280 lines
10 KiB
C++
280 lines
10 KiB
C++
/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkBlendMode.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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#include "tools/Resources.h"
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#include "tools/ToolUtils.h"
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#include "tools/timer/TimeUtils.h"
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static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) {
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static constexpr SkScalar kSize = 50;
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SkImageInfo info = SkImageInfo::MakeN32Premul(kSize, kSize);
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auto surface(SkSurface::MakeRaster(info));
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SkPaint p;
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p.setAntiAlias(true);
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p.setColor(SK_ColorGREEN);
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surface->getCanvas()->drawCircle(kSize / 2, kSize / 2, kSize / 2, p);
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p.setStyle(SkPaint::kStroke_Style);
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p.setColor(SK_ColorRED);
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surface->getCanvas()->drawLine(kSize * .25f, kSize * .50f, kSize * .75f, kSize * .50f, p);
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surface->getCanvas()->drawLine(kSize * .50f, kSize * .25f, kSize * .50f, kSize * .75f, p);
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sk_sp<SkImage> img = surface->makeImageSnapshot();
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return ToolUtils::MakeTextureImage(rootCanvas, std::move(img));
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}
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DEF_SIMPLE_GM(localmatrixshader_nested, canvas, 450, 1200) {
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auto image = make_image(canvas);
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if (!image) {
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return;
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}
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using FactoryT = sk_sp<SkShader> (*)(const sk_sp<SkImage>&,
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const SkMatrix& inner,
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const SkMatrix& outer);
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static const FactoryT gFactories[] = {
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// SkLocalMatrixShader(SkImageShader(inner), outer)
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[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
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return img->makeShader(SkSamplingOptions(), inner)->makeWithLocalMatrix(outer);
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},
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// SkLocalMatrixShader(SkLocalMatrixShader(SkImageShader(I), inner), outer)
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[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
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return img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner)->makeWithLocalMatrix(outer);
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},
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// SkLocalMatrixShader(SkComposeShader(SkImageShader(inner)), outer)
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[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
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return SkShaders::Blend(SkBlendMode::kSrcOver,
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SkShaders::Color(SK_ColorTRANSPARENT),
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img->makeShader(SkSamplingOptions(), inner))
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->makeWithLocalMatrix(outer);
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},
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// SkLocalMatrixShader(SkComposeShader(SkLocalMatrixShader(SkImageShader(I), inner)), outer)
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[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
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return SkShaders::Blend(SkBlendMode::kSrcOver,
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SkShaders::Color(SK_ColorTRANSPARENT),
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img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner))
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->makeWithLocalMatrix(outer);
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},
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};
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static const auto outer = SkMatrix::Scale(2, 2),
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inner = SkMatrix::Translate(20, 20);
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SkPaint border;
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border.setAntiAlias(true);
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border.setStyle(SkPaint::kStroke_Style);
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auto rect = SkRect::Make(image->bounds());
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SkAssertResult(SkMatrix::Concat(outer, inner).mapRect(&rect));
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const auto drawColumn = [&]() {
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SkAutoCanvasRestore acr(canvas, true);
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for (const auto& f : gFactories) {
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SkPaint p;
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p.setShader(f(image, inner, outer));
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canvas->drawRect(rect, p);
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canvas->drawRect(rect, border);
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canvas->translate(0, rect.height() * 1.5f);
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}
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};
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drawColumn();
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{
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SkAutoCanvasRestore acr(canvas, true);
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canvas->translate(0, rect.height() * std::size(gFactories) * 1.5f);
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drawColumn();
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}
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canvas->translate(rect.width() * 1.5f, 0);
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canvas->scale(2, 2);
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drawColumn();
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}
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DEF_SIMPLE_GM(localmatrixshader_persp, canvas, 542, 266) {
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auto image = GetResourceAsImage("images/yellow_rose.png");
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SkBitmap downsized;
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downsized.allocPixels(image->imageInfo().makeWH(128, 128));
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image->scalePixels(downsized.pixmap(), SkSamplingOptions(SkFilterMode::kLinear));
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image = downsized.asImage();
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SkRect imgRect = SkRect::MakeIWH(image->width(), image->height());
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// scale matrix
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SkMatrix scale = SkMatrix::Scale(1.f / 5.f, 1.f / 5.f);
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// perspective matrix
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SkPoint src[4];
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imgRect.toQuad(src);
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SkPoint dst[4] = {{0, 10.f},
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{image->width() + 28.f, -100.f},
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{image->width() - 28.f, image->height() + 100.f},
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{0.f, image->height() - 10.f}};
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SkMatrix persp;
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SkAssertResult(persp.setPolyToPoly(src, dst, 4));
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// combined persp * scale
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SkMatrix perspScale = SkMatrix::Concat(persp, scale);
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auto draw = [&](sk_sp<SkShader> shader, bool applyPerspToCTM) {
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canvas->save();
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canvas->clipRect(imgRect);
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if (applyPerspToCTM) {
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canvas->concat(persp);
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}
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SkPaint imgShaderPaint;
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imgShaderPaint.setShader(std::move(shader));
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canvas->drawPaint(imgShaderPaint);
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canvas->restore();
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canvas->translate(10.f + image->width(), 0.f); // advance
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};
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// SkImageShader
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canvas->save();
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// 4 variants that all attempt to apply sample at persp * scale w/ an image shader
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// 1. scale provided to SkImage::makeShader(...) but drawn with persp
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auto s1 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
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SkSamplingOptions(), &scale);
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draw(s1, true);
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// 2. scale provided to SkImage::makeShader, then wrapped in persp makeWithLocalMatrix
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// These post-concat, so it ends up as persp * scale.
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auto s2 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
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SkSamplingOptions(), &scale)
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->makeWithLocalMatrix(persp);
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draw(s2, false);
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// 3. Providing pre-computed persp*scale to SkImage::makeShader()
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auto s3 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
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SkSamplingOptions(), &perspScale);
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draw(s3, false);
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// 4. Providing pre-computed persp*scale to makeWithLocalMatrix
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auto s4 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions())
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->makeWithLocalMatrix(perspScale);
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draw(s4, false);
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canvas->restore();
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canvas->translate(0.f, 10.f + image->height()); // advance to next row
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// SkGradientShader
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const SkColor kGradColors[] = { SK_ColorBLACK, SK_ColorTRANSPARENT };
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canvas->save();
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// 1. scale provided to Make, drawn with persp
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auto g1 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()},
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imgRect.width() / 2.f, kGradColors, nullptr, 2,
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SkTileMode::kRepeat, 0, &scale);
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draw(g1, true);
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// 2. scale provided to Make, then wrapped with makeWithLocalMatrix (post-concat as before).
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auto g2 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()},
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imgRect.width() / 2.f, kGradColors, nullptr, 2,
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SkTileMode::kRepeat, 0, &scale)
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->makeWithLocalMatrix(persp);
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draw(g2, false);
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// 3. Provide per-computed persp*scale to Make
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auto g3 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()},
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imgRect.width() / 2.f, kGradColors, nullptr, 2,
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SkTileMode::kRepeat, 0, &perspScale);
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draw(g3, false);
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// 4. Providing pre-computed persp*scale to makeWithLocalMatrix
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auto g4 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()},
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imgRect.width() / 2.f, kGradColors, nullptr, 2,
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SkTileMode::kRepeat)
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->makeWithLocalMatrix(perspScale);
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draw(g4, false);
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canvas->restore();
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}
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namespace skiagm {
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class LocalMatrixOrder : public GM {
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public:
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LocalMatrixOrder() {}
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protected:
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SkString onShortName() override {
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return SkString("localmatrix_order");
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}
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SkISize onISize() override { return SkISize::Make(500, 500); }
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void onOnceBeforeDraw() override {
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auto mandrill = GetResourceAsImage("images/mandrill_256.png"); // 256x256
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auto example5 = GetResourceAsImage("images/example_5.png"); // 128x128
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auto mshader = mandrill->makeShader(
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SkTileMode::kRepeat,
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SkTileMode::kRepeat,
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SkSamplingOptions{},
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SkMatrix::RotateDeg(45, {128, 128})); // rotate about center
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auto eshader = example5->makeShader(
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SkTileMode::kRepeat,
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SkTileMode::kRepeat,
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SkSamplingOptions{},
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SkMatrix::Scale(2, 2)); // make same size as mandrill and...
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// ... rotate about center
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eshader = eshader->makeWithLocalMatrix(SkMatrix::RotateDeg(45, {128, 128}));
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// blend the two rotated and aligned images.
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fShader = SkShaders::Blend(SkBlendMode::kModulate, mshader, eshader);
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}
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void onDraw(SkCanvas* canvas) override {
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// Rotate fShader about the canvas center
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auto center = SkRect::Make(canvas->imageInfo().bounds()).center();
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// viewer can insert a dpi scaling matrix. Make the animation always rotate about the device
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// center.
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if (auto ictm = canvas->getTotalMatrix(); ictm.invert(&ictm)) {
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center = ictm.mapPoint(center);
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}
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auto shader = fShader->makeWithLocalMatrix(SkMatrix::RotateDeg(fAngle, center));
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SkPaint paint;
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paint.setShader(shader);
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canvas->drawPaint(paint);
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}
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bool onAnimate(double nanos) override {
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fAngle = TimeUtils::NanosToSeconds(nanos) * 5.f;
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return true;
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}
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sk_sp<SkShader> fShader;
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float fAngle = 0.f;
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};
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DEF_GM(return new LocalMatrixOrder;)
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} // namespace skiagm
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