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637 lines
29 KiB
637 lines
29 KiB
// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#ifndef PUBLIC_FPDF_TEXT_H_
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#define PUBLIC_FPDF_TEXT_H_
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// clang-format off
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// NOLINTNEXTLINE(build/include)
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#include "fpdfview.h"
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// Exported Functions
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Function: FPDFText_LoadPage
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// Prepare information about all characters in a page.
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// Parameters:
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// page - Handle to the page. Returned by FPDF_LoadPage function
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// (in FPDFVIEW module).
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// Return value:
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// A handle to the text page information structure.
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// NULL if something goes wrong.
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// Comments:
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// Application must call FPDFText_ClosePage to release the text page
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// information.
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//
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FPDF_EXPORT FPDF_TEXTPAGE FPDF_CALLCONV FPDFText_LoadPage(FPDF_PAGE page);
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// Function: FPDFText_ClosePage
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// Release all resources allocated for a text page information
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// structure.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// Return Value:
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// None.
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//
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FPDF_EXPORT void FPDF_CALLCONV FPDFText_ClosePage(FPDF_TEXTPAGE text_page);
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// Function: FPDFText_CountChars
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// Get number of characters in a page.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// Return value:
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// Number of characters in the page. Return -1 for error.
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// Generated characters, like additional space characters, new line
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// characters, are also counted.
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// Comments:
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// Characters in a page form a "stream", inside the stream, each
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// character has an index.
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// We will use the index parameters in many of FPDFTEXT functions. The
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// first character in the page
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// has an index value of zero.
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//
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FPDF_EXPORT int FPDF_CALLCONV FPDFText_CountChars(FPDF_TEXTPAGE text_page);
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// Function: FPDFText_GetUnicode
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// Get Unicode of a character in a page.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// Return value:
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// The Unicode of the particular character.
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// If a character is not encoded in Unicode and Foxit engine can't
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// convert to Unicode,
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// the return value will be zero.
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//
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FPDF_EXPORT unsigned int FPDF_CALLCONV
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FPDFText_GetUnicode(FPDF_TEXTPAGE text_page, int index);
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// Function: FPDFText_GetFontSize
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// Get the font size of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// Return value:
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// The font size of the particular character, measured in points (about
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// 1/72 inch). This is the typographic size of the font (so called
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// "em size").
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//
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FPDF_EXPORT double FPDF_CALLCONV FPDFText_GetFontSize(FPDF_TEXTPAGE text_page,
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int index);
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// Experimental API.
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// Function: FPDFText_GetFontInfo
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// Get the font name and flags of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// buffer - A buffer receiving the font name.
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// buflen - The length of |buffer| in bytes.
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// flags - Optional pointer to an int receiving the font flags.
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// These flags should be interpreted per PDF spec 1.7
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// Section 5.7.1 Font Descriptor Flags.
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// Return value:
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// On success, return the length of the font name, including the
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// trailing NUL character, in bytes. If this length is less than or
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// equal to |length|, |buffer| is set to the font name, |flags| is
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// set to the font flags. |buffer| is in UTF-8 encoding. Return 0 on
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// failure.
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//
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FPDF_EXPORT unsigned long FPDF_CALLCONV
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FPDFText_GetFontInfo(FPDF_TEXTPAGE text_page,
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int index,
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void* buffer,
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unsigned long buflen,
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int* flags);
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// Experimental API.
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// Function: FPDFText_GetFontWeight
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// Get the font weight of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// Return value:
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// On success, return the font weight of the particular character. If
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// |text_page| is invalid, if |index| is out of bounds, or if the
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// character's text object is undefined, return -1.
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//
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FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetFontWeight(FPDF_TEXTPAGE text_page,
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int index);
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// Experimental API.
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// Function: FPDFText_GetTextRenderMode
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// Get text rendering mode of character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// Return Value:
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// On success, return the render mode value. A valid value is of type
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// FPDF_TEXT_RENDERMODE. If |text_page| is invalid, if |index| is out
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// of bounds, or if the text object is undefined, then return
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// FPDF_TEXTRENDERMODE_UNKNOWN.
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//
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FPDF_EXPORT FPDF_TEXT_RENDERMODE FPDF_CALLCONV
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FPDFText_GetTextRenderMode(FPDF_TEXTPAGE text_page, int index);
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// Experimental API.
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// Function: FPDFText_GetFillColor
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// Get the fill color of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// R - Pointer to an unsigned int number receiving the
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// red value of the fill color.
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// G - Pointer to an unsigned int number receiving the
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// green value of the fill color.
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// B - Pointer to an unsigned int number receiving the
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// blue value of the fill color.
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// A - Pointer to an unsigned int number receiving the
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// alpha value of the fill color.
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// Return value:
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// Whether the call succeeded. If false, |R|, |G|, |B| and |A| are
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// unchanged.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_GetFillColor(FPDF_TEXTPAGE text_page,
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int index,
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unsigned int* R,
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unsigned int* G,
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unsigned int* B,
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unsigned int* A);
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// Experimental API.
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// Function: FPDFText_GetStrokeColor
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// Get the stroke color of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// R - Pointer to an unsigned int number receiving the
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// red value of the stroke color.
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// G - Pointer to an unsigned int number receiving the
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// green value of the stroke color.
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// B - Pointer to an unsigned int number receiving the
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// blue value of the stroke color.
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// A - Pointer to an unsigned int number receiving the
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// alpha value of the stroke color.
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// Return value:
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// Whether the call succeeded. If false, |R|, |G|, |B| and |A| are
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// unchanged.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_GetStrokeColor(FPDF_TEXTPAGE text_page,
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int index,
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unsigned int* R,
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unsigned int* G,
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unsigned int* B,
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unsigned int* A);
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// Experimental API.
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// Function: FPDFText_GetCharAngle
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// Get character rotation angle.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// Return Value:
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// On success, return the angle value in radian. Value will always be
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// greater or equal to 0. If |text_page| is invalid, or if |index| is
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// out of bounds, then return -1.
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//
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FPDF_EXPORT float FPDF_CALLCONV FPDFText_GetCharAngle(FPDF_TEXTPAGE text_page,
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int index);
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// Function: FPDFText_GetCharBox
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// Get bounding box of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// left - Pointer to a double number receiving left position
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// of the character box.
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// right - Pointer to a double number receiving right position
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// of the character box.
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// bottom - Pointer to a double number receiving bottom position
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// of the character box.
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// top - Pointer to a double number receiving top position of
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// the character box.
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// Return Value:
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// On success, return TRUE and fill in |left|, |right|, |bottom|, and
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// |top|. If |text_page| is invalid, or if |index| is out of bounds,
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// then return FALSE, and the out parameters remain unmodified.
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// Comments:
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// All positions are measured in PDF "user space".
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetCharBox(FPDF_TEXTPAGE text_page,
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int index,
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double* left,
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double* right,
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double* bottom,
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double* top);
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// Experimental API.
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// Function: FPDFText_GetLooseCharBox
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// Get a "loose" bounding box of a particular character, i.e., covering
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// the entire glyph bounds, without taking the actual glyph shape into
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// account.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// rect - Pointer to a FS_RECTF receiving the character box.
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// Return Value:
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// On success, return TRUE and fill in |rect|. If |text_page| is
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// invalid, or if |index| is out of bounds, then return FALSE, and the
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// |rect| out parameter remains unmodified.
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// Comments:
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// All positions are measured in PDF "user space".
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_GetLooseCharBox(FPDF_TEXTPAGE text_page, int index, FS_RECTF* rect);
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// Experimental API.
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// Function: FPDFText_GetMatrix
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// Get the effective transformation matrix for a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage().
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// index - Zero-based index of the character.
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// matrix - Pointer to a FS_MATRIX receiving the transformation
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// matrix.
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// Return Value:
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// On success, return TRUE and fill in |matrix|. If |text_page| is
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// invalid, or if |index| is out of bounds, or if |matrix| is NULL,
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// then return FALSE, and |matrix| remains unmodified.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetMatrix(FPDF_TEXTPAGE text_page,
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int index,
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FS_MATRIX* matrix);
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// Function: FPDFText_GetCharOrigin
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// Get origin of a particular character.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// index - Zero-based index of the character.
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// x - Pointer to a double number receiving x coordinate of
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// the character origin.
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// y - Pointer to a double number receiving y coordinate of
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// the character origin.
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// Return Value:
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// Whether the call succeeded. If false, x and y are unchanged.
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// Comments:
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// All positions are measured in PDF "user space".
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_GetCharOrigin(FPDF_TEXTPAGE text_page,
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int index,
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double* x,
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double* y);
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// Function: FPDFText_GetCharIndexAtPos
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// Get the index of a character at or nearby a certain position on the
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// page.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// x - X position in PDF "user space".
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// y - Y position in PDF "user space".
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// xTolerance - An x-axis tolerance value for character hit
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// detection, in point units.
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// yTolerance - A y-axis tolerance value for character hit
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// detection, in point units.
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// Return Value:
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// The zero-based index of the character at, or nearby the point (x,y).
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// If there is no character at or nearby the point, return value will
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// be -1. If an error occurs, -3 will be returned.
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//
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FPDF_EXPORT int FPDF_CALLCONV
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FPDFText_GetCharIndexAtPos(FPDF_TEXTPAGE text_page,
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double x,
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double y,
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double xTolerance,
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double yTolerance);
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// Function: FPDFText_GetText
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// Extract unicode text string from the page.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// start_index - Index for the start characters.
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// count - Number of characters to be extracted.
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// result - A buffer (allocated by application) receiving the
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// extracted unicodes. The size of the buffer must be
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// able to hold the number of characters plus a
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// terminator.
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// Return Value:
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// Number of characters written into the result buffer, including the
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// trailing terminator.
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// Comments:
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// This function ignores characters without unicode information.
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//
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FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetText(FPDF_TEXTPAGE text_page,
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int start_index,
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int count,
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unsigned short* result);
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// Function: FPDFText_CountRects
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// Count number of rectangular areas occupied by a segment of texts.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// start_index - Index for the start characters.
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// count - Number of characters.
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// Return value:
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// Number of rectangles. Zero for error.
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// Comments:
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// This function, along with FPDFText_GetRect can be used by
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// applications to detect the position on the page for a text segment,
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// so proper areas can be highlighted. FPDFTEXT will automatically
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// merge small character boxes into bigger one if those characters
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// are on the same line and use same font settings.
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//
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FPDF_EXPORT int FPDF_CALLCONV FPDFText_CountRects(FPDF_TEXTPAGE text_page,
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int start_index,
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int count);
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// Function: FPDFText_GetRect
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// Get a rectangular area from the result generated by
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// FPDFText_CountRects.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// rect_index - Zero-based index for the rectangle.
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// left - Pointer to a double value receiving the rectangle
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// left boundary.
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// top - Pointer to a double value receiving the rectangle
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// top boundary.
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// right - Pointer to a double value receiving the rectangle
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// right boundary.
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// bottom - Pointer to a double value receiving the rectangle
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// bottom boundary.
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// Return Value:
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// On success, return TRUE and fill in |left|, |top|, |right|, and
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// |bottom|. If |text_page| is invalid then return FALSE, and the out
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// parameters remain unmodified. If |text_page| is valid but
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// |rect_index| is out of bounds, then return FALSE and set the out
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// parameters to 0.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetRect(FPDF_TEXTPAGE text_page,
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int rect_index,
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double* left,
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double* top,
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double* right,
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double* bottom);
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// Function: FPDFText_GetBoundedText
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// Extract unicode text within a rectangular boundary on the page.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// left - Left boundary.
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// top - Top boundary.
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// right - Right boundary.
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// bottom - Bottom boundary.
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// buffer - A unicode buffer.
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// buflen - Number of characters (not bytes) for the buffer,
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// excluding an additional terminator.
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// Return Value:
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// If buffer is NULL or buflen is zero, return number of characters
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// (not bytes) of text present within the rectangle, excluding a
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// terminating NUL. Generally you should pass a buffer at least one
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// larger than this if you want a terminating NUL, which will be
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// provided if space is available. Otherwise, return number of
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// characters copied into the buffer, including the terminating NUL
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// when space for it is available.
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// Comment:
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// If the buffer is too small, as much text as will fit is copied into
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// it.
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//
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FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetBoundedText(FPDF_TEXTPAGE text_page,
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double left,
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double top,
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double right,
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double bottom,
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unsigned short* buffer,
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int buflen);
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// Flags used by FPDFText_FindStart function.
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//
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// If not set, it will not match case by default.
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#define FPDF_MATCHCASE 0x00000001
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// If not set, it will not match the whole word by default.
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#define FPDF_MATCHWHOLEWORD 0x00000002
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// If not set, it will skip past the current match to look for the next match.
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#define FPDF_CONSECUTIVE 0x00000004
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// Function: FPDFText_FindStart
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// Start a search.
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// Parameters:
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// text_page - Handle to a text page information structure.
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// Returned by FPDFText_LoadPage function.
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// findwhat - A unicode match pattern.
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// flags - Option flags.
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// start_index - Start from this character. -1 for end of the page.
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// Return Value:
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// A handle for the search context. FPDFText_FindClose must be called
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// to release this handle.
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//
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FPDF_EXPORT FPDF_SCHHANDLE FPDF_CALLCONV
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FPDFText_FindStart(FPDF_TEXTPAGE text_page,
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FPDF_WIDESTRING findwhat,
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unsigned long flags,
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int start_index);
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// Function: FPDFText_FindNext
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// Search in the direction from page start to end.
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// Parameters:
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// handle - A search context handle returned by
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// FPDFText_FindStart.
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// Return Value:
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// Whether a match is found.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_FindNext(FPDF_SCHHANDLE handle);
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// Function: FPDFText_FindPrev
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// Search in the direction from page end to start.
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// Parameters:
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// handle - A search context handle returned by
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// FPDFText_FindStart.
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// Return Value:
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// Whether a match is found.
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//
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_FindPrev(FPDF_SCHHANDLE handle);
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// Function: FPDFText_GetSchResultIndex
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// Get the starting character index of the search result.
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// Parameters:
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// handle - A search context handle returned by
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// FPDFText_FindStart.
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// Return Value:
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|
// Index for the starting character.
|
|
//
|
|
FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetSchResultIndex(FPDF_SCHHANDLE handle);
|
|
|
|
// Function: FPDFText_GetSchCount
|
|
// Get the number of matched characters in the search result.
|
|
// Parameters:
|
|
// handle - A search context handle returned by
|
|
// FPDFText_FindStart.
|
|
// Return Value:
|
|
// Number of matched characters.
|
|
//
|
|
FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetSchCount(FPDF_SCHHANDLE handle);
|
|
|
|
// Function: FPDFText_FindClose
|
|
// Release a search context.
|
|
// Parameters:
|
|
// handle - A search context handle returned by
|
|
// FPDFText_FindStart.
|
|
// Return Value:
|
|
// None.
|
|
//
|
|
FPDF_EXPORT void FPDF_CALLCONV FPDFText_FindClose(FPDF_SCHHANDLE handle);
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|
|
|
// Function: FPDFLink_LoadWebLinks
|
|
// Prepare information about weblinks in a page.
|
|
// Parameters:
|
|
// text_page - Handle to a text page information structure.
|
|
// Returned by FPDFText_LoadPage function.
|
|
// Return Value:
|
|
// A handle to the page's links information structure, or
|
|
// NULL if something goes wrong.
|
|
// Comments:
|
|
// Weblinks are those links implicitly embedded in PDF pages. PDF also
|
|
// has a type of annotation called "link" (FPDFTEXT doesn't deal with
|
|
// that kind of link). FPDFTEXT weblink feature is useful for
|
|
// automatically detecting links in the page contents. For example,
|
|
// things like "https://www.example.com" will be detected, so
|
|
// applications can allow user to click on those characters to activate
|
|
// the link, even the PDF doesn't come with link annotations.
|
|
//
|
|
// FPDFLink_CloseWebLinks must be called to release resources.
|
|
//
|
|
FPDF_EXPORT FPDF_PAGELINK FPDF_CALLCONV
|
|
FPDFLink_LoadWebLinks(FPDF_TEXTPAGE text_page);
|
|
|
|
// Function: FPDFLink_CountWebLinks
|
|
// Count number of detected web links.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// Return Value:
|
|
// Number of detected web links.
|
|
//
|
|
FPDF_EXPORT int FPDF_CALLCONV FPDFLink_CountWebLinks(FPDF_PAGELINK link_page);
|
|
|
|
// Function: FPDFLink_GetURL
|
|
// Fetch the URL information for a detected web link.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// link_index - Zero-based index for the link.
|
|
// buffer - A unicode buffer for the result.
|
|
// buflen - Number of 16-bit code units (not bytes) for the
|
|
// buffer, including an additional terminator.
|
|
// Return Value:
|
|
// If |buffer| is NULL or |buflen| is zero, return the number of 16-bit
|
|
// code units (not bytes) needed to buffer the result (an additional
|
|
// terminator is included in this count).
|
|
// Otherwise, copy the result into |buffer|, truncating at |buflen| if
|
|
// the result is too large to fit, and return the number of 16-bit code
|
|
// units actually copied into the buffer (the additional terminator is
|
|
// also included in this count).
|
|
// If |link_index| does not correspond to a valid link, then the result
|
|
// is an empty string.
|
|
//
|
|
FPDF_EXPORT int FPDF_CALLCONV FPDFLink_GetURL(FPDF_PAGELINK link_page,
|
|
int link_index,
|
|
unsigned short* buffer,
|
|
int buflen);
|
|
|
|
// Function: FPDFLink_CountRects
|
|
// Count number of rectangular areas for the link.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// link_index - Zero-based index for the link.
|
|
// Return Value:
|
|
// Number of rectangular areas for the link. If |link_index| does
|
|
// not correspond to a valid link, then 0 is returned.
|
|
//
|
|
FPDF_EXPORT int FPDF_CALLCONV FPDFLink_CountRects(FPDF_PAGELINK link_page,
|
|
int link_index);
|
|
|
|
// Function: FPDFLink_GetRect
|
|
// Fetch the boundaries of a rectangle for a link.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// link_index - Zero-based index for the link.
|
|
// rect_index - Zero-based index for a rectangle.
|
|
// left - Pointer to a double value receiving the rectangle
|
|
// left boundary.
|
|
// top - Pointer to a double value receiving the rectangle
|
|
// top boundary.
|
|
// right - Pointer to a double value receiving the rectangle
|
|
// right boundary.
|
|
// bottom - Pointer to a double value receiving the rectangle
|
|
// bottom boundary.
|
|
// Return Value:
|
|
// On success, return TRUE and fill in |left|, |top|, |right|, and
|
|
// |bottom|. If |link_page| is invalid or if |link_index| does not
|
|
// correspond to a valid link, then return FALSE, and the out
|
|
// parameters remain unmodified.
|
|
//
|
|
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFLink_GetRect(FPDF_PAGELINK link_page,
|
|
int link_index,
|
|
int rect_index,
|
|
double* left,
|
|
double* top,
|
|
double* right,
|
|
double* bottom);
|
|
|
|
// Experimental API.
|
|
// Function: FPDFLink_GetTextRange
|
|
// Fetch the start char index and char count for a link.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// link_index - Zero-based index for the link.
|
|
// start_char_index - pointer to int receiving the start char index
|
|
// char_count - pointer to int receiving the char count
|
|
// Return Value:
|
|
// On success, return TRUE and fill in |start_char_index| and
|
|
// |char_count|. if |link_page| is invalid or if |link_index| does
|
|
// not correspond to a valid link, then return FALSE and the out
|
|
// parameters remain unmodified.
|
|
//
|
|
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
|
|
FPDFLink_GetTextRange(FPDF_PAGELINK link_page,
|
|
int link_index,
|
|
int* start_char_index,
|
|
int* char_count);
|
|
|
|
// Function: FPDFLink_CloseWebLinks
|
|
// Release resources used by weblink feature.
|
|
// Parameters:
|
|
// link_page - Handle returned by FPDFLink_LoadWebLinks.
|
|
// Return Value:
|
|
// None.
|
|
//
|
|
FPDF_EXPORT void FPDF_CALLCONV FPDFLink_CloseWebLinks(FPDF_PAGELINK link_page);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // PUBLIC_FPDF_TEXT_H_
|