| /* |
| * Copyright (C) 2007, 2008, 2009, 2010 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 "UniscribeController.h" |
| |
| #include "Font.h" |
| #include "FontCascade.h" |
| #include "HWndDC.h" |
| #include "TextRun.h" |
| #include <wtf/MathExtras.h> |
| |
| using namespace WTF; |
| using namespace Unicode; |
| using namespace std; |
| |
| namespace WebCore { |
| |
| // FIXME: Rearchitect this to be more like WidthIterator in Font.cpp. Have an advance() method |
| // that does stuff in that method instead of doing everything in the constructor. Have advance() |
| // take the GlyphBuffer as an arg so that we don't have to populate the glyph buffer when |
| // measuring. |
| UniscribeController::UniscribeController(const FontCascade* font, const TextRun& run, HashSet<const Font*>* fallbackFonts) |
| : m_font(*font) |
| , m_run(run) |
| , m_fallbackFonts(fallbackFonts) |
| , m_minGlyphBoundingBoxX(numeric_limits<float>::max()) |
| , m_maxGlyphBoundingBoxX(numeric_limits<float>::min()) |
| , m_minGlyphBoundingBoxY(numeric_limits<float>::max()) |
| , m_maxGlyphBoundingBoxY(numeric_limits<float>::min()) |
| , m_end(run.length()) |
| , m_currentCharacter(0) |
| , m_runWidthSoFar(0) |
| , m_padding(run.expansion()) |
| , m_computingOffsetPosition(false) |
| , m_includePartialGlyphs(false) |
| , m_offsetX(0) |
| , m_offsetPosition(0) |
| { |
| if (!m_padding) |
| m_padPerSpace = 0; |
| else { |
| float numSpaces = 0; |
| for (int s = 0; s < m_run.length(); s++) { |
| if (FontCascade::treatAsSpace(m_run[s])) |
| numSpaces++; |
| } |
| |
| if (numSpaces == 0) |
| m_padPerSpace = 0; |
| else |
| m_padPerSpace = m_padding / numSpaces; |
| } |
| |
| // Null out our uniscribe structs |
| resetControlAndState(); |
| } |
| |
| int UniscribeController::offsetForPosition(int x, bool includePartialGlyphs) |
| { |
| m_computingOffsetPosition = true; |
| m_includePartialGlyphs = includePartialGlyphs; |
| m_offsetX = x; |
| m_offsetPosition = 0; |
| advance(m_run.length()); |
| if (m_computingOffsetPosition) { |
| // The point is to the left or to the right of the entire run. |
| if (m_offsetX >= m_runWidthSoFar && m_run.ltr() || m_offsetX < 0 && m_run.rtl()) |
| m_offsetPosition = m_end; |
| } |
| m_computingOffsetPosition = false; |
| return m_offsetPosition; |
| } |
| |
| void UniscribeController::advance(unsigned offset, GlyphBuffer* glyphBuffer) |
| { |
| // FIXME: We really want to be using a newer version of Uniscribe that supports the new OpenType |
| // functions. Those functions would allow us to turn off kerning and ligatures. Without being able |
| // to do that, we will have buggy line breaking and metrics when simple and complex text are close |
| // together (the complex code path will narrow the text because of kerning and ligatures and then |
| // when bidi processing splits into multiple runs, the simple portions will get wider and cause us to |
| // spill off the edge of a line). |
| if (static_cast<int>(offset) > m_end) |
| offset = m_end; |
| |
| int length = offset - m_currentCharacter; |
| if (length <= 0) |
| return; |
| |
| String bufferFor16BitData; |
| |
| // Itemize the string. |
| const UChar* cp = nullptr; |
| if (m_run.is8Bit()) { |
| // Uniscribe only deals with 16-bit characters. Must generate them now. |
| bufferFor16BitData = String::make16BitFrom8BitSource(m_run.data8(m_currentCharacter), length); |
| cp = bufferFor16BitData.characters16(); |
| } else |
| cp = m_run.data16(m_currentCharacter); |
| |
| unsigned baseCharacter = m_currentCharacter; |
| |
| // We break up itemization of the string by fontData and (if needed) the use of small caps. |
| |
| // FIXME: It's inconsistent that we use logical order when itemizing, since this |
| // does not match normal RTL. |
| |
| // FIXME: This function should decode surrogate pairs. Currently it makes little difference that |
| // it does not because the font cache on Windows does not support non-BMP characters. |
| Vector<UChar, 256> smallCapsBuffer; |
| if (m_font.isSmallCaps()) |
| smallCapsBuffer.resize(length); |
| |
| unsigned indexOfFontTransition = m_run.rtl() ? length - 1 : 0; |
| const UChar* curr = m_run.rtl() ? cp + length - 1 : cp; |
| const UChar* end = m_run.rtl() ? cp - 1 : cp + length; |
| |
| const Font* fontData; |
| const Font* nextFontData = m_font.glyphDataForCharacter(*curr, false).font; |
| |
| UChar newC = 0; |
| |
| bool isSmallCaps; |
| bool nextIsSmallCaps = m_font.isSmallCaps() && !(U_GET_GC_MASK(*curr) & U_GC_M_MASK) && (newC = u_toupper(*curr)) != *curr; |
| |
| if (nextIsSmallCaps) |
| smallCapsBuffer[curr - cp] = newC; |
| |
| while (true) { |
| curr = m_run.rtl() ? curr - 1 : curr + 1; |
| if (curr == end) |
| break; |
| |
| fontData = nextFontData; |
| isSmallCaps = nextIsSmallCaps; |
| int index = curr - cp; |
| UChar c = *curr; |
| |
| bool forceSmallCaps = isSmallCaps && (U_GET_GC_MASK(c) & U_GC_M_MASK); |
| nextFontData = m_font.glyphDataForCharacter(*curr, false, forceSmallCaps ? SmallCapsVariant : AutoVariant).font; |
| if (m_font.isSmallCaps()) { |
| nextIsSmallCaps = forceSmallCaps || (newC = u_toupper(c)) != c; |
| if (nextIsSmallCaps) |
| smallCapsBuffer[index] = forceSmallCaps ? c : newC; |
| } |
| |
| if (m_fallbackFonts && fontData && nextFontData != fontData && fontData != &m_font.primaryFont()) |
| m_fallbackFonts->add(fontData); |
| |
| if (nextFontData != fontData || nextIsSmallCaps != isSmallCaps) { |
| int itemStart = m_run.rtl() ? index + 1 : indexOfFontTransition; |
| int itemLength = m_run.rtl() ? indexOfFontTransition - index : index - indexOfFontTransition; |
| m_currentCharacter = baseCharacter + itemStart; |
| itemizeShapeAndPlace((isSmallCaps ? smallCapsBuffer.data() : cp) + itemStart, itemLength, fontData, glyphBuffer); |
| indexOfFontTransition = index; |
| } |
| } |
| |
| int itemLength = m_run.rtl() ? indexOfFontTransition + 1 : length - indexOfFontTransition; |
| if (itemLength) { |
| if (m_fallbackFonts && nextFontData && nextFontData != &m_font.primaryFont()) |
| m_fallbackFonts->add(nextFontData); |
| |
| int itemStart = m_run.rtl() ? 0 : indexOfFontTransition; |
| m_currentCharacter = baseCharacter + itemStart; |
| itemizeShapeAndPlace((nextIsSmallCaps ? smallCapsBuffer.data() : cp) + itemStart, itemLength, nextFontData, glyphBuffer); |
| } |
| |
| m_currentCharacter = baseCharacter + length; |
| } |
| |
| void UniscribeController::itemizeShapeAndPlace(const UChar* cp, unsigned length, const Font* fontData, GlyphBuffer* glyphBuffer) |
| { |
| // ScriptItemize (in Windows XP versions prior to SP2) can overflow by 1. This is why there is an extra empty item |
| // hanging out at the end of the array |
| m_items.resize(6); |
| int numItems = 0; |
| HRESULT rc = S_OK; |
| while (rc = ::ScriptItemize(cp, length, m_items.size() - 1, &m_control, &m_state, m_items.data(), &numItems) == E_OUTOFMEMORY) { |
| m_items.resize(m_items.size() * 2); |
| resetControlAndState(); |
| } |
| if (FAILED(rc)) { |
| WTFLogAlways("UniscribeController::itemizeShapeAndPlace: ScriptItemize failed, rc=%lx", rc); |
| return; |
| } |
| m_items.resize(numItems + 1); |
| |
| if (m_run.rtl()) { |
| for (int i = m_items.size() - 2; i >= 0; i--) { |
| if (!shapeAndPlaceItem(cp, i, fontData, glyphBuffer)) |
| return; |
| } |
| } else { |
| for (unsigned i = 0; i < m_items.size() - 1; i++) { |
| if (!shapeAndPlaceItem(cp, i, fontData, glyphBuffer)) |
| return; |
| } |
| } |
| } |
| |
| void UniscribeController::resetControlAndState() |
| { |
| memset(&m_control, 0, sizeof(SCRIPT_CONTROL)); |
| memset(&m_state, 0, sizeof(SCRIPT_STATE)); |
| |
| // Set up the correct direction for the run. |
| m_state.uBidiLevel = m_run.rtl(); |
| |
| // Lock the correct directional override. |
| m_state.fOverrideDirection = m_run.directionalOverride(); |
| } |
| |
| bool UniscribeController::shapeAndPlaceItem(const UChar* cp, unsigned i, const Font* fontData, GlyphBuffer* glyphBuffer) |
| { |
| // Determine the string for this item. |
| const UChar* str = cp + m_items[i].iCharPos; |
| int len = m_items[i+1].iCharPos - m_items[i].iCharPos; |
| SCRIPT_ITEM item = m_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(len); |
| |
| // 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 * len + 16); |
| visualAttributes.resize(glyphs.size()); |
| |
| if (!shape(str, len, item, fontData, glyphs, clusters, visualAttributes)) |
| return true; |
| |
| // We now have a collection of glyphs. |
| Vector<GOFFSET> offsets; |
| Vector<int> advances; |
| offsets.resize(glyphs.size()); |
| advances.resize(glyphs.size()); |
| int glyphCount = 0; |
| HRESULT placeResult = ScriptPlace(0, fontData->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 = fontData->platformData().hfont(); |
| HFONT oldFont = (HFONT)SelectObject(hdc, hfont); |
| placeResult = ScriptPlace(hdc, fontData->scriptCache(), glyphs.data(), glyphs.size(), visualAttributes.data(), |
| &item.a, advances.data(), offsets.data(), 0); |
| SelectObject(hdc, oldFont); |
| } |
| |
| if (FAILED(placeResult) || glyphs.isEmpty()) |
| return true; |
| |
| // Convert all chars that should be treated as spaces to use the space glyph. |
| // We also create a map that allows us to quickly go from space glyphs back to their corresponding characters. |
| Vector<int> spaceCharacters(glyphs.size()); |
| spaceCharacters.fill(-1); |
| |
| const float cLogicalScale = fontData->platformData().useGDI() ? 1.0f : 32.0f; |
| float spaceWidth = fontData->spaceWidth() - fontData->syntheticBoldOffset(); |
| unsigned logicalSpaceWidth = spaceWidth * cLogicalScale; |
| |
| for (int k = 0; k < len; k++) { |
| UChar ch = *(str + k); |
| bool treatAsSpace = FontCascade::treatAsSpace(ch); |
| bool treatAsZeroWidthSpace = FontCascade::treatAsZeroWidthSpace(ch); |
| if (treatAsSpace || treatAsZeroWidthSpace) { |
| // Substitute in the space glyph at the appropriate place in the glyphs |
| // array. |
| glyphs[clusters[k]] = fontData->spaceGlyph(); |
| advances[clusters[k]] = treatAsSpace ? logicalSpaceWidth : 0; |
| if (treatAsSpace) |
| spaceCharacters[clusters[k]] = m_currentCharacter + k + item.iCharPos; |
| } |
| } |
| |
| // Populate our glyph buffer with this information. |
| bool hasExtraSpacing = m_font.letterSpacing() || m_font.wordSpacing() || m_padding; |
| |
| float leftEdge = m_runWidthSoFar; |
| |
| for (unsigned k = 0; k < glyphs.size(); k++) { |
| Glyph glyph = glyphs[k]; |
| 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. |
| float roundedAdvance = roundf(advance); |
| if (!fontData->isSystemFont()) { |
| advance = roundedAdvance; |
| offsetX = roundf(offsetX); |
| offsetY = roundf(offsetY); |
| } |
| |
| advance += fontData->syntheticBoldOffset(); |
| |
| if (hasExtraSpacing) { |
| // If we're a glyph with an advance, go ahead and add in letter-spacing. |
| // That way we weed out zero width lurkers. This behavior matches the fast text code path. |
| if (advance && m_font.letterSpacing()) |
| advance += m_font.letterSpacing(); |
| |
| // Handle justification and word-spacing. |
| int characterIndex = spaceCharacters[k]; |
| // characterIndex is left at the initial value of -1 for glyphs that do not map back to treated-as-space characters. |
| if (characterIndex != -1) { |
| // Account for padding. WebCore uses space padding to justify text. |
| // We distribute the specified padding over the available spaces in the run. |
| if (m_padding) { |
| // Use leftover padding if not evenly divisible by number of spaces. |
| if (m_padding < m_padPerSpace) { |
| advance += m_padding; |
| m_padding = 0; |
| } else { |
| m_padding -= m_padPerSpace; |
| advance += m_padPerSpace; |
| } |
| } |
| |
| // Account for word-spacing. |
| if (characterIndex > 0 && m_font.wordSpacing()) { |
| UChar candidateSpace; |
| if (m_run.is8Bit()) |
| candidateSpace = *(m_run.data8(characterIndex - 1)); |
| else |
| candidateSpace = *(m_run.data16(characterIndex - 1)); |
| |
| if (!FontCascade::treatAsSpace(candidateSpace)) |
| advance += m_font.wordSpacing(); |
| } |
| } |
| } |
| |
| m_runWidthSoFar += advance; |
| |
| // FIXME: We need to take the GOFFSETS for combining glyphs and store them in the glyph buffer |
| // as well, so that when the time comes to draw those glyphs, we can apply the appropriate |
| // translation. |
| if (glyphBuffer) { |
| FloatSize size(offsetX, -offsetY); |
| glyphBuffer->add(glyph, fontData, advance, GlyphBuffer::noOffset, &size); |
| } |
| |
| FloatRect glyphBounds = fontData->boundsForGlyph(glyph); |
| glyphBounds.move(m_glyphOrigin.x(), m_glyphOrigin.y()); |
| m_minGlyphBoundingBoxX = min(m_minGlyphBoundingBoxX, glyphBounds.x()); |
| m_maxGlyphBoundingBoxX = max(m_maxGlyphBoundingBoxX, glyphBounds.maxX()); |
| m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, glyphBounds.y()); |
| m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, glyphBounds.maxY()); |
| m_glyphOrigin.move(advance + offsetX, -offsetY); |
| |
| // Mutate the glyph array to contain our altered advances. |
| if (m_computingOffsetPosition) |
| advances[k] = advance; |
| } |
| |
| while (m_computingOffsetPosition && m_offsetX >= leftEdge && m_offsetX < m_runWidthSoFar) { |
| // The position is somewhere inside this run. |
| int trailing = 0; |
| HRESULT rc = ::ScriptXtoCP(m_offsetX - leftEdge, clusters.size(), glyphs.size(), clusters.data(), visualAttributes.data(), |
| advances.data(), &item.a, &m_offsetPosition, &trailing); |
| if (FAILED(rc)) { |
| WTFLogAlways("UniscribeController::shapeAndPlaceItem: ScriptXtoCP failed rc=%lx", rc); |
| return true; |
| } |
| if (trailing && m_includePartialGlyphs && m_offsetPosition < len - 1) { |
| m_offsetPosition += m_currentCharacter + m_items[i].iCharPos; |
| m_offsetX += m_run.rtl() ? -trailing : trailing; |
| } else { |
| m_computingOffsetPosition = false; |
| m_offsetPosition += m_currentCharacter + m_items[i].iCharPos; |
| if (trailing && m_includePartialGlyphs) |
| m_offsetPosition++; |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool UniscribeController::shape(const UChar* str, int len, SCRIPT_ITEM item, const Font* fontData, |
| Vector<WORD>& glyphs, Vector<WORD>& clusters, |
| Vector<SCRIPT_VISATTR>& visualAttributes) |
| { |
| HWndDC hdc; |
| HFONT oldFont = 0; |
| HRESULT shapeResult = E_PENDING; |
| int glyphCount = 0; |
| |
| if (!fontData) |
| return false; |
| |
| do { |
| shapeResult = ScriptShape(hdc, fontData->scriptCache(), 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(0); |
| HFONT hfont = fontData->platformData().hfont(); |
| oldFont = (HFONT)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; |
| } |
| |
| } |
