gecko-dev/gfx/thebes/gfxGDIShaper.cpp

132 lines
5.0 KiB
C++

/* -*- 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 "gfxGDIShaper.h"
/**********************************************************************
*
* class gfxGDIShaper
*
**********************************************************************/
PRBool
gfxGDIShaper::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript)
{
gfxGDIFont *f = static_cast<gfxGDIFont*>(mFont);
DCFromContext dc(aContext);
AutoSelectFont fs(dc, f->GetHFONT());
nsAutoTArray<WORD,500> glyphArray;
if (!glyphArray.SetLength(aRunLength)) {
return PR_FALSE;
}
WORD *glyphs = glyphArray.Elements();
DWORD ret = ::GetGlyphIndicesW(dc, aString + aRunStart, aRunLength,
glyphs, GGI_MARK_NONEXISTING_GLYPHS);
if (ret == GDI_ERROR) {
return PR_FALSE;
}
for (int k = 0; k < aRunLength; k++) {
if (glyphs[k] == 0xFFFF)
return PR_FALSE;
}
SIZE size;
nsAutoTArray<int,500> partialWidthArray;
if (!partialWidthArray.SetLength(aRunLength)) {
return PR_FALSE;
}
BOOL success = ::GetTextExtentExPointI(dc,
glyphs,
aRunLength,
INT_MAX,
NULL,
partialWidthArray.Elements(),
&size);
if (!success) {
return PR_FALSE;
}
gfxTextRun::CompressedGlyph g;
PRUint32 i;
PRInt32 lastWidth = 0;
PRUint32 appUnitsPerDevPixel = aTextRun->GetAppUnitsPerDevUnit();
for (i = 0; i < aRunLength; ++i) {
PRUint32 offset = aRunStart + i;
PRInt32 advancePixels = partialWidthArray[i] - lastWidth;
lastWidth = partialWidthArray[i];
PRInt32 advanceAppUnits = advancePixels*appUnitsPerDevPixel;
WCHAR glyph = glyphs[i];
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(aTextRun->GetChar(offset)),
"Invalid character detected!");
PRBool atClusterStart = aTextRun->IsClusterStart(offset);
if (advanceAppUnits >= 0 &&
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advanceAppUnits) &&
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(glyph) &&
atClusterStart)
{
aTextRun->SetSimpleGlyph(offset,
g.SetSimpleGlyph(advanceAppUnits, glyph));
} else {
gfxTextRun::DetailedGlyph details;
details.mGlyphID = glyph;
details.mAdvance = advanceAppUnits;
details.mXOffset = 0;
details.mYOffset = 0;
aTextRun->SetGlyphs(offset,
g.SetComplex(atClusterStart, PR_TRUE, 1),
&details);
}
}
return PR_TRUE;
}