Edit
kc3-lang/ftgl/src/FTLayout/FTSimpleLayout.cpp
Frank Heckenbach
- src/FTLayout/FTSimpleLayout.cpp
-
/* * FTGL - OpenGL font library * * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz> * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net> * Copyright (c) 2008 Daniel Remenak <dtremenak@users.sourceforge.net> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "config.h" #include <ctype.h> #include <wctype.h> #include "FTInternals.h" #include "FTUnicode.h" #include "FTGlyphContainer.h" #include "FTSimpleLayoutImpl.h" // // FTSimpleLayout // FTSimpleLayout::FTSimpleLayout() : FTLayout(new FTSimpleLayoutImpl()) {} FTSimpleLayout::~FTSimpleLayout() {} FTBBox FTSimpleLayout::BBox(const char *string, const int len, FTPoint pos) { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->BBox(string, len, pos); } FTBBox FTSimpleLayout::BBox(const wchar_t *string, const int len, FTPoint pos) { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->BBox(string, len, pos); } void FTSimpleLayout::Render(const char *string, const int len, FTPoint pos, int renderMode) { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->Render(string, len, pos, renderMode); } void FTSimpleLayout::Render(const wchar_t* string, const int len, FTPoint pos, int renderMode) { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->Render(string, len, pos, renderMode); } void FTSimpleLayout::SetFont(FTFont *fontInit) { dynamic_cast<FTSimpleLayoutImpl*>(impl)->currentFont = fontInit; } FTFont *FTSimpleLayout::GetFont() { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->currentFont; } void FTSimpleLayout::SetLineLength(const float LineLength) { dynamic_cast<FTSimpleLayoutImpl*>(impl)->lineLength = LineLength; } float FTSimpleLayout::GetLineLength() const { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->lineLength; } void FTSimpleLayout::SetAlignment(const FTGL::TextAlignment Alignment) { dynamic_cast<FTSimpleLayoutImpl*>(impl)->alignment = Alignment; } FTGL::TextAlignment FTSimpleLayout::GetAlignment() const { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->alignment; } void FTSimpleLayout::SetLineSpacing(const float LineSpacing) { dynamic_cast<FTSimpleLayoutImpl*>(impl)->lineSpacing = LineSpacing; } float FTSimpleLayout::GetLineSpacing() const { return dynamic_cast<FTSimpleLayoutImpl*>(impl)->lineSpacing; } // // FTSimpleLayoutImpl // FTSimpleLayoutImpl::FTSimpleLayoutImpl() { currentFont = NULL; lineLength = 100.0f; alignment = FTGL::ALIGN_LEFT; lineSpacing = 1.0f; } template <typename T> inline FTBBox FTSimpleLayoutImpl::BBoxI(const T* string, const int len, FTPoint position) { FTBBox tmp; WrapText(string, len, position, 0, &tmp); return tmp; } FTBBox FTSimpleLayoutImpl::BBox(const char *string, const int len, FTPoint position) { return BBoxI(string, len, position); } FTBBox FTSimpleLayoutImpl::BBox(const wchar_t *string, const int len, FTPoint position) { return BBoxI(string, len, position); } template <typename T> inline void FTSimpleLayoutImpl::RenderI(const T *string, const int len, FTPoint position, int renderMode) { pen = FTPoint(0.0f, 0.0f); WrapText(string, len, position, renderMode, NULL); } void FTSimpleLayoutImpl::Render(const char *string, const int len, FTPoint position, int renderMode) { RenderI(string, len, position, renderMode); } void FTSimpleLayoutImpl::Render(const wchar_t* string, const int len, FTPoint position, int renderMode) { RenderI(string, len, position, renderMode); } template <typename T> inline void FTSimpleLayoutImpl::WrapTextI(const T *buf, const int /*len*/, FTPoint position, int renderMode, FTBBox *bounds) { FTUnicodeStringItr<T> breakItr(buf); // points to the last break character FTUnicodeStringItr<T> lineStart(buf); // points to the line start float nextStart = 0.0; // total width of the current line float breakWidth = 0.0; // width of the line up to the last word break float currentWidth = 0.0; // width of all characters on the current line float prevWidth; // width of all characters but the current glyph float wordLength = 0.0; // length of the block since the last break char int charCount = 0; // number of characters so far on the line int breakCharCount = 0; // number of characters before the breakItr float glyphWidth, advance; FTBBox glyphBounds; // Reset the pen position pen.Y(0); // If we have bounds mark them invalid if(bounds) { bounds->Invalidate(); } // Scan the input for all characters that need output FTUnicodeStringItr<T> prevItr(buf); for (FTUnicodeStringItr<T> itr(buf); *itr; prevItr = itr++, charCount++) { // Find the width of the current glyph glyphBounds = currentFont->BBox(itr.getBufferFromHere(), 1); glyphWidth = glyphBounds.Upper().Xf() - glyphBounds.Lower().Xf(); advance = currentFont->Advance(itr.getBufferFromHere(), 1); prevWidth = currentWidth; // Compute the width of all glyphs up to the end of buf[i] currentWidth = nextStart + glyphWidth; // Compute the position of the next glyph nextStart += advance; // See if the current character is a space, a break or a regular character if((currentWidth > lineLength) || (*itr == '\n')) { // A non whitespace character has exceeded the line length. Or a // newline character has forced a line break. Output the last // line and start a new line after the break character. // If we have not yet found a break, break on the last character if(breakItr == lineStart || (*itr == '\n')) { // Break on the previous character breakItr = prevItr; breakCharCount = charCount - 1; breakWidth = prevWidth; // None of the previous words will be carried to the next line wordLength = 0; // If the current character is a newline discard its advance if(*itr == '\n') advance = 0; } float remainingWidth = lineLength - breakWidth; // Render the current substring FTUnicodeStringItr<T> breakChar = breakItr; // move past the break character and don't count it on the next line either ++breakChar; --charCount; // If the break character is a newline do not render it if(*breakChar == '\n') { ++breakChar; --charCount; } if(breakCharCount >= 0) { OutputWrapped(lineStart.getBufferFromHere(), breakCharCount, //breakItr.getBufferFromHere() - lineStart.getBufferFromHere(), position, renderMode, remainingWidth, bounds); } // Store the start of the next line lineStart = breakChar; // TODO: Is Height() the right value here? pen -= FTPoint(0, currentFont->LineHeight() * lineSpacing); // The current width is the width since the last break nextStart = wordLength + advance; wordLength += advance; currentWidth = wordLength + advance; // Reset the safe break for the next line breakItr = lineStart; charCount -= breakCharCount; } else if(iswspace(*itr)) { // This is the last word break position wordLength = 0; breakItr = itr; breakCharCount = charCount; // Check to see if this is the first whitespace character in a run if(buf == itr.getBufferFromHere() || !iswspace(*prevItr)) { // Record the width of the start of the block breakWidth = currentWidth; } } else { wordLength += advance; } } float remainingWidth = lineLength - currentWidth; // Render any remaining text on the last line // Disable justification for the last row if(alignment == FTGL::ALIGN_JUSTIFY) { alignment = FTGL::ALIGN_LEFT; OutputWrapped(lineStart.getBufferFromHere(), -1, position, renderMode, remainingWidth, bounds); alignment = FTGL::ALIGN_JUSTIFY; } else { OutputWrapped(lineStart.getBufferFromHere(), -1, position, renderMode, remainingWidth, bounds); } } void FTSimpleLayoutImpl::WrapText(const char *buf, const int len, FTPoint position, int renderMode, FTBBox *bounds) { WrapTextI(buf, len, position, renderMode, bounds); } void FTSimpleLayoutImpl::WrapText(const wchar_t* buf, const int len, FTPoint position, int renderMode, FTBBox *bounds) { WrapTextI(buf, len, position, renderMode, bounds); } template <typename T> inline void FTSimpleLayoutImpl::OutputWrappedI(const T *buf, const int len, FTPoint position, int renderMode, const float remaining, FTBBox *bounds) { float distributeWidth = 0.0; // Align the text according as specified by Alignment switch (alignment) { case FTGL::ALIGN_LEFT: pen.X(0); break; case FTGL::ALIGN_CENTER: pen.X(remaining / 2); break; case FTGL::ALIGN_RIGHT: pen.X(remaining); break; case FTGL::ALIGN_JUSTIFY: pen.X(0); distributeWidth = remaining; break; } // If we have bounds expand them by the line's bounds, otherwise render // the line. if(bounds) { FTBBox temp = currentFont->BBox(buf, len); // Add the extra space to the upper x dimension temp = FTBBox(temp.Lower() + pen, temp.Upper() + pen + FTPoint(distributeWidth, 0)); // See if this is the first area to be added to the bounds if(bounds->IsValid()) { *bounds |= temp; } else { *bounds = temp; } } else { RenderSpace(buf, len, position, renderMode, distributeWidth); } } void FTSimpleLayoutImpl::OutputWrapped(const char *buf, const int len, FTPoint position, int renderMode, const float remaining, FTBBox *bounds) { OutputWrappedI(buf, len, position, renderMode, remaining, bounds); } void FTSimpleLayoutImpl::OutputWrapped(const wchar_t *buf, const int len, FTPoint position, int renderMode, const float remaining, FTBBox *bounds) { OutputWrappedI(buf, len, position, renderMode, remaining, bounds); } template <typename T> inline void FTSimpleLayoutImpl::RenderSpaceI(const T *string, const int len, FTPoint position, int renderMode, const float extraSpace) { (void)position; float space = 0.0; // If there is space to distribute, count the number of spaces if(extraSpace > 0.0) { int numSpaces = 0; // Count the number of space blocks in the input FTUnicodeStringItr<T> prevItr(string), itr(string); for(int i = 0; ((len < 0) && *itr) || ((len >= 0) && (i <= len)); ++i, prevItr = itr++) { // If this is the end of a space block, increment the counter if((i > 0) && !iswspace(*itr) && iswspace(*prevItr)) { numSpaces++; } } space = extraSpace/numSpaces; } // Output all characters of the string FTUnicodeStringItr<T> prevItr(string), itr(string); for(int i = 0; ((len < 0) && *itr) || ((len >= 0) && (i <= len)); ++i, prevItr = itr++) { // If this is the end of a space block, distribute the extra space // inside it if((i > 0) && !iswspace(*itr) && iswspace(*prevItr)) { pen += FTPoint(space, 0); } pen = currentFont->Render(itr.getBufferFromHere(), 1, pen, FTPoint(), renderMode); } } void FTSimpleLayoutImpl::RenderSpace(const char *string, const int len, FTPoint position, int renderMode, const float extraSpace) { RenderSpaceI(string, len, position, renderMode, extraSpace); } void FTSimpleLayoutImpl::RenderSpace(const wchar_t *string, const int len, FTPoint position, int renderMode, const float extraSpace) { RenderSpaceI(string, len, position, renderMode, extraSpace); }