зеркало из https://github.com/mozilla/pjs.git
580 строки
22 KiB
C++
580 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 nsStyleAnimation.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Holbert <dholbert@mozilla.com>, Mozilla Corporation
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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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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/* Utilities for animation of computed style values */
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#include "nsStyleAnimation.h"
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#include "nsCOMArray.h"
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#include "nsIStyleRule.h"
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#include "nsICSSStyleRule.h"
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#include "nsString.h"
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#include "nsStyleCoord.h"
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#include "nsStyleContext.h"
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#include "nsStyleSet.h"
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#include "nsComputedDOMStyle.h"
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#include "nsICSSParser.h"
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#include "nsICSSLoader.h"
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#include "nsCSSDataBlock.h"
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#include "nsCSSDeclaration.h"
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#include "prlog.h"
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#include <math.h>
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// HELPER METHODS
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// --------------
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/*
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* Given two units, this method returns a common unit that they can both be
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* converted into, if possible. This is intended to facilitate
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* interpolation, distance-computation, and addition between "similar" units.
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*
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* The ordering of the arguments should not affect the output of this method.
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*
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* If there's no sensible common unit, this method returns eStyleUnit_Null.
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*
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* @param aFirstUnit One unit to resolve.
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* @param aFirstUnit The other unit to resolve.
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* @return A "common" unit that both source units can be converted into, or
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* eStyleUnit_Null if that's not possible.
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*/
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static
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nsStyleUnit
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GetCommonUnit(nsStyleUnit aFirstUnit,
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nsStyleUnit aSecondUnit)
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{
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// XXXdholbert Naive implementation for now: simply require that the input
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// units match.
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if (aFirstUnit != aSecondUnit) {
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// XXXdholbert Fail on mismatches for now.
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// Eventually we'll need to be able to resolve conflicts here, e.g. for
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// rgb() colors vs. named colors. Some conflicts can't be resolved,
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// e.g. percent vs coord, which we'll hopefully handle using CSS calc()
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// once that's implemented.
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NS_WARNING("start unit & end unit don't match -- need to resolve this "
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"and pick which one we want to use");
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return eStyleUnit_Null;
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}
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return aFirstUnit;
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}
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// CLASS METHODS
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// -------------
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#define MAX_PACKED_COLOR_COMPONENT 255
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inline PRUint8 ClampColor(PRUint32 aColor)
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{
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if (aColor >= MAX_PACKED_COLOR_COMPONENT)
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return MAX_PACKED_COLOR_COMPONENT;
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return aColor;
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}
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PRBool
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nsStyleAnimation::Add(nsStyleCoord& aDest, const nsStyleCoord& aValueToAdd,
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PRUint32 aCount)
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{
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nsStyleUnit commonUnit = GetCommonUnit(aDest.GetUnit(),
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aValueToAdd.GetUnit());
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PRBool success = PR_TRUE;
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switch (commonUnit) {
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case eStyleUnit_Coord: {
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nscoord destCoord = aDest.GetCoordValue();
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nscoord valueToAddCoord = aValueToAdd.GetCoordValue();
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destCoord += aCount * valueToAddCoord;
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aDest.SetCoordValue(destCoord);
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break;
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}
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case eStyleUnit_Percent: {
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float destPct = aDest.GetPercentValue();
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float valueToAddPct = aValueToAdd.GetPercentValue();
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destPct += aCount * valueToAddPct;
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aDest.SetPercentValue(destPct);
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break;
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}
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case eStyleUnit_Color: {
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// Since nscolor doesn't allow out-of-sRGB values, by-animations
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// of colors don't make much sense in our implementation.
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// FIXME: Animation of colors should really use floating point
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// colors (and when it does, ClampColor and the clamping of aCount
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// should go away).
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// Also, given RGBA colors, it's not clear whether we want
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// premultiplication. Probably we don't, given that's hard to
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// premultiply aValueToAdd since it's a difference rather than a
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// value.
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nscolor destColor = aDest.GetColorValue();
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nscolor colorToAdd = aValueToAdd.GetColorValue();
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if (aCount > MAX_PACKED_COLOR_COMPONENT) {
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// Given that we're using integers and clamping at 255, we can
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// clamp aCount to 255 since that's enough to saturate if we're
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// multiplying it by anything nonzero.
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aCount = MAX_PACKED_COLOR_COMPONENT;
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}
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PRUint8 resultR =
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ClampColor(NS_GET_R(destColor) + aCount * NS_GET_R(colorToAdd));
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PRUint8 resultG =
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ClampColor(NS_GET_G(destColor) + aCount * NS_GET_G(colorToAdd));
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PRUint8 resultB =
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ClampColor(NS_GET_B(destColor) + aCount * NS_GET_B(colorToAdd));
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PRUint8 resultA =
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ClampColor(NS_GET_A(destColor) + aCount * NS_GET_A(colorToAdd));
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aDest.SetColorValue(NS_RGBA(resultR, resultG, resultB, resultA));
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break;
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}
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case eStyleUnit_Null:
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NS_WARNING("Unable to find a common unit for given values");
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success = PR_FALSE;
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break;
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default:
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NS_NOTREACHED("Can't add nsStyleCoords using the given common unit");
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success = PR_FALSE;
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break;
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}
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return success;
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}
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PRBool
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nsStyleAnimation::ComputeDistance(const nsStyleCoord& aStartValue,
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const nsStyleCoord& aEndValue,
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double& aDistance)
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{
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nsStyleUnit commonUnit = GetCommonUnit(aStartValue.GetUnit(),
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aEndValue.GetUnit());
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PRBool success = PR_TRUE;
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switch (commonUnit) {
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case eStyleUnit_Coord: {
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nscoord startCoord = aStartValue.GetCoordValue();
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nscoord endCoord = aEndValue.GetCoordValue();
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aDistance = fabs(double(endCoord - startCoord));
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break;
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}
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case eStyleUnit_Percent: {
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float startPct = aStartValue.GetPercentValue();
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float endPct = aEndValue.GetPercentValue();
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aDistance = fabs(double(endPct - startPct));
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break;
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}
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case eStyleUnit_Color: {
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// http://www.w3.org/TR/smil-animation/#animateColorElement says
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// that we should use Euclidean RGB cube distance. However, we
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// have to extend that to RGBA. For now, we'll just use the
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// Euclidean distance in the (part of the) 4-cube of premultiplied
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// colors.
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// FIXME (spec): The CSS transitions spec doesn't say whether
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// colors are premultiplied, but things work better when they are,
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// so use premultiplication. Spec issue is still open per
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// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
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nscolor startColor = aStartValue.GetColorValue();
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nscolor endColor = aEndValue.GetColorValue();
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// Get a color component on a 0-1 scale, which is much easier to
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// deal with when working with alpha.
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#define GET_COMPONENT(component_, color_) \
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(NS_GET_##component_(color_) * (1.0 / 255.0))
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double startA = GET_COMPONENT(A, startColor);
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double startR = GET_COMPONENT(R, startColor) * startA;
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double startG = GET_COMPONENT(G, startColor) * startA;
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double startB = GET_COMPONENT(B, startColor) * startA;
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double endA = GET_COMPONENT(A, endColor);
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double endR = GET_COMPONENT(R, endColor) * endA;
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double endG = GET_COMPONENT(G, endColor) * endA;
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double endB = GET_COMPONENT(B, endColor) * endA;
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#undef GET_COMPONENT
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double diffA = startA - endA;
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double diffR = startR - endR;
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double diffG = startG - endG;
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double diffB = startB - endB;
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aDistance = sqrt(diffA * diffA + diffR * diffR +
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diffG * diffG + diffB * diffB);
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break;
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}
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case eStyleUnit_Null:
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NS_WARNING("Unable to find a common unit for given values");
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success = PR_FALSE;
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break;
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default:
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NS_NOTREACHED("Can't compute distance using the given common unit");
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success = PR_FALSE;
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break;
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}
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return success;
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}
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PRBool
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nsStyleAnimation::Interpolate(const nsStyleCoord& aStartValue,
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const nsStyleCoord& aEndValue,
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double aPortion,
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nsStyleCoord& aResultValue)
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{
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NS_ABORT_IF_FALSE(aPortion >= 0.0 && aPortion <= 1.0,
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"aPortion out of bounds");
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nsStyleUnit commonUnit = GetCommonUnit(aStartValue.GetUnit(),
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aEndValue.GetUnit());
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// Maybe need a followup method to convert the inputs into the common
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// unit-type, if they don't already match it. (Or would it make sense to do
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// that in GetCommonUnit? in which case maybe ConvertToCommonUnit would be
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// better.)
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PRBool success = PR_TRUE;
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switch (commonUnit) {
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case eStyleUnit_Coord: {
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nscoord startCoord = aStartValue.GetCoordValue();
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nscoord endCoord = aEndValue.GetCoordValue();
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nscoord resultCoord = startCoord +
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NSToCoordRound(aPortion * (endCoord - startCoord));
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aResultValue.SetCoordValue(resultCoord);
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break;
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}
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case eStyleUnit_Percent: {
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float startPct = aStartValue.GetPercentValue();
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float endPct = aEndValue.GetPercentValue();
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float resultPct = startPct + aPortion * (endPct - startPct);
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aResultValue.SetPercentValue(resultPct);
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break;
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}
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case eStyleUnit_Color: {
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double inv = 1.0 - aPortion;
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nscolor startColor = aStartValue.GetColorValue();
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nscolor endColor = aEndValue.GetColorValue();
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// FIXME (spec): The CSS transitions spec doesn't say whether
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// colors are premultiplied, but things work better when they are,
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// so use premultiplication. Spec issue is still open per
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// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
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// To save some math, scale the alpha down to a 0-1 scale, but
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// leave the color components on a 0-255 scale.
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double startA = NS_GET_A(startColor) * (1.0 / 255.0);
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double startR = NS_GET_R(startColor) * startA;
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double startG = NS_GET_G(startColor) * startA;
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double startB = NS_GET_B(startColor) * startA;
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double endA = NS_GET_A(endColor) * (1.0 / 255.0);
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double endR = NS_GET_R(endColor) * endA;
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double endG = NS_GET_G(endColor) * endA;
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double endB = NS_GET_B(endColor) * endA;
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double resAf = (startA * inv + endA * aPortion);
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nscolor resultColor;
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if (resAf == 0.0) {
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resultColor = NS_RGBA(0, 0, 0, 0);
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} else {
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double factor = 1.0 / resAf;
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PRUint8 resA = NSToIntRound(resAf * 255.0);
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PRUint8 resR = NSToIntRound((startR * inv + endR * aPortion) * factor);
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PRUint8 resG = NSToIntRound((startG * inv + endG * aPortion) * factor);
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PRUint8 resB = NSToIntRound((startB * inv + endB * aPortion) * factor);
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resultColor = NS_RGBA(resR, resG, resB, resA);
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}
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aResultValue.SetColorValue(resultColor);
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break;
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}
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case eStyleUnit_Null:
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NS_WARNING("Unable to find a common unit for given values");
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success = PR_FALSE;
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break;
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default:
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NS_NOTREACHED("Can't interpolate using the given common unit");
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success = PR_FALSE;
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break;
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}
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return success;
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}
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already_AddRefed<nsICSSStyleRule>
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BuildStyleRule(nsCSSProperty aProperty,
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nsIContent* aTargetElement,
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const nsAString& aSpecifiedValue)
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{
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// Set up an empty CSS Declaration
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nsCSSDeclaration* declaration = new nsCSSDeclaration();
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if (!declaration) {
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NS_WARNING("Failed to allocate nsCSSDeclaration");
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return nsnull;
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}
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PRBool changed; // ignored, but needed as outparam for ParseProperty
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nsIDocument* doc = aTargetElement->GetOwnerDoc();
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nsCOMPtr<nsIURI> baseURI = aTargetElement->GetBaseURI();
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nsCOMPtr<nsICSSParser> parser;
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nsCOMPtr<nsICSSStyleRule> styleRule;
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// The next statement performs the following, in sequence: Get parser, use
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// parser to parse property, check that parsing succeeded, and build a rule
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// for the resulting declaration. If any of these steps fails, we bail out
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// and delete the declaration.
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if (!declaration->InitializeEmpty() ||
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NS_FAILED(doc->CSSLoader()->GetParserFor(nsnull,
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getter_AddRefs(parser))) ||
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NS_FAILED(parser->ParseProperty(aProperty, aSpecifiedValue,
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doc->GetDocumentURI(), baseURI,
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aTargetElement->NodePrincipal(),
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declaration, &changed)) ||
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// SlotForValue checks whether property parsed w/out CSS parsing errors
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!declaration->SlotForValue(aProperty) ||
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NS_FAILED(NS_NewCSSStyleRule(getter_AddRefs(styleRule), nsnull,
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declaration))) {
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NS_WARNING("failure in BuildStyleRule");
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declaration->RuleAbort(); // deletes declaration
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return nsnull;
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}
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return styleRule.forget();
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}
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inline
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already_AddRefed<nsStyleContext>
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LookupStyleContext(nsIContent* aElement)
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{
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nsIDocument* doc = aElement->GetCurrentDoc();
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nsIPresShell* shell = doc->GetPrimaryShell();
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if (!shell) {
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return nsnull;
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}
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return nsComputedDOMStyle::GetStyleContextForContent(aElement, nsnull, shell);
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}
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PRBool
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nsStyleAnimation::ComputeValue(nsCSSProperty aProperty,
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nsIContent* aTargetElement,
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const nsAString& aSpecifiedValue,
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nsStyleCoord& aComputedValue)
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{
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NS_ABORT_IF_FALSE(aTargetElement, "null target element");
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NS_ABORT_IF_FALSE(aTargetElement->GetCurrentDoc(),
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"we should only be able to actively animate nodes that "
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"are in a document");
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// Look up style context for our target element
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nsRefPtr<nsStyleContext> styleContext = LookupStyleContext(aTargetElement);
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if (!styleContext) {
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return PR_FALSE;
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}
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// Parse specified value into a temporary nsICSSStyleRule
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nsCOMPtr<nsICSSStyleRule> styleRule =
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BuildStyleRule(aProperty, aTargetElement, aSpecifiedValue);
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if (!styleRule) {
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return PR_FALSE;
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}
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// Create a temporary nsStyleContext for the style rule
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nsCOMArray<nsIStyleRule> ruleArray;
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ruleArray.AppendObject(styleRule);
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nsStyleSet* styleSet = styleContext->PresContext()->StyleSet();
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nsRefPtr<nsStyleContext> tmpStyleContext =
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styleSet->ResolveStyleForRules(styleContext->GetParent(),
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styleContext->GetPseudoType(),
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styleContext->GetRuleNode(), ruleArray);
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// Extract computed value of our property from the temporary style rule
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return ExtractComputedValue(aProperty, tmpStyleContext, aComputedValue);
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}
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PRBool
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nsStyleAnimation::UncomputeValue(nsCSSProperty aProperty,
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nsPresContext* aPresContext,
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const nsStyleCoord& aComputedValue,
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nsAString& aSpecifiedValue)
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{
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NS_ABORT_IF_FALSE(aPresContext, "null pres context");
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aSpecifiedValue.Truncate(); // Clear outparam, if it's not already empty
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nsCSSValue value;
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switch (aComputedValue.GetUnit()) {
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case eStyleUnit_Coord: {
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float pxVal = aPresContext->AppUnitsToFloatCSSPixels(
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aComputedValue.GetCoordValue());
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value.SetFloatValue(pxVal, eCSSUnit_Pixel);
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break;
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}
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case eStyleUnit_Percent:
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value.SetPercentValue(aComputedValue.GetPercentValue());
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break;
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case eStyleUnit_Color:
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value.SetColorValue(aComputedValue.GetColorValue());
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break;
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default:
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return PR_FALSE;
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}
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return nsCSSDeclaration::AppendCSSValueToString(aProperty, value,
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aSpecifiedValue);
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}
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inline const void*
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StyleDataAtOffset(const void* aStyleStruct, ptrdiff_t aOffset)
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{
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return reinterpret_cast<const char*>(aStyleStruct) + aOffset;
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}
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inline void*
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StyleDataAtOffset(void* aStyleStruct, ptrdiff_t aOffset)
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{
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return reinterpret_cast<char*>(aStyleStruct) + aOffset;
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}
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PRBool
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nsStyleAnimation::ExtractComputedValue(nsCSSProperty aProperty,
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nsStyleContext* aStyleContext,
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nsStyleCoord& aComputedValue)
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{
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NS_ABORT_IF_FALSE(0 <= aProperty &&
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aProperty < eCSSProperty_COUNT_no_shorthands,
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"bad property");
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const void* styleStruct =
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aStyleContext->GetStyleData(nsCSSProps::kSIDTable[aProperty]);
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ptrdiff_t ssOffset = nsCSSProps::kStyleStructOffsetTable[aProperty];
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NS_ABORT_IF_FALSE(0 <= ssOffset, "must be dealing with animatable property");
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nsStyleAnimType animType = nsCSSProps::kAnimTypeTable[aProperty];
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switch (animType) {
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case eStyleAnimType_Coord:
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aComputedValue = *static_cast<const nsStyleCoord*>(
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StyleDataAtOffset(styleStruct, ssOffset));
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return PR_TRUE;
|
|
case eStyleAnimType_Sides_Top:
|
|
case eStyleAnimType_Sides_Right:
|
|
case eStyleAnimType_Sides_Bottom:
|
|
case eStyleAnimType_Sides_Left:
|
|
PR_STATIC_ASSERT(0 == NS_SIDE_TOP);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Right - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_RIGHT);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Bottom - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_BOTTOM);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Left - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_LEFT);
|
|
aComputedValue = static_cast<const nsStyleSides*>(
|
|
StyleDataAtOffset(styleStruct, ssOffset))->
|
|
Get(animType - eStyleAnimType_Sides_Top);
|
|
return PR_TRUE;
|
|
case eStyleAnimType_nscoord:
|
|
aComputedValue.SetCoordValue(*static_cast<const nscoord*>(
|
|
StyleDataAtOffset(styleStruct, ssOffset)));
|
|
return PR_TRUE;
|
|
case eStyleAnimType_Color:
|
|
aComputedValue.SetColorValue(*static_cast<const nscolor*>(
|
|
StyleDataAtOffset(styleStruct, ssOffset)));
|
|
return PR_TRUE;
|
|
case eStyleAnimType_PaintServer: {
|
|
const nsStyleSVGPaint &paint = *static_cast<const nsStyleSVGPaint*>(
|
|
StyleDataAtOffset(styleStruct, ssOffset));
|
|
// We *could* animate 'none' by treating it as rgba(0, 0, 0, 0),
|
|
// but since SVG doesn't have (or really get along with) rgba()
|
|
// colors, I think we're not supposed to.
|
|
// FIXME: However, at some point in the future, we should animate
|
|
// gradients.
|
|
if (paint.mType == eStyleSVGPaintType_Color) {
|
|
aComputedValue.SetColorValue(paint.mPaint.mColor);
|
|
return PR_TRUE;
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
case eStyleAnimType_None:
|
|
NS_NOTREACHED("shouldn't use on non-animatable properties");
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
|
|
PRBool
|
|
nsStyleAnimation::StoreComputedValue(nsCSSProperty aProperty,
|
|
nsPresContext* aPresContext,
|
|
void* aStyleStruct,
|
|
const nsStyleCoord& aComputedValue)
|
|
{
|
|
NS_ABORT_IF_FALSE(0 <= aProperty &&
|
|
aProperty < eCSSProperty_COUNT_no_shorthands,
|
|
"bad property");
|
|
ptrdiff_t ssOffset = nsCSSProps::kStyleStructOffsetTable[aProperty];
|
|
NS_ABORT_IF_FALSE(0 <= ssOffset, "must be dealing with animatable property");
|
|
nsStyleAnimType animType = nsCSSProps::kAnimTypeTable[aProperty];
|
|
switch (animType) {
|
|
case eStyleAnimType_Coord:
|
|
*static_cast<nsStyleCoord*>(StyleDataAtOffset(aStyleStruct, ssOffset)) =
|
|
aComputedValue;
|
|
return PR_TRUE;
|
|
case eStyleAnimType_Sides_Top:
|
|
case eStyleAnimType_Sides_Right:
|
|
case eStyleAnimType_Sides_Bottom:
|
|
case eStyleAnimType_Sides_Left: {
|
|
PR_STATIC_ASSERT(0 == NS_SIDE_TOP);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Right - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_RIGHT);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Bottom - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_BOTTOM);
|
|
PR_STATIC_ASSERT(eStyleAnimType_Sides_Left - eStyleAnimType_Sides_Top
|
|
== NS_SIDE_LEFT);
|
|
static_cast<nsStyleSides*>(StyleDataAtOffset(aStyleStruct, ssOffset))->
|
|
Set(animType - eStyleAnimType_Sides_Top, aComputedValue);
|
|
|
|
nsStyleStructID sid = nsCSSProps::kSIDTable[aProperty];
|
|
if (sid == eStyleStruct_Margin) {
|
|
static_cast<nsStyleMargin*>(aStyleStruct)->RecalcData();
|
|
} else if (sid == eStyleStruct_Padding) {
|
|
static_cast<nsStylePadding*>(aStyleStruct)->RecalcData();
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
case eStyleAnimType_nscoord:
|
|
*static_cast<nscoord*>(StyleDataAtOffset(aStyleStruct, ssOffset)) =
|
|
aComputedValue.GetCoordValue();
|
|
if (aProperty == eCSSProperty_font) {
|
|
nsStyleFont *font = static_cast<nsStyleFont*>(aStyleStruct);
|
|
if (!aPresContext->IsChrome()) {
|
|
nscoord minimumFontSize =
|
|
aPresContext->GetCachedIntPref(kPresContext_MinimumFontSize);
|
|
font->mFont.size = PR_MAX(font->mSize, minimumFontSize);
|
|
} else {
|
|
font->mFont.size = font->mSize;
|
|
}
|
|
}
|
|
return PR_TRUE;
|
|
case eStyleAnimType_Color:
|
|
*static_cast<nscolor*>(StyleDataAtOffset(aStyleStruct, ssOffset)) =
|
|
aComputedValue.GetColorValue();
|
|
return PR_TRUE;
|
|
case eStyleAnimType_PaintServer: {
|
|
nsStyleSVGPaint &paint = *static_cast<nsStyleSVGPaint*>(
|
|
StyleDataAtOffset(aStyleStruct, ssOffset));
|
|
paint.mType = eStyleSVGPaintType_Color;
|
|
paint.mPaint.mColor = aComputedValue.GetColorValue();
|
|
return PR_TRUE;
|
|
}
|
|
case eStyleAnimType_None:
|
|
NS_NOTREACHED("shouldn't use on non-animatable properties");
|
|
}
|
|
return PR_FALSE;
|
|
}
|