157 lines
5.3 KiB
C++
157 lines
5.3 KiB
C++
/*
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* Copyright 2015 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 "gm/gm.h"
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#include "include/core/SkBlendMode.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTileMode.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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#include "tools/ToolUtils.h"
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namespace skiagm {
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constexpr int kColWidth = 180;
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constexpr int kNumCols = 4;
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constexpr int kWidth = kColWidth * kNumCols;
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constexpr int kHeight = 750;
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static sk_sp<SkShader> make_shader(const SkRect& bounds) {
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const SkPoint pts[] = {
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{ bounds.left(), bounds.top() },
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{ bounds.right(), bounds.bottom() },
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};
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const SkColor colors[] = {
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SK_ColorRED, SK_ColorGREEN,
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};
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return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
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SkTileMode::kRepeat);
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}
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class LcdBlendGM : public skiagm::GM {
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public:
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LcdBlendGM() {
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const int kPointSize = 25;
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fTextHeight = SkIntToScalar(kPointSize);
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}
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protected:
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SkString onShortName() override {
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return SkString("lcdblendmodes");
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}
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void onOnceBeforeDraw() override {
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fCheckerboard = ToolUtils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 4);
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}
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SkISize onISize() override { return SkISize::Make(kWidth, kHeight); }
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void onDraw(SkCanvas* canvas) override {
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SkPaint p;
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p.setAntiAlias(false);
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p.setStyle(SkPaint::kFill_Style);
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p.setShader(fCheckerboard);
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SkRect r = SkRect::MakeWH(SkIntToScalar(kWidth), SkIntToScalar(kHeight));
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canvas->drawRect(r, p);
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SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
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SkSurfaceProps props = SkSurfaceProps(0, kRGB_H_SkPixelGeometry);
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auto surface(ToolUtils::makeSurface(canvas, info, &props));
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SkCanvas* surfCanvas = surface->getCanvas();
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this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false);
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surfCanvas->translate(SkIntToScalar(kColWidth), 0);
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this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false);
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surfCanvas->translate(SkIntToScalar(kColWidth), 0);
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this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false);
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surfCanvas->translate(SkIntToScalar(kColWidth), 0);
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this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true);
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SkPaint surfPaint;
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surfPaint.setBlendMode(SkBlendMode::kSrcOver);
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surface->draw(canvas, 0, 0, SkSamplingOptions(), &surfPaint);
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}
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void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
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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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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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SkBlendMode::kColorDodge,
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SkBlendMode::kColorBurn,
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SkBlendMode::kHardLight,
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SkBlendMode::kSoftLight,
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SkBlendMode::kDifference,
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SkBlendMode::kExclusion,
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SkBlendMode::kMultiply,
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SkBlendMode::kHue,
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SkBlendMode::kSaturation,
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SkBlendMode::kColor,
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SkBlendMode::kLuminosity,
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};
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// Draw background rect
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SkPaint backgroundPaint;
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backgroundPaint.setColor(backgroundColor);
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canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint);
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SkScalar y = fTextHeight;
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for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
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SkPaint paint;
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paint.setColor(textColor);
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paint.setBlendMode(gModes[m]);
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SkFont font(ToolUtils::create_portable_typeface(), fTextHeight);
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font.setSubpixel(true);
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font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
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if (useGrad) {
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SkRect r;
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r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight);
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paint.setShader(make_shader(r));
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}
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SkString string(SkBlendMode_Name(gModes[m]));
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canvas->drawString(string, 0, y, font, paint);
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y+=fTextHeight;
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}
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}
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private:
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SkScalar fTextHeight;
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sk_sp<SkShader> fCheckerboard;
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using INHERITED = skiagm::GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return new LcdBlendGM; )
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} // namespace skiagm
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