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-rw-r--r--app/gegl/gimptilehandlervalidate.c766
1 files changed, 766 insertions, 0 deletions
diff --git a/app/gegl/gimptilehandlervalidate.c b/app/gegl/gimptilehandlervalidate.c
new file mode 100644
index 0000000..01915d5
--- /dev/null
+++ b/app/gegl/gimptilehandlervalidate.c
@@ -0,0 +1,766 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+
+#include "gimp-gegl-types.h"
+
+#include "core/gimpchunkiterator.h"
+#include "core/gimpmarshal.h"
+
+#include "gimp-gegl-loops.h"
+#include "gimp-gegl-utils.h"
+#include "gimptilehandlervalidate.h"
+
+
+enum
+{
+ INVALIDATED,
+ LAST_SIGNAL
+};
+
+enum
+{
+ PROP_0,
+ PROP_FORMAT,
+ PROP_TILE_WIDTH,
+ PROP_TILE_HEIGHT,
+ PROP_WHOLE_TILE
+};
+
+
+static void gimp_tile_handler_validate_finalize (GObject *object);
+static void gimp_tile_handler_validate_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_tile_handler_validate_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_tile_handler_validate_real_begin_validate (GimpTileHandlerValidate *validate);
+static void gimp_tile_handler_validate_real_end_validate (GimpTileHandlerValidate *validate);
+static void gimp_tile_handler_validate_real_validate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer dest_buf,
+ gint dest_stride);
+static void gimp_tile_handler_validate_real_validate_buffer (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ GeglBuffer *buffer);
+
+static gpointer gimp_tile_handler_validate_command (GeglTileSource *source,
+ GeglTileCommand command,
+ gint x,
+ gint y,
+ gint z,
+ gpointer data);
+
+
+G_DEFINE_TYPE (GimpTileHandlerValidate, gimp_tile_handler_validate,
+ GEGL_TYPE_TILE_HANDLER)
+
+#define parent_class gimp_tile_handler_validate_parent_class
+
+static guint gimp_tile_handler_validate_signals[LAST_SIGNAL];
+
+
+static void
+gimp_tile_handler_validate_class_init (GimpTileHandlerValidateClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ gimp_tile_handler_validate_signals[INVALIDATED] =
+ g_signal_new ("invalidated",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpTileHandlerValidateClass, invalidated),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__BOXED,
+ G_TYPE_NONE, 1,
+ GEGL_TYPE_RECTANGLE);
+
+ object_class->finalize = gimp_tile_handler_validate_finalize;
+ object_class->set_property = gimp_tile_handler_validate_set_property;
+ object_class->get_property = gimp_tile_handler_validate_get_property;
+
+ klass->begin_validate = gimp_tile_handler_validate_real_begin_validate;
+ klass->end_validate = gimp_tile_handler_validate_real_end_validate;
+ klass->validate = gimp_tile_handler_validate_real_validate;
+ klass->validate_buffer = gimp_tile_handler_validate_real_validate_buffer;
+
+ g_object_class_install_property (object_class, PROP_FORMAT,
+ g_param_spec_pointer ("format", NULL, NULL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_TILE_WIDTH,
+ g_param_spec_int ("tile-width", NULL, NULL,
+ 1, G_MAXINT, 1,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_TILE_HEIGHT,
+ g_param_spec_int ("tile-height", NULL, NULL,
+ 1, G_MAXINT, 1,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_WHOLE_TILE,
+ g_param_spec_boolean ("whole-tile", NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_tile_handler_validate_init (GimpTileHandlerValidate *validate)
+{
+ GeglTileSource *source = GEGL_TILE_SOURCE (validate);
+
+ source->command = gimp_tile_handler_validate_command;
+
+ validate->dirty_region = cairo_region_create ();
+}
+
+static void
+gimp_tile_handler_validate_finalize (GObject *object)
+{
+ GimpTileHandlerValidate *validate = GIMP_TILE_HANDLER_VALIDATE (object);
+
+ g_clear_object (&validate->graph);
+ g_clear_pointer (&validate->dirty_region, cairo_region_destroy);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_tile_handler_validate_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpTileHandlerValidate *validate = GIMP_TILE_HANDLER_VALIDATE (object);
+
+ switch (property_id)
+ {
+ case PROP_FORMAT:
+ validate->format = g_value_get_pointer (value);
+ break;
+ case PROP_TILE_WIDTH:
+ validate->tile_width = g_value_get_int (value);
+ break;
+ case PROP_TILE_HEIGHT:
+ validate->tile_height = g_value_get_int (value);
+ break;
+ case PROP_WHOLE_TILE:
+ validate->whole_tile = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_tile_handler_validate_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpTileHandlerValidate *validate = GIMP_TILE_HANDLER_VALIDATE (object);
+
+ switch (property_id)
+ {
+ case PROP_FORMAT:
+ g_value_set_pointer (value, (gpointer) validate->format);
+ break;
+ case PROP_TILE_WIDTH:
+ g_value_set_int (value, validate->tile_width);
+ break;
+ case PROP_TILE_HEIGHT:
+ g_value_set_int (value, validate->tile_height);
+ break;
+ case PROP_WHOLE_TILE:
+ g_value_set_boolean (value, validate->whole_tile);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_tile_handler_validate_real_begin_validate (GimpTileHandlerValidate *validate)
+{
+ validate->suspend_validate++;
+}
+
+static void
+gimp_tile_handler_validate_real_end_validate (GimpTileHandlerValidate *validate)
+{
+ validate->suspend_validate--;
+}
+
+static void
+gimp_tile_handler_validate_real_validate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer dest_buf,
+ gint dest_stride)
+{
+#if 0
+ g_printerr ("validating at %d %d %d %d\n",
+ rect.x,
+ rect.y,
+ rect.width,
+ rect.height);
+#endif
+
+ gegl_node_blit (validate->graph, 1.0, rect, format,
+ dest_buf, dest_stride,
+ GEGL_BLIT_DEFAULT);
+}
+
+static void
+gimp_tile_handler_validate_real_validate_buffer (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ GeglBuffer *buffer)
+{
+ GimpTileHandlerValidateClass *klass;
+
+ klass = GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate);
+
+ if (klass->validate == gimp_tile_handler_validate_real_validate)
+ {
+ gegl_node_blit_buffer (validate->graph, buffer, rect, 0,
+ GEGL_ABYSS_NONE);
+ }
+ else
+ {
+ const Babl *format = gegl_buffer_get_format (buffer);
+ gpointer data;
+ gint stride;
+
+ data = gegl_buffer_linear_open (buffer, rect, &stride, format);
+
+ klass->validate (validate, rect, format, data, stride);
+
+ gegl_buffer_linear_close (buffer, data);
+ }
+}
+
+static GeglTile *
+gimp_tile_handler_validate_validate_tile (GeglTileSource *source,
+ gint x,
+ gint y)
+{
+ GimpTileHandlerValidate *validate = GIMP_TILE_HANDLER_VALIDATE (source);
+ GeglTile *tile;
+ cairo_rectangle_int_t tile_rect;
+ cairo_region_overlap_t overlap;
+
+ if (validate->suspend_validate ||
+ cairo_region_is_empty (validate->dirty_region))
+ {
+ return gegl_tile_handler_source_command (source,
+ GEGL_TILE_GET, x, y, 0, NULL);
+ }
+
+ tile_rect.x = x * validate->tile_width;
+ tile_rect.y = y * validate->tile_height;
+ tile_rect.width = validate->tile_width;
+ tile_rect.height = validate->tile_height;
+
+ overlap = cairo_region_contains_rectangle (validate->dirty_region,
+ &tile_rect);
+
+ if (overlap == CAIRO_REGION_OVERLAP_OUT)
+ {
+ return gegl_tile_handler_source_command (source,
+ GEGL_TILE_GET, x, y, 0, NULL);
+ }
+
+ if (overlap == CAIRO_REGION_OVERLAP_IN || validate->whole_tile)
+ {
+ gint tile_bpp;
+ gint tile_stride;
+
+ cairo_region_subtract_rectangle (validate->dirty_region, &tile_rect);
+
+ tile_bpp = babl_format_get_bytes_per_pixel (validate->format);
+ tile_stride = tile_bpp * validate->tile_width;
+
+ tile = gegl_tile_handler_get_source_tile (GEGL_TILE_HANDLER (source),
+ x, y, 0, FALSE);
+
+ gimp_tile_handler_validate_begin_validate (validate);
+
+ gegl_tile_lock (tile);
+
+ GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate)->validate
+ (validate,
+ GEGL_RECTANGLE (tile_rect.x,
+ tile_rect.y,
+ tile_rect.width,
+ tile_rect.height),
+ validate->format,
+ gegl_tile_get_data (tile),
+ tile_stride);
+
+ gegl_tile_unlock (tile);
+
+ gimp_tile_handler_validate_end_validate (validate);
+ }
+ else
+ {
+ cairo_region_t *tile_region;
+ gint tile_bpp;
+ gint tile_stride;
+ gint n_rects;
+ gint i;
+
+ tile_region = cairo_region_copy (validate->dirty_region);
+ cairo_region_intersect_rectangle (tile_region, &tile_rect);
+
+ cairo_region_subtract_rectangle (validate->dirty_region, &tile_rect);
+
+ tile_bpp = babl_format_get_bytes_per_pixel (validate->format);
+ tile_stride = tile_bpp * validate->tile_width;
+
+ tile = gegl_tile_handler_source_command (source,
+ GEGL_TILE_GET, x, y, 0, NULL);
+
+ if (! tile)
+ {
+ tile = gegl_tile_handler_create_tile (GEGL_TILE_HANDLER (source),
+ x, y, 0);
+
+ memset (gegl_tile_get_data (tile),
+ 0, tile_stride * validate->tile_height);
+ }
+
+ gimp_tile_handler_validate_begin_validate (validate);
+
+ gegl_tile_lock (tile);
+
+ n_rects = cairo_region_num_rectangles (tile_region);
+
+#if 0
+ g_printerr ("%d chunks\n", n_rects);
+#endif
+
+ for (i = 0; i < n_rects; i++)
+ {
+ cairo_rectangle_int_t blit_rect;
+ gint tile_x;
+ gint tile_y;
+
+ cairo_region_get_rectangle (tile_region, i, &blit_rect);
+
+ tile_x = blit_rect.x % validate->tile_width;
+ if (tile_x < 0) tile_x += validate->tile_width;
+
+ tile_y = blit_rect.y % validate->tile_height;
+ if (tile_y < 0) tile_y += validate->tile_height;
+
+ GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate)->validate
+ (validate,
+ GEGL_RECTANGLE (blit_rect.x,
+ blit_rect.y,
+ blit_rect.width,
+ blit_rect.height),
+ validate->format,
+ gegl_tile_get_data (tile) +
+ tile_y * tile_stride +
+ tile_x * tile_bpp,
+ tile_stride);
+ }
+
+ gegl_tile_unlock (tile);
+
+ gimp_tile_handler_validate_end_validate (validate);
+
+ cairo_region_destroy (tile_region);
+ }
+
+ return tile;
+}
+
+static gpointer
+gimp_tile_handler_validate_command (GeglTileSource *source,
+ GeglTileCommand command,
+ gint x,
+ gint y,
+ gint z,
+ gpointer data)
+{
+ if (command == GEGL_TILE_GET && z == 0)
+ return gimp_tile_handler_validate_validate_tile (source, x, y);
+
+ return gegl_tile_handler_source_command (source, command, x, y, z, data);
+}
+
+
+/* public functions */
+
+GeglTileHandler *
+gimp_tile_handler_validate_new (GeglNode *graph)
+{
+ GimpTileHandlerValidate *validate;
+
+ g_return_val_if_fail (GEGL_IS_NODE (graph), NULL);
+
+ validate = g_object_new (GIMP_TYPE_TILE_HANDLER_VALIDATE, NULL);
+
+ validate->graph = g_object_ref (graph);
+
+ return GEGL_TILE_HANDLER (validate);
+}
+
+void
+gimp_tile_handler_validate_assign (GimpTileHandlerValidate *validate,
+ GeglBuffer *buffer)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (GEGL_IS_BUFFER (buffer));
+ g_return_if_fail (gimp_tile_handler_validate_get_assigned (buffer) == NULL);
+
+ gegl_buffer_add_handler (buffer, validate);
+
+ g_object_get (buffer,
+ "format", &validate->format,
+ "tile-width", &validate->tile_width,
+ "tile-height", &validate->tile_height,
+ NULL);
+
+ g_object_set_data (G_OBJECT (buffer),
+ "gimp-tile-handler-validate", validate);
+}
+
+void
+gimp_tile_handler_validate_unassign (GimpTileHandlerValidate *validate,
+ GeglBuffer *buffer)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (GEGL_IS_BUFFER (buffer));
+ g_return_if_fail (gimp_tile_handler_validate_get_assigned (buffer) == validate);
+
+ g_object_set_data (G_OBJECT (buffer),
+ "gimp-tile-handler-validate", NULL);
+
+ gegl_buffer_remove_handler (buffer, validate);
+}
+
+GimpTileHandlerValidate *
+gimp_tile_handler_validate_get_assigned (GeglBuffer *buffer)
+{
+ g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
+
+ return g_object_get_data (G_OBJECT (buffer),
+ "gimp-tile-handler-validate");
+}
+
+void
+gimp_tile_handler_validate_invalidate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (rect != NULL);
+
+ cairo_region_union_rectangle (validate->dirty_region,
+ (cairo_rectangle_int_t *) rect);
+
+ gegl_tile_handler_damage_rect (GEGL_TILE_HANDLER (validate), rect);
+
+ g_signal_emit (validate, gimp_tile_handler_validate_signals[INVALIDATED],
+ 0, rect, NULL);
+}
+
+void
+gimp_tile_handler_validate_undo_invalidate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (rect != NULL);
+
+ cairo_region_subtract_rectangle (validate->dirty_region,
+ (cairo_rectangle_int_t *) rect);
+}
+
+void
+gimp_tile_handler_validate_begin_validate (GimpTileHandlerValidate *validate)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+
+ if (validate->validating++ == 0)
+ GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate)->begin_validate (validate);
+}
+
+void
+gimp_tile_handler_validate_end_validate (GimpTileHandlerValidate *validate)
+{
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (validate->validating > 0);
+
+ if (--validate->validating == 0)
+ GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate)->end_validate (validate);
+}
+
+void
+gimp_tile_handler_validate_validate (GimpTileHandlerValidate *validate,
+ GeglBuffer *buffer,
+ const GeglRectangle *rect,
+ gboolean intersect,
+ gboolean chunked)
+{
+ GimpTileHandlerValidateClass *klass;
+ cairo_region_t *region = NULL;
+
+ g_return_if_fail (GIMP_IS_TILE_HANDLER_VALIDATE (validate));
+ g_return_if_fail (gimp_tile_handler_validate_get_assigned (buffer) ==
+ validate);
+
+ klass = GIMP_TILE_HANDLER_VALIDATE_GET_CLASS (validate);
+
+ if (! rect)
+ rect = gegl_buffer_get_extent (buffer);
+
+ if (intersect)
+ {
+ region = cairo_region_copy (validate->dirty_region);
+
+ cairo_region_intersect_rectangle (region,
+ (const cairo_rectangle_int_t *) rect);
+ }
+ else if (chunked)
+ {
+ region = cairo_region_create_rectangle (
+ (const cairo_rectangle_int_t *) rect);
+ }
+
+ if (region)
+ {
+ if (! cairo_region_is_empty (region))
+ {
+ gimp_tile_handler_validate_begin_validate (validate);
+
+ if (chunked)
+ {
+ GimpChunkIterator *iter;
+
+ iter = gimp_chunk_iterator_new (region);
+ region = NULL;
+
+ while (gimp_chunk_iterator_next (iter))
+ {
+ GeglRectangle blit_rect;
+
+ while (gimp_chunk_iterator_get_rect (iter, &blit_rect))
+ klass->validate_buffer (validate, &blit_rect, buffer);
+ }
+ }
+ else
+ {
+ gint n_rects;
+ gint i;
+
+ n_rects = cairo_region_num_rectangles (region);
+
+ for (i = 0; i < n_rects; i++)
+ {
+ cairo_rectangle_int_t blit_rect;
+
+ cairo_region_get_rectangle (region, i, &blit_rect);
+
+ klass->validate_buffer (validate,
+ (const GeglRectangle *) &blit_rect,
+ buffer);
+ }
+ }
+
+ gimp_tile_handler_validate_end_validate (validate);
+
+ cairo_region_subtract_rectangle (
+ validate->dirty_region,
+ (const cairo_rectangle_int_t *) rect);
+ }
+
+ g_clear_pointer (&region, cairo_region_destroy);
+ }
+ else
+ {
+ gimp_tile_handler_validate_begin_validate (validate);
+
+ klass->validate_buffer (validate, rect, buffer);
+
+ gimp_tile_handler_validate_end_validate (validate);
+
+ cairo_region_subtract_rectangle (
+ validate->dirty_region,
+ (const cairo_rectangle_int_t *) rect);
+ }
+}
+
+gboolean
+gimp_tile_handler_validate_buffer_set_extent (GeglBuffer *buffer,
+ const GeglRectangle *extent)
+{
+ GimpTileHandlerValidate *validate;
+
+ g_return_val_if_fail (GEGL_IS_BUFFER (buffer), FALSE);
+ g_return_val_if_fail (extent != NULL, FALSE);
+
+ validate = gimp_tile_handler_validate_get_assigned (buffer);
+
+ g_return_val_if_fail (validate != NULL, FALSE);
+
+ validate->suspend_validate++;
+
+ if (gimp_gegl_buffer_set_extent (buffer, extent))
+ {
+ validate->suspend_validate--;
+
+ cairo_region_intersect_rectangle (validate->dirty_region,
+ (const cairo_rectangle_int_t *) extent);
+
+ return TRUE;
+ }
+
+ validate->suspend_validate--;
+
+ return FALSE;
+}
+
+void
+gimp_tile_handler_validate_buffer_copy (GeglBuffer *src_buffer,
+ const GeglRectangle *src_rect,
+ GeglBuffer *dst_buffer,
+ const GeglRectangle *dst_rect)
+{
+ GimpTileHandlerValidate *src_validate;
+ GimpTileHandlerValidate *dst_validate;
+ GeglRectangle real_src_rect;
+ GeglRectangle real_dst_rect;
+
+ g_return_if_fail (GEGL_IS_BUFFER (src_buffer));
+ g_return_if_fail (GEGL_IS_BUFFER (dst_buffer));
+ g_return_if_fail (src_rect != dst_rect);
+
+ src_validate = gimp_tile_handler_validate_get_assigned (src_buffer);
+ dst_validate = gimp_tile_handler_validate_get_assigned (dst_buffer);
+
+ g_return_if_fail (dst_validate != NULL);
+
+ if (! src_rect)
+ src_rect = gegl_buffer_get_extent (src_buffer);
+
+ if (! dst_rect)
+ dst_rect = src_rect;
+
+ real_src_rect = *src_rect;
+
+ gegl_rectangle_intersect (&real_dst_rect,
+ dst_rect, gegl_buffer_get_extent (dst_buffer));
+
+ real_src_rect.x += real_dst_rect.x - dst_rect->x;
+ real_src_rect.y += real_dst_rect.y - dst_rect->y;
+ real_src_rect.width -= real_dst_rect.x - dst_rect->x;
+ real_src_rect.height -= real_dst_rect.y - dst_rect->y;
+
+ real_src_rect.width = CLAMP (real_src_rect.width, 0, real_dst_rect.width);
+ real_src_rect.height = CLAMP (real_src_rect.height, 0, real_dst_rect.height);
+
+ /* temporarily remove the source buffer's validate handler, so that
+ * gegl_buffer_copy() can use fast tile copying, using the TILE_COPY command.
+ * currently, gegl only uses TILE_COPY when the source buffer has no user-
+ * provided tile handlers.
+ */
+ if (src_validate)
+ {
+ g_object_ref (src_validate);
+
+ gimp_tile_handler_validate_unassign (src_validate, src_buffer);
+ }
+
+ dst_validate->suspend_validate++;
+
+ gimp_gegl_buffer_copy (src_buffer, &real_src_rect, GEGL_ABYSS_NONE,
+ dst_buffer, &real_dst_rect);
+
+ dst_validate->suspend_validate--;
+
+ if (src_validate)
+ {
+ gimp_tile_handler_validate_assign (src_validate, src_buffer);
+
+ g_object_unref (src_validate);
+ }
+
+ cairo_region_subtract_rectangle (dst_validate->dirty_region,
+ (cairo_rectangle_int_t *) &real_dst_rect);
+
+ if (src_validate)
+ {
+ if (real_src_rect.x == real_dst_rect.x &&
+ real_src_rect.y == real_dst_rect.y &&
+ gegl_rectangle_equal (&real_src_rect,
+ gegl_buffer_get_extent (src_buffer)))
+ {
+ cairo_region_union (dst_validate->dirty_region,
+ src_validate->dirty_region);
+ }
+ else if (cairo_region_contains_rectangle (
+ src_validate->dirty_region,
+ (cairo_rectangle_int_t *) &real_src_rect) !=
+ CAIRO_REGION_OVERLAP_OUT)
+ {
+ cairo_region_t *region;
+
+ region = cairo_region_copy (src_validate->dirty_region);
+
+ if (! gegl_rectangle_equal (&real_src_rect,
+ gegl_buffer_get_extent (src_buffer)))
+ {
+ cairo_region_intersect_rectangle (
+ region, (cairo_rectangle_int_t *) &real_src_rect);
+ }
+
+ cairo_region_translate (region,
+ real_dst_rect.x - real_src_rect.x,
+ real_dst_rect.y - real_src_rect.y);
+
+ if (cairo_region_is_empty (dst_validate->dirty_region))
+ {
+ cairo_region_destroy (dst_validate->dirty_region);
+
+ dst_validate->dirty_region = region;
+ }
+ else
+ {
+ cairo_region_union (dst_validate->dirty_region, region);
+
+ cairo_region_destroy (region);
+ }
+ }
+ }
+}