test/swfdec_test_image.c

   1 /* Swfdec
   2  * Copyright (C) 2007 Benjamin Otte <otte@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "swfdec_test_image.h"
  25 #include "swfdec_test_function.h"
  26 #include "swfdec_test_utils.h"
  27
  28 #define SWFDEC_TEST_IMAGE_IS_VALID(image) ((image)->surface && \
  29     cairo_surface_status ((image)->surface) == CAIRO_STATUS_SUCCESS)
  30
  31 SwfdecTestImage *
  32 swfdec_test_image_new (SwfdecAsContext *context, guint width, guint height)
  33 {
  34   SwfdecTestImage *ret;
  35   SwfdecAsObject *object;
  36
  37   ret = g_object_new (SWFDEC_TYPE_TEST_IMAGE, "context", context, NULL);
  38   ret->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
  39
  40   object = swfdec_as_object_new (context, NULL);
  41   swfdec_as_object_set_constructor_by_name (object,
  42       swfdec_as_context_get_string (context, "Image"), NULL);
  43   swfdec_as_object_set_relay (object, SWFDEC_AS_RELAY (ret));
  44
  45   return ret;
  46 }
  47
  48 /*** SWFDEC_TEST_IMAGE ***/
  49
  50 G_DEFINE_TYPE (SwfdecTestImage, swfdec_test_image, SWFDEC_TYPE_AS_RELAY)
  51
  52 static void
  53 swfdec_test_image_dispose (GObject *object)
  54 {
  55   SwfdecTestImage *image = SWFDEC_TEST_IMAGE (object);
  56
  57   if (image->surface) {
  58     cairo_surface_destroy (image->surface);
  59     image->surface = NULL;
  60   }
  61
  62   G_OBJECT_CLASS (swfdec_test_image_parent_class)->dispose (object);
  63 }
  64
  65 static void
  66 swfdec_test_image_class_init (SwfdecTestImageClass *klass)
  67 {
  68   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  69
  70   object_class->dispose = swfdec_test_image_dispose;
  71 }
  72
  73 static void
  74 swfdec_test_image_init (SwfdecTestImage *this)
  75 {
  76 }
  77
  78 /*** AS CODE ***/
  79
  80 /* Compare two buffers, returning the number of pixels that are
  81  * different and the maximum difference of any single color channel in
  82  * result_ret.
  83  *
  84  * This function should be rewritten to compare all formats supported by
  85  * cairo_format_t instead of taking a mask as a parameter.
  86  */
  87 static gboolean
  88 buffer_diff_core (unsigned char *buf_a,
  89                   unsigned char *buf_b,
  90                   unsigned char *buf_diff,
  91                   int           width,
  92                   int           height,
  93                   int           stride_a,
  94                   int           stride_b,
  95                   int           stride_diff)
  96 {
  97     int x, y;
  98     gboolean result = TRUE;
  99     guint32 *row_a, *row_b, *row;
 100
 101     for (y = 0; y < height; y++) {
 102         row_a = (guint32 *) (buf_a + y * stride_a);
 103         row_b = (guint32 *) (buf_b + y * stride_b);
 104         row = (guint32 *) (buf_diff + y * stride_diff);
 105         for (x = 0; x < width; x++) {
 106             /* check if the pixels are the same */
 107             if (row_a[x] != row_b[x]) {
 108                 int channel;
 109                 static const unsigned int threshold = 3;
 110                 guint32 diff_pixel = 0;
 111
 112                 /* calculate a difference value for all 4 channels */
 113                 for (channel = 0; channel < 4; channel++) {
 114                     int value_a = (row_a[x] >> (channel*8)) & 0xff;
 115                     int value_b = (row_b[x] >> (channel*8)) & 0xff;
 116                     unsigned int diff;
 117                     diff = ABS (value_a - value_b);
 118                     if (diff <= threshold)
 119                       continue;
 120                     diff *= 4;  /* emphasize */
 121                     diff += 128; /* make sure it's visible */
 122                     if (diff > 255)
 123                         diff = 255;
 124                     diff_pixel |= diff << (channel*8);
 125                 }
 126
 127                 row[x] = diff_pixel;
 128                 if (diff_pixel)
 129                   result = FALSE;
 130             } else {
 131                 row[x] = 0;
 132             }
 133             row[x] |= 0xff000000; /* Set ALPHA to 100% (opaque) */
 134         }
 135     }
 136     return result;
 137 }
 138
 139 SWFDEC_TEST_FUNCTION ("Image_compare", swfdec_test_image_compare)
 140 void
 141 swfdec_test_image_compare (SwfdecAsContext *cx, SwfdecAsObject *object, guint argc,
 142     SwfdecAsValue *argv, SwfdecAsValue *retval)
 143 {
 144   SwfdecTestImage *image, *compare, *diff;
 145   SwfdecAsObject *o;
 146   int w, h;
 147
 148   SWFDEC_AS_CHECK (SWFDEC_TYPE_TEST_IMAGE, &image, "o", &o);
 149
 150   if (!SWFDEC_IS_TEST_IMAGE (o->relay))
 151     return;
 152   compare = SWFDEC_TEST_IMAGE (o->relay);
 153
 154   SWFDEC_AS_VALUE_SET_OBJECT (retval, swfdec_as_relay_get_as_object (SWFDEC_AS_RELAY (image)));
 155   if (!SWFDEC_TEST_IMAGE_IS_VALID (image) ||
 156       !SWFDEC_TEST_IMAGE_IS_VALID (compare))
 157     return;
 158
 159   g_assert (cairo_surface_get_type (image->surface) == CAIRO_SURFACE_TYPE_IMAGE);
 160   g_assert (cairo_surface_get_type (compare->surface) == CAIRO_SURFACE_TYPE_IMAGE);
 161
 162   w = cairo_image_surface_get_width (image->surface);
 163   if (w != cairo_image_surface_get_width (compare->surface))
 164     return;
 165   h = cairo_image_surface_get_height (image->surface);
 166   if (h != cairo_image_surface_get_height (compare->surface))
 167     return;
 168   diff = SWFDEC_TEST_IMAGE (swfdec_test_image_new (cx, w, h));
 169
 170   if (!buffer_diff_core (cairo_image_surface_get_data (image->surface),
 171         cairo_image_surface_get_data (compare->surface),
 172         cairo_image_surface_get_data (diff->surface),
 173         w, h,
 174         cairo_image_surface_get_stride (image->surface),
 175         cairo_image_surface_get_stride (compare->surface),
 176         cairo_image_surface_get_stride (diff->surface)) != 0) {
 177     SWFDEC_AS_VALUE_SET_OBJECT (retval, SWFDEC_AS_OBJECT (diff));
 178   } else {
 179     SWFDEC_AS_VALUE_SET_NULL (retval);
 180   }
 181 }
 182
 183 SWFDEC_TEST_FUNCTION ("Image_save", swfdec_test_image_save)
 184 void
 185 swfdec_test_image_save (SwfdecAsContext *cx, SwfdecAsObject *object, guint argc,
 186     SwfdecAsValue *argv, SwfdecAsValue *retval)
 187 {
 188   SwfdecTestImage *image;
 189   const char *filename;
 190   cairo_status_t status;
 191
 192   SWFDEC_AS_CHECK (SWFDEC_TYPE_TEST_IMAGE, &image, "s", &filename);
 193
 194   SWFDEC_AS_VALUE_SET_BOOLEAN (retval, FALSE);
 195   if (!SWFDEC_TEST_IMAGE_IS_VALID (image))
 196     return;
 197
 198   status = cairo_surface_write_to_png (image->surface, filename);
 199   if (status != CAIRO_STATUS_SUCCESS) {
 200     swfdec_test_throw (cx, "Couldn't save to %s: %s", filename, cairo_status_to_string (status));
 201   }
 202
 203   SWFDEC_AS_VALUE_SET_BOOLEAN (retval, TRUE);
 204 }
 205
 206 SWFDEC_TEST_FUNCTION ("Image", swfdec_test_image_create)
 207 void
 208 swfdec_test_image_create (SwfdecAsContext *cx, SwfdecAsObject *object, guint argc,
 209     SwfdecAsValue *argv, SwfdecAsValue *retval)
 210 {
 211   SwfdecTestImage *image;
 212   const char *filename;
 213
 214   if (!swfdec_as_context_is_constructing (cx))
 215     return;
 216
 217   SWFDEC_AS_CHECK (0, NULL, "s", &filename);
 218
 219   image = g_object_new (SWFDEC_TYPE_TEST_IMAGE, "context", cx, NULL);
 220   image->surface = cairo_image_surface_create_from_png (filename);
 221
 222   swfdec_as_object_set_relay (object, SWFDEC_AS_RELAY (image));
 223   SWFDEC_AS_VALUE_SET_OBJECT (retval, object);
 224 }
 225