Start ft glue

src/hb-ft.c

diff --git a/src/hb-ft.c b/src/hb-ft.c
new file mode 100644
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--- /dev/null
+++ b/src/hb-ft.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2009  Red Hat, Inc.
+ * Copyright (C) 2009  Keith Stribley <devel@thanlwinsoft.org>
+ *
+ *  This is part of HarfBuzz, an OpenType Layout engine library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#include "hb-private.h"
+
+#include "hb-ft.h"
+
+#include "hb-font-private.h"
+
+#include FT_TRUETYPE_TABLES_H
+
+#if 0
+extern hb_codepoint_t hb_GetGlyph(hb_font_t *font, hb_face_t *face, const void *user_data,
+                            hb_codepoint_t unicode, hb_codepoint_t variant_selector)
+{
+    FT_Face fcFace = (FT_Face)user_data;
+    return FT_Get_Char_Index(fcFace, unicode);
+}
+
+extern hb_bool_t hb_GetContourPoint(hb_font_t *font, hb_face_t *face, const void *user_data,
+                               hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
+{
+    unsigned int point = 0; /* TODO this should be in API */
+    int load_flags = FT_LOAD_DEFAULT;
+
+    FT_Face fcFace = (FT_Face)user_data;
+    if (FT_Load_Glyph(fcFace, glyph, load_flags))
+        return 0;
+
+    if (fcFace->glyph->format != ft_glyph_format_outline)
+        return 0;
+
+    unsigned int nPoints = fcFace->glyph->outline.n_points;
+    if (!(nPoints))
+        return 0;
+
+    if (point > nPoints)
+        return 0;
+
+    *x = fcFace->glyph->outline.points[point].x;
+    *y = fcFace->glyph->outline.points[point].y;
+
+    return 1;
+}
+
+extern void hb_GetGlyphMetrics(hb_font_t *font, hb_face_t *face, const void *user_data,
+                          hb_codepoint_t glyph, hb_glyph_metrics_t *metrics)
+{
+    int load_flags = FT_LOAD_DEFAULT;
+    FT_Face fcFace = (FT_Face)user_data;
+
+    metrics->x = metrics->y = 0;
+	metrics->x_offset = metrics->y_offset = 0;
+    if (FT_Load_Glyph(fcFace, glyph, load_flags))
+    {
+        metrics->width = metrics->height = 0;
+    }
+    else
+    {
+        metrics->width = fcFace->glyph->metrics.width;
+        metrics->height = fcFace->glyph->metrics.height;
+		metrics->x_offset = fcFace->glyph->advance.x;
+		metrics->y_offset = fcFace->glyph->advance.y;
+    }
+}
+
+extern hb_position_t hb_GetKerning(hb_font_t *font, hb_face_t *face, const void *user_data,
+                             hb_codepoint_t first_glyph, hb_codepoint_t second_glyph)
+{
+    FT_Face fcFace = (FT_Face)user_data;
+    FT_Vector aKerning;
+    if (FT_Get_Kerning(fcFace, first_glyph, second_glyph, FT_KERNING_DEFAULT,
+                       &aKerning))
+    {
+        return 0;
+    }
+    return aKerning.x;
+}
+#endif
+
+static hb_font_funcs_t ft_ffuncs = {
+  HB_REFERENCE_COUNT_INVALID, /* ref_count */
+
+  TRUE, /* immutable */
+
+#if 0
+  hb_ft_get_glyph,
+  hb_ft_get_contour_point,
+  hb_ft_get_glyph_metrics,
+  hb_ft_get_kerning
+#endif
+};
+
+hb_font_funcs_t *
+hb_ft_get_font_funcs (void)
+{
+  return &ft_ffuncs;
+}
+
+
+static hb_blob_t *
+_get_table  (hb_tag_t tag, void *user_data)
+{
+  FT_Face ft_face = (FT_Face) user_data;
+  FT_Byte *buffer;
+  FT_ULong  length = 0;
+  FT_Error error;
+
+  error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
+  if (error)
+    return hb_blob_create_empty ();
+
+  buffer = malloc (length);
+  if (buffer == NULL)
+    return hb_blob_create_empty ();
+
+  error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
+  if (error)
+    return hb_blob_create_empty ();
+
+  return hb_blob_create ((const char *) buffer, length,
+			 HB_MEMORY_MODE_WRITABLE,
+			 free, buffer);
+}
+
+
+hb_face_t *
+hb_ft_face_create (FT_Face           ft_face,
+		   hb_destroy_func_t destroy)
+{
+  hb_face_t *face;
+
+  if (ft_face->stream->base != NULL) {
+    hb_blob_t *blob;
+
+    blob = hb_blob_create ((const char *) ft_face->stream->base,
+			   (unsigned int) ft_face->stream->size,
+			   HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
+			   destroy, ft_face);
+    face = hb_face_create_for_data (blob, ft_face->face_index);
+    hb_blob_destroy (blob);
+  } else {
+    face = hb_face_create_for_tables (_get_table, destroy, ft_face);
+  }
+
+  return face;
+}
+
+
+hb_font_t *
+hb_ft_font_create (FT_Face           ft_face,
+		   hb_destroy_func_t destroy)
+{
+  hb_font_t *font;
+
+  font = hb_font_create ();
+  hb_font_set_funcs (font,
+		     hb_ft_get_font_funcs (),
+		     destroy, ft_face);
+  hb_font_set_scale (font,
+		     ft_face->size->metrics.x_scale,
+		     ft_face->size->metrics.y_scale);
+  hb_font_set_ppem (font,
+		    ft_face->size->metrics.x_ppem,
+		    ft_face->size->metrics.y_ppem);
+
+  return font;
+}