1 files changed, 141 insertions, 0 deletions
diff --git a/source/pdf/pdf-metrics.c b/source/pdf/pdf-metrics.c
new file mode 100644
index 00000000..8a4b7d11
--- /dev/null
+++ b/source/pdf/pdf-metrics.c
@@ -0,0 +1,141 @@
+#include "mupdf/pdf.h"
+
+void
+pdf_set_font_wmode(fz_context *ctx, pdf_font_desc *font, int wmode)
+{
+	font->wmode = wmode;
+}
+
+void
+pdf_set_default_hmtx(fz_context *ctx, pdf_font_desc *font, int w)
+{
+	font->dhmtx.w = w;
+}
+
+void
+pdf_set_default_vmtx(fz_context *ctx, pdf_font_desc *font, int y, int w)
+{
+	font->dvmtx.y = y;
+	font->dvmtx.w = w;
+}
+
+void
+pdf_add_hmtx(fz_context *ctx, pdf_font_desc *font, int lo, int hi, int w)
+{
+	if (font->hmtx_len + 1 >= font->hmtx_cap)
+	{
+		int new_cap = font->hmtx_cap + 16;
+		font->hmtx = fz_resize_array(ctx, font->hmtx, new_cap, sizeof(pdf_hmtx));
+		font->hmtx_cap = new_cap;
+	}
+
+	font->hmtx[font->hmtx_len].lo = lo;
+	font->hmtx[font->hmtx_len].hi = hi;
+	font->hmtx[font->hmtx_len].w = w;
+	font->hmtx_len++;
+}
+
+void
+pdf_add_vmtx(fz_context *ctx, pdf_font_desc *font, int lo, int hi, int x, int y, int w)
+{
+	if (font->vmtx_len + 1 >= font->vmtx_cap)
+	{
+		int new_cap = font->vmtx_cap + 16;
+		font->vmtx = fz_resize_array(ctx, font->vmtx, new_cap, sizeof(pdf_vmtx));
+		font->vmtx_cap = new_cap;
+	}
+
+	font->vmtx[font->vmtx_len].lo = lo;
+	font->vmtx[font->vmtx_len].hi = hi;
+	font->vmtx[font->vmtx_len].x = x;
+	font->vmtx[font->vmtx_len].y = y;
+	font->vmtx[font->vmtx_len].w = w;
+	font->vmtx_len++;
+}
+
+static int cmph(const void *a0, const void *b0)
+{
+	pdf_hmtx *a = (pdf_hmtx*)a0;
+	pdf_hmtx *b = (pdf_hmtx*)b0;
+	return a->lo - b->lo;
+}
+
+static int cmpv(const void *a0, const void *b0)
+{
+	pdf_vmtx *a = (pdf_vmtx*)a0;
+	pdf_vmtx *b = (pdf_vmtx*)b0;
+	return a->lo - b->lo;
+}
+
+void
+pdf_end_hmtx(fz_context *ctx, pdf_font_desc *font)
+{
+	if (!font->hmtx)
+		return;
+	qsort(font->hmtx, font->hmtx_len, sizeof(pdf_hmtx), cmph);
+	font->size += font->hmtx_cap * sizeof(pdf_hmtx);
+}
+
+void
+pdf_end_vmtx(fz_context *ctx, pdf_font_desc *font)
+{
+	if (!font->vmtx)
+		return;
+	qsort(font->vmtx, font->vmtx_len, sizeof(pdf_vmtx), cmpv);
+	font->size += font->vmtx_cap * sizeof(pdf_vmtx);
+}
+
+pdf_hmtx
+pdf_lookup_hmtx(fz_context *ctx, pdf_font_desc *font, int cid)
+{
+	int l = 0;
+	int r = font->hmtx_len - 1;
+	int m;
+
+	if (!font->hmtx)
+		goto notfound;
+
+	while (l <= r)
+	{
+		m = (l + r) >> 1;
+		if (cid < font->hmtx[m].lo)
+			r = m - 1;
+		else if (cid > font->hmtx[m].hi)
+			l = m + 1;
+		else
+			return font->hmtx[m];
+	}
+
+notfound:
+	return font->dhmtx;
+}
+
+pdf_vmtx
+pdf_lookup_vmtx(fz_context *ctx, pdf_font_desc *font, int cid)
+{
+	pdf_hmtx h;
+	pdf_vmtx v;
+	int l = 0;
+	int r = font->vmtx_len - 1;
+	int m;
+
+	if (!font->vmtx)
+		goto notfound;
+
+	while (l <= r)
+	{
+		m = (l + r) >> 1;
+		if (cid < font->vmtx[m].lo)
+			r = m - 1;
+		else if (cid > font->vmtx[m].hi)
+			l = m + 1;
+		else
+			return font->vmtx[m];
+	}
+
+notfound:
+	h = pdf_lookup_hmtx(ctx, font, cid);
+	v = font->dvmtx;
+	v.x = h.w / 2;
+	return v;
+}