| /* |
| * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
| * Copyright (C) 2007-2009 Torch Mobile, Inc. |
| * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) |
| * Copyright (C) 2008 Holger Hans Peter Freyther |
| * |
| * 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "Font.h" |
| |
| #include "AffineTransform.h" |
| #include "FloatRect.h" |
| #include "FontCache.h" |
| #include "FontData.h" |
| #include "FontFallbackList.h" |
| #include "GlyphBuffer.h" |
| #include "GraphicsContext.h" |
| #include "IntRect.h" |
| #include "NotImplemented.h" |
| #include "WidthIterator.h" |
| #include <wtf/MathExtras.h> |
| #include <wtf/OwnPtr.h> |
| #include <wtf/unicode/Unicode.h> |
| |
| #include <windows.h> |
| |
| using namespace WTF::Unicode; |
| |
| namespace WebCore { |
| |
| HDC g_screenDC = GetDC(0); |
| |
| class ScreenDcReleaser { |
| public: |
| ~ScreenDcReleaser() |
| { |
| ReleaseDC(0, g_screenDC); |
| } |
| }; |
| |
| ScreenDcReleaser releaseScreenDc; |
| |
| void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* fontData, const GlyphBuffer& glyphBuffer, |
| int from, int numGlyphs, const FloatPoint& point) const |
| { |
| graphicsContext->drawText(fontData, glyphBuffer, from, numGlyphs, point); |
| } |
| |
| class TextRunComponent { |
| public: |
| TextRunComponent() : m_textRun(0, 0) {} |
| TextRunComponent(const UChar *start, int length, const TextRun& parentTextRun, const Font &font, int offset); |
| TextRunComponent(int spaces, const Font &font, int offset); |
| ~TextRunComponent() { m_textRun; } |
| |
| bool isSpace() const { return m_spaces; } |
| int textLength() const { return m_spaces ? m_spaces : m_textRun.length(); } |
| |
| TextRun m_textRun; |
| float m_width; |
| int m_offset; |
| int m_spaces; |
| }; |
| |
| TextRunComponent::TextRunComponent(const UChar *start, int length, const TextRun& parentTextRun, const Font &font, int o) |
| : m_textRun(start, length, parentTextRun.allowTabs(), 0, 0 |
| , parentTextRun.rtl() |
| , parentTextRun.directionalOverride() |
| , parentTextRun.applyRunRounding() |
| , parentTextRun.applyWordRounding()) |
| , m_offset(o) |
| , m_spaces(0) |
| { |
| WidthIterator it(&font, m_textRun); |
| it.advance(m_textRun.length(), 0); |
| m_width = it.m_runWidthSoFar; |
| } |
| |
| TextRunComponent::TextRunComponent(int s, const Font &font, int o) |
| : m_textRun(0, 0) |
| , m_offset(o) |
| , m_spaces(s) |
| { |
| m_width = s * font.primaryFont()->widthForGlyph(' '); |
| } |
| |
| typedef Vector<TextRunComponent, 128> TextRunComponents; |
| |
| static int generateComponents(TextRunComponents* components, const Font &font, const TextRun &run) |
| { |
| int letterSpacing = font.letterSpacing(); |
| int wordSpacing = font.wordSpacing(); |
| int padding = run.padding(); |
| int numSpaces = 0; |
| if (padding) { |
| for (int i = 0; i < run.length(); i++) |
| if (Font::treatAsSpace(run[i])) |
| ++numSpaces; |
| } |
| |
| int offset = 0; |
| if (letterSpacing) { |
| // need to draw every letter on it's own |
| int start = 0; |
| if (Font::treatAsSpace(run[0])) { |
| int add = 0; |
| if (numSpaces) { |
| add = padding/numSpaces; |
| padding -= add; |
| --numSpaces; |
| } |
| components->append(TextRunComponent(1, font, offset)); |
| offset += add + letterSpacing + components->last().m_width; |
| start = 1; |
| } |
| for (int i = 1; i < run.length(); ++i) { |
| uint ch = run[i]; |
| if (isHighSurrogate(ch) && isLowSurrogate(run[i-1])) |
| ch = surrogateToUcs4(ch, run[i-1]); |
| if (isLowSurrogate(ch) || category(ch) == Mark_NonSpacing) |
| continue; |
| if (Font::treatAsSpace(run[i])) { |
| int add = 0; |
| if (i - start > 0) { |
| components->append(TextRunComponent(run.characters() + start, i - start, |
| run, font, offset)); |
| offset += components->last().m_width + letterSpacing; |
| } |
| if (numSpaces) { |
| add = padding/numSpaces; |
| padding -= add; |
| --numSpaces; |
| } |
| components->append(TextRunComponent(1, font, offset)); |
| offset += wordSpacing + add + components->last().m_width + letterSpacing; |
| start = i + 1; |
| continue; |
| } |
| if (i - start > 0) { |
| components->append(TextRunComponent(run.characters() + start, i - start, |
| run, |
| font, offset)); |
| offset += components->last().m_width + letterSpacing; |
| } |
| start = i; |
| } |
| if (run.length() - start > 0) { |
| components->append(TextRunComponent(run.characters() + start, run.length() - start, |
| run, |
| font, offset)); |
| offset += components->last().m_width; |
| } |
| offset += letterSpacing; |
| } else { |
| int start = 0; |
| for (int i = 0; i < run.length(); ++i) { |
| if (Font::treatAsSpace(run[i])) { |
| if (i - start > 0) { |
| components->append(TextRunComponent(run.characters() + start, i - start, |
| run, |
| font, offset)); |
| offset += components->last().m_width; |
| } |
| int add = 0; |
| if (numSpaces) { |
| add = padding/numSpaces; |
| padding -= add; |
| --numSpaces; |
| } |
| components->append(TextRunComponent(1, font, offset)); |
| offset += add + components->last().m_width; |
| if (i) |
| offset += wordSpacing; |
| start = i + 1; |
| } |
| } |
| if (run.length() - start > 0) { |
| components->append(TextRunComponent(run.characters() + start, run.length() - start, |
| run, |
| font, offset)); |
| offset += components->last().m_width; |
| } |
| } |
| return offset; |
| } |
| |
| void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, |
| int from, int to) const |
| { |
| if (to < 0) |
| to = run.length(); |
| if (from < 0) |
| from = 0; |
| |
| TextRunComponents components; |
| int w = generateComponents(&components, *this, run); |
| |
| int curPos = 0; |
| for (int i = 0; i < (int)components.size(); ++i) { |
| const TextRunComponent& comp = components.at(i); |
| int len = comp.textLength(); |
| int curEnd = curPos + len; |
| if (curPos < to && from < curEnd && !comp.isSpace()) { |
| FloatPoint pt = point; |
| if (run.rtl()) |
| pt.setX(point.x() + w - comp.m_offset - comp.m_width); |
| else |
| pt.setX(point.x() + comp.m_offset); |
| drawSimpleText(context, comp.m_textRun, pt, from - curPos, std::min(to, curEnd) - curPos); |
| } |
| curPos += len; |
| if (from < curPos) |
| from = curPos; |
| } |
| } |
| |
| float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts) const |
| { |
| TextRunComponents components; |
| int w = generateComponents(&components, *this, run); |
| return w; |
| } |
| |
| int Font::offsetForPositionForComplexText(const TextRun& run, int position, bool includePartialGlyphs) const |
| { |
| TextRunComponents components; |
| int w = generateComponents(&components, *this, run); |
| |
| if (position >= w) |
| return run.length(); |
| |
| int offset = 0; |
| if (run.rtl()) { |
| for (size_t i = 0; i < components.size(); ++i) { |
| const TextRunComponent& comp = components.at(i); |
| int xe = w - comp.m_offset; |
| int xs = xe - comp.m_width; |
| if (position >= xs) |
| return offset + (comp.isSpace() |
| ? static_cast<int>((position - xe) * comp.m_spaces / std::max(1.f, comp.m_width) + 0.5) |
| : offsetForPositionForSimpleText(comp.m_textRun, position - xs, includePartialGlyphs)); |
| |
| offset += comp.textLength(); |
| } |
| } else { |
| for (size_t i = 0; i < components.size(); ++i) { |
| const TextRunComponent& comp = components.at(i); |
| int xs = comp.m_offset; |
| int xe = xs + comp.m_width; |
| if (position <= xe) { |
| if (position - xs >= xe) |
| return offset + comp.textLength(); |
| return offset + (comp.isSpace() |
| ? static_cast<int>((position - xs) * comp.m_spaces / std::max(1.f, comp.m_width) + 0.5) |
| : offsetForPositionForSimpleText(comp.m_textRun, position - xs, includePartialGlyphs)); |
| } |
| offset += comp.textLength(); |
| } |
| } |
| return run.length(); |
| } |
| |
| |
| static float cursorToX(const Font* font, const TextRunComponents& components, int width, bool rtl, int cursor) |
| { |
| int start = 0; |
| for (size_t i = 0; i < components.size(); ++i) { |
| const TextRunComponent& comp = components.at(i); |
| if (start + comp.textLength() <= cursor) { |
| start += comp.textLength(); |
| continue; |
| } |
| int xs = comp.m_offset; |
| if (rtl) |
| xs = width - xs - comp.m_width; |
| |
| int pos = cursor - start; |
| if (comp.isSpace()) { |
| if (rtl) |
| pos = comp.textLength() - pos; |
| return xs + pos * comp.m_width / comp.m_spaces; |
| } |
| WidthIterator it(font, comp.m_textRun); |
| it.advance(pos); |
| return xs + it.m_runWidthSoFar; |
| } |
| return width; |
| } |
| |
| FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& pt, |
| int h, int from, int to) const |
| { |
| TextRunComponents components; |
| int w = generateComponents(&components, *this, run); |
| |
| if (!from && to == run.length()) |
| return FloatRect(pt.x(), pt.y(), w, h); |
| |
| float x1 = cursorToX(this, components, w, run.rtl(), from); |
| float x2 = cursorToX(this, components, w, run.rtl(), to); |
| if (x2 < x1) |
| std::swap(x1, x2); |
| |
| return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h); |
| } |
| |
| bool Font::canReturnFallbackFontsForComplexText() |
| { |
| return false; |
| } |
| |
| } |
