Viewing file:  pflow.c (9.28 KB) -rw-r--r--
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/*
*
* © 2016 and later: Unicode, Inc. and others.
* License & terms of use: http://www.unicode.org/copyright.html
*
* (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved
*
*/
#include <stdbool.h>
#include "unicode/utypes.h"
#include "unicode/uchar.h"
#include "unicode/ubidi.h"
#include "unicode/ustring.h"
#include "layout/LETypes.h"
#include "layout/loengine.h"
#include "layout/playout.h"
#include "layout/plruns.h"
#include "pflow.h"
#include "arraymem.h"
#include "ucreader.h"
/*
* Move the line below out of this comment
* to add a locale run to the pl_paragraphs
* that are created.
#define TEST_LOCALE "zh_TW"
*/
#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
struct pf_object
{
pl_paragraph **fParagraphLayout;
le_int32 fParagraphCount;
le_int32 fParagraphMax;
le_int32 fParagraphGrow;
le_int32 fLineCount;
le_int32 fLinesMax;
le_int32 fLinesGrow;
pl_line **fLines;
LEUnicode *fChars;
le_int32 fLineHeight;
le_int32 fAscent;
le_int32 fWidth;
le_int32 fHeight;
UBiDiLevel fParagraphLevel;
};
typedef struct pf_object pf_object;
static LEUnicode *skipLineEnd(LEUnicode *ptr)
{
if (ptr[0] == CH_CR && ptr[1] == CH_LF) {
ptr += 1;
}
return ptr + 1;
}
static le_int32 findFontRun(const pl_fontRuns *fontRuns, le_int32 offset)
{
le_int32 runCount = pl_getFontRunCount(fontRuns);
le_int32 run;
for (run = 0; run < runCount; run += 1) {
if (pl_getFontRunLimit(fontRuns, run) > offset) {
return run;
}
}
return -1;
}
static void subsetFontRuns(const pl_fontRuns *fontRuns, le_int32 start, le_int32 limit, pl_fontRuns *sub)
{
le_int32 startRun = findFontRun(fontRuns, start);
le_int32 endRun = findFontRun(fontRuns, limit - 1);
le_int32 run;
pl_resetFontRuns(sub);
for (run = startRun; run <= endRun; run += 1) {
const le_font *runFont = pl_getFontRunFont(fontRuns, run);
le_int32 runLimit = pl_getFontRunLimit(fontRuns, run) - start;
if (run == endRun) {
runLimit = limit - start;
}
pl_addFontRun(sub, runFont, runLimit);
}
}
pf_flow *pf_create(const LEUnicode chars[], le_int32 charCount, const pl_fontRuns *fontRuns, LEErrorCode *status)
{
pf_object *flow;
le_int32 ascent = 0;
le_int32 descent = 0;
le_int32 leading = 0;
pl_localeRuns *locales = NULL;
pl_fontRuns *fr;
LEUnicode *pStart;
static const LEUnicode separators[] = {CH_LF, CH_CR, CH_LSEP, CH_PSEP, 0x0000};
if (LE_FAILURE(*status)) {
return NULL;
}
flow = NEW_ARRAY(pf_object, 1);
flow->fParagraphLayout = NULL;
flow->fParagraphCount = 0;
flow->fParagraphMax = PARA_GROW;
flow->fParagraphGrow = PARA_GROW;
flow->fLineCount = 0;
flow->fLinesMax = LINE_GROW;
flow->fLinesGrow = LINE_GROW;
flow->fLines = NULL;
flow->fChars = NULL;
flow->fLineHeight = -1;
flow->fAscent = -1;
flow->fWidth = -1;
flow->fHeight = -1;
flow->fParagraphLevel = UBIDI_DEFAULT_LTR;
fr = pl_openEmptyFontRuns(0);
#ifdef TEST_LOCALE
locales = pl_openEmptyLocaleRuns(0);
#endif
flow->fLines = NEW_ARRAY(pl_line *, flow->fLinesMax);
flow->fParagraphLayout = NEW_ARRAY(pl_paragraph *, flow->fParagraphMax);
flow->fChars = NEW_ARRAY(LEUnicode, charCount + 1);
LE_ARRAY_COPY(flow->fChars, chars, charCount);
flow->fChars[charCount] = 0;
pStart = &flow->fChars[0];
while (*pStart != 0) {
LEUnicode *pEnd = u_strpbrk(pStart, separators);
le_int32 pAscent, pDescent, pLeading;
pl_paragraph *paragraphLayout = NULL;
if (pEnd == NULL) {
pEnd = &flow->fChars[charCount];
}
if (pEnd != pStart) {
subsetFontRuns(fontRuns, pStart - flow->fChars, pEnd - flow->fChars, fr);
#ifdef TEST_LOCALE
pl_resetLocaleRuns(locales);
pl_addLocaleRun(locales, TEST_LOCALE, pEnd - pStart);
#endif
paragraphLayout = pl_create(pStart, pEnd - pStart, fr, NULL, NULL, locales, flow->fParagraphLevel, false, status);
if (LE_FAILURE(*status)) {
break; /* return? something else? */
}
if (flow->fParagraphLevel == UBIDI_DEFAULT_LTR) {
flow->fParagraphLevel = pl_getParagraphLevel(paragraphLayout);
}
pAscent = pl_getAscent(paragraphLayout);
pDescent = pl_getDescent(paragraphLayout);
pLeading = pl_getLeading(paragraphLayout);
if (pAscent > ascent) {
ascent = pAscent;
}
if (pDescent > descent) {
descent = pDescent;
}
if (pLeading > leading) {
leading = pLeading;
}
}
if (flow->fParagraphCount >= flow->fParagraphMax) {
flow->fParagraphLayout = (pl_paragraph **) GROW_ARRAY(flow->fParagraphLayout, flow->fParagraphMax + flow->fParagraphGrow);
flow->fParagraphMax += flow->fParagraphGrow;
}
flow->fParagraphLayout[flow->fParagraphCount++] = paragraphLayout;
if (*pEnd == 0) {
break;
}
pStart = skipLineEnd(pEnd);
}
flow->fLineHeight = ascent + descent + leading;
flow->fAscent = ascent;
pl_closeLocaleRuns(locales);
pl_closeFontRuns(fr);
return (pf_flow *) flow;
}
void pf_close(pf_flow *flow)
{
pf_object *obj = (pf_object *) flow;
le_int32 i;
for (i = 0; i < obj->fLineCount; i += 1) {
DELETE_ARRAY(obj->fLines[i]);
}
DELETE_ARRAY(obj->fLines);
for (i = 0; i < obj->fParagraphCount; i += 1) {
pl_close(obj->fParagraphLayout[i]);
}
DELETE_ARRAY(obj->fParagraphLayout);
DELETE_ARRAY(obj->fChars);
DELETE_ARRAY(obj);
}
le_int32 pf_getAscent(pf_flow *flow)
{
pf_object *obj = (pf_object *) flow;
return obj->fAscent;
}
le_int32 pf_getLineHeight(pf_flow *flow)
{
pf_object *obj = (pf_object *) flow;
return obj->fLineHeight;
}
le_int32 pf_getLineCount(pf_flow *flow)
{
pf_object *obj = (pf_object *) flow;
return obj->fLineCount;
}
static void addLine(pf_object *obj, pl_line *line)
{
if (obj->fLineCount >= obj->fLinesMax) {
obj->fLines = (pl_line **) GROW_ARRAY(obj->fLines, obj->fLinesMax + obj->fLinesGrow);
obj->fLinesMax += obj->fLinesGrow;
}
obj->fLines[obj->fLineCount++] = line;
}
void pf_breakLines(pf_flow *flow, le_int32 width, le_int32 height)
{
pf_object *obj = (pf_object *) flow;
le_int32 li, p;
float lineWidth;
pl_line *line;
obj->fHeight = height;
/* don't re-break if the width hasn't changed */
if (obj->fWidth == width) {
return;
}
obj->fWidth = width;
lineWidth = (float) (width - 2 * MARGIN);
/* Free the old Lines... */
for (li = 0; li < obj->fLineCount; li += 1) {
pl_closeLine(obj->fLines[li]);
}
obj->fLineCount = 0;
for (p = 0; p < obj->fParagraphCount; p += 1) {
pl_paragraph *paragraphLayout = obj->fParagraphLayout[p];
if (paragraphLayout != NULL) {
pl_reflow(paragraphLayout);
while ((line = pl_nextLine(paragraphLayout, lineWidth)) != NULL) {
addLine(obj, line);
}
} else {
addLine(obj, NULL);
}
}
}
void pf_draw(pf_flow *flow, rs_surface *surface, le_int32 firstLine, le_int32 lastLine)
{
pf_object *obj = (pf_object *) flow;
le_int32 li, x, y;
x = MARGIN;
y = obj->fAscent;
for (li = firstLine; li <= lastLine; li += 1) {
const pl_line *line = obj->fLines[li];
if (line != NULL) {
le_int32 runCount = pl_countLineRuns(line);
le_int32 run;
if (obj->fParagraphLevel == UBIDI_RTL) {
le_int32 lastX = pl_getLineWidth(line);
x = (obj->fWidth - lastX - MARGIN);
}
for (run = 0; run < runCount; run += 1) {
const pl_visualRun *visualRun = pl_getLineVisualRun(line, run);
le_int32 glyphCount = pl_getVisualRunGlyphCount(visualRun);
const le_font *font = pl_getVisualRunFont(visualRun);
const LEGlyphID *glyphs = pl_getVisualRunGlyphs(visualRun);
const float *positions = pl_getVisualRunPositions(visualRun);
rs_drawGlyphs(surface, font, glyphs, glyphCount, positions, x, y, obj->fWidth, obj->fHeight);
}
}
y += obj->fLineHeight;
}
}
pf_flow *pf_factory(const char *fileName, const le_font *font, gs_guiSupport *guiSupport)
{
LEErrorCode status = LE_NO_ERROR;
le_int32 charCount;
const UChar *text = uc_readFile(fileName, guiSupport, &charCount);
pl_fontRuns *fontRuns;
pf_flow *result = NULL;
if (text == NULL) {
return NULL;
}
fontRuns = pl_openEmptyFontRuns(0);
pl_addFontRun(fontRuns, font, charCount);
result = pf_create(text, charCount, fontRuns, &status);
if (LE_FAILURE(status)) {
pf_close(result);
result = NULL;
}
pl_closeFontRuns(fontRuns);
DELETE_ARRAY(text);
return result;
}
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