| /* |
| * Copyright (C) 2017-2019 Apple 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: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "ComplexTextController.h" |
| |
| #if !USE(DIRECT2D) |
| |
| #include "FontCache.h" |
| #include "FontCascade.h" |
| #include "HWndDC.h" |
| #include <usp10.h> |
| |
| namespace WebCore { |
| |
| static bool shapeByUniscribe(const UChar* str, int len, SCRIPT_ITEM item, const Font* fontData, |
| Vector<WORD>& glyphs, Vector<WORD>& clusters, |
| Vector<SCRIPT_VISATTR>& visualAttributes) |
| { |
| HWndDC hdc; |
| HGDIOBJ oldFont = nullptr; |
| HRESULT shapeResult = E_PENDING; |
| int glyphCount = 0; |
| |
| if (!fontData) |
| return false; |
| |
| do { |
| shapeResult = ScriptShape(hdc, fontData->scriptCache(), wcharFrom(str), len, glyphs.size(), &item.a, |
| glyphs.data(), clusters.data(), visualAttributes.data(), &glyphCount); |
| if (shapeResult == E_PENDING) { |
| // The script cache isn't primed with enough info yet. We need to select our HFONT into |
| // a DC and pass the DC in to ScriptShape. |
| ASSERT(!hdc); |
| hdc.setHWnd(nullptr); |
| HFONT hfont = fontData->platformData().hfont(); |
| oldFont = SelectObject(hdc, hfont); |
| } else if (shapeResult == E_OUTOFMEMORY) { |
| // Need to resize our buffers. |
| glyphs.resize(glyphs.size() * 2); |
| visualAttributes.resize(glyphs.size()); |
| } |
| } while (shapeResult == E_PENDING || shapeResult == E_OUTOFMEMORY); |
| |
| if (hdc) |
| SelectObject(hdc, oldFont); |
| |
| if (FAILED(shapeResult)) |
| return false; |
| |
| glyphs.shrink(glyphCount); |
| visualAttributes.shrink(glyphCount); |
| |
| return true; |
| } |
| |
| void ComplexTextController::collectComplexTextRunsForCharacters(const UChar* cp, unsigned stringLength, unsigned stringLocation, const Font* font) |
| { |
| if (!font) { |
| // Create a run of missing glyphs from the primary font. |
| m_complexTextRuns.append(ComplexTextRun::create(m_font.primaryFont(), cp, stringLocation, stringLength, 0, stringLength, m_run.ltr())); |
| return; |
| } |
| |
| Vector<SCRIPT_ITEM> items(6); |
| int numItems = 0; |
| for (;;) { |
| SCRIPT_CONTROL control { }; |
| SCRIPT_STATE state { }; |
| // Set up the correct direction for the run. |
| state.uBidiLevel = m_run.rtl(); |
| // Lock the correct directional override. |
| state.fOverrideDirection = m_run.directionalOverride(); |
| |
| // ScriptItemize may write (cMaxItems + 1) SCRIPT_ITEM. |
| HRESULT hr = ScriptItemize(wcharFrom(cp), stringLength, items.size() - 1, &control, &state, items.data(), &numItems); |
| if (hr != E_OUTOFMEMORY) { |
| ASSERT(SUCCEEDED(hr)); |
| break; |
| } |
| items.resize(items.size() * 2); |
| } |
| items.resize(numItems + 1); |
| |
| for (int i = 0; i < numItems; i++) { |
| // Determine the string for this item. |
| const UChar* str = cp + items[i].iCharPos; |
| int length = items[i+1].iCharPos - items[i].iCharPos; |
| SCRIPT_ITEM& item = items[i]; |
| |
| // Set up buffers to hold the results of shaping the item. |
| Vector<WORD> glyphs; |
| Vector<WORD> clusters; |
| Vector<SCRIPT_VISATTR> visualAttributes; |
| clusters.resize(length); |
| |
| // Shape the item. |
| // The recommended size for the glyph buffer is 1.5 * the character length + 16 in the uniscribe docs. |
| // Apparently this is a good size to avoid having to make repeated calls to ScriptShape. |
| glyphs.resize(1.5 * length + 16); |
| visualAttributes.resize(glyphs.size()); |
| |
| if (!shapeByUniscribe(str, length, item, font, glyphs, clusters, visualAttributes)) |
| continue; |
| |
| // We now have a collection of glyphs. |
| Vector<GOFFSET> offsets; |
| Vector<int> advances; |
| offsets.resize(glyphs.size()); |
| advances.resize(glyphs.size()); |
| HRESULT placeResult = ScriptPlace(0, font->scriptCache(), glyphs.data(), glyphs.size(), visualAttributes.data(), |
| &item.a, advances.data(), offsets.data(), 0); |
| if (placeResult == E_PENDING) { |
| // The script cache isn't primed with enough info yet. We need to select our HFONT into |
| // a DC and pass the DC in to ScriptPlace. |
| HWndDC hdc(0); |
| HFONT hfont = font->platformData().hfont(); |
| HGDIOBJ oldFont = SelectObject(hdc, hfont); |
| placeResult = ScriptPlace(hdc, font->scriptCache(), glyphs.data(), glyphs.size(), visualAttributes.data(), |
| &item.a, advances.data(), offsets.data(), 0); |
| SelectObject(hdc, oldFont); |
| } |
| |
| if (FAILED(placeResult) || glyphs.isEmpty()) |
| continue; |
| |
| if (m_fallbackFonts) |
| m_fallbackFonts->add(font); |
| |
| Vector<unsigned> stringIndices(glyphs.size(), item.iCharPos); |
| |
| for (int k = length - 1; k >= 0; k--) |
| stringIndices[clusters[k]] = item.iCharPos + k; |
| |
| Vector<FloatSize> baseAdvances; |
| Vector<FloatPoint> origins; |
| baseAdvances.reserveCapacity(glyphs.size()); |
| origins.reserveCapacity(glyphs.size()); |
| |
| for (unsigned k = 0; k < glyphs.size(); k++) { |
| const float cLogicalScale = font->platformData().useGDI() ? 1 : 32; |
| float advance = advances[k] / cLogicalScale; |
| float offsetX = offsets[k].du / cLogicalScale; |
| float offsetY = offsets[k].dv / cLogicalScale; |
| |
| // Match AppKit's rules for the integer vs. non-integer rendering modes. |
| if (!font->platformData().isSystemFont()) { |
| advance = roundf(advance); |
| offsetX = roundf(offsetX); |
| offsetY = roundf(offsetY); |
| } |
| |
| baseAdvances.uncheckedAppend({ advance, 0 }); |
| origins.uncheckedAppend({ offsetX, offsetY }); |
| } |
| FloatSize initialAdvance = toFloatSize(origins[0]); |
| bool ltr = !item.a.fRTL; |
| m_complexTextRuns.append(ComplexTextRun::create(baseAdvances, origins, glyphs, stringIndices, initialAdvance, *font, cp, stringLocation, stringLength, item.iCharPos, items[i+1].iCharPos, ltr)); |
| } |
| } |
| |
| } |
| |
| #endif // !USE(DIRECT2D) |
