| /* |
| * 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 { |
| |
| static const int kColWidth = 180; |
| static const int kNumCols = 4; |
| static const int kWidth = kColWidth * kNumCols; |
| static const int kHeight = 750; |
| |
| static 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::CreateLinear(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); |
| SkAutoTUnref<SkSurface> surface(canvas->newSurface(info)); |
| if (nullptr == surface) { |
| surface.reset(SkSurface::NewRaster(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; |
| SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(SkXfermode::kSrcOver_Mode)); |
| surfPaint.setXfermode(xfermode); |
| surface->draw(canvas, 0, 0, &surfPaint); |
| } |
| |
| void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) { |
| const struct { |
| SkXfermode::Mode fMode; |
| const char* fLabel; |
| } gModes[] = { |
| { SkXfermode::kClear_Mode, "Clear" }, |
| { SkXfermode::kSrc_Mode, "Src" }, |
| { SkXfermode::kDst_Mode, "Dst" }, |
| { SkXfermode::kSrcOver_Mode, "SrcOver" }, |
| { SkXfermode::kDstOver_Mode, "DstOver" }, |
| { SkXfermode::kSrcIn_Mode, "SrcIn" }, |
| { SkXfermode::kDstIn_Mode, "DstIn" }, |
| { SkXfermode::kSrcOut_Mode, "SrcOut" }, |
| { SkXfermode::kDstOut_Mode, "DstOut" }, |
| { SkXfermode::kSrcATop_Mode, "SrcATop" }, |
| { SkXfermode::kDstATop_Mode, "DstATop" }, |
| { SkXfermode::kXor_Mode, "Xor" }, |
| { SkXfermode::kPlus_Mode, "Plus" }, |
| { SkXfermode::kModulate_Mode, "Modulate" }, |
| { SkXfermode::kScreen_Mode, "Screen" }, |
| { SkXfermode::kOverlay_Mode, "Overlay" }, |
| { SkXfermode::kDarken_Mode, "Darken" }, |
| { SkXfermode::kLighten_Mode, "Lighten" }, |
| { SkXfermode::kColorDodge_Mode, "ColorDodge" }, |
| { SkXfermode::kColorBurn_Mode, "ColorBurn" }, |
| { SkXfermode::kHardLight_Mode, "HardLight" }, |
| { SkXfermode::kSoftLight_Mode, "SoftLight" }, |
| { SkXfermode::kDifference_Mode, "Difference" }, |
| { SkXfermode::kExclusion_Mode, "Exclusion" }, |
| { SkXfermode::kMultiply_Mode, "Multiply" }, |
| { SkXfermode::kHue_Mode, "Hue" }, |
| { SkXfermode::kSaturation_Mode, "Saturation" }, |
| { SkXfermode::kColor_Mode, "Color" }, |
| { SkXfermode::kLuminosity_Mode, "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++) { |
| SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(gModes[m].fMode)); |
| SkPaint paint; |
| paint.setColor(textColor); |
| paint.setAntiAlias(true); |
| paint.setSubpixelText(true); |
| paint.setLCDRenderText(true); |
| paint.setTextSize(fTextHeight); |
| paint.setXfermode(xfermode); |
| sk_tool_utils::set_portable_typeface(&paint); |
| if (useGrad) { |
| SkRect r; |
| r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight); |
| paint.setShader(make_shader(r))->unref(); |
| } |
| SkString string(gModes[m].fLabel); |
| canvas->drawText(gModes[m].fLabel, string.size(), 0, y, paint); |
| y+=fTextHeight; |
| } |
| } |
| |
| private: |
| SkScalar fTextHeight; |
| sk_sp<SkShader> fCheckerboard; |
| typedef skiagm::GM INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM( return new LcdBlendGM; ) |
| } |