| /* |
| * 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 "src/base/SkRandom.h" |
| #include "tools/ToolUtils.h" |
| |
| 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 GM { |
| |
| public: |
| DiscardGM() {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("discard"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(100, 100); |
| } |
| |
| DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override { |
| |
| SkISize size = this->getISize(); |
| size.fWidth /= 10; |
| size.fHeight /= 10; |
| SkImageInfo info = SkImageInfo::MakeN32Premul(size); |
| sk_sp<SkSurface> surface; |
| |
| auto dContext = GrAsDirectContext(canvas->recordingContext()); |
| if (dContext && !dContext->abandoned()) { |
| surface = SkSurface::MakeRenderTarget(dContext, skgpu::Budgeted::kNo, info); |
| } |
| |
| #if defined(SK_GRAPHITE) |
| auto recorder = canvas->recorder(); |
| if (recorder) { |
| surface = SkSurface::MakeGraphite(recorder, info); |
| } |
| #endif |
| |
| if (!surface) { |
| surface = SkSurface::MakeRaster(info); |
| } |
| if (!surface) { |
| *errorMsg = "Could not create surface."; |
| 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; |
| } |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new DiscardGM;) |
| |
| } // namespace skiagm |