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