diff options
Diffstat (limited to 'Build/source/libs/icu-xetex/samples/layout/paragraph.cpp')
-rw-r--r-- | Build/source/libs/icu-xetex/samples/layout/paragraph.cpp | 192 |
1 files changed, 155 insertions, 37 deletions
diff --git a/Build/source/libs/icu-xetex/samples/layout/paragraph.cpp b/Build/source/libs/icu-xetex/samples/layout/paragraph.cpp index 2ac4504ed6d..315ca04a4b7 100644 --- a/Build/source/libs/icu-xetex/samples/layout/paragraph.cpp +++ b/Build/source/libs/icu-xetex/samples/layout/paragraph.cpp @@ -1,7 +1,7 @@ /* ******************************************************************************* * - * Copyright (C) 1999-2003, International Business Machines + * Copyright (C) 1999-2005, International Business Machines * Corporation and others. All Rights Reserved. * ******************************************************************************* @@ -14,6 +14,7 @@ #include "unicode/utypes.h" #include "unicode/uchar.h" #include "unicode/ubidi.h" +#include "unicode/ustring.h" #include "layout/ParagraphLayout.h" @@ -26,29 +27,133 @@ #define MARGIN 10 #define LINE_GROW 32 +#define PARA_GROW 8 + +#define CH_LF 0x000A +#define CH_CR 0x000D +#define CH_LSEP 0x2028 +#define CH_PSEP 0x2029 + +static LEUnicode *skipLineEnd(LEUnicode *ptr) +{ + if (ptr[0] == CH_CR && ptr[1] == CH_LF) { + ptr += 1; + } + + return ptr + 1; +} + +static le_int32 findRun(const RunArray *runArray, le_int32 offset) +{ + le_int32 runCount = runArray->getCount(); + + for (le_int32 run = 0; run < runCount; run += 1) { + if (runArray->getLimit(run) > offset) { + return run; + } + } + + return -1; +} + +static void subsetFontRuns(const FontRuns *fontRuns, le_int32 start, le_int32 limit, FontRuns *sub) +{ + le_int32 startRun = findRun(fontRuns, start); + le_int32 endRun = findRun(fontRuns, limit - 1); + + sub->reset(); + + for (le_int32 run = startRun; run <= endRun; run += 1) { + const LEFontInstance *runFont = fontRuns->getFont(run); + le_int32 runLimit = fontRuns->getLimit(run) - start; + + if (run == endRun) { + runLimit = limit - start; + } + + sub->add(runFont, runLimit); + } +} 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) + : fParagraphLayout(NULL), fParagraphCount(0), fParagraphMax(PARA_GROW), fParagraphGrow(PARA_GROW), + fLineCount(0), fLinesMax(LINE_GROW), fLinesGrow(LINE_GROW), fLines(NULL), fChars(NULL), + fLineHeight(-1), fAscent(-1), fWidth(-1), fHeight(-1), fParagraphLevel(UBIDI_DEFAULT_LTR) { + static const LEUnicode separators[] = {CH_LF, CH_CR, CH_LSEP, CH_PSEP}; + if (LE_FAILURE(status)) { return; } + le_int32 ascent = 0; + le_int32 descent = 0; + le_int32 leading = 0; + LocaleRuns *locales = NULL; + FontRuns fr(0); + + fLines = LE_NEW_ARRAY(const ParagraphLayout::Line *, fLinesMax); + fParagraphLayout = LE_NEW_ARRAY(ParagraphLayout *, fParagraphMax); - fChars = LE_NEW_ARRAY(LEUnicode, charCount); + fChars = LE_NEW_ARRAY(LEUnicode, charCount + 1); LE_ARRAY_COPY(fChars, chars, charCount); + fChars[charCount] = 0; - fParagraphLayout = new ParagraphLayout(fChars, charCount, fontRuns, NULL, NULL, locales, UBIDI_DEFAULT_LTR, FALSE, status); + LEUnicode *pStart = &fChars[0]; - if (LE_FAILURE(status)) { - return; - } + while (*pStart != 0) { + LEUnicode *pEnd = u_strpbrk(pStart, separators); + le_int32 pAscent, pDescent, pLeading; + ParagraphLayout *paragraphLayout = NULL; - le_int32 ascent = fParagraphLayout->getAscent(); - le_int32 descent = fParagraphLayout->getDescent(); - le_int32 leading = fParagraphLayout->getLeading(); + if (pEnd == NULL) { + pEnd = &fChars[charCount]; + } + + if (pEnd != pStart) { + subsetFontRuns(fontRuns, pStart - fChars, pEnd - fChars, &fr); + + paragraphLayout = new ParagraphLayout(pStart, pEnd - pStart, &fr, NULL, NULL, locales, fParagraphLevel, FALSE, status); + + if (LE_FAILURE(status)) { + break; // return? something else? + } + + if (fParagraphLevel == UBIDI_DEFAULT_LTR) { + fParagraphLevel = paragraphLayout->getParagraphLevel(); + } + + pAscent = paragraphLayout->getAscent(); + pDescent = paragraphLayout->getDescent(); + pLeading = paragraphLayout->getLeading(); + + if (pAscent > ascent) { + ascent = pAscent; + } + + if (pDescent > descent) { + descent = pDescent; + } + + if (pLeading > leading) { + leading = pLeading; + } + } + + if (fParagraphCount >= fParagraphMax) { + fParagraphLayout = (ParagraphLayout **) LE_GROW_ARRAY(fParagraphLayout, fParagraphMax + fParagraphGrow); + fParagraphMax += fParagraphGrow; + } + + fParagraphLayout[fParagraphCount++] = paragraphLayout; + + if (*pEnd == 0) { + break; + } + + pStart = skipLineEnd(pEnd); + } fLineHeight = ascent + descent + leading; fAscent = ascent; @@ -65,6 +170,16 @@ Paragraph::~Paragraph() LE_DELETE_ARRAY(fChars); } +void Paragraph::addLine(const ParagraphLayout::Line *line) +{ + if (fLineCount >= fLinesMax) { + fLines = (const ParagraphLayout::Line **) LE_GROW_ARRAY(fLines, fLinesMax + fLinesGrow); + fLinesMax += fLinesGrow; + } + + fLines[fLineCount++] = line; +} + void Paragraph::breakLines(le_int32 width, le_int32 height) { fHeight = height; @@ -78,26 +193,26 @@ void Paragraph::breakLines(le_int32 width, le_int32 height) 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) { + for (le_int32 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; - } + fLineCount = 0; - fLines[li++] = line; - } + for (le_int32 p = 0; p < fParagraphCount; p += 1) { + ParagraphLayout *paragraphLayout = fParagraphLayout[p]; - fLineCount = li; + if (paragraphLayout != NULL) { + paragraphLayout->reflow(); + while ((line = paragraphLayout->nextLine(lineWidth)) != NULL) { + addLine(line); + } + } else { + addLine(NULL); + } + } } void Paragraph::draw(RenderingSurface *surface, le_int32 firstLine, le_int32 lastLine) @@ -109,24 +224,27 @@ void Paragraph::draw(RenderingSurface *surface, le_int32 firstLine, le_int32 las 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(); + if (line != NULL) { + le_int32 runCount = line->countRuns(); + le_int32 run; + + if (fParagraphLevel == UBIDI_RTL) { + le_int32 lastX = line->getWidth(); - x = (fWidth - lastX - MARGIN); - } + 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(); + 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); + surface->drawGlyphs(font, glyphs, glyphCount, positions, x, y, fWidth, fHeight); + } } y += fLineHeight; |