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f745e28a4c
gfxTextObjectPaint::GetFillPattern/GetStrokePattern should take the destination's CTM as a parameter in order to set up the pattern matrix correctly, since the pattern matrix is combined with the CTM by cairo/Thebes --- but we want the pattern rendering to be independendt of the CTM, instead depending only on the TM set up when we initialized the gfxTextObjectPaint. We make SVGTextObjectPaint store matrices that map device space to pattern space.
301 lines
9.5 KiB
C++
301 lines
9.5 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Edwin Flores <eflores@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_SVG_GLYPHS_WRAPPER_H
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#define GFX_SVG_GLYPHS_WRAPPER_H
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#include "gfxFontUtils.h"
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#include "nsString.h"
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#include "nsIDocument.h"
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#include "nsAutoPtr.h"
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#include "nsIContentViewer.h"
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#include "nsIPresShell.h"
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#include "nsClassHashtable.h"
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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#include "nsIDocument.h"
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#include "gfxPattern.h"
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#include "gfxFont.h"
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#include "mozilla/gfx/UserData.h"
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/**
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* Wraps an SVG document contained in the SVG table of an OpenType font.
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* There may be multiple SVG documents in an SVG table which we lazily parse
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* so we have an instance of this class for every document in the SVG table
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* which contains a glyph ID which has been used
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* Finds and looks up elements contained in the SVG document which have glyph
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* mappings to be drawn by gfxSVGGlyphs
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*/
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class gfxSVGGlyphsDocument
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{
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typedef mozilla::dom::Element Element;
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typedef gfxFont::DrawMode DrawMode;
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public:
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gfxSVGGlyphsDocument(uint8_t *aBuffer, uint32_t aBufLen,
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const FallibleTArray<uint8_t>& aCmapTable);
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Element *GetGlyphElement(uint32_t aGlyphId);
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~gfxSVGGlyphsDocument() {
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if (mViewer) {
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mViewer->Destroy();
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}
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}
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private:
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nsresult ParseDocument(uint8_t *aBuffer, uint32_t aBufLen);
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nsresult SetupPresentation();
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void FindGlyphElements(Element *aElement,
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const FallibleTArray<uint8_t> &aCmapTable);
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void InsertGlyphId(Element *aGlyphElement);
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void InsertGlyphChar(Element *aGlyphElement,
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const FallibleTArray<uint8_t> &aCmapTable);
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nsCOMPtr<nsIDocument> mDocument;
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nsCOMPtr<nsIContentViewer> mViewer;
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nsCOMPtr<nsIPresShell> mPresShell;
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nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
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};
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/**
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* Used by |gfxFontEntry| to represent the SVG table of an OpenType font.
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* Handles lazy parsing of the SVG documents in the table, looking up SVG glyphs
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* and rendering SVG glyphs.
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* Each |gfxFontEntry| owns at most one |gfxSVGGlyphs| instance.
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*/
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class gfxSVGGlyphs
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{
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private:
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typedef mozilla::dom::Element Element;
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typedef gfxFont::DrawMode DrawMode;
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public:
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static const float SVG_UNITS_PER_EM;
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/**
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* @param aSVGTable The SVG table from the OpenType font
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* @param aCmapTable The CMAP table from the OpenType font
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*/
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gfxSVGGlyphs(FallibleTArray<uint8_t>& aSVGTable,
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const FallibleTArray<uint8_t>& aCmapTable);
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/**
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* Big- to little-endian conversion for headers
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*/
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void UnmangleHeaders();
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/**
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* Find the |gfxSVGGlyphsDocument| containing an SVG glyph for |aGlyphId|.
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* If |aGlyphId| does not map to an SVG document, return null.
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* If a |gfxSVGGlyphsDocument| has not been created for the document, create one.
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*/
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gfxSVGGlyphsDocument *FindOrCreateGlyphsDocument(uint32_t aGlyphId);
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/**
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* Return true iff there is an SVG glyph for |aGlyphId|
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*/
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bool HasSVGGlyph(uint32_t aGlyphId);
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/**
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* Render the SVG glyph for |aGlyphId|
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* @param aDrawMode Whether to fill or stroke or both; see gfxFont::DrawMode
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* @param aObjectPaint Information on outer text object paints.
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* See |gfxTextObjectPaint|.
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*/
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bool RenderGlyph(gfxContext *aContext, uint32_t aGlyphId, DrawMode aDrawMode,
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gfxTextObjectPaint *aObjectPaint);
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/**
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* Get the extents for the SVG glyph associated with |aGlyphId|
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* @param aSVGToAppSpace The matrix mapping the SVG glyph space to the
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* target context space
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*/
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bool GetGlyphExtents(uint32_t aGlyphId, const gfxMatrix& aSVGToAppSpace,
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gfxRect *aResult);
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private:
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Element *GetGlyphElement(uint32_t aGlyphId);
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nsClassHashtable<nsUint32HashKey, gfxSVGGlyphsDocument> mGlyphDocs;
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nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
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FallibleTArray<uint8_t> mSVGData;
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FallibleTArray<uint8_t> mCmapData;
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struct Header {
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uint16_t mVersion;
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uint16_t mIndexLength;
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} *mHeader;
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struct IndexEntry {
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uint16_t mStartGlyph;
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uint16_t mEndGlyph;
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uint32_t mDocOffset;
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uint32_t mDocLength;
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} *mIndex;
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static int CompareIndexEntries(const void *_a, const void *_b);
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};
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/**
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* Used for trickling down paint information through to SVG glyphs.
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* Will be extended in later patch.
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*/
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class gfxTextObjectPaint
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{
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protected:
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gfxTextObjectPaint() { }
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public:
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static mozilla::gfx::UserDataKey sUserDataKey;
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/*
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* Get outer text object pattern with the specified opacity value.
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* This lets us inherit paints and paint opacities (i.e. fill/stroke and
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* fill-opacity/stroke-opacity) separately.
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*/
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virtual already_AddRefed<gfxPattern> GetFillPattern(float aOpacity,
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const gfxMatrix& aCTM) = 0;
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virtual already_AddRefed<gfxPattern> GetStrokePattern(float aOpacity,
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const gfxMatrix& aCTM) = 0;
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virtual float GetFillOpacity() { return 1.0f; }
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virtual float GetStrokeOpacity() { return 1.0f; }
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void InitStrokeGeometry(gfxContext *aContext,
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float devUnitsPerSVGUnit);
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FallibleTArray<gfxFloat>& GetStrokeDashArray() {
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return mDashes;
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}
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gfxFloat GetStrokeDashOffset() {
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return mDashOffset;
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}
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gfxFloat GetStrokeWidth() {
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return mStrokeWidth;
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}
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already_AddRefed<gfxPattern> GetFillPattern(const gfxMatrix& aCTM) {
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return GetFillPattern(GetFillOpacity(), aCTM);
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}
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already_AddRefed<gfxPattern> GetStrokePattern(const gfxMatrix& aCTM) {
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return GetStrokePattern(GetStrokeOpacity(), aCTM);
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}
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virtual ~gfxTextObjectPaint() { }
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private:
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FallibleTArray<gfxFloat> mDashes;
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gfxFloat mDashOffset;
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gfxFloat mStrokeWidth;
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};
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/**
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* For passing in patterns where the outer text object has no separate pattern
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* opacity value.
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*/
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class SimpleTextObjectPaint : public gfxTextObjectPaint
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{
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private:
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static const gfxRGBA sZero;
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public:
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static gfxMatrix SetupDeviceToPatternMatrix(gfxPattern *aPattern,
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const gfxMatrix& aCTM)
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{
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if (!aPattern) {
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return gfxMatrix();
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}
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gfxMatrix deviceToUser = aCTM;
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deviceToUser.Invert();
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return deviceToUser * aPattern->GetMatrix();
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}
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SimpleTextObjectPaint(gfxPattern *aFillPattern, gfxPattern *aStrokePattern,
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const gfxMatrix& aCTM) :
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mFillPattern(aFillPattern ? aFillPattern : new gfxPattern(sZero)),
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mStrokePattern(aStrokePattern ? aStrokePattern : new gfxPattern(sZero))
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{
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mFillMatrix = SetupDeviceToPatternMatrix(aFillPattern, aCTM);
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mStrokeMatrix = SetupDeviceToPatternMatrix(aStrokePattern, aCTM);
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}
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already_AddRefed<gfxPattern> GetFillPattern(float aOpacity,
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const gfxMatrix& aCTM) {
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if (mFillPattern) {
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mFillPattern->SetMatrix(aCTM * mFillMatrix);
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}
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nsRefPtr<gfxPattern> fillPattern = mFillPattern;
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return fillPattern.forget();
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}
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already_AddRefed<gfxPattern> GetStrokePattern(float aOpacity,
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const gfxMatrix& aCTM) {
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if (mStrokePattern) {
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mStrokePattern->SetMatrix(aCTM * mStrokeMatrix);
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}
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nsRefPtr<gfxPattern> strokePattern = mStrokePattern;
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return strokePattern.forget();
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}
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float GetFillOpacity() {
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return mFillPattern ? 1.0f : 0.0f;
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}
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float GetStrokeOpacity() {
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return mStrokePattern ? 1.0f : 0.0f;
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}
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private:
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nsRefPtr<gfxPattern> mFillPattern;
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nsRefPtr<gfxPattern> mStrokePattern;
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// Device space to pattern space transforms
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gfxMatrix mFillMatrix;
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gfxMatrix mStrokeMatrix;
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};
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#endif
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