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authorTom Sepez <tsepez@chromium.org>2015-05-11 15:25:39 -0700
committerTom Sepez <tsepez@chromium.org>2015-05-11 15:25:39 -0700
commit1ed8a21d5c26a9d78240d7d56850a1a4738d3f9c (patch)
tree6dc3c6d9007b5be6843c4e9dbf602a99238080b3 /public/fpdf_text.h
parentea7b333c73ea3e1847e79cabdd85853af67d6d6c (diff)
downloadpdfium-1ed8a21d5c26a9d78240d7d56850a1a4738d3f9c.tar.xz
Merge to XFA: Create top-level public/ header directory.
Original Review URL: https://codereview.chromium.org/1135913002 BUG=pdfium:154 R=thestig@chromium.org Review URL: https://codereview.chromium.org/1136703003
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+// Copyright 2014 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 _FPDFTEXT_H_
+#define _FPDFTEXT_H_
+
+#include "fpdfview.h"
+
+// Exported Functions
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Function: FPDFText_LoadPage
+// Prepare information about all characters in a page.
+// Parameters:
+// page - Handle to the page. Returned by FPDF_LoadPage function (in FPDFVIEW module).
+// Return value:
+// A handle to the text page information structure.
+// NULL if something goes wrong.
+// Comments:
+// Application must call FPDFText_ClosePage to release the text page information.
+// Notes:
+// The method can not support to load out FPDF_TEXTPAGE for the document consists of dynamic fields.
+//
+DLLEXPORT FPDF_TEXTPAGE STDCALL FPDFText_LoadPage(FPDF_PAGE page);
+
+// Function: FPDFText_ClosePage
+// Release all resources allocated for a text page information structure.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// Return Value:
+// None.
+//
+DLLEXPORT void STDCALL FPDFText_ClosePage(FPDF_TEXTPAGE text_page);
+
+// Function: FPDFText_CountChars
+// Get number of characters in a page.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// Return value:
+// Number of characters in the page. Return -1 for error.
+// Generated characters, like additional space characters, new line characters, are also counted.
+// Comments:
+// Characters in a page form a "stream", inside the stream, each character has an index.
+// We will use the index parameters in many of FPDFTEXT functions. The first character in the page
+// has an index value of zero.
+//
+DLLEXPORT int STDCALL FPDFText_CountChars(FPDF_TEXTPAGE text_page);
+
+// Function: FPDFText_GetUnicode
+// Get Unicode of a character in a page.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// index - Zero-based index of the character.
+// Return value:
+// The Unicode of the particular character.
+// If a character is not encoded in Unicode and Foxit engine can't convert to Unicode,
+// the return value will be zero.
+//
+DLLEXPORT unsigned int STDCALL FPDFText_GetUnicode(FPDF_TEXTPAGE text_page, int index);
+
+// Function: FPDFText_GetFontSize
+// Get the font size of a particular character.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// index - Zero-based index of the character.
+// Return value:
+// The font size of the particular character, measured in points (about 1/72 inch).
+// This is the typographic size of the font (so called "em size").
+//
+DLLEXPORT double STDCALL FPDFText_GetFontSize(FPDF_TEXTPAGE text_page, int index);
+
+// Function: FPDFText_GetCharBox
+// Get bounding box of a particular character.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// index - Zero-based index of the character.
+// left - Pointer to a double number receiving left position of the character box.
+// right - Pointer to a double number receiving right position of the character box.
+// bottom - Pointer to a double number receiving bottom position of the character box.
+// top - Pointer to a double number receiving top position of the character box.
+// Return Value:
+// None.
+// Comments:
+// All positions are measured in PDF "user space".
+//
+DLLEXPORT void STDCALL FPDFText_GetCharBox(FPDF_TEXTPAGE text_page, int index, double* left,
+ double* right, double* bottom, double* top);
+
+// Function: FPDFText_GetCharIndexAtPos
+// Get the index of a character at or nearby a certain position on the page.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// x - X position in PDF "user space".
+// y - Y position in PDF "user space".
+// xTolerance - An x-axis tolerance value for character hit detection, in point unit.
+// yTolerance - A y-axis tolerance value for character hit detection, in point unit.
+// Return Value:
+// The zero-based index of the character at, or nearby the point (x,y).
+// If there is no character at or nearby the point, return value will be -1.
+// If an error occurs, -3 will be returned.
+//
+DLLEXPORT int STDCALL FPDFText_GetCharIndexAtPos(FPDF_TEXTPAGE text_page,
+ double x, double y, double xTorelance, double yTolerance);
+
+// Function: FPDFText_GetText
+// Extract unicode text string from the page.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// start_index - Index for the start characters.
+// count - Number of characters to be extracted.
+// result - A buffer (allocated by application) receiving the extracted unicodes.
+// The size of the buffer must be able to hold the number of characters plus a terminator.
+// Return Value:
+// Number of characters written into the result buffer, including the trailing terminator.
+// Comments:
+// This function ignores characters without unicode information.
+//
+DLLEXPORT int STDCALL FPDFText_GetText(FPDF_TEXTPAGE text_page, int start_index, int count, unsigned short* result);
+
+// Function: FPDFText_CountRects
+// Count number of rectangular areas occupied by a segment of texts.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// start_index - Index for the start characters.
+// count - Number of characters.
+// Return value:
+// Number of rectangles. Zero for error.
+// Comments:
+// This function, along with FPDFText_GetRect can be used by applications to detect the position
+// on the page for a text segment, so proper areas can be highlighted or something.
+// FPDFTEXT will automatically merge small character boxes into bigger one if those characters
+// are on the same line and use same font settings.
+//
+DLLEXPORT int STDCALL FPDFText_CountRects(FPDF_TEXTPAGE text_page, int start_index, int count);
+
+// Function: FPDFText_GetRect
+// Get a rectangular area from the result generated by FPDFText_CountRects.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// rect_index - Zero-based index for the 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:
+// None.
+//
+DLLEXPORT void STDCALL FPDFText_GetRect(FPDF_TEXTPAGE text_page, int rect_index, double* left, double* top,
+ double* right, double* bottom);
+
+// Function: FPDFText_GetBoundedText
+// Extract unicode text within a rectangular boundary on the page.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// left - Left boundary.
+// top - Top boundary.
+// right - Right boundary.
+// bottom - Bottom boundary.
+// buffer - A unicode buffer.
+// buflen - Number of characters (not bytes) for the buffer, excluding an additional terminator.
+// Return Value:
+// If buffer is NULL or buflen is zero, return number of characters (not bytes) of text present within
+// the rectangle, excluding a terminating NUL. Generally you should pass a buffer at least one larger
+// than this if you want a terminating NUL, which will be provided if space is available.
+// Otherwise, return number of characters copied into the buffer, including the terminating NUL
+// when space for it is available.
+// Comment:
+// If the buffer is too small, as much text as will fit is copied into it.
+//
+DLLEXPORT int STDCALL FPDFText_GetBoundedText(FPDF_TEXTPAGE text_page,double left, double top,
+ double right, double bottom,unsigned short* buffer,int buflen);
+
+
+// Flags used by FPDFText_FindStart function.
+#define FPDF_MATCHCASE 0x00000001 //If not set, it will not match case by default.
+#define FPDF_MATCHWHOLEWORD 0x00000002 //If not set, it will not match the whole word by default.
+
+// Function: FPDFText_FindStart
+// Start a search.
+// Parameters:
+// text_page - Handle to a text page information structure. Returned by FPDFText_LoadPage function.
+// findwhat - A unicode match pattern.
+// flags - Option flags.
+// start_index - Start from this character. -1 for end of the page.
+// Return Value:
+// A handle for the search context. FPDFText_FindClose must be called to release this handle.
+//
+DLLEXPORT FPDF_SCHHANDLE STDCALL FPDFText_FindStart(FPDF_TEXTPAGE text_page, FPDF_WIDESTRING findwhat,
+ unsigned long flags, int start_index);
+
+// Function: FPDFText_FindNext
+// Search in the direction from page start to end.
+// Parameters:
+// handle - A search context handle returned by FPDFText_FindStart.
+// Return Value:
+// Whether a match is found.
+//
+DLLEXPORT FPDF_BOOL STDCALL FPDFText_FindNext(FPDF_SCHHANDLE handle);
+
+// Function: FPDFText_FindPrev
+// Search in the direction from page end to start.
+// Parameters:
+// handle - A search context handle returned by FPDFText_FindStart.
+// Return Value:
+// Whether a match is found.
+//
+DLLEXPORT FPDF_BOOL STDCALL FPDFText_FindPrev(FPDF_SCHHANDLE handle);
+
+// Function: FPDFText_GetSchResultIndex
+// Get the starting character index of the search result.
+// Parameters:
+// handle - A search context handle returned by FPDFText_FindStart.
+// Return Value:
+// Index for the starting character.
+//
+DLLEXPORT int STDCALL 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.
+//
+DLLEXPORT int STDCALL 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.
+//
+DLLEXPORT void STDCALL FPDFText_FindClose(FPDF_SCHHANDLE handle);
+
+// 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.
+// 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 "http://www.foxitsoftware.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.
+//
+DLLEXPORT FPDF_PAGELINK STDCALL 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.
+//
+DLLEXPORT int STDCALL 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.
+// buflen - Number of characters (not bytes) for the buffer, including an additional terminator.
+// Return Value:
+// If buffer is NULL or buflen is zero, return number of characters (not bytes and an additional terminator is also counted) needed,
+// otherwise, return number of characters copied into the buffer.
+//
+DLLEXPORT int STDCALL 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.
+//
+DLLEXPORT int STDCALL 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:
+// None.
+//
+DLLEXPORT void STDCALL FPDFLink_GetRect(FPDF_PAGELINK link_page, int link_index, int rect_index,
+ double* left, double* top,double* right, double* bottom);
+
+// Function: FPDFLink_CloseWebLinks
+// Release resources used by weblink feature.
+// Parameters:
+// link_page - Handle returned by FPDFLink_LoadWebLinks.
+// Return Value:
+// None.
+//
+DLLEXPORT void STDCALL FPDFLink_CloseWebLinks(FPDF_PAGELINK link_page);
+
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif//_FPDFTEXT_H_