| /* |
| ******************************************************************************* |
| * |
| * Copyright (C) 1999-2003, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ******************************************************************************* |
| * file name: Paragraph.cpp |
| * |
| * created on: 09/06/2000 |
| * created by: Eric R. Mader |
| */ |
| |
| #include "unicode/utypes.h" |
| #include "unicode/uchar.h" |
| #include "unicode/ubidi.h" |
| |
| #include "layout/ParagraphLayout.h" |
| |
| #include "RenderingSurface.h" |
| #include "ScriptCompositeFontInstance.h" |
| |
| #include "paragraph.h" |
| #include "UnicodeReader.h" |
| #include "FontMap.h" |
| |
| #define MARGIN 10 |
| #define LINE_GROW 32 |
| |
| Paragraph::Paragraph(const LEUnicode chars[], int32_t charCount, const FontRuns *fontRuns) |
| : fParagraphLayout(NULL), fLineCount(0), fLinesMax(0), fLinesGrow(LINE_GROW), fLines(NULL), fChars(NULL), |
| fLineHeight(-1), fAscent(-1), fWidth(-1), fHeight(-1) |
| { |
| fChars = LE_NEW_ARRAY(LEUnicode, charCount); |
| LE_ARRAY_COPY(fChars, chars, charCount); |
| |
| fParagraphLayout = new ParagraphLayout(fChars, charCount, fontRuns, NULL, NULL, NULL, UBIDI_LTR, false); |
| |
| le_int32 ascent = fParagraphLayout->getAscent(); |
| le_int32 descent = fParagraphLayout->getDescent(); |
| le_int32 leading = fParagraphLayout->getLeading(); |
| |
| fLineHeight = ascent + descent + leading; |
| fAscent = ascent; |
| } |
| |
| Paragraph::~Paragraph() |
| { |
| for (le_int32 line = 0; line < fLineCount; line += 1) { |
| delete /*(LineInfo *)*/ fLines[line]; |
| } |
| |
| LE_DELETE_ARRAY(fLines); |
| delete fParagraphLayout; |
| LE_DELETE_ARRAY(fChars); |
| } |
| |
| void Paragraph::breakLines(le_int32 width, le_int32 height) |
| { |
| fHeight = height; |
| |
| // don't re-break if the width hasn't changed |
| if (fWidth == width) { |
| return; |
| } |
| |
| fWidth = width; |
| |
| float lineWidth = (float) (width - 2 * MARGIN); |
| const ParagraphLayout::Line *line; |
| le_int32 li; |
| |
| // Free the old LineInfo's... |
| for (li = 0; li < fLineCount; li += 1) { |
| delete fLines[li]; |
| } |
| |
| li = 0; |
| fParagraphLayout->reflow(); |
| while ((line = fParagraphLayout->nextLine(lineWidth)) != NULL) { |
| // grow the line array, if we need to. |
| if (li >= fLinesMax) { |
| fLines = (const ParagraphLayout::Line **) LE_GROW_ARRAY(fLines, fLinesMax + fLinesGrow); |
| fLinesMax += fLinesGrow; |
| } |
| |
| fLines[li++] = line; |
| } |
| |
| fLineCount = li; |
| } |
| |
| void Paragraph::draw(RenderingSurface *surface, le_int32 firstLine, le_int32 lastLine) |
| { |
| le_int32 li, x, y; |
| |
| x = MARGIN; |
| y = fAscent; |
| |
| for (li = firstLine; li <= lastLine; li += 1) { |
| const ParagraphLayout::Line *line = fLines[li]; |
| le_int32 runCount = line->countRuns(); |
| le_int32 run; |
| |
| for (run = 0; run < runCount; run += 1) { |
| const ParagraphLayout::VisualRun *visualRun = line->getVisualRun(run); |
| le_int32 glyphCount = visualRun->getGlyphCount(); |
| const LEFontInstance *font = visualRun->getFont(); |
| const LEGlyphID *glyphs = visualRun->getGlyphs(); |
| const float *positions = visualRun->getPositions(); |
| |
| surface->drawGlyphs(font, glyphs, glyphCount, positions, x, y, fWidth, fHeight); |
| } |
| |
| y += fLineHeight; |
| } |
| } |
| |
| Paragraph *Paragraph::paragraphFactory(const char *fileName, const LEFontInstance *font, GUISupport *guiSupport) |
| { |
| LEErrorCode fontStatus = LE_NO_ERROR; |
| UErrorCode scriptStatus = U_ZERO_ERROR; |
| le_int32 charCount; |
| const UChar *text = UnicodeReader::readFile(fileName, guiSupport, charCount); |
| Paragraph *result = NULL; |
| |
| if (text == NULL) { |
| return NULL; |
| } |
| |
| FontRuns fontRuns(0); |
| |
| fontRuns.add(font, charCount); |
| |
| result = new Paragraph(text, charCount, &fontRuns); |
| |
| LE_DELETE_ARRAY(text); |
| |
| return result; |
| } |
| |