submodule/skia/docs/examples/Image_isValid.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=afc62f38aebc56af8e425297ec67dd37
   5 REG_FIDDLE(Image_isValid, 256, 256, false, 5) {
   6 void draw(SkCanvas* canvas) {
   7     auto dContext = GrAsDirectContext(canvas->recordingContext());
   8     if (!dContext) {
   9         return;
  10     }
  11
  12     auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void {
  13         if (nullptr == image) {
  14             return;
  15         }
  16         SkFont font;
  17         SkPaint paint;
  18         paint.setAntiAlias(true);
  19         canvas->drawImage(image, 0, 0);
  20         canvas->drawString(label, image->width() / 2, image->height() / 4, font, paint);
  21         if (dContext) {
  22             const char* msg = image->isValid(dContext) ? "is valid on GPU"
  23                                                        : "not valid on GPU";
  24             canvas->drawString(msg, 20, image->height() * 5 / 8, font, paint);
  25         }
  26
  27         const char* msg = image->isValid(nullptr) ? "is valid on CPU" : "not valid on CPU";
  28
  29         canvas->drawString(msg, 20, image->height() * 7 / 8, font, paint);
  30     };
  31     sk_sp<SkImage> bitmapImage(source.asImage());
  32     sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(dContext, backEndTexture,
  33                                                          kTopLeft_GrSurfaceOrigin,
  34                                                          kRGBA_8888_SkColorType,
  35                                                          kOpaque_SkAlphaType, nullptr));
  36     drawImage(image, "image");
  37     canvas->translate(image->width(), 0);
  38     drawImage(bitmapImage, "source");
  39     canvas->translate(-image->width(), image->height());
  40     drawImage(textureImage, "backEndTexture");
  41 }
  42 }  // END FIDDLE