command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 5cc28ddc0a4912ad64922fe19a42a5e3f7451b2c..5dcc9dd3844c32e51eb7b6c1b1fd240c5bebb135 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -255,6 +255,11 @@ IdHandlerInterface* GLES2Implementation::GetIdHandler(int namespace_id) const {
   return share_group_->GetIdHandler(namespace_id);
 }
 
+RangeIdHandlerInterface* GLES2Implementation::GetRangeIdHandler(
+    int namespace_id) const {
+  return share_group_->GetRangeIdHandler(namespace_id);
+}
+
 IdAllocator* GLES2Implementation::GetIdAllocator(int namespace_id) const {
   if (namespace_id == id_namespaces::kQueries)
     return query_id_allocator_.get();
@@ -5824,6 +5829,164 @@ void GLES2Implementation::GetInternalformativ(
   CheckGLError();
 }
 
+GLuint GLES2Implementation::GenPathsCHROMIUM(GLsizei range) {
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glGenPathsCHROMIUM(" << range
+                     << ")");
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  static const char kFunctionName[] = "glGenPathsCHROMIUM";
+  if (range < 0) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "range < 0");
+    return 0;
+  }
+  if (!base::IsValueInRangeForNumericType<int32_t>(range)) {
+    SetGLError(GL_INVALID_OPERATION, kFunctionName, "range more than 32-bit");
+    return 0;
+  }
+  if (range == 0)
+    return 0;
+
+  GLuint first_client_id = 0;
+  GetRangeIdHandler(id_namespaces::kPaths)
+      ->MakeIdRange(this, range, &first_client_id);
+
+  if (first_client_id == 0) {
+    // Ran out of id space. Is not specified to raise any gl errors.
+    return 0;
+  }
+
+  helper_->GenPathsCHROMIUM(first_client_id, range);
+
+  GPU_CLIENT_LOG_CODE_BLOCK({
+    for (GLsizei i = 0; i < range; ++i) {
+      GPU_CLIENT_LOG("  " << i << ": " << (first_client_id + i));
+    }
+  });
+  CheckGLError();
+  return first_client_id;
+}
+
+void GLES2Implementation::DeletePathsCHROMIUM(GLuint first_client_id,
+                                              GLsizei range) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glDeletePathsCHROMIUM("
+                     << first_client_id << ", " << range << ")");
+  static const char kFunctionName[] = "glDeletePathsCHROMIUM";
+
+  if (range < 0) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "range < 0");
+    return;
+  }
+  if (!base::IsValueInRangeForNumericType<int32_t>(range)) {
+    SetGLError(GL_INVALID_OPERATION, kFunctionName, "range more than 32-bit");
+    return;
+  }
+  if (range == 0)
+    return;
+
+  GLuint last_client_id;
+  if (!SafeAddUint32(first_client_id, range - 1, &last_client_id)) {
+    SetGLError(GL_INVALID_OPERATION, kFunctionName, "overflow");
+    return;
+  }
+
+  GetRangeIdHandler(id_namespaces::kPaths)
+      ->FreeIdRange(this, first_client_id, range,
+                    &GLES2Implementation::DeletePathsCHROMIUMStub);
+  CheckGLError();
+}
+
+void GLES2Implementation::DeletePathsCHROMIUMStub(GLuint first_client_id,
+                                                  GLsizei range) {
+  helper_->DeletePathsCHROMIUM(first_client_id, range);
+}
+
+void GLES2Implementation::PathCommandsCHROMIUM(GLuint path,
+                                               GLsizei num_commands,
+                                               const GLubyte* commands,
+                                               GLsizei num_coords,
+                                               GLenum coord_type,
+                                               const void* coords) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glPathCommandsCHROMIUM(" << path
+                     << ", " << num_commands << ", " << commands << ", "
+                     << num_coords << ", " << coords << ")");
+  static const char kFunctionName[] = "glPathCommandsCHROMIUM";
+  if (path == 0) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "invalid path object");
+    return;
+  }
+  if (num_commands < 0) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "numCommands < 0");
+    return;
+  }
+  if (num_commands != 0 && !commands) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "missing commands");
+    return;
+  }
+  if (num_coords < 0) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "numCoords < 0");
+    return;
+  }
+  if (num_coords != 0 && !coords) {
+    SetGLError(GL_INVALID_VALUE, kFunctionName, "missing coords");
+    return;
+  }
+  uint32 coord_type_size = GLES2Util::GetGLTypeSizeForPathCoordType(coord_type);
+  if (coord_type_size == 0) {
+    SetGLError(GL_INVALID_ENUM, kFunctionName, "invalid coordType");
+    return;
+  }
+  if (num_commands == 0) {
+    // No commands must mean no coords, thus nothing to memcpy. Let
+    // the service validate the call. Validate coord_type above, so
+    // that the parameters will be checked the in the same order
+    // regardless of num_commands.
+    helper_->PathCommandsCHROMIUM(path, num_commands, 0, 0, num_coords,
+                                  coord_type, 0, 0);
+    CheckGLError();
+    return;
+  }
+
+  uint32 coords_size;
+  if (!SafeMultiplyUint32(num_coords, coord_type_size, &coords_size)) {
+    SetGLError(GL_INVALID_OPERATION, kFunctionName, "overflow");
+    return;
+  }
+
+  uint32 required_buffer_size;
+  if (!SafeAddUint32(coords_size, num_commands, &required_buffer_size)) {
+    SetGLError(GL_INVALID_OPERATION, kFunctionName, "overflow");
+    return;
+  }
+
+  ScopedTransferBufferPtr buffer(required_buffer_size, helper_,
+                                 transfer_buffer_);
+  if (!buffer.valid() || buffer.size() < required_buffer_size) {
+    SetGLError(GL_OUT_OF_MEMORY, kFunctionName, "too large");
+    return;
+  }
+
+  uint32 coords_shm_id = 0;
+  uint32 coords_shm_offset = 0;
+  // Copy coords first because they need more strict alignment.
+  if (coords_size > 0) {
+    unsigned char* coords_addr = static_cast<unsigned char*>(buffer.address());
+    memcpy(coords_addr, coords, coords_size);
+    coords_shm_id = buffer.shm_id();
+    coords_shm_offset = buffer.offset();
+  }
+
+  DCHECK(num_commands > 0);
+  unsigned char* commands_addr =
+      static_cast<unsigned char*>(buffer.address()) + coords_size;
+  memcpy(commands_addr, commands, num_commands);
+
+  helper_->PathCommandsCHROMIUM(path, num_commands, buffer.shm_id(),
+                                buffer.offset() + coords_size, num_coords,
+                                coord_type, coords_shm_id, coords_shm_offset);
+  CheckGLError();
+}
+
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.