get(), x, y);
	#endif
	}

	void drawSet(SkCanvas* canvas) const {
	SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
	canvas->drawPicture(fPicture, &matrix, nullptr);

	// Draw the tex first, so it doesn't hit a lucky cache from the raster version. This
	// way we also can force the generateTexture call.

	draw_as_tex(canvas, fImage.get(), 310, 0);
	draw_as_tex(canvas, fImageSubset.get(), 310+101, 0);

	draw_as_bitmap(canvas, fImage.get(), 150, 0);
	draw_as_bitmap(canvas, fImageSubset.get(), 150+101, 0);
	}

	void onDraw(SkCanvas* canvas) override {
	this->makeCaches(canvas->getGrContext());

	canvas->translate(20, 20);

	this->drawSet(canvas);

	canvas->save();
	canvas->translate(0, 130);
	canvas->scale(0.25f, 0.25f);
	this->drawSet(canvas);
	canvas->restore();

	canvas->save();
	canvas->translate(0, 200);
	canvas->scale(2, 2);
	this->drawSet(canvas);
	canvas->restore();
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new ImageCacheratorGM("picture", make_pic_generator); )
	DEF_GM( return new ImageCacheratorGM("raster", make_ras_generator); )
	#if SK_SUPPORT_GPU
	DEF_GM( return new ImageCacheratorGM("texture", make_tex_generator); )
	#endif