michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: //#define FORCE_PR_LOG
michael@0: 
michael@0: #include "gfxGDIShaper.h"
michael@0: 
michael@0: /**********************************************************************
michael@0:  *
michael@0:  * class gfxGDIShaper
michael@0:  *
michael@0:  **********************************************************************/
michael@0: 
michael@0: bool
michael@0: gfxGDIShaper::ShapeText(gfxContext      *aContext,
michael@0:                         const char16_t *aText,
michael@0:                         uint32_t         aOffset,
michael@0:                         uint32_t         aLength,
michael@0:                         int32_t          aScript,
michael@0:                         gfxShapedText   *aShapedText)
michael@0: {
michael@0:     DCFromContext dc(aContext);
michael@0:     AutoSelectFont selectFont(dc, static_cast<gfxGDIFont*>(mFont)->GetHFONT());
michael@0: 
michael@0:     uint32_t length = aLength;
michael@0:     AutoFallibleTArray<WORD,500> glyphArray;
michael@0:     if (!glyphArray.SetLength(length)) {
michael@0:         return false;
michael@0:     }
michael@0:     WORD *glyphs = glyphArray.Elements();
michael@0: 
michael@0:     DWORD ret = ::GetGlyphIndicesW(dc, char16ptr_t(aText), length,
michael@0:                                    glyphs, GGI_MARK_NONEXISTING_GLYPHS);
michael@0:     if (ret == GDI_ERROR) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     for (int k = 0; k < length; k++) {
michael@0:         if (glyphs[k] == 0xFFFF)
michael@0:             return false;
michael@0:     }
michael@0:  
michael@0:     SIZE size;
michael@0:     AutoFallibleTArray<int,500> partialWidthArray;
michael@0:     if (!partialWidthArray.SetLength(length)) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     BOOL success = ::GetTextExtentExPointI(dc,
michael@0:                                            glyphs,
michael@0:                                            length,
michael@0:                                            INT_MAX,
michael@0:                                            nullptr,
michael@0:                                            partialWidthArray.Elements(),
michael@0:                                            &size);
michael@0:     if (!success) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     gfxTextRun::CompressedGlyph g;
michael@0:     gfxTextRun::CompressedGlyph *charGlyphs =
michael@0:         aShapedText->GetCharacterGlyphs();
michael@0:     uint32_t i;
michael@0:     int32_t lastWidth = 0;
michael@0:     int32_t appUnitsPerDevPixel = aShapedText->GetAppUnitsPerDevUnit();
michael@0:     for (i = 0; i < length; ++i) {
michael@0:         uint32_t offset = aOffset + i;
michael@0:         int32_t advancePixels = partialWidthArray[i] - lastWidth;
michael@0:         lastWidth = partialWidthArray[i];
michael@0:         int32_t advanceAppUnits = advancePixels * appUnitsPerDevPixel;
michael@0:         WCHAR glyph = glyphs[i];
michael@0:         NS_ASSERTION(!gfxFontGroup::IsInvalidChar(aText[i]),
michael@0:                      "Invalid character detected!");
michael@0:         bool atClusterStart = charGlyphs[offset].IsClusterStart();
michael@0:         if (advanceAppUnits >= 0 &&
michael@0:             gfxShapedWord::CompressedGlyph::IsSimpleAdvance(advanceAppUnits) &&
michael@0:             gfxShapedWord::CompressedGlyph::IsSimpleGlyphID(glyph) &&
michael@0:             atClusterStart)
michael@0:         {
michael@0:             charGlyphs[offset].SetSimpleGlyph(advanceAppUnits, glyph);
michael@0:         } else {
michael@0:             gfxShapedText::DetailedGlyph details;
michael@0:             details.mGlyphID = glyph;
michael@0:             details.mAdvance = advanceAppUnits;
michael@0:             details.mXOffset = 0;
michael@0:             details.mYOffset = 0;
michael@0:             aShapedText->SetGlyphs(offset,
michael@0:                                    g.SetComplex(atClusterStart, true, 1),
michael@0:                                    &details);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return true;
michael@0: }