static GeglTile *
get_tile (GeglTileSource *gegl_tile_source,
gint x,
gint y,
gint z)
{
GeglTileSource *source = ((GeglTileHandler *) gegl_tile_source)->source;
GeglTileHandlerZoom *zoom = (GeglTileHandlerZoom *) gegl_tile_source;
GeglTile *tile = NULL;
const Babl *format = gegl_tile_backend_get_format (zoom->backend);
GeglTileStorage *tile_storage;
gint tile_width;
gint tile_height;
gint tile_size;
if (source)
tile = gegl_tile_source_get_tile (source, x, y, z);
if (tile)
return tile;
if (z == 0)/* at base level with no tile found->send null, and shared empty
tile will be used instead */
{
return NULL;
}
tile_storage = _gegl_tile_handler_get_tile_storage ((GeglTileHandler *) zoom);
if (z > tile_storage->seen_zoom)
tile_storage->seen_zoom = z;
g_object_get (zoom->backend,
"tile-width", &tile_width,
"tile-height", &tile_height,
"tile-size", &tile_size,
NULL);
{
gint i, j;
GeglTile *source_tile[2][2] = { { NULL, NULL }, { NULL, NULL } };
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
/* we get the tile from ourselves, to make successive rescales work
* correctly */
source_tile[i][j] = gegl_tile_source_get_tile (gegl_tile_source,
x * 2 + i, y * 2 + j, z - 1);
}
if (source_tile[0][0] == NULL &&
source_tile[0][1] == NULL &&
source_tile[1][0] == NULL &&
source_tile[1][1] == NULL)
{
return NULL; /* no data from level below, return NULL and let GeglTileHandlerEmpty
fill in the shared empty tile */
}
g_assert (tile == NULL);
tile = gegl_tile_handler_create_tile (GEGL_TILE_HANDLER (zoom), x, y, z);
gegl_tile_lock (tile);
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
if (source_tile[i][j])
{
set_half (tile, source_tile[i][j], tile_width, tile_height, format, i, j);
gegl_tile_unref (source_tile[i][j]);
}
else
{
set_blank (tile, tile_width, tile_height, format, i, j);
}
}
gegl_tile_unlock (tile);
}
return tile;
}
static GeglTile *
gimp_tile_handler_projection_validate (GeglTileSource *source,
GeglTile *tile,
gint x,
gint y)
{
GimpTileHandlerProjection *projection;
cairo_region_t *tile_region;
cairo_rectangle_int_t tile_rect;
projection = GIMP_TILE_HANDLER_PROJECTION (source);
if (cairo_region_is_empty (projection->dirty_region))
return tile;
tile_region = cairo_region_copy (projection->dirty_region);
tile_rect.x = x * projection->tile_width;
tile_rect.y = y * projection->tile_height;
tile_rect.width = projection->tile_width;
tile_rect.height = projection->tile_height;
cairo_region_intersect_rectangle (tile_region, &tile_rect);
if (! cairo_region_is_empty (tile_region))
{
gint tile_bpp;
gint tile_stride;
gint n_rects;
gint i;
if (! tile)
tile = gegl_tile_handler_create_tile (GEGL_TILE_HANDLER (source),
x, y, 0);
cairo_region_subtract_rectangle (projection->dirty_region, &tile_rect);
tile_bpp = babl_format_get_bytes_per_pixel (projection->format);
tile_stride = tile_bpp * projection->tile_width;
gegl_tile_lock (tile);
n_rects = cairo_region_num_rectangles (tile_region);
#if 0
g_printerr ("%d ", n_rects);
#endif
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t blit_rect;
cairo_region_get_rectangle (tile_region, i, &blit_rect);
#if 0
g_printerr ("constructing projection at %d %d %d %d\n",
blit_rect.x,
blit_rect.y,
blit_rect.width,
blit_rect.height);
#endif
gegl_node_blit (projection->graph, 1.0,
GEGL_RECTANGLE (blit_rect.x,
blit_rect.y,
blit_rect.width,
blit_rect.height),
projection->format,
gegl_tile_get_data (tile) +
(blit_rect.y % projection->tile_height) * tile_stride +
(blit_rect.x % projection->tile_width) * tile_bpp,
tile_stride,
GEGL_ABYSS_NONE);
}
gegl_tile_unlock (tile);
}
cairo_region_destroy (tile_region);
return tile;
}
