150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/*
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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 "include/core/SkBitmap.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColorFilter.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkGraphics.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkRegion.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkTime.h"
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#include "include/core/SkTypeface.h"
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#include "include/effects/SkCornerPathEffect.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/utils/SkRandom.h"
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#include "include/utils/SkTextUtils.h"
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#include "samplecode/Sample.h"
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#include "src/core/SkBlurMask.h"
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#include "src/utils/SkUTF.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkMaskFilter.h"
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#include "include/core/SkStream.h"
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static void setNamedTypeface(SkFont* font, const char name[]) {
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font->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle()));
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}
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static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
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class XfermodesBlurView : public Sample {
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SkBitmap fBG;
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SkBitmap fSrcB, fDstB;
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void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) {
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SkPaint p;
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p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
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SkBlurMask::ConvertRadiusToSigma(5)));
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SkScalar ww = SkIntToScalar(W);
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SkScalar hh = SkIntToScalar(H);
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// draw a circle covering the upper
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// left three quarters of the canvas
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p.setColor(0xFFCC44FF);
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SkRect r;
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r.setLTRB(0, 0, ww*3/4, hh*3/4);
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r.offset(x, y);
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canvas->drawOval(r, p);
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p.setBlendMode(mode);
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// draw a square overlapping the circle
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// in the lower right of the canvas
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p.setColor(0x00AA6633 | alpha << 24);
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r.setLTRB(ww/3, hh/3, ww*19/20, hh*19/20);
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r.offset(x, y);
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canvas->drawRect(r, p);
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}
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public:
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const static int W = 64;
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const static int H = 64;
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XfermodesBlurView() {
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fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType),
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gBG, 4);
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}
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protected:
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SkString name() override { return SkString("XfermodesBlur"); }
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void onDrawContent(SkCanvas* canvas) override {
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canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
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const SkBlendMode gModes[] = {
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SkBlendMode::kClear,
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SkBlendMode::kSrc,
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SkBlendMode::kDst,
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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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};
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const SkScalar w = SkIntToScalar(W);
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const SkScalar h = SkIntToScalar(H);
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SkMatrix m;
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m.setScale(SkIntToScalar(6), SkIntToScalar(6));
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auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions(), m);
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SkFont font;
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font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
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setNamedTypeface(&font, "Menlo Regular");
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const int W = 5;
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SkScalar x0 = 0;
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for (int twice = 0; twice < 2; twice++) {
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SkScalar x = x0, y = 0;
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for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
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SkRect r;
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r.setLTRB(x, y, x+w, y+h);
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SkPaint p;
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p.setStyle(SkPaint::kFill_Style);
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p.setShader(s);
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canvas->drawRect(r, p);
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canvas->saveLayer(&r, nullptr);
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draw_mode(canvas, gModes[i], twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
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canvas->restore();
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r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
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p.setStyle(SkPaint::kStroke_Style);
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p.setShader(nullptr);
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canvas->drawRect(r, p);
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const char* label = SkBlendMode_Name(gModes[i]);
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SkTextUtils::DrawString(canvas, label, x + w/2, y - font.getSize()/2, font, SkPaint(),
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SkTextUtils::kCenter_Align);
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x += w + SkIntToScalar(10);
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if ((i % W) == W - 1) {
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x = x0;
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y += h + SkIntToScalar(30);
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}
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}
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x0 += SkIntToScalar(400);
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}
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}
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private:
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using INHERITED = Sample;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new XfermodesBlurView(); )
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