667 lines
22 KiB
C
667 lines
22 KiB
C
// Copyright (C) 2004-2021 Artifex Software, Inc.
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//
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// This file is part of MuPDF.
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//
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// MuPDF is free software: you can redistribute it and/or modify it under the
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// terms of the GNU Affero General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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//
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// Alternative licensing terms are available from the licensor.
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// For commercial licensing, see <https://www.artifex.com/> or contact
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// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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// CA 94129, USA, for further information.
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/**
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* Mu Office Library
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*
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* This helper layer provides an API for loading, and displaying
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* a file. It is deliberately as identical as possible to the
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* smart-office-lib.h header file in Smart Office to facilitate
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* a product which can use both Smart Office and MuPDF.
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*/
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#ifndef MU_OFFICE_LIB_H
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#define MU_OFFICE_LIB_H
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/*
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* General use
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*
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* This library uses threads but is not thread safe for the caller. All
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* calls should be made from a single thread. Some calls allow the user
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* to arrange for their own functions to be called back from the library;
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* often the users functions will be called back from a different thread. If
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* a call into the library is required in response to information from a
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* callback, it is the responsibility of the user to arrange for those
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* library calls to be made on the same thread as for other library calls.
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* Calls back into the library from a callback are not permitted.
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*
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* There are two main modes of use. In interactive windowing systems, it
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* is usual for the app developers code to be called on the main UI thread.
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* It is from the UI thread that all library calls should be made. Such
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* systems usually provide a way to post a call onto the UI thread. That
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* is the best way to respond to a callback from the library.
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*
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* The other mode of use is for plain executables that might wish to
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* (say) generate images of all the pages of a document. This can
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* be achieved, without use of callbacks, using the few synchronous
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* calls. E.g., MuOfficeDoc_getNumPages will wait for background document
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* loading to complete before returning the total number of pages and
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* MuOfficeRender_destroy will wait for background rendering to complete
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* before returning.
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*/
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#include <stddef.h> /* For size_t */
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#include "mupdf/fitz.h" /* For fz_context/fz_document/fz_page */
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/** Error type returned from most MuOffice functions
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*
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* 0 means no error
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*
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* non-zero values mean an error occurred. The exact value is an indication
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* of what went wrong and should be included in bug reports or support
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* queries. Library users should not test this value except for 0,
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* non-zero and any explicitly documented values.
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*/
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typedef int MuError;
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/** Errors returned to MuOfficeLoadingErrorFn
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*
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* Other values may also be returned.
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*/
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typedef enum MuOfficeDocErrorType
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{
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MuOfficeDocErrorType_NoError = 0,
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MuOfficeDocErrorType_UnsupportedDocumentType = 1,
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MuOfficeDocErrorType_EmptyDocument = 2,
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MuOfficeDocErrorType_UnableToLoadDocument = 4,
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MuOfficeDocErrorType_UnsupportedEncryption = 5,
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MuOfficeDocErrorType_Aborted = 6,
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MuOfficeDocErrorType_OutOfMemory = 7,
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/* FIXME: Additional ones that should be backported to
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* smart-office-lib.h */
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MuOfficeDocErrorType_IllegalArgument = 8,
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/** A password is required to open this document.
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*
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* The app should provide it using MuOffice_providePassword
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* or if it doesn't want to proceed call MuOfficeDoc_destroy or
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* MuOfficeDoc_abortLoad.
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*/
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MuOfficeDocErrorType_PasswordRequest = 0x1000
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} MuOfficeDocErrorType;
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/**
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*Structure holding the detail of the layout of a bitmap. b5g6r5 is assumed.
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*/
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typedef struct
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{
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void *memptr;
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int width;
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int height;
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int lineSkip;
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} MuOfficeBitmap;
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/**
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* Structure defining a point
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*
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* x x coord of point
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* y y coord of point
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*/
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typedef struct
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{
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float x;
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float y;
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} MuOfficePoint;
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/**
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* Structure defining a rectangle
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*
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* x x coord of top left of area within the page
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* y y coord of top left of area within the page
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* width width of area
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* height height of area
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*/
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typedef struct
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{
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float x;
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float y;
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float width;
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float height;
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} MuOfficeBox;
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typedef enum MuOfficePointType
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{
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MuOfficePointType_MoveTo,
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MuOfficePointType_LineTo
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} MuOfficePointType;
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typedef struct
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{
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float x;
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float y;
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MuOfficePointType type;
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} MuOfficePathPoint;
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/**
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* Structure defining what area of a page should be rendered and to what
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* area of the bitmap
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*
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* origin coordinates of the document origin within the bitmap
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* renderArea the part of the bitmap to which to render
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*/
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typedef struct
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{
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MuOfficePoint origin;
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MuOfficeBox renderArea;
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} MuOfficeRenderArea;
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typedef struct MuOfficeLib MuOfficeLib;
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typedef struct MuOfficeDoc MuOfficeDoc;
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typedef struct MuOfficePage MuOfficePage;
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typedef struct MuOfficeRender MuOfficeRender;
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/**
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* Allocator function used by some functions to get blocks of memory.
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*
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* @param cookie data pointer passed in with the allocator.
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* @param size the size of the required block.
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*
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* @returns as for malloc. (NULL implies OutOfMemory, or size == 0).
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* Otherwise a pointer to an allocated block.
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*/
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typedef void *(MuOfficeAllocFn)(void *cookie,
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size_t size);
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/**
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* Callback function monitoring document loading
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*
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* Also called when the document is edited, either adding or
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* removing pages, with the pagesLoaded value decreasing
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* in the page-removal case.
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*
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* @param cookie the data pointer that was originally passed
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* to MuOfficeLib_loadDocument.
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* @param pagesLoaded the number of pages so far discovered.
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* @param complete whether loading has completed. If this flag
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* is set, pagesLoaded is the actual number of
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* pages in the document.
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*/
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typedef void (MuOfficeLoadingProgressFn)(void *cookie,
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int pagesLoaded,
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int complete);
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/**
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* Callback function used to monitor errors in the process of loading
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* a document.
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*
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* @param cookie the data pointer that was originally passed
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* to MuOfficeLib_loadDocument.
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* @param error the error being reported
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*/
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typedef void (MuOfficeLoadingErrorFn)( void *cookie,
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MuOfficeDocErrorType error);
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/**
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* Callback function used to monitor page changes
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*
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* @param cookie the data pointer that was originally passed
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* to MuOfficeDoc_getPage.
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* @param area the area that has changed.
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*/
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typedef void (MuOfficePageUpdateFn)( void *cookie,
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const MuOfficeBox *area);
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/**
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* Callback function used to monitor a background render of a
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* document page. The function is called exactly once.
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*
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* @param cookie the data pointer that was originally passed
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* to MuOfficeDoc_monitorRenderProgress.
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* @param error error returned from the rendering process
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*/
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typedef void (MuOfficeRenderProgressFn)(void *cookie,
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MuError error);
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/**
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* Document types
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*
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* Keep in sync with smart-office-lib.h
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*/
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typedef enum
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{
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MuOfficeDocType_PDF,
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MuOfficeDocType_XPS,
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MuOfficeDocType_IMG
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} MuOfficeDocType;
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/**
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* The possible results of a save operation
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*/
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typedef enum MuOfficeSaveResult
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{
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MuOfficeSave_Succeeded,
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MuOfficeSave_Error,
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MuOfficeSave_Cancelled
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}
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MuOfficeSaveResult;
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/**
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* Callback function used to monitor save operations.
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*
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* @param cookie the data pointer that was originally passed to
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* MuOfficeDoc_save.
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* @param result the result of the save operation
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*/
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typedef void (MuOfficeSaveResultFn)( void *cookie,
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MuOfficeSaveResult result);
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/**
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* Create a MuOfficeLib instance.
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*
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* @param pMu address of variable to
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* receive the created instance
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeLib_create(MuOfficeLib **pMu);
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/**
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* Destroy a MuOfficeLib instance
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*
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* @param mu the instance to destroy
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*/
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void MuOfficeLib_destroy(MuOfficeLib *mu);
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/**
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* Find the type of a file given its filename extension.
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*
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* @param path path to the file (in utf8)
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*
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* @return a valid MuOfficeDocType value, or MuOfficeDocType_Other
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*/
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MuOfficeDocType MuOfficeLib_getDocTypeFromFileExtension(const char *path);
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/**
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* Return a list of filename extensions supported by Mu Office library.
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*
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* @return comma-delimited list of extensions, without the leading ".".
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* The caller should free the returned pointer..
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*/
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char * MuOfficeLib_getSupportedFileExtensions(void);
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/**
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* Load a document
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*
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* Call will return immediately, leaving the document loading
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* in the background
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*
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* @param mu a MuOfficeLib instance
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* @param path path to the file to load (in utf8)
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* @param progressFn callback for monitoring progress
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* @param errorFn callback for monitoring errors
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* @param cookie a pointer to pass back to the callbacks
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* @param pDoc address for return of a MuOfficeDoc object
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*
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* @return error indication - 0 for success
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*
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* The progress callback may be called several times, with increasing
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* values of pagesLoaded. Unless MuOfficeDoc_destroy is called,
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* before loading completes, a call with "completed" set to true
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* is guaranteed.
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*
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* Once MuOfficeDoc_destroy is called there will be no
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* further callbacks.
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*
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* Alternatively, in a synchronous context, MuOfficeDoc_getNumPages
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* can be called to wait for loading to complete and return the total
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* number of pages. In this mode of use, progressFn can be NULL.
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*/
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MuError MuOfficeLib_loadDocument(MuOfficeLib *mu,
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const char *path,
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MuOfficeLoadingProgressFn *progressFn,
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MuOfficeLoadingErrorFn *errorFn,
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void *cookie,
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MuOfficeDoc **pDoc);
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/**
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* Perform MuPDF native operations on a given MuOfficeLib
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* instance.
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*
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* The function is called with a fz_context value that can
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* be safely used (i.e. the context is cloned/dropped
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* appropriately around the call). The function should signal
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* errors by fz_throw-ing.
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*
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* @param mu the MuOfficeLib instance.
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* @param fn the function to call to run the operations.
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* @param arg Opaque data pointer.
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeLib_run(MuOfficeLib *mu, void (*fn)(fz_context *ctx, void *arg), void *arg);
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/**
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* Provide the password for a document
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*
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* This function should be called to provide a password with a document
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* error if MuOfficeError_PasswordRequired is received.
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*
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* If a password is requested again, this means the password was incorrect.
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*
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* @param doc the document object
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* @param password the password (UTF8 encoded)
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* @return error indication - 0 for success
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*/
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int MuOfficeDoc_providePassword(MuOfficeDoc *doc, const char *password);
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/**
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* Return the type of an open document
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*
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* @param doc the document object
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*
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* @return the document type
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*/
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MuOfficeDocType MuOfficeDoc_docType(MuOfficeDoc *doc);
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/**
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* Return the number of pages of a document
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*
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* This function waits for document loading to complete before returning
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* the result. It may block the calling thread for a significant period of
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* time. To avoid blocking, this call should be avoided in favour of using
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* the MuOfficeLib_loadDocument callbacks to monitor loading.
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*
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* If background loading fails, the associated error will be returned
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* from this call.
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*
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* @param doc the document
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* @param pNumPages address for return of the number of pages
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeDoc_getNumPages(MuOfficeDoc *doc, int *pNumPages);
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/**
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* Determine if the document has been modified
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*
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* @param doc the document
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*
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* @return modified flag
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*/
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int MuOfficeDoc_hasBeenModified(MuOfficeDoc *doc);
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/**
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* Start a save operation
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*
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* @param doc the document
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* @param path path of the file to which to save
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* @param resultFn callback used to report completion
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* @param cookie a pointer to pass to the callback
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeDoc_save(MuOfficeDoc *doc,
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const char *path,
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MuOfficeSaveResultFn *resultFn,
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void *cookie);
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/**
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* Stop a document loading. The document is not destroyed, but
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* no further content will be read from the file.
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*
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* @param doc the MuOfficeDoc object
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*/
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void MuOfficeDoc_abortLoad(MuOfficeDoc *doc);
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/**
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* Destroy a MuOfficeDoc object. Loading of the document is shutdown
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* and no further callbacks will be issued for the specified object.
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*
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* @param doc the MuOfficeDoc object
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*/
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void MuOfficeDoc_destroy(MuOfficeDoc *doc);
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/**
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* Get a page of a document
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*
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* @param doc the document object
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* @param pageNumber the number of the page to load (lying in the
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* range 0 to one less than the number of pages)
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* @param updateFn Function to be called back when the page updates
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* @param cookie Opaque value to pass for any updates
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* @param pPage Address for return of the page object
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeDoc_getPage( MuOfficeDoc *doc,
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int pageNumber,
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MuOfficePageUpdateFn *updateFn,
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void *cookie,
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MuOfficePage **pPage);
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/**
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* Perform MuPDF native operations on a given document.
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*
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* The function is called with fz_context and fz_document
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* values that can be safely used (i.e. the context is
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* cloned/dropped appropriately around the function, and
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* locking is used to ensure that no other threads are
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* simultaneously using the document). Functions can
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* signal errors by fz_throw-ing.
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*
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* Due to the locking, it is best to ensure that as little
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* time is taken here as possible (i.e. if you fetch some
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* data and then spend a long time processing it, it is
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* probably best to fetch the data using MuOfficeDoc_run
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* and then process it outside). This avoids potentially
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* blocking the UI.
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*
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* @param doc the document object.
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* @param fn the function to call with fz_context/fz_document
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* values.
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* @param arg Opaque data pointer.
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficeDoc_run(MuOfficeDoc *doc, void (*fn)(fz_context *ctx, fz_document *doc, void *arg), void *arg);
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/**
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* Destroy a page object
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*
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* Note this does not delete or remove the page from the document.
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* It simply destroys the page object which is merely a reference
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* to the page.
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*
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* @param page the page object
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*/
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void MuOfficePage_destroy(MuOfficePage *page);
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/**
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* Get the size of a page in pixels
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*
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* This returns the size of the page in pixels. Pages can be rendered
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* with a zoom factor. The returned value is the size of bitmap
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* appropriate for rendering with a zoom of 1.0 and corresponds to
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* 90 dpi. The returned values are not necessarily whole numbers.
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*
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* @param page the page object
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* @param pWidth address for return of the width
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* @param pHeight address for return of the height
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficePage_getSize( MuOfficePage *page,
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float *pWidth,
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float *pHeight);
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/**
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* Return the zoom factors necessary to render at to a given
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* size in pixels. (deprecated)
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*
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* @param page the page object
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* @param width the desired width
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* @param height the desired height
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* @param pXZoom Address for return of zoom necessary to fit width
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* @param pYZoom Address for return of zoom necessary to fit height
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficePage_calculateZoom( MuOfficePage *page,
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int width,
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int height,
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float *pXZoom,
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float *pYZoom);
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/**
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* Get the size of a page in pixels for a specified zoom factor
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* (deprecated)
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*
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* This returns the size of bitmap that should be used to display
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* the entire page at the given zoom factor. A zoom of 1.0
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* corresponds to 90 dpi.
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*
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* @param page the page object
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* @param zoom the zoom factor
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* @param pWidth address for return of the width
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* @param pHeight address for return of the height
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*
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* @return error indication - 0 for success
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*/
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MuError MuOfficePage_getSizeForZoom( MuOfficePage *page,
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float zoom,
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int *pWidth,
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int *pHeight);
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/**
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* Perform MuPDF native operations on a given page.
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*
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* The function is called with fz_context and fz_page
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* values that can be safely used (i.e. the context is
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* cloned/dropped appropriately around the function, and
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* locking is used to ensure that no other threads are
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||
* simultaneously using the document). Functions can
|
||
* signal errors by fz_throw-ing.
|
||
*
|
||
* Due to the locking, it is best to ensure that as little
|
||
* time is taken here as possible (i.e. if you fetch some
|
||
* data and then spend a long time processing it, it is
|
||
* probably best to fetch the data using MuOfficePage_run
|
||
* and then process it outside). This avoids potentially
|
||
* blocking the UI.
|
||
*
|
||
* @param page the page object.
|
||
* @param fn the function to call with fz_context/fz_document
|
||
* values.
|
||
* @param arg Opaque data pointer.
|
||
*
|
||
* @return error indication - 0 for success
|
||
*/
|
||
MuError MuOfficePage_run(MuOfficePage *page, void (*fn)(fz_context *ctx, fz_page *page, void *arg), void *arg);
|
||
|
||
/**
|
||
* Schedule the rendering of an area of document page to
|
||
* an area of a bitmap.
|
||
*
|
||
* The alignment between page and bitmap is defined by specifying
|
||
* document's origin within the bitmap, possibly either positive or
|
||
* negative. A render object is returned via which the process can
|
||
* be monitored or terminated.
|
||
*
|
||
* The progress function is called exactly once per render in either
|
||
* the success or failure case.
|
||
*
|
||
* Note that, since a render object represents a running thread that
|
||
* needs access to the page, document, and library objects, it is important
|
||
* to call MuOfficeRender_destroy, not only before using or deallocating
|
||
* the bitmap, but also before calling MuOfficePage_destroy, etc..
|
||
*
|
||
* @param page the page to render
|
||
* @param zoom the zoom factor
|
||
* @param bitmap the bitmap
|
||
* @param area area to render
|
||
* @param progressFn the progress callback function
|
||
* @param cookie a pointer to pass to the callback function
|
||
* @param pRender Address for return of the render object
|
||
*
|
||
* @return error indication - 0 for success
|
||
*/
|
||
MuError MuOfficePage_render( MuOfficePage *page,
|
||
float zoom,
|
||
const MuOfficeBitmap *bitmap,
|
||
const MuOfficeRenderArea *area,
|
||
MuOfficeRenderProgressFn *progressFn,
|
||
void *cookie,
|
||
MuOfficeRender **pRender);
|
||
|
||
/**
|
||
* Destroy a render
|
||
*
|
||
* This call destroys a MuOfficeRender object, aborting any current
|
||
* render.
|
||
*
|
||
* This call is intended to support an app dealing with a user quickly
|
||
* flicking through document pages. A render may be scheduled but, before
|
||
* completion, be found not to be needed. In that case the bitmap will
|
||
* need to be reused, which requires any existing render to be aborted.
|
||
* The call to MuOfficeRender_destroy will cut short the render and
|
||
* allow the bitmap to be reused immediately.
|
||
*
|
||
* @note If an active render thread is destroyed, it will be aborted.
|
||
* While fast, this is not an instant operation. For maximum
|
||
* responsiveness, it is best to 'abort' as soon as you realise you
|
||
* don't need the render, and to destroy when you get the callback.
|
||
*
|
||
* @param render The render object
|
||
*/
|
||
void MuOfficeRender_destroy(MuOfficeRender *render);
|
||
|
||
/**
|
||
* Abort a render
|
||
*
|
||
* This call aborts any rendering currently underway. The 'render
|
||
* complete' callback (if any) given when the render was created will
|
||
* still be called. If a render has completed, this call will have no
|
||
* effect.
|
||
*
|
||
* This call will not block to wait for the render thread to stop, but
|
||
* will cause it to stop as soon as it can in the background.
|
||
*
|
||
* @note It is important not to start any new render to the same bitmap
|
||
* until the callback comes in (or until waitUntilComplete returns), as
|
||
* otherwise you can have multiple renders drawing to the same bitmap
|
||
* with unpredictable consequences.
|
||
*
|
||
* @param render The render object to abort
|
||
*/
|
||
void MuOfficeRender_abort(MuOfficeRender *render);
|
||
|
||
/**
|
||
* Wait for a render to complete.
|
||
*
|
||
* This call will not return until rendering is complete, so on return
|
||
* the bitmap will contain the page image (assuming the render didn't
|
||
* run into an error condition) and will not be used further by any
|
||
* background processing. Any error during rendering will be returned
|
||
* from this function.
|
||
*
|
||
* This call may block the calling thread for a significant period of
|
||
* time. To avoid blocking, supply a progress-monitoring callback
|
||
* function to MuOfficePage_render.
|
||
*
|
||
* @param render The render object to destroy
|
||
* @return render error condition - 0 for no error.
|
||
*/
|
||
MuError MuOfficeRender_waitUntilComplete(MuOfficeRender *render);
|
||
|
||
#endif /* SMART_OFFICE_LIB_H */
|