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107 lines
3.0 KiB
107 lines
3.0 KiB
/* |
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* Copyright 2011 Google Inc. |
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* |
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* Use of this source code is governed by a BSD-style license that can be |
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* found in the LICENSE file. |
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*/ |
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#include "DecodeFile.h" |
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#include "Sample.h" |
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#include "SkCanvas.h" |
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#include "SkGradientShader.h" |
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#include "SkGraphics.h" |
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#include "SkPath.h" |
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#include "SkRegion.h" |
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#include "SkShader.h" |
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#include "SkUTF.h" |
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#include "SkColorPriv.h" |
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#include "SkColorFilter.h" |
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#include "SkTime.h" |
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#include "SkTypeface.h" |
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static sk_sp<SkShader> make_bitmapfade(const SkBitmap& bm) { |
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SkPoint pts[2]; |
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SkColor colors[2]; |
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pts[0].set(0, 0); |
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pts[1].set(0, SkIntToScalar(bm.height())); |
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colors[0] = SK_ColorBLACK; |
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colors[1] = SkColorSetARGB(0, 0, 0, 0); |
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auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
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auto shaderB = SkShader::MakeBitmapShader(bm, |
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SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); |
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return SkShader::MakeComposeShader(std::move(shaderB), std::move(shaderA), SkBlendMode::kDstIn); |
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} |
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class ShaderView : public Sample { |
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public: |
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sk_sp<SkShader> fShader; |
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SkBitmap fBitmap; |
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ShaderView() { |
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decode_file("/skimages/logo.gif", &fBitmap); |
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SkPoint pts[2]; |
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SkColor colors[2]; |
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pts[0].set(0, 0); |
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pts[1].set(SkIntToScalar(100), 0); |
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colors[0] = SK_ColorRED; |
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colors[1] = SK_ColorBLUE; |
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auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
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pts[0].set(0, 0); |
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pts[1].set(0, SkIntToScalar(100)); |
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colors[0] = SK_ColorBLACK; |
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colors[1] = SkColorSetARGB(0x80, 0, 0, 0); |
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auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
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fShader = SkShader::MakeComposeShader(std::move(shaderA), std::move(shaderB), |
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SkBlendMode::kDstIn); |
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} |
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protected: |
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bool onQuery(Sample::Event* evt) override { |
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if (Sample::TitleQ(*evt)) { |
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Sample::TitleR(evt, "Shaders"); |
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return true; |
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} |
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return this->INHERITED::onQuery(evt); |
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} |
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void onDrawContent(SkCanvas* canvas) override { |
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canvas->drawBitmap(fBitmap, 0, 0); |
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canvas->translate(20, 120); |
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SkPaint paint; |
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SkRect r; |
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paint.setColor(SK_ColorGREEN); |
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canvas->drawRect(SkRect::MakeWH(100, 100), paint); |
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paint.setShader(fShader); |
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canvas->drawRect(SkRect::MakeWH(100, 100), paint); |
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canvas->translate(SkIntToScalar(110), 0); |
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int w = fBitmap.width(); |
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int h = fBitmap.height(); |
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w = 120; |
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h = 80; |
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r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h)); |
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paint.setShader(nullptr); |
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canvas->drawRect(r, paint); |
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paint.setShader(make_bitmapfade(fBitmap)); |
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canvas->drawRect(r, paint); |
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} |
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private: |
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typedef Sample INHERITED; |
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}; |
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////////////////////////////////////////////////////////////////////////////// |
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DEF_SAMPLE( return new ShaderView(); )
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