display_list/dl_vertices.cc - mirrors/engine - Git at Google

 // 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.

 #include "flutter/display_list/dl_vertices.h"

 #include "flutter/display_list/utils/dl_bounds_accumulator.h"
 #include "flutter/fml/logging.h"

 namespace flutter {

 using Flags = DlVertices::Builder::Flags;

 static void DlVerticesDeleter(void* p) {
   // Some of our target environments would prefer a sized delete,
   // but other target environments do not have that operator.
   // Use an unsized delete until we get better agreement in the
   // environments.
   // See https://github.com/flutter/flutter/issues/100327
   ::operator delete(p);
 }

 static size_t bytes_needed(int vertex_count, Flags flags, int index_count) {
   int needed = sizeof(DlVertices);
   // We always have vertices
   needed += vertex_count * sizeof(SkPoint);
   if (flags.has_texture_coordinates) {
     needed += vertex_count * sizeof(SkPoint);
   }
   if (flags.has_colors) {
     needed += vertex_count * sizeof(DlColor);
   }
   if (index_count > 0) {
     needed += index_count * sizeof(uint16_t);
   }
   return needed;
 }

 std::shared_ptr<DlVertices> DlVertices::Make(
     DlVertexMode mode,
     int vertex_count,
     const SkPoint vertices[],
     const SkPoint texture_coordinates[],
     const DlColor colors[],
     int index_count,
     const uint16_t indices[]) {
   if (!vertices || vertex_count <= 0) {
     vertex_count = 0;
     texture_coordinates = nullptr;
     colors = nullptr;
   }
   if (!indices || index_count <= 0) {
     index_count = 0;
     indices = nullptr;
   }

   Flags flags;
   FML_DCHECK(!flags.has_texture_coordinates);
   FML_DCHECK(!flags.has_colors);
   if (texture_coordinates) {
     flags |= Builder::kHasTextureCoordinates;
   }
   if (colors) {
     flags |= Builder::kHasColors;
   }
   Builder builder(mode, vertex_count, flags, index_count);

   builder.store_vertices(vertices);
   if (texture_coordinates) {
     builder.store_texture_coordinates(texture_coordinates);
   }
   if (colors) {
     builder.store_colors(colors);
   }
   if (indices) {
     builder.store_indices(indices);
   }

   return builder.build();
 }

 size_t DlVertices::size() const {
   return bytes_needed(vertex_count_,
                       {{texture_coordinates_offset_ > 0, colors_offset_ > 0}},
                       index_count_);
 }

 static SkRect compute_bounds(const SkPoint* points, int count) {
   RectBoundsAccumulator accumulator;
   for (int i = 0; i < count; i++) {
     accumulator.accumulate(points[i]);
   }
   return accumulator.bounds();
 }

 DlVertices::DlVertices(DlVertexMode mode,
                        int unchecked_vertex_count,
                        const SkPoint* vertices,
                        const SkPoint* texture_coordinates,
                        const DlColor* colors,
                        int unchecked_index_count,
                        const uint16_t* indices,
                        const SkRect* bounds)
     : mode_(mode),
       vertex_count_(std::max(unchecked_vertex_count, 0)),
       index_count_(indices ? std::max(unchecked_index_count, 0) : 0) {
   bounds_ = bounds ? *bounds : compute_bounds(vertices, vertex_count_);

   char* pod = reinterpret_cast<char*>(this);
   size_t offset = sizeof(DlVertices);

   auto advance = [pod, &offset](auto* src, int count) {
     if (src != nullptr && count > 0) {
       size_t bytes = count * sizeof(*src);
       memcpy(pod + offset, src, bytes);
       size_t ret = offset;
       offset += bytes;
       return ret;
     } else {
       return static_cast<size_t>(0);
     }
   };

   vertices_offset_ = advance(vertices, vertex_count_);
   texture_coordinates_offset_ = advance(texture_coordinates, vertex_count_);
   colors_offset_ = advance(colors, vertex_count_);
   indices_offset_ = advance(indices, index_count_);
   FML_DCHECK(offset == bytes_needed(vertex_count_,
                                     {{!!texture_coordinates, !!colors}},
                                     index_count_));
 }

 DlVertices::DlVertices(const DlVertices* other)
     : DlVertices(other->mode_,
                  other->vertex_count_,
                  other->vertices(),
                  other->texture_coordinates(),
                  other->colors(),
                  other->index_count_,
                  other->indices(),
                  &other->bounds_) {}

 DlVertices::DlVertices(DlVertexMode mode,
                        int unchecked_vertex_count,
                        Flags flags,
                        int unchecked_index_count)
     : mode_(mode),
       vertex_count_(std::max(unchecked_vertex_count, 0)),
       index_count_(std::max(unchecked_index_count, 0)) {
   char* pod = reinterpret_cast<char*>(this);
   size_t offset = sizeof(DlVertices);

   auto advance = [pod, &offset](size_t size, int count) {
     if (count > 0) {
       size_t bytes = count * size;
       memset(pod + offset, 0, bytes);
       size_t ret = offset;
       offset += bytes;
       return ret;
     } else {
       return static_cast<size_t>(0);
     }
   };

   vertices_offset_ = advance(sizeof(SkPoint), vertex_count_);
   texture_coordinates_offset_ = advance(
       sizeof(SkPoint), flags.has_texture_coordinates ? vertex_count_ : 0);
   colors_offset_ =
       advance(sizeof(DlColor), flags.has_colors ? vertex_count_ : 0);
   indices_offset_ = advance(sizeof(uint16_t), index_count_);
   FML_DCHECK(offset == bytes_needed(vertex_count_, flags, index_count_));
   FML_DCHECK((vertex_count_ != 0) == (vertices() != nullptr));
   FML_DCHECK((vertex_count_ != 0 && flags.has_texture_coordinates) ==
              (texture_coordinates() != nullptr));
   FML_DCHECK((vertex_count_ != 0 && flags.has_colors) == (colors() != nullptr));
   FML_DCHECK((index_count_ != 0) == (indices() != nullptr));
 }

 bool DlVertices::operator==(DlVertices const& other) const {
   auto lists_equal = [](auto* a, auto* b, int count) {
     if (a == nullptr || b == nullptr) {
       return a == b;
     }
     for (int i = 0; i < count; i++) {
       if (a[i] != b[i]) {
         return false;
       }
     }
     return true;
   };
   return                                                               //
       mode_ == other.mode_ &&                                          //
       vertex_count_ == other.vertex_count_ &&                          //
       lists_equal(vertices(), other.vertices(), vertex_count_) &&      //
       lists_equal(texture_coordinates(), other.texture_coordinates(),  //
                   vertex_count_) &&                                    //
       lists_equal(colors(), other.colors(), vertex_count_) &&          //
       index_count_ == other.index_count_ &&                            //
       lists_equal(indices(), other.indices(), index_count_);
 }

 DlVertices::Builder::Builder(DlVertexMode mode,
                              int vertex_count,
                              Flags flags,
                              int index_count)
     : needs_texture_coords_(flags.has_texture_coordinates),
       needs_colors_(flags.has_colors),
       needs_indices_(index_count > 0) {
   vertex_count = std::max(vertex_count, 0);
   index_count = std::max(index_count, 0);
   void* storage =
       ::operator new(bytes_needed(vertex_count, flags, index_count));
   vertices_.reset(new (storage)
                       DlVertices(mode, vertex_count, flags, index_count),
                   DlVerticesDeleter);
 }

 static void store_points(char* dst, int offset, const float* src, int count) {
   SkPoint* points = reinterpret_cast<SkPoint*>(dst + offset);
   for (int i = 0; i < count; i++) {
     points[i] = SkPoint::Make(src[i * 2], src[i * 2 + 1]);
   }
 }

 void DlVertices::Builder::store_vertices(const SkPoint vertices[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_vertices_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   size_t bytes = vertices_->vertex_count_ * sizeof(vertices[0]);
   memcpy(pod + vertices_->vertices_offset_, vertices, bytes);
   needs_vertices_ = false;
 }

 void DlVertices::Builder::store_vertices(const float vertices[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_vertices_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   store_points(pod, vertices_->vertices_offset_, vertices,
                vertices_->vertex_count_);
   needs_vertices_ = false;
 }

 void DlVertices::Builder::store_texture_coordinates(const SkPoint coords[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_texture_coords_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   size_t bytes = vertices_->vertex_count_ * sizeof(coords[0]);
   memcpy(pod + vertices_->texture_coordinates_offset_, coords, bytes);
   needs_texture_coords_ = false;
 }

 void DlVertices::Builder::store_texture_coordinates(const float coords[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_texture_coords_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   store_points(pod, vertices_->texture_coordinates_offset_, coords,
                vertices_->vertex_count_);
   needs_texture_coords_ = false;
 }

 void DlVertices::Builder::store_colors(const DlColor colors[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_colors_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   size_t bytes = vertices_->vertex_count_ * sizeof(colors[0]);
   memcpy(pod + vertices_->colors_offset_, colors, bytes);
   needs_colors_ = false;
 }

 void DlVertices::Builder::store_indices(const uint16_t indices[]) {
   FML_CHECK(is_valid());
   FML_CHECK(needs_indices_);
   char* pod = reinterpret_cast<char*>(vertices_.get());
   size_t bytes = vertices_->index_count_ * sizeof(indices[0]);
   memcpy(pod + vertices_->indices_offset_, indices, bytes);
   needs_indices_ = false;
 }

 std::shared_ptr<DlVertices> DlVertices::Builder::build() {
   FML_CHECK(is_valid());
   if (vertices_->vertex_count() <= 0) {
     // We set this to true in the constructor to make sure that they
     // call store_vertices() only once, but if there are no vertices
     // then we will not object to them never having stored any vertices
     needs_vertices_ = false;
   }
   FML_CHECK(!needs_vertices_);
   FML_CHECK(!needs_texture_coords_);
   FML_CHECK(!needs_colors_);
   FML_CHECK(!needs_indices_);

   vertices_->bounds_ =
       compute_bounds(vertices_->vertices(), vertices_->vertex_count_);

   return std::move(vertices_);
 }

 }  // namespace flutter
	// 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.

	#include "flutter/display_list/dl_vertices.h"

	#include "flutter/display_list/utils/dl_bounds_accumulator.h"
	#include "flutter/fml/logging.h"

	namespace flutter {

	using Flags = DlVertices::Builder::Flags;

	static void DlVerticesDeleter(void* p) {
	// Some of our target environments would prefer a sized delete,
	// but other target environments do not have that operator.
	// Use an unsized delete until we get better agreement in the
	// environments.
	// See https://github.com/flutter/flutter/issues/100327
	::operator delete(p);
	}

	static size_t bytes_needed(int vertex_count, Flags flags, int index_count) {
	int needed = sizeof(DlVertices);
	// We always have vertices
	needed += vertex_count * sizeof(SkPoint);
	if (flags.has_texture_coordinates) {
	needed += vertex_count * sizeof(SkPoint);
	}
	if (flags.has_colors) {
	needed += vertex_count * sizeof(DlColor);
	}
	if (index_count > 0) {
	needed += index_count * sizeof(uint16_t);
	}
	return needed;
	}

	std::shared_ptr<DlVertices> DlVertices::Make(
	DlVertexMode mode,
	int vertex_count,
	const SkPoint vertices[],
	const SkPoint texture_coordinates[],
	const DlColor colors[],
	int index_count,
	const uint16_t indices[]) {
	if (!vertices \|\| vertex_count <= 0) {
	vertex_count = 0;
	texture_coordinates = nullptr;
	colors = nullptr;
	}
	if (!indices \|\| index_count <= 0) {
	index_count = 0;
	indices = nullptr;
	}

	Flags flags;
	FML_DCHECK(!flags.has_texture_coordinates);
	FML_DCHECK(!flags.has_colors);
	if (texture_coordinates) {
	flags \|= Builder::kHasTextureCoordinates;
	}
	if (colors) {
	flags \|= Builder::kHasColors;
	}
	Builder builder(mode, vertex_count, flags, index_count);

	builder.store_vertices(vertices);
	if (texture_coordinates) {
	builder.store_texture_coordinates(texture_coordinates);
	}
	if (colors) {
	builder.store_colors(colors);
	}
	if (indices) {
	builder.store_indices(indices);
	}

	return builder.build();
	}

	size_t DlVertices::size() const {
	return bytes_needed(vertex_count_,
	{{texture_coordinates_offset_ > 0, colors_offset_ > 0}},
	index_count_);
	}

	static SkRect compute_bounds(const SkPoint* points, int count) {
	RectBoundsAccumulator accumulator;
	for (int i = 0; i < count; i++) {
	accumulator.accumulate(points[i]);
	}
	return accumulator.bounds();
	}

	DlVertices::DlVertices(DlVertexMode mode,
	int unchecked_vertex_count,
	const SkPoint* vertices,
	const SkPoint* texture_coordinates,
	const DlColor* colors,
	int unchecked_index_count,
	const uint16_t* indices,
	const SkRect* bounds)
	: mode_(mode),
	vertex_count_(std::max(unchecked_vertex_count, 0)),
	index_count_(indices ? std::max(unchecked_index_count, 0) : 0) {
	bounds_ = bounds ? *bounds : compute_bounds(vertices, vertex_count_);

	char* pod = reinterpret_cast<char*>(this);
	size_t offset = sizeof(DlVertices);

	auto advance = [pod, &offset](auto* src, int count) {
	if (src != nullptr && count > 0) {
	size_t bytes = count * sizeof(*src);
	memcpy(pod + offset, src, bytes);
	size_t ret = offset;
	offset += bytes;
	return ret;
	} else {
	return static_cast<size_t>(0);
	}
	};

	vertices_offset_ = advance(vertices, vertex_count_);
	texture_coordinates_offset_ = advance(texture_coordinates, vertex_count_);
	colors_offset_ = advance(colors, vertex_count_);
	indices_offset_ = advance(indices, index_count_);
	FML_DCHECK(offset == bytes_needed(vertex_count_,
	{{!!texture_coordinates, !!colors}},
	index_count_));
	}

	DlVertices::DlVertices(const DlVertices* other)
	: DlVertices(other->mode_,
	other->vertex_count_,
	other->vertices(),
	other->texture_coordinates(),
	other->colors(),
	other->index_count_,
	other->indices(),
	&other->bounds_) {}

	DlVertices::DlVertices(DlVertexMode mode,
	int unchecked_vertex_count,
	Flags flags,
	int unchecked_index_count)
	: mode_(mode),
	vertex_count_(std::max(unchecked_vertex_count, 0)),
	index_count_(std::max(unchecked_index_count, 0)) {
	char* pod = reinterpret_cast<char*>(this);
	size_t offset = sizeof(DlVertices);

	auto advance = [pod, &offset](size_t size, int count) {
	if (count > 0) {
	size_t bytes = count * size;
	memset(pod + offset, 0, bytes);
	size_t ret = offset;
	offset += bytes;
	return ret;
	} else {
	return static_cast<size_t>(0);
	}
	};

	vertices_offset_ = advance(sizeof(SkPoint), vertex_count_);
	texture_coordinates_offset_ = advance(
	sizeof(SkPoint), flags.has_texture_coordinates ? vertex_count_ : 0);
	colors_offset_ =
	advance(sizeof(DlColor), flags.has_colors ? vertex_count_ : 0);
	indices_offset_ = advance(sizeof(uint16_t), index_count_);
	FML_DCHECK(offset == bytes_needed(vertex_count_, flags, index_count_));
	FML_DCHECK((vertex_count_ != 0) == (vertices() != nullptr));
	FML_DCHECK((vertex_count_ != 0 && flags.has_texture_coordinates) ==
	(texture_coordinates() != nullptr));
	FML_DCHECK((vertex_count_ != 0 && flags.has_colors) == (colors() != nullptr));
	FML_DCHECK((index_count_ != 0) == (indices() != nullptr));
	}

	bool DlVertices::operator==(DlVertices const& other) const {
	auto lists_equal = [](auto* a, auto* b, int count) {
	if (a == nullptr \|\| b == nullptr) {
	return a == b;
	}
	for (int i = 0; i < count; i++) {
	if (a[i] != b[i]) {
	return false;
	}
	}
	return true;
	};
	return //
	mode_ == other.mode_ && //
	vertex_count_ == other.vertex_count_ && //
	lists_equal(vertices(), other.vertices(), vertex_count_) && //
	lists_equal(texture_coordinates(), other.texture_coordinates(), //
	vertex_count_) && //
	lists_equal(colors(), other.colors(), vertex_count_) && //
	index_count_ == other.index_count_ && //
	lists_equal(indices(), other.indices(), index_count_);
	}

	DlVertices::Builder::Builder(DlVertexMode mode,
	int vertex_count,
	Flags flags,
	int index_count)
	: needs_texture_coords_(flags.has_texture_coordinates),
	needs_colors_(flags.has_colors),
	needs_indices_(index_count > 0) {
	vertex_count = std::max(vertex_count, 0);
	index_count = std::max(index_count, 0);
	void* storage =
	::operator new(bytes_needed(vertex_count, flags, index_count));
	vertices_.reset(new (storage)
	DlVertices(mode, vertex_count, flags, index_count),
	DlVerticesDeleter);
	}

	static void store_points(char* dst, int offset, const float* src, int count) {
	SkPoint* points = reinterpret_cast<SkPoint*>(dst + offset);
	for (int i = 0; i < count; i++) {
	points[i] = SkPoint::Make(src[i * 2], src[i * 2 + 1]);
	}
	}

	void DlVertices::Builder::store_vertices(const SkPoint vertices[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_vertices_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	size_t bytes = vertices_->vertex_count_ * sizeof(vertices[0]);
	memcpy(pod + vertices_->vertices_offset_, vertices, bytes);
	needs_vertices_ = false;
	}

	void DlVertices::Builder::store_vertices(const float vertices[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_vertices_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	store_points(pod, vertices_->vertices_offset_, vertices,
	vertices_->vertex_count_);
	needs_vertices_ = false;
	}

	void DlVertices::Builder::store_texture_coordinates(const SkPoint coords[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_texture_coords_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	size_t bytes = vertices_->vertex_count_ * sizeof(coords[0]);
	memcpy(pod + vertices_->texture_coordinates_offset_, coords, bytes);
	needs_texture_coords_ = false;
	}

	void DlVertices::Builder::store_texture_coordinates(const float coords[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_texture_coords_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	store_points(pod, vertices_->texture_coordinates_offset_, coords,
	vertices_->vertex_count_);
	needs_texture_coords_ = false;
	}

	void DlVertices::Builder::store_colors(const DlColor colors[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_colors_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	size_t bytes = vertices_->vertex_count_ * sizeof(colors[0]);
	memcpy(pod + vertices_->colors_offset_, colors, bytes);
	needs_colors_ = false;
	}

	void DlVertices::Builder::store_indices(const uint16_t indices[]) {
	FML_CHECK(is_valid());
	FML_CHECK(needs_indices_);
	char* pod = reinterpret_cast<char*>(vertices_.get());
	size_t bytes = vertices_->index_count_ * sizeof(indices[0]);
	memcpy(pod + vertices_->indices_offset_, indices, bytes);
	needs_indices_ = false;
	}

	std::shared_ptr<DlVertices> DlVertices::Builder::build() {
	FML_CHECK(is_valid());
	if (vertices_->vertex_count() <= 0) {
	// We set this to true in the constructor to make sure that they
	// call store_vertices() only once, but if there are no vertices
	// then we will not object to them never having stored any vertices
	needs_vertices_ = false;
	}
	FML_CHECK(!needs_vertices_);
	FML_CHECK(!needs_texture_coords_);
	FML_CHECK(!needs_colors_);
	FML_CHECK(!needs_indices_);

	vertices_->bounds_ =
	compute_bounds(vertices_->vertices(), vertices_->vertex_count_);

	return std::move(vertices_);
	}

	} // namespace flutter