image_info_struct_traits.cc

// Copyright 2018 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.

#include "skia/public/interfaces/image_info_struct_traits.h"

namespace mojo {

namespace {

SkColorType MojoColorTypeToSk(skia::mojom::ColorType type) {
  switch (type) {
    case skia::mojom::ColorType::UNKNOWN:
      return kUnknown_SkColorType;
    case skia::mojom::ColorType::ALPHA_8:
      return kAlpha_8_SkColorType;
    case skia::mojom::ColorType::RGB_565:
      return kRGB_565_SkColorType;
    case skia::mojom::ColorType::ARGB_4444:
      return kARGB_4444_SkColorType;
    case skia::mojom::ColorType::RGBA_8888:
      return kRGBA_8888_SkColorType;
    case skia::mojom::ColorType::BGRA_8888:
      return kBGRA_8888_SkColorType;
    case skia::mojom::ColorType::GRAY_8:
      return kGray_8_SkColorType;
    case skia::mojom::ColorType::INDEX_8:
      // no longer supported
      break;
  }
  NOTREACHED();
  return kUnknown_SkColorType;
}

SkAlphaType MojoAlphaTypeToSk(skia::mojom::AlphaType type) {
  switch (type) {
    case skia::mojom::AlphaType::UNKNOWN:
      return kUnknown_SkAlphaType;
    case skia::mojom::AlphaType::ALPHA_TYPE_OPAQUE:
      return kOpaque_SkAlphaType;
    case skia::mojom::AlphaType::PREMUL:
      return kPremul_SkAlphaType;
    case skia::mojom::AlphaType::UNPREMUL:
      return kUnpremul_SkAlphaType;
  }
  NOTREACHED();
  return kUnknown_SkAlphaType;
}

sk_sp<SkColorSpace> MojoProfileTypeToSk(skia::mojom::ColorProfileType type) {
  switch (type) {
    case skia::mojom::ColorProfileType::LINEAR:
      return nullptr;
    case skia::mojom::ColorProfileType::SRGB:
      return SkColorSpace::MakeSRGB();
  }
  NOTREACHED();
  return nullptr;
}

skia::mojom::ColorType SkColorTypeToMojo(SkColorType type) {
  switch (type) {
    case kUnknown_SkColorType:
      return skia::mojom::ColorType::UNKNOWN;
    case kAlpha_8_SkColorType:
      return skia::mojom::ColorType::ALPHA_8;
    case kRGB_565_SkColorType:
      return skia::mojom::ColorType::RGB_565;
    case kARGB_4444_SkColorType:
      return skia::mojom::ColorType::ARGB_4444;
    case kRGBA_8888_SkColorType:
      return skia::mojom::ColorType::RGBA_8888;
    case kBGRA_8888_SkColorType:
      return skia::mojom::ColorType::BGRA_8888;
    case kGray_8_SkColorType:
      return skia::mojom::ColorType::GRAY_8;
    default:
      // Skia has color types not used by Chrome.
      break;
  }
  NOTREACHED();
  return skia::mojom::ColorType::UNKNOWN;
}

skia::mojom::AlphaType SkAlphaTypeToMojo(SkAlphaType type) {
  switch (type) {
    case kUnknown_SkAlphaType:
      return skia::mojom::AlphaType::UNKNOWN;
    case kOpaque_SkAlphaType:
      return skia::mojom::AlphaType::ALPHA_TYPE_OPAQUE;
    case kPremul_SkAlphaType:
      return skia::mojom::AlphaType::PREMUL;
    case kUnpremul_SkAlphaType:
      return skia::mojom::AlphaType::UNPREMUL;
  }
  NOTREACHED();
  return skia::mojom::AlphaType::UNKNOWN;
}

skia::mojom::ColorProfileType SkColorSpaceToMojo(SkColorSpace* cs) {
  if (cs && cs->gammaCloseToSRGB())
    return skia::mojom::ColorProfileType::SRGB;
  return skia::mojom::ColorProfileType::LINEAR;
}

}  // namespace

// static
skia::mojom::ColorType
StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::color_type(
    const SkImageInfo& info) {
  return SkColorTypeToMojo(info.colorType());
}

// static
skia::mojom::AlphaType
StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::alpha_type(
    const SkImageInfo& info) {
  return SkAlphaTypeToMojo(info.alphaType());
}

// static
skia::mojom::ColorProfileType
StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::profile_type(
    const SkImageInfo& info) {
  return SkColorSpaceToMojo(info.colorSpace());
}

// static
uint32_t StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::width(
    const SkImageInfo& info) {
  return info.width() < 0 ? 0 : static_cast<uint32_t>(info.width());
}

// static
uint32_t StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::height(
    const SkImageInfo& info) {
  return info.height() < 0 ? 0 : static_cast<uint32_t>(info.height());
}

// static
bool StructTraits<skia::mojom::ImageInfoDataView, SkImageInfo>::Read(
    skia::mojom::ImageInfoDataView data,
    SkImageInfo* info) {
  *info = SkImageInfo::Make(data.width(), data.height(),
                            MojoColorTypeToSk(data.color_type()),
                            MojoAlphaTypeToSk(data.alpha_type()),
                            MojoProfileTypeToSk(data.profile_type()));
  return true;
}

}  // namespace mojo