74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// Copyright 2020 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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REG_FIDDLE(BlendModes, 256, 4352, false, 0) {
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void drawBG(SkCanvas* canvas) {
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SkColor radColors[] = {0xFFFFFFFF, 0xFFFFFFFF, 0x00FFFFFF};
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auto rad = SkGradientShader::MakeRadial(SkPoint::Make(128, 128), 128, radColors, nullptr, 3,
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SkTileMode::kClamp);
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SkMatrix rotMtx;
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rotMtx.setRotate(-90, 128, 128);
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SkColor sweepColors[] = {0xFFFF00FF, 0xFFFF0000, 0xFFFFFF00, 0xFF00FF00,
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0xFF00FFFF, 0xFF0000FF, 0xFFFF00FF};
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auto sweep = SkGradientShader::MakeSweep(128, 128, sweepColors, nullptr, 7, 0, &rotMtx);
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auto comp = SkShaders::Blend(SkBlendMode::kModulate, std::move(rad), std::move(sweep));
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SkPaint p;
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p.setShader(std::move(comp));
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canvas->drawPaint(p);
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}
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void draw(SkCanvas* canvas) {
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SkBlendMode blendModes[] = {
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SkBlendMode::kDst,
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SkBlendMode::kSrc,
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SkBlendMode::kSrcOver,
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SkBlendMode::kDstOver,
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SkBlendMode::kSrcIn,
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SkBlendMode::kDstIn,
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SkBlendMode::kSrcOut,
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SkBlendMode::kDstOut,
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SkBlendMode::kSrcATop,
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SkBlendMode::kDstATop,
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SkBlendMode::kXor,
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SkBlendMode::kPlus,
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SkBlendMode::kModulate,
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SkBlendMode::kScreen,
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SkBlendMode::kOverlay,
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SkBlendMode::kDarken,
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SkBlendMode::kLighten,
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};
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SkPaint labelPaint;
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labelPaint.setAntiAlias(true);
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SkFont font(nullptr, 12);
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for (auto mode : blendModes) {
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SkPaint layerPaint;
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layerPaint.setBlendMode(mode);
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canvas->save();
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canvas->clipRect(SkRect::MakeWH(256, 256));
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drawBG(canvas);
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canvas->saveLayer(nullptr, &layerPaint);
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const SkScalar r = 80;
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SkPaint discP;
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discP.setAntiAlias(true);
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discP.setBlendMode(SkBlendMode::kPlus);
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discP.setColor(SK_ColorGREEN); canvas->drawCircle(128, r, r, discP);
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discP.setColor(SK_ColorRED); canvas->drawCircle(r, 256 - r, r, discP);
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discP.setColor(SK_ColorBLUE); canvas->drawCircle(256 - r, 256 - r, r, discP);
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canvas->restore();
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canvas->drawSimpleText(SkBlendMode_Name(mode), strlen(SkBlendMode_Name(mode)),
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SkTextEncoding::kUTF8, 10, 10, font, labelPaint);
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canvas->restore();
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canvas->translate(0, 256);
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}
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}
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} // END FIDDLE
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