/* * Copyright 2013 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/SkBlurTypes.h" #include "include/core/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkColorFilter.h" #include "include/core/SkDrawLooper.h" #include "include/core/SkFont.h" #include "include/core/SkFontTypes.h" #include "include/core/SkMaskFilter.h" #include "include/core/SkMatrix.h" #include "include/core/SkPaint.h" #include "include/core/SkPath.h" #include "include/core/SkPathEffect.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/SkTextBlob.h" #include "include/core/SkTileMode.h" #include "include/core/SkTypeface.h" #include "include/core/SkTypes.h" #include "include/effects/Sk2DPathEffect.h" #include "include/effects/SkColorMatrixFilter.h" #include "include/effects/SkGradientShader.h" #include "include/effects/SkLayerDrawLooper.h" #include "include/private/SkTArray.h" #include "include/private/SkTDArray.h" #include "src/core/SkBlurMask.h" #include "tools/ToolUtils.h" #include namespace skiagm { constexpr int kWidth = 1250; constexpr int kHeight = 700; // Unlike the variant in ToolUtils, this version positions the glyphs on a diagonal static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkFont& font, SkScalar x, SkScalar y) { SkTDArray glyphs; size_t len = strlen(text); glyphs.append(font.countText(text, len, SkTextEncoding::kUTF8)); font.textToGlyphs(text, len, SkTextEncoding::kUTF8, glyphs.begin(), glyphs.count()); const SkScalar advanceX = font.getSize() * 0.85f; const SkScalar advanceY = font.getSize() * 1.5f; SkTDArray pos; for (unsigned i = 0; i < len; ++i) { *pos.append() = x + i * advanceX; *pos.append() = y + i * (advanceY / len); } const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(font, glyphs.count()); memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t)); memcpy(run.pos, pos.begin(), len * sizeof(SkScalar) * 2); } typedef void (*LooperProc)(SkPaint*); struct LooperSettings { SkBlendMode fMode; SkColor fColor; SkPaint::Style fStyle; SkScalar fWidth; SkScalar fOffset; SkScalar fSkewX; bool fEffect; }; static void mask_filter(SkPaint* paint) { paint->setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, SkBlurMask::ConvertRadiusToSigma(3.f))); } static sk_sp make_tile_effect() { SkMatrix m; m.setScale(1.f, 1.f); SkPath path; path.addCircle(0, 0, SkIntToScalar(5)); return SkPath2DPathEffect::Make(m, path); } static void path_effect(SkPaint* paint) { paint->setPathEffect(make_tile_effect()); } 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, SK_ColorBLUE, SK_ColorBLACK, SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW, }; return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kClamp); } static void color_filter(SkPaint* paint) { SkRect r; r.setWH(SkIntToScalar(kWidth), 50); paint->setShader(make_shader(r)); paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(0xF0F0F0, 0)); } static void kitchen_sink(SkPaint* paint) { color_filter(paint); path_effect(paint); mask_filter(paint); } static sk_sp setupLooper(SkLayerDrawLooper::BitFlags bits, LooperProc proc, const LooperSettings settings[], size_t size) { SkLayerDrawLooper::Builder looperBuilder; SkLayerDrawLooper::LayerInfo info; info.fPaintBits = bits; info.fColorMode = SkBlendMode::kSrc; for (size_t i = 0; i < size; i++) { info.fOffset.set(settings[i].fOffset, settings[i].fOffset); SkPaint* paint = looperBuilder.addLayer(info); paint->setBlendMode(settings[i].fMode); paint->setColor(settings[i].fColor); paint->setStyle(settings[i].fStyle); paint->setStrokeWidth(settings[i].fWidth); if (settings[i].fEffect) { (*proc)(paint); } } return looperBuilder.detach(); } class TextBlobLooperGM : public GM { public: TextBlobLooperGM() {} protected: void onOnceBeforeDraw() override { SkTextBlobBuilder builder; // LCD SkFont font; font.setSize(32); const char* text = "The quick brown fox jumps over the lazy dog"; font.setSubpixel(true); font.setEdging(SkFont::Edging::kSubpixelAntiAlias); font.setTypeface(ToolUtils::create_portable_typeface()); add_to_text_blob(&builder, text, font, 0, 0); fBlob = builder.make(); // create a looper which sandwhiches an effect in two normal draws LooperSettings looperSandwhich[] = { { SkBlendMode::kSrc, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false }, { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }, { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false }, }; LooperSettings compound[] = { { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false }, { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false }, { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false }, { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true } }; LooperSettings xfermode[] = { { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false }, { SkBlendMode::kSrcOver, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true }, { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false }, }; // NOTE, this should be ignored by textblobs LooperSettings skew[] = { { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false }, { SkBlendMode::kSrc, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false }, { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false }, }; LooperSettings kitchenSink[] = { { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false }, { SkBlendMode::kSrc, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false }, { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false }, { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true }, { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false }, }; fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit | SkLayerDrawLooper::kXfermode_Bit | SkLayerDrawLooper::kStyle_Bit, &mask_filter, compound, SK_ARRAY_COUNT(compound))); fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit | SkLayerDrawLooper::kXfermode_Bit, &path_effect, looperSandwhich, SK_ARRAY_COUNT(looperSandwhich))); fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit | SkLayerDrawLooper::kColorFilter_Bit | SkLayerDrawLooper::kXfermode_Bit, &color_filter, looperSandwhich, SK_ARRAY_COUNT(looperSandwhich))); fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit | SkLayerDrawLooper::kColorFilter_Bit | SkLayerDrawLooper::kXfermode_Bit, &color_filter, xfermode, SK_ARRAY_COUNT(xfermode))); fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew))); fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit | SkLayerDrawLooper::kShader_Bit | SkLayerDrawLooper::kColorFilter_Bit | SkLayerDrawLooper::kPathEffect_Bit | SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink, kitchenSink, SK_ARRAY_COUNT(kitchenSink))); // Test we respect overrides fLoopers.push_back(setupLooper(0, &kitchen_sink, kitchenSink, SK_ARRAY_COUNT(kitchenSink))); } SkString onShortName() override { return SkString("textbloblooper"); } SkISize onISize() override { return SkISize::Make(kWidth, kHeight); } void onDraw(SkCanvas* canvas) override { canvas->drawColor(SK_ColorGRAY); SkPaint paint; canvas->translate(10, 40); SkRect bounds = fBlob->bounds(); int y = 0; for (int looper = 0; looper < fLoopers.count(); looper++) { SkTextBlob* b = fBlob.get(); canvas->save(); canvas->translate(0, SkIntToScalar(y)); fLoopers[looper]->apply(canvas, paint, [b](SkCanvas* c, const SkPaint& p) { c->drawTextBlob(b, 0, 0, p); }); canvas->restore(); y += SkScalarFloorToInt(bounds.height()); } } private: sk_sp fBlob; SkTArray> fLoopers; typedef GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM(return new TextBlobLooperGM;) } // namespace skiagm