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gecko/gfx/thebes/gfxUniscribeShaper.cpp

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/* -*- Mode: C++; tab-width: 20; 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 Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2005-2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <stuart@mozilla.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* Mats Palmgren <mats.palmgren@bredband.net>
* John Daggett <jdaggett@mozilla.com>
* Jonathan Kew <jfkthame@gmail.com>
*
* 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 ***** */
//#define FORCE_PR_LOG
#include "prtypes.h"
#include "gfxTypes.h"
#include "gfxContext.h"
#include "gfxUniscribeShaper.h"
#include "gfxWindowsPlatform.h"
#include "gfxAtoms.h"
#include "gfxFontTest.h"
#include "cairo.h"
#include "cairo-win32.h"
#include <windows.h>
#include "nsTArray.h"
#include "prlog.h"
#include "prinit.h"
static PRLogModuleInfo *gFontLog = PR_NewLogModule("winfonts");
/**********************************************************************
*
* class gfxUniscribeShaper
*
**********************************************************************/
#define ESTIMATE_MAX_GLYPHS(L) (((3 * (L)) >> 1) + 16)
class UniscribeItem
{
public:
UniscribeItem(gfxContext *aContext, HDC aDC,
gfxUniscribeShaper *aShaper,
const PRUnichar *aString, PRUint32 aLength,
SCRIPT_ITEM *aItem, PRUint32 aIVS) :
mContext(aContext), mDC(aDC),
mShaper(aShaper),
mItemString(aString), mItemLength(aLength),
mAlternativeString(nsnull), mScriptItem(aItem),
mScript(aItem->a.eScript),
mNumGlyphs(0), mMaxGlyphs(ESTIMATE_MAX_GLYPHS(aLength)),
mFontSelected(PR_FALSE), mIVS(aIVS)
{
NS_ASSERTION(mMaxGlyphs < 65535, "UniscribeItem is too big, ScriptShape() will fail!");
}
~UniscribeItem() {
free(mAlternativeString);
}
PRBool AllocateBuffers() {
return (mGlyphs.SetLength(mMaxGlyphs) &&
mClusters.SetLength(mItemLength + 1) &&
mAttr.SetLength(mMaxGlyphs));
}
/* possible return values:
* S_OK - things succeeded
* GDI_ERROR - things failed to shape. Might want to try again after calling DisableShaping()
*/
HRESULT Shape() {
HRESULT rv;
HDC shapeDC = nsnull;
const PRUnichar *str = mAlternativeString ? mAlternativeString : mItemString;
mScriptItem->a.fLogicalOrder = PR_TRUE;
SCRIPT_ANALYSIS sa = mScriptItem->a;
while (PR_TRUE) {
rv = ScriptShape(shapeDC, mShaper->ScriptCache(),
str, mItemLength,
mMaxGlyphs, &sa,
mGlyphs.Elements(), mClusters.Elements(),
mAttr.Elements(), &mNumGlyphs);
if (rv == E_OUTOFMEMORY) {
mMaxGlyphs *= 2;
if (!mGlyphs.SetLength(mMaxGlyphs) ||
!mAttr.SetLength(mMaxGlyphs)) {
return E_OUTOFMEMORY;
}
continue;
}
// Uniscribe can't do shaping with some fonts, so it sets the
// fNoGlyphIndex flag in the SCRIPT_ANALYSIS structure to indicate
// this. This occurs with CFF fonts loaded with
// AddFontMemResourceEx but it's not clear what the other cases
// are. We return an error so our caller can try fallback shaping.
// see http://msdn.microsoft.com/en-us/library/ms776520(VS.85).aspx
if (sa.fNoGlyphIndex) {
return GDI_ERROR;
}
if (rv == E_PENDING) {
if (shapeDC == mDC) {
// we already tried this once, something failed, give up
return E_PENDING;
}
SelectFont();
shapeDC = mDC;
continue;
}
// http://msdn.microsoft.com/en-us/library/dd368564(VS.85).aspx:
// Uniscribe will return this if "the font corresponding to the
// DC does not support the script required by the run...".
// In this case, we'll set the script code to SCRIPT_UNDEFINED
// and try again, so that we'll at least get glyphs even though
// they won't necessarily have proper shaping.
// (We probably shouldn't have selected this font at all,
// but it's too late to fix that here.)
if (rv == USP_E_SCRIPT_NOT_IN_FONT) {
sa.eScript = SCRIPT_UNDEFINED;
NS_WARNING("Uniscribe says font does not support script needed");
continue;
}
// Prior to Windows 7, Uniscribe didn't support Ideographic Variation
// Selectors. Replace the UVS glyph manually.
if (mIVS) {
PRUint32 lastChar = str[mItemLength - 1];
if (NS_IS_LOW_SURROGATE(lastChar)
&& NS_IS_HIGH_SURROGATE(str[mItemLength - 2])) {
lastChar = SURROGATE_TO_UCS4(str[mItemLength - 2], lastChar);
}
PRUint16 glyphId = mShaper->GetFont()->GetUVSGlyph(lastChar, mIVS);
if (glyphId) {
mGlyphs[mNumGlyphs - 1] = glyphId;
}
}
return rv;
}
}
PRBool ShapingEnabled() {
return (mScriptItem->a.eScript != SCRIPT_UNDEFINED);
}
void DisableShaping() {
mScriptItem->a.eScript = SCRIPT_UNDEFINED;
// Note: If we disable the shaping by using SCRIPT_UNDEFINED and
// the string has the surrogate pair, ScriptShape API is
// *sometimes* crashed. Therefore, we should replace the surrogate
// pair to U+FFFD. See bug 341500.
GenerateAlternativeString();
}
void EnableShaping() {
mScriptItem->a.eScript = mScript;
if (mAlternativeString) {
free(mAlternativeString);
mAlternativeString = nsnull;
}
}
PRBool IsGlyphMissing(SCRIPT_FONTPROPERTIES *aSFP, PRUint32 aGlyphIndex) {
return (mGlyphs[aGlyphIndex] == aSFP->wgDefault);
}
HRESULT Place() {
HRESULT rv;
HDC placeDC = nsnull;
if (!mOffsets.SetLength(mNumGlyphs) ||
!mAdvances.SetLength(mNumGlyphs)) {
return E_OUTOFMEMORY;
}
SCRIPT_ANALYSIS sa = mScriptItem->a;
while (PR_TRUE) {
rv = ScriptPlace(placeDC, mShaper->ScriptCache(),
mGlyphs.Elements(), mNumGlyphs,
mAttr.Elements(), &sa,
mAdvances.Elements(), mOffsets.Elements(), NULL);
if (rv == E_PENDING) {
SelectFont();
placeDC = mDC;
continue;
}
if (rv == USP_E_SCRIPT_NOT_IN_FONT) {
sa.eScript = SCRIPT_UNDEFINED;
continue;
}
break;
}
return rv;
}
void ScriptFontProperties(SCRIPT_FONTPROPERTIES *sfp) {
HRESULT rv;
memset(sfp, 0, sizeof(SCRIPT_FONTPROPERTIES));
sfp->cBytes = sizeof(SCRIPT_FONTPROPERTIES);
rv = ScriptGetFontProperties(NULL, mShaper->ScriptCache(),
sfp);
if (rv == E_PENDING) {
SelectFont();
rv = ScriptGetFontProperties(mDC, mShaper->ScriptCache(),
sfp);
}
}
void SaveGlyphs(gfxTextRun *aRun, PRUint32 aRunStart) {
PRUint32 offsetInRun = aRunStart + mScriptItem->iCharPos;
// XXX We should store this in the item and only fetch it once
SCRIPT_FONTPROPERTIES sfp;
ScriptFontProperties(&sfp);
PRUint32 offset = 0;
nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
gfxTextRun::CompressedGlyph g;
const PRUint32 appUnitsPerDevUnit = aRun->GetAppUnitsPerDevUnit();
while (offset < mItemLength) {
PRUint32 runOffset = offsetInRun + offset;
if (offset > 0 && mClusters[offset] == mClusters[offset - 1]) {
g.SetComplex(aRun->IsClusterStart(runOffset), PR_FALSE, 0);
aRun->SetGlyphs(runOffset, g, nsnull);
} else {
// Count glyphs for this character
PRUint32 k = mClusters[offset];
PRUint32 glyphCount = mNumGlyphs - k;
PRUint32 nextClusterOffset;
PRBool missing = IsGlyphMissing(&sfp, k);
for (nextClusterOffset = offset + 1; nextClusterOffset < mItemLength; ++nextClusterOffset) {
if (mClusters[nextClusterOffset] > k) {
glyphCount = mClusters[nextClusterOffset] - k;
break;
}
}
PRUint32 j;
for (j = 1; j < glyphCount; ++j) {
if (IsGlyphMissing(&sfp, k + j)) {
missing = PR_TRUE;
}
}
PRInt32 advance = mAdvances[k]*appUnitsPerDevUnit;
WORD glyph = mGlyphs[k];
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(mItemString[offset]),
"invalid character detected");
if (missing) {
if (NS_IS_HIGH_SURROGATE(mItemString[offset]) &&
offset + 1 < mItemLength &&
NS_IS_LOW_SURROGATE(mItemString[offset + 1])) {
aRun->SetMissingGlyph(runOffset,
SURROGATE_TO_UCS4(mItemString[offset],
mItemString[offset + 1]));
} else {
aRun->SetMissingGlyph(runOffset, mItemString[offset]);
}
} else if (glyphCount == 1 && advance >= 0 &&
mOffsets[k].dv == 0 && mOffsets[k].du == 0 &&
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(glyph)) {
aRun->SetSimpleGlyph(runOffset, g.SetSimpleGlyph(advance, glyph));
} else {
if (detailedGlyphs.Length() < glyphCount) {
if (!detailedGlyphs.AppendElements(glyphCount - detailedGlyphs.Length()))
return;
}
PRUint32 i;
for (i = 0; i < glyphCount; ++i) {
gfxTextRun::DetailedGlyph *details = &detailedGlyphs[i];
details->mGlyphID = mGlyphs[k + i];
details->mAdvance = mAdvances[k + i]*appUnitsPerDevUnit;
details->mXOffset = float(mOffsets[k + i].du)*appUnitsPerDevUnit*aRun->GetDirection();
details->mYOffset = - float(mOffsets[k + i].dv)*appUnitsPerDevUnit;
}
aRun->SetGlyphs(runOffset,
g.SetComplex(PR_TRUE, PR_TRUE, glyphCount), detailedGlyphs.Elements());
}
}
++offset;
}
}
void SelectFont() {
if (mFontSelected)
return;
cairo_t *cr = mContext->GetCairo();
cairo_set_font_face(cr, mShaper->GetFont()->CairoFontFace());
cairo_set_font_size(cr, mShaper->GetFont()->GetAdjustedSize());
cairo_scaled_font_t *scaledFont = mShaper->GetFont()->CairoScaledFont();
cairo_win32_scaled_font_select_font(scaledFont, mDC);
mFontSelected = PR_TRUE;
}
private:
void GenerateAlternativeString() {
if (mAlternativeString)
free(mAlternativeString);
mAlternativeString = (PRUnichar *)malloc(mItemLength * sizeof(PRUnichar));
if (!mAlternativeString)
return;
memcpy((void *)mAlternativeString, (const void *)mItemString,
mItemLength * sizeof(PRUnichar));
for (PRUint32 i = 0; i < mItemLength; i++) {
if (NS_IS_HIGH_SURROGATE(mItemString[i]) || NS_IS_LOW_SURROGATE(mItemString[i]))
mAlternativeString[i] = PRUnichar(0xFFFD);
}
}
private:
nsRefPtr<gfxContext> mContext;
HDC mDC;
gfxUniscribeShaper *mShaper;
SCRIPT_ITEM *mScriptItem;
WORD mScript;
public:
// these point to the full string/length of the item
const PRUnichar *mItemString;
const PRUint32 mItemLength;
private:
PRUnichar *mAlternativeString;
#define AVERAGE_ITEM_LENGTH 40
nsAutoTArray<WORD, PRUint32(ESTIMATE_MAX_GLYPHS(AVERAGE_ITEM_LENGTH))> mGlyphs;
nsAutoTArray<WORD, AVERAGE_ITEM_LENGTH + 1> mClusters;
nsAutoTArray<SCRIPT_VISATTR, PRUint32(ESTIMATE_MAX_GLYPHS(AVERAGE_ITEM_LENGTH))> mAttr;
nsAutoTArray<GOFFSET, 2 * AVERAGE_ITEM_LENGTH> mOffsets;
nsAutoTArray<int, 2 * AVERAGE_ITEM_LENGTH> mAdvances;
#undef AVERAGE_ITEM_LENGTH
int mMaxGlyphs;
int mNumGlyphs;
PRUint32 mIVS;
PRPackedBool mFontSelected;
};
#define MAX_ITEM_LENGTH 16384
class Uniscribe
{
public:
Uniscribe(const PRUnichar *aString,
PRUint32 aLength,
gfxTextRun *aTextRun):
mString(aString), mLength(aLength), mTextRun(aTextRun)
{
}
~Uniscribe() {
}
void Init() {
memset(&mControl, 0, sizeof(SCRIPT_CONTROL));
memset(&mState, 0, sizeof(SCRIPT_STATE));
// Lock the direction. Don't allow the itemizer to change directions
// based on character type.
mState.uBidiLevel = mTextRun->IsRightToLeft() ? 1 : 0;
mState.fOverrideDirection = PR_TRUE;
}
private:
// We try to avoid calling Uniscribe with text runs that may generate
// more than this many glyphs, because of the possibility of arithmetic
// overflow of 16-bit variables. If long runs need to be split because
// of this, we'll look for whitespace to break on so that shaping needed
// (e.g. for complex scripts) should be unaffected.
#define MAX_UNISCRIBE_GLYPHS 32767
// Append mItems[aIndex] to aDest, adding extra items to aDest to ensure
// that no item is too long for ScriptShape() to handle. See bug 366643.
nsresult CopyItemSplitOversize(int aIndex, nsTArray<SCRIPT_ITEM> &aDest) {
aDest.AppendElement(mItems[aIndex]);
const int itemLength =
mItems[aIndex+1].iCharPos - mItems[aIndex].iCharPos;
if (ESTIMATE_MAX_GLYPHS(itemLength) > MAX_UNISCRIBE_GLYPHS) {
// This item's length would cause ScriptShape() to fail.
// We need to add extra items here so that no item's length
// could cause the fail.
// We break on whitespace or cluster boundaries if possible.
const int nextItemStart = mItems[aIndex+1].iCharPos;
int start = FindNextItemStart(mItems[aIndex].iCharPos,
nextItemStart);
while (start < nextItemStart) {
SCRIPT_ITEM item = mItems[aIndex];
item.iCharPos = start;
aDest.AppendElement(item);
start = FindNextItemStart(start, nextItemStart);
}
}
return NS_OK;
}
PRUint32 FindNextItemStart(int aOffset, int aLimit) {
if (aOffset + MAX_ITEM_LENGTH >= aLimit) {
// The item starting at aOffset can't be longer than max length,
// so starting the next item at aLimit won't cause ScriptShape()
// to fail.
return aLimit;
}
// Try to start the next item before or after a space, since spaces
// don't kern or ligate.
PRInt32 off;
int boundary = -1;
for (off = MAX_ITEM_LENGTH; off > 1; --off) {
if (mTextRun->IsClusterStart(off)) {
if (off > boundary) {
boundary = off;
}
if (mString[aOffset+off] == ' ' ||
mString[aOffset+off - 1] == ' ') {
return aOffset+off;
}
}
}
// Try to start the next item at last cluster boundary in the range.
if (boundary > 0) {
return aOffset+boundary;
}
// No nice cluster boundaries inside MAX_ITEM_LENGTH characters, break
// on the size limit. It won't be visually pleasing, but at least it
// won't cause ScriptShape() to fail.
return aOffset + MAX_ITEM_LENGTH;
}
public:
int Itemize() {
HRESULT rv;
int maxItems = 5;
Init();
// Allocate space for one more item than expected, to handle a rare
// overflow in ScriptItemize (pre XP SP2). See bug 366643.
if (!mItems.SetLength(maxItems + 1)) {
return 0;
}
while ((rv = ScriptItemize(mString, mLength, maxItems, &mControl, &mState,
mItems.Elements(), &mNumItems)) == E_OUTOFMEMORY) {
maxItems *= 2;
if (!mItems.SetLength(maxItems + 1)) {
return 0;
}
Init();
}
if (ESTIMATE_MAX_GLYPHS(mLength) > 65535) {
// Any item of length > 43680 will cause ScriptShape() to fail, as its
// mMaxGlyphs value will be greater than 65535 (43680*1.5+16>65535). So we
// need to break up items which are longer than that upon cluster boundaries.
// See bug 394751 for details.
nsTArray<SCRIPT_ITEM> items;
for (int i=0; i<mNumItems; i++) {
nsresult nrs = CopyItemSplitOversize(i, items);
NS_ASSERTION(NS_SUCCEEDED(nrs), "CopyItemSplitOversize() failed");
}
items.AppendElement(mItems[mNumItems]); // copy terminator.
mItems = items;
mNumItems = items.Length() - 1; // Don't count the terminator.
}
return mNumItems;
}
PRUint32 ItemsLength() {
return mNumItems;
}
SCRIPT_ITEM *ScriptItem(PRUint32 i) {
NS_ASSERTION(i <= (PRUint32)mNumItems, "Trying to get out of bounds item");
return &mItems[i];
}
private:
const PRUnichar *mString;
const PRUint32 mLength;
gfxTextRun *mTextRun;
SCRIPT_CONTROL mControl;
SCRIPT_STATE mState;
nsTArray<SCRIPT_ITEM> mItems;
int mNumItems;
};
PRBool
gfxUniscribeShaper::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript)
{
DCFromContext aDC(aContext);
PRBool result = PR_TRUE;
HRESULT rv;
gfxGDIFont *font = static_cast<gfxGDIFont*>(mFont);
AutoSelectFont fs(aDC, font->GetHFONT());
Uniscribe us(aString + aRunStart, aRunLength, aTextRun);
/* itemize the string */
int numItems = us.Itemize();
SaveDC(aDC);
PRUint32 ivs = 0;
for (int i = 0; i < numItems; ++i) {
int iCharPos = us.ScriptItem(i)->iCharPos;
int iCharPosNext = us.ScriptItem(i+1)->iCharPos;
if (ivs) {
iCharPos += 2;
if (iCharPos >= iCharPosNext) {
ivs = 0;
continue;
}
}
if (i+1 < numItems && aRunStart + iCharPosNext <= aRunLength - 2
&& aString[aRunStart + iCharPosNext] == H_SURROGATE(kUnicodeVS17)
&& PRUint32(aString[aRunStart + iCharPosNext + 1]) - L_SURROGATE(kUnicodeVS17)
<= L_SURROGATE(kUnicodeVS256) - L_SURROGATE(kUnicodeVS17)) {
ivs = SURROGATE_TO_UCS4(aString[aRunStart + iCharPosNext],
aString[aRunStart + iCharPosNext + 1]);
} else {
ivs = 0;
}
UniscribeItem item(aContext, aDC, this,
aString + aRunStart + iCharPos,
iCharPosNext - iCharPos,
us.ScriptItem(i), ivs);
if (!item.AllocateBuffers()) {
result = PR_FALSE;
break;
}
if (!item.ShapingEnabled()) {
item.EnableShaping();
}
rv = item.Shape();
if (FAILED(rv)) {
PR_LOG(gFontLog, PR_LOG_DEBUG, ("shaping failed"));
// we know we have the glyphs to display this font already
// so Uniscribe just doesn't know how to shape the script.
// Render the glyphs without shaping.
item.DisableShaping();
rv = item.Shape();
}
#ifdef DEBUG
if (FAILED(rv)) {
NS_WARNING("Uniscribe failed to shape with font");
}
#endif
if (SUCCEEDED(rv)) {
rv = item.Place();
#ifdef DEBUG
if (FAILED(rv)) {
// crap fonts may fail when placing (e.g. funky free fonts)
NS_WARNING("Uniscribe failed to place with font");
}
#endif
}
if (FAILED(rv)) {
// Uniscribe doesn't like this font for some reason.
// Returning FALSE will make the gfxGDIFont retry with the
// "dumb" GDI one, unless useUniscribeOnly was set.
result = PR_FALSE;
break;
}
item.SaveGlyphs(aTextRun, aRunStart);
}
RestoreDC(aDC, -1);
return result;
}
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