skia2/docs/examples/Bitmap_notifyPixelsChanged.cpp

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// 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 "fiddle/examples.h"
// HASH=8f463ed17b0ed4fb9c503a0ec71706f9
REG_FIDDLE(Bitmap_notifyPixelsChanged, 256, 20, false, 0) {
void draw(SkCanvas* canvas) {
SkBitmap bitmap;
bitmap.setInfo(SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kOpaque_SkAlphaType));
bitmap.allocPixels();
bitmap.eraseColor(SK_ColorRED);
canvas->scale(16, 16);
canvas->drawBitmap(bitmap, 0, 0);
*(SkPMColor*) bitmap.getPixels() = SkPreMultiplyColor(SK_ColorBLUE);
canvas->drawBitmap(bitmap, 2, 0);
bitmap.notifyPixelsChanged();
*(SkPMColor*) bitmap.getPixels() = SkPreMultiplyColor(SK_ColorGREEN);
canvas->drawBitmap(bitmap, 4, 0);
}
} // END FIDDLE