gfx/thebes/gfxGDIShaper.cpp@97036ab72558 (annotated)
gfx/thebes/gfxGDIShaper.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | //#define FORCE_PR_LOG |
| michael@0 | 7 | |
| michael@0 | 8 | #include "gfxGDIShaper.h" |
| michael@0 | 9 | |
| michael@0 | 10 | /********************************************************************** |
| michael@0 | 11 | * |
| michael@0 | 12 | * class gfxGDIShaper |
| michael@0 | 13 | * |
| michael@0 | 14 | **********************************************************************/ |
| michael@0 | 15 | |
| michael@0 | 16 | bool |
| michael@0 | 17 | gfxGDIShaper::ShapeText(gfxContext *aContext, |
| michael@0 | 18 | const char16_t *aText, |
| michael@0 | 19 | uint32_t aOffset, |
| michael@0 | 20 | uint32_t aLength, |
| michael@0 | 21 | int32_t aScript, |
| michael@0 | 22 | gfxShapedText *aShapedText) |
| michael@0 | 23 | { |
| michael@0 | 24 | DCFromContext dc(aContext); |
| michael@0 | 25 | AutoSelectFont selectFont(dc, static_cast<gfxGDIFont*>(mFont)->GetHFONT()); |
| michael@0 | 26 | |
| michael@0 | 27 | uint32_t length = aLength; |
| michael@0 | 28 | AutoFallibleTArray<WORD,500> glyphArray; |
| michael@0 | 29 | if (!glyphArray.SetLength(length)) { |
| michael@0 | 30 | return false; |
| michael@0 | 31 | } |
| michael@0 | 32 | WORD *glyphs = glyphArray.Elements(); |
| michael@0 | 33 | |
| michael@0 | 34 | DWORD ret = ::GetGlyphIndicesW(dc, char16ptr_t(aText), length, |
| michael@0 | 35 | glyphs, GGI_MARK_NONEXISTING_GLYPHS); |
| michael@0 | 36 | if (ret == GDI_ERROR) { |
| michael@0 | 37 | return false; |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | for (int k = 0; k < length; k++) { |
| michael@0 | 41 | if (glyphs[k] == 0xFFFF) |
| michael@0 | 42 | return false; |
| michael@0 | 43 | } |
| michael@0 | 44 | |
| michael@0 | 45 | SIZE size; |
| michael@0 | 46 | AutoFallibleTArray<int,500> partialWidthArray; |
| michael@0 | 47 | if (!partialWidthArray.SetLength(length)) { |
| michael@0 | 48 | return false; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | BOOL success = ::GetTextExtentExPointI(dc, |
| michael@0 | 52 | glyphs, |
| michael@0 | 53 | length, |
| michael@0 | 54 | INT_MAX, |
| michael@0 | 55 | nullptr, |
| michael@0 | 56 | partialWidthArray.Elements(), |
| michael@0 | 57 | &size); |
| michael@0 | 58 | if (!success) { |
| michael@0 | 59 | return false; |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | gfxTextRun::CompressedGlyph g; |
| michael@0 | 63 | gfxTextRun::CompressedGlyph *charGlyphs = |
| michael@0 | 64 | aShapedText->GetCharacterGlyphs(); |
| michael@0 | 65 | uint32_t i; |
| michael@0 | 66 | int32_t lastWidth = 0; |
| michael@0 | 67 | int32_t appUnitsPerDevPixel = aShapedText->GetAppUnitsPerDevUnit(); |
| michael@0 | 68 | for (i = 0; i < length; ++i) { |
| michael@0 | 69 | uint32_t offset = aOffset + i; |
| michael@0 | 70 | int32_t advancePixels = partialWidthArray[i] - lastWidth; |
| michael@0 | 71 | lastWidth = partialWidthArray[i]; |
| michael@0 | 72 | int32_t advanceAppUnits = advancePixels * appUnitsPerDevPixel; |
| michael@0 | 73 | WCHAR glyph = glyphs[i]; |
| michael@0 | 74 | NS_ASSERTION(!gfxFontGroup::IsInvalidChar(aText[i]), |
| michael@0 | 75 | "Invalid character detected!"); |
| michael@0 | 76 | bool atClusterStart = charGlyphs[offset].IsClusterStart(); |
| michael@0 | 77 | if (advanceAppUnits >= 0 && |
| michael@0 | 78 | gfxShapedWord::CompressedGlyph::IsSimpleAdvance(advanceAppUnits) && |
| michael@0 | 79 | gfxShapedWord::CompressedGlyph::IsSimpleGlyphID(glyph) && |
| michael@0 | 80 | atClusterStart) |
| michael@0 | 81 | { |
| michael@0 | 82 | charGlyphs[offset].SetSimpleGlyph(advanceAppUnits, glyph); |
| michael@0 | 83 | } else { |
| michael@0 | 84 | gfxShapedText::DetailedGlyph details; |
| michael@0 | 85 | details.mGlyphID = glyph; |
| michael@0 | 86 | details.mAdvance = advanceAppUnits; |
| michael@0 | 87 | details.mXOffset = 0; |
| michael@0 | 88 | details.mYOffset = 0; |
| michael@0 | 89 | aShapedText->SetGlyphs(offset, |
| michael@0 | 90 | g.SetComplex(atClusterStart, true, 1), |
| michael@0 | 91 | &details); |
| michael@0 | 92 | } |
| michael@0 | 93 | } |
| michael@0 | 94 | |
| michael@0 | 95 | return true; |
| michael@0 | 96 | } |
