First version of mu-office-lib.

1 files changed, 599 insertions, 0 deletions

diff --git a/include/mupdf/helpers/mu-office-lib.h b/include/mupdf/helpers/mu-office-lib.h
new file mode 100644
index 00000000..9c4cd845
--- /dev/null
+++ b/include/mupdf/helpers/mu-office-lib.h
@@ -0,0 +1,599 @@
+/**
+ * Mu Office Library
+ *
+ * This helper layer provides an API for loading, and displaying
+ * a file. It is deliberately as identical as possible to the
+ * smart-office-lib.h header file in Smart Office to facilitate
+ * a product which can use both Smart Office and MuPDF.
+ */
+
+#ifndef MU_OFFICE_LIB_H
+#define MU_OFFICE_LIB_H
+
+/*
+ * General use
+ *
+ * This library uses threads but is not thread safe for the caller. All
+ * calls should be made from a single thread. Some calls allow the user
+ * to arrange for their own functions to be called back from the library;
+ * often the users functions will be called back from a different thread. If
+ * a call into the library is required in response to information from a
+ * callback, it is the responsibility of the user to arrange for those
+ * library calls to be made on the same thread as for other library calls.
+ * Calls back into the library from a callback are not permitted.
+ *
+ * There are two main modes of use. In interactive windowing systems, it
+ * is usual for the app developers code to be called on the main UI thread.
+ * It is from the UI thread that all library calls should be made. Such
+ * systems usually provide a way to post a call onto the UI thread. That
+ * is the best way to respond to a callback from the library.
+ *
+ * The other mode of use is for plain executables that might wish to
+ * (say) generate images of all the pages of a document. This can
+ * be acheived, without use of callbacks, using the few synchronous
+ * calls. E.g., MuOfficeDoc_getNumPages will wait for background document
+ * loading to complete before returning the total number of pages and
+ * MuOfficeRender_destroy will wait for background rendering to complete
+ * before returning.
+ */
+
+#include <stddef.h> /* For size_t */
+
+/** Error type returned from most MuOffice functions
+ *
+ * 0 means no error
+ *
+ * non-zero values mean an error occurred. The exact value is an indication
+ * of what went wrong and should be included in bug reports or support
+ * queries. Library users should not test this value except for 0,
+ * non-zero and any explicitly documented values.
+ */
+typedef int MuError;
+
+
+/** Errors returned to MuOfficeLoadingErrorFn
+ *
+ * Other values may also be returned.
+ */
+typedef enum MuOfficeDocErrorType
+{
+	MuOfficeDocErrorType_NoError = 0,
+	MuOfficeDocErrorType_UnsupportedDocumentType = 1,
+	MuOfficeDocErrorType_EmptyDocument = 2,
+	MuOfficeDocErrorType_UnableToLoadDocument = 4,
+	MuOfficeDocErrorType_UnsupportedEncryption = 5,
+	MuOfficeDocErrorType_Aborted = 6,
+	MuOfficeDocErrorType_OutOfMemory = 7,
+
+	/* FIXME: Additional ones that should be backported to
+	 * smart-office-lib.h */
+	MuOfficeDocErrorType_IllegalArgument = 8,
+
+	/** A password is required to open this document.
+	 *
+	 * The app should provide it using MuOffice_providePassword
+	 * or if it doesn't want to proceed call MuOfficeDoc_destroy or
+	 * MuOfficeDoc_abortLoad.
+	 */
+	MuOfficeDocErrorType_PasswordRequest = 0x1000
+} MuOfficeDocErrorType;
+
+
+/**
+ *Structure holding the detail of the layout of a bitmap. b5g6r5 is assumed.
+ */
+typedef struct MuOfficeBitmap_s
+{
+	void *memptr;
+	int   width;
+	int   height;
+	int   lineSkip;
+} MuOfficeBitmap;
+
+
+/**
+ * Structure defining a point
+ *
+ *    x           x coord of point
+ *    y           y coord of point
+ */
+typedef struct MuOfficePoint_s
+{
+	float x;
+	float y;
+} MuOfficePoint;
+
+/**
+ * Structure defining a rectangle
+ *
+ *    x           x coord of top left of area within the page
+ *    y           y coord of top left of area within the page
+ *    width       width of area
+ *    height      height of area
+ */
+typedef struct MuOfficeBox_s
+{
+	float x;
+	float y;
+	float width;
+	float height;
+} MuOfficeBox;
+
+typedef enum MuOfficePointType
+{
+	MuOfficePointType_MoveTo,
+	MuOfficePointType_LineTo
+} MuOfficePointType;
+
+typedef struct MuOfficePathPoint
+{
+	float x;
+	float y;
+	MuOfficePointType type;
+} MuOfficePathPoint;
+
+/**
+ * Structure defining what area of a page should be rendered and to what
+ * area of the bitmap
+ *
+ *    origin            coordinates of the document origin within the bitmap
+ *    renderArea        the part of the bitmap to which to render
+ */
+typedef struct MuOfficeRenderArea_s
+{
+	MuOfficePoint   origin;
+	MuOfficeBox     renderArea;
+} MuOfficeRenderArea;
+
+
+typedef struct MuOfficeLib_s MuOfficeLib;
+typedef struct MuOfficeDoc_s MuOfficeDoc;
+typedef struct MuOfficePage_s MuOfficePage;
+typedef struct MuOfficeRender_s MuOfficeRender;
+
+/**
+ * Allocator function used by some functions to get blocks of memory.
+ *
+ * @param cookie     data pointer passed in with the allocator.
+ * @param size       the size of the required block.
+ *
+ * @returns as for malloc. (NULL implies OutOfMemory, or size == 0).
+ * Otherwise a pointer to an allocated block.
+ */
+typedef void *(MuOfficeAllocFn)(void   *cookie,
+				size_t  size);
+
+
+/**
+ * Callback function monitoring document loading
+ *
+ * Also called when the document is edited, either adding or
+ * removing pages, with the pagesLoaded value decreasing
+ * in the page-removal case.
+ *
+ * @param cookie        the data pointer that was originally passed
+ *                      to MuOfficeLib_loadDocument.
+ * @param pagesLoaded   the number of pages so far discovered.
+ * @param complete      whether loading has completed. If this flag
+ *                      is set, pagesLoaded is the actual number of
+ *                      pages in the document.
+ */
+typedef void (MuOfficeLoadingProgressFn)(void *cookie,
+					int   pagesLoaded,
+					int   complete);
+
+
+/**
+ * Callback function used to monitor errors in the process of loading
+ * a document.
+ *
+ * @param cookie        the data pointer that was originally passed
+ *                      to MuOfficeLib_loadDocument.
+ * @param error         the error being reported
+ */
+typedef void (MuOfficeLoadingErrorFn)(	void                 *cookie,
+					MuOfficeDocErrorType  error);
+
+
+
+/**
+ * Callback function used to monitor page changes
+ *
+ * @param cookie        the data pointer that was originally passed
+ *                      to MuOfficeDoc_getPage.
+ * @param area          the area that has changed.
+ */
+typedef void (MuOfficePageUpdateFn)(	void                 *cookie,
+					const MuOfficeBox *area);
+
+/**
+ * Callback function used to monitor a background render of a
+ * document page. The function is called exactly once.
+ *
+ * @param cookie        the data pointer that was originally passed
+ *                      to MuOfficeDoc_monitorRenderProgress.
+ * @param error         error returned from the rendering process
+ */
+typedef void (MuOfficeRenderProgressFn)(void    *cookie,
+					MuError  error);
+
+/**
+ * Document types
+ *
+ * Keep in sync with smart-office-lib.h
+ */
+typedef enum
+{
+	MuOfficeDocType_PDF,
+	MuOfficeDocType_XPS,
+	MuOfficeDocType_IMG
+} MuOfficeDocType;
+
+
+/**
+ * The possible results of a save operation
+ */
+typedef enum MuOfficeSaveResult
+{
+	MuOfficeSave_Succeeded,
+	MuOfficeSave_Error,
+	MuOfficeSave_Cancelled
+}
+MuOfficeSaveResult;
+
+
+/**
+ * Callback function used to monitor save operations.
+ *
+ * @param cookie        the data pointer that was oringinally passed to
+ *                      MuOfficeDoc_save.
+ * @param result        the result of the save operation
+ */
+typedef void (MuOfficeSaveResultFn)(	void                 *cookie,
+					MuOfficeSaveResult result);
+
+
+/**
+ * Create a MuOfficeLib instance.
+ *
+ * @param pMu       address of variable to
+ *                  receive the created instance
+ *
+ * @return          error indication - 0 for success
+ */
+MuError MuOfficeLib_create(MuOfficeLib **pMu);
+
+/**
+ * Destroy a MuOfficeLib instance
+ *
+ * @param mu        the instance to destroy
+ */
+void MuOfficeLib_destroy(MuOfficeLib *mu);
+
+/**
+ * Find the type of a file given it's filename extension.
+ *
+ * @param path      path to the file (in utf8)
+ *
+ * @return          a valid MuOfficeDocType value, or MuOfficeDocType_Other
+ */
+MuOfficeDocType MuOfficeLib_getDocTypeFromFileExtension(const char *path);
+
+/**
+ * Return a list of file extensions supported by Mu Office library.
+ *
+ * @return    comma-delimited list of extensions, without the leading ".".
+ *            The caller should free the returned pointer..
+ */
+char * MuOfficeLib_getSupportedFileExtensions(void);
+
+/**
+ * Load a document
+ *
+ * Call will return immediately, leaving the document loading
+ * in the background
+ *
+ * @param mu         a MuOfficeLib instance
+ * @param path       path to the file to load (in utf8)
+ * @param progressFn callback for monitoring progress
+ * @param errorFn    callback for monitoring errors
+ * @param cookie     a pointer to pass back to the callbacks
+ * @param pDoc       address for return of a MuOfficeDoc object
+ *
+ * @return          error indication - 0 for success
+ *
+ * The progress callback may be called several times, with increasing
+ * values of pagesLoaded. Unless MuOfficeDoc_destroy is called,
+ * before loading completes, a call with "completed" set to true
+ * is guaranteed.
+ *
+ * Once MuOfficeDoc_destroy is called there will be no
+ * further callbacks.
+ *
+ * Alternatively, in a synchronous context, MuOfficeDoc_getNumPages
+ * can be called to wait for loading to complete and return the total
+ * number of pages. In this mode of use, progressFn can be NULL. 
+ */
+MuError MuOfficeLib_loadDocument(MuOfficeLib              *mu,
+				const char                *path,
+				MuOfficeLoadingProgressFn *progressFn,
+				MuOfficeLoadingErrorFn    *errorFn,
+				void                      *cookie,
+				MuOfficeDoc              **pDoc);
+
+
+/**
+ * Provide the password for a document
+ *
+ * This function should be called to provide a password with a document
+ * error if MuOfficeError_PasswordRequired is received.
+ *
+ * If a password is requested again, this means the password was incorrect.
+ *
+ * @param doc         the document object
+ * @param password    the password (UTF8 encoded)
+ * @return            error indication - 0 for success
+ */
+int MuOfficeDoc_providePassword(MuOfficeDoc *doc, const char *password);
+
+
+/**
+ * Return the type of an open document
+ *
+ * @param doc         the document object
+ *
+ * @return            the document type
+ */
+MuOfficeDocType MuOfficeDoc_docType(MuOfficeDoc *doc);
+
+
+/**
+ * Return the number of pages of a document
+ *
+ * This function waits for document loading to complete before returning
+ * the result. It may block the calling thread for a signficant period of
+ * time. To avoid blocking, this call should be avoided in favour of using
+ * the MuOfficeLib_loadDocument callbacks to monitor loading.
+ *
+ * If background loading fails, the associated error will be returned
+ * from this call.
+ *
+ * @param doc         the document
+ * @param pNumPages   address for return of the number of pages
+ *
+ * @return            error indication - 0 for success
+ */
+MuError MuOfficeDoc_getNumPages(MuOfficeDoc *doc, int *pNumPages);
+
+
+/**
+ * Determine if the document has been modified
+ *
+ * @param doc         the document
+ *
+ * @return            modified flag
+ */
+int MuOfficeDoc_hasBeenModified(MuOfficeDoc *doc);
+
+
+/**
+ * Start a save operation
+ *
+ * @param doc         the document
+ * @param path        path of the file to which to save
+ * @param resultFn    callback used to report completion
+ * @param cookie      a pointer to pass to the callback
+ *
+ * @return            error indication - 0 for success
+ */
+MuError MuOfficeDoc_save(MuOfficeDoc         *doc,
+			const char           *path,
+			MuOfficeSaveResultFn *resultFn,
+			void                 *cookie);
+
+
+/**
+ * Stop a document loading. The document is not destroyed, but
+ * no further content will be read from the file.
+ *
+ * @param doc       the MuOfficeDoc object
+ */
+void MuOfficeDoc_abortLoad(MuOfficeDoc *doc);
+
+
+/**
+ * Destroy a MuOfficeDoc object. Loading of the document is shutdown
+ * and no further callbacks will be issued for the specified object.
+ *
+ * @param doc       the MuOfficeDoc object
+ */
+void MuOfficeDoc_destroy(MuOfficeDoc *doc);
+
+
+/**
+ * Get a page of a document
+ *
+ * @param doc          the document object
+ * @param pageNumber   the number of the page to load (lying in the
+ *                     range 0 to one less than the number of pages)
+ * @param updateFn     Function to be called back when the page updates
+ * @param cookie       Opaque value to pass for any updates
+ * @param pPage        Address for return of the page object
+ *
+ * @return             error indication - 0 for success
+ */
+MuError MuOfficeDoc_getPage(	MuOfficeDoc          *doc,
+				int                   pageNumber,
+				MuOfficePageUpdateFn *updateFn,
+				void                 *cookie,
+				MuOfficePage        **pPage);
+
+
+/**
+ * Destroy a page object
+ *
+ * Note this does not delete or remove the page from the document.
+ * It simply destroys the page object which is merely a reference
+ * to the page.
+ *
+ * @param page         the page object
+ */
+void MuOfficePage_destroy(MuOfficePage *page);
+
+
+/**
+ * Get the size of a page in pixels
+ *
+ * This returns the size of the page in pixels. Pages can be rendered
+ * with a zoom factor. The returned value is the size of bitmap
+ * appropriate for rendering with a zoom of 1.0 and corresponds to
+ * 90 dpi. The returned values are not necessarily whole numbers.
+ *
+ * @param page         the page object
+ * @param pWidth       address for return of the width
+ * @param pHeight      address for return of the height
+ *
+ * @return             error indication - 0 for success
+ */
+MuError MuOfficePage_getSize(	MuOfficePage *page,
+				float        *pWidth,
+				float        *pHeight);
+
+
+/**
+ * Return the zoom factors necessary to render at to a given
+ * size in pixels. (deprecated)
+ *
+ * @param page         the page object
+ * @param width        the desired width
+ * @param height       the desired height
+ * @param pXZoom       Address for return of zoom necessary to fit width
+ * @param pYZoom       Address for return of zoom necessary to fit height
+ *
+ * @return             error indication - 0 for success
+ */
+MuError MuOfficePage_calculateZoom(	MuOfficePage *page,
+					int           width,
+					int           height,
+					float        *pXZoom,
+					float        *pYZoom);
+
+
+/**
+ * Get the size of a page in pixels for a specified zoom factor
+ * (deprecated)
+ *
+ * This returns the size of bitmap that should be used to display
+ * the entire page at the given zoom factor. A zoom of 1.0
+ * corresponds to 90 dpi.
+ *
+ * @param page         the page object
+ * @param zoom         the zoom factor
+ * @param pWidth       address for return of the width
+ * @param pHeight      address for return of the height
+ *
+ * @return             error indication - 0 for success
+ */
+MuError MuOfficePage_getSizeForZoom(	MuOfficePage *page,
+					float         zoom,
+					int          *pWidth,
+					int          *pHeight);
+
+
+/**
+ * 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 sheduled 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 */