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@salass00 salass00/getbaseline.c Secret
Created Oct 6, 2017

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Calculate baseline for outline font.
#include <diskfont/diskfont.h>
#include <diskfont/diskfonttag.h>
#include <diskfont/glyph.h>
#include <proto/diskfont.h>
#include <stdio.h>
int main(int argc, char **argv) {
struct OutlineFont *olf;
const uint32 devdpi = (72 << 16) | 72;
const uint32 ysize = 16;
uint32 charset;
uint32 maptable[256];
uint32 code;
int32 error;
int32 yorigin;
int32 ascent, descent;
int32 baseline;
struct GlyphMap *gm;
if (argc != 2) {
printf("Usage: getbaseline <font>\n");
return RETURN_ERROR;
}
/* Use system default charset */
charset = IDiskfont->GetDiskFontCtrl(DFCTRL_CHARSET);
/* Get mapping table */
if (charset == 4) {
/* ISO 8859-1 Latin1 */
for (code = 0; code < 256; code++) {
maptable[code] = code;
}
} else {
const uint32 *src;
src = (const uint32 *)IDiskfont->ObtainCharsetInfo(DFCS_NUMBER, charset, DFCS_MAPTABLE);
if (src == NULL) {
fprintf(stderr, "Mapping table not found for charset: %lu!\n", charset);
return RETURN_ERROR;
}
for (code = 0; code < 256; code++) {
maptable[code] = src[code];
}
}
/* Open outline font */
olf = IDiskfont->OpenOutlineFont(argv[1], NULL, OFF_OPEN);
if (olf == NULL) {
printf("Failed to open font '%s'!\n", argv[1]);
return RETURN_ERROR;
}
/* Set DPI and point height */
error = IDiskfont->ESetInfo(&olf->olf_EEngine,
OT_DeviceDPI, devdpi,
OT_PointHeight, ysize << 16,
TAG_END);
if (error) {
printf("Failed to set DPI and point height!\n");
IDiskfont->CloseOutlineFont(olf, NULL);
return RETURN_ERROR;
}
ascent = descent = 0;
/* Set ascent and descent according to glyph dimensions */
for (code = 0; code < 256; code++) {
error = IDiskfont->ESetInfo(&olf->olf_EEngine,
OT_GlyphCode, maptable[code],
TAG_END);
if (error)
continue;
error = IDiskfont->EObtainInfo(&olf->olf_EEngine,
OT_GlyphMap8Bit, &gm,
TAG_END);
if (error)
continue;
if (gm->glm_BlackWidth) {
yorigin = gm->glm_Y0;
if (ascent < (yorigin - gm->glm_BlackTop))
ascent = yorigin - gm->glm_BlackTop;
if (descent < (gm->glm_BlackTop + gm->glm_BlackHeight - yorigin))
descent = gm->glm_BlackTop + gm->glm_BlackHeight - yorigin;
}
IDiskfont->EReleaseInfo(&olf->olf_EEngine,
OT_GlyphMap, gm,
TAG_END);
}
/* Calculate baseline from ascent and descent */
baseline = ascent - 1;
if ((ascent + descent) > ysize)
baseline -= (ascent + descent - ysize + 1) * 2 / 3;
printf("Baseline: %ld\n", baseline);
IDiskfont->CloseOutlineFont(olf, NULL);
return RETURN_OK;
}
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