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Diffstat (limited to 'WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp')
| -rw-r--r-- | WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp b/WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp deleted file mode 100644 index e71f66a..0000000 --- a/WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp +++ /dev/null @@ -1,239 +0,0 @@ -/* - * Copyright (c) 2008, 2009 Google Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following disclaimer - * in the documentation and/or other materials provided with the - * distribution. - * * Neither the name of Google Inc. nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "config.h" -#include <windows.h> -#include <vector> - -#include "ChromiumBridge.h" -#include "Font.h" -#include "GlyphPageTreeNode.h" -#include "SimpleFontData.h" -#include "UniscribeHelperTextRun.h" -#include "WindowsVersion.h" - -namespace WebCore { - -// Fills one page of font data pointers with 0 to indicate that there -// are no glyphs for the characters. -static void fillEmptyGlyphs(GlyphPage* page) -{ - for (int i = 0; i < GlyphPage::size; ++i) - page->setGlyphDataForIndex(i, 0, 0); -} - -// Lazily initializes space glyph -static Glyph initSpaceGlyph(HDC dc, Glyph* spaceGlyph) -{ - if (*spaceGlyph) - return *spaceGlyph; - - static wchar_t space = ' '; - GetGlyphIndices(dc, &space, 1, spaceGlyph, 0); - return *spaceGlyph; -} - -// Fills |length| glyphs starting at |offset| in a |page| in the Basic -// Multilingual Plane (<= U+FFFF). The input buffer size should be the -// same as |length|. We can use the standard Windows GDI functions here. -// Returns true if any glyphs were found. -static bool fillBMPGlyphs(unsigned offset, - unsigned length, - UChar* buffer, - GlyphPage* page, - const SimpleFontData* fontData, - bool recurse) -{ - HDC dc = GetDC((HWND)0); - HGDIOBJ oldFont = SelectObject(dc, fontData->platformData().hfont()); - - TEXTMETRIC tm = {0}; - if (!GetTextMetrics(dc, &tm)) { - SelectObject(dc, oldFont); - ReleaseDC(0, dc); - - if (recurse) { - if (ChromiumBridge::ensureFontLoaded(fontData->platformData().hfont())) - return fillBMPGlyphs(offset, length, buffer, page, fontData, false); - else { - fillEmptyGlyphs(page); - return false; - } - } else { - // FIXME: Handle gracefully the error if this call also fails. - // See http://crbug.com/6401 - LOG_ERROR("Unable to get the text metrics after second attempt"); - fillEmptyGlyphs(page); - return false; - } - } - - // FIXME: GetGlyphIndices() sets each item of localGlyphBuffer[] - // with the one of the values listed below. - // * With the GGI_MARK_NONEXISTING_GLYPHS flag - // + If the font has a glyph available for the character, - // localGlyphBuffer[i] > 0x0. - // + If the font does not have glyphs available for the character, - // localGlyphBuffer[i] = 0x1F (TrueType Collection?) or - // 0xFFFF (OpenType?). - // * Without the GGI_MARK_NONEXISTING_GLYPHS flag - // + If the font has a glyph available for the character, - // localGlyphBuffer[i] > 0x0. - // + If the font does not have glyphs available for the character, - // localGlyphBuffer[i] = 0x80. - // (Windows automatically assigns the glyph for a box character to - // prevent ExtTextOut() from returning errors.) - // To avoid from hurting the rendering performance, this code just - // tells WebKit whether or not the all glyph indices for the given - // characters are 0x80 (i.e. a possibly-invalid glyph) and let it - // use alternative fonts for the characters. - // Although this may cause a problem, it seems to work fine as far as I - // have tested. (Obviously, I need more tests.) - WORD localGlyphBuffer[GlyphPage::size]; - - // FIXME: I find some Chinese characters can not be correctly displayed - // when call GetGlyphIndices without flag GGI_MARK_NONEXISTING_GLYPHS, - // because the corresponding glyph index is set as 0x20 when current font - // does not have glyphs available for the character. According a blog post - // http://blogs.msdn.com/michkap/archive/2006/06/28/649791.aspx - // I think we should switch to the way about calling GetGlyphIndices with - // flag GGI_MARK_NONEXISTING_GLYPHS, it should be OK according the - // description of MSDN. - // Also according to Jungshik and Hironori's suggestion and modification - // we treat turetype and raster Font as different way when windows version - // is less than Vista. - GetGlyphIndices(dc, buffer, length, localGlyphBuffer, GGI_MARK_NONEXISTING_GLYPHS); - - // Copy the output to the GlyphPage - bool haveGlyphs = false; - int invalidGlyph = 0xFFFF; - const DWORD cffTableTag = 0x20464643; // 4-byte identifier for OpenType CFF table ('CFF '). - if (!isVistaOrNewer() && !(tm.tmPitchAndFamily & TMPF_TRUETYPE) && (GetFontData(dc, cffTableTag, 0, 0, 0) == GDI_ERROR)) - invalidGlyph = 0x1F; - - Glyph spaceGlyph = 0; // Glyph for a space. Lazily filled. - - for (unsigned i = 0; i < length; i++) { - UChar c = buffer[i]; - Glyph glyph = localGlyphBuffer[i]; - const SimpleFontData* glyphFontData = fontData; - // When this character should be a space, we ignore whatever the font - // says and use a space. Otherwise, if fonts don't map one of these - // space or zero width glyphs, we will get a box. - if (Font::treatAsSpace(c)) { - // Hard code the glyph indices for characters that should be - // treated like spaces. - glyph = initSpaceGlyph(dc, &spaceGlyph); - } else if (glyph == invalidGlyph) { - // WebKit expects both the glyph index and FontData - // pointer to be 0 if the glyph is not present - glyph = 0; - glyphFontData = 0; - } else - haveGlyphs = true; - page->setGlyphDataForCharacter(offset + i, glyph, glyphFontData); - } - - SelectObject(dc, oldFont); - ReleaseDC(0, dc); - return haveGlyphs; -} - -// For non-BMP characters, each is two words (UTF-16) and the input buffer -// size is 2 * |length|. Since GDI doesn't know how to handle non-BMP -// characters, we must use Uniscribe to tell us the glyph indices. -// -// We don't want to call this in the case of "regular" characters since some -// fonts may not have the correct combining rules for accents. See the notes -// at the bottom of ScriptGetCMap. We can't use ScriptGetCMap, though, since -// it doesn't seem to support UTF-16, despite what this blog post says: -// http://blogs.msdn.com/michkap/archive/2006/06/29/650680.aspx -// -// So we fire up the full Uniscribe doohicky, give it our string, and it will -// correctly handle the UTF-16 for us. The hard part is taking this and getting -// the glyph indices back out that correspond to the correct input characters, -// since they may be missing. -// -// Returns true if any glyphs were found. -static bool fillNonBMPGlyphs(unsigned offset, - unsigned length, - UChar* buffer, - GlyphPage* page, - const SimpleFontData* fontData) -{ - bool haveGlyphs = false; - - UniscribeHelperTextRun state(buffer, length * 2, false, - fontData->platformData().hfont(), - fontData->platformData().scriptCache(), - fontData->platformData().scriptFontProperties()); - state.setInhibitLigate(true); - state.setDisableFontFallback(true); - state.init(); - - for (unsigned i = 0; i < length; i++) { - // Each character in this input buffer is a surrogate pair, which - // consists of two UChars. So, the offset for its i-th character is - // (i * 2). - WORD glyph = state.firstGlyphForCharacter(i * 2); - if (glyph) { - haveGlyphs = true; - page->setGlyphDataForIndex(offset + i, glyph, fontData); - } else - // Clear both glyph and fontData fields. - page->setGlyphDataForIndex(offset + i, 0, 0); - } - return haveGlyphs; -} - -// We're supposed to return true if there are any glyphs in the range -// specified by |offset| and |length| in our font, -// false if there are none. -bool GlyphPage::fill(unsigned offset, unsigned length, UChar* characterBuffer, - unsigned bufferLength, const SimpleFontData* fontData) -{ - // We have to handle BMP and non-BMP characters differently. - // FIXME: Add assertions to make sure that buffer is entirely in BMP - // or entirely in non-BMP. - if (bufferLength == length) - return fillBMPGlyphs(offset, length, characterBuffer, this, fontData, true); - - if (bufferLength == 2 * length) { - // A non-BMP input buffer will be twice as long as output glyph buffer - // because each character in the non-BMP input buffer will be - // represented by a surrogate pair (two UChar's). - return fillNonBMPGlyphs(offset, length, characterBuffer, this, fontData); - } - - ASSERT_NOT_REACHED(); - return false; -} - -} // namespace WebCore |