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- /* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is the Mozilla SVG project.
- *
- * The Initial Developer of the Original Code is
- * Crocodile Clips Ltd.
- * Portions created by the Initial Developer are Copyright (C) 2002
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Alex Fritze <alex@croczilla.com> (original author)
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsISupports.idl"
-
- interface nsIDOMSVGRect;
-
- /**
- * \addtogroup renderer_interfaces Rendering Engine Interfaces
- * @{
- */
-
- /**
- * One of a number of interfaces (all starting with nsISVGRenderer*)
- * to be implemented by an SVG rendering engine. See nsISVGRenderer
- * for more details.
- *
- * The SVG rendering backend uses this interface to communicate to the
- * rendering engine-native glyph metrics objects.
- *
- * A glyph metrics object is instantiated by the backend for a given
- * nsISVGGlyphMetricsSource object with a call to
- * nsISVGRenderer::createGlyphMetrics(). The glyph metrics object is
- * assumed to store a reference to its associated source object and
- * provide metrics information about the (composite) glyph described
- * by nsISVGGlyphMetricsSource::characterData,
- * nsISVGGlyphMetricsSource::font, nsISVGGlyphMetricsSource::canvasTM, and
- * other relevant style such as nsISVGGlyphMetricsSource::strokeWidth.
- */
- [scriptable, uuid(8665f6e9-6ed6-4ff8-b511-46c8068b3960)]
- interface nsISVGRendererGlyphMetrics : nsISupports
- {
- /**
- * Untransformed width of the composite glyph in pixels.
- */
- readonly attribute float advance;
-
- /**
- * Untransformed bounding box of the composite glyph in pixel
- * coordinates.
- */
- readonly attribute nsIDOMSVGRect boundingBox;
-
- /**
- * Get the untransformed bounding box of an individual glyph.
- *
- * @param charnum The index of the character in
- * nsISVGGlyphMetricsSource::characterData whose glyph bounding box
- * is to be determined
- * @return The untransformed bounding box in pixel coordinates
- */
- nsIDOMSVGRect getExtentOfChar(in unsigned long charnum);
-
- /**
- * @name Baseline offset constants for getBaselineOffset()
- * @{
- */
- const unsigned short BASELINE_ALPHABETIC = 0;
- const unsigned short BASELINE_HANGING = 1;
- const unsigned short BASELINE_IDEOGRAPHC = 2;
- const unsigned short BASELINE_MATHEMATICAL = 3;
- const unsigned short BASELINE_CENTRAL = 4;
- const unsigned short BASELINE_MIDDLE = 5;
- const unsigned short BASELINE_TEXT_BEFORE_EDGE = 6;
- const unsigned short BASELINE_TEXT_AFTER_EDGE = 7;
- /** @} */
-
- /**
- * Retrieve the (y-axis) offset of the given baseline.
- *
- * @param baselineIdentifier One of the BASELINE_* constants defined
- * in this interface.
- * @return Y-axis offset in pixels relative to top of bounding box.
- */
- float getBaselineOffset(in unsigned short baselineIdentifier);
-
- /**
- * Called by this object's corresponding nsISVGGlyphMetricsSource as
- * a notification that some of the source's data (identified by
- * paramter 'updatemask') has changed.
- *
- * @param updatemask An OR-ed combination of the UPDATEMASK_*
- * constants defined in nsISVGGlyphMetricsSource.
- * @return PR_TRUE if the metrics have changed as a result of the
- * source update, PR_FALSE otherwise.
- */
- boolean update(in unsigned long updatemask);
-
- };
-
- /** @} */
-