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/* Copyright (C) 2001 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gsgdata.c,v 1.3 2002/02/21 22:24:52 giles Exp $ */
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/* Support for glyph data access */
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#include "memory_.h"
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#include "gx.h"
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#include "gsgdata.h"
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#include "gserrors.h"
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#include "gsmatrix.h" /* for gsfont.h */
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#include "gsstruct.h"
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#include "gxfont.h"
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/* GC structure descriptor */
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private ENUM_PTRS_WITH(gs_glyph_data_enum_ptrs, gs_glyph_data_t *pgd)
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case 0: return ENUM_CONST_BYTESTRING(&pgd->bits);
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case 1: return ENUM_OBJ(pgd->proc_data);
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ENUM_PTRS_END
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private RELOC_PTRS_WITH(gs_glyph_data_reloc_ptrs, gs_glyph_data_t *pgd)
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{
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RELOC_CONST_BYTESTRING_VAR(pgd->bits);
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RELOC_OBJ_VAR(pgd->proc_data);
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} RELOC_PTRS_END
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gs_public_st_composite(st_glyph_data, gs_glyph_data_t, "gs_glyph_data_t",
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gs_glyph_data_enum_ptrs, gs_glyph_data_reloc_ptrs);
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/* ------ Client facilities ------ */
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/* Replace glyph data by a substring. */
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int
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gs_glyph_data_substring(gs_glyph_data_t *pgd, uint offset, uint size)
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{
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if (offset > pgd->bits.size || size > pgd->bits.size - offset)
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return_error(gs_error_rangecheck);
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return pgd->procs->substring(pgd, offset, size);
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}
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/* Free the data for a glyph. */
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void
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gs_glyph_data_free(gs_glyph_data_t *pgd, client_name_t cname)
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{
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pgd->procs->free(pgd, cname);
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gs_glyph_data_from_null(pgd);
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}
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/* ------ Implementor support ------ */
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/* Don't manage the glyph data. */
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private void
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glyph_data_free_permanent(gs_glyph_data_t *pgd, client_name_t cname)
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{
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}
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private int
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glyph_data_substring_permanent(gs_glyph_data_t *pgd, uint offset, uint size)
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{
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pgd->bits.data += offset;
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pgd->bits.size = size;
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return 0;
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}
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/* Manage the glyph data using the font's allocator. */
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private void
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glyph_data_free_by_font(gs_glyph_data_t *pgd, client_name_t cname)
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{
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gs_free_const_bytestring(((gs_font *)pgd->proc_data)->memory,
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&pgd->bits, cname);
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}
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private int
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glyph_data_substring_by_font(gs_glyph_data_t *pgd, uint offset, uint size)
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{
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gs_font *const font = pgd->proc_data;
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byte *data = (byte *)pgd->bits.data; /* break const */
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if (pgd->bits.bytes) /* object, not string */
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return glyph_data_substring_permanent(pgd, offset, size);
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if (offset > 0)
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memmove(data, data + offset, size);
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pgd->bits.data =
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gs_resize_string(font->memory, data, pgd->bits.size, size,
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"glyph_data_substring"); /* shortening, can't fail */
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pgd->bits.size = size;
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return 0;
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}
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private const gs_glyph_data_procs_t no_free_procs = {
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glyph_data_free_permanent, glyph_data_substring_permanent
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};
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private const gs_glyph_data_procs_t free_by_font_procs = {
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glyph_data_free_by_font, glyph_data_substring_by_font
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};
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/*
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* Initialize glyph data from a string or from bytes. If the font is NULL
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* (for glyph data that is part of the font), set the glyph data freeing
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* procedure to "do not free"; if the font is not NULL (for just-allocated
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* glyph data), set the freeing procedure to "free using the font's
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* allocator."
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*/
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void
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gs_glyph_data_from_string(gs_glyph_data_t *pgd, const byte *data,
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uint size, gs_font *font)
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{
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gs_bytestring_from_string(&pgd->bits, data, size);
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pgd->proc_data = font;
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pgd->procs = (font ? &free_by_font_procs : &no_free_procs);
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}
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void
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gs_glyph_data_from_bytes(gs_glyph_data_t *pgd, const byte *bytes,
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uint offset, uint size, gs_font *font)
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{
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gs_bytestring_from_bytes(&pgd->bits, bytes, offset, size);
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pgd->proc_data = font;
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pgd->procs = (font ? &free_by_font_procs : &no_free_procs);
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}
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void
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gs_glyph_data_from_null(gs_glyph_data_t *pgd)
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{
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gs_glyph_data_from_string(pgd, NULL, 0, NULL);
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}
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