docs/examples/Surface_makeImageSnapshot_2.cpp

// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
REG_FIDDLE(Surface_makeImageSnapshot_2, 256, 64, false, 0) {
void draw(SkCanvas* canvas) {
    sk_sp<SkSurface> big(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(64, 64)));
    sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
    big->getCanvas()->clear(SK_ColorRED);
    lil->getCanvas()->clear(SK_ColorBLACK);
    sk_sp<SkImage> early(big->makeImageSnapshot());
    lil->draw(big->getCanvas(), 16, 16);
    sk_sp<SkImage> later(big->makeImageSnapshot({0, 0, 16, 16}));
    canvas->drawImage(early, 0, 0);
    canvas->drawImage(later, 0, 0);
}
}  // END FIDDLE