# Copyright (c) 2013 The Chromium 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/config/features.gni")
import("//build/config/ui.gni")
import("//testing/test.gni")
if (current_cpu == "arm" || current_cpu == "arm64") {
  import("//build/config/arm.gni")
}
if (current_cpu == "mipsel" || current_cpu == "mips64el") {
  import("//build/config/mips.gni")
}

# The list of Skia defines that are to be set for chromium.
gypi_skia_defines =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path(
                      "//third_party/skia/gyp/skia_for_chromium_defines.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/skia_for_chromium_defines.gypi" ])

# The list of Skia core sources that are to be set for chromium.
gypi_skia_core =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("//third_party/skia/gyp/core.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/core.gypi" ])

# The list of Skia gpu sources that are to be set for chromium.
gypi_skia_gpu =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("//third_party/skia/gyp/gpu.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/gpu.gypi" ])

# The list of Skia effects that are to be set for chromium.
gypi_skia_effects =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("//third_party/skia/gyp/effects.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/effects.gypi" ])

# The list of Skia utils that are to be set for chromium.
gypi_skia_utils =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("//third_party/skia/gyp/utils.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/utils.gypi" ])

gypi_skia_opts =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("//third_party/skia/gyp/opts.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "//third_party/skia/gyp/opts.gypi" ])

# The list of Skia files is kept in skia_gn_files.gypi. Read it.
gypi_values =
    exec_script("//build/gypi_to_gn.py",
                [
                  rebase_path("skia_gn_files.gypi"),
                  "--replace=<(skia_include_path)=//third_party/skia/include",
                  "--replace=<(skia_src_path)=//third_party/skia/src",
                ],
                "scope",
                [ "skia_gn_files.gypi" ])

# External-facing config for dependent code.
config("skia_config") {
  include_dirs = [
    "config",
    "ext",
    "//third_party/skia/include/c",
    "//third_party/skia/include/config",
    "//third_party/skia/include/core",
    "//third_party/skia/include/effects",
    "//third_party/skia/include/images",
    "//third_party/skia/include/lazy",
    "//third_party/skia/include/pathops",
    "//third_party/skia/include/pdf",
    "//third_party/skia/include/pipe",
    "//third_party/skia/include/ports",
    "//third_party/skia/include/utils",
  ]

  defines = gypi_skia_defines.skia_for_chromium_defines

  defines += [ "SK_SUPPORT_LEGACY_SHADERBITMAPTYPE" ]

  if (component_mode == "shared_library") {
    defines += [
      "SKIA_DLL",
      "GR_GL_IGNORE_ES3_MSAA=0",
    ]
  }

  include_dirs += [
    "//third_party/skia/include/gpu",
    "//third_party/skia/src/gpu",
  ]
  defines += [ "SK_SUPPORT_GPU=1" ]

  if (is_android) {
    defines += [
      "SK_BUILD_FOR_ANDROID",
      "USE_CHROMIUM_SKIA",
    ]
  }

  if (is_mac) {
    defines += [ "SK_BUILD_FOR_MAC" ]
  } else if (is_ios) {
    defines += [ "SK_BUILD_FOR_IOS" ]
  } else {
    defines += [ "SK_BUILD_FOR_UNIX" ]
  }
}

# Internal-facing config for Skia library code.
config("skia_library_config") {
  # These include directories are only included for Skia code and are not
  # exported to dependents. It's not clear if this is on purpose, but this
  # matches the GYP build.
  include_dirs = [
    "//third_party/skia/include/private",
    "//third_party/skia/src/core",
    "//third_party/skia/src/image",
    "//third_party/skia/src/opts",
    "//third_party/skia/src/pdf",
    "//third_party/skia/src/ports",
    "//third_party/skia/src/sfnt",
    "//third_party/skia/src/utils",
    "//third_party/skia/src/lazy",
  ]
  if (is_mac || is_ios) {
    include_dirs += [ "//third_party/skia/include/utils/mac" ]
  }
  if (is_mac) {
    include_dirs += [ "//third_party/skia/include/utils/ios" ]
  }

  defines = []

  if (component_mode == "shared_library") {
    defines += [ "SKIA_IMPLEMENTATION=1" ]
  }

  if (current_cpu == "arm") {
    if (arm_use_neon) {
      defines += [ "SK_ARM_HAS_NEON" ]
    }
    if (arm_optionally_use_neon) {
      defines += [ "SK_ARM_HAS_OPTIONAL_NEON" ]
    }
  }

  # Settings for text blitting, chosen to approximate the system browser.
  if (is_linux) {
    defines += [
      "SK_GAMMA_EXPONENT=1.2",
      "SK_GAMMA_CONTRAST=0.2",
      "SK_HIGH_QUALITY_IS_LANCZOS",
    ]
  } else if (is_android) {
    defines += [
      "SK_GAMMA_APPLY_TO_A8",
      "SK_GAMMA_EXPONENT=1.4",
      "SK_GAMMA_CONTRAST=0.0",
    ]
  } else if (is_mac) {
    defines += [
      "SK_GAMMA_SRGB",
      "SK_GAMMA_CONTRAST=0.0",
      "SK_HIGH_QUALITY_IS_LANCZOS",
    ]
  }

  if (is_android) {
    defines += [
      # Android devices are typically more memory constrained, so default to a
      # smaller glyph cache (it may be overriden at runtime when the renderer
      # starts up, depending on the actual device memory).
      "SK_DEFAULT_FONT_CACHE_LIMIT=1048576",  # 1024 * 1024
    ]
  } else {
    defines += [ "SK_DEFAULT_FONT_CACHE_LIMIT=20971520" ]  # 20 * 1024 * 1024
  }

  if (is_ios) {
    cflags = [
      # Skia uses routines deprecated in iOS 7 and above
      "-Wno-deprecated-declarations",
    ]

    libs = [ "ImageIO.framework" ]
  }
}

component("skia") {
  sources = [
    # Chrome sources.
    "config/SkUserConfig.h",
    "ext/SkDiscardableMemory_chrome.cc",
    "ext/SkDiscardableMemory_chrome.h",
    "ext/SkMemory_new_handler.cpp",
    "ext/convolver.cc",
    "ext/convolver.h",
    "ext/event_tracer_impl.cc",
    "ext/event_tracer_impl.h",
    "ext/google_logging.cc",
  ]

  # The skia gypi values are relative to the skia_dir, so we need to rebase.
  sources += gypi_skia_core.sources
  sources += gypi_skia_effects.sources
  sources += gypi_skia_utils.sources
  sources += gypi_values.skia_library_sources

  # This and skia_opts are really the same conceptual target so share headers.
  allow_circular_includes_from = [ ":skia_opts" ]

  if (current_cpu == "arm") {
    sources += [
      "//third_party/skia/src/core/SkUtilsArm.cpp",
      "//third_party/skia/src/core/SkUtilsArm.h",
    ]
  }

  # GPU

  sources += gypi_skia_gpu.skgpu_sources
  sources += gypi_skia_gpu.skgpu_null_gl_sources

  # Remove unused util files include in utils.gypi
  sources -= [
    "//third_party/skia/src/utils/SkBoundaryPatch.cpp",
    "//third_party/skia/src/utils/SkCamera.cpp",
    "//third_party/skia/src/utils/SkCanvasStack.h",
    "//third_party/skia/src/utils/SkDumpCanvas.cpp",
    "//third_party/skia/src/utils/SkFloatUtils.h",
    "//third_party/skia/src/utils/SkFrontBufferedStream.cpp",
    "//third_party/skia/src/utils/SkInterpolator.cpp",
    "//third_party/skia/src/utils/SkLayer.cpp",
    "//third_party/skia/src/utils/SkMeshUtils.cpp",
    "//third_party/skia/src/utils/SkNinePatch.cpp",
    "//third_party/skia/src/utils/SkParsePath.cpp",

    #testing
    "//third_party/skia/src/fonts/SkGScalerContext.cpp",
    "//third_party/skia/src/fonts/SkGScalerContext.h",
  ]

  if (is_ios || is_mac || is_android) {
    sources -=
        [ "//third_party/skia/src/gpu/gl/GrGLCreateNativeInterface_none.cpp" ]

    set_sources_assignment_filter([])

    if (is_ios) {
      sources += [ "//third_party/skia/src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp" ]
    } else if (is_mac) {
      sources += [ "//third_party/skia/src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp" ]
    } else if (is_android) {
      sources += [ "//third_party/skia/src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp" ]
    }

    set_sources_assignment_filter(sources_assignment_filter)
  }

  if (is_ios) {
    set_sources_assignment_filter([])

    sources += [
      "//third_party/skia/src/utils/mac/SkCreateCGImageRef.cpp",
      "//third_party/skia/src/utils/mac/SkStream_mac.cpp",
    ]

    set_sources_assignment_filter(sources_assignment_filter)
  }

  # Fixup skia library sources.
  if (!is_android) {
    sources -= [
      "//third_party/skia/src/ports/SkFontMgr_android.cpp",
      "//third_party/skia/src/ports/SkFontMgr_android_factory.cpp",
      "//third_party/skia/src/ports/SkFontMgr_android_parser.cpp",
    ]
  }
  if (!is_mac && !is_ios) {
    sources -= [ "//third_party/skia/src/ports/SkFontHost_mac.cpp" ]
  }

  # On "Linux" (i.e., not Android), we use our a custom SkFontMgr.
  # TODO(vtl): We should probably do the same on Android.
  if (is_linux || is_nacl) {
    sources += [
      "//third_party/skia/src/ports/SkFontMgr_custom.cpp",
      "ports/font_mgr_factory.cc",
    ]
  }

  if (!is_linux && !is_android && !is_nacl) {
    sources -= [
      "//third_party/skia/src/ports/SkFontHost_FreeType.cpp",
      "//third_party/skia/src/ports/SkFontHost_FreeType_common.cpp",
    ]
  }

  if (is_clang) {
    # Skia won't compile with some of the more strict clang warnings.
    # e.g. it does:
    #  SkASSERT(!"sk_out_of_memory");
    configs -= [ "//build/config/clang:extra_warnings" ]
  }

  configs -= [ "//build/config/compiler:chromium_code" ]
  configs += [
    ":skia_library_config",
    "//build/config/compiler:no_chromium_code",
  ]
  public_configs = [ ":skia_config" ]

  deps = [
    ":skia_opts",
    "//base",
    "//base/third_party/dynamic_annotations",
    "//third_party/zlib",
  ]

  if (is_linux || is_nacl) {
    deps += [
      "//third_party/freetype2",
      "//third_party/icu:icuuc",
    ]
  }

  if (is_android) {
    set_sources_assignment_filter([])
    set_sources_assignment_filter(sources_assignment_filter)
    deps += [
      "//third_party/android_tools:cpu_features",
      "//third_party/expat",
      "//third_party/freetype-android:freetype",
    ]
  }

  if (is_android && !is_debug) {
    configs -= [ "//build/config/compiler:optimize" ]
    configs += [ "//build/config/compiler:optimize_max" ]
  }
}

# Separated out so it can be compiled with different flags for SSE.
source_set("skia_opts") {
  cflags = []
  defines = []

  if (current_cpu == "x86" || current_cpu == "x64") {
    if (!is_ios) {
      sources = gypi_skia_opts.sse2_sources + gypi_skia_opts.ssse3_sources +
                gypi_skia_opts.sse41_sources + gypi_skia_opts.avx_sources +
                [
                  # Chrome-specific.
                  "ext/convolver_SSE2.cc",
                  "ext/convolver_SSE2.h",
                ]

      cflags += [ "-msse4.1" ]
    } else {
      sources = gypi_skia_opts.none_sources
    }
  } else if (current_cpu == "arm") {
    # The assembly uses the frame pointer register (r7 in Thumb/r11 in
    # ARM), the compiler doesn't like that.
    cflags += [ "-fomit-frame-pointer" ]
    if (arm_version >= 7 && (arm_use_neon || arm_optionally_use_neon)) {
      sources = gypi_skia_opts.armv7_sources
      if (arm_use_neon || arm_optionally_use_neon) {
        sources += gypi_skia_opts.neon_sources

        # Root build config sets -mfpu=$arm_fpu, which we expect to be neon
        # when running this.
        if (!arm_use_neon) {
          configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
          cflags += [ "-mfpu=neon" ]
        }
      }
    } else {
      sources = gypi_skia_opts.none_sources
    }
  } else if (current_cpu == "arm64") {
    # TODO(1841): NEON sources are not currently used on arm64.
    sources = gypi_skia_opts.none_sources
  } else if (current_cpu == "mipsel") {
    cflags += [ "-fomit-frame-pointer" ]

    if (mips_dsp_rev >= 1) {
      sources = gypi_skia_opts.mips_dsp_sources
      if (mips_dsp_rev >= 2) {
        sources += [
          # Chrome-specific.
          "ext/convolver_mips_dspr2.cc",
          "ext/convolver_mips_dspr2.h",
        ]
      }
    } else {
      sources = gypi_skia_opts.none_sources
    }
  } else {
    assert(false, "Need to port cpu specific stuff from skia_library_opts.gyp")
  }

  if (is_android && !is_debug) {
    configs -= [ "//build/config/compiler:optimize" ]
    configs += [ "//build/config/compiler:optimize_max" ]
  }

  configs -= [ "//build/config/compiler:chromium_code" ]
  configs += [
    ":skia_config",
    ":skia_library_config",
    "//build/config/compiler:no_chromium_code",
  ]

  deps = [
    "//base",
  ]

  visibility = [ ":skia" ]
}