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-rw-r--r--modules/linux-fb/basic.c498
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diff --git a/modules/linux-fb/basic.c b/modules/linux-fb/basic.c
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+/* Pango
+ * basic.c:
+ *
+ * Copyright (C) 1999 Red Hat Software
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <iconv.h>
+
+#include <glib.h>
+#include <pango/pango.h>
+#include "gdkprivate-fb.h"
+#include <unicode.h>
+#include <fribidi/fribidi.h>
+
+PangoGlyph
+pango_fb_get_unknown_glyph(PangoFont *font)
+{
+ return '*';
+}
+
+typedef struct _CharRange CharRange;
+typedef struct _Charset Charset;
+typedef struct _CharCache CharCache;
+typedef struct _MaskTable MaskTable;
+
+#define MAX_CHARSETS 32
+
+typedef PangoGlyph (*ConvFunc) (CharCache *cache,
+ Charset *charset,
+ const gchar *input);
+struct _CharRange
+{
+ guint16 start;
+ guint16 end;
+ guint16 charsets;
+};
+
+struct _MaskTable
+{
+ int n_subfonts;
+
+ Charset **charsets;
+};
+
+#define MAX_CHARSETS 32
+
+struct _CharCache
+{
+#if 0
+ MaskTable *mask_tables[256];
+#endif
+ iconv_t converters[MAX_CHARSETS];
+};
+
+struct _Charset
+{
+ int index;
+ char *id;
+ char *x_charset;
+ ConvFunc conv_func;
+};
+
+static PangoGlyph conv_8bit (CharCache *cache,
+ Charset *charset,
+ const char *input);
+static PangoGlyph conv_euc (CharCache *cache,
+ Charset *charset,
+ const char *input);
+static PangoGlyph conv_ucs4 (CharCache *cache,
+ Charset *charset,
+ const char *input);
+
+/* From pango/utils.h */
+typedef guint16 GUChar2;
+typedef guint32 GUChar4;
+
+gboolean _pango_utf8_iterate (const char *cur,
+ const char **next,
+ GUChar4 *wc_out);
+GUChar2 *_pango_utf8_to_ucs2 (const char *str,
+ gint len);
+GUChar4 *_pango_utf8_to_ucs4 (const char *str,
+ int len);
+int _pango_guchar4_to_utf8 (GUChar4 c,
+ char *outbuf);
+int _pango_utf8_len (const char *str,
+ gint limit);
+
+#include "tables-big.i"
+
+static PangoEngineInfo script_engines[] = {
+ {
+ "BasicScriptEngineLang",
+ PANGO_ENGINE_TYPE_LANG,
+ PANGO_RENDER_TYPE_NONE,
+ basic_ranges, G_N_ELEMENTS(basic_ranges)
+ },
+ {
+ "BasicScriptEngineFB",
+ PANGO_ENGINE_TYPE_SHAPE,
+ "PangoRenderTypeFB",
+ basic_ranges, G_N_ELEMENTS(basic_ranges)
+ }
+};
+
+static gint n_script_engines = G_N_ELEMENTS (script_engines);
+
+/*
+ * Language script engine
+ */
+
+static void
+basic_engine_break (const char *text,
+ gint len,
+ PangoAnalysis *analysis,
+ PangoLogAttr *attrs)
+{
+}
+
+static PangoEngine *
+basic_engine_lang_new ()
+{
+ PangoEngineLang *result;
+
+ result = g_new (PangoEngineLang, 1);
+
+ result->engine.id = "BasicScriptEngine";
+ result->engine.type = PANGO_ENGINE_TYPE_LANG;
+ result->engine.length = sizeof (result);
+ result->script_break = basic_engine_break;
+
+ return (PangoEngine *)result;
+}
+
+/*
+ * FB window system script engine portion
+ */
+
+static CharCache *
+char_cache_new (void)
+{
+ CharCache *result;
+ int i;
+
+ result = g_new0 (CharCache, 1);
+
+ for (i=0; i < MAX_CHARSETS; i++)
+ result->converters[i] = (iconv_t)-1;
+
+ return result;
+}
+
+static void
+char_cache_free (CharCache *cache)
+{
+ int i;
+
+#if 0
+ for (i=0; i < 256; i++)
+ if (cache->mask_tables[i])
+ {
+ g_free (cache->mask_tables[i]->subfonts);
+ g_free (cache->mask_tables[i]->charsets);
+
+ g_free (cache->mask_tables[i]);
+ }
+#endif
+
+ for (i=0; i<MAX_CHARSETS; i++)
+ if (cache->converters[i] != (iconv_t)-1)
+ iconv_close (cache->converters[i]);
+
+ g_free (cache);
+}
+
+PangoGlyph
+find_char (CharCache *cache, PangoFont *font, GUChar4 wc, const char *input)
+{
+ return FT_Get_Char_Index(PANGO_FB_FONT(font)->ftf, wc);
+}
+
+static void
+set_glyph (PangoFont *font, PangoGlyphString *glyphs, int i, int offset, PangoGlyph glyph)
+{
+ PangoRectangle logical_rect;
+
+ glyphs->glyphs[i].glyph = glyph;
+
+ glyphs->glyphs[i].geometry.x_offset = 0;
+ glyphs->glyphs[i].geometry.y_offset = 0;
+
+ glyphs->log_clusters[i] = offset;
+
+ pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, NULL, &logical_rect);
+ glyphs->glyphs[i].geometry.width = logical_rect.width;
+}
+
+static iconv_t
+find_converter (CharCache *cache, Charset *charset)
+{
+ iconv_t cd = cache->converters[charset->index];
+ if (cd == (iconv_t)-1)
+ {
+ cd = iconv_open (charset->id, "UTF-8");
+ g_assert (cd != (iconv_t)-1);
+ cache->converters[charset->index] = cd;
+ }
+
+ return cd;
+}
+
+static PangoGlyph
+conv_8bit (CharCache *cache,
+ Charset *charset,
+ const char *input)
+{
+ iconv_t cd;
+ char outbuf;
+ const char *p;
+
+ const char *inptr = input;
+ size_t inbytesleft;
+ char *outptr = &outbuf;
+ size_t outbytesleft = 1;
+
+ _pango_utf8_iterate (input, &p, NULL);
+ inbytesleft = p - input;
+
+ cd = find_converter (cache, charset);
+
+ iconv (cd, (const char **)&inptr, &inbytesleft, &outptr, &outbytesleft);
+
+ return (guchar)outbuf;
+}
+
+static PangoGlyph
+conv_euc (CharCache *cache,
+ Charset *charset,
+ const char *input)
+{
+ iconv_t cd;
+ char outbuf[2];
+ const char *p;
+
+ const char *inptr = input;
+ size_t inbytesleft;
+ char *outptr = outbuf;
+ size_t outbytesleft = 2;
+
+ _pango_utf8_iterate (input, &p, NULL);
+ inbytesleft = p - input;
+
+ cd = find_converter (cache, charset);
+
+ iconv (cd, &inptr, &inbytesleft, &outptr, &outbytesleft);
+
+ if ((guchar)outbuf[0] < 128)
+ return outbuf[0];
+ else
+ return ((guchar)outbuf[0] & 0x7f) * 256 + ((guchar)outbuf[1] & 0x7f);
+}
+
+static PangoGlyph
+conv_ucs4 (CharCache *cache,
+ Charset *charset,
+ const char *input)
+{
+ GUChar4 wc;
+
+ unicode_get_utf8 (input, &wc);
+ return wc;
+}
+
+static void
+swap_range (PangoGlyphString *glyphs, int start, int end)
+{
+ int i, j;
+
+ for (i = start, j = end - 1; i < j; i++, j--)
+ {
+ PangoGlyphInfo glyph_info;
+ gint log_cluster;
+
+ glyph_info = glyphs->glyphs[i];
+ glyphs->glyphs[i] = glyphs->glyphs[j];
+ glyphs->glyphs[j] = glyph_info;
+
+ log_cluster = glyphs->log_clusters[i];
+ glyphs->log_clusters[i] = glyphs->log_clusters[j];
+ glyphs->log_clusters[j] = log_cluster;
+ }
+}
+
+static CharCache *
+get_char_cache (PangoFont *font)
+{
+ GQuark cache_id = g_quark_from_string ("basic-char-cache");
+
+ CharCache *cache = g_object_get_qdata (G_OBJECT (font), cache_id);
+ if (!cache)
+ {
+ cache = char_cache_new ();
+ g_object_set_qdata_full (G_OBJECT (font), cache_id,
+ cache, (GDestroyNotify)char_cache_free);
+ }
+
+ return cache;
+}
+
+static void
+basic_engine_shape (PangoFont *font,
+ const char *text,
+ gint length,
+ PangoAnalysis *analysis,
+ PangoGlyphString *glyphs)
+{
+ int n_chars;
+ int i;
+ const char *p;
+ const char *next;
+
+ CharCache *cache;
+
+ g_return_if_fail (font != NULL);
+ g_return_if_fail (text != NULL);
+ g_return_if_fail (length >= 0);
+ g_return_if_fail (analysis != NULL);
+
+ cache = get_char_cache (font);
+
+ n_chars = unicode_strlen (text, length);
+ pango_glyph_string_set_size (glyphs, n_chars);
+
+ p = text;
+ for (i=0; i < n_chars; i++)
+ {
+ GUChar4 wc;
+ FriBidiChar mirrored_ch;
+ PangoGlyph index;
+ char buf[6];
+ const char *input;
+
+ _pango_utf8_iterate (p, &next, &wc);
+
+ input = p;
+ if (analysis->level % 2)
+ if (fribidi_get_mirror_char (wc, &mirrored_ch))
+ {
+ wc = mirrored_ch;
+
+ _pango_guchar4_to_utf8 (wc, buf);
+ input = buf;
+ }
+
+ if (wc == 0x200B || wc == 0x200E || wc == 0x200F) /* Zero-width characters */
+ {
+ set_glyph (font, glyphs, i, p - text, 0);
+ }
+ else
+ {
+ index = find_char (cache, font, wc, input);
+ if (index)
+ {
+ set_glyph (font, glyphs, i, p - text, index);
+
+ if (unicode_type (wc) == UNICODE_NON_SPACING_MARK)
+ {
+ if (i > 0)
+ {
+ PangoRectangle logical_rect, ink_rect;
+
+ glyphs->glyphs[i].geometry.width = MAX (glyphs->glyphs[i-1].geometry.width,
+ glyphs->glyphs[i].geometry.width);
+ glyphs->glyphs[i-1].geometry.width = 0;
+ glyphs->log_clusters[i] = glyphs->log_clusters[i-1];
+
+ /* Some heuristics to try to guess how overstrike glyphs are
+ * done and compensate
+ */
+ pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, &ink_rect, &logical_rect);
+ if (logical_rect.width == 0 && ink_rect.x == 0)
+ glyphs->glyphs[i].geometry.x_offset = (glyphs->glyphs[i].geometry.width - ink_rect.width) / 2;
+ }
+ }
+ }
+ else
+ set_glyph (font, glyphs, i, p - text, pango_fb_get_unknown_glyph (font));
+ }
+
+ p = next;
+ }
+
+ /* Simple bidi support... may have separate modules later */
+
+ if (analysis->level % 2)
+ {
+ int start, end;
+
+ /* Swap all glyphs */
+ swap_range (glyphs, 0, n_chars);
+
+ /* Now reorder glyphs within each cluster back to LTR */
+ for (start=0; start<n_chars;)
+ {
+ end = start;
+ while (end < n_chars &&
+ glyphs->log_clusters[end] == glyphs->log_clusters[start])
+ end++;
+
+ swap_range (glyphs, start, end);
+ start = end;
+ }
+ }
+}
+
+static PangoCoverage *
+basic_engine_get_coverage (PangoFont *font,
+ const char *lang)
+{
+ CharCache *cache = get_char_cache (font);
+ PangoCoverage *result = pango_coverage_new ();
+ GUChar4 wc;
+
+ for (wc = 0; wc < 65536; wc++)
+ {
+ char buf[6];
+
+ _pango_guchar4_to_utf8 (wc, buf);
+ if (find_char (cache, font, wc, buf))
+ pango_coverage_set (result, wc, PANGO_COVERAGE_EXACT);
+ }
+
+ return result;
+}
+
+static PangoEngine *
+basic_engine_fb_new ()
+{
+ PangoEngineShape *result;
+
+ result = g_new (PangoEngineShape, 1);
+
+ result->engine.id = "BasicScriptEngineFB";
+ result->engine.type = PANGO_ENGINE_TYPE_LANG;
+ result->engine.length = sizeof (result);
+ result->script_shape = basic_engine_shape;
+ result->get_coverage = basic_engine_get_coverage;
+
+ return (PangoEngine *)result;
+}
+
+/* The following three functions provide the public module API for
+ * Pango
+ */
+#ifdef MODULE_PREFIX
+#define MODULE_ENTRY(func) _pango_basic_##func
+#else
+#define MODULE_ENTRY(func) func
+#endif
+
+void
+MODULE_ENTRY(script_engine_list) (PangoEngineInfo **engines, gint *n_engines)
+{
+ *engines = script_engines;
+ *n_engines = n_script_engines;
+}
+
+PangoEngine *
+MODULE_ENTRY(script_engine_load) (const char *id)
+{
+ if (!strcmp (id, "BasicScriptEngineFB"))
+ return basic_engine_fb_new ();
+ else if (!strcmp (id, "BasicScriptEngineLang"))
+ return basic_engine_lang_new ();
+ else
+ return NULL;
+}
+
+void
+MODULE_ENTRY(script_engine_unload) (PangoEngine *engine)
+{
+}
+
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