michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef GFX_FONTMISSINGGLYPHS_H
michael@0: #define GFX_FONTMISSINGGLYPHS_H
michael@0: 
michael@0: #include "gfxTypes.h"
michael@0: #include "gfxRect.h"
michael@0: 
michael@0: class gfxContext;
michael@0: 
michael@0: /**
michael@0:  * This class should not be instantiated. It's just a container
michael@0:  * for some helper functions.
michael@0:  */
michael@0: class gfxFontMissingGlyphs {
michael@0: public:
michael@0:     /**
michael@0:      * Draw hexboxes for a missing glyph.
michael@0:      * @param aContext the context to draw to
michael@0:      * @param aRect the glyph-box for the glyph that is missing
michael@0:      * @param aChar the UTF16 codepoint for the character
michael@0:      * @param aAppUnitsPerDevPixel the appUnits to devPixel ratio we're using,
michael@0:      *                             (so we can scale glyphs to a sensible size)
michael@0:      */
michael@0:     static void DrawMissingGlyph(gfxContext    *aContext,
michael@0:                                  const gfxRect& aRect,
michael@0:                                  uint32_t       aChar,
michael@0:                                  uint32_t       aAppUnitsPerDevPixel);
michael@0:     /**
michael@0:      * @return the desired minimum width for a glyph-box that will allow
michael@0:      * the hexboxes to be drawn reasonably.
michael@0:      */
michael@0:     static gfxFloat GetDesiredMinWidth(uint32_t aChar,
michael@0:                                        uint32_t aAppUnitsPerDevUnit);
michael@0: };
michael@0: 
michael@0: #endif