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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef PUBLIC_FPDF_STRUCTTREE_H_
#define PUBLIC_FPDF_STRUCTTREE_H_
// NOLINTNEXTLINE(build/include)
#include "fpdfview.h"
#ifdef __cplusplus
extern "C" {
#endif
// Function: FPDF_StructTree_GetForPage
// Get the structure tree for a page.
// Parameters:
// page - Handle to the page. Returned by FPDF_LoadPage
// function.
// Return value:
// A handle to the structure tree or NULL on error.
DLLEXPORT FPDF_STRUCTTREE STDCALL FPDF_StructTree_GetForPage(FPDF_PAGE page);
// Function: FPDF_StructTree_Close
// Release the resource allocate by FPDF_StructTree_GetForPage.
// Parameters:
// struct_tree - Handle to the struct tree. Returned by
// FPDF_StructTree_LoadPage function.
// Return value:
// NULL
DLLEXPORT void STDCALL FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree);
// Function: FPDF_StructTree_CountChildren
// Count the number of children for the structure tree.
// Parameters:
// struct_tree - Handle to the struct tree. Returned by
// FPDF_StructTree_LoadPage function.
// Return value:
// The number of children, or -1 on error.
DLLEXPORT int STDCALL
FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree);
// Function: FPDF_StructTree_GetChildAtIndex
// Get a child in the structure tree.
// Parameters:
// struct_tree - Handle to the struct tree. Returned by
// FPDF_StructTree_LoadPage function.
// index - The index for the child, 0-based.
// Return value:
// The child at the n-th index or NULL on error.
DLLEXPORT FPDF_STRUCTELEMENT STDCALL
FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index);
// Function: FPDF_StructElement_GetAltText
// Get the alt text for a given element.
// Parameters:
// struct_element - Handle to the struct element.
// buffer - A buffer for output the alt text. May be NULL.
// buflen - The length of the buffer, in bytes. May be 0.
// Return value:
// The number of bytes in the title, including the terminating NUL
// character. The number of bytes is returned regardless of the
// |buffer| and |buflen| parameters.
// Comments:
// Regardless of the platform, the |buffer| is always in UTF-16LE
// encoding. The string is terminated by a UTF16 NUL character. If
// |buflen| is less than the required length, or |buffer| is NULL,
// |buffer| will not be modified.
DLLEXPORT unsigned long STDCALL
FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen);
// Function: FPDF_StructElement_CountChildren
// Count the number of children for the structure element.
// Parameters:
// struct_element - Handle to the struct element.
// Return value:
// The number of children, or -1 on error.
DLLEXPORT int STDCALL
FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element);
// Function: FPDF_StructElement_GetChildAtIndex
// Get a child in the structure element.
// Parameters:
// struct_tree - Handle to the struct element.
// index - The index for the child, 0-based.
// Return value:
// The child at the n-th index or NULL on error.
// Comments:
// If the child exists but is not an element, then this function will
// return NULL. This will also return NULL for out of bounds indices.
DLLEXPORT FPDF_STRUCTELEMENT STDCALL
FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
int index);
#ifdef __cplusplus
}
#endif
#endif // PUBLIC_FPDF_STRUCTTREE_H_
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