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pflow.c

/*
 *
 * © 2016 and later: Unicode, Inc. and others.
 * License & terms of use: http://www.unicode.org/copyright.html#License
 *
 * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved
 *
 */

#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;    
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-03-06 10:54:18
..	dir	-	root/root	drwxr-xr-x	2025-03-06 10:54:18
FontMap.GDI	text/plain	426 B	root/root	-rw-r--r--	2019-04-11 10:26:16
FontMap.Gnome	text/plain	392 B	root/root	-rw-r--r--	2019-04-11 10:26:16
FontMap.cpp	text/x-c	7.34 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
FontMap.h	text/x-c++	1.84 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
FontTableCache.cpp	text/x-c	2.37 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
FontTableCache.h	text/x-c++	1.06 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIFontInstance.cpp	text/x-c	9.6 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIFontInstance.h	text/x-c++	3.6 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIFontMap.cpp	text/x-c	1.32 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIFontMap.h	text/x-c++	1.23 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIGUISupport.cpp	text/x-c	862 B	root/root	-rw-r--r--	2019-04-11 10:26:16
GDIGUISupport.h	text/x-c++	949 B	root/root	-rw-r--r--	2019-04-11 10:26:16
GUISupport.h	text/x-c++	890 B	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeFontInstance.cpp	text/x-c	5.43 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeFontInstance.h	text/x-c++	3.79 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeFontMap.cpp	text/x-c	1.39 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeFontMap.h	text/x-c++	1.21 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeGUISupport.cpp	text/x-c	1.05 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
GnomeGUISupport.h	text/x-c++	961 B	root/root	-rw-r--r--	2019-04-11 10:26:16
LayoutSample.rc	text/x-c	3.37 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
Makefile	text/x-makefile	2.92 KB	root/root	-rw-r--r--	2020-03-20 07:31:39
Makefile.in	text/x-makefile	2.92 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
RenderingSurface.h	text/x-c++	1.09 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
Sample.txt	text/plain	1.66 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
ScriptCompositeFontInstance.cpp	text/x-c	3.2 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
ScriptCompositeFontInstance.h	text/x-c++	6.15 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
Surface.cpp	text/plain	892 B	root/root	-rw-r--r--	2019-04-11 10:26:16
Surface.h	text/x-c++	519 B	root/root	-rw-r--r--	2019-04-11 10:26:16
UnicodeReader.cpp	text/x-c	4.1 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
UnicodeReader.h	text/x-c++	999 B	root/root	-rw-r--r--	2019-04-11 10:26:16
arraymem.h	text/x-c	646 B	root/root	-rw-r--r--	2019-04-11 10:26:16
cgnomelayout.c	text/x-c	8.45 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
clayout.c	text/x-c	9.82 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
cmaps.cpp	text/x-c	5.3 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
cmaps.h	text/x-c++	2.06 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
gdiglue.cpp	text/x-c	1.67 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
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gnomeglue.cpp	text/x-c	1.64 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
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gnomelayout.cpp	text/x-c	8.5 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
gsupport.h	text/x-c	370 B	root/root	-rw-r--r--	2019-04-11 10:26:16
layout.cpp	text/x-c	9.8 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
layout.sln	text/plain	1.17 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
layout.vcxproj	text/xml	14.59 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
layout.vcxproj.filters	text/xml	3.06 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
paragraph.cpp	text/x-c	7.58 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
paragraph.h	text/x-c++	2.18 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
pflow.c	text/x-c	9.27 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
pflow.h	text/x-c	940 B	root/root	-rw-r--r--	2019-04-11 10:26:16
readme.html	text/html	7.32 KB	root/root	-rw-r--r--	2019-04-11 10:26:16
resource.h	text/x-c	907 B	root/root	-rw-r--r--	2019-04-11 10:26:16
rsurface.cpp	text/x-c	712 B	root/root	-rw-r--r--	2019-04-11 10:26:16
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