static bool paint_region(openslide_t *osr, cairo_t *cr,
int64_t x, int64_t y,
struct _openslide_level *level,
int32_t w, int32_t h,
GError **err) {
struct generic_tiff_ops_data *data = osr->data;
struct level *l = (struct level *) level;
bool success = false;
TIFF *tiff = _openslide_tiffcache_get(data->tc, err);
if (tiff == NULL) {
return false;
}
if (TIFFSetDirectory(tiff, l->tiffl.dir)) {
success = _openslide_grid_paint_region(l->grid, cr, tiff,
x / l->base.downsample,
y / l->base.downsample,
level, w, h,
err);
} else {
g_set_error(err, OPENSLIDE_ERROR, OPENSLIDE_ERROR_FAILED,
"Cannot set TIFF directory");
}
_openslide_tiffcache_put(data->tc, tiff);
return success;
}
static bool render_missing_tile(struct level *l,
TIFF *tiff,
uint32_t *dest,
int64_t tile_col, int64_t tile_row,
GError **err) {
bool success = true;
int64_t tw = l->tiffl.tile_w;
int64_t th = l->tiffl.tile_h;
// always fill with transparent (needed for SATURATE)
memset(dest, 0, tw * th * 4);
if (l->prev) {
// recurse into previous level
double relative_ds = l->prev->base.downsample / l->base.downsample;
cairo_surface_t *surface =
cairo_image_surface_create_for_data((unsigned char *) dest,
CAIRO_FORMAT_ARGB32,
tw, th, tw * 4);
cairo_t *cr = cairo_create(surface);
cairo_surface_destroy(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SATURATE);
cairo_translate(cr, -1, -1);
cairo_scale(cr, relative_ds, relative_ds);
// For the usual case that we are on a tile boundary in the previous
// level, extend the region by one pixel in each direction to ensure we
// paint the surrounding tiles. This reduces the visible seam that
// would otherwise occur with non-integer downsamples.
success = _openslide_grid_paint_region(l->prev->grid, cr, tiff,
(tile_col * tw - 1) / relative_ds,
(tile_row * th - 1) / relative_ds,
(struct _openslide_level *) l->prev,
ceil((tw + 2) / relative_ds),
ceil((th + 2) / relative_ds),
err);
if (success) {
success = _openslide_check_cairo_status(cr, err);
}
cairo_destroy(cr);
}
return success;
}
static bool paint_region(openslide_t *osr, cairo_t *cr,
int64_t x, int64_t y,
struct _openslide_level *level,
int32_t w, int32_t h,
GError **err) {
struct aperio_ops_data *data = osr->data;
struct level *l = (struct level *) level;
TIFF *tiff = _openslide_tiffcache_get(data->tc, err);
if (tiff == NULL) {
return false;
}
bool success = _openslide_grid_paint_region(l->grid, cr, tiff,
x / l->base.downsample,
y / l->base.downsample,
level, w, h,
err);
_openslide_tiffcache_put(data->tc, tiff);
return success;
}
