зеркало из https://github.com/mozilla/gecko-dev.git
301 строка
9.6 KiB
C++
301 строка
9.6 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 "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(const uint8_t *aBuffer, uint32_t aBufLen,
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hb_blob_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(const uint8_t *aBuffer, uint32_t aBufLen);
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nsresult SetupPresentation();
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void FindGlyphElements(Element *aElement, hb_blob_t *aCmapTable);
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void InsertGlyphId(Element *aGlyphElement);
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void InsertGlyphChar(Element *aGlyphElement, hb_blob_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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* The gfxSVGGlyphs object takes over ownership of the blob references
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* that are passed in, and will hb_blob_destroy() them when finished;
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* the caller should -not- destroy these references.
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*/
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gfxSVGGlyphs(hb_blob_t *aSVGTable, hb_blob_t *aCmapTable);
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/**
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* Releases our references to the SVG and cmap tables.
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*/
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~gfxSVGGlyphs();
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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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hb_blob_t *mSVGData;
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hb_blob_t *mCmapData;
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const struct Header {
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mozilla::AutoSwap_PRUint16 mVersion;
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mozilla::AutoSwap_PRUint16 mIndexLength;
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} *mHeader;
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const struct IndexEntry {
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mozilla::AutoSwap_PRUint16 mStartGlyph;
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mozilla::AutoSwap_PRUint16 mEndGlyph;
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mozilla::AutoSwap_PRUint32 mDocOffset;
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mozilla::AutoSwap_PRUint32 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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