/* * Copyright 2015 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ /* * Tests text rendering with LCD and the various blend modes. */ #include "gm.h" #include "SkCanvas.h" #include "SkGradientShader.h" #include "SkSurface.h" namespace skiagm { constexpr int kColWidth = 180; constexpr int kNumCols = 4; constexpr int kWidth = kColWidth * kNumCols; constexpr int kHeight = 750; static sk_sp 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), SkShader::kRepeat_TileMode); } 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 = sk_tool_utils::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(canvas->makeSurface(info)); if (nullptr == surface) { surface = SkSurface::MakeRaster(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 struct { SkBlendMode fMode; const char* fLabel; } gModes[] = { { SkBlendMode::kClear, "Clear" }, { SkBlendMode::kSrc, "Src" }, { SkBlendMode::kDst, "Dst" }, { SkBlendMode::kSrcOver, "SrcOver" }, { SkBlendMode::kDstOver, "DstOver" }, { SkBlendMode::kSrcIn, "SrcIn" }, { SkBlendMode::kDstIn, "DstIn" }, { SkBlendMode::kSrcOut, "SrcOut" }, { SkBlendMode::kDstOut, "DstOut" }, { SkBlendMode::kSrcATop, "SrcATop" }, { SkBlendMode::kDstATop, "DstATop" }, { SkBlendMode::kXor, "Xor" }, { SkBlendMode::kPlus, "Plus" }, { SkBlendMode::kModulate, "Modulate" }, { SkBlendMode::kScreen, "Screen" }, { SkBlendMode::kOverlay, "Overlay" }, { SkBlendMode::kDarken, "Darken" }, { SkBlendMode::kLighten, "Lighten" }, { SkBlendMode::kColorDodge, "ColorDodge" }, { SkBlendMode::kColorBurn, "ColorBurn" }, { SkBlendMode::kHardLight, "HardLight" }, { SkBlendMode::kSoftLight, "SoftLight" }, { SkBlendMode::kDifference, "Difference" }, { SkBlendMode::kExclusion, "Exclusion" }, { SkBlendMode::kMultiply, "Multiply" }, { SkBlendMode::kHue, "Hue" }, { SkBlendMode::kSaturation, "Saturation" }, { SkBlendMode::kColor, "Color" }, { SkBlendMode::kLuminosity, "Luminosity" }, }; // Draw background rect SkPaint backgroundPaint; backgroundPaint.setColor(backgroundColor); canvas->drawRectCoords(0, 0, SkIntToScalar(kColWidth), SkIntToScalar(kHeight), backgroundPaint); SkScalar y = fTextHeight; for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) { SkPaint paint; paint.setColor(textColor); paint.setAntiAlias(true); paint.setSubpixelText(true); paint.setLCDRenderText(true); paint.setTextSize(fTextHeight); paint.setBlendMode(gModes[m].fMode); sk_tool_utils::set_portable_typeface(&paint); if (useGrad) { SkRect r; r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight); paint.setShader(make_shader(r)); } SkString string(gModes[m].fLabel); canvas->drawText(gModes[m].fLabel, string.size(), 0, y, paint); y+=fTextHeight; } } private: SkScalar fTextHeight; sk_sp fCheckerboard; typedef skiagm::GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM( return new LcdBlendGM; ) }