skia2/docs/examples/Canvas_writePixels.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=29b98ebf58aa9fd1edfaabf9f4490b3a
REG_FIDDLE(Canvas_writePixels, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
    SkImageInfo imageInfo = SkImageInfo::MakeN32(256, 1, kPremul_SkAlphaType);
    for (int y = 0; y < 256; ++y) {
        uint32_t pixels[256];
        for (int x = 0; x < 256; ++x) {
            pixels[x] = SkColorSetARGB(x, (x + y) % 256, x, (x - y) & 0xFF);
        }
        canvas->writePixels(imageInfo, &pixels, sizeof(pixels), 0, y);
    }
}
}  // END FIDDLE