/* * Copyright 2011 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/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkFont.h" #include "include/core/SkFontTypes.h" #include "include/core/SkImage.h" #include "include/core/SkImageFilter.h" #include "include/core/SkPaint.h" #include "include/core/SkPoint.h" #include "include/core/SkRect.h" #include "include/core/SkRefCnt.h" #include "include/core/SkScalar.h" #include "include/core/SkShader.h" #include "include/core/SkSize.h" #include "include/core/SkString.h" #include "include/core/SkSurface.h" #include "include/core/SkTileMode.h" #include "include/core/SkTypeface.h" #include "include/core/SkTypes.h" #include "include/effects/SkGradientShader.h" #include "include/effects/SkImageFilters.h" #include "tools/ToolUtils.h" #include static sk_sp make_src(int w, int h) { sk_sp surface(SkSurface::MakeRasterN32Premul(w, h)); SkCanvas* canvas = surface->getCanvas(); SkPaint paint; SkPoint pts[] = { {0, 0}, {SkIntToScalar(w), SkIntToScalar(h)} }; SkColor colors[] = { SK_ColorTRANSPARENT, SK_ColorGREEN, SK_ColorCYAN, SK_ColorRED, SK_ColorMAGENTA, SK_ColorWHITE, }; paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kClamp)); canvas->drawPaint(paint); return surface->makeImageSnapshot(); } static sk_sp make_dst(int w, int h) { sk_sp surface(SkSurface::MakeRasterN32Premul(w, h)); SkCanvas* canvas = surface->getCanvas(); SkPaint paint; SkPoint pts[] = { {0, SkIntToScalar(h)}, {SkIntToScalar(w), 0} }; SkColor colors[] = { SK_ColorBLUE, SK_ColorYELLOW, SK_ColorBLACK, SK_ColorGREEN, SK_ColorGRAY, }; paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kClamp)); canvas->drawPaint(paint); return surface->makeImageSnapshot(); } static void show_k_text(SkCanvas* canvas, SkScalar x, SkScalar y, const SkScalar k[]) { SkFont font(ToolUtils::create_portable_typeface(), 24); font.setEdging(SkFont::Edging::kAntiAlias); SkPaint paint; paint.setAntiAlias(true); for (int i = 0; i < 4; ++i) { SkString str; str.appendScalar(k[i]); SkScalar width = font.measureText(str.c_str(), str.size(), SkTextEncoding::kUTF8); canvas->drawString(str, x, y + font.getSize(), font, paint); x += width + SkIntToScalar(10); } } class ArithmodeGM : public skiagm::GM { SkString onShortName() override { return SkString("arithmode"); } SkISize onISize() override { return {640, 572}; } void onDraw(SkCanvas* canvas) override { constexpr int WW = 100, HH = 32; sk_sp src = make_src(WW, HH); sk_sp dst = make_dst(WW, HH); sk_sp srcFilter = SkImageFilters::Image(src); sk_sp dstFilter = SkImageFilters::Image(dst); constexpr SkScalar one = SK_Scalar1; constexpr SkScalar K[] = { 0, 0, 0, 0, 0, 0, 0, one, 0, one, 0, 0, 0, 0, one, 0, 0, one, one, 0, 0, one, -one, 0, 0, one/2, one/2, 0, 0, one/2, one/2, one/4, 0, one/2, one/2, -one/4, one/4, one/2, one/2, 0, -one/4, one/2, one/2, 0, }; const SkScalar* k = K; const SkScalar* stop = k + SK_ARRAY_COUNT(K); const SkRect rect = SkRect::MakeWH(WW, HH); SkScalar gap = SkIntToScalar(WW + 20); while (k < stop) { { SkAutoCanvasRestore acr(canvas, true); canvas->drawImage(src, 0, 0); canvas->translate(gap, 0); canvas->drawImage(dst, 0, 0); canvas->translate(gap, 0); SkPaint paint; paint.setImageFilter(SkImageFilters::Arithmetic(k[0], k[1], k[2], k[3], true, dstFilter, srcFilter, nullptr)); canvas->saveLayer(&rect, &paint); canvas->restore(); canvas->translate(gap, 0); show_k_text(canvas, 0, 0, k); } k += 4; canvas->translate(0, HH + 12); } // Draw two special cases to test enforcePMColor. In these cases, we // draw the dst bitmap twice, the first time it is halved and inverted, // leading to invalid premultiplied colors. If we enforcePMColor, these // invalid values should be clamped, and will not contribute to the // second draw. for (int i = 0; i < 2; i++) { const bool enforcePMColor = (i == 0); { SkAutoCanvasRestore acr(canvas, true); canvas->translate(gap, 0); canvas->drawImage(dst, 0, 0); canvas->translate(gap, 0); sk_sp bg = SkImageFilters::Arithmetic(0, 0, -one / 2, 1, enforcePMColor, dstFilter, nullptr, nullptr); SkPaint p; p.setImageFilter(SkImageFilters::Arithmetic(0, one / 2, -one, 1, true, std::move(bg), dstFilter, nullptr)); canvas->saveLayer(&rect, &p); canvas->restore(); canvas->translate(gap, 0); // Label SkFont font(ToolUtils::create_portable_typeface(), 24); SkString str(enforcePMColor ? "enforcePM" : "no enforcePM"); canvas->drawString(str, 0, font.getSize(), font, SkPaint()); } canvas->translate(0, HH + 12); } } private: using INHERITED = GM; }; DEF_GM( return new ArithmodeGM; ) /////////////////////////////////////////////////////////////////////////////// #include "include/effects/SkBlenders.h" class Arithmode2GM : public skiagm::GM { float fK1, fK2, fK3, fK4; sk_sp fSrc, fDst, fChecker; SkString onShortName() override { return SkString("arithmode_blender"); } SkISize onISize() override { return {430, 430}; } enum { W = 200, H = 200, }; void onOnceBeforeDraw() override { // need something interesting, in case we're drawn w/o calling animate() fK1 = -0.25f; fK2 = 0.25f; fK3 = 0.25f; fK4 = 0; fSrc = make_src(W, H); fDst = make_dst(W, H); fChecker = ToolUtils::create_checkerboard_image(W, H, 0xFFBBBBBB, 0xFFEEEEEE, 8); } bool onAnimate(double nanos) override { double theta = nanos * 1e-6 * 0.001; fK1 = sin(theta + 0) * 0.25; fK2 = cos(theta + 1) * 0.25; fK3 = sin(theta + 2) * 0.25; fK4 = 0.5; return true; } void onDraw(SkCanvas* canvas) override { const SkRect rect = SkRect::MakeWH(W, H); canvas->drawImage(fSrc, 10, 10); canvas->drawImage(fDst, 10, 10 + fSrc->height() + 10); auto sampling = SkSamplingOptions(); auto blender = SkBlenders::Arithmetic(fK1, fK2, fK3, fK4, true); SkPaint paint; canvas->translate(10 + fSrc->width() + 10, 10); canvas->drawImage(fChecker, 0, 0); // Draw via blend step canvas->saveLayer(&rect, nullptr); canvas->drawImage(fDst, 0, 0); paint.setBlender(blender); canvas->drawImage(fSrc, 0, 0, sampling, &paint); canvas->restore(); canvas->translate(0, 10 + fSrc->height()); canvas->drawImage(fChecker, 0, 0); // Draw via imagefilter (should appear the same as above) paint.setBlender(nullptr); paint.setImageFilter(SkImageFilters::Blend(blender, /* dst imagefilter */nullptr, SkImageFilters::Image(fSrc, sampling))); canvas->drawImage(fDst, 0, 0, sampling, &paint); } private: using INHERITED = GM; }; DEF_GM( return new Arithmode2GM; )