| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "tools/Resources.h" |
| #include "tools/ToolUtils.h" |
| |
| static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) { |
| static constexpr SkScalar kSize = 50; |
| SkImageInfo info = SkImageInfo::MakeN32Premul(kSize, kSize); |
| auto surface(SkSurface::MakeRaster(info)); |
| |
| SkPaint p; |
| p.setAntiAlias(true); |
| p.setColor(SK_ColorGREEN); |
| |
| surface->getCanvas()->drawCircle(kSize / 2, kSize / 2, kSize / 2, p); |
| |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setColor(SK_ColorRED); |
| surface->getCanvas()->drawLine(kSize * .25f, kSize * .50f, kSize * .75f, kSize * .50f, p); |
| surface->getCanvas()->drawLine(kSize * .50f, kSize * .25f, kSize * .50f, kSize * .75f, p); |
| |
| sk_sp<SkImage> img = surface->makeImageSnapshot(); |
| return ToolUtils::MakeTextureImage(rootCanvas, std::move(img)); |
| } |
| |
| DEF_SIMPLE_GM(localmatrixshader_nested, canvas, 450, 1200) { |
| auto image = make_image(canvas); |
| if (!image) { |
| return; |
| } |
| |
| using FactoryT = sk_sp<SkShader> (*)(const sk_sp<SkImage>&, |
| const SkMatrix& inner, |
| const SkMatrix& outer); |
| static const FactoryT gFactories[] = { |
| // SkLocalMatrixShader(SkImageShader(inner), outer) |
| [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
| return img->makeShader(SkSamplingOptions(), inner)->makeWithLocalMatrix(outer); |
| }, |
| |
| // SkLocalMatrixShader(SkLocalMatrixShader(SkImageShader(I), inner), outer) |
| [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
| return img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner)->makeWithLocalMatrix(outer); |
| }, |
| |
| // SkLocalMatrixShader(SkComposeShader(SkImageShader(inner)), outer) |
| [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
| return SkShaders::Blend(SkBlendMode::kSrcOver, |
| SkShaders::Color(SK_ColorTRANSPARENT), |
| img->makeShader(SkSamplingOptions(), inner)) |
| ->makeWithLocalMatrix(outer); |
| }, |
| |
| // SkLocalMatrixShader(SkComposeShader(SkLocalMatrixShader(SkImageShader(I), inner)), outer) |
| [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
| return SkShaders::Blend(SkBlendMode::kSrcOver, |
| SkShaders::Color(SK_ColorTRANSPARENT), |
| img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner)) |
| ->makeWithLocalMatrix(outer); |
| }, |
| }; |
| |
| static const auto inner = SkMatrix::Scale(2, 2), |
| outer = SkMatrix::Translate(20, 20); |
| |
| SkPaint border; |
| border.setAntiAlias(true); |
| border.setStyle(SkPaint::kStroke_Style); |
| |
| auto rect = SkRect::Make(image->bounds()); |
| SkAssertResult(SkMatrix::Concat(inner, outer).mapRect(&rect)); |
| |
| const auto drawColumn = [&]() { |
| SkAutoCanvasRestore acr(canvas, true); |
| for (const auto& f : gFactories) { |
| SkPaint p; |
| p.setShader(f(image, inner, outer)); |
| |
| canvas->drawRect(rect, p); |
| canvas->drawRect(rect, border); |
| |
| canvas->translate(0, rect.height() * 1.5f); |
| } |
| }; |
| |
| drawColumn(); |
| |
| { |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->translate(0, rect.height() * std::size(gFactories) * 1.5f); |
| drawColumn(); |
| } |
| |
| canvas->translate(rect.width() * 1.5f, 0); |
| canvas->scale(2, 2); |
| drawColumn(); |
| } |
| |
| DEF_SIMPLE_GM(localmatrixshader_persp, canvas, 542, 266) { |
| auto image = GetResourceAsImage("images/yellow_rose.png"); |
| |
| SkBitmap downsized; |
| downsized.allocPixels(image->imageInfo().makeWH(128, 128)); |
| image->scalePixels(downsized.pixmap(), SkSamplingOptions(SkFilterMode::kLinear)); |
| image = downsized.asImage(); |
| SkRect imgRect = SkRect::MakeIWH(image->width(), image->height()); |
| |
| // scale matrix |
| SkMatrix scale = SkMatrix::Scale(1.f / 5.f, 1.f / 5.f); |
| |
| // perspective matrix |
| SkPoint src[4]; |
| imgRect.toQuad(src); |
| SkPoint dst[4] = {{0, 10.f}, |
| {image->width() + 28.f, -100.f}, |
| {image->width() - 28.f, image->height() + 100.f}, |
| {0.f, image->height() - 10.f}}; |
| SkMatrix persp; |
| SkAssertResult(persp.setPolyToPoly(src, dst, 4)); |
| |
| // combined persp * scale |
| SkMatrix perspScale = SkMatrix::Concat(persp, scale); |
| |
| auto draw = [&](sk_sp<SkShader> shader, bool applyPerspToCTM) { |
| canvas->save(); |
| canvas->clipRect(imgRect); |
| if (applyPerspToCTM) { |
| canvas->concat(persp); |
| } |
| SkPaint imgShaderPaint; |
| imgShaderPaint.setShader(std::move(shader)); |
| canvas->drawPaint(imgShaderPaint); |
| canvas->restore(); |
| |
| canvas->translate(10.f + image->width(), 0.f); // advance |
| }; |
| |
| // SkImageShader |
| canvas->save(); |
| // 4 variants that all attempt to apply sample at persp * scale w/ an image shader |
| // 1. scale provided to SkImage::makeShader(...) but drawn with persp |
| auto s1 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| SkSamplingOptions(), &scale); |
| draw(s1, true); |
| |
| // 2. persp provided to SkImage::makeShader, then wrapped in scale makeWithLocalMatrix |
| // These pre-concat, so it ends up as persp * scale. |
| auto s2 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| SkSamplingOptions(), &persp) |
| ->makeWithLocalMatrix(scale); |
| draw(s2, false); |
| |
| // 3. Providing pre-computed persp*scale to SkImage::makeShader() |
| auto s3 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| SkSamplingOptions(), &perspScale); |
| draw(s3, false); |
| |
| // 4. Providing pre-computed persp*scale to makeWithLocalMatrix |
| auto s4 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions()) |
| ->makeWithLocalMatrix(perspScale); |
| draw(s4, false); |
| canvas->restore(); |
| |
| canvas->translate(0.f, 10.f + image->height()); // advance to next row |
| |
| // SkGradientShader |
| const SkColor kGradColors[] = { SK_ColorBLACK, SK_ColorTRANSPARENT }; |
| canvas->save(); |
| // 1. scale provided to Make, drawn with persp |
| auto g1 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| SkTileMode::kRepeat, 0, &scale); |
| draw(g1, true); |
| |
| // 2. persp provided to Make, then wrapped with makeWithLocalMatrix (pre-concat as before). |
| auto g2 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| SkTileMode::kRepeat, 0, &persp) |
| ->makeWithLocalMatrix(scale); |
| draw(g2, false); |
| |
| // 3. Provide per-computed persp*scale to Make |
| auto g3 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| SkTileMode::kRepeat, 0, &perspScale); |
| draw(g3, false); |
| |
| // 4. Providing pre-computed persp*scale to makeWithLocalMatrix |
| auto g4 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| SkTileMode::kRepeat) |
| ->makeWithLocalMatrix(perspScale); |
| draw(g4, false); |
| canvas->restore(); |
| } |