submodule/skia/docs/examples/Image_MakeBackendTextureFromSkImage.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=06aeb3cf63ffccf7b49fe556e5def351
   5 REG_FIDDLE(Image_MakeBackendTextureFromSkImage, 256, 64, false, 0) {
   6 static sk_sp<SkImage> create_gpu_image(GrRecordingContext* rContext) {
   7     const SkImageInfo info = SkImageInfo::MakeN32(20, 20, kOpaque_SkAlphaType);
   8     auto surface(SkSurface::MakeRenderTarget(rContext, SkBudgeted::kNo, info));
   9     SkCanvas* canvas = surface->getCanvas();
  10     canvas->clear(SK_ColorWHITE);
  11     SkPaint paint;
  12     paint.setColor(SK_ColorBLACK);
  13     canvas->drawRect(SkRect::MakeXYWH(5, 5, 10, 10), paint);
  14     return surface->makeImageSnapshot();
  15 }
  16
  17 void draw(SkCanvas* canvas) {
  18     auto dContext = GrAsDirectContext(canvas->recordingContext());
  19     if (!dContext) {
  20         return;
  21     }
  22     sk_sp<SkImage> backEndImage = create_gpu_image(dContext);
  23     canvas->drawImage(backEndImage, 0, 0);
  24     GrBackendTexture texture;
  25     SkImage::BackendTextureReleaseProc proc;
  26     if (!SkImage::MakeBackendTextureFromSkImage(dContext, std::move(backEndImage),
  27                                                 &texture, &proc)) {
  28         return;
  29     }
  30     sk_sp<SkImage> i2 = SkImage::MakeFromTexture(dContext, texture, kTopLeft_GrSurfaceOrigin,
  31                                                  kN32_SkColorType, kOpaque_SkAlphaType, nullptr);
  32     canvas->drawImage(i2, 30, 30);
  33 }
  34 }  // END FIDDLE