SharpMuPDF/mupdf/source/pdf/pdf-metrics.c

// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

#include "mupdf/fitz.h"
#include "mupdf/pdf.h"

#include <stdlib.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_realloc_array(ctx, font->hmtx, new_cap, 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_realloc_array(ctx, font->vmtx, new_cap, 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;
}