/* * Copyright 2014 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "gm/gm.h" #include "include/core/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkImageInfo.h" #include "include/core/SkPaint.h" #include "include/core/SkRefCnt.h" #include "include/core/SkShader.h" #include "include/core/SkSize.h" #include "include/core/SkString.h" #include "include/core/SkSurface.h" #include "include/core/SkTypes.h" #include "include/gpu/GrDirectContext.h" #include "include/gpu/GrRecordingContext.h" #include "include/utils/SkRandom.h" #include "tools/ToolUtils.h" class GrSurfaceDrawContext; namespace skiagm { /* * This GM exercises SkCanvas::discard() by creating an offscreen SkSurface and repeatedly * discarding it, drawing to it, and then drawing it to the main canvas. */ class DiscardGM : public GpuGM { public: DiscardGM() {} protected: SkString onShortName() override { return SkString("discard"); } SkISize onISize() override { return SkISize::Make(100, 100); } DrawResult onDraw(GrRecordingContext* context, GrSurfaceDrawContext*, SkCanvas* canvas, SkString* errorMsg) override { auto direct = context->asDirectContext(); if (!direct) { *errorMsg = "GM relies on having access to a live direct context."; return DrawResult::kSkip; } SkISize size = this->getISize(); size.fWidth /= 10; size.fHeight /= 10; SkImageInfo info = SkImageInfo::MakeN32Premul(size); sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(direct, SkBudgeted::kNo, info); if (nullptr == surface) { *errorMsg = "Could not create render target."; return DrawResult::kFail; } canvas->clear(SK_ColorBLACK); SkRandom rand; for (int x = 0; x < 10; ++x) { for (int y = 0; y < 10; ++y) { surface->getCanvas()->discard(); // Make something that isn't too close to the background color, black. SkColor color = ToolUtils::color_to_565(rand.nextU() | 0xFF404040); switch (rand.nextULessThan(3)) { case 0: surface->getCanvas()->drawColor(color); break; case 1: surface->getCanvas()->clear(color); break; case 2: SkPaint paint; paint.setShader(SkShaders::Color(color)); surface->getCanvas()->drawPaint(paint); break; } surface->draw(canvas, 10.f*x, 10.f*y); } } surface->getCanvas()->discard(); return DrawResult::kOk; } private: using INHERITED = GM; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM(return new DiscardGM;) } // namespace skiagm