test/scaling-helpers-test.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include "utils.h"
   5 #include "pixman-inlines.h"
   6
   7 /* A trivial reference implementation for
   8  * 'bilinear_pad_repeat_get_scanline_bounds'
   9  */
  10 static void
  11 bilinear_pad_repeat_get_scanline_bounds_ref (int32_t        source_image_width,
  12                                              pixman_fixed_t vx_,
  13                                              pixman_fixed_t unit_x,
  14                                              int32_t *      left_pad,
  15                                              int32_t *      left_tz,
  16                                              int32_t *      width,
  17                                              int32_t *      right_tz,
  18                                              int32_t *      right_pad)
  19 {
  20     int w = *width;
  21     int64_t vx = vx_;
  22     *left_pad = 0;
  23     *left_tz = 0;
  24     *width = 0;
  25     *right_tz = 0;
  26     *right_pad = 0;
  27     while (--w >= 0)
  28     {
  29         if (vx < 0)
  30         {
  31             if (vx + pixman_fixed_1 < 0)
  32                 *left_pad += 1;
  33             else
  34                 *left_tz += 1;
  35         }
  36         else if (vx + pixman_fixed_1 >= pixman_int_to_fixed (source_image_width))
  37         {
  38             if (vx >= pixman_int_to_fixed (source_image_width))
  39                 *right_pad += 1;
  40             else
  41                 *right_tz += 1;
  42         }
  43         else
  44         {
  45             *width += 1;
  46         }
  47         vx += unit_x;
  48     }
  49 }
  50
  51 int
  52 main (void)
  53 {
  54     int i;
  55     for (i = 0; i < 10000; i++)
  56     {
  57         int32_t left_pad1, left_tz1, width1, right_tz1, right_pad1;
  58         int32_t left_pad2, left_tz2, width2, right_tz2, right_pad2;
  59         pixman_fixed_t vx = lcg_rand_N(10000 << 16) - (3000 << 16);
  60         int32_t width = lcg_rand_N(10000);
  61         int32_t source_image_width = lcg_rand_N(10000) + 1;
  62         pixman_fixed_t unit_x = lcg_rand_N(10 << 16) + 1;
  63         width1 = width2 = width;
  64
  65         bilinear_pad_repeat_get_scanline_bounds_ref (source_image_width,
  66                                                      vx,
  67                                                      unit_x,
  68                                                      &left_pad1,
  69                                                      &left_tz1,
  70                                                      &width1,
  71                                                      &right_tz1,
  72                                                      &right_pad1);
  73
  74         bilinear_pad_repeat_get_scanline_bounds (source_image_width,
  75                                                  vx,
  76                                                  unit_x,
  77                                                  &left_pad2,
  78                                                  &left_tz2,
  79                                                  &width2,
  80                                                  &right_tz2,
  81                                                  &right_pad2);
  82
  83         assert (left_pad1 == left_pad2);
  84         assert (left_tz1 == left_tz2);
  85         assert (width1 == width2);
  86         assert (right_tz1 == right_tz2);
  87         assert (right_pad1 == right_pad2);
  88     }
  89
  90     return 0;
  91 }