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authorDan Sinclair <dsinclair@chromium.org>2015-10-20 15:18:51 -0400
committerDan Sinclair <dsinclair@chromium.org>2015-10-20 15:18:51 -0400
commit49f88b708d905b052bc00769ac7cb48202cac019 (patch)
tree1e0088f4b807e1747c8c0b2031b189304471041b /public/fpdfview.h
parent23378cdf2c0be861bddfffd82aed8cd6b07d77bf (diff)
downloadpdfium-49f88b708d905b052bc00769ac7cb48202cac019.tar.xz
[Merge to XFA] Minor documentation updates for fpdfview.h.
This does some minor copy editing and formatting of the documentation in the fpdfview.h header. R=tsepez@chromium.org Review URL: https://codereview.chromium.org/1411863004 . (cherry picked from commit 19169dae5bf92813b7419793f61dfca8b4fb9124) Review URL: https://codereview.chromium.org/1420593002 .
Diffstat (limited to 'public/fpdfview.h')
-rw-r--r--public/fpdfview.h637
1 files changed, 299 insertions, 338 deletions
diff --git a/public/fpdfview.h b/public/fpdfview.h
index f899709873..fb514864a2 100644
--- a/public/fpdfview.h
+++ b/public/fpdfview.h
@@ -67,37 +67,30 @@ typedef char const* FPDF_LPCSTR;
// encoded), and platform dependent string
typedef const char* FPDF_BYTESTRING;
-typedef const unsigned short*
- FPDF_WIDESTRING; // Foxit PDF SDK always use UTF-16LE encoding wide string,
-// each character use 2 bytes (except surrogation), with low byte first.
+// FPDFSDK always uses UTF-16LE encoded wide strings, each character uses 2
+// bytes (except surrogation), with the low byte first.
+typedef const unsigned short* FPDF_WIDESTRING;
#ifndef _FPDF_DEF_STR_
#define _FPDF_DEF_STR_
-/** @brief Structure for byte string.
- *
- * @note In SDK, a byte string commonly means a UTF-16LE format string.
- */
+// Structure for a byte string.
+// Note, a byte string commonly means a UTF-16LE formated string.
typedef struct _FPDF_BSTR {
- /**
- * @brief String buffer.
- */
+ // String buffer.
char* str;
- /**
- * @brief Length of a string, in bytes.
- */
+ // Length of the string, in bytes.
int len;
} FPDF_BSTR;
#endif
-// For Windows programmers: for most case it's OK to treat FPDF_WIDESTRING as
-// Windows unicode string,
-// however, special care needs to be taken if you expect to process
-// Unicode larger than 0xffff.
-// For Linux/Unix programmers: most compiler/library environment uses 4 bytes
-// for a Unicode character,
-// you have to convert between FPDF_WIDESTRING and system wide string by
-// yourself.
+// For Windows programmers: In most cases it's OK to treat FPDF_WIDESTRING as a
+// Windows unicode string, however, special care needs to be taken if you
+// expect to process Unicode larger than 0xffff.
+//
+// For Linux/Unix programmers: most compiler/library environments use 4 bytes
+// for a Unicode character, and you have to convert between FPDF_WIDESTRING and
+// system wide string by yourself.
#ifdef _WIN32_WCE
typedef const unsigned short* FPDF_STRING;
@@ -105,30 +98,29 @@ typedef const unsigned short* FPDF_STRING;
typedef const char* FPDF_STRING;
#endif
-/** @brief Matrix for transformation. */
+// Matrix for transformation.
typedef struct _FS_MATRIX_ {
- float a; /**< @brief Coefficient a.*/
- float b; /**< @brief Coefficient b.*/
- float c; /**< @brief Coefficient c.*/
- float d; /**< @brief Coefficient d.*/
- float e; /**< @brief Coefficient e.*/
- float f; /**< @brief Coefficient f.*/
+ float a;
+ float b;
+ float c;
+ float d;
+ float e;
+ float f;
} FS_MATRIX;
-/** @brief Rectangle area(float) in device or page coordination system. */
+// Rectangle area(float) in device or page coordinate system.
typedef struct _FS_RECTF_ {
- /**@{*/
- /** @brief The x-coordinate of the left-top corner. */
+ // The x-coordinate of the left-top corner.
float left;
- /** @brief The y-coordinate of the left-top corner. */
+ // The y-coordinate of the left-top corner.
float top;
- /** @brief The x-coordinate of the right-bottom corner. */
+ // The x-coordinate of the right-bottom corner.
float right;
- /** @brief The y-coordinate of the right-bottom corner. */
+ // The y-coordinate of the right-bottom corner.
float bottom;
- /**@}*/
} * FS_LPRECTF, FS_RECTF;
-/** @brief Const Pointer to ::FS_RECTF structure.*/
+
+// Const Pointer to FS_RECTF structure.
typedef const FS_RECTF* FS_LPCRECTF;
#if defined(_WIN32) && defined(FPDFSDK_EXPORTS)
@@ -156,7 +148,7 @@ extern "C" {
// backwards comatibility purposes.
DLLEXPORT void STDCALL FPDF_InitLibrary();
-// Process-wide options for initializing library.
+// Process-wide options for initializing the library.
typedef struct FPDF_LIBRARY_CONFIG_ {
// Version number of the interface. Currently must be 2.
int version;
@@ -182,7 +174,7 @@ typedef struct FPDF_LIBRARY_CONFIG_ {
// Function: FPDF_InitLibraryWithConfig
// Initialize the FPDFSDK library
// Parameters:
-// cfg - configuration information as above.
+// config - configuration information as above.
// Return value:
// None.
// Comments:
@@ -200,8 +192,8 @@ FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* config);
// Comments:
// You can call this function to release all memory blocks allocated by
// the library.
-// After this function called, you should not call any PDF processing
-// functions.
+// After this function is called, you should not call any PDF
+// processing functions.
DLLEXPORT void STDCALL FPDF_DestroyLibrary();
// Policy for accessing the local machine time.
@@ -210,9 +202,9 @@ DLLEXPORT void STDCALL FPDF_DestroyLibrary();
// Function: FPDF_SetSandBoxPolicy
// Set the policy for the sandbox environment.
// Parameters:
-// policy - The specified policy for setting, for
-// example:FPDF_POLICY_MACHINETIME_ACCESS.
-// enable - True for enable, False for disable the policy.
+// policy - The specified policy for setting, for example:
+// FPDF_POLICY_MACHINETIME_ACCESS.
+// enable - True to enable, false to disable the policy.
// Return value:
// None.
DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
@@ -221,9 +213,9 @@ DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
// Function: FPDF_LoadDocument
// Open and load a PDF document.
// Parameters:
-// file_path [in] - Path to the PDF file (including extension).
-// password [in] - A string used as the password for PDF file.
-// If no password needed, empty or NULL can be used.
+// file_path - Path to the PDF file (including extension).
+// password - A string used as the password for the PDF file.
+// If no password is needed, empty or NULL can be used.
// Return value:
// A handle to the loaded document, or NULL on failure.
// Comments:
@@ -241,20 +233,18 @@ DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path,
// Parameters:
// data_buf - Pointer to a buffer containing the PDF document.
// size - Number of bytes in the PDF document.
-// password - A string used as the password for PDF file.
-// If no password needed, empty or NULL can be used.
+// password - A string used as the password for the PDF file.
+// If no password is needed, empty or NULL can be used.
// Return value:
-// A handle to the loaded document. If failed, NULL is returned.
+// A handle to the loaded document, or NULL on failure.
// Comments:
// The memory buffer must remain valid when the document is open.
-// Loaded document can be closed by FPDF_CloseDocument.
+// The loaded document can be closed by FPDF_CloseDocument.
// If this function fails, you can use FPDF_GetLastError() to retrieve
-// the reason why it fails.
+// the reason why it failed.
// Notes:
-// The application should call ::FPDF_LoadXFA function after PDF
-// document loaded
-// to support XFA fields in fpdfformfill.h file.
-//
+// The application should call FPDF_LoadXFA function after the
+// document is loaded to support form fields.
DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf,
int size,
FPDF_BYTESTRING password);
@@ -264,19 +254,19 @@ typedef struct {
// File length, in bytes.
unsigned long m_FileLen;
- // A function pointer for getting a block of data from specific position.
- // Position is specified by byte offset from beginning of the file.
- // The position and size will never go out range of file length.
+ // A function pointer for getting a block of data from a specific position.
+ // Position is specified by byte offset from the beginning of the file.
+ // The position and size will never go out of range of the file length.
// It may be possible for FPDFSDK to call this function multiple times for
- // same position.
+ // the same position.
// Return value: should be non-zero if successful, zero for error.
int (*m_GetBlock)(void* param,
unsigned long position,
unsigned char* pBuf,
unsigned long size);
- // A custom pointer for all implementation specific data.
- // This pointer will be used as the first parameter to m_GetBlock callback.
+ // A custom pointer for all implementation specific data. This pointer will
+ // be used as the first parameter to the m_GetBlock callback.
void* m_Param;
} FPDF_FILEACCESS;
@@ -362,34 +352,32 @@ typedef struct _FPDF_FILEHANDLER {
// Function: FPDF_LoadCustomDocument
// Load PDF document from a custom access descriptor.
// Parameters:
-// pFileAccess - A structure for access the file.
+// pFileAccess - A structure for accessing the file.
// password - Optional password for decrypting the PDF file.
// Return value:
-// A handle to the loaded document. If failed, NULL is returned.
+// A handle to the loaded document, or NULL on failure.
// Comments:
-// The application should maintain the file resources being valid until
-// the PDF document close.
-// Loaded document can be closed by FPDF_CloseDocument.
-// Notes:
-// The application should call ::FPDF_LoadXFA function after PDF
-// document loaded
-// to support XFA fields in fpdfformfill.h file.
+// The application must keep the file resources valid until the PDF
+// document is closed.
//
+// The loaded document can be closed with FPDF_CloseDocument.
+// Notes:
+// The application should call the FPDF_LoadXFA function after the
+// document is loaded to support form fields.
DLLEXPORT FPDF_DOCUMENT STDCALL
FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess, FPDF_BYTESTRING password);
// Function: FPDF_GetFileVersion
-// Get the file version of the specific PDF document.
+// Get the file version of the given PDF document.
// Parameters:
-// doc - Handle to document.
+// doc - Handle to a document.
// fileVersion - The PDF file version. File version: 14 for 1.4, 15
-// for 1.5, ...
+// for 1.5, ...
// Return value:
-// TRUE if this call succeed, If failed, FALSE is returned.
+// True if succeeds, false otherwise.
// Comments:
-// If the document is created by function ::FPDF_CreateNewDocument,
-// then this function would always fail.
-//
+// If the document was created by FPDF_CreateNewDocument,
+// then this function will always fail.
DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
int* fileVersion);
@@ -404,153 +392,146 @@ DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
#define FPDF_ERR_XFALAYOUT 8 // Layout XFA error.
// Function: FPDF_GetLastError
-// Get last error code when an SDK function failed.
+// Get last error code when a function fails.
// Parameters:
// None.
// Return value:
-// A 32-bit integer indicating error codes (defined above).
+// A 32-bit integer indicating error code as defined above.
// Comments:
// If the previous SDK call succeeded, the return value of this
-// function
-// is not defined.
-//
+// function is not defined.
DLLEXPORT unsigned long STDCALL FPDF_GetLastError();
// Function: FPDF_GetDocPermission
// Get file permission flags of the document.
// Parameters:
-// document - Handle to document. Returned by FPDF_LoadDocument
-// function.
+// document - Handle to a document. Returned by FPDF_LoadDocument.
// Return value:
-// A 32-bit integer indicating permission flags. Please refer to PDF
-// Reference for
-// detailed description. If the document is not protected, 0xffffffff
-// will be returned.
-//
+// A 32-bit integer indicating permission flags. Please refer to the
+// PDF Reference for detailed descriptions. If the document is not
+// protected, 0xffffffff will be returned.
DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document);
// Function: FPDF_GetSecurityHandlerRevision
-// Get the revision for security handler.
+// Get the revision for the security handler.
// Parameters:
-// document - Handle to document. Returned by FPDF_LoadDocument
-// function.
+// document - Handle to a document. Returned by FPDF_LoadDocument.
// Return value:
-// The security handler revision number. Please refer to PDF Reference
-// for
-// detailed description. If the document is not protected, -1 will be
-// returned.
-//
+// The security handler revision number. Please refer to the PDF
+// Reference for a detailed description. If the document is not
+// protected, -1 will be returned.
DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document);
// Function: FPDF_GetPageCount
-// Get total number of pages in a document.
+// Get total number of pages in the document.
// Parameters:
-// document - Handle to document. Returned by FPDF_LoadDocument
-// function.
+// document - Handle to document. Returned by FPDF_LoadDocument.
// Return value:
// Total number of pages in the document.
-//
DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document);
// Function: FPDF_LoadPage
-// Load a page inside a document.
+// Load a page inside the document.
// Parameters:
// document - Handle to document. Returned by FPDF_LoadDocument
-// function.
// page_index - Index number of the page. 0 for the first page.
// Return value:
-// A handle to the loaded page. If failed, NULL is returned.
+// A handle to the loaded page, or NULL if page load fails.
// Comments:
-// Loaded page can be rendered to devices using FPDF_RenderPage
-// function.
-// Loaded page can be closed by FPDF_ClosePage.
-//
+// The loaded page can be rendered to devices using FPDF_RenderPage.
+// The loaded page can be closed using FPDF_ClosePage.
DLLEXPORT FPDF_PAGE STDCALL FPDF_LoadPage(FPDF_DOCUMENT document,
int page_index);
// Function: FPDF_GetPageWidth
// Get page width.
// Parameters:
-// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
+// page - Handle to the page. Returned by FPDF_LoadPage.
// Return value:
// Page width (excluding non-displayable area) measured in points.
// One point is 1/72 inch (around 0.3528 mm).
-//
DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page);
// Function: FPDF_GetPageHeight
// Get page height.
// Parameters:
-// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
+// page - Handle to the page. Returned by FPDF_LoadPage.
// Return value:
// Page height (excluding non-displayable area) measured in points.
// One point is 1/72 inch (around 0.3528 mm)
-//
DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page);
// Function: FPDF_GetPageSizeByIndex
-// Get the size of a page by index.
+// Get the size of the page at the given index.
// Parameters:
-// document - Handle to document. Returned by FPDF_LoadDocument
-// function.
+// document - Handle to document. Returned by FPDF_LoadDocument.
// page_index - Page index, zero for the first page.
-// width - Pointer to a double value receiving the page width
-// (in points).
-// height - Pointer to a double value receiving the page height
-// (in points).
+// width - Pointer to a double to receive the page width
+// (in points).
+// height - Pointer to a double to receive the page height
+// (in points).
// Return value:
// Non-zero for success. 0 for error (document or page not found).
-//
DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
int page_index,
double* width,
double* height);
-// Page rendering flags. They can be combined with bit OR.
-#define FPDF_ANNOT 0x01 // Set if annotations are to be rendered.
-#define FPDF_LCD_TEXT \
- 0x02 // Set if using text rendering optimized for LCD display.
-#define FPDF_NO_NATIVETEXT \
- 0x04 // Don't use the native text output available on some platforms
-#define FPDF_GRAYSCALE 0x08 // Grayscale output.
-#define FPDF_DEBUG_INFO 0x80 // Set if you want to get some debug info.
-// Please discuss with Foxit first if you need to collect debug info.
-#define FPDF_NO_CATCH 0x100 // Set if you don't want to catch exception.
-#define FPDF_RENDER_LIMITEDIMAGECACHE 0x200 // Limit image cache size.
-#define FPDF_RENDER_FORCEHALFTONE \
- 0x400 // Always use halftone for image stretching.
-#define FPDF_PRINTING 0x800 // Render for printing.
-#define FPDF_REVERSE_BYTE_ORDER \
- 0x10 // set whether render in a reverse Byte order, this flag only
-// enable when render to a bitmap.
+// Page rendering flags. They can be combined with bit-wise OR.
+//
+// Set if annotations are to be rendered.
+#define FPDF_ANNOT 0x01
+// Set if using text rendering optimized for LCD display.
+#define FPDF_LCD_TEXT 0x02
+// Don't use the native text output available on some platforms
+#define FPDF_NO_NATIVETEXT 0x04
+// Grayscale output.
+#define FPDF_GRAYSCALE 0x08
+// Set if you want to get some debug info.
+#define FPDF_DEBUG_INFO 0x80
+// Set if you don't want to catch exceptions.
+#define FPDF_NO_CATCH 0x100
+// Limit image cache size.
+#define FPDF_RENDER_LIMITEDIMAGECACHE 0x200
+// Always use halftone for image stretching.
+#define FPDF_RENDER_FORCEHALFTONE 0x400
+// Render for printing.
+#define FPDF_PRINTING 0x800
+// Set to disable anti-aliasing on text.
+#define FPDF_RENDER_NO_SMOOTHTEXT 0x1000
+// Set to disable anti-aliasing on images.
+#define FPDF_RENDER_NO_SMOOTHIMAGE 0x2000
+// Set to disable anti-aliasing on paths.
+#define FPDF_RENDER_NO_SMOOTHPATH 0x4000
+// Set whether to render in a reverse Byte order, this flag is only used when
+// rendering to a bitmap.
+#define FPDF_REVERSE_BYTE_ORDER 0x10
+
#ifdef _WIN32
// Function: FPDF_RenderPage
-// Render contents in a page to a device (screen, bitmap, or printer).
-// This function is only supported on Windows system.
-// Parameters:
-// dc - Handle to device context.
-// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
-// start_x - Left pixel position of the display area in the
-// device coordinate.
-// start_y - Top pixel position of the display area in the device
-// coordinate.
+// Render contents of a page to a device (screen, bitmap, or printer).
+// This function is only supported on Windows.
+// Parameters:
+// dc - Handle to the device context.
+// page - Handle to the page. Returned by FPDF_LoadPage.
+// start_x - Left pixel position of the display area in
+// device coordinates.
+// start_y - Top pixel position of the display area in device
+// coordinates.
// size_x - Horizontal size (in pixels) for displaying the page.
// size_y - Vertical size (in pixels) for displaying the page.
-// rotate - Page orientation: 0 (normal), 1 (rotated 90 degrees
-// clockwise),
-// 2 (rotated 180 degrees), 3 (rotated 90 degrees
-// counter-clockwise).
+// rotate - Page orientation:
+// 0 (normal)
+// 1 (rotated 90 degrees clockwise)
+// 2 (rotated 180 degrees)
+// 3 (rotated 90 degrees counter-clockwise)
// flags - 0 for normal display, or combination of flags
-// defined above.
+// defined above.
// Return value:
// None.
// Notes:
-// The method can not support to render the page for the document
-// consists of dynamic XFA fields.
-//
+// FPDF_RenderPage can not be used if the document contains dynamic
+// form fields.
DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc,
FPDF_PAGE page,
int start_x,
@@ -562,32 +543,30 @@ DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc,
#endif
// Function: FPDF_RenderPageBitmap
-// Render contents in a page to a device independent bitmap
+// Render contents of a page to a device independent bitmap.
// Parameters:
// bitmap - Handle to the device independent bitmap (as the
-// output buffer).
-// Bitmap handle can be created by FPDFBitmap_Create
-// function.
+// output buffer). The bitmap handle can be created
+// by FPDFBitmap_Create.
// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
-// start_x - Left pixel position of the display area in the
-// bitmap coordinate.
-// start_y - Top pixel position of the display area in the bitmap
-// coordinate.
+// start_x - Left pixel position of the display area in
+// bitmap coordinates.
+// start_y - Top pixel position of the display area in bitmap
+// coordinates.
// size_x - Horizontal size (in pixels) for displaying the page.
// size_y - Vertical size (in pixels) for displaying the page.
-// rotate - Page orientation: 0 (normal), 1 (rotated 90 degrees
-// clockwise),
-// 2 (rotated 180 degrees), 3 (rotated 90 degrees
-// counter-clockwise).
+// rotate - Page orientation:
+// 0 (normal)
+// 1 (rotated 90 degrees clockwise)
+// 2 (rotated 180 degrees)
+// 3 (rotated 90 degrees counter-clockwise)
// flags - 0 for normal display, or combination of flags
-// defined above.
+// defined above.
// Return value:
// None.
// Notes:
-// The method can not support to render the page for the document
-// consists of dynamic XFA fields.
-//
+// FPDF_RenderPageBitmap can not be used if the document contains
+// dynamic form fields.
DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
FPDF_PAGE page,
int start_x,
@@ -603,7 +582,6 @@ DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
// page - Handle to the loaded page.
// Return value:
// None.
-//
DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page);
// Function: FPDF_CloseDocument
@@ -612,51 +590,48 @@ DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page);
// document - Handle to the loaded document.
// Return value:
// None.
-//
DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document);
// Function: FPDF_DeviceToPage
-// Convert the screen coordinate of a point to page coordinate.
+// Convert the screen coordinates of a point to page coordinates.
// Parameters:
-// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
-// start_x - Left pixel position of the display area in the
-// device coordinate.
-// start_y - Top pixel position of the display area in the device
-// coordinate.
+// page - Handle to the page. Returned by FPDF_LoadPage.
+// start_x - Left pixel position of the display area in
+// device coordinates.
+// start_y - Top pixel position of the display area in device
+// coordinates.
// size_x - Horizontal size (in pixels) for displaying the page.
// size_y - Vertical size (in pixels) for displaying the page.
-// rotate - Page orientation: 0 (normal), 1 (rotated 90 degrees
-// clockwise),
-// 2 (rotated 180 degrees), 3 (rotated 90 degrees
-// counter-clockwise).
-// device_x - X value in device coordinate, for the point to be
-// converted.
-// device_y - Y value in device coordinate, for the point to be
-// converted.
-// page_x - A Pointer to a double receiving the converted X
-// value in page coordinate.
-// page_y - A Pointer to a double receiving the converted Y
-// value in page coordinate.
+// rotate - Page orientation:
+// 0 (normal)
+// 1 (rotated 90 degrees clockwise)
+// 2 (rotated 180 degrees)
+// 3 (rotated 90 degrees counter-clockwise)
+// device_x - X value in device coordinates to be converted.
+// device_y - Y value in device coordinates to be converted.
+// page_x - A pointer to a double receiving the converted X
+// value in page coordinates.
+// page_y - A pointer to a double receiving the converted Y
+// value in page coordinates.
// Return value:
// None.
// Comments:
-// The page coordinate system has its origin at left-bottom corner of
-// the page, with X axis goes along
-// the bottom side to the right, and Y axis goes along the left side
-// upward. NOTE: this coordinate system
-// can be altered when you zoom, scroll, or rotate a page, however, a
-// point on the page should always have
+// The page coordinate system has its origin at the left-bottom corner
+// of the page, with the X-axis on the bottom going to the right, and
+// the Y-axis on the left side going up.
+//
+// NOTE: this coordinate system can be altered when you zoom, scroll,
+// or rotate a page, however, a point on the page should always have
// the same coordinate values in the page coordinate system.
//
// The device coordinate system is device dependent. For screen device,
-// its origin is at left-top
-// corner of the window. However this origin can be altered by Windows
-// coordinate transformation
-// utilities. You must make sure the start_x, start_y, size_x, size_y
-// and rotate parameters have exactly
-// same values as you used in FPDF_RenderPage() function call.
+// its origin is at the left-top corner of the window. However this
+// origin can be altered by the Windows coordinate transformation
+// utilities.
//
+// You must make sure the start_x, start_y, size_x, size_y
+// and rotate parameters have exactly same values as you used in
+// the FPDF_RenderPage() function call.
DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page,
int start_x,
int start_y,
@@ -669,33 +644,30 @@ DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page,
double* page_y);
// Function: FPDF_PageToDevice
-// Convert the page coordinate of a point to screen coordinate.
+// Convert the page coordinates of a point to screen coordinates.
// Parameters:
-// page - Handle to the page. Returned by FPDF_LoadPage
-// function.
-// start_x - Left pixel position of the display area in the
-// device coordinate.
-// start_y - Top pixel position of the display area in the device
-// coordinate.
+// page - Handle to the page. Returned by FPDF_LoadPage.
+// start_x - Left pixel position of the display area in
+// device coordinates.
+// start_y - Top pixel position of the display area in device
+// coordinates.
// size_x - Horizontal size (in pixels) for displaying the page.
// size_y - Vertical size (in pixels) for displaying the page.
-// rotate - Page orientation: 0 (normal), 1 (rotated 90 degrees
-// clockwise),
-// 2 (rotated 180 degrees), 3 (rotated 90 degrees
-// counter-clockwise).
-// page_x - X value in page coordinate, for the point to be
-// converted.
-// page_y - Y value in page coordinate, for the point to be
-// converted.
-// device_x - A pointer to an integer receiving the result X value
-// in device coordinate.
-// device_y - A pointer to an integer receiving the result Y value
-// in device coordinate.
+// rotate - Page orientation:
+// 0 (normal)
+// 1 (rotated 90 degrees clockwise)
+// 2 (rotated 180 degrees)
+// 3 (rotated 90 degrees counter-clockwise)
+// page_x - X value in page coordinates.
+// page_y - Y value in page coordinate.
+// device_x - A pointer to an integer receiving the result X
+// value in device coordinates.
+// device_y - A pointer to an integer receiving the result Y
+// value in device coordinates.
// Return value:
// None.
// Comments:
-// See comments of FPDF_DeviceToPage() function.
-//
+// See comments for FPDF_DeviceToPage().
DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page,
int start_x,
int start_y,
@@ -708,79 +680,73 @@ DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page,
int* device_y);
// Function: FPDFBitmap_Create
-// Create a Foxit Device Independent Bitmap (FXDIB).
+// Create a device independent bitmap (FXDIB).
// Parameters:
-// width - Number of pixels in a horizontal line of the bitmap.
-// Must be greater than 0.
-// height - Number of pixels in a vertical line of the bitmap.
-// Must be greater than 0.
-// alpha - A flag indicating whether alpha channel is used.
-// Non-zero for using alpha, zero for not using.
+// width - The number of pixels in width for the bitmap.
+// Must be greater than 0.
+// height - The number of pixels in height for the bitmap.
+// Must be greater than 0.
+// alpha - A flag indicating whether the alpha channel is used.
+// Non-zero for using alpha, zero for not using.
// Return value:
-// The created bitmap handle, or NULL if parameter error or out of
+// The created bitmap handle, or NULL if a parameter error or out of
// memory.
// Comments:
-// An FXDIB always use 4 byte per pixel. The first byte of a pixel is
-// always double word aligned.
-// Each pixel contains red (R), green (G), blue (B) and optionally
-// alpha (A) values.
+// The bitmap always uses 4 bytes per pixel. The first byte is always
+// double word aligned.
+//
// The byte order is BGRx (the last byte unused if no alpha channel) or
// BGRA.
//
-// The pixels in a horizontal line (also called scan line) are stored
-// side by side, with left most
-// pixel stored first (with lower memory address). Each scan line uses
-// width*4 bytes.
+// The pixels in a horizontal line are stored side by side, with the
+// left most pixel stored first (with lower memory address).
+// Each line uses width * 4 bytes.
//
-// Scan lines are stored one after another, with top most scan line
-// stored first. There is no gap
-// between adjacent scan lines.
+// Lines are stored one after another, with the top most line stored
+// first. There is no gap between adjacent lines.
//
// This function allocates enough memory for holding all pixels in the
-// bitmap, but it doesn't
-// initialize the buffer. Applications can use FPDFBitmap_FillRect to
-// fill the bitmap using any color.
+// bitmap, but it doesn't initialize the buffer. Applications can use
+// FPDFBitmap_FillRect to fill the bitmap using any color.
DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width,
int height,
int alpha);
// More DIB formats
-#define FPDFBitmap_Gray 1 // Gray scale bitmap, one byte per pixel.
-#define FPDFBitmap_BGR 2 // 3 bytes per pixel, byte order: blue, green, red.
-#define FPDFBitmap_BGRx \
- 3 // 4 bytes per pixel, byte order: blue, green, red, unused.
-#define FPDFBitmap_BGRA \
- 4 // 4 bytes per pixel, byte order: blue, green, red, alpha.
+// Gray scale bitmap, one byte per pixel.
+#define FPDFBitmap_Gray 1
+// 3 bytes per pixel, byte order: blue, green, red.
+#define FPDFBitmap_BGR 2
+// 4 bytes per pixel, byte order: blue, green, red, unused.
+#define FPDFBitmap_BGRx 3
+// 4 bytes per pixel, byte order: blue, green, red, alpha.
+#define FPDFBitmap_BGRA 4
// Function: FPDFBitmap_CreateEx
-// Create a Foxit Device Independent Bitmap (FXDIB)
+// Create a device independent bitmap (FXDIB)
// Parameters:
-// width - Number of pixels in a horizontal line of the bitmap.
-// Must be greater than 0.
-// height - Number of pixels in a vertical line of the bitmap.
-// Must be greater than 0.
+// width - The number of pixels in width for the bitmap.
+// Must be greater than 0.
+// height - The number of pixels in height for the bitmap.
+// Must be greater than 0.
// format - A number indicating for bitmap format, as defined
-// above.
-// first_scan - A pointer to the first byte of first scan line, for
-// external buffer
-// only. If this parameter is NULL, then the SDK will
-// create its own buffer.
+// above.
+// first_scan - A pointer to the first byte of the first line if
+// using an external buffer. If this parameter is NULL,
+// then the a new buffer will be created.
// stride - Number of bytes for each scan line, for external
-// buffer only..
+// buffer only.
// Return value:
-// The created bitmap handle, or NULL if parameter error or out of
-// memory.
+// The bitmap handle, or NULL if parameter error or out of memory.
// Comments:
-// Similar to FPDFBitmap_Create function, with more formats and
-// external buffer supported.
-// Bitmap created by this function can be used in any place that a
-// FPDF_BITMAP handle is
+// Similar to FPDFBitmap_Create function, but allows for more formats
+// and an external buffer is supported. The bitmap created by this
+// function can be used in any place that a FPDF_BITMAP handle is
// required.
//
-// If external scanline buffer is used, then the application should
-// destroy the buffer
-// by itself. FPDFBitmap_Destroy function will not destroy the buffer.
-//
+// If an external buffer is used, then the application should destroy
+// the buffer by itself. FPDFBitmap_Destroy function will not destroy
+// the buffer.
DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width,
int height,
int format,
@@ -788,29 +754,29 @@ DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width,
int stride);
// Function: FPDFBitmap_FillRect
-// Fill a rectangle area in an FXDIB.
+// Fill a rectangle in a bitmap.
// Parameters:
// bitmap - The handle to the bitmap. Returned by
-// FPDFBitmap_Create function.
-// left - The left side position. Starting from 0 at the
-// left-most pixel.
-// top - The top side position. Starting from 0 at the
-// top-most scan line.
-// width - Number of pixels to be filled in each scan line.
-// height - Number of scan lines to be filled.
+// FPDFBitmap_Create.
+// left - The left position. Starting from 0 at the
+// left-most pixel.
+// top - The top position. Starting from 0 at the
+// top-most line.
+// width - Width in pixels to be filled.
+// height - Height in pixels to be filled.
// color - A 32-bit value specifing the color, in 8888 ARGB
-// format.
+// format.
// Return value:
// None.
// Comments:
-// This function set the color and (optionally) alpha value in
+// This function sets the color and (optionally) alpha value in the
// specified region of the bitmap.
-// NOTE: If alpha channel is used, this function does NOT composite the
-// background with the source color,
-// instead the background will be replaced by the source color and
-// alpha.
-// If alpha channel is not used, the "alpha" parameter is ignored.
//
+// NOTE: If the alpha channel is used, this function does NOT
+// composite the background with the source color, instead the
+// background will be replaced by the source color and the alpha.
+//
+// If the alpha channel is not used, the alpha parameter is ignored.
DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
int left,
int top,
@@ -819,58 +785,57 @@ DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
FPDF_DWORD color);
// Function: FPDFBitmap_GetBuffer
-// Get data buffer of an FXDIB
+// Get data buffer of a bitmap.
// Parameters:
-// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create
-// function.
+// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create.
// Return value:
// The pointer to the first byte of the bitmap buffer.
// Comments:
// The stride may be more than width * number of bytes per pixel
+//
// Applications can use this function to get the bitmap buffer pointer,
-// then manipulate any color
-// and/or alpha values for any pixels in the bitmap.
+// then manipulate any color and/or alpha values for any pixels in the
+// bitmap.
+//
+// The data is in BGRA format. Where the A maybe unused if alpha was
+// not specified.
DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap);
// Function: FPDFBitmap_GetWidth
-// Get width of an FXDIB.
+// Get width of a bitmap.
// Parameters:
-// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create
-// function.
+// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create.
// Return value:
-// The number of pixels in a horizontal line of the bitmap.
+// The width of the bitmap in pixels.
DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap);
// Function: FPDFBitmap_GetHeight
-// Get height of an FXDIB.
+// Get height of a bitmap.
// Parameters:
-// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create
-// function.
+// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create.
// Return value:
-// The number of pixels in a vertical line of the bitmap.
+// The height of the bitmap in pixels.
DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap);
// Function: FPDFBitmap_GetStride
-// Get number of bytes for each scan line in the bitmap buffer.
+// Get number of bytes for each line in the bitmap buffer.
// Parameters:
-// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create
-// function.
+// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create.
// Return value:
-// The number of bytes for each scan line in the bitmap buffer.
+// The number of bytes for each line in the bitmap buffer.
// Comments:
-// The stride may be more than width * number of bytes per pixel
+// The stride may be more than width * number of bytes per pixel.
DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap);
// Function: FPDFBitmap_Destroy
-// Destroy an FXDIB and release all related buffers.
+// Destroy a bitmap and release all related buffers.
// Parameters:
-// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create
-// function.
+// bitmap - Handle to the bitmap. Returned by FPDFBitmap_Create.
// Return value:
// None.
// Comments:
-// This function will not destroy any external buffer.
-//
+// This function will not destroy any external buffers provided when
+// the bitmap was created.
DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap);
// Function: FPDF_VIEWERREF_GetPrintScaling
@@ -879,7 +844,6 @@ DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap);
// document - Handle to the loaded document.
// Return value:
// None.
-//
DLLEXPORT FPDF_BOOL STDCALL
FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document);
@@ -889,7 +853,6 @@ FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document);
// document - Handle to the loaded document.
// Return value:
// The number of copies to be printed.
-//
DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document);
// Function: FPDF_VIEWERREF_GetPrintPageRange
@@ -898,18 +861,16 @@ DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document);
// document - Handle to the loaded document.
// Return value:
// The print page range to be used for printing.
-//
DLLEXPORT FPDF_PAGERANGE STDCALL
FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document);
// Function: FPDF_VIEWERREF_GetDuplex
// Returns the paper handling option to be used when printing from
-// print dialog.
+// the print dialog.
// Parameters:
// document - Handle to the loaded document.
// Return value:
// The paper handling option to be used when printing.
-//
DLLEXPORT FPDF_DUPLEXTYPE STDCALL
FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document);
@@ -922,36 +883,36 @@ FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document);
DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document);
// Function: FPDF_GetNamedDestByName
-// get a special dest handle by the index.
+// Get a the destination handle for the given name.
// Parameters:
// document - Handle to the loaded document.
-// name - The name of a special named dest.
+// name - The name of a destination.
// Return value:
-// The handle of the dest.
-//
+// The handle to the destination.
DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,
FPDF_BYTESTRING name);
// Function: FPDF_GetNamedDest
-// Get the specified named destinations of the PDF document by index.
+// Get the named destination by index.
// Parameters:
// document - Handle to a document
-// index - The index of named destination.
-// buffer - The buffer to obtain destination name, used as
-// wchar_t*.
-// buflen [in/out] - Size of the buffer in bytes on input, length of
-// the result in bytes on output or -1 if the buffer is too small.
-// Return value:
-// The destination handle of a named destination, or NULL if no named
-// destination corresponding to |index|.
+// index - The index of a named destination.
+// buffer - The buffer to store the destination name,
+// used as wchar_t*.
+// buflen [in/out] - Size of the buffer in bytes on input,
+// length of the result in bytes on output
+// or -1 if the buffer is too small.
+// Return value:
+// The destination handle for a given index, or NULL if there is no
+// named destination corresponding to |index|.
// Comments:
// Call this function twice to get the name of the named destination:
-// 1) First time pass in |buffer| as NULL and get buflen.
-// 2) Second time pass in allocated |buffer| and buflen to retrieve
-// |buffer|, which should be used as wchar_t*.
-// If buflen is not sufficiently large, it will be set to -1 upon
-// return.
+// 1) First time pass in |buffer| as NULL and get buflen.
+// 2) Second time pass in allocated |buffer| and buflen to retrieve
+// |buffer|, which should be used as wchar_t*.
//
+// If buflen is not sufficiently large, it will be set to -1 upon
+// return.
DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document,
int index,
void* buffer,