Add SkBitmap StructTraits for skia::mojo::Bitmap.

skia/public/interfaces/bitmap_skbitmap_struct_traits.cc

Index: skia/public/interfaces/bitmap_skbitmap_struct_traits.cc
diff --git a/skia/public/interfaces/bitmap_skbitmap_struct_traits.cc b/skia/public/interfaces/bitmap_skbitmap_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7d19bb6715d2cac0d268ae8e3139f16727659060
--- /dev/null
+++ b/skia/public/interfaces/bitmap_skbitmap_struct_traits.cc
@@ -0,0 +1,242 @@
+// 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::INDEX_8:
+      return kIndex_8_SkColorType;
+    case skia::mojom::ColorType::GRAY_8:
+      return kGray_8_SkColorType;
+  }
+  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;
+}
+
+SkColorProfileType MojoProfileTypeToSk(skia::mojom::ColorProfileType type) {
+  switch (type) {
+    case skia::mojom::ColorProfileType::LINEAR:
+      return kLinear_SkColorProfileType;
+    case skia::mojom::ColorProfileType::SRGB:
+      return kSRGB_SkColorProfileType;
+  }
+  NOTREACHED();
+  return kLinear_SkColorProfileType;
+}
+
+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 kIndex_8_SkColorType:
+      return skia::mojom::ColorType::INDEX_8;
+    case kGray_8_SkColorType:
+      return skia::mojom::ColorType::GRAY_8;
+    case kRGBA_F16_SkColorType:
+      NOTREACHED();
+      return skia::mojom::ColorType::UNKNOWN;
+  }
+  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 SkProfileTypeToMojo(SkColorProfileType type) {
+  switch (type) {
+    case kLinear_SkColorProfileType:
+      return skia::mojom::ColorProfileType::LINEAR;
+    case kSRGB_SkColorProfileType:
+      return skia::mojom::ColorProfileType::SRGB;
+  }
+  NOTREACHED();
+  return skia::mojom::ColorProfileType::LINEAR;
+}
+
+}  // namespace
+
+// static
+size_t ArrayTraits<BitmapBuffer>::GetSize(const BitmapBuffer& b) {
+  return b.size;
+}
+
+// static
+uint8_t* ArrayTraits<BitmapBuffer>::GetData(BitmapBuffer& b) {
+  return b.data;
+}
+
+// static
+const uint8_t* ArrayTraits<BitmapBuffer>::GetData(const BitmapBuffer& b) {
+  return b.data;
+}
+
+// static
+uint8_t& ArrayTraits<BitmapBuffer>::GetAt(BitmapBuffer& b, size_t i) {
+  return *(b.data + i);
+}
+
+// static
+const uint8_t& ArrayTraits<BitmapBuffer>::GetAt(const BitmapBuffer& b,
+                                                size_t i) {
+  return *(b.data + i);
+}
+
+// static
+void ArrayTraits<BitmapBuffer>::Resize(BitmapBuffer& b, size_t size) {
+  CHECK_EQ(size, b.size);
+}
+
+// static
+bool StructTraits<skia::mojom::Bitmap, SkBitmap>::IsNull(const SkBitmap& b) {
+  return b.isNull();
+}
+
+// static
+void StructTraits<skia::mojom::Bitmap, SkBitmap>::SetToNull(SkBitmap* b) {
+  b->reset();
+}
+
+// static
+skia::mojom::ColorType StructTraits<skia::mojom::Bitmap, SkBitmap>::color_type(
+    const SkBitmap& b) {
+  return SkColorTypeToMojo(b.colorType());
+}
+
+// static
+skia::mojom::AlphaType StructTraits<skia::mojom::Bitmap, SkBitmap>::alpha_type(
+    const SkBitmap& b) {
+  return SkAlphaTypeToMojo(b.alphaType());
+}
+
+// static
+skia::mojom::ColorProfileType
+StructTraits<skia::mojom::Bitmap, SkBitmap>::profile_type(const SkBitmap& b) {
+  return SkProfileTypeToMojo(b.profileType());
+}
+
+// static
+uint32_t StructTraits<skia::mojom::Bitmap, SkBitmap>::width(const SkBitmap& b) {
+  return b.width() < 0 ? 0 : static_cast<uint32_t>(b.width());
+}
+
+// static
+uint32_t StructTraits<skia::mojom::Bitmap, SkBitmap>::height(
+    const SkBitmap& b) {
+  return b.height() < 0 ? 0 : static_cast<uint32_t>(b.height());
+}
+
+// static
+BitmapBuffer StructTraits<skia::mojom::Bitmap, SkBitmap>::pixel_data(
+    const SkBitmap& b) {
+  BitmapBuffer bitmap_buffer;
+  bitmap_buffer.data = static_cast<uint8_t*>(b.getPixels());
+  bitmap_buffer.size = b.getSize();
+  return bitmap_buffer;
+}
+
+// static
+bool StructTraits<skia::mojom::Bitmap, 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())))) {
+    return false;
+  }
+
+  // If the image is empty, return success after setting the image info.
+  if (data.width() == 0 || data.height() == 0)
+    return true;
+
+  SkAutoPixmapUnlock pixmap;
+  if (static_cast<uint32_t>(b->width()) != data.width() ||
+      static_cast<uint32_t>(b->height()) != data.height() ||
+      !b->requestLock(&pixmap) || !b->lockPixelsAreWritable() ||
+      !b->readyToDraw()) {
+    return false;
+  }
+
+  BitmapBuffer bitmap_buffer;
+  bitmap_buffer.data = static_cast<uint8_t*>(b->getPixels());
+  bitmap_buffer.size = b->getSize();
+  if (!data.ReadPixelData(&bitmap_buffer))
+    return false;
+
+  b->notifyPixelsChanged();
+  return true;
+}
+
+// static
+void* StructTraits<skia::mojom::Bitmap, SkBitmap>::SetUpContext(
+    const SkBitmap& b) {
+  b.lockPixels();
+  return nullptr;
+}
+
+// static
+void StructTraits<skia::mojom::Bitmap, SkBitmap>::TearDownContext(
+    const SkBitmap& b,
+    void* context) {
+  b.unlockPixels();
+}
+
+}  // namespace mojo