RetroZilla/layout/svg/renderer/public/nsISVGGlyphGeometrySource.idl

/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 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
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 * 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)
 *
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#include "nsISVGGlyphMetricsSource.idl"

interface nsISVGRendererGlyphMetrics;

/**
 * \addtogroup rendering_backend_interfaces Rendering Backend Interfaces
 * @{
 */

/**
 * Abstracts a description of a 'composite glyph' (character string
 * with associated font and styling information) in the SVG rendering
 * backend for use by a rendering engine's nsISVGRendererGlyphGeometry
 * objects. In addition to the attributes of the
 * nsISVGGlyphMetricsSource interface, this interface contains
 * absolute positioning and other information, such as e.g. individual
 * character highlighting, which doesn't affect the actual metrics of
 * the glyph. The metrics of the glyph, as given by the rendering
 * engine-native object implementing nsISVGRendererGlyphMetrics are
 * also provided as an attribute.
 *
 * An engine-native glyph geometry object will be informed of changes
 * in its associated composite glyph with a call to its
 * nsISVGRendererGlyphMetrics::update() method with an OR-ed
 * combination of the UPDATEMASK_* constants defined in this interface
 * (and its base-interface).
 *
 * @nosubgrouping
 */
[uuid(b36065f1-c52b-4eda-b9ad-e483cf1a63bf)]
interface nsISVGGlyphGeometrySource : nsISVGGlyphMetricsSource
{
  /**
   * @name Glyph metrics
   * @{
   */
  readonly attribute nsISVGRendererGlyphMetrics metrics;
  const unsigned long UPDATEMASK_METRICS       = 0x00040000;
  /** @} */

  /**
   * @name Glyph start position
   * @{
   */
  readonly attribute float x; // start position of glyph *before* applying CanvasTM
  const unsigned long UPDATEMASK_X             = 0x00080000;
  readonly attribute float y;
  const unsigned long UPDATEMASK_Y             = 0x00100000;
  /** @} */

  /**
   * @name Partial highlighting for selection feedback
   * @{
   */
  readonly attribute boolean hasHighlight;
  const unsigned long UPDATEMASK_HAS_HIGHLIGHT = 0x00200000;
  [noscript] void getHighlight(out unsigned long charnum, out unsigned long nchars,
                               out nscolor foreground, out nscolor background);
  const unsigned long UPDATEMASK_HIGHLIGHT     = 0x00400000;
  /** @} */
};

/** @} */