/* * 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/gm.h" #include "include/core/SkBlendMode.h" #include "include/core/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkFont.h" #include "include/core/SkImageInfo.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 "tools/ToolUtils.h" namespace skiagm { constexpr int kColWidth = 180; constexpr int kNumCols = 4; constexpr int kWidth = kColWidth * kNumCols; constexpr int kHeight = 750; static sk_sp<SkShader> make_shader(const SkRect& bounds) { const SkPoint pts[] = { { bounds.left(), bounds.top() }, { bounds.right(), bounds.bottom() }, }; const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, }; return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kRepeat); } class LcdBlendGM : public skiagm::GM { public: LcdBlendGM() { const int kPointSize = 25; fTextHeight = SkIntToScalar(kPointSize); } protected: SkString onShortName() override { return SkString("lcdblendmodes"); } void onOnceBeforeDraw() override { fCheckerboard = ToolUtils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 4); } SkISize onISize() override { return SkISize::Make(kWidth, kHeight); } void onDraw(SkCanvas* canvas) override { SkPaint p; p.setAntiAlias(false); p.setStyle(SkPaint::kFill_Style); p.setShader(fCheckerboard); SkRect r = SkRect::MakeWH(SkIntToScalar(kWidth), SkIntToScalar(kHeight)); canvas->drawRect(r, p); SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight); auto surface(ToolUtils::makeSurface(canvas, info)); SkCanvas* surfCanvas = surface->getCanvas(); this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false); surfCanvas->translate(SkIntToScalar(kColWidth), 0); this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false); surfCanvas->translate(SkIntToScalar(kColWidth), 0); this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false); surfCanvas->translate(SkIntToScalar(kColWidth), 0); this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true); SkPaint surfPaint; surfPaint.setBlendMode(SkBlendMode::kSrcOver); surface->draw(canvas, 0, 0, &surfPaint); } void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) { const SkBlendMode gModes[] = { SkBlendMode::kClear, SkBlendMode::kSrc, SkBlendMode::kDst, SkBlendMode::kSrcOver, SkBlendMode::kDstOver, SkBlendMode::kSrcIn, SkBlendMode::kDstIn, SkBlendMode::kSrcOut, SkBlendMode::kDstOut, SkBlendMode::kSrcATop, SkBlendMode::kDstATop, SkBlendMode::kXor, SkBlendMode::kPlus, SkBlendMode::kModulate, SkBlendMode::kScreen, SkBlendMode::kOverlay, SkBlendMode::kDarken, SkBlendMode::kLighten, SkBlendMode::kColorDodge, SkBlendMode::kColorBurn, SkBlendMode::kHardLight, SkBlendMode::kSoftLight, SkBlendMode::kDifference, SkBlendMode::kExclusion, SkBlendMode::kMultiply, SkBlendMode::kHue, SkBlendMode::kSaturation, SkBlendMode::kColor, SkBlendMode::kLuminosity, }; // Draw background rect SkPaint backgroundPaint; backgroundPaint.setColor(backgroundColor); canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint); SkScalar y = fTextHeight; for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) { SkPaint paint; paint.setColor(textColor); paint.setBlendMode(gModes[m]); SkFont font(ToolUtils::create_portable_typeface(), fTextHeight); font.setSubpixel(true); font.setEdging(SkFont::Edging::kSubpixelAntiAlias); if (useGrad) { SkRect r; r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight); paint.setShader(make_shader(r)); } SkString string(SkBlendMode_Name(gModes[m])); canvas->drawString(string, 0, y, font, paint); y+=fTextHeight; } } private: SkScalar fTextHeight; sk_sp<SkShader> fCheckerboard; typedef skiagm::GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM( return new LcdBlendGM; ) }