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gecko/layout/style/nsCSSDataBlock.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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 nsCSSDataBlock.cpp.
*
* The Initial Developer of the Original Code is L. David Baron.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org> (original author)
*
* 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 ***** */
/*
* compact representation of the property-value pairs within a CSS
* declaration, and the code for expanding and compacting it
*/
#include "nsCSSDataBlock.h"
#include "nsCSSProps.h"
#include "nsRuleData.h"
#include "nsRuleNode.h"
#include "nsStyleSet.h"
#include "nsStyleContext.h"
/*
* nsCSSCompressedDataBlock holds property-value pairs corresponding to
* CSS declaration blocks. The value is stored in one of the five CSS
* data types: nsCSSValue, nsCSSRect, nsCSSValueList, nsCSSValuePair,
* and nsCSSValuePairList, which each correspond to a value of the
* nsCSSType enumeration.
*
* The storage strategy uses the CDB*Storage structs below to help
* ensure that all the types remain properly aligned. nsCSSValue's
* alignment requirements cannot be weaker than any others, since it
* contains a pointer and an enumeration.
*
* The simple types, nsCSSValue and nsCSSRect have the nsCSSValue or
* nsCSSRect objects stored in the block. The list types have only a
* pointer to the first element in the list stored in the block.
*/
struct CDBValueStorage {
nsCSSProperty property;
nsCSSValue value;
};
struct CDBRectStorage {
nsCSSProperty property;
nsCSSRect value;
};
struct CDBValuePairStorage {
nsCSSProperty property;
nsCSSValuePair value;
};
struct CDBPointerStorage {
nsCSSProperty property;
void *value;
};
enum {
CDBValueStorage_advance = sizeof(CDBValueStorage),
CDBRectStorage_advance = sizeof(CDBRectStorage),
CDBValuePairStorage_advance = sizeof(CDBValuePairStorage),
// round up using the closest estimate we can get of the alignment
// requirements of nsCSSValue:
CDBPointerStorage_advance = PR_ROUNDUP(sizeof(CDBPointerStorage),
sizeof(CDBValueStorage) - sizeof(nsCSSValue))
};
/*
* Define a bunch of utility functions for getting the property or any
* of the value types when the cursor is at the beginning of the storage
* for the property-value pair. The versions taking a non-const cursor
* argument return a reference so that the caller can assign into the
* result.
*/
inline nsCSSProperty& PropertyAtCursor(char *aCursor) {
return *reinterpret_cast<nsCSSProperty*>(aCursor);
}
inline nsCSSProperty PropertyAtCursor(const char *aCursor) {
return *reinterpret_cast<const nsCSSProperty*>(aCursor);
}
inline nsCSSValue* ValueAtCursor(char *aCursor) {
return & reinterpret_cast<CDBValueStorage*>(aCursor)->value;
}
inline const nsCSSValue* ValueAtCursor(const char *aCursor) {
return & reinterpret_cast<const CDBValueStorage*>(aCursor)->value;
}
inline nsCSSRect* RectAtCursor(char *aCursor) {
return & reinterpret_cast<CDBRectStorage*>(aCursor)->value;
}
inline const nsCSSRect* RectAtCursor(const char *aCursor) {
return & reinterpret_cast<const CDBRectStorage*>(aCursor)->value;
}
inline nsCSSValuePair* ValuePairAtCursor(char *aCursor) {
return & reinterpret_cast<CDBValuePairStorage*>(aCursor)->value;
}
inline const nsCSSValuePair* ValuePairAtCursor(const char *aCursor) {
return & reinterpret_cast<const CDBValuePairStorage*>(aCursor)->value;
}
inline void*& PointerAtCursor(char *aCursor) {
return reinterpret_cast<CDBPointerStorage*>(aCursor)->value;
}
inline void* PointerAtCursor(const char *aCursor) {
return reinterpret_cast<const CDBPointerStorage*>(aCursor)->value;
}
inline nsCSSValueList*& ValueListAtCursor(char *aCursor) {
return * reinterpret_cast<nsCSSValueList**>
(& reinterpret_cast<CDBPointerStorage*>(aCursor)->value);
}
inline nsCSSValueList* ValueListAtCursor(const char *aCursor) {
return static_cast<nsCSSValueList*>
(reinterpret_cast<const CDBPointerStorage*>(aCursor)->value);
}
inline nsCSSValuePairList*& ValuePairListAtCursor(char *aCursor) {
return * reinterpret_cast<nsCSSValuePairList**>
(& reinterpret_cast<CDBPointerStorage*>(aCursor)->value);
}
inline nsCSSValuePairList* ValuePairListAtCursor(const char *aCursor) {
return static_cast<nsCSSValuePairList*>
(reinterpret_cast<const CDBPointerStorage*>(aCursor)->value);
}
static PRBool
ShouldIgnoreColors(nsRuleData *aRuleData)
{
return aRuleData->mLevel != nsStyleSet::eAgentSheet &&
aRuleData->mLevel != nsStyleSet::eUserSheet &&
!aRuleData->mPresContext->UseDocumentColors();
}
/**
* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
* Image sources are specified by |url()| or |-moz-image-rect()| function.
*/
static void
TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument)
{
if (aValue.GetUnit() == eCSSUnit_URL) {
aValue.StartImageLoad(aDocument);
}
else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
nsCSSValue::Array* arguments = aValue.GetArrayValue();
NS_ABORT_IF_FALSE(arguments->Count() == 6, "unexpected num of arguments");
const nsCSSValue& image = arguments->Item(1);
if (image.GetUnit() == eCSSUnit_URL)
image.StartImageLoad(aDocument);
}
}
static void
TryToStartImageLoad(const nsCSSValue& aValue, nsIDocument* aDocument,
nsCSSProperty aProperty)
{
if (nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_IMAGE_IS_IN_ARRAY_0)) {
if (aValue.GetUnit() == eCSSUnit_Array) {
TryToStartImageLoadOnValue(aValue.GetArrayValue()->Item(0), aDocument);
}
} else {
TryToStartImageLoadOnValue(aValue, aDocument);
}
}
static inline PRBool
ShouldStartImageLoads(nsRuleData *aRuleData, nsCSSProperty aProperty)
{
// Don't initiate image loads for if-visited styles. This is
// important because:
// (1) it's a waste of CPU and bandwidth
// (2) in some cases we'd start the image load on a style change
// where we wouldn't have started the load initially, which makes
// which links are visited detectable to Web pages (see bug
// 557287)
return !aRuleData->mStyleContext->IsStyleIfVisited() &&
nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_START_IMAGE_LOADS);
}
void
nsCSSCompressedDataBlock::MapRuleInfoInto(nsRuleData *aRuleData) const
{
// If we have no data for these structs, then return immediately.
// This optimization should make us return most of the time, so we
// have to worry much less (although still some) about the speed of
// the rest of the function.
if (!(aRuleData->mSIDs & mStyleBits))
return;
nsIDocument* doc = aRuleData->mPresContext->Document();
const char* cursor = Block();
const char* cursor_end = BlockEnd();
while (cursor < cursor_end) {
nsCSSProperty iProp = PropertyAtCursor(cursor);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
if (nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]) &
aRuleData->mSIDs) {
void *prop = aRuleData->StorageFor(iProp);
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
nsCSSValue* target = static_cast<nsCSSValue*>(prop);
if (target->GetUnit() == eCSSUnit_Null) {
const nsCSSValue *val = ValueAtCursor(cursor);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null, "oops");
if (ShouldStartImageLoads(aRuleData, iProp)) {
TryToStartImageLoad(*val, doc, iProp);
}
*target = *val;
if (iProp == eCSSProperty_font_family) {
// XXX Are there other things like this?
aRuleData->mFontData->mFamilyFromHTML = PR_FALSE;
}
if (nsCSSProps::PropHasFlags(iProp,
CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED) &&
ShouldIgnoreColors(aRuleData))
{
if (iProp == eCSSProperty_background_color) {
// Force non-'transparent' background
// colors to the user's default.
if (target->IsNonTransparentColor()) {
target->SetColorValue(aRuleData->
mPresContext->
DefaultBackgroundColor());
}
} else {
// Ignore 'color', 'border-*-color', etc.
*target = nsCSSValue();
}
}
}
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
NS_ABORT_IF_FALSE(!nsCSSProps::PropHasFlags(iProp,
CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED),
"this case needs to handle color properties");
const nsCSSRect* val = RectAtCursor(cursor);
NS_ASSERTION(val->HasValue(), "oops");
nsCSSRect* target = static_cast<nsCSSRect*>(prop);
if (target->mTop.GetUnit() == eCSSUnit_Null)
target->mTop = val->mTop;
if (target->mRight.GetUnit() == eCSSUnit_Null)
target->mRight = val->mRight;
if (target->mBottom.GetUnit() == eCSSUnit_Null)
target->mBottom = val->mBottom;
if (target->mLeft.GetUnit() == eCSSUnit_Null)
target->mLeft = val->mLeft;
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
NS_ABORT_IF_FALSE(!nsCSSProps::PropHasFlags(iProp,
CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED),
"this case needs to handle color properties");
const nsCSSValuePair* val = ValuePairAtCursor(cursor);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null, "oops");
nsCSSValuePair* target = static_cast<nsCSSValuePair*>(prop);
NS_ASSERTION((target->mXValue.GetUnit() == eCSSUnit_Null)
== (target->mYValue.GetUnit() == eCSSUnit_Null),
"half a property?");
if (target->mXValue.GetUnit() == eCSSUnit_Null) {
target->mXValue = val->mXValue;
target->mYValue = val->mYValue;
}
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
void** target = static_cast<void**>(prop);
if (!*target) {
if (ShouldStartImageLoads(aRuleData, iProp)) {
for (nsCSSValueList* l = ValueListAtCursor(cursor);
l; l = l->mNext) {
TryToStartImageLoad(l->mValue, doc, iProp);
}
}
void* val = PointerAtCursor(cursor);
NS_ASSERTION(val, "oops");
*target = val;
if (nsCSSProps::PropHasFlags(iProp,
CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED) &&
ShouldIgnoreColors(aRuleData))
{
*target = nsnull;
}
}
cursor += CDBPointerStorage_advance;
} break;
}
} else {
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
cursor += CDBPointerStorage_advance;
} break;
}
}
}
NS_ASSERTION(cursor == cursor_end, "inconsistent data");
}
const void*
nsCSSCompressedDataBlock::StorageFor(nsCSSProperty aProperty) const
{
NS_PRECONDITION(!nsCSSProps::IsShorthand(aProperty),
"Don't call for shorthands");
// If we have no data for this struct, then return immediately.
// This optimization should make us return most of the time, so we
// have to worry much less (although still some) about the speed of
// the rest of the function.
if (!(nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[aProperty]) &
mStyleBits))
return nsnull;
const char* cursor = Block();
const char* cursor_end = BlockEnd();
while (cursor < cursor_end) {
nsCSSProperty iProp = PropertyAtCursor(cursor);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
if (iProp == aProperty) {
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
return ValueAtCursor(cursor);
}
case eCSSType_Rect: {
return RectAtCursor(cursor);
}
case eCSSType_ValuePair: {
return ValuePairAtCursor(cursor);
}
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
return &PointerAtCursor(const_cast<char*>(cursor));
}
}
}
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
cursor += CDBPointerStorage_advance;
} break;
}
}
NS_ASSERTION(cursor == cursor_end, "inconsistent data");
return nsnull;
}
already_AddRefed<nsCSSCompressedDataBlock>
nsCSSCompressedDataBlock::Clone() const
{
const char *cursor = Block(), *cursor_end = BlockEnd();
char *result_cursor;
nsCSSCompressedDataBlock *result =
new(cursor_end - cursor) nsCSSCompressedDataBlock();
if (!result)
return nsnull;
result_cursor = result->Block();
while (cursor < cursor_end) {
nsCSSProperty iProp = PropertyAtCursor(cursor);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
PropertyAtCursor(result_cursor) = iProp;
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
const nsCSSValue* val = ValueAtCursor(cursor);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null, "oops");
nsCSSValue *result_val = ValueAtCursor(result_cursor);
new (result_val) nsCSSValue(*val);
cursor += CDBValueStorage_advance;
result_cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
const nsCSSRect* val = RectAtCursor(cursor);
NS_ASSERTION(val->HasValue(), "oops");
nsCSSRect* result_val = RectAtCursor(result_cursor);
new (result_val) nsCSSRect(*val);
cursor += CDBRectStorage_advance;
result_cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
const nsCSSValuePair* val = ValuePairAtCursor(cursor);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null, "oops");
nsCSSValuePair* result_val = ValuePairAtCursor(result_cursor);
new (result_val) nsCSSValuePair(*val);
cursor += CDBValuePairStorage_advance;
result_cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
void *copy;
NS_ASSERTION(PointerAtCursor(cursor), "oops");
switch (nsCSSProps::kTypeTable[iProp]) {
default:
NS_NOTREACHED("unreachable");
// fall through to keep gcc's uninitialized
// variable warning quiet
case eCSSType_ValueList:
copy = ValueListAtCursor(cursor)->Clone();
break;
case eCSSType_ValuePairList:
copy = ValuePairListAtCursor(cursor)->Clone();
break;
}
if (!copy) {
result->mBlockEnd = result_cursor;
result->Destroy();
return nsnull;
}
PointerAtCursor(result_cursor) = copy;
cursor += CDBPointerStorage_advance;
result_cursor += CDBPointerStorage_advance;
} break;
}
}
NS_ASSERTION(cursor == cursor_end, "inconsistent data");
result->mBlockEnd = result_cursor;
result->mStyleBits = mStyleBits;
NS_ASSERTION(result->DataSize() == DataSize(), "wrong size");
result->AddRef();
return result;
}
void
nsCSSCompressedDataBlock::Destroy()
{
const char* cursor = Block();
const char* cursor_end = BlockEnd();
while (cursor < cursor_end) {
nsCSSProperty iProp = PropertyAtCursor(cursor);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
const nsCSSValue* val = ValueAtCursor(cursor);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null, "oops");
val->~nsCSSValue();
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
const nsCSSRect* val = RectAtCursor(cursor);
NS_ASSERTION(val->HasValue(), "oops");
val->~nsCSSRect();
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
const nsCSSValuePair* val = ValuePairAtCursor(cursor);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null, "oops");
val->~nsCSSValuePair();
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList: {
nsCSSValueList* val = ValueListAtCursor(cursor);
NS_ASSERTION(val, "oops");
delete val;
cursor += CDBPointerStorage_advance;
} break;
case eCSSType_ValuePairList: {
nsCSSValuePairList* val = ValuePairListAtCursor(cursor);
NS_ASSERTION(val, "oops");
delete val;
cursor += CDBPointerStorage_advance;
} break;
}
}
NS_ASSERTION(cursor == cursor_end, "inconsistent data");
delete this;
}
/* static */ already_AddRefed<nsCSSCompressedDataBlock>
nsCSSCompressedDataBlock::CreateEmptyBlock()
{
nsCSSCompressedDataBlock *result = new(0) nsCSSCompressedDataBlock();
if (!result)
return nsnull;
result->mBlockEnd = result->Block();
result->AddRef();
return result;
}
/*****************************************************************************/
nsCSSExpandedDataBlock::nsCSSExpandedDataBlock()
{
AssertInitialState();
}
nsCSSExpandedDataBlock::~nsCSSExpandedDataBlock()
{
AssertInitialState();
}
const size_t
nsCSSExpandedDataBlock::kOffsetTable[] = {
#define CSS_PROP(name_, id_, method_, flags_, datastruct_, member_, type_, \
kwtable_, stylestruct_, stylestructoffset_, animtype_) \
offsetof(nsCSSExpandedDataBlock, m##datastruct_.member_),
#include "nsCSSPropList.h"
#undef CSS_PROP
};
void
nsCSSExpandedDataBlock::DoExpand(nsRefPtr<nsCSSCompressedDataBlock> *aBlock,
PRBool aImportant)
{
NS_PRECONDITION(*aBlock, "unexpected null block");
if (!(*aBlock)->IsMutable()) {
// FIXME (maybe): We really don't need to clone the block
// itself, just all the data inside it.
*aBlock = (*aBlock)->Clone();
if (!*aBlock) {
// Not much we can do; just lose the properties.
NS_WARNING("out of memory");
return;
}
NS_ABORT_IF_FALSE((*aBlock)->IsMutable(), "we just cloned it");
}
/*
* Save needless copying and allocation by copying the memory
* corresponding to the stored data in the compressed block, and
* then, to avoid destructors, deleting the compressed block by
* calling |delete| instead of using its |Destroy| method.
*/
const char* cursor = (*aBlock)->Block();
const char* cursor_end = (*aBlock)->BlockEnd();
while (cursor < cursor_end) {
nsCSSProperty iProp = PropertyAtCursor(cursor);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
NS_ASSERTION(!HasPropertyBit(iProp),
"compressed block has property multiple times");
SetPropertyBit(iProp);
if (aImportant)
SetImportantBit(iProp);
void *prop = PropertyAt(iProp);
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
const nsCSSValue* val = ValueAtCursor(cursor);
nsCSSValue* dest = static_cast<nsCSSValue*>(prop);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null, "oops");
NS_ASSERTION(dest->GetUnit() == eCSSUnit_Null,
"expanding into non-empty block");
#ifdef NS_BUILD_REFCNT_LOGGING
dest->~nsCSSValue();
#endif
memcpy(dest, val, sizeof(nsCSSValue));
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
const nsCSSRect* val = RectAtCursor(cursor);
nsCSSRect* dest = static_cast<nsCSSRect*>(prop);
NS_ASSERTION(val->HasValue(), "oops");
NS_ASSERTION(!dest->HasValue(),
"expanding into non-empty block");
#ifdef NS_BUILD_REFCNT_LOGGING
dest->~nsCSSRect();
#endif
memcpy(dest, val, sizeof(nsCSSRect));
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
const nsCSSValuePair* val = ValuePairAtCursor(cursor);
nsCSSValuePair* dest = static_cast<nsCSSValuePair*>(prop);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null, "oops");
NS_ASSERTION(dest->mXValue.GetUnit() == eCSSUnit_Null &&
dest->mYValue.GetUnit() == eCSSUnit_Null,
"expanding into non-empty block");
#ifdef NS_BUILD_REFCNT_LOGGING
dest->~nsCSSValuePair();
#endif
memcpy(dest, val, sizeof(nsCSSValuePair));
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
void* val = PointerAtCursor(cursor);
void** dest = static_cast<void**>(prop);
NS_ASSERTION(val, "oops");
NS_ASSERTION(!*dest, "expanding into non-empty block");
*dest = val;
cursor += CDBPointerStorage_advance;
} break;
}
}
NS_ASSERTION(cursor == cursor_end, "inconsistent data");
NS_ASSERTION((*aBlock)->mRefCnt == 1, "unexpected reference count");
delete aBlock->forget().get();
}
void
nsCSSExpandedDataBlock::Expand(
nsRefPtr<nsCSSCompressedDataBlock> *aNormalBlock,
nsRefPtr<nsCSSCompressedDataBlock> *aImportantBlock)
{
NS_PRECONDITION(*aNormalBlock, "unexpected null block");
AssertInitialState();
DoExpand(aNormalBlock, PR_FALSE);
if (*aImportantBlock) {
DoExpand(aImportantBlock, PR_TRUE);
}
}
nsCSSExpandedDataBlock::ComputeSizeResult
nsCSSExpandedDataBlock::ComputeSize()
{
ComputeSizeResult result = {0, 0};
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
continue;
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
continue;
nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
#ifdef DEBUG
void *prop = PropertyAt(iProp);
#endif
PRUint32 increment = 0;
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
#ifdef DEBUG
nsCSSValue* val = static_cast<nsCSSValue*>(prop);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null,
"null value while computing size");
#endif
increment = CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
#ifdef DEBUG
nsCSSRect* val = static_cast<nsCSSRect*>(prop);
NS_ASSERTION(val->HasValue(),
"Valueless rect while computing size");
#endif
increment = CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
#ifdef DEBUG
nsCSSValuePair* val = static_cast<nsCSSValuePair*>(prop);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null,
"Valueless pair while computing size");
#endif
increment = CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
#ifdef DEBUG
void* val = *static_cast<void**>(prop);
NS_ASSERTION(val, "Null pointer while computing size");
#endif
increment = CDBPointerStorage_advance;
} break;
}
if (mPropertiesImportant.HasPropertyAt(iHigh, iLow))
result.important += increment;
else
result.normal += increment;
}
}
return result;
}
void
nsCSSExpandedDataBlock::Compress(nsCSSCompressedDataBlock **aNormalBlock,
nsCSSCompressedDataBlock **aImportantBlock)
{
nsRefPtr<nsCSSCompressedDataBlock> result_normal, result_important;
char *cursor_normal, *cursor_important;
ComputeSizeResult size = ComputeSize();
result_normal = new(size.normal) nsCSSCompressedDataBlock();
if (!result_normal) {
*aNormalBlock = nsnull;
*aImportantBlock = nsnull;
return;
}
cursor_normal = result_normal->Block();
if (size.important != 0) {
result_important = new(size.important) nsCSSCompressedDataBlock();
if (!result_important) {
*aNormalBlock = nsnull;
*aImportantBlock = nsnull;
return;
}
cursor_important = result_important->Block();
} else {
result_important = nsnull;
}
/*
* Save needless copying and allocation by copying the memory
* corresponding to the stored data in the expanded block, and then
* clearing the data in the expanded block.
*/
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
continue;
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
continue;
nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
NS_ASSERTION(0 <= iProp && iProp < eCSSProperty_COUNT_no_shorthands,
"out of range");
void *prop = PropertyAt(iProp);
PRBool important =
mPropertiesImportant.HasPropertyAt(iHigh, iLow);
char *&cursor = important ? cursor_important : cursor_normal;
nsCSSCompressedDataBlock *result =
important ? result_important : result_normal;
switch (nsCSSProps::kTypeTable[iProp]) {
case eCSSType_Value: {
nsCSSValue* val = static_cast<nsCSSValue*>(prop);
NS_ASSERTION(val->GetUnit() != eCSSUnit_Null,
"Null value while compressing");
CDBValueStorage *storage =
reinterpret_cast<CDBValueStorage*>(cursor);
storage->property = iProp;
memcpy(&storage->value, val, sizeof(nsCSSValue));
new (val) nsCSSValue();
cursor += CDBValueStorage_advance;
} break;
case eCSSType_Rect: {
nsCSSRect* val = static_cast<nsCSSRect*>(prop);
NS_ASSERTION(val->HasValue(),
"Valueless rect while compressing");
CDBRectStorage *storage =
reinterpret_cast<CDBRectStorage*>(cursor);
storage->property = iProp;
memcpy(&storage->value, val, sizeof(nsCSSRect));
new (val) nsCSSRect();
cursor += CDBRectStorage_advance;
} break;
case eCSSType_ValuePair: {
nsCSSValuePair* val = static_cast<nsCSSValuePair*>(prop);
NS_ASSERTION(val->mXValue.GetUnit() != eCSSUnit_Null ||
val->mYValue.GetUnit() != eCSSUnit_Null,
"Valueless pair while compressing");
CDBValuePairStorage *storage =
reinterpret_cast<CDBValuePairStorage*>(cursor);
storage->property = iProp;
memcpy(&storage->value, val, sizeof(nsCSSValuePair));
new (val) nsCSSValuePair();
cursor += CDBValuePairStorage_advance;
} break;
case eCSSType_ValueList:
case eCSSType_ValuePairList: {
void*& val = *static_cast<void**>(prop);
NS_ASSERTION(val, "Null pointer while compressing");
CDBPointerStorage *storage =
reinterpret_cast<CDBPointerStorage*>(cursor);
storage->property = iProp;
storage->value = val;
val = nsnull;
cursor += CDBPointerStorage_advance;
} break;
}
result->mStyleBits |=
nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]);
}
}
result_normal->mBlockEnd = cursor_normal;
NS_ASSERTION(result_normal->DataSize() == ptrdiff_t(size.normal),
"size miscalculation");
if (result_important) {
result_important->mBlockEnd = cursor_important;
NS_ASSERTION(result_important->DataSize() == ptrdiff_t(size.important),
"size miscalculation");
}
ClearSets();
AssertInitialState();
result_normal.forget(aNormalBlock);
result_important.forget(aImportantBlock);
}
void
nsCSSExpandedDataBlock::Clear()
{
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
continue;
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
continue;
nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
ClearProperty(iProp);
}
}
AssertInitialState();
}
void
nsCSSExpandedDataBlock::ClearProperty(nsCSSProperty aPropID)
{
NS_ASSERTION(0 <= aPropID && aPropID < eCSSProperty_COUNT_no_shorthands,
"out of range");
ClearPropertyBit(aPropID);
ClearImportantBit(aPropID);
void *prop = PropertyAt(aPropID);
switch (nsCSSProps::kTypeTable[aPropID]) {
case eCSSType_Value: {
nsCSSValue* val = static_cast<nsCSSValue*>(prop);
val->Reset();
} break;
case eCSSType_Rect: {
nsCSSRect* val = static_cast<nsCSSRect*>(prop);
val->Reset();
} break;
case eCSSType_ValuePair: {
nsCSSValuePair* val = static_cast<nsCSSValuePair*>(prop);
val->mXValue.Reset();
val->mYValue.Reset();
} break;
case eCSSType_ValueList: {
nsCSSValueList*& val = *static_cast<nsCSSValueList**>(prop);
if (val) {
delete val;
val = nsnull;
}
} break;
case eCSSType_ValuePairList: {
nsCSSValuePairList*& val =
*static_cast<nsCSSValuePairList**>(prop);
if (val) {
delete val;
val = nsnull;
}
} break;
}
}
#ifdef DEBUG
void
nsCSSExpandedDataBlock::DoAssertInitialState()
{
mPropertiesSet.AssertIsEmpty("not initial state");
mPropertiesImportant.AssertIsEmpty("not initial state");
for (PRUint32 i = 0; i < eCSSProperty_COUNT_no_shorthands; ++i) {
void *prop = PropertyAt(nsCSSProperty(i));
switch (nsCSSProps::kTypeTable[i]) {
case eCSSType_Value: {
nsCSSValue* val = static_cast<nsCSSValue*>(prop);
NS_ASSERTION(val->GetUnit() == eCSSUnit_Null,
"not initial state");
} break;
case eCSSType_Rect: {
nsCSSRect* val = static_cast<nsCSSRect*>(prop);
NS_ASSERTION(val->mTop.GetUnit() == eCSSUnit_Null,
"not initial state");
NS_ASSERTION(val->mRight.GetUnit() == eCSSUnit_Null,
"not initial state");
NS_ASSERTION(val->mBottom.GetUnit() == eCSSUnit_Null,
"not initial state");
NS_ASSERTION(val->mLeft.GetUnit() == eCSSUnit_Null,
"not initial state");
} break;
case eCSSType_ValuePair: {
nsCSSValuePair* val = static_cast<nsCSSValuePair*>(prop);
NS_ASSERTION(val->mXValue.GetUnit() == eCSSUnit_Null,
"not initial state");
NS_ASSERTION(val->mYValue.GetUnit() == eCSSUnit_Null,
"not initial state");
} break;
case eCSSType_ValueList: {
nsCSSValueList* val = *static_cast<nsCSSValueList**>(prop);
NS_ASSERTION(val == nsnull, "not initial state");
} break;
case eCSSType_ValuePairList: {
nsCSSValuePairList* val =
*static_cast<nsCSSValuePairList**>(prop);
NS_ASSERTION(val == nsnull, "not initial state");
} break;
}
}
}
#endif
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