Hello,
I am currently implementing character replacement in McCLIM (if a character is missing from the font, pick a different font that has the character).
I observe that FcFontMatch returns some unexpected values.
The code is written in Lisp, but I wrote a simple C program that replicates the behaviour. The program simply attempts to find a font that contains the character U+063A.
When I use FcMatchPattern, the program returns DejaVuSans.ttf. If I use FcMatchFont instead, it returns FreeMono.ttf.
The interesting thing is that none of these fonts actually contains U+0x63A (checked by reading the "charset" value).
What is the correct way to perform this operation?
A second question: What is the actual difference between FcMatchPattern and FcMatchFont? The documentation isn't very clear on that.
Regards,
Elias
The test program follows:
#include <fontconfig/fontconfig.h>
#include <stdio.h>
#include <stdlib.h>
void checkError(FcBool result) {
if(!result) {
fprintf(stderr, "error from fontconfig call\n");
abort();
}
}
int main(void)
{
FcConfig *config = FcInitLoadConfigAndFonts();
FcPattern *pattern = FcPatternCreate();
FcCharSet *charset = FcCharSetCreate();
checkError(FcCharSetAddChar(charset, 0x63a));
checkError(FcPatternAddCharSet(pattern, "charset", charset));
FcCharSetDestroy(charset);
checkError(FcConfigSubstitute(config, pattern, FcMatchPattern));
FcDefaultSubstitute(pattern);
FcResult result;
FcPattern *resultPattern = FcFontMatch(config, pattern, &result);
if(result != FcResultMatch) {
fprintf(stderr, "no fonts matched\n");
return 1;
}
FcValue value;
FcResult patternResult = FcPatternGet(resultPattern, "file", 0, &value);
if(patternResult != FcResultMatch) {
fprintf(stderr, "file value not found\n");
return 1;
}
if(value.type != FcTypeString) {
fprintf(stderr, "expected to find a string value\n");
return 1;
}
printf("font file = %s\n", value.u.s);
FcPatternDestroy(pattern);
return 0;
}
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