submodule/skia/docs/examples/Bitmap_setAlphaType.cpp

   1 // Copyright 2019 Google LLC.
   2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
   3 #include "tools/fiddle/examples.h"
   4 // HASH=af3adcbea7b58bf90298ca5e0ea93030
   5 REG_FIDDLE(Bitmap_setAlphaType, 256, 256, true, 0) {
   6 void draw(SkCanvas* canvas) {
   7     const char* colors[] = { "Unknown", "Alpha_8", "RGB_565", "ARGB_4444", "RGBA_8888", "RGB_888x",
   8                              "BGRA_8888", "RGBA_1010102", "RGB_101010x", "Gray_8", "RGBA_F16Norm",
   9                              "RGBA_F16"};
  10     const char* alphas[] = {"Unknown ", "Opaque  ", "Premul  ", "Unpremul"};
  11     SkBitmap bitmap;
  12     SkAlphaType alphaTypes[] = { kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType,
  13     kUnpremul_SkAlphaType
  14                                };
  15     SkDebugf("%18s%15s%17s%18s%19s\n", "Canonical", "Unknown", "Opaque", "Premul", "Unpremul");
  16     for (SkColorType colorType : {
  17     kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType,
  18     kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType,
  19     kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType,
  20     kGray_8_SkColorType, kRGBA_F16_SkColorType
  21                                  } ) {
  22         for (SkAlphaType canonicalAlphaType : alphaTypes) {
  23             SkColorTypeValidateAlphaType(colorType, kUnknown_SkAlphaType, &canonicalAlphaType );
  24             SkDebugf("%12s %9s  ", colors[(int) colorType], alphas[(int) canonicalAlphaType ]);
  25             for (SkAlphaType alphaType : alphaTypes) {
  26                 bitmap.setInfo(SkImageInfo::Make(4, 4, colorType, canonicalAlphaType));
  27                 bool result = bitmap.setAlphaType(alphaType);
  28                 SkDebugf("%s %s    ", result ? "true " : "false", alphas[(int) bitmap.alphaType()]);
  29             }
  30             SkDebugf("\n");
  31         }
  32     }
  33 }
  34 }  // END FIDDLE