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225 lines
7.2 KiB
C++
225 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** 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 Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <stuart@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_FONT_H
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#define GFX_FONT_H
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#include "prtypes.h"
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#include "gfxTypes.h"
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#include "nsString.h"
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#include "gfxPoint.h"
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#include "nsTArray.h"
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class gfxContext;
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class gfxTextRun;
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#define FONT_STYLE_NORMAL 0
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#define FONT_STYLE_ITALIC 1
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#define FONT_STYLE_OBLIQUE 2
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#define FONT_VARIANT_NORMAL 0
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#define FONT_VARIANT_SMALL_CAPS 1
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#define FONT_DECORATION_NONE 0x0
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#define FONT_DECORATION_UNDERLINE 0x1
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#define FONT_DECORATION_OVERLINE 0x2
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#define FONT_DECORATION_STRIKEOUT 0x4
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#define FONT_WEIGHT_NORMAL 400
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#define FONT_WEIGHT_BOLD 700
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class gfxFontGroup;
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struct THEBES_API gfxFontStyle {
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gfxFontStyle(PRUint8 aStyle, PRUint8 aVariant,
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PRUint16 aWeight, PRUint8 aDecoration, gfxFloat aSize,
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const nsACString& aLangGroup,
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float aSizeAdjust, PRPackedBool aSystemFont,
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PRPackedBool aFamilyNameQuirks);
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// The style of font (normal, italic, oblique)
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PRUint8 style : 7;
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// Say that this font is a system font and therefore does not
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// require certain fixup that we do for fonts from untrusted
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// sources.
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PRPackedBool systemFont : 1;
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// The variant of the font (normal, small-caps)
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PRUint8 variant : 7;
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// True if the character set quirks (for treatment of "Symbol",
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// "Wingdings", etc.) should be applied.
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PRPackedBool familyNameQuirks : 1;
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// The weight of the font. 100, 200, ... 900 are the weights, and
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// single integer offsets request the next bolder/lighter font
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// available. For example, for a font available in weights 200,
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// 400, 700, and 900, a weight of 898 should lead to the weight 400
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// font being used, since it is two weights lighter than 900.
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PRUint16 weight;
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// The decorations on the font (underline, overline,
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// line-through). The decorations can be binary or'd together.
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PRUint8 decorations;
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// The logical size of the font, in pixels
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gfxFloat size;
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// the language group
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nsCString langGroup;
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// The aspect-value (ie., the ratio actualsize:actualxheight) that any
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// actual physical font created from this font structure must have when
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// rendering or measuring a string. A value of 0 means no adjustment
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// needs to be done.
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float sizeAdjust;
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void ComputeWeightAndOffset(PRInt16 *outBaseWeight,
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PRInt16 *outOffset) const;
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};
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/* a SPECIFIC single font family */
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class THEBES_API gfxFont {
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THEBES_DECL_REFCOUNTING_ABSTRACT
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public:
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gfxFont(const nsAString &aName, const gfxFontStyle *aFontGroup);
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virtual ~gfxFont() {}
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const nsString& GetName() const { return mName; }
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const gfxFontStyle *GetStyle() const { return mStyle; }
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struct Metrics {
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gfxFloat xHeight;
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gfxFloat superscriptOffset;
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gfxFloat subscriptOffset;
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gfxFloat strikeoutSize;
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gfxFloat strikeoutOffset;
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gfxFloat underlineSize;
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gfxFloat underlineOffset;
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gfxFloat height;
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gfxFloat internalLeading;
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gfxFloat externalLeading;
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gfxFloat emHeight;
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gfxFloat emAscent;
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gfxFloat emDescent;
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gfxFloat maxHeight;
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gfxFloat maxAscent;
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gfxFloat maxDescent;
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gfxFloat maxAdvance;
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gfxFloat aveCharWidth;
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gfxFloat spaceWidth;
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};
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virtual const gfxFont::Metrics& GetMetrics() = 0;
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protected:
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// The family name of the font
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nsString mName;
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const gfxFontStyle *mStyle;
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};
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class THEBES_API gfxFontGroup {
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public:
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gfxFontGroup(const nsAString& aFamilies, const gfxFontStyle *aStyle);
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virtual ~gfxFontGroup() {
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mFonts.Clear();
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}
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gfxFont *GetFontAt(PRInt32 i) {
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return NS_STATIC_CAST(gfxFont*, mFonts[i]);
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}
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PRUint32 FontListLength() const {
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return mFonts.Length();
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}
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const gfxFontStyle *GetStyle() const { return &mStyle; }
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/* unicode method */
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virtual gfxTextRun *MakeTextRun(const nsAString& aString) = 0;
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/* ASCII text only, not UTF-8 */
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virtual gfxTextRun *MakeTextRun(const nsACString& aString) = 0;
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/* helper function for splitting font families on commas and
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* calling a function for each family to fill the mFonts array
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*/
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typedef PRBool (*FontCreationCallback) (const nsAString& aName, const nsACString& aGenericName, void *closure);
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static PRBool ForEachFont(const nsAString& aFamilies,
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const nsACString& aLangGroup,
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FontCreationCallback fc,
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void *closure);
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PRBool ForEachFont(FontCreationCallback fc, void *closure);
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/* this will call back fc with the a generic font based on the style's langgroup */
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void FindGenericFontFromStyle(FontCreationCallback fc, void *closure);
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protected:
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nsString mFamilies;
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gfxFontStyle mStyle;
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nsTArray< nsRefPtr<gfxFont> > mFonts;
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};
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// these do not copy the text
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class THEBES_API gfxTextRun {
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THEBES_DECL_REFCOUNTING_ABSTRACT
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public:
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virtual void Draw(gfxContext *aContext, gfxPoint pt) = 0;
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// returns length in pixels
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virtual gfxFloat Measure(gfxContext *aContext) = 0;
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virtual void SetSpacing(const nsTArray<gfxFloat> &spacing) = 0;
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virtual const nsTArray<gfxFloat> *const GetSpacing() const = 0;
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// defaults to FALSE
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virtual void SetRightToLeft(PRBool aIsRTL) { mIsRTL = aIsRTL; }
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virtual PRBool IsRightToLeft() const { return mIsRTL; }
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private:
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PRBool mIsRTL;
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};
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#endif
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