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/*
*******************************************************************************
*
* 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, LEErrorCode &status)
: fParagraphLayout(NULL), fLineCount(0), fLinesMax(0), fLinesGrow(LINE_GROW), fLines(NULL), fChars(NULL),
fLineHeight(-1), fAscent(-1), fWidth(-1), fHeight(-1)
{
if (LE_FAILURE(status)) {
return;
}
LocaleRuns *locales = NULL;
fChars = LE_NEW_ARRAY(LEUnicode, charCount);
LE_ARRAY_COPY(fChars, chars, charCount);
fParagraphLayout = new ParagraphLayout(fChars, charCount, fontRuns, NULL, NULL, locales, UBIDI_DEFAULT_LTR, FALSE, status);
if (LE_FAILURE(status)) {
return;
}
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;
if (fParagraphLayout->getParagraphLevel() == UBIDI_RTL) {
le_int32 lastX = line->getWidth();
x = (fWidth - lastX - MARGIN);
}
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 status = LE_NO_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, status);
if (LE_FAILURE(status)) {
delete result;
result = NULL;
}
LE_DELETE_ARRAY(text);
return result;
}
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