/usr/share/doc/libicu-devel/samples/layout
Edit: /usr/share/doc/libicu-devel/samples/layout/FontMap.cpp (7517B)
/*
******************************************************************************
* © 2016 and later: Unicode, Inc. and others. *
* License & terms of use: http://www.unicode.org/copyright.html#License *
******************************************************************************
******************************************************************************
* Copyright (C) 1998-2006, International Business Machines Corporation and *
* others. All Rights Reserved. *
******************************************************************************
*/
#include
#include
#include
#include "unicode/utypes.h"
#include "unicode/uscript.h"
#include "layout/LETypes.h"
#include "layout/LEScripts.h"
#include "layout/LEFontInstance.h"
#include "GUISupport.h"
#include "FontMap.h"
FontMap::FontMap(const char *fileName, le_int16 pointSize, GUISupport *guiSupport, LEErrorCode &status)
: fPointSize(pointSize), fFontCount(0), fAscent(0), fDescent(0), fLeading(0), fGUISupport(guiSupport)
{
le_int32 defaultFont = -1, i, script;
le_bool haveFonts = FALSE;
/**/
for (i = 0; i < scriptCodeCount; i += 1) {
fFontIndices[i] = -1;
fFontNames[i] = NULL;
fFontInstances[i] = NULL;
}
/**/
if (LE_FAILURE(status)) {
return;
}
char *c, *scriptName, *fontName, *line, buffer[BUFFER_SIZE];
FILE *file;
file = fopen(fileName, "r");
if (file == NULL) {
sprintf(errorMessage, "Could not open the font map file: %s.", fileName);
fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
status = LE_FONT_FILE_NOT_FOUND_ERROR;
return;
}
while (fgets(buffer, BUFFER_SIZE, file) != NULL) {
UScriptCode scriptCode;
UErrorCode scriptStatus = U_ZERO_ERROR;
line = strip(buffer);
if (line[0] == '#' || line[0] == 0) {
continue;
}
c = strchr(line, ':');
c[0] = 0;
fontName = strip(&c[1]);
scriptName = strip(line);
if (strcmp(scriptName, "DEFAULT") == 0) {
defaultFont = getFontIndex(fontName);
haveFonts = TRUE;
continue;
}
le_int32 fillCount = uscript_getCode(scriptName, &scriptCode, 1, &scriptStatus);
if (U_FAILURE(scriptStatus) || fillCount <= 0 ||
scriptStatus == U_USING_FALLBACK_WARNING || scriptStatus == U_USING_DEFAULT_WARNING) {
sprintf(errorMessage, "The script name %s is invalid.", line);
fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
continue;
}
script = (le_int32) scriptCode;
if (fFontIndices[script] >= 0) {
// FIXME: complain that this is a duplicate entry and bail (?)
fFontIndices[script] = -1;
}
fFontIndices[script] = getFontIndex(fontName);
haveFonts = TRUE;
}
if (defaultFont >= 0) {
for (script = 0; script < scriptCodeCount; script += 1) {
if (fFontIndices[script] < 0) {
fFontIndices[script] = defaultFont;
}
}
}
if (! haveFonts) {
sprintf(errorMessage, "The font map file %s does not contain any valid scripts.", fileName);
fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
status = LE_ILLEGAL_ARGUMENT_ERROR;
}
fclose(file);
}
FontMap::~FontMap()
{
le_int32 font;
for (font = 0; font < fFontCount; font += 1) {
if (fFontNames[font] != NULL) {
delete[] (char *) fFontNames[font];
}
}
for (font = 0; font < fFontCount; font += 1) {
if (fFontInstances[font] != NULL) {
delete fFontInstances[font];
}
}
}
le_int32 FontMap::getFontIndex(const char *fontName)
{
le_int32 index;
for (index = 0; index < fFontCount; index += 1) {
if (strcmp(fontName, fFontNames[index]) == 0) {
return index;
}
}
if (fFontCount < (le_int32) scriptCodeCount) {
index = fFontCount++;
} else {
// The font name table is full. Since there can
// only be scriptCodeCount fonts in use at once,
// there should be at least one that's not being
// referenced; find it and resue it's index.
for (index = 0; index < fFontCount; index += 1) {
le_int32 script;
for (script = 0; script < scriptCodeCount; script += 1) {
if (fFontIndices[script] == index) {
break;
}
}
if (script >= scriptCodeCount) {
break;
}
}
}
if (index >= scriptCodeCount) {
return -1;
}
le_int32 len = strlen(fontName);
char *s = new char[len + 1];
fFontNames[index] = strcpy(s, fontName);
return index;
}
char *FontMap::strip(char *s)
{
le_int32 start, end, len;
start = 0;
len = strlen(s);
while (start < len && isspace(s[start])) {
start += 1;
}
end = len - 1;
while (end > start && isspace(s[end])) {
end -= 1;
}
if (end < len) {
s[end + 1] = '\0';
}
return &s[start];
}
const LEFontInstance *FontMap::getScriptFont(le_int32 scriptCode, LEErrorCode &status)
{
if (LE_FAILURE(status)) {
return NULL;
}
if (scriptCode <= -1 || scriptCode >= scriptCodeCount) {
status = LE_ILLEGAL_ARGUMENT_ERROR;
return NULL;
}
le_int32 fontIndex = fFontIndices[scriptCode];
if (fontIndex < 0) {
sprintf(errorMessage, "No font was set for script %s", uscript_getName((UScriptCode) scriptCode));
fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
status = LE_FONT_FILE_NOT_FOUND_ERROR;
return NULL;
}
if (fFontInstances[fontIndex] == NULL) {
fFontInstances[fontIndex] = openFont(fFontNames[fontIndex], fPointSize, status);
if (LE_FAILURE(status)) {
sprintf(errorMessage, "Could not open font file %s", fFontNames[fontIndex]);
fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
return NULL;
}
}
return fFontInstances[fontIndex];
}
le_int32 FontMap::getAscent() const
{
if (fAscent <= 0) {
((FontMap *) this)->getMaxMetrics();
}
return fAscent;
}
le_int32 FontMap::getDescent() const
{
if (fDescent <= 0) {
((FontMap *) this)->getMaxMetrics();
}
return fDescent;
}
le_int32 FontMap::getLeading() const
{
if (fLeading <= 0) {
((FontMap *) this)->getMaxMetrics();
}
return fLeading;
}
void FontMap::getMaxMetrics()
{
for (le_int32 i = 0; i < fFontCount; i += 1) {
LEErrorCode status = LE_NO_ERROR;
le_int32 ascent, descent, leading;
if (fFontInstances[i] == NULL) {
fFontInstances[i] = openFont(fFontNames[i], fPointSize, status);
if (LE_FAILURE(status)) {
continue;
}
}
ascent = fFontInstances[i]->getAscent();
descent = fFontInstances[i]->getDescent();
leading = fFontInstances[i]->getLeading();
if (ascent > fAscent) {
fAscent = ascent;
}
if (descent > fDescent) {
fDescent = descent;
}
if (leading > fLeading) {
fLeading = leading;
}
}
}