bitmap_skbitmap_struct_traits.cc

// Copyright 2016 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/bitmap_skbitmap_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
bool StructTraits<skia::mojom::BitmapDataView, SkBitmap>::IsNull(
    const SkBitmap& b) {
  return b.isNull();
}

// static
void StructTraits<skia::mojom::BitmapDataView, SkBitmap>::SetToNull(
    SkBitmap* b) {
  b->reset();
}

// static
skia::mojom::ColorType StructTraits<skia::mojom::BitmapDataView,
                                    SkBitmap>::color_type(const SkBitmap& b) {
  return SkColorTypeToMojo(b.colorType());
}

// static
skia::mojom::AlphaType StructTraits<skia::mojom::BitmapDataView,
                                    SkBitmap>::alpha_type(const SkBitmap& b) {
  return SkAlphaTypeToMojo(b.alphaType());
}

// static
skia::mojom::ColorProfileType
StructTraits<skia::mojom::BitmapDataView, SkBitmap>::profile_type(
    const SkBitmap& b) {
  return SkColorSpaceToMojo(b.colorSpace());
}

// static
uint32_t StructTraits<skia::mojom::BitmapDataView, SkBitmap>::width(
    const SkBitmap& b) {
  return b.width() < 0 ? 0 : static_cast<uint32_t>(b.width());
}

// static
uint32_t StructTraits<skia::mojom::BitmapDataView, SkBitmap>::height(
    const SkBitmap& b) {
  return b.height() < 0 ? 0 : static_cast<uint32_t>(b.height());
}

// static
uint64_t StructTraits<skia::mojom::BitmapDataView, SkBitmap>::row_bytes(
    const SkBitmap& b) {
  return b.rowBytes();
}

// static
BitmapBuffer StructTraits<skia::mojom::BitmapDataView, SkBitmap>::pixel_data(
    const SkBitmap& b) {
  return BitmapBuffer(static_cast<uint8_t*>(b.getPixels()),
                      b.computeByteSize());
}

// static
bool StructTraits<skia::mojom::BitmapDataView, SkBitmap>::Read(
    skia::mojom::BitmapDataView data,
    SkBitmap* b) {
  // TODO: Ensure width and height are reasonable, eg. <= kMaxBitmapSize?
  *b = SkBitmap();
  if (!b->tryAllocPixels(
          SkImageInfo::Make(data.width(), data.height(),
                            MojoColorTypeToSk(data.color_type()),
                            MojoAlphaTypeToSk(data.alpha_type()),
                            MojoProfileTypeToSk(data.profile_type())),
          data.row_bytes())) {
    return false;
  }

  // If the image is empty, return success after setting the image info.
  if (data.width() == 0 || data.height() == 0)
    return true;

  mojo::ArrayDataView<uint8_t> data_view;
  data.GetPixelDataDataView(&data_view);
  if (static_cast<uint32_t>(b->width()) != data.width() ||
      static_cast<uint32_t>(b->height()) != data.height() ||
      static_cast<uint64_t>(b->rowBytes()) != data.row_bytes() ||
      b->computeByteSize() != data_view.size() || !b->readyToDraw()) {
    return false;
  }

  BitmapBuffer bitmap_buffer(static_cast<uint8_t*>(b->getPixels()),
                             b->computeByteSize());
  if (!data.ReadPixelData(&bitmap_buffer) ||
      bitmap_buffer.size() != b->computeByteSize())
    return false;

  b->notifyPixelsChanged();
  return true;
}

}  // namespace mojo