137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
/*
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* Copyright 2018 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/SkBitmap.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/SkRect.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/SkTypeface.h"
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#include "include/utils/SkTextUtils.h"
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#include "tools/ToolUtils.h"
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#include <initializer_list>
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namespace skiagm {
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// This GM recreates the blend mode images from the Android documentation
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class AndroidBlendModesGM : public GM {
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public:
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AndroidBlendModesGM() {
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this->setBGColor(SK_ColorBLACK);
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}
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protected:
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SkString onShortName() override {
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return SkString("androidblendmodes");
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}
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SkISize onISize() override {
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return SkISize::Make(kNumCols * kBitmapSize, kNumRows * kBitmapSize);
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}
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void onOnceBeforeDraw() override {
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SkImageInfo ii = SkImageInfo::MakeN32Premul(kBitmapSize, kBitmapSize);
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{
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fCompositeSrc.allocPixels(ii);
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SkCanvas tmp(fCompositeSrc);
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tmp.clear(SK_ColorTRANSPARENT);
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SkPaint p;
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p.setAntiAlias(true);
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p.setColor(ToolUtils::color_to_565(kBlue));
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tmp.drawRect(SkRect::MakeLTRB(16, 96, 160, 240), p);
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}
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{
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fCompositeDst.allocPixels(ii);
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SkCanvas tmp(fCompositeDst);
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tmp.clear(SK_ColorTRANSPARENT);
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SkPaint p;
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p.setAntiAlias(true);
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p.setColor(ToolUtils::color_to_565(kRed));
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tmp.drawCircle(160, 95, 80, p);
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}
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}
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void drawTile(SkCanvas* canvas, int xOffset, int yOffset, SkBlendMode mode) {
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canvas->translate(xOffset, yOffset);
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canvas->clipRect(SkRect::MakeXYWH(0, 0, 256, 256));
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canvas->saveLayer(nullptr, nullptr);
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SkPaint p;
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canvas->drawImage(fCompositeDst.asImage(), 0, 0, SkSamplingOptions(), &p);
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p.setBlendMode(mode);
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canvas->drawImage(fCompositeSrc.asImage(), 0, 0, SkSamplingOptions(), &p);
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}
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void onDraw(SkCanvas* canvas) override {
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SkFont font(ToolUtils::create_portable_typeface());
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ToolUtils::draw_checkerboard(canvas, kWhite, kGrey, 32);
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int xOffset = 0, yOffset = 0;
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// Android doesn't expose all the blend modes
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// Note that the Android documentation calls:
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// Skia's kPlus, add
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// Skia's kModulate, multiply
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for (SkBlendMode mode : { SkBlendMode::kPlus /* add */, SkBlendMode::kClear,
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SkBlendMode::kDarken, SkBlendMode::kDst,
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SkBlendMode::kDstATop, SkBlendMode::kDstIn,
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SkBlendMode::kDstOut, SkBlendMode::kDstOver,
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SkBlendMode::kLighten, SkBlendMode::kModulate /* multiply */,
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SkBlendMode::kOverlay, SkBlendMode::kScreen,
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SkBlendMode::kSrc, SkBlendMode::kSrcATop,
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SkBlendMode::kSrcIn, SkBlendMode::kSrcOut,
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SkBlendMode::kSrcOver, SkBlendMode::kXor } ) {
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int saveCount = canvas->save();
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this->drawTile(canvas, xOffset, yOffset, mode);
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canvas->restoreToCount(saveCount);
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SkTextUtils::DrawString(canvas, SkBlendMode_Name(mode),
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xOffset + kBitmapSize/2.0f,
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yOffset + kBitmapSize,
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font, SkPaint(), SkTextUtils::kCenter_Align);
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xOffset += 256;
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if (xOffset >= 1024) {
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xOffset = 0;
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yOffset += 256;
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}
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}
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}
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private:
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static const int kBitmapSize = 256;
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static const int kNumRows = 5;
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static const int kNumCols = 4;
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static const SkColor kBlue = SkColorSetARGB(255, 22, 150, 243);
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static const SkColor kRed = SkColorSetARGB(255, 233, 30, 99);
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static const SkColor kWhite = SkColorSetARGB(255, 243, 243, 243);
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static const SkColor kGrey = SkColorSetARGB(255, 222, 222, 222);
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SkBitmap fCompositeSrc;
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SkBitmap fCompositeDst;
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using INHERITED = GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new AndroidBlendModesGM;)
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} // namespace skiagm
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