submodule/skia/docs/examples/Surface_characterize.cpp

   1 // Copyright 2019 Google LLC.
   2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
   3 #include "tools/fiddle/examples.h"
   4 // HASH=6de6f3ef699a72ff26da1b26b23a3316
   5 REG_FIDDLE(Surface_characterize, 256, 64, false, 0) {
   6 void draw(SkCanvas* canvas) {
   7     SkFont font(nullptr, 32);
   8     SkPaint paint;
   9     auto context = canvas->recordingContext();
  10     if (!context) {
  11          canvas->drawString("GPU only!", 20, 40, font, paint);
  12          return;
  13     }
  14     sk_sp<SkSurface> gpuSurface = SkSurface::MakeRenderTarget(
  15             context, SkBudgeted::kYes, SkImageInfo::MakeN32Premul(64, 64));
  16     SkSurfaceCharacterization characterization;
  17     if (!gpuSurface->characterize(&characterization)) {
  18          canvas->drawString("characterization unsupported", 20, 40, font, paint);
  19          return;
  20     }
  21     // start of threadable work
  22     SkDeferredDisplayListRecorder recorder(characterization);
  23     SkCanvas* subCanvas = recorder.getCanvas();
  24     subCanvas->clear(SK_ColorGREEN);
  25     sk_sp<SkDeferredDisplayList> displayList = recorder.detach();
  26     // end of threadable work
  27     gpuSurface->draw(displayList);
  28     sk_sp<SkImage> img = gpuSurface->makeImageSnapshot();
  29     canvas->drawImage(std::move(img), 0, 0);
  30 }
  31 }  // END FIDDLE