gecko-dev/gfx/thebes/gfxGDIShaper.cpp

97 lines
3.3 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/. */
//#define FORCE_PR_LOG
#include "gfxGDIShaper.h"
/**********************************************************************
*
* class gfxGDIShaper
*
**********************************************************************/
bool
gfxGDIShaper::ShapeText(gfxContext *aContext,
const char16_t *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxShapedText *aShapedText)
{
DCFromContext dc(aContext);
AutoSelectFont selectFont(dc, static_cast<gfxGDIFont*>(mFont)->GetHFONT());
uint32_t length = aLength;
AutoFallibleTArray<WORD,500> glyphArray;
if (!glyphArray.SetLength(length)) {
return false;
}
WORD *glyphs = glyphArray.Elements();
DWORD ret = ::GetGlyphIndicesW(dc, char16ptr_t(aText), length,
glyphs, GGI_MARK_NONEXISTING_GLYPHS);
if (ret == GDI_ERROR) {
return false;
}
for (int k = 0; k < length; k++) {
if (glyphs[k] == 0xFFFF)
return false;
}
SIZE size;
AutoFallibleTArray<int,500> partialWidthArray;
if (!partialWidthArray.SetLength(length)) {
return false;
}
BOOL success = ::GetTextExtentExPointI(dc,
glyphs,
length,
INT_MAX,
nullptr,
partialWidthArray.Elements(),
&size);
if (!success) {
return false;
}
gfxTextRun::CompressedGlyph g;
gfxTextRun::CompressedGlyph *charGlyphs =
aShapedText->GetCharacterGlyphs();
uint32_t i;
int32_t lastWidth = 0;
int32_t appUnitsPerDevPixel = aShapedText->GetAppUnitsPerDevUnit();
for (i = 0; i < length; ++i) {
uint32_t offset = aOffset + i;
int32_t advancePixels = partialWidthArray[i] - lastWidth;
lastWidth = partialWidthArray[i];
int32_t advanceAppUnits = advancePixels * appUnitsPerDevPixel;
WCHAR glyph = glyphs[i];
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(aText[i]),
"Invalid character detected!");
bool atClusterStart = charGlyphs[offset].IsClusterStart();
if (advanceAppUnits >= 0 &&
gfxShapedWord::CompressedGlyph::IsSimpleAdvance(advanceAppUnits) &&
gfxShapedWord::CompressedGlyph::IsSimpleGlyphID(glyph) &&
atClusterStart)
{
charGlyphs[offset].SetSimpleGlyph(advanceAppUnits, glyph);
} else {
gfxShapedText::DetailedGlyph details;
details.mGlyphID = glyph;
details.mAdvance = advanceAppUnits;
details.mXOffset = 0;
details.mYOffset = 0;
aShapedText->SetGlyphs(offset,
g.SetComplex(atClusterStart, true, 1),
&details);
}
}
return true;
}