/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkDocument_DEFINED
#define SkDocument_DEFINED
#include "SkBitmap.h"
#include "SkPicture.h"
#include "SkRect.h"
#include "SkRefCnt.h"
#include "SkString.h"
#include "SkTime.h"
class SkCanvas;
class SkWStream;
#ifdef SK_BUILD_FOR_WIN
struct IXpsOMObjectFactory;
#endif
/** SK_ScalarDefaultDPI is 72 DPI.
*/
#define SK_ScalarDefaultRasterDPI 72.0f
/**
* High-level API for creating a document-based canvas. To use..
*
* 1. Create a document, specifying a stream to store the output.
* 2. For each "page" of content:
* a. canvas = doc->beginPage(...)
* b. draw_my_content(canvas);
* c. doc->endPage();
* 3. Close the document with doc->close().
*/
class SK_API SkDocument : public SkRefCnt {
public:
struct OptionalTimestamp {
SkTime::DateTime fDateTime;
bool fEnabled;
OptionalTimestamp() : fEnabled(false) {}
};
/**
* Optional metadata to be passed into the PDF factory function.
*/
struct PDFMetadata {
/**
* The document's title.
*/
SkString fTitle;
/**
* The name of the person who created the document.
*/
SkString fAuthor;
/**
* The subject of the document.
*/
SkString fSubject;
/**
* Keywords associated with the document. Commas may be used
* to delineate keywords within the string.
*/
SkString fKeywords;
/**
* If the document was converted to PDF from another format,
* the name of the conforming product that created the
* original document from which it was converted.
*/
SkString fCreator;
/**
* The product that is converting this document to PDF.
*
* Leave fProducer empty to get the default, correct value.
*/
SkString fProducer;
/**
* The date and time the document was created.
*/
OptionalTimestamp fCreation;
/**
* The date and time the document was most recently modified.
*/
OptionalTimestamp fModified;
/** The DPI (pixels-per-inch) at which features without
* native PDF support will be rasterized (e.g. draw image
* with perspective, draw text with perspective, ...) A
* larger DPI would create a PDF that reflects the
* original intent with better fidelity, but it can make
* for larger PDF files too, which would use more memory
* while rendering, and it would be slower to be processed
* or sent online or to printer.
*/
SkScalar fRasterDPI = SK_ScalarDefaultRasterDPI;
/** If true, include XMP metadata, a document UUID, and sRGB output intent information.
* This adds length to the document and makes it non-reproducable, but are necessary
* features for PDF/A-2b conformance
*/
bool fPDFA = false;
/**
* Encoding quality controls the trade-off between size and quality. By default this is
* set to 101 percent, which corresponds to lossless encoding. If this value is set to
* a value <= 100, and the image is opaque, it will be encoded (using JPEG) with that
* quality setting.
*/
int fEncodingQuality = 101;
};
/**
* Create a PDF-backed document, writing the results into a
* SkWStream.
*
* PDF pages are sized in point units. 1 pt == 1/72 inch == 127/360 mm.
*
* @param stream A PDF document will be written to this stream. The document may write
* to the stream at anytime during its lifetime, until either close() is
* called or the document is deleted.
* @param metadata a PDFmetadata object. Any fields may be left empty.
*
* @returns NULL if there is an error, otherwise a newly created PDF-backed SkDocument.
*/
static sk_sp<SkDocument> MakePDF(SkWStream* stream, const PDFMetadata& metadata);
static sk_sp<SkDocument> MakePDF(SkWStream* stream);
#ifdef SK_BUILD_FOR_WIN
/**
* Create a XPS-backed document, writing the results into the stream.
*
* @param stream A XPS document will be written to this stream. The
* document may write to the stream at anytime during its
* lifetime, until either close() or abort() are called or
* the document is deleted.
* @param xpsFactory A pointer to a COM XPS factory. Must be non-null.
* The document will take a ref to the factory. See
* dm/DMSrcSink.cpp for an example.
* @param dpi The DPI (pixels-per-inch) at which features without
* native XPS support will be rasterized (e.g. draw image
* with perspective, draw text with perspective, ...) A
* larger DPI would create a XPS that reflects the
* original intent with better fidelity, but it can make
* for larger XPS files too, which would use more memory
* while rendering, and it would be slower to be processed
* or sent online or to printer.
*
* @returns nullptr if XPS is not supported.
*/
static sk_sp<SkDocument> MakeXPS(SkWStream* stream,
IXpsOMObjectFactory* xpsFactory,
SkScalar dpi = SK_ScalarDefaultRasterDPI);
#endif
/**
* Begin a new page for the document, returning the canvas that will draw
* into the page. The document owns this canvas, and it will go out of
* scope when endPage() or close() is called, or the document is deleted.
*/
SkCanvas* beginPage(SkScalar width, SkScalar height, const SkRect* content = nullptr);
/**
* Call endPage() when the content for the current page has been drawn
* (into the canvas returned by beginPage()). After this call the canvas
* returned by beginPage() will be out-of-scope.
*/
void endPage();
/**
* Call close() when all pages have been drawn. This will close the file
* or stream holding the document's contents. After close() the document
* can no longer add new pages. Deleting the document will automatically
* call close() if need be.
*/
void close();
/**
* Call abort() to stop producing the document immediately.
* The stream output must be ignored, and should not be trusted.
*/
void abort();
protected:
SkDocument(SkWStream*);
// note: subclasses must call close() in their destructor, as the base class
// cannot do this for them.
virtual ~SkDocument();
virtual SkCanvas* onBeginPage(SkScalar width, SkScalar height) = 0;
virtual void onEndPage() = 0;
virtual void onClose(SkWStream*) = 0;
virtual void onAbort() = 0;
// Allows subclasses to write to the stream as pages are written.
SkWStream* getStream() { return fStream; }
enum State {
kBetweenPages_State,
kInPage_State,
kClosed_State
};
State getState() const { return fState; }
private:
SkWStream* fStream;
State fState;
typedef SkRefCnt INHERITED;
};
#endif