third_party/canvaskit/BUILD.gn

# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/toolchain/wasm.gni")

# This toolchain is only to be used by the canvaskit target below.
wasm_toolchain("canvaskit") {
  extra_toolchain_args = {
    # Include ICU data.
    skia_use_icu = true
    skia_use_client_icu = false

    # Include image codecs.
    skia_use_libjpeg_turbo_decode = true
    skia_use_libpng_decode = true
    skia_use_libwebp_decode = true

    # Disable LTO.
    enable_lto = false
  }
}

copy("canvaskit_group") {
  visibility = [ "//flutter/web_sdk:*" ]
  public_deps = [ "//flutter/skia/modules/canvaskit(:canvaskit)" ]

  sources = [
    "$root_out_dir/canvaskit/canvaskit.js",
    "$root_out_dir/canvaskit/canvaskit.js.symbols",
    "$root_out_dir/canvaskit/canvaskit.wasm",
  ]
  outputs = [ "$root_out_dir/flutter_web_sdk/canvaskit/{{source_file_part}}" ]
}

# This toolchain is only to be used by canvaskit_chromium_group below.
wasm_toolchain("canvaskit_chromium") {
  extra_toolchain_args = {
    # In Chromium browsers, we can use the browser's APIs to get the necessary
    # ICU data.
    skia_use_icu = false
    skia_use_client_icu = true
    skia_icu_bidi_third_party_dir = "//flutter/third_party/canvaskit/icu_bidi"

    # TODO(mdebbar): Set these to false once all image decoding can be done
    # using the browser's built-in codecs.
    # https://github.com/flutter/flutter/issues/122331

    # In Chromium browsers, we can use the browser's built-in codecs.
    skia_use_libjpeg_turbo_decode = true
    skia_use_libpng_decode = true
    skia_use_libwebp_decode = true

    # Disable LTO.
    enable_lto = false
  }
}

copy("canvaskit_chromium_group") {
  visibility = [ "//flutter/web_sdk:*" ]
  public_deps = [ "//flutter/skia/modules/canvaskit(:canvaskit_chromium)" ]

  sources = [
    "$root_out_dir/canvaskit_chromium/canvaskit.js",
    "$root_out_dir/canvaskit_chromium/canvaskit.js.symbols",
    "$root_out_dir/canvaskit_chromium/canvaskit.wasm",
  ]
  outputs = [
    "$root_out_dir/flutter_web_sdk/canvaskit/chromium/{{source_file_part}}",
  ]
}

# This toolchain is only to be used by skwasm_group below.
wasm_toolchain("skwasm") {
  extra_toolchain_args = {
    # In Chromium browsers, we can use the browser's APIs to get the necessary
    # ICU data.
    skia_use_icu = false
    skia_use_client_icu = true
    skia_icu_bidi_third_party_dir = "//flutter/third_party/canvaskit/icu_bidi"

    skia_use_libjpeg_turbo_decode = false
    skia_use_libpng_decode = false
    skia_use_libwebp_decode = false

    # We use OffscreenCanvas to produce PNG data instead of skia
    skia_use_no_png_encode = true
    skia_use_libpng_encode = false

    # skwasm is multithreaded
    wasm_use_pthreads = true
    wasm_prioritize_size = true
  }
}

copy("skwasm_group") {
  visibility = [ "//flutter/web_sdk:*" ]
  public_deps = [ "//flutter/lib/web_ui/skwasm(:skwasm)" ]

  sources = [
    "$root_out_dir/skwasm/skwasm.js",
    "$root_out_dir/skwasm/skwasm.js.symbols",
    "$root_out_dir/skwasm/skwasm.wasm",
    "$root_out_dir/skwasm/skwasm.worker.js",
  ]
  if (is_debug) {
    if (!wasm_use_dwarf) {
      sources += [ "$root_out_dir/skwasm/skwasm.wasm.map" ]
    }
  }
  outputs = [ "$root_out_dir/flutter_web_sdk/canvaskit/{{source_file_part}}" ]
}