docs/examples/Bitmap_swap.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"

#include <array>

REG_FIDDLE(Bitmap_swap, 256, 256, true, 0) {
void draw(SkCanvas* canvas) {
    auto debugster = [](const char* prefix, const SkBitmap& b) -> void {
        static constexpr auto alphas = std::to_array<const char*>({
                "Unknown",
                "Opaque",
                "Premul",
                "Unpremul",
        });
        static constexpr auto colors = std::to_array<const char*>({
                "Unknown",
                "Alpha_8",
                "RGB_565",
                "ARGB_4444",
                "RGBA_8888",
                "RGB_888x",
                "BGRA_8888",
                "RGBA_1010102",
                "RGB_101010x",
                "Gray_8",
                "RGBA_F16Norm",
                "RGBA_F16",
        });
        SkDebugf("%s width:%d height:%d colorType:k%s_SkColorType alphaType:k%s_SkAlphaType\n",
                 prefix, b.width(), b.height(), colors[b.colorType()], alphas[b.alphaType()]);
    };
    SkBitmap one, two;
    if (!one.tryAllocPixels(
            SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kOpaque_SkAlphaType))) {
        return;
    }
    if (!two.tryAllocPixels(
            SkImageInfo::Make(2, 2, kBGRA_8888_SkColorType, kPremul_SkAlphaType))) {
        return;
    }
    for (int index = 0; index < 2; ++index) {
       debugster("one", one);
       debugster("two", two);
       one.swap(two);
    }
}
}  // END FIDDLE