/*

 * Copyright © 2011  Google, Inc.

 *

 *  This is part of HarfBuzz, a text shaping 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.

 *

 * Google Author(s): Behdad Esfahbod

 */

#include "hb-test.h"

/* Unit tests for hb-shape.h */

/*

 * This test provides a framework to test aspects of hb_shape() that are

 * font-independent.  Please add tests for any feature that fits that

 * description.

 */

/* TODO Make this test data-driven and add some real test data */

/* TODO Test positions too. And test non-native direction.  Test commit 2e18c6dbdfb */

static const char test_data[] = "test\0data";

static hb_position_t

glyph_h_advance_func (hb_font_t *font, void *font_data,

		      hb_codepoint_t glyph,

		      void *user_data)

{

  switch (glyph) {

  case 1: return 10;

  case 2: return 6;

  case 3: return 5;

  }

  return 0;

}

static hb_bool_t

glyph_func (hb_font_t *font, void *font_data,

	    hb_codepoint_t unicode, hb_codepoint_t variant_selector,

	    hb_codepoint_t *glyph,

	    void *user_data)

{

  switch (unicode) {

  case 'T': *glyph = 1; return TRUE;

  case 'e': *glyph = 2; return TRUE;

  case 's': *glyph = 3; return TRUE;

  }

  return FALSE;

}

static hb_position_t

glyph_h_kerning_func (hb_font_t *font, void *font_data,

		      hb_codepoint_t left, hb_codepoint_t right,

		      void *user_data)

{

  if (left == 1 && right == 2)

    return -2;

  return 0;

}

static const char TesT[] = "TesT";

static void

test_shape (void)

{

  hb_blob_t *blob;

  hb_face_t *face;

  hb_font_funcs_t *ffuncs;

  hb_font_t *font;

  hb_buffer_t *buffer;

  unsigned int len;

  hb_glyph_info_t *glyphs;

  hb_glyph_position_t *positions;

  blob = hb_blob_create (test_data, sizeof (test_data), HB_MEMORY_MODE_READONLY, NULL, NULL);

  face = hb_face_create (blob, 0);

  hb_blob_destroy (blob);

  font = hb_font_create (face);

  hb_face_destroy (face);

  hb_font_set_scale (font, 10, 10);

  ffuncs = hb_font_funcs_create ();

  hb_font_funcs_set_glyph_h_advance_func (ffuncs, glyph_h_advance_func, NULL, NULL);

  hb_font_funcs_set_glyph_func (ffuncs, glyph_func, malloc (10), free);

  hb_font_funcs_set_glyph_h_kerning_func (ffuncs, glyph_h_kerning_func, NULL, NULL);

  hb_font_set_funcs (font, ffuncs, NULL, NULL);

  hb_font_funcs_destroy (ffuncs);

  buffer =  hb_buffer_create ();

  hb_buffer_set_direction (buffer, HB_DIRECTION_LTR);

  hb_buffer_add_utf8 (buffer, TesT, 4, 0, 4);

  hb_shape (font, buffer, NULL, 0);

  len = hb_buffer_get_length (buffer);

  glyphs = hb_buffer_get_glyph_infos (buffer, NULL);

  positions = hb_buffer_get_glyph_positions (buffer, NULL);

  {

    const hb_codepoint_t output_glyphs[] = {1, 2, 3, 1};

    const hb_position_t output_x_advances[] = {9, 5, 5, 10};

    const hb_position_t output_x_offsets[] = {0, -1, 0, 0};

    unsigned int i;

    g_assert_cmpint (len, ==, 4);

    for (i = 0; i < len; i++) {

      g_assert_cmphex (glyphs[i].codepoint, ==, output_glyphs[i]);

      g_assert_cmphex (glyphs[i].cluster,   ==, i);

    }

    for (i = 0; i < len; i++) {

      g_assert_cmpint (output_x_advances[i], ==, positions[i].x_advance);

      g_assert_cmpint (output_x_offsets [i], ==, positions[i].x_offset);

      g_assert_cmpint (0, ==, positions[i].y_advance);

      g_assert_cmpint (0, ==, positions[i].y_offset);

    }

  }

  hb_buffer_destroy (buffer);

  hb_font_destroy (font);

}

static void

test_shape_clusters (void)

{

  hb_face_t *face;

  hb_font_t *font;

  hb_buffer_t *buffer;

  unsigned int len;

  hb_glyph_info_t *glyphs;

  face = hb_face_create (NULL, 0);

  font = hb_font_create (face);

  hb_face_destroy (face);

  buffer =  hb_buffer_create ();

  hb_buffer_set_direction (buffer, HB_DIRECTION_LTR);

  {

    /* https://code.google.com/p/chromium/issues/detail?id=497578 */

    hb_codepoint_t test[] = {0xFFF1, 0xF0B6};

    hb_buffer_add_utf32 (buffer, test, 2, 0, 2);

  }

  hb_shape (font, buffer, NULL, 0);

  len = hb_buffer_get_length (buffer);

  glyphs = hb_buffer_get_glyph_infos (buffer, NULL);

  {

    const hb_codepoint_t output_glyphs[] = {0};

    const hb_position_t output_clusters[] = {0};

    unsigned int i;

    g_assert_cmpint (len, ==, 1);

    for (i = 0; i < len; i++) {

      g_assert_cmphex (glyphs[i].codepoint, ==, output_glyphs[i]);

      g_assert_cmphex (glyphs[i].cluster,   ==, output_clusters[i]);

    }

  }

  hb_buffer_destroy (buffer);

  hb_font_destroy (font);

}

static void

test_shape_list (void)

{

  const char **shapers = hb_shape_list_shapers ();

  unsigned int i;

  for (i = 0; shapers[i]; i++)

    ;

  g_assert_cmpint (i, >, 1);

  g_assert (!strcmp (shapers[i - 1], "fallback"));

}

int

main (int argc, char **argv)

{

  hb_test_init (&argc, &argv);

  hb_test_add (test_shape);

  hb_test_add (test_shape_clusters);

  /* TODO test fallback shaper */

  /* TODO test shaper_full */

  hb_test_add (test_shape_list);

  return hb_test_run();

}