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feat: allow loading PdfWrap from custom dynamic library #6

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feat: allow loading PdfWrap from custom dynamic library #6

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130 changes: 85 additions & 45 deletions lib/src/pdfium_wrap.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import 'package:pdfium_bindings/pdfium_bindings.dart';
class PdfiumWrap {
/// Bindings to PDFium
late PDFiumBindings pdfium;

/// PDFium configuration
late Pointer<FPDF_LIBRARY_CONFIG> config;
final Allocator allocator;
Expand All @@ -19,26 +20,35 @@ class PdfiumWrap {
Pointer<Uint8>? buffer;
Pointer<fpdf_bitmap_t__>? bitmap;

/// Default constructor to use the class
PdfiumWrap({String? libraryPath, this.allocator = calloc}) {
/// Default constructor to use the class, note that if [dylib] field is
/// specified, it will override the library path.
PdfiumWrap({
String? libraryPath,
this.allocator = calloc,
DynamicLibrary? dylib,
}) {
//for windows
var libPath = path.join(Directory.current.path, 'pdfium.dll');
if (dylib == null) {
var libPath = path.join(Directory.current.path, 'pdfium.dll');

if (Platform.isMacOS) {
libPath = path.join(Directory.current.path, 'libpdfium.dylib');
} else if (Platform.isLinux || Platform.isAndroid) {
libPath = path.join(Directory.current.path, 'libpdfium.so');
}
if (libraryPath != null) {
libPath = libraryPath;
}
late DynamicLibrary dylib;
if (Platform.isIOS) {
DynamicLibrary.process();
if (Platform.isMacOS) {
libPath = path.join(Directory.current.path, 'libpdfium.dylib');
} else if (Platform.isLinux || Platform.isAndroid) {
libPath = path.join(Directory.current.path, 'libpdfium.so');
}
if (libraryPath != null) {
libPath = libraryPath;
}
late DynamicLibrary dylib;
if (Platform.isIOS) {
DynamicLibrary.process();
} else {
dylib = DynamicLibrary.open(libPath);
}
pdfium = PDFiumBindings(dylib);
} else {
dylib = DynamicLibrary.open(libPath);
pdfium = PDFiumBindings(dylib);
}
pdfium = PDFiumBindings(dylib);

config = allocator<FPDF_LIBRARY_CONFIG>();
config.ref.version = 2;
Expand All @@ -56,7 +66,9 @@ class PdfiumWrap {
PdfiumWrap loadDocumentFromPath(String path, {String? password}) {
final filePathP = stringToNativeInt8(path);
_document = pdfium.FPDF_LoadDocument(
filePathP, password != null ? stringToNativeInt8(password) : nullptr,);
filePathP,
password != null ? stringToNativeInt8(password) : nullptr,
);
if (_document == nullptr) {
final err = pdfium.FPDF_GetLastError();
throw PdfiumException.fromErrorCode(err);
Expand All @@ -77,9 +89,10 @@ class PdfiumWrap {
pointerList.setAll(0, bytes);

_document = pdfium.FPDF_LoadMemDocument64(
frameData.cast<Void>(),
bytes.length,
password != null ? stringToNativeInt8(password) : nullptr,);
frameData.cast<Void>(),
bytes.length,
password != null ? stringToNativeInt8(password) : nullptr,
);

if (_document == nullptr) {
final err = pdfium.FPDF_GetLastError();
Expand Down Expand Up @@ -140,8 +153,13 @@ class PdfiumWrap {
/// double word aligned.
/// The byte order is BGRx (the last byte unused if no alpha channel) or
/// BGRA. flags FPDF_ANNOT | FPDF_LCD_TEXT
Uint8List renderPageAsBytes(int width, int height,
{int backgroundColor = 268435455, int rotate = 0, int flags = 0,}) {
Uint8List renderPageAsBytes(
int width,
int height, {
int backgroundColor = 268435455,
int rotate = 0,
int flags = 0,
}) {
if (_page == nullptr) {
throw PdfiumException(message: 'Page not load');
}
Expand All @@ -162,7 +180,15 @@ class PdfiumWrap {
bitmap = pdfium.FPDFBitmap_Create(w, h, 0);
pdfium.FPDFBitmap_FillRect(bitmap!, 0, 0, w, h, backgroundColor);
pdfium.FPDF_RenderPageBitmap(
bitmap!, _page!, startX, startY, sizeX, sizeY, rotate, flags,);
bitmap!,
_page!,
startX,
startY,
sizeX,
sizeY,
rotate,
flags,
);
// The pointer to the first byte of the bitmap buffer The data is in BGRA format
buffer = pdfium.FPDFBitmap_GetBuffer(bitmap!);
//stride = width * 4 bytes per pixel BGRA
Expand All @@ -177,24 +203,31 @@ class PdfiumWrap {
///
/// Throws an [PdfiumException] if no page is loaded.
/// Returns a instance of [PdfiumWrap]
PdfiumWrap savePageAsPng(String outPath,
{int? width,
int? height,
int backgroundColor = 268435455,
double scale = 1,
int rotate = 0,
int flags = 0,
bool flush = false,
int pngLevel = 6,}) {
PdfiumWrap savePageAsPng(
String outPath, {
int? width,
int? height,
int backgroundColor = 268435455,
double scale = 1,
int rotate = 0,
int flags = 0,
bool flush = false,
int pngLevel = 6,
}) {
if (_page == nullptr) {
throw PdfiumException(message: 'Page not load');
}
// var backgroundStr = "FFFFFFFF"; // as int 268435455
final w = ((width ?? getPageWidth()) * scale).round();
final h = ((height ?? getPageHeight()) * scale).round();

final bytes = renderPageAsBytes(w, h,
backgroundColor: backgroundColor, rotate: rotate, flags: flags,);
final bytes = renderPageAsBytes(
w,
h,
backgroundColor: backgroundColor,
rotate: rotate,
flags: flags,
);

final Image image = Image.fromBytes(
width: w,
Expand All @@ -214,24 +247,31 @@ class PdfiumWrap {
///
/// Throws an [PdfiumException] if no page is loaded.
/// Returns a instance of [PdfiumWrap]
PdfiumWrap savePageAsJpg(String outPath,
{int? width,
int? height,
int backgroundColor = 268435455,
double scale = 1,
int rotate = 0,
int flags = 0,
bool flush = false,
int qualityJpg = 100,}) {
PdfiumWrap savePageAsJpg(
String outPath, {
int? width,
int? height,
int backgroundColor = 268435455,
double scale = 1,
int rotate = 0,
int flags = 0,
bool flush = false,
int qualityJpg = 100,
}) {
if (_page == nullptr) {
throw PdfiumException(message: 'Page not load');
}
// var backgroundStr = "FFFFFFFF"; // as int 268435455
final w = ((width ?? getPageWidth()) * scale).round();
final h = ((height ?? getPageHeight()) * scale).round();

final bytes = renderPageAsBytes(w, h,
backgroundColor: backgroundColor, rotate: rotate, flags: flags,);
final bytes = renderPageAsBytes(
w,
h,
backgroundColor: backgroundColor,
rotate: rotate,
flags: flags,
);

final Image image = Image.fromBytes(
width: w,
Expand Down