submodule/skia/docs/examples/Surface_MakeFromBackendTexture.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=d3aec071998f871809f515e58abb1b0e
   5 REG_FIDDLE(Surface_MakeFromBackendTexture, 256, 256, false, 3) {
   6 void draw(SkCanvas* canvas) {
   7     SkFont font(nullptr, 32);
   8     SkPaint paint;
   9
  10     GrRecordingContext* context = canvas->recordingContext();
  11     if (!context) {
  12          canvas->drawString("GPU only!", 20, 40, font, paint);
  13          return;
  14     }
  15     GrDirectContext* direct = context->asDirectContext();
  16     if (!direct) {
  17          canvas->drawString("Direct Context only!", 20, 40, font, paint);
  18          return;
  19     }
  20
  21     sk_sp<SkSurface> gpuSurface = SkSurface::MakeFromBackendTexture(direct,
  22                                                                     backEndTexture,
  23                                                                     kTopLeft_GrSurfaceOrigin,
  24                                                                     0,
  25                                                                     kRGBA_8888_SkColorType,
  26                                                                     nullptr,
  27                                                                     nullptr,
  28                                                                     nullptr);
  29     auto surfaceCanvas = gpuSurface->getCanvas();
  30     surfaceCanvas->drawString("GPU rocks!", 20, 40, font, paint);
  31     sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
  32     canvas->drawImage(image, 0, 0);
  33 }
  34 }  // END FIDDLE