gecko-dev/layout/svg/nsSVGTextContainerFrame.cpp

485 строки
13 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Main header first:
#include "nsSVGContainerFrame.h"
#include <algorithm>
// Keep others in (case-insensitive) order:
#include "nsError.h"
#include "nsSVGGlyphFrame.h"
#include "nsSVGTextFrame.h"
#include "nsSVGUtils.h"
#include "SVGAnimatedNumberList.h"
#include "SVGLengthList.h"
#include "SVGNumberList.h"
using namespace mozilla;
//----------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(nsSVGTextContainerFrame)
NS_QUERYFRAME_ENTRY(nsSVGTextContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGDisplayContainerFrame)
NS_IMPL_FRAMEARENA_HELPERS(nsSVGTextContainerFrame)
void
nsSVGTextContainerFrame::NotifyGlyphMetricsChange()
{
nsSVGTextFrame *textFrame = GetTextFrame();
if (textFrame)
textFrame->NotifyGlyphMetricsChange();
}
void
nsSVGTextContainerFrame::GetXY(SVGUserUnitList *aX, SVGUserUnitList *aY)
{
static_cast<nsSVGElement*>(mContent)->
GetAnimatedLengthListValues(aX, aY, nullptr);
}
void
nsSVGTextContainerFrame::GetDxDy(SVGUserUnitList *aDx, SVGUserUnitList *aDy)
{
// SVGUserUnitList is lazy, so there's little overhead it getting the x
// and y lists even though we ignore them.
SVGUserUnitList xLengthList, yLengthList;
static_cast<nsSVGElement*>(mContent)->
GetAnimatedLengthListValues(&xLengthList, &yLengthList, aDx, aDy, nullptr);
}
const SVGNumberList*
nsSVGTextContainerFrame::GetRotate()
{
SVGAnimatedNumberList *animList =
static_cast<nsSVGElement*>(mContent)->
GetAnimatedNumberList(nsGkAtoms::rotate);
return animList ? &animList->GetAnimValue() : nullptr;
}
//----------------------------------------------------------------------
// nsIFrame methods
NS_IMETHODIMP
nsSVGTextContainerFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
nsresult rv = nsSVGDisplayContainerFrame::InsertFrames(aListID,
aPrevFrame,
aFrameList);
NotifyGlyphMetricsChange();
return rv;
}
NS_IMETHODIMP
nsSVGTextContainerFrame::RemoveFrame(ChildListID aListID, nsIFrame *aOldFrame)
{
nsSVGTextFrame *textFrame = GetTextFrame();
nsresult rv = nsSVGDisplayContainerFrame::RemoveFrame(aListID, aOldFrame);
if (textFrame)
textFrame->NotifyGlyphMetricsChange();
return rv;
}
NS_IMETHODIMP
nsSVGTextContainerFrame::GetStartPositionOfChar(uint32_t charnum, nsISupports **_retval)
{
*_retval = nullptr;
if (charnum >= GetNumberOfChars()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
if (!node) {
return NS_ERROR_FAILURE;
}
uint32_t offset;
nsSVGGlyphFrame *frame = GetGlyphFrameAtCharNum(node, charnum, &offset);
if (!frame) {
return NS_ERROR_FAILURE;
}
return frame->GetStartPositionOfChar(charnum - offset, _retval);
}
NS_IMETHODIMP
nsSVGTextContainerFrame::GetEndPositionOfChar(uint32_t charnum, nsISupports **_retval)
{
*_retval = nullptr;
if (charnum >= GetNumberOfChars()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
if (!node) {
return NS_ERROR_FAILURE;
}
uint32_t offset;
nsSVGGlyphFrame *frame = GetGlyphFrameAtCharNum(node, charnum, &offset);
if (!frame) {
return NS_ERROR_FAILURE;
}
return frame->GetEndPositionOfChar(charnum - offset, _retval);
}
NS_IMETHODIMP
nsSVGTextContainerFrame::GetExtentOfChar(uint32_t charnum, dom::SVGIRect **_retval)
{
*_retval = nullptr;
if (charnum >= GetNumberOfChars()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
if (!node) {
return NS_ERROR_FAILURE;
}
uint32_t offset;
nsSVGGlyphFrame *frame = GetGlyphFrameAtCharNum(node, charnum, &offset);
if (!frame) {
return NS_ERROR_FAILURE;
}
return frame->GetExtentOfChar(charnum - offset, _retval);
}
NS_IMETHODIMP
nsSVGTextContainerFrame::GetRotationOfChar(uint32_t charnum, float *_retval)
{
*_retval = 0.0f;
if (charnum >= GetNumberOfChars()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
if (!node) {
return NS_ERROR_FAILURE;
}
uint32_t offset;
nsSVGGlyphFrame *frame = GetGlyphFrameAtCharNum(node, charnum, &offset);
if (!frame) {
return NS_ERROR_FAILURE;
}
return frame->GetRotationOfChar(charnum - offset, _retval);
}
uint32_t
nsSVGTextContainerFrame::GetNumberOfChars()
{
uint32_t nchars = 0;
nsISVGGlyphFragmentNode* node = GetFirstGlyphFragmentChildNode();
while (node) {
nchars += node->GetNumberOfChars();
node = GetNextGlyphFragmentChildNode(node);
}
return nchars;
}
float
nsSVGTextContainerFrame::GetComputedTextLength()
{
float length = 0.0f;
nsISVGGlyphFragmentNode* node = GetFirstGlyphFragmentChildNode();
while (node) {
length += node->GetComputedTextLength();
node = GetNextGlyphFragmentChildNode(node);
}
return length;
}
float
nsSVGTextContainerFrame::GetSubStringLength(uint32_t charnum, uint32_t nchars)
{
float length = 0.0f;
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
while (node) {
uint32_t count = node->GetNumberOfChars();
if (count > charnum) {
uint32_t fragmentChars = std::min(nchars, count - charnum);
float fragmentLength = node->GetSubStringLength(charnum, fragmentChars);
length += fragmentLength;
nchars -= fragmentChars;
if (nchars == 0) break;
}
charnum -= std::min(charnum, count);
node = GetNextGlyphFragmentChildNode(node);
}
return length;
}
int32_t
nsSVGTextContainerFrame::GetCharNumAtPosition(nsISVGPoint *point)
{
int32_t index = -1;
int32_t offset = 0;
nsISVGGlyphFragmentNode *node = GetFirstGlyphFragmentChildNode();
while (node) {
uint32_t count = node->GetNumberOfChars();
if (count > 0) {
int32_t charnum = node->GetCharNumAtPosition(point);
if (charnum >= 0) {
index = charnum + offset;
}
offset += count;
// Keep going, multiple characters may match
// and we must return the last one
}
node = GetNextGlyphFragmentChildNode(node);
}
return index;
}
// -------------------------------------------------------------------------
// Protected functions
// -------------------------------------------------------------------------
nsISVGGlyphFragmentNode *
nsSVGTextContainerFrame::GetFirstGlyphFragmentChildNode()
{
nsISVGGlyphFragmentNode *retval = nullptr;
nsIFrame* kid = mFrames.FirstChild();
while (kid) {
retval = do_QueryFrame(kid);
if (retval) break;
kid = kid->GetNextSibling();
}
return retval;
}
nsISVGGlyphFragmentNode *
nsSVGTextContainerFrame::GetNextGlyphFragmentChildNode(nsISVGGlyphFragmentNode *node)
{
nsISVGGlyphFragmentNode *retval = nullptr;
nsIFrame *frame = do_QueryFrame(node);
NS_ASSERTION(frame, "interface not implemented");
frame = frame->GetNextSibling();
while (frame) {
retval = do_QueryFrame(frame);
if (retval) break;
frame = frame->GetNextSibling();
}
return retval;
}
// -------------------------------------------------------------------------
// Private functions
// -------------------------------------------------------------------------
nsSVGGlyphFrame *
nsSVGTextContainerFrame::GetGlyphFrameAtCharNum(nsISVGGlyphFragmentNode* node,
uint32_t charnum,
uint32_t *offset)
{
nsSVGGlyphFrame *frame = node->GetFirstGlyphFrame();
*offset = 0;
while (frame) {
uint32_t count = frame->GetNumberOfChars();
if (count > charnum)
return frame;
charnum -= count;
*offset += count;
frame = frame->GetNextGlyphFrame();
}
// not found
return nullptr;
}
nsSVGTextFrame *
nsSVGTextContainerFrame::GetTextFrame()
{
for (nsIFrame *frame = this; frame != nullptr; frame = frame->GetParent()) {
if (frame->GetType() == nsGkAtoms::svgTextFrame) {
return static_cast<nsSVGTextFrame*>(frame);
}
}
return nullptr;
}
void
nsSVGTextContainerFrame::CopyPositionList(nsTArray<float> *parentList,
SVGUserUnitList *selfList,
nsTArray<float> &dstList,
uint32_t aOffset)
{
dstList.Clear();
uint32_t strLength = GetNumberOfChars();
uint32_t parentCount = 0;
if (parentList && parentList->Length() > aOffset) {
parentCount = std::min(parentList->Length() - aOffset, strLength);
}
uint32_t selfCount = std::min(selfList->Length(), strLength);
uint32_t count = std::max(parentCount, selfCount);
if (!dstList.SetLength(count))
return;
for (uint32_t i = 0; i < selfCount; i++) {
dstList[i] = (*selfList)[i];
}
for (uint32_t i = selfCount; i < parentCount; i++) {
dstList[i] = (*parentList)[aOffset + i];
}
}
void
nsSVGTextContainerFrame::CopyRotateList(nsTArray<float> *parentList,
const SVGNumberList *selfList,
nsTArray<float> &dstList,
uint32_t aOffset)
{
dstList.Clear();
uint32_t strLength = GetNumberOfChars();
uint32_t parentCount = 0;
if (parentList && parentList->Length() > aOffset) {
parentCount = std::min(parentList->Length() - aOffset, strLength);
}
uint32_t selfCount = std::min(selfList ? selfList->Length() : 0, strLength);
uint32_t count = std::max(parentCount, selfCount);
if (count > 0) {
if (!dstList.SetLength(count))
return;
for (uint32_t i = 0; i < selfCount; i++) {
dstList[i] = (*selfList)[i];
}
for (uint32_t i = selfCount; i < parentCount; i++) {
dstList[i] = (*parentList)[aOffset + i];
}
} else if (parentList && !parentList->IsEmpty()) {
// rotate is applied to extra characters too
dstList.AppendElement((*parentList)[parentList->Length() - 1]);
}
}
uint32_t
nsSVGTextContainerFrame::BuildPositionList(uint32_t aOffset,
uint32_t aDepth)
{
nsSVGTextContainerFrame *parent = do_QueryFrame(mParent);
nsTArray<float> *parentX = nullptr, *parentY = nullptr;
nsTArray<float> *parentDx = nullptr, *parentDy = nullptr;
nsTArray<float> *parentRotate = nullptr;
if (parent) {
parentX = &(parent->mX);
parentY = &(parent->mY);
parentDx = &(parent->mDx);
parentDy = &(parent->mDy);
parentRotate = &(parent->mRotate);
}
SVGUserUnitList x, y;
GetXY(&x, &y);
CopyPositionList(parentX, &x, mX, aOffset);
CopyPositionList(parentY, &y, mY, aOffset);
SVGUserUnitList dx, dy;
GetDxDy(&dx, &dy);
CopyPositionList(parentDx, &dx, mDx, aOffset);
CopyPositionList(parentDy, &dy, mDy, aOffset);
const SVGNumberList *rotate = GetRotate();
CopyRotateList(parentRotate, rotate, mRotate, aOffset);
uint32_t startIndex = 0;
nsIFrame* kid = mFrames.FirstChild();
while (kid) {
nsSVGTextContainerFrame *text = do_QueryFrame(kid);
if (text) {
startIndex += text->BuildPositionList(startIndex, aDepth + 1);
} else if (kid->GetType() == nsGkAtoms::svgGlyphFrame) {
nsSVGGlyphFrame *leaf = static_cast<nsSVGGlyphFrame*>(kid);
leaf->SetStartIndex(startIndex);
startIndex += leaf->GetNumberOfChars();
}
kid = kid->GetNextSibling();
}
return startIndex;
}
void
nsSVGTextContainerFrame::GetEffectiveXY(nsTArray<float> &aX,
nsTArray<float> &aY)
{
aX.AppendElements(mX);
aY.AppendElements(mY);
}
void
nsSVGTextContainerFrame::GetEffectiveDxDy(nsTArray<float> &aDx,
nsTArray<float> &aDy)
{
aDx.AppendElements(mDx);
aDy.AppendElements(mDy);
}
void
nsSVGTextContainerFrame::GetEffectiveRotate(nsTArray<float> &aRotate)
{
aRotate.AppendElements(mRotate);
}
void
nsSVGTextContainerFrame::SetWhitespaceCompression()
{
bool compressWhitespace = true;
for (const nsIFrame *frame = this; frame != nullptr; frame = frame->GetParent()) {
static const nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::preserve, &nsGkAtoms::_default, nullptr};
int32_t index = frame->GetContent()->FindAttrValueIn(
kNameSpaceID_XML,
nsGkAtoms::space,
strings, eCaseMatters);
if (index == 0) {
compressWhitespace = false;
break;
}
if (index != nsIContent::ATTR_MISSING ||
(frame->GetStateBits() & NS_STATE_IS_OUTER_SVG))
break;
}
nsISVGGlyphFragmentNode* node = GetFirstGlyphFragmentChildNode();
while (node) {
node->SetWhitespaceCompression(compressWhitespace);
node = GetNextGlyphFragmentChildNode(node);
}
}