skia2/docs/examples/Surface_MakeFromBackendTexture.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"
// HASH=d3aec071998f871809f515e58abb1b0e
REG_FIDDLE(Surface_MakeFromBackendTexture, 256, 256, false, 3) {
void draw(SkCanvas* canvas) {
    SkFont font(nullptr, 32);
    SkPaint paint;

    GrRecordingContext* context = canvas->recordingContext();
    if (!context) {
         canvas->drawString("GPU only!", 20, 40, font, paint);
         return;
    }
    GrDirectContext* direct = context->asDirectContext();
    if (!direct) {
         canvas->drawString("Direct Context only!", 20, 40, font, paint);
         return;
    }

    sk_sp<SkSurface> gpuSurface = SkSurface::MakeFromBackendTexture(direct,
                                                                    backEndTexture,
                                                                    kTopLeft_GrSurfaceOrigin,
                                                                    0,
                                                                    kRGBA_8888_SkColorType,
                                                                    nullptr,
                                                                    nullptr,
                                                                    nullptr);
    auto surfaceCanvas = gpuSurface->getCanvas();
    surfaceCanvas->drawString("GPU rocks!", 20, 40, font, paint);
    sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
    canvas->drawImage(image, 0, 0);
}
}  // END FIDDLE