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path: root/pango/opentype/pango-ot-buffer.c
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Diffstat (limited to 'pango/opentype/pango-ot-buffer.c')
-rw-r--r--pango/opentype/pango-ot-buffer.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/pango/opentype/pango-ot-buffer.c b/pango/opentype/pango-ot-buffer.c
new file mode 100644
index 00000000..9b548666
--- /dev/null
+++ b/pango/opentype/pango-ot-buffer.c
@@ -0,0 +1,265 @@
+/* Pango
+ * pango-ot-buffer.c: Buffer of glyphs for shaping/positioning
+ *
+ * Copyright (C) 2004 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 "pango-ot-private.h"
+
+#define PANGO_SCALE_26_6 (PANGO_SCALE / (1<<6))
+#define PANGO_UNITS_26_6(d) (PANGO_SCALE_26_6 * (d))
+
+PangoOTBuffer *
+pango_ot_buffer_new (PangoFcFont *font)
+{
+ /* We lock the font here immediately for the silly reason
+ * of getting the FT_Memory; otherwise we'd have to
+ * add a new operation to PangoFcFontmap; callers will
+ * probably already have the font locked, however,
+ * so there is little performance penalty.
+ */
+ PangoOTBuffer *buffer = g_new (PangoOTBuffer, 1);
+ FT_Face face = pango_fc_font_lock_face (font);
+
+ if (otl_buffer_new (face->memory, &buffer->buffer) != FT_Err_Ok)
+ g_error ("Allocation of OTLBuffer failed");
+
+ buffer->font = g_object_ref (font);
+ buffer->applied_gpos = FALSE;
+ buffer->rtl = FALSE;
+
+ pango_fc_font_unlock_face (font);
+
+ return buffer;
+}
+
+void
+pango_ot_buffer_destroy (PangoOTBuffer *buffer)
+{
+ otl_buffer_free (buffer->buffer);
+ g_object_unref (buffer->font);
+ g_free (buffer);
+}
+
+void
+pango_ot_buffer_clear (PangoOTBuffer *buffer)
+{
+ otl_buffer_clear (buffer->buffer);
+ buffer->applied_gpos = FALSE;
+}
+
+void
+pango_ot_buffer_add_glyph (PangoOTBuffer *buffer,
+ guint glyph_index,
+ guint properties,
+ guint cluster)
+{
+ otl_buffer_add_glyph (buffer->buffer,
+ glyph_index, properties, cluster);
+
+}
+
+void
+pango_ot_buffer_set_rtl (PangoOTBuffer *buffer,
+ gboolean rtl)
+{
+ rtl = rtl != FALSE;
+ buffer->rtl = rtl;
+}
+
+void
+pango_ot_buffer_get_glyphs (PangoOTBuffer *buffer,
+ PangoOTGlyph **glyphs,
+ int *n_glyphs)
+{
+ if (glyphs)
+ *glyphs = (PangoOTGlyph *)buffer->buffer->in_string;
+
+ if (n_glyphs)
+ *n_glyphs = buffer->buffer->in_length;
+}
+
+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 void
+apply_gpos_ltr (PangoGlyphString *glyphs,
+ OTL_Position positions)
+{
+ int i;
+
+ for (i = 0; i < glyphs->num_glyphs; i++)
+ {
+ FT_Pos x_pos = positions[i].x_pos;
+ FT_Pos y_pos = positions[i].y_pos;
+ int back = i;
+ int j;
+
+ while (positions[back].back != 0)
+ {
+ back -= positions[back].back;
+ x_pos += positions[back].x_pos;
+ y_pos += positions[back].y_pos;
+ }
+
+ for (j = back; j < i; j++)
+ glyphs->glyphs[i].geometry.x_offset -= glyphs->glyphs[j].geometry.width;
+
+ glyphs->glyphs[i].geometry.x_offset += PANGO_UNITS_26_6(x_pos);
+ glyphs->glyphs[i].geometry.y_offset += PANGO_UNITS_26_6(y_pos);
+
+ if (positions[i].new_advance)
+ glyphs->glyphs[i].geometry.width = PANGO_UNITS_26_6(positions[i].x_advance);
+ else
+ glyphs->glyphs[i].geometry.width += PANGO_UNITS_26_6(positions[i].x_advance);
+ }
+}
+
+static void
+apply_gpos_rtl (PangoGlyphString *glyphs,
+ OTL_Position positions)
+{
+ int i;
+
+ for (i = 0; i < glyphs->num_glyphs; i++)
+ {
+ int i_rev = glyphs->num_glyphs - i - 1;
+ int back_rev = i_rev;
+ int back;
+ FT_Pos x_pos = positions[i_rev].x_pos;
+ FT_Pos y_pos = positions[i_rev].y_pos;
+ int j;
+
+ while (positions[back_rev].back != 0)
+ {
+ back_rev -= positions[back_rev].back;
+ x_pos += positions[back_rev].x_pos;
+ y_pos += positions[back_rev].y_pos;
+ }
+
+ back = glyphs->num_glyphs - back_rev - 1;
+
+ for (j = i; j < back; j++)
+ glyphs->glyphs[i].geometry.x_offset += glyphs->glyphs[j].geometry.width;
+
+ glyphs->glyphs[i].geometry.x_offset += PANGO_UNITS_26_6(x_pos);
+ glyphs->glyphs[i].geometry.y_offset -= PANGO_UNITS_26_6(y_pos);
+
+ if (positions[i_rev].new_advance)
+ glyphs->glyphs[i].geometry.width = PANGO_UNITS_26_6(positions[i_rev].x_advance);
+ else
+ glyphs->glyphs[i].geometry.width += PANGO_UNITS_26_6(positions[i_rev].x_advance);
+ }
+}
+
+void
+pango_ot_buffer_output (PangoOTBuffer *buffer,
+ PangoGlyphString *glyphs)
+{
+ FT_Face face;
+ PangoOTInfo *info;
+ TTO_GDEF gdef = NULL;
+ int i;
+ int last_cluster;
+
+ face = pango_fc_font_lock_face (buffer->font);
+ g_assert (face);
+
+ /* Copy glyphs into output glyph string */
+ pango_glyph_string_set_size (glyphs, buffer->buffer->in_length);
+
+ last_cluster = -1;
+ for (i = 0; i < buffer->buffer->in_length; i++)
+ {
+ OTL_GlyphItem item = &buffer->buffer->in_string[i];
+
+ glyphs->glyphs[i].glyph = item->gindex;
+
+ glyphs->log_clusters[i] = item->cluster;
+ if (glyphs->log_clusters[i] != last_cluster)
+ glyphs->glyphs[i].attr.is_cluster_start = 1;
+ else
+ glyphs->glyphs[i].attr.is_cluster_start = 0;
+
+ last_cluster = glyphs->log_clusters[i];
+ }
+
+ info = pango_ot_info_get (face);
+ gdef = pango_ot_info_get_gdef (info);
+
+ /* Apply default positioning */
+ for (i = 0; i < glyphs->num_glyphs; i++)
+ {
+ if (glyphs->glyphs[i].glyph)
+ {
+ PangoRectangle logical_rect;
+
+ FT_UShort property;
+
+ if (gdef &&
+ TT_GDEF_Get_Glyph_Property (gdef, glyphs->glyphs[i].glyph, &property) == FT_Err_Ok &&
+ (property == TTO_MARK || (property & IGNORE_SPECIAL_MARKS) != 0))
+ {
+ glyphs->glyphs[i].geometry.width = 0;
+ }
+ else
+ {
+ pango_font_get_glyph_extents ((PangoFont *)buffer->font, glyphs->glyphs[i].glyph, NULL, &logical_rect);
+ glyphs->glyphs[i].geometry.width = logical_rect.width;
+ }
+ }
+ else
+ glyphs->glyphs[i].geometry.width = 0;
+
+ glyphs->glyphs[i].geometry.x_offset = 0;
+ glyphs->glyphs[i].geometry.y_offset = 0;
+ }
+
+ if (buffer->rtl)
+ {
+ /* Swap all glyphs */
+ swap_range (glyphs, 0, glyphs->num_glyphs);
+ }
+
+ if (buffer->applied_gpos)
+ {
+ if (buffer->rtl)
+ apply_gpos_rtl (glyphs, buffer->buffer->positions);
+ else
+ apply_gpos_ltr (glyphs, buffer->buffer->positions);
+ }
+
+ pango_fc_font_unlock_face (buffer->font);
+}
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