docs/examples/Bitmap_setAlphaType.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_setAlphaType, 256, 256, true, 0) {
void draw(SkCanvas* canvas) {
    static constexpr auto colors = std::to_array<const char*>({
            "Unknown",
            "Alpha_8",
            "RGB_565",
            "ARGB_4444",
            "RGBA_8888",
            "RGB_888x",
            "BGRA_8888",
            "RGBA_1010102",
            "BGRA_1010102",
            "RGB_101010x",
            "BGR_101010x",
            "BGR_101010x_XR",
            "BGRA_10101010_XR",
            "RGBA_10x6",
            "Gray_8",
            "RGBA_F16Norm",
            "RGBA_F16",
    });
    static constexpr auto alphas = std::to_array<const char*>({
            "Unknown ",
            "Opaque  ",
            "Premul  ",
            "Unpremul",
    });
    SkBitmap bitmap;
    SkAlphaType alphaTypes[] = { kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType,
    kUnpremul_SkAlphaType
                               };
    SkDebugf("%18s%15s%17s%18s%19s\n", "Canonical", "Unknown", "Opaque", "Premul", "Unpremul");
    for (SkColorType colorType : {
    kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType,
    kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType,
    kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType,
    kGray_8_SkColorType, kRGBA_F16_SkColorType
                                 } ) {
        for (SkAlphaType canonicalAlphaType : alphaTypes) {
            SkColorTypeValidateAlphaType(colorType, kUnknown_SkAlphaType, &canonicalAlphaType );
            SkDebugf("%12s %9s  ", colors[(int) colorType], alphas[(int) canonicalAlphaType ]);
            for (SkAlphaType alphaType : alphaTypes) {
                bitmap.setInfo(SkImageInfo::Make(4, 4, colorType, canonicalAlphaType));
                bool result = bitmap.setAlphaType(alphaType);
                SkDebugf("%s %s    ", result ? "true " : "false", alphas[(int) bitmap.alphaType()]);
            }
            SkDebugf("\n");
        }
    }
}
}  // END FIDDLE