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gecko/layout/style/nsStyleAnimation.cpp

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/* -*- Mode: C++; 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 nsStyleAnimation.
*
* The Initial Developer of the Original Code is
* The Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Holbert <dholbert@mozilla.com>, Mozilla Corporation
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
/* Utilities for animation of computed style values */
#include "nsStyleAnimation.h"
#include "nsCOMArray.h"
#include "nsIStyleRule.h"
#include "nsICSSStyleRule.h"
#include "nsString.h"
#include "nsStyleContext.h"
#include "nsStyleSet.h"
#include "nsComputedDOMStyle.h"
#include "nsICSSParser.h"
#include "nsICSSLoader.h"
#include "nsCSSDataBlock.h"
#include "nsCSSDeclaration.h"
#include "nsCSSStruct.h"
#include "prlog.h"
#include <math.h>
// HELPER METHODS
// --------------
/*
* Given two units, this method returns a common unit that they can both be
* converted into, if possible. This is intended to facilitate
* interpolation, distance-computation, and addition between "similar" units.
*
* The ordering of the arguments should not affect the output of this method.
*
* If there's no sensible common unit, this method returns eUnit_Null.
*
* @param aFirstUnit One unit to resolve.
* @param aFirstUnit The other unit to resolve.
* @return A "common" unit that both source units can be converted into, or
* eUnit_Null if that's not possible.
*/
static
nsStyleAnimation::Unit
GetCommonUnit(nsStyleAnimation::Unit aFirstUnit,
nsStyleAnimation::Unit aSecondUnit)
{
// XXXdholbert Naive implementation for now: simply require that the input
// units match.
if (aFirstUnit != aSecondUnit) {
// NOTE: Some unit-pairings will need special handling,
// e.g. percent vs coord (bug 520234)
return nsStyleAnimation::eUnit_Null;
}
return aFirstUnit;
}
// Greatest Common Divisor
static PRUint32
gcd(PRUint32 a, PRUint32 b)
{
// Euclid's algorithm; O(N) in the worst case. (There are better
// ways, but we don't need them for stroke-dasharray animation.)
NS_ABORT_IF_FALSE(a > 0 && b > 0, "positive numbers expected");
while (a != b) {
if (a > b) {
a = a - b;
} else {
b = b - a;
}
}
return a;
}
// Least Common Multiple
static PRUint32
lcm(PRUint32 a, PRUint32 b)
{
// Divide first to reduce overflow risk.
return (a / gcd(a, b)) * b;
}
// CLASS METHODS
// -------------
PRBool
nsStyleAnimation::ComputeDistance(const Value& aStartValue,
const Value& aEndValue,
double& aDistance)
{
Unit commonUnit = GetCommonUnit(aStartValue.GetUnit(), aEndValue.GetUnit());
PRBool success = PR_TRUE;
switch (commonUnit) {
case eUnit_Null:
case eUnit_None:
case eUnit_Enumerated:
success = PR_FALSE;
break;
case eUnit_Coord: {
nscoord startCoord = aStartValue.GetCoordValue();
nscoord endCoord = aEndValue.GetCoordValue();
aDistance = fabs(double(endCoord - startCoord));
break;
}
case eUnit_Percent: {
float startPct = aStartValue.GetPercentValue();
float endPct = aEndValue.GetPercentValue();
aDistance = fabs(double(endPct - startPct));
break;
}
case eUnit_Float: {
float startFloat = aStartValue.GetFloatValue();
float endFloat = aEndValue.GetFloatValue();
aDistance = fabs(double(endFloat - startFloat));
break;
}
case eUnit_Color: {
// http://www.w3.org/TR/smil-animation/#animateColorElement says
// that we should use Euclidean RGB cube distance. However, we
// have to extend that to RGBA. For now, we'll just use the
// Euclidean distance in the (part of the) 4-cube of premultiplied
// colors.
// FIXME (spec): The CSS transitions spec doesn't say whether
// colors are premultiplied, but things work better when they are,
// so use premultiplication. Spec issue is still open per
// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
nscolor startColor = aStartValue.GetColorValue();
nscolor endColor = aEndValue.GetColorValue();
// Get a color component on a 0-1 scale, which is much easier to
// deal with when working with alpha.
#define GET_COMPONENT(component_, color_) \
(NS_GET_##component_(color_) * (1.0 / 255.0))
double startA = GET_COMPONENT(A, startColor);
double startR = GET_COMPONENT(R, startColor) * startA;
double startG = GET_COMPONENT(G, startColor) * startA;
double startB = GET_COMPONENT(B, startColor) * startA;
double endA = GET_COMPONENT(A, endColor);
double endR = GET_COMPONENT(R, endColor) * endA;
double endG = GET_COMPONENT(G, endColor) * endA;
double endB = GET_COMPONENT(B, endColor) * endA;
#undef GET_COMPONENT
double diffA = startA - endA;
double diffR = startR - endR;
double diffG = startG - endG;
double diffB = startB - endB;
aDistance = sqrt(diffA * diffA + diffR * diffR +
diffG * diffG + diffB * diffB);
break;
}
case eUnit_Dasharray: {
// NOTE: This produces results on substantially different scales
// for length values and percentage values, which might even be
// mixed in the same property value. This means the result isn't
// particularly useful for paced animation.
// Call AddWeighted to make us lists of the same length.
Value normValue1, normValue2;
if (!AddWeighted(1.0, aStartValue, 0.0, aEndValue, normValue1) ||
!AddWeighted(0.0, aStartValue, 1.0, aEndValue, normValue2)) {
success = PR_FALSE;
break;
}
double distance = 0.0;
const nsCSSValueList *list1 = normValue1.GetCSSValueListValue();
const nsCSSValueList *list2 = normValue2.GetCSSValueListValue();
NS_ABORT_IF_FALSE(!list1 == !list2, "lists should be same length");
while (list1) {
const nsCSSValue &val1 = list1->mValue;
const nsCSSValue &val2 = list2->mValue;
NS_ABORT_IF_FALSE(val1.GetUnit() == val2.GetUnit(),
"unit match should be assured by AddWeighted");
double diff;
switch (val1.GetUnit()) {
case eCSSUnit_Percent:
diff = val1.GetPercentValue() - val2.GetPercentValue();
break;
case eCSSUnit_Number:
diff = val1.GetFloatValue() - val2.GetFloatValue();
break;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "unexpected unit");
return PR_FALSE;
}
distance += diff * diff;
list1 = list1->mNext;
list2 = list2->mNext;
NS_ABORT_IF_FALSE(!list1 == !list2, "lists should be same length");
}
aDistance = sqrt(distance);
break;
}
case eUnit_Shadow: {
// Call AddWeighted to make us lists of the same length.
Value normValue1, normValue2;
if (!AddWeighted(1.0, aStartValue, 0.0, aEndValue, normValue1) ||
!AddWeighted(0.0, aStartValue, 1.0, aEndValue, normValue2)) {
success = PR_FALSE;
break;
}
const nsCSSValueList *shadow1 = normValue1.GetCSSValueListValue();
const nsCSSValueList *shadow2 = normValue2.GetCSSValueListValue();
double distance = 0.0f;
NS_ABORT_IF_FALSE(!shadow1 == !shadow2, "lists should be same length");
while (shadow1) {
nsCSSValue::Array *array1 = shadow1->mValue.GetArrayValue();
nsCSSValue::Array *array2 = shadow2->mValue.GetArrayValue();
for (PRUint32 i = 0; i < 4; ++i) {
NS_ABORT_IF_FALSE(array1->Item(i).GetUnit() == eCSSUnit_Pixel,
"unexpected unit");
NS_ABORT_IF_FALSE(array2->Item(i).GetUnit() == eCSSUnit_Pixel,
"unexpected unit");
double diff = array1->Item(i).GetFloatValue() -
array2->Item(i).GetFloatValue();
distance += diff * diff;
}
const nsCSSValue &color1 = array1->Item(4);
const nsCSSValue &color2 = array2->Item(4);
const nsCSSValue &inset1 = array1->Item(5);
const nsCSSValue &inset2 = array2->Item(5);
// There are only two possible states of the inset value:
// (1) GetUnit() == eCSSUnit_Null
// (2) GetUnit() == eCSSUnit_Enumerated &&
// GetIntValue() == NS_STYLE_BOX_SHADOW_INSET
NS_ABORT_IF_FALSE(color1.GetUnit() == color2.GetUnit() &&
inset1 == inset2,
"AddWeighted should have failed");
if (color1.GetUnit() != eCSSUnit_Null) {
nsStyleAnimation::Value color1Value
(color1.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
nsStyleAnimation::Value color2Value
(color2.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
double colorDistance;
#ifdef DEBUG
PRBool ok =
#endif
nsStyleAnimation::ComputeDistance(color1Value, color2Value,
colorDistance);
NS_ABORT_IF_FALSE(ok, "should not fail");
distance += colorDistance * colorDistance;
}
shadow1 = shadow1->mNext;
shadow2 = shadow2->mNext;
NS_ABORT_IF_FALSE(!shadow1 == !shadow2, "lists should be same length");
}
aDistance = sqrt(distance);
break;
}
default:
NS_NOTREACHED("Can't compute distance using the given common unit");
success = PR_FALSE;
break;
}
return success;
}
#define MAX_PACKED_COLOR_COMPONENT 255
inline PRUint8 ClampColor(double aColor)
{
if (aColor >= MAX_PACKED_COLOR_COMPONENT)
return MAX_PACKED_COLOR_COMPONENT;
if (aColor <= 0.0)
return 0;
return NSToIntRound(aColor);
}
static PRBool
AddShadowItems(double aCoeff1, const nsCSSValue &aValue1,
double aCoeff2, const nsCSSValue &aValue2,
nsCSSValueList **&aResultTail)
{
// X, Y, Radius, Spread, Color, Inset
NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Array,
"wrong unit");
NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Array,
"wrong unit");
nsCSSValue::Array *array1 = aValue1.GetArrayValue();
nsCSSValue::Array *array2 = aValue2.GetArrayValue();
nsRefPtr<nsCSSValue::Array> resultArray = nsCSSValue::Array::Create(6);
if (!resultArray) {
return PR_FALSE;
}
for (PRUint32 i = 0; i < 4; ++i) {
NS_ABORT_IF_FALSE(array1->Item(i).GetUnit() == eCSSUnit_Pixel,
"unexpected unit");
NS_ABORT_IF_FALSE(array2->Item(i).GetUnit() == eCSSUnit_Pixel,
"unexpected unit");
double pixel1 = array1->Item(i).GetFloatValue();
double pixel2 = array2->Item(i).GetFloatValue();
resultArray->Item(i).SetFloatValue(aCoeff1 * pixel1 + aCoeff2 * pixel2,
eCSSUnit_Pixel);
}
const nsCSSValue& color1 = array1->Item(4);
const nsCSSValue& color2 = array2->Item(4);
const nsCSSValue& inset1 = array1->Item(5);
const nsCSSValue& inset2 = array2->Item(5);
if (color1.GetUnit() != color2.GetUnit() ||
inset1.GetUnit() != inset2.GetUnit()) {
// We don't know how to animate between color and no-color, or
// between inset and not-inset.
return PR_FALSE;
}
if (color1.GetUnit() != eCSSUnit_Null) {
nsStyleAnimation::Value color1Value
(color1.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
nsStyleAnimation::Value color2Value
(color2.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
nsStyleAnimation::Value resultColorValue;
#ifdef DEBUG
PRBool ok =
#endif
nsStyleAnimation::AddWeighted(aCoeff1, color1Value, aCoeff2, color2Value,
resultColorValue);
NS_ABORT_IF_FALSE(ok, "should not fail");
resultArray->Item(4).SetColorValue(resultColorValue.GetColorValue());
}
NS_ABORT_IF_FALSE(inset1 == inset2, "should match");
resultArray->Item(5) = inset1;
nsCSSValueList *resultItem = new nsCSSValueList;
if (!resultItem) {
return PR_FALSE;
}
resultItem->mValue.SetArrayValue(resultArray, eCSSUnit_Array);
*aResultTail = resultItem;
aResultTail = &resultItem->mNext;
return PR_TRUE;
}
PRBool
nsStyleAnimation::AddWeighted(double aCoeff1, const Value& aValue1,
double aCoeff2, const Value& aValue2,
Value& aResultValue)
{
Unit commonUnit = GetCommonUnit(aValue1.GetUnit(), aValue2.GetUnit());
// Maybe need a followup method to convert the inputs into the common
// unit-type, if they don't already match it. (Or would it make sense to do
// that in GetCommonUnit? in which case maybe ConvertToCommonUnit would be
// better.)
PRBool success = PR_TRUE;
switch (commonUnit) {
case eUnit_Null:
case eUnit_None:
case eUnit_Enumerated:
success = PR_FALSE;
break;
case eUnit_Coord: {
aResultValue.SetCoordValue(NSToCoordRound(
aCoeff1 * aValue1.GetCoordValue() +
aCoeff2 * aValue2.GetCoordValue()));
break;
}
case eUnit_Percent: {
aResultValue.SetPercentValue(
aCoeff1 * aValue1.GetPercentValue() +
aCoeff2 * aValue2.GetPercentValue());
break;
}
case eUnit_Float: {
aResultValue.SetFloatValue(
aCoeff1 * aValue1.GetFloatValue() +
aCoeff2 * aValue2.GetFloatValue());
break;
}
case eUnit_Color: {
nscolor color1 = aValue1.GetColorValue();
nscolor color2 = aValue2.GetColorValue();
// FIXME (spec): The CSS transitions spec doesn't say whether
// colors are premultiplied, but things work better when they are,
// so use premultiplication. Spec issue is still open per
// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
// To save some math, scale the alpha down to a 0-1 scale, but
// leave the color components on a 0-255 scale.
double A1 = NS_GET_A(color1) * (1.0 / 255.0);
double R1 = NS_GET_R(color1) * A1;
double G1 = NS_GET_G(color1) * A1;
double B1 = NS_GET_B(color1) * A1;
double A2 = NS_GET_A(color2) * (1.0 / 255.0);
double R2 = NS_GET_R(color2) * A2;
double G2 = NS_GET_G(color2) * A2;
double B2 = NS_GET_B(color2) * A2;
double Aresf = (A1 * aCoeff1 + A2 * aCoeff2);
nscolor resultColor;
if (Aresf <= 0.0) {
resultColor = NS_RGBA(0, 0, 0, 0);
} else {
if (Aresf > 1.0) {
Aresf = 1.0;
}
double factor = 1.0 / Aresf;
PRUint8 Ares = NSToIntRound(Aresf * 255.0);
PRUint8 Rres = ClampColor((R1 * aCoeff1 + R2 * aCoeff2) * factor);
PRUint8 Gres = ClampColor((G1 * aCoeff1 + G2 * aCoeff2) * factor);
PRUint8 Bres = ClampColor((B1 * aCoeff1 + B2 * aCoeff2) * factor);
resultColor = NS_RGBA(Rres, Gres, Bres, Ares);
}
aResultValue.SetColorValue(resultColor);
break;
}
case eUnit_Dasharray: {
const nsCSSValueList *list1 = aValue1.GetCSSValueListValue();
const nsCSSValueList *list2 = aValue2.GetCSSValueListValue();
PRUint32 len1 = 0, len2 = 0;
for (const nsCSSValueList *v = list1; v; v = v->mNext) {
++len1;
}
for (const nsCSSValueList *v = list2; v; v = v->mNext) {
++len2;
}
NS_ABORT_IF_FALSE(len1 > 0 && len2 > 0, "unexpected length");
nsAutoPtr<nsCSSValueList> result;
nsCSSValueList **resultTail = getter_Transfers(result);
for (PRUint32 i = 0, i_end = lcm(len1, len2); i != i_end; ++i) {
const nsCSSValue &v1 = list1->mValue;
const nsCSSValue &v2 = list2->mValue;
NS_ABORT_IF_FALSE(v1.GetUnit() == eCSSUnit_Number ||
v1.GetUnit() == eCSSUnit_Percent, "unexpected");
NS_ABORT_IF_FALSE(v2.GetUnit() == eCSSUnit_Number ||
v2.GetUnit() == eCSSUnit_Percent, "unexpected");
if (v1.GetUnit() != v2.GetUnit()) {
// Can't animate between lengths and percentages (until calc()).
return PR_FALSE;
}
nsCSSValueList *item = new nsCSSValueList;
if (!item) {
return PR_FALSE;
}
*resultTail = item;
resultTail = &item->mNext;
if (v1.GetUnit() == eCSSUnit_Number) {
item->mValue.SetFloatValue(aCoeff1 * v1.GetFloatValue() +
aCoeff2 * v2.GetFloatValue(),
eCSSUnit_Number);
} else {
NS_ABORT_IF_FALSE(v1.GetUnit() == eCSSUnit_Percent, "unexpected");
item->mValue.SetPercentValue(aCoeff1 * v1.GetPercentValue() +
aCoeff2 * v2.GetPercentValue());
}
list1 = list1->mNext;
if (!list1) {
list1 = aValue1.GetCSSValueListValue();
}
list2 = list2->mNext;
if (!list2) {
list2 = aValue2.GetCSSValueListValue();
}
}
aResultValue.SetCSSValueListValue(result.forget(), eUnit_Dasharray,
PR_TRUE);
break;
}
case eUnit_Shadow: {
// This is implemented according to:
// http://dev.w3.org/csswg/css3-transitions/#animation-of-property-types-
// and the third item in the summary of:
// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
const nsCSSValueList *shadow1 = aValue1.GetCSSValueListValue();
const nsCSSValueList *shadow2 = aValue2.GetCSSValueListValue();
nsAutoPtr<nsCSSValueList> result;
nsCSSValueList **resultTail = getter_Transfers(result);
while (shadow1 && shadow2) {
if (!AddShadowItems(aCoeff1, shadow1->mValue,
aCoeff2, shadow2->mValue,
resultTail)) {
return PR_FALSE;
}
shadow1 = shadow1->mNext;
shadow2 = shadow2->mNext;
}
if (shadow1 || shadow2) {
const nsCSSValueList *longShadow;
double longCoeff;
if (shadow1) {
longShadow = shadow1;
longCoeff = aCoeff1;
} else {
longShadow = shadow2;
longCoeff = aCoeff2;
}
while (longShadow) {
// Passing coefficients that add to less than 1 produces the
// desired result of interpolating "0 0 0 transparent" with
// the current shadow.
if (!AddShadowItems(longCoeff, longShadow->mValue,
0.0, longShadow->mValue,
resultTail)) {
return PR_FALSE;
break;
}
longShadow = longShadow->mNext;
}
}
aResultValue.SetCSSValueListValue(result.forget(), eUnit_Shadow,
PR_TRUE);
break;
}
default:
NS_NOTREACHED("Can't interpolate using the given common unit");
success = PR_FALSE;
break;
}
return success;
}
already_AddRefed<nsICSSStyleRule>
BuildStyleRule(nsCSSProperty aProperty,
nsIContent* aTargetElement,
const nsAString& aSpecifiedValue)
{
// Set up an empty CSS Declaration
nsCSSDeclaration* declaration = new nsCSSDeclaration();
if (!declaration) {
NS_WARNING("Failed to allocate nsCSSDeclaration");
return nsnull;
}
PRBool changed; // ignored, but needed as outparam for ParseProperty
nsIDocument* doc = aTargetElement->GetOwnerDoc();
nsCOMPtr<nsIURI> baseURI = aTargetElement->GetBaseURI();
nsCOMPtr<nsICSSParser> parser;
nsCOMPtr<nsICSSStyleRule> styleRule;
// The next statement performs the following, in sequence: Get parser, use
// parser to parse property, check that parsing succeeded, and build a rule
// for the resulting declaration. If any of these steps fails, we bail out
// and delete the declaration.
if (!declaration->InitializeEmpty() ||
NS_FAILED(doc->CSSLoader()->GetParserFor(nsnull,
getter_AddRefs(parser))) ||
NS_FAILED(parser->ParseProperty(aProperty, aSpecifiedValue,
doc->GetDocumentURI(), baseURI,
aTargetElement->NodePrincipal(),
declaration, &changed)) ||
// SlotForValue checks whether property parsed w/out CSS parsing errors
!declaration->SlotForValue(aProperty) ||
NS_FAILED(NS_NewCSSStyleRule(getter_AddRefs(styleRule), nsnull,
declaration))) {
NS_WARNING("failure in BuildStyleRule");
declaration->RuleAbort(); // deletes declaration
return nsnull;
}
return styleRule.forget();
}
inline
already_AddRefed<nsStyleContext>
LookupStyleContext(nsIContent* aElement)
{
nsIDocument* doc = aElement->GetCurrentDoc();
nsIPresShell* shell = doc->GetPrimaryShell();
if (!shell) {
return nsnull;
}
return nsComputedDOMStyle::GetStyleContextForContent(aElement, nsnull, shell);
}
PRBool
nsStyleAnimation::ComputeValue(nsCSSProperty aProperty,
nsIContent* aTargetElement,
const nsAString& aSpecifiedValue,
Value& aComputedValue)
{
NS_ABORT_IF_FALSE(aTargetElement, "null target element");
NS_ABORT_IF_FALSE(aTargetElement->GetCurrentDoc(),
"we should only be able to actively animate nodes that "
"are in a document");
// Look up style context for our target element
nsRefPtr<nsStyleContext> styleContext = LookupStyleContext(aTargetElement);
if (!styleContext) {
return PR_FALSE;
}
// Parse specified value into a temporary nsICSSStyleRule
nsCOMPtr<nsICSSStyleRule> styleRule =
BuildStyleRule(aProperty, aTargetElement, aSpecifiedValue);
if (!styleRule) {
return PR_FALSE;
}
// Create a temporary nsStyleContext for the style rule
nsCOMArray<nsIStyleRule> ruleArray;
ruleArray.AppendObject(styleRule);
nsStyleSet* styleSet = styleContext->PresContext()->StyleSet();
nsRefPtr<nsStyleContext> tmpStyleContext =
styleSet->ResolveStyleForRules(styleContext->GetParent(),
styleContext->GetPseudoType(),
styleContext->GetRuleNode(), ruleArray);
// Extract computed value of our property from the temporary style rule
return ExtractComputedValue(aProperty, tmpStyleContext, aComputedValue);
}
PRBool
nsStyleAnimation::UncomputeValue(nsCSSProperty aProperty,
nsPresContext* aPresContext,
const Value& aComputedValue,
void* aSpecifiedValue)
{
NS_ABORT_IF_FALSE(aPresContext, "null pres context");
switch (aComputedValue.GetUnit()) {
case eUnit_None:
if (nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_PaintServer) {
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] ==
eCSSType_ValuePair, "type mismatch");
static_cast<nsCSSValuePair*>(aSpecifiedValue)->
SetBothValuesTo(nsCSSValue(eCSSUnit_None));
} else {
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
static_cast<nsCSSValue*>(aSpecifiedValue)->SetNoneValue();
}
break;
case eUnit_Enumerated:
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
static_cast<nsCSSValue*>(aSpecifiedValue)->
SetIntValue(aComputedValue.GetIntValue(), eCSSUnit_Enumerated);
break;
case eUnit_Coord: {
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
float pxVal = aPresContext->AppUnitsToFloatCSSPixels(
aComputedValue.GetCoordValue());
static_cast<nsCSSValue*>(aSpecifiedValue)->
SetFloatValue(pxVal, eCSSUnit_Pixel);
break;
}
case eUnit_Percent:
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
static_cast<nsCSSValue*>(aSpecifiedValue)->
SetPercentValue(aComputedValue.GetPercentValue());
break;
case eUnit_Float:
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
static_cast<nsCSSValue*>(aSpecifiedValue)->
SetFloatValue(aComputedValue.GetFloatValue(), eCSSUnit_Number);
break;
case eUnit_Color:
// colors can be alone, or part of a paint server
if (nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_PaintServer) {
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] ==
eCSSType_ValuePair, "type mismatch");
nsCSSValue val;
val.SetColorValue(aComputedValue.GetColorValue());
static_cast<nsCSSValuePair*>(aSpecifiedValue)->
SetBothValuesTo(val);
} else {
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] == eCSSType_Value,
"type mismatch");
static_cast<nsCSSValue*>(aSpecifiedValue)->
SetColorValue(aComputedValue.GetColorValue());
}
break;
case eUnit_Dasharray:
case eUnit_Shadow:
NS_ABORT_IF_FALSE(nsCSSProps::kTypeTable[aProperty] ==
eCSSType_ValueList, "type mismatch");
*static_cast<nsCSSValueList**>(aSpecifiedValue) =
aComputedValue.GetCSSValueListValue();
break;
default:
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsStyleAnimation::UncomputeValue(nsCSSProperty aProperty,
nsPresContext* aPresContext,
const Value& aComputedValue,
nsAString& aSpecifiedValue)
{
NS_ABORT_IF_FALSE(aPresContext, "null pres context");
aSpecifiedValue.Truncate(); // Clear outparam, if it's not already empty
nsCSSValuePair vp;
nsCSSRect rect;
void *ptr = nsnull;
void *storage;
switch (nsCSSProps::kTypeTable[aProperty]) {
case eCSSType_Value:
storage = &vp.mXValue;
break;
case eCSSType_Rect:
storage = &rect;
break;
case eCSSType_ValuePair:
storage = &vp;
break;
case eCSSType_ValueList:
case eCSSType_ValuePairList:
storage = &ptr;
break;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "unexpected case");
storage = nsnull;
break;
}
nsCSSValue value;
if (!nsStyleAnimation::UncomputeValue(aProperty, aPresContext,
aComputedValue, storage)) {
return PR_FALSE;
}
return nsCSSDeclaration::AppendStorageToString(aProperty, storage,
aSpecifiedValue);
}
inline const void*
StyleDataAtOffset(const void* aStyleStruct, ptrdiff_t aOffset)
{
return reinterpret_cast<const char*>(aStyleStruct) + aOffset;
}
inline void*
StyleDataAtOffset(void* aStyleStruct, ptrdiff_t aOffset)
{
return reinterpret_cast<char*>(aStyleStruct) + aOffset;
}
static void
ExtractBorderColor(nsStyleContext* aStyleContext, const void* aStyleBorder,
PRUint8 aSide, nsStyleAnimation::Value& aComputedValue)
{
nscolor color;
PRBool foreground;
static_cast<const nsStyleBorder*>(aStyleBorder)->
GetBorderColor(aSide, color, foreground);
if (foreground) {
// FIXME: should add test for this
color = aStyleContext->GetStyleColor()->mColor;
}
aComputedValue.SetColorValue(color);
}
static PRBool
StyleCoordToValue(const nsStyleCoord& aCoord, nsStyleAnimation::Value& aValue)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Null:
return PR_FALSE;
case eStyleUnit_Normal:
aValue.SetNormalValue();
break;
case eStyleUnit_Auto:
aValue.SetAutoValue();
break;
case eStyleUnit_None:
aValue.SetNoneValue();
break;
case eStyleUnit_Percent:
aValue.SetPercentValue(aCoord.GetPercentValue());
break;
case eStyleUnit_Factor:
aValue.SetFloatValue(aCoord.GetFactorValue());
break;
case eStyleUnit_Coord:
aValue.SetCoordValue(aCoord.GetCoordValue());
break;
case eStyleUnit_Enumerated:
aValue.SetIntValue(aCoord.GetIntValue(),
nsStyleAnimation::eUnit_Enumerated);
case eStyleUnit_Integer:
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsStyleAnimation::ExtractComputedValue(nsCSSProperty aProperty,
nsStyleContext* aStyleContext,
Value& aComputedValue)
{
NS_ABORT_IF_FALSE(0 <= aProperty &&
aProperty < eCSSProperty_COUNT_no_shorthands,
"bad property");
const void* styleStruct =
aStyleContext->GetStyleData(nsCSSProps::kSIDTable[aProperty]);
ptrdiff_t ssOffset = nsCSSProps::kStyleStructOffsetTable[aProperty];
nsStyleAnimType animType = nsCSSProps::kAnimTypeTable[aProperty];
NS_ABORT_IF_FALSE(0 <= ssOffset || animType == eStyleAnimType_Custom,
"must be dealing with animatable property");
switch (animType) {
case eStyleAnimType_Custom:
switch (aProperty) {
// For border-width, ignore the border-image business (which
// only exists until we update our implementation to the current
// spec) and use GetComputedBorder
#define BORDER_WIDTH_CASE(prop_, side_) \
case prop_: \
aComputedValue.SetCoordValue( \
static_cast<const nsStyleBorder*>(styleStruct)-> \
GetComputedBorder().side_); \
break;
BORDER_WIDTH_CASE(eCSSProperty_border_bottom_width, bottom)
BORDER_WIDTH_CASE(eCSSProperty_border_left_width_value, left)
BORDER_WIDTH_CASE(eCSSProperty_border_right_width_value, right)
BORDER_WIDTH_CASE(eCSSProperty_border_top_width, top)
#undef BORDER_WIDTH_CASE
case eCSSProperty_border_bottom_color:
ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_BOTTOM,
aComputedValue);
break;
case eCSSProperty_border_left_color_value:
ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_LEFT,
aComputedValue);
break;
case eCSSProperty_border_right_color_value:
ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_RIGHT,
aComputedValue);
break;
case eCSSProperty_border_top_color:
ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_TOP,
aComputedValue);
break;
case eCSSProperty_outline_color: {
const nsStyleOutline *styleOutline =
static_cast<const nsStyleOutline*>(styleStruct);
nscolor color;
#ifdef GFX_HAS_INVERT
styleOutline->GetOutlineColor(color);
#else
if (!styleOutline->GetOutlineColor(color))
color = aStyleContext->GetStyleColor()->mColor;
#endif
aComputedValue.SetColorValue(color);
break;
}
case eCSSProperty_stroke_dasharray: {
const nsStyleSVG *svg = static_cast<const nsStyleSVG*>(styleStruct);
NS_ABORT_IF_FALSE((svg->mStrokeDasharray != nsnull) ==
(svg->mStrokeDasharrayLength != 0),
"pointer/length mismatch");
if (svg->mStrokeDasharray) {
nsAutoPtr<nsCSSValueList> result;
nsCSSValueList **resultTail = getter_Transfers(result);
for (PRUint32 i = 0, i_end = svg->mStrokeDasharrayLength;
i != i_end; ++i) {
nsCSSValueList *item = new nsCSSValueList;
if (!item) {
return PR_FALSE;
}
*resultTail = item;
resultTail = &item->mNext;
const nsStyleCoord &coord = svg->mStrokeDasharray[i];
nsCSSValue &value = item->mValue;
switch (coord.GetUnit()) {
case eStyleUnit_Coord:
// Number means the same thing as length; we want to
// animate them the same way. Normalize both to number
// since it has more accuracy (float vs nscoord).
value.SetFloatValue(nsPresContext::
AppUnitsToFloatCSSPixels(coord.GetCoordValue()),
eCSSUnit_Number);
break;
case eStyleUnit_Factor:
value.SetFloatValue(coord.GetFactorValue(),
eCSSUnit_Number);
break;
case eStyleUnit_Percent:
value.SetPercentValue(coord.GetPercentValue());
break;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "unexpected unit");
return PR_FALSE;
}
}
aComputedValue.SetCSSValueListValue(result.forget(),
eUnit_Dasharray, PR_TRUE);
} else {
aComputedValue.SetNoneValue();
}
break;
}
default:
NS_ABORT_IF_FALSE(PR_FALSE, "missing property implementation");
return PR_FALSE;
};
return PR_TRUE;
case eStyleAnimType_Coord:
return StyleCoordToValue(*static_cast<const nsStyleCoord*>(
StyleDataAtOffset(styleStruct, ssOffset)), aComputedValue);
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);
const nsStyleCoord &coord = static_cast<const nsStyleSides*>(
StyleDataAtOffset(styleStruct, ssOffset))->
Get(animType - eStyleAnimType_Sides_Top);
return StyleCoordToValue(coord, aComputedValue);
}
case eStyleAnimType_nscoord:
aComputedValue.SetCoordValue(*static_cast<const nscoord*>(
StyleDataAtOffset(styleStruct, ssOffset)));
return PR_TRUE;
case eStyleAnimType_EnumU8:
aComputedValue.SetIntValue(*static_cast<const PRUint8*>(
StyleDataAtOffset(styleStruct, ssOffset)), eUnit_Enumerated);
return PR_TRUE;
case eStyleAnimType_float:
aComputedValue.SetFloatValue(*static_cast<const float*>(
StyleDataAtOffset(styleStruct, ssOffset)));
if (aProperty == eCSSProperty_font_size_adjust &&
aComputedValue.GetFloatValue() == 0.0f) {
// In nsStyleFont, we set mFont.sizeAdjust to 0 to represent
// font-size-adjust: none. Here, we have to treat this as a keyword
// instead of a float value, to make sure we don't end up doing
// interpolation with it.
aComputedValue.SetNoneValue();
}
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));
// FIXME: At some point in the future, we should animate gradients.
if (paint.mType == eStyleSVGPaintType_Color) {
aComputedValue.SetColorValue(paint.mPaint.mColor);
return PR_TRUE;
}
if (paint.mType == eStyleSVGPaintType_None) {
aComputedValue.SetNoneValue();
return PR_TRUE;
}
return PR_FALSE;
}
case eStyleAnimType_Shadow: {
const nsCSSShadowArray *shadowArray =
*static_cast<const nsRefPtr<nsCSSShadowArray>*>(
StyleDataAtOffset(styleStruct, ssOffset));
if (!shadowArray) {
aComputedValue.SetCSSValueListValue(nsnull, eUnit_Shadow, PR_TRUE);
return PR_TRUE;
}
nsAutoPtr<nsCSSValueList> result;
nsCSSValueList **resultTail = getter_Transfers(result);
for (PRUint32 i = 0, i_end = shadowArray->Length(); i < i_end; ++i) {
const nsCSSShadowItem *shadow = shadowArray->ShadowAt(i);
// X, Y, Radius, Spread, Color, Inset
nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(6);
arr->Item(0).SetFloatValue(
nsPresContext::AppUnitsToFloatCSSPixels(shadow->mXOffset),
eCSSUnit_Pixel);
arr->Item(1).SetFloatValue(
nsPresContext::AppUnitsToFloatCSSPixels(shadow->mYOffset),
eCSSUnit_Pixel);
arr->Item(2).SetFloatValue(
nsPresContext::AppUnitsToFloatCSSPixels(shadow->mRadius),
eCSSUnit_Pixel);
// NOTE: This code sometimes stores mSpread: 0 even when
// the parser would be required to leave it null.
arr->Item(3).SetFloatValue(
nsPresContext::AppUnitsToFloatCSSPixels(shadow->mSpread),
eCSSUnit_Pixel);
if (shadow->mHasColor) {
arr->Item(4).SetColorValue(shadow->mColor);
}
if (shadow->mInset) {
arr->Item(5).SetIntValue(NS_STYLE_BOX_SHADOW_INSET,
eCSSUnit_Enumerated);
}
nsCSSValueList *resultItem = new nsCSSValueList;
if (!resultItem) {
return PR_FALSE;
}
resultItem->mValue.SetArrayValue(arr, eCSSUnit_Array);
*resultTail = resultItem;
resultTail = &resultItem->mNext;
}
aComputedValue.SetCSSValueListValue(result.forget(), eUnit_Shadow,
PR_TRUE);
return PR_TRUE;
}
case eStyleAnimType_None:
NS_NOTREACHED("shouldn't use on non-animatable properties");
}
return PR_FALSE;
}
nsStyleAnimation::Value::Value(PRInt32 aInt, EnumeratedConstructorType)
{
mUnit = eUnit_Enumerated;
mValue.mInt = aInt;
}
nsStyleAnimation::Value::Value(nscoord aLength, CoordConstructorType)
{
mUnit = eUnit_Coord;
mValue.mCoord = aLength;
}
nsStyleAnimation::Value::Value(float aPercent, PercentConstructorType)
{
mUnit = eUnit_Percent;
mValue.mFloat = aPercent;
}
nsStyleAnimation::Value::Value(float aFloat, FloatConstructorType)
{
mUnit = eUnit_Float;
mValue.mFloat = aFloat;
}
nsStyleAnimation::Value::Value(nscolor aColor, ColorConstructorType)
{
mUnit = eUnit_Color;
mValue.mColor = aColor;
}
nsStyleAnimation::Value&
nsStyleAnimation::Value::operator=(const Value& aOther)
{
FreeValue();
mUnit = aOther.mUnit;
switch (mUnit) {
case eUnit_Null:
case eUnit_Normal:
case eUnit_Auto:
case eUnit_None:
break;
case eUnit_Enumerated:
mValue.mInt = aOther.mValue.mInt;
break;
case eUnit_Coord:
mValue.mCoord = aOther.mValue.mCoord;
break;
case eUnit_Percent:
case eUnit_Float:
mValue.mFloat = aOther.mValue.mFloat;
break;
case eUnit_Color:
mValue.mColor = aOther.mValue.mColor;
break;
case eUnit_Dasharray:
case eUnit_Shadow:
mValue.mCSSValueList = aOther.mValue.mCSSValueList
? aOther.mValue.mCSSValueList->Clone() : nsnull;
}
return *this;
}
void
nsStyleAnimation::Value::SetNormalValue()
{
FreeValue();
mUnit = eUnit_Normal;
}
void
nsStyleAnimation::Value::SetAutoValue()
{
FreeValue();
mUnit = eUnit_Auto;
}
void
nsStyleAnimation::Value::SetNoneValue()
{
FreeValue();
mUnit = eUnit_None;
}
void
nsStyleAnimation::Value::SetIntValue(PRInt32 aInt, Unit aUnit)
{
FreeValue();
mUnit = aUnit;
mValue.mInt = aInt;
}
void
nsStyleAnimation::Value::SetCoordValue(nscoord aLength)
{
FreeValue();
mUnit = eUnit_Coord;
mValue.mCoord = aLength;
}
void
nsStyleAnimation::Value::SetPercentValue(float aPercent)
{
FreeValue();
mUnit = eUnit_Percent;
mValue.mFloat = aPercent;
}
void
nsStyleAnimation::Value::SetFloatValue(float aFloat)
{
FreeValue();
mUnit = eUnit_Float;
mValue.mFloat = aFloat;
}
void
nsStyleAnimation::Value::SetColorValue(nscolor aColor)
{
FreeValue();
mUnit = eUnit_Color;
mValue.mColor = aColor;
}
void
nsStyleAnimation::Value::SetCSSValueListValue(nsCSSValueList *aValueList,
Unit aUnit,
PRBool aTakeOwnership)
{
FreeValue();
NS_ASSERTION(IsCSSValueListUnit(aUnit), "bad unit");
mUnit = aUnit;
if (aTakeOwnership) {
mValue.mCSSValueList = aValueList;
} else {
mValue.mCSSValueList = aValueList ? aValueList->Clone() : nsnull;
}
}
void
nsStyleAnimation::Value::FreeValue()
{
if (IsCSSValueListUnit(mUnit)) {
delete mValue.mCSSValueList;
}
}
PRBool
nsStyleAnimation::Value::operator==(const Value& aOther) const
{
if (mUnit != aOther.mUnit) {
return PR_FALSE;
}
switch (mUnit) {
case eUnit_Null:
case eUnit_Normal:
case eUnit_Auto:
case eUnit_None:
return PR_TRUE;
case eUnit_Enumerated:
return mValue.mInt == aOther.mValue.mInt;
case eUnit_Coord:
return mValue.mCoord == aOther.mValue.mCoord;
case eUnit_Percent:
case eUnit_Float:
return mValue.mFloat == aOther.mValue.mFloat;
case eUnit_Color:
return mValue.mColor == aOther.mValue.mColor;
case eUnit_Dasharray:
case eUnit_Shadow:
return nsCSSValueList::Equal(mValue.mCSSValueList,
aOther.mValue.mCSSValueList);
}
NS_NOTREACHED("incomplete case");
return PR_FALSE;
}
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