public/fpdf_edit.h

// 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 PUBLIC_FPDF_EDIT_H_
#define PUBLIC_FPDF_EDIT_H_

#include <stdint.h>

#include "fpdfview.h"

#define FPDF_ARGB(a, r, g, b)                                      \
  ((uint32_t)(((uint32_t)(b)&0xff) | (((uint32_t)(g)&0xff) << 8) | \
              (((uint32_t)(r)&0xff) << 16) | (((uint32_t)(a)&0xff) << 24)))
#define FPDF_GetBValue(argb) ((uint8_t)(argb))
#define FPDF_GetGValue(argb) ((uint8_t)(((uint16_t)(argb)) >> 8))
#define FPDF_GetRValue(argb) ((uint8_t)((argb) >> 16))
#define FPDF_GetAValue(argb) ((uint8_t)((argb) >> 24))

// The page object constants.
#define FPDF_PAGEOBJ_TEXT 1
#define FPDF_PAGEOBJ_PATH 2
#define FPDF_PAGEOBJ_IMAGE 3
#define FPDF_PAGEOBJ_SHADING 4
#define FPDF_PAGEOBJ_FORM 5

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

// Create a new PDF document.
//
// Returns a handle to a new document, or NULL on failure.
DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_CreateNewDocument();

// Create a new PDF page.
//
//   document   - handle to document.
//   page_index - the index of the page to create.
//   width      - the page width.
//   height     - the page height.
//
// Returns the handle to the new page.
//
// The page should be deleted with |FPDFPage_Delete| when finished.
DLLEXPORT FPDF_PAGE STDCALL FPDFPage_New(FPDF_DOCUMENT document,
                                         int page_index,
                                         double width,
                                         double height);

// Delete the page at |page_index|.
//
//   document   - handle to document.
//   page_index - the index of the page to delete.
DLLEXPORT void STDCALL FPDFPage_Delete(FPDF_DOCUMENT document, int page_index);

// Get the rotation of |page|.
//
//   page - handle to a page
//
// Returns one of the following indicating the page rotation:
//   0 - No rotation.
//   1 - Rotated 90 degrees clockwise.
//   2 - Rotated 180 degrees clockwise.
//   3 - Rotated 270 degrees clockwise.
DLLEXPORT int STDCALL FPDFPage_GetRotation(FPDF_PAGE page);

// Set rotation for |page|.
//
//   page   - handle to a page.
//   rotate - the rotation value, one of:
//              0 - No rotation.
//              1 - Rotated 90 degrees clockwise.
//              2 - Rotated 180 degrees clockwise.
//              3 - Rotated 270 degrees clockwise.
DLLEXPORT void STDCALL FPDFPage_SetRotation(FPDF_PAGE page, int rotate);

// Insert |page_obj| into |page|.
//
//   page     - handle to a page
//   page_obj - handle to a page object. The |page_obj| will be automatically
//              freed.
DLLEXPORT void STDCALL FPDFPage_InsertObject(FPDF_PAGE page,
                                             FPDF_PAGEOBJECT page_obj);

// Get number of page objects inside |page|.
//
//   page - handle to a page.
//
// Returns the number of objects in |page|.
DLLEXPORT int STDCALL FPDFPage_CountObject(FPDF_PAGE page);

// Get object in |page| at |index|.
//
//   page  - handle to a page.
//   index - the index of a page object.
//
// Returns the handle to the page object, or NULL on failed.
DLLEXPORT FPDF_PAGEOBJECT STDCALL FPDFPage_GetObject(FPDF_PAGE page, int index);

// Checks if |page| contains transparency.
//
//   page - handle to a page.
//
// Returns TRUE if |page| contains transparency.
DLLEXPORT FPDF_BOOL STDCALL FPDFPage_HasTransparency(FPDF_PAGE page);

// Generate the content of |page|.
//
//   page - handle to a page.
//
// Returns TRUE on success.
//
// Before you save the page to a file, or reload the page, you must call
// |FPDFPage_GenerateContent| or any changes to |page| will be lost.
DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GenerateContent(FPDF_PAGE page);

// Checks if |pageObject| contains transparency.
//
//   pageObject - handle to a page object.
//
// Returns TRUE if |pageObject| contains transparency.
DLLEXPORT FPDF_BOOL STDCALL
FPDFPageObj_HasTransparency(FPDF_PAGEOBJECT pageObject);

// Transform |pageObject| by the given matrix.
//
//   page_object - handle to a page object.
//   a           - matrix value.
//   b           - matrix value.
//   c           - matrix value.
//   d           - matrix value.
//   e           - matrix value.
//   f           - matrix value.
//
// The matrix is composed as:
//   |a c e|
//   |b d f|
// and can be used to scale, rotate, shear and translate the |page_object|.
DLLEXPORT void STDCALL FPDFPageObj_Transform(FPDF_PAGEOBJECT page_object,
                                             double a,
                                             double b,
                                             double c,
                                             double d,
                                             double e,
                                             double f);

// Transform all annotations in |page|.
//
//   page - handle to a page.
//   a    - matrix value.
//   b    - matrix value.
//   c    - matrix value.
//   d    - matrix value.
//   e    - matrix value.
//   f    - matrix value.
//
// The matrix is composed as:
//   |a c e|
//   |b d f|
// and can be used to scale, rotate, shear and translate the |page| annotations.
DLLEXPORT void STDCALL FPDFPage_TransformAnnots(FPDF_PAGE page,
                                                double a,
                                                double b,
                                                double c,
                                                double d,
                                                double e,
                                                double f);

// Create a new image object.
//
//   document - handle to a document.
//
// Returns a handle to a new image object.
DLLEXPORT FPDF_PAGEOBJECT STDCALL
FPDFPageObj_NewImgeObj(FPDF_DOCUMENT document);

// Load an image from a JPEG image file and then set it into |image_object|.
//
//   pages        - pointer to the start of all loaded pages, may be NULL.
//   nCount       - number of |pages|, may be 0.
//   image_object - handle to an image object.
//   fileAccess   - file access handler which specifies the JPEG image file.
//
// Returns TRUE on success.
//
// The image object might already have an associated image, which is shared and
// cached by the loaded pages. In that case, we need to clear the cached image
// for all the loaded pages. Pass |pages| and page count (|nCount|) to this API
// to clear the image cache. If the image is not previously shared, or NULL is a
// valid |pages| value.
DLLEXPORT FPDF_BOOL STDCALL
FPDFImageObj_LoadJpegFile(FPDF_PAGE* pages,
                          int nCount,
                          FPDF_PAGEOBJECT image_object,
                          FPDF_FILEACCESS* fileAccess);

// Set the transform matrix of |image_object|.
//
//   image_object - handle to an image object.
//   a            - matrix value.
//   b            - matrix value.
//   c            - matrix value.
//   d            - matrix value.
//   e            - matrix value.
//   f            - matrix value.
//
// The matrix is composed as:
//   |a c e|
//   |b d f|
// and can be used to scale, rotate, shear and translate the |page| annotations.
//
// Returns TRUE on success.
DLLEXPORT FPDF_BOOL STDCALL FPDFImageObj_SetMatrix(FPDF_PAGEOBJECT image_object,
                                                   double a,
                                                   double b,
                                                   double c,
                                                   double d,
                                                   double e,
                                                   double f);

// Set |bitmap| to |image_object|.
//
//   pages        - pointer to the start of all loaded pages, may be NULL.
//   nCount       - number of |pages|, may be 0.
//   image_object - handle to an image object.
//   bitmap       - handle of the bitmap.
//
// Returns TRUE on success.
DLLEXPORT FPDF_BOOL STDCALL FPDFImageObj_SetBitmap(FPDF_PAGE* pages,
                                                   int nCount,
                                                   FPDF_PAGEOBJECT image_object,
                                                   FPDF_BITMAP bitmap);

#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus

#endif  // PUBLIC_FPDF_EDIT_H_