diff options
Diffstat (limited to 'capplets/display/scrollarea.c')
| -rw-r--r-- | capplets/display/scrollarea.c | 1944 |
1 files changed, 1944 insertions, 0 deletions
diff --git a/capplets/display/scrollarea.c b/capplets/display/scrollarea.c new file mode 100644 index 00000000..9da2fb66 --- /dev/null +++ b/capplets/display/scrollarea.c @@ -0,0 +1,1944 @@ +/* Copyright 2006, 2007, 2008, Soren Sandmann <[email protected]> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include <gdk/gdkprivate.h> /* For GDK_PARENT_RELATIVE_BG */ +#include "scrollarea.h" +#include "foo-marshal.h" + +G_DEFINE_TYPE (FooScrollArea, foo_scroll_area, GTK_TYPE_CONTAINER); + +static GtkWidgetClass *parent_class; + +typedef struct BackingStore BackingStore; + +typedef void (* ExposeFunc) (cairo_t *cr, GdkRegion *region, gpointer data); + +#if 0 +static void backing_store_draw (BackingStore *store, + GdkDrawable *dest, + GdkRegion *clip, + int dest_x, + int dest_y); +static void backing_store_scroll (BackingStore *store, + int dx, int dy); +static void backing_store_invalidate_rect (BackingStore *store, + GdkRectangle *rect); +static void backing_store_invalidate_region (BackingStore *store, + GdkRegion *region); +static void backing_store_invalidate_all (BackingStore *store); +static BackingStore *backing_store_new (GdkWindow *window, + int width, int height); +static void backing_store_resize (BackingStore *store, + int width, int height); +static void backing_store_process_updates (BackingStore *store, + ExposeFunc func, + gpointer data); +static void backing_store_free (BackingStore *store); +#endif + +typedef struct InputPath InputPath; +typedef struct InputRegion InputRegion; +typedef struct AutoScrollInfo AutoScrollInfo; + +struct InputPath +{ + gboolean is_stroke; + cairo_fill_rule_t fill_rule; + double line_width; + cairo_path_t *path; /* In canvas coordinates */ + + FooScrollAreaEventFunc func; + gpointer data; + + InputPath *next; +}; + +/* InputRegions are mutually disjoint */ +struct InputRegion +{ + GdkRegion *region; /* the boundary of this area in canvas coordinates */ + InputPath *paths; +}; + +struct AutoScrollInfo +{ + int dx; + int dy; + int timeout_id; + int begin_x; + int begin_y; + double res_x; + double res_y; + GTimer *timer; +}; + +struct FooScrollAreaPrivate +{ + GdkWindow *input_window; + + int width; + int height; + + GtkAdjustment *hadj; + GtkAdjustment *vadj; + int x_offset; + int y_offset; + + int min_width; + int min_height; + + GPtrArray *input_regions; + + AutoScrollInfo *auto_scroll_info; + + /* During expose, this region is set to the region + * being exposed. At other times, it is NULL + * + * It is used for clipping of input areas + */ + GdkRegion *expose_region; + InputRegion *current_input; + + gboolean grabbed; + FooScrollAreaEventFunc grab_func; + gpointer grab_data; + + GdkPixmap *pixmap; + GdkRegion *update_region; /* In canvas coordinates */ +}; + +enum +{ + VIEWPORT_CHANGED, + PAINT, + INPUT, + LAST_SIGNAL, +}; + +static guint signals [LAST_SIGNAL] = { 0 }; + +static void foo_scroll_area_size_request (GtkWidget *widget, + GtkRequisition *requisition); +static gboolean foo_scroll_area_expose (GtkWidget *widget, + GdkEventExpose *expose); +static void foo_scroll_area_size_allocate (GtkWidget *widget, + GtkAllocation *allocation); +static void foo_scroll_area_set_scroll_adjustments (FooScrollArea *scroll_area, + GtkAdjustment *hadjustment, + GtkAdjustment *vadjustment); +static void foo_scroll_area_realize (GtkWidget *widget); +static void foo_scroll_area_unrealize (GtkWidget *widget); +static void foo_scroll_area_map (GtkWidget *widget); +static void foo_scroll_area_unmap (GtkWidget *widget); +static gboolean foo_scroll_area_button_press (GtkWidget *widget, + GdkEventButton *event); +static gboolean foo_scroll_area_button_release (GtkWidget *widget, + GdkEventButton *event); +static gboolean foo_scroll_area_motion (GtkWidget *widget, + GdkEventMotion *event); + +static void +foo_scroll_area_map (GtkWidget *widget) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + GTK_WIDGET_CLASS (parent_class)->map (widget); + + if (area->priv->input_window) + gdk_window_show (area->priv->input_window); +} + +static void +foo_scroll_area_unmap (GtkWidget *widget) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + if (area->priv->input_window) + gdk_window_hide (area->priv->input_window); + + GTK_WIDGET_CLASS (parent_class)->unmap (widget); +} + +static void +foo_scroll_area_finalize (GObject *object) +{ + FooScrollArea *scroll_area = FOO_SCROLL_AREA (object); + + g_object_unref (scroll_area->priv->hadj); + g_object_unref (scroll_area->priv->vadj); + + g_ptr_array_free (scroll_area->priv->input_regions, TRUE); + + g_free (scroll_area->priv); + + G_OBJECT_CLASS (foo_scroll_area_parent_class)->finalize (object); +} + +static void +foo_scroll_area_class_init (FooScrollAreaClass *class) +{ + GObjectClass *object_class = G_OBJECT_CLASS (class); + GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class); + + object_class->finalize = foo_scroll_area_finalize; + widget_class->size_request = foo_scroll_area_size_request; + widget_class->expose_event = foo_scroll_area_expose; + widget_class->size_allocate = foo_scroll_area_size_allocate; + widget_class->realize = foo_scroll_area_realize; + widget_class->unrealize = foo_scroll_area_unrealize; + widget_class->button_press_event = foo_scroll_area_button_press; + widget_class->button_release_event = foo_scroll_area_button_release; + widget_class->motion_notify_event = foo_scroll_area_motion; + widget_class->map = foo_scroll_area_map; + widget_class->unmap = foo_scroll_area_unmap; + + class->set_scroll_adjustments = foo_scroll_area_set_scroll_adjustments; + + parent_class = g_type_class_peek_parent (class); + + signals[VIEWPORT_CHANGED] = + g_signal_new ("viewport_changed", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (FooScrollAreaClass, + viewport_changed), + NULL, NULL, + foo_marshal_VOID__BOXED_BOXED, + G_TYPE_NONE, 2, + GDK_TYPE_RECTANGLE, + GDK_TYPE_RECTANGLE); + + signals[PAINT] = + g_signal_new ("paint", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (FooScrollAreaClass, + paint), + NULL, NULL, + foo_marshal_VOID__POINTER_BOXED_POINTER, + G_TYPE_NONE, 3, + G_TYPE_POINTER, + GDK_TYPE_RECTANGLE, + G_TYPE_POINTER); + + widget_class->set_scroll_adjustments_signal = + g_signal_new ("set_scroll_adjustments", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (FooScrollAreaClass, + set_scroll_adjustments), + NULL, NULL, + foo_marshal_VOID__OBJECT_OBJECT, + G_TYPE_NONE, 2, + GTK_TYPE_ADJUSTMENT, + GTK_TYPE_ADJUSTMENT); +} + +static GtkAdjustment * +new_adjustment (void) +{ + return GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0)); +} + +static void +foo_scroll_area_init (FooScrollArea *scroll_area) +{ + GtkWidget *widget; + + widget = GTK_WIDGET (scroll_area); + + gtk_widget_set_has_window (widget, FALSE); + gtk_widget_set_redraw_on_allocate (widget, FALSE); + + scroll_area->priv = g_new0 (FooScrollAreaPrivate, 1); + scroll_area->priv->width = 0; + scroll_area->priv->height = 0; + scroll_area->priv->hadj = g_object_ref_sink (new_adjustment()); + scroll_area->priv->vadj = g_object_ref_sink (new_adjustment()); + scroll_area->priv->x_offset = 0.0; + scroll_area->priv->y_offset = 0.0; + scroll_area->priv->min_width = -1; + scroll_area->priv->min_height = -1; + scroll_area->priv->auto_scroll_info = NULL; + scroll_area->priv->input_regions = g_ptr_array_new (); + scroll_area->priv->pixmap = NULL; + scroll_area->priv->update_region = gdk_region_new (); + + gtk_widget_set_double_buffered (widget, FALSE); +} + +static void +translate_cairo_device (cairo_t *cr, + int x_offset, + int y_offset) +{ + cairo_surface_t *surface = cairo_get_target (cr); + double dev_x; + double dev_y; + + cairo_surface_get_device_offset (surface, &dev_x, &dev_y); + dev_x += x_offset; + dev_y += y_offset; + cairo_surface_set_device_offset (surface, dev_x, dev_y); +} + +#if 0 +static void +print_region (const char *header, GdkRegion *region) +{ + GdkRectangle *rects; + int n_rects; + int i; + + g_print ("%s\n", header); + + gdk_region_get_rectangles (region, &rects, &n_rects); + for (i = 0; i < n_rects; ++i) + { + GdkRectangle *rect = &(rects[i]); + g_print (" %d %d %d %d\n", + rect->x, rect->y, rect->width, rect->height); + } +} +#endif + +typedef void (* PathForeachFunc) (double *x, + double *y, + gpointer data); + +static void +path_foreach_point (cairo_path_t *path, + PathForeachFunc func, + gpointer user_data) +{ + int i; + + for (i = 0; i < path->num_data; i += path->data[i].header.length) + { + cairo_path_data_t *data = &(path->data[i]); + + switch (data->header.type) + { + case CAIRO_PATH_MOVE_TO: + case CAIRO_PATH_LINE_TO: + func (&(data[1].point.x), &(data[1].point.y), user_data); + break; + + case CAIRO_PATH_CURVE_TO: + func (&(data[1].point.x), &(data[1].point.y), user_data); + func (&(data[2].point.x), &(data[2].point.y), user_data); + func (&(data[3].point.x), &(data[3].point.y), user_data); + break; + + case CAIRO_PATH_CLOSE_PATH: + break; + } + } +} + +typedef struct +{ + double x1, y1, x2, y2; +} Box; + +#if 0 +static void +update_box (double *x, double *y, gpointer data) +{ + Box *box = data; + + if (*x < box->x1) + box->x1 = *x; + + if (*y < box->y1) + box->y1 = *y; + + if (*y > box->y2) + box->y2 = *y; + + if (*x > box->x2) + box->x2 = *x; +} +#endif + +#if 0 +static void +path_compute_extents (cairo_path_t *path, + GdkRectangle *rect) +{ + if (rect) + { + Box box = { G_MAXDOUBLE, G_MAXDOUBLE, G_MINDOUBLE, G_MINDOUBLE }; + + path_foreach_point (path, update_box, &box); + + rect->x = box.x1; + rect->y = box.y1; + rect->width = box.x2 - box.x1; + rect->height = box.y2 - box.y1; + } +} +#endif + +static void +input_path_free_list (InputPath *paths) +{ + if (!paths) + return; + + input_path_free_list (paths->next); + cairo_path_destroy (paths->path); + g_free (paths); +} + +static void +input_region_free (InputRegion *region) +{ + input_path_free_list (region->paths); + gdk_region_destroy (region->region); + + g_free (region); +} + +static void +get_viewport (FooScrollArea *scroll_area, + GdkRectangle *viewport) +{ + GtkAllocation allocation; + GtkWidget *widget = GTK_WIDGET (scroll_area); + + gtk_widget_get_allocation (widget, &allocation); + + viewport->x = scroll_area->priv->x_offset; + viewport->y = scroll_area->priv->y_offset; + viewport->width = allocation.width; + viewport->height = allocation.height; +} + +static void +allocation_to_canvas (FooScrollArea *area, + int *x, + int *y) +{ + *x += area->priv->x_offset; + *y += area->priv->y_offset; +} + +static void +clear_exposed_input_region (FooScrollArea *area, + GdkRegion *exposed) /* in canvas coordinates */ +{ + int i; + GdkRegion *viewport; + GdkRectangle allocation; + + gtk_widget_get_allocation (GTK_WIDGET (area), &allocation); + allocation.x = 0; + allocation.y = 0; + allocation_to_canvas (area, &allocation.x, &allocation.y); + viewport = gdk_region_rectangle (&allocation); + gdk_region_subtract (viewport, exposed); + + for (i = 0; i < area->priv->input_regions->len; ++i) + { + InputRegion *region = area->priv->input_regions->pdata[i]; + + gdk_region_intersect (region->region, viewport); + + if (gdk_region_empty (region->region)) + { + input_region_free (region); + g_ptr_array_remove_index_fast (area->priv->input_regions, i--); + } + } + + gdk_region_destroy (viewport); + +#if 0 + path = region->paths; + while (path != NULL) + { + GdkRectangle rect; + + path_compute_extents (path->path, &rect); + + if (gdk_region_rect_in (area->priv->expose_region, &rect) == GDK_OVERLAP_RECTANGLE_IN) + g_print ("we would have deleted it\n"); +#if 0 + else + g_print ("nope (%d %d %d %d)\n", ); +#endif + + path = path->next; + } + + /* FIXME: we should also delete paths (and path segments) + * completely contained in the expose_region + */ + } +#endif +} + +static void +setup_background_cr (GdkWindow *window, + cairo_t *cr, + int x_offset, + int y_offset) +{ + GdkWindowObject *private = (GdkWindowObject *)window; + + if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG && private->parent) + { + x_offset += private->x; + y_offset += private->y; + + setup_background_cr (GDK_WINDOW (private->parent), cr, x_offset, y_offset); + } + else if (private->bg_pixmap && + private->bg_pixmap != GDK_PARENT_RELATIVE_BG && + private->bg_pixmap != GDK_NO_BG) + { + gdk_cairo_set_source_pixmap (cr, private->bg_pixmap, -x_offset, -y_offset); + } + else + { + gdk_cairo_set_source_color (cr, &private->bg_color); + } +} + +static void +initialize_background (GtkWidget *widget, + cairo_t *cr) +{ + setup_background_cr (gtk_widget_get_window (widget), cr, 0, 0); + + cairo_paint (cr); +} + +static void +clip_to_region (cairo_t *cr, GdkRegion *region) +{ + int n_rects; + GdkRectangle *rects; + + gdk_region_get_rectangles (region, &rects, &n_rects); + + cairo_new_path (cr); + while (n_rects--) + { + GdkRectangle *rect = &(rects[n_rects]); + + cairo_rectangle (cr, rect->x, rect->y, rect->width, rect->height); + } + cairo_clip (cr); + + g_free (rects); +} + +static void +simple_draw_drawable (GdkDrawable *dst, + GdkDrawable *src, + int src_x, + int src_y, + int dst_x, + int dst_y, + int width, + int height) +{ + GdkGC *gc = gdk_gc_new (dst); + + gdk_draw_drawable (dst, gc, src, src_x, src_y, dst_x, dst_y, width, height); + + g_object_unref (gc); +} + +static gboolean +foo_scroll_area_expose (GtkWidget *widget, + GdkEventExpose *expose) +{ + FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget); + cairo_t *cr; + GdkRectangle extents; + GdkRegion *region; + int x_offset, y_offset; + GdkGC *gc; + GtkAllocation widget_allocation; + GdkWindow *window = gtk_widget_get_window (widget); + + /* I don't think expose can ever recurse for the same area */ + g_assert (!scroll_area->priv->expose_region); + + /* Note that this function can be called at a time + * where the adj->value is different from x_offset. + * Ie., the GtkScrolledWindow changed the adj->value + * without emitting the value_changed signal. + * + * Hence we must always use the value we got + * the last time the signal was emitted, ie., + * priv->{x,y}_offset. + */ + + x_offset = scroll_area->priv->x_offset; + y_offset = scroll_area->priv->y_offset; + + scroll_area->priv->expose_region = expose->region; + + /* Setup input areas */ + clear_exposed_input_region (scroll_area, scroll_area->priv->update_region); + + scroll_area->priv->current_input = g_new0 (InputRegion, 1); + scroll_area->priv->current_input->region = gdk_region_copy (scroll_area->priv->update_region); + scroll_area->priv->current_input->paths = NULL; + g_ptr_array_add (scroll_area->priv->input_regions, + scroll_area->priv->current_input); + + region = scroll_area->priv->update_region; + scroll_area->priv->update_region = gdk_region_new (); + + /* Create cairo context */ + cr = gdk_cairo_create (scroll_area->priv->pixmap); + translate_cairo_device (cr, -x_offset, -y_offset); + clip_to_region (cr, region); + initialize_background (widget, cr); + + /* Create regions */ + gdk_region_get_clipbox (region, &extents); + + g_signal_emit (widget, signals[PAINT], 0, cr, &extents, region); + + /* Destroy stuff */ + cairo_destroy (cr); + + scroll_area->priv->expose_region = NULL; + scroll_area->priv->current_input = NULL; + + /* Finally draw the backing pixmap */ + gc = gdk_gc_new (window); + + gdk_gc_set_clip_region (gc, expose->region); + + gtk_widget_get_allocation (widget, &widget_allocation); + gdk_draw_drawable (window, gc, scroll_area->priv->pixmap, + 0, 0, widget_allocation.x, widget_allocation.y, + widget_allocation.width, widget_allocation.height); + + g_object_unref (gc); + gdk_region_destroy (region); + + return TRUE; +} + +void +foo_scroll_area_get_viewport (FooScrollArea *scroll_area, + GdkRectangle *viewport) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + + if (!viewport) + return; + + get_viewport (scroll_area, viewport); +} + +static void +process_event (FooScrollArea *scroll_area, + FooScrollAreaEventType input_type, + int x, + int y); + +static void +emit_viewport_changed (FooScrollArea *scroll_area, + GdkRectangle *new_viewport, + GdkRectangle *old_viewport) +{ + int px, py; + g_signal_emit (scroll_area, signals[VIEWPORT_CHANGED], 0, + new_viewport, old_viewport); + + gdk_window_get_pointer (scroll_area->priv->input_window, &px, &py, NULL); + +#if 0 + g_print ("procc\n"); +#endif + + process_event (scroll_area, FOO_MOTION, px, py); +} + +static void +clamp_adjustment (GtkAdjustment *adj) +{ + if (gtk_adjustment_get_upper (adj) >= gtk_adjustment_get_page_size (adj)) + gtk_adjustment_set_value (adj, CLAMP (gtk_adjustment_get_value (adj), 0.0, + gtk_adjustment_get_upper (adj) + - gtk_adjustment_get_page_size (adj))); + else + gtk_adjustment_set_value (adj, 0.0); + + gtk_adjustment_changed (adj); +} + +static gboolean +set_adjustment_values (FooScrollArea *scroll_area) +{ + GtkAllocation allocation; + + GtkAdjustment *hadj = scroll_area->priv->hadj; + GtkAdjustment *vadj = scroll_area->priv->vadj; + + /* Horizontal */ + gtk_widget_get_allocation (GTK_WIDGET (scroll_area), &allocation); + g_object_freeze_notify (G_OBJECT (hadj)); + gtk_adjustment_set_page_size (hadj, allocation.width); + gtk_adjustment_set_step_increment (hadj, 0.1 * allocation.width); + gtk_adjustment_set_page_increment (hadj, 0.9 * allocation.width); + gtk_adjustment_set_lower (hadj, 0.0); + gtk_adjustment_set_upper (hadj, scroll_area->priv->width); + g_object_thaw_notify (G_OBJECT (hadj)); + + /* Vertical */ + g_object_freeze_notify (G_OBJECT (vadj)); + gtk_adjustment_set_page_size (vadj, allocation.height); + gtk_adjustment_set_step_increment (vadj, 0.1 * allocation.height); + gtk_adjustment_set_page_increment (vadj, 0.9 * allocation.height); + gtk_adjustment_set_lower (vadj, 0.0); + gtk_adjustment_set_upper (vadj, scroll_area->priv->height); + g_object_thaw_notify (G_OBJECT (vadj)); + + clamp_adjustment (hadj); + clamp_adjustment (vadj); + + return TRUE; +} + +static void +foo_scroll_area_realize (GtkWidget *widget) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + GdkWindowAttr attributes; + GtkAllocation widget_allocation; + GdkWindow *window; + gint attributes_mask; + + gtk_widget_get_allocation (widget, &widget_allocation); + gtk_widget_set_realized (widget, TRUE); + + attributes.window_type = GDK_WINDOW_CHILD; + attributes.x = widget_allocation.x; + attributes.y = widget_allocation.y; + attributes.width = widget_allocation.width; + attributes.height = widget_allocation.height; + attributes.wclass = GDK_INPUT_ONLY; + attributes.event_mask = gtk_widget_get_events (widget); + attributes.event_mask |= (GDK_BUTTON_PRESS_MASK | + GDK_BUTTON_RELEASE_MASK | + GDK_BUTTON1_MOTION_MASK | + GDK_BUTTON2_MOTION_MASK | + GDK_BUTTON3_MOTION_MASK | + GDK_POINTER_MOTION_MASK | + GDK_ENTER_NOTIFY_MASK | + GDK_LEAVE_NOTIFY_MASK); + + attributes_mask = GDK_WA_X | GDK_WA_Y; + + window = gtk_widget_get_parent_window (widget); + gtk_widget_set_window (widget, window); + g_object_ref (window); + + area->priv->input_window = gdk_window_new (window, + &attributes, attributes_mask); + area->priv->pixmap = gdk_pixmap_new (window, + widget_allocation.width, + widget_allocation.height, + -1); + gdk_window_set_user_data (area->priv->input_window, area); + + gtk_widget_style_attach (widget); +} + +static void +foo_scroll_area_unrealize (GtkWidget *widget) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + if (area->priv->input_window) + { + gdk_window_set_user_data (area->priv->input_window, NULL); + gdk_window_destroy (area->priv->input_window); + area->priv->input_window = NULL; + } + + GTK_WIDGET_CLASS (parent_class)->unrealize (widget); +} + +static GdkPixmap * +create_new_pixmap (GtkWidget *widget, + GdkPixmap *old) +{ + GtkAllocation widget_allocation; + GdkPixmap *new; + + gtk_widget_get_allocation (widget, &widget_allocation); + new = gdk_pixmap_new (gtk_widget_get_window (widget), + widget_allocation.width, + widget_allocation.height, + -1); + + /* Unfortunately we don't know in which direction we were resized, + * so we just assume we were dragged from the south-east corner. + * + * Although, maybe we could get the root coordinates of the input-window? + * That might just work, actually. We need to make sure marco uses + * static gravity for the window before this will be useful. + */ + simple_draw_drawable (new, old, 0, 0, 0, 0, -1, -1); + + return new; +} + +static void +allocation_to_canvas_region (FooScrollArea *area, + GdkRegion *region) +{ + gdk_region_offset (region, area->priv->x_offset, area->priv->y_offset); +} + + +static void +foo_scroll_area_size_allocate (GtkWidget *widget, + GtkAllocation *allocation) +{ + FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget); + GdkRectangle new_viewport; + GdkRectangle old_viewport; + GdkRegion *old_allocation; + GdkRegion *invalid; + GtkAllocation widget_allocation; + + get_viewport (scroll_area, &old_viewport); + + gtk_widget_get_allocation (widget, &widget_allocation); + old_allocation = gdk_region_rectangle (&widget_allocation); + gdk_region_offset (old_allocation, + -widget_allocation.x, -widget_allocation.y); + invalid = gdk_region_rectangle (allocation); + gdk_region_offset (invalid, -allocation->x, -allocation->y); + gdk_region_xor (invalid, old_allocation); + allocation_to_canvas_region (scroll_area, invalid); + foo_scroll_area_invalidate_region (scroll_area, invalid); + gdk_region_destroy (old_allocation); + gdk_region_destroy (invalid); + + gtk_widget_set_allocation (widget, allocation); + + if (scroll_area->priv->input_window) + { + GdkPixmap *new_pixmap; + + gdk_window_move_resize (scroll_area->priv->input_window, + allocation->x, allocation->y, + allocation->width, allocation->height); + + new_pixmap = create_new_pixmap (widget, scroll_area->priv->pixmap); + + g_object_unref (scroll_area->priv->pixmap); + + scroll_area->priv->pixmap = new_pixmap; + } + + get_viewport (scroll_area, &new_viewport); + + emit_viewport_changed (scroll_area, &new_viewport, &old_viewport); +} + +static void +emit_input (FooScrollArea *scroll_area, + FooScrollAreaEventType type, + int x, + int y, + FooScrollAreaEventFunc func, + gpointer data) +{ + FooScrollAreaEvent event; + + if (!func) + return; + + if (type != FOO_MOTION) + emit_input (scroll_area, FOO_MOTION, x, y, func, data); + +#if 0 + x += scroll_area->priv->x_offset; + y += scroll_area->priv->y_offset; +#endif + + event.type = type; + event.x = x; + event.y = y; + + func (scroll_area, &event, data); +} + +#if 0 +static void +print_path (const char *header, + cairo_path_t *path) +{ + int i; + + g_print ("%s\n", header); + + for (i=0; i < path->num_data; i += path->data[i].header.length) + { + cairo_path_data_t *data = &(path->data[i]); + + switch (data->header.type) + { + case CAIRO_PATH_MOVE_TO: + g_print ("move to: %f, %f\n", data[1].point.x, data[1].point.y); + break; + + case CAIRO_PATH_LINE_TO: + g_print ("line to: %f, %f\n", data[1].point.x, data[1].point.y); + break; + + case CAIRO_PATH_CURVE_TO: + g_print ("curve to: %f, %f\n", data[1].point.x, data[1].point.y); + g_print (" %f, %f\n", data[1].point.x, data[1].point.y); + g_print (" %f, %f\n", data[1].point.x, data[1].point.y); + break; + + case CAIRO_PATH_CLOSE_PATH: + break; + } + } +} +#endif + +static void +process_event (FooScrollArea *scroll_area, + FooScrollAreaEventType input_type, + int x, + int y) +{ + GtkWidget *widget = GTK_WIDGET (scroll_area); + int i; + + allocation_to_canvas (scroll_area, &x, &y); + + if (scroll_area->priv->grabbed) + { + emit_input (scroll_area, input_type, x, y, + scroll_area->priv->grab_func, + scroll_area->priv->grab_data); + return; + } + + +#if 0 + x += widget->allocation.x; + y += widget->allocation.y; +#endif + +#if 0 + g_print ("number of input regions: %d\n", scroll_area->priv->input_regions->len); +#endif + + for (i = 0; i < scroll_area->priv->input_regions->len; ++i) + { + InputRegion *region = scroll_area->priv->input_regions->pdata[i]; + +#if 0 + g_print ("%d ", i); + print_region ("region:", region->region); +#endif + + if (gdk_region_point_in (region->region, x, y)) + { + InputPath *path; + + path = region->paths; + while (path) + { + cairo_t *cr; + gboolean inside; + + cr = gdk_cairo_create (gtk_widget_get_window (widget)); + cairo_set_fill_rule (cr, path->fill_rule); + cairo_set_line_width (cr, path->line_width); + cairo_append_path (cr, path->path); + + if (path->is_stroke) + inside = cairo_in_stroke (cr, x, y); + else + inside = cairo_in_fill (cr, x, y); + + cairo_destroy (cr); + + if (inside) + { + emit_input (scroll_area, input_type, + x, y, + path->func, + path->data); + return; + } + + path = path->next; + } + + /* Since the regions are all disjoint, no other region + * can match. Of course we could be clever and try and + * sort the regions, but so far I have been unable to + * make this loop show up on a profile. + */ + return; + } + } +} + +static void +process_gdk_event (FooScrollArea *scroll_area, + int x, + int y, + GdkEvent *event) +{ + FooScrollAreaEventType input_type; + + if (event->type == GDK_BUTTON_PRESS) + input_type = FOO_BUTTON_PRESS; + else if (event->type == GDK_BUTTON_RELEASE) + input_type = FOO_BUTTON_RELEASE; + else if (event->type == GDK_MOTION_NOTIFY) + input_type = FOO_MOTION; + else + return; + + process_event (scroll_area, input_type, x, y); +} + +static gboolean +foo_scroll_area_button_press (GtkWidget *widget, + GdkEventButton *event) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + process_gdk_event (area, event->x, event->y, (GdkEvent *)event); + + return TRUE; +} + +static gboolean +foo_scroll_area_button_release (GtkWidget *widget, + GdkEventButton *event) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + process_gdk_event (area, event->x, event->y, (GdkEvent *)event); + + return FALSE; +} + +static gboolean +foo_scroll_area_motion (GtkWidget *widget, + GdkEventMotion *event) +{ + FooScrollArea *area = FOO_SCROLL_AREA (widget); + + process_gdk_event (area, event->x, event->y, (GdkEvent *)event); + return TRUE; +} + +void +foo_scroll_area_set_size_fixed_y (FooScrollArea *scroll_area, + int width, + int height, + int old_y, + int new_y) +{ + scroll_area->priv->width = width; + scroll_area->priv->height = height; + +#if 0 + g_print ("diff: %d\n", new_y - old_y); +#endif + g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj)); + gtk_adjustment_set_value (scroll_area->priv->vadj, new_y); + + set_adjustment_values (scroll_area); + g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj)); +} + +void +foo_scroll_area_set_size (FooScrollArea *scroll_area, + int width, + int height) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + + /* FIXME: Default scroll algorithm should probably be to + * keep the same *area* outside the screen as before. + * + * For wrapper widgets that will do something roughly + * right. For widgets that don't change size, it + * will do the right thing. Except for idle-layouting + * widgets. + * + * Maybe there should be some generic support for those + * widgets. Can that even be done? + * + * Should we have a version of this function using + * fixed points? + */ + + scroll_area->priv->width = width; + scroll_area->priv->height = height; + + set_adjustment_values (scroll_area); +} + +static void +foo_scroll_area_size_request (GtkWidget *widget, + GtkRequisition *requisition) +{ + FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget); + + requisition->width = scroll_area->priv->min_width; + requisition->height = scroll_area->priv->min_height; + +#if 0 + g_print ("request %d %d\n", requisition->width, requisition->height); +#endif +} + +#if 0 +static void +translate_point (double *x, double *y, gpointer data) +{ + int *translation = data; + + *x += translation[0]; + *y += translation[1]; +} +#endif + +#if 0 +static void +path_translate (cairo_path_t *path, + int dx, + int dy) +{ + int translation[2] = {dx, dy}; + + path_foreach_point (path, translate_point, translation); +} +#endif + +static void +translate_input_regions (FooScrollArea *scroll_area, + int dx, + int dy) +{ +#if 0 + int i; + + for (i = 0; i < scroll_area->priv->input_regions->len; ++i) + { + InputRegion *region = scroll_area->priv->input_regions->pdata[i]; + InputPath *path; + + gdk_region_offset (region->region, dx, dy); + + path = region->paths; + while (path != NULL) + { + path_translate (path->path, dx, dy); + path = path->next; + } + } +#endif +} + +#if 0 +static void +paint_region (FooScrollArea *area, GdkRegion *region) +{ + int n_rects; + GdkRectangle *rects; + region = gdk_region_copy (region); + + gdk_region_get_rectangles (region, &rects, &n_rects); + + gdk_region_offset (region, + GTK_WIDGET (area)->allocation.x, + GTK_WIDGET (area)->allocation.y); + + GdkGC *gc = gdk_gc_new (GTK_WIDGET (area)->window); + gdk_gc_set_clip_region (gc, region); + gdk_draw_rectangle (GTK_WIDGET (area)->window, gc, TRUE, 0, 0, -1, -1); + g_object_unref (gc); + g_free (rects); +} +#endif + +static void +foo_scroll_area_scroll (FooScrollArea *area, + gint dx, + gint dy) +{ + GdkRectangle allocation; + GdkRectangle src_area; + GdkRectangle move_area; + GdkRegion *invalid_region; + + gtk_widget_get_allocation (GTK_WIDGET (area), &allocation); + allocation.x = 0; + allocation.y = 0; + + src_area = allocation; + src_area.x -= dx; + src_area.y -= dy; + + invalid_region = gdk_region_rectangle (&allocation); + + if (gdk_rectangle_intersect (&allocation, &src_area, &move_area)) + { + GdkRegion *move_region; + +#if 0 + g_print ("scrolling %d %d %d %d (%d %d)\n", + move_area.x, move_area.y, + move_area.width, move_area.height, + dx, dy); +#endif + + simple_draw_drawable (area->priv->pixmap, area->priv->pixmap, + move_area.x, move_area.y, + move_area.x + dx, move_area.y + dy, + move_area.width, move_area.height); + gtk_widget_queue_draw (GTK_WIDGET (area)); + + move_region = gdk_region_rectangle (&move_area); + gdk_region_offset (move_region, dx, dy); + gdk_region_subtract (invalid_region, move_region); + gdk_region_destroy (move_region); + } + +#if 0 + paint_region (area, invalid_region); +#endif + + allocation_to_canvas_region (area, invalid_region); + + foo_scroll_area_invalidate_region (area, invalid_region); + + gdk_region_destroy (invalid_region); +} + +static void +foo_scrollbar_adjustment_changed (GtkAdjustment *adj, + FooScrollArea *scroll_area) +{ + GtkWidget *widget = GTK_WIDGET (scroll_area); + gint dx = 0; + gint dy = 0; + GdkRectangle old_viewport, new_viewport; + + get_viewport (scroll_area, &old_viewport); + + if (adj == scroll_area->priv->hadj) + { + /* FIXME: do we treat the offset as int or double, and, + * if int, how do we round? + */ + dx = (int)gtk_adjustment_get_value (adj) - scroll_area->priv->x_offset; + scroll_area->priv->x_offset = gtk_adjustment_get_value (adj); + } + else if (adj == scroll_area->priv->vadj) + { + dy = (int)gtk_adjustment_get_value (adj) - scroll_area->priv->y_offset; + scroll_area->priv->y_offset = gtk_adjustment_get_value (adj); + } + else + { + g_assert_not_reached (); + } + + if (gtk_widget_get_realized (widget)) + { + foo_scroll_area_scroll (scroll_area, -dx, -dy); + +#if 0 + window_scroll_area (widget->window, &widget->allocation, -dx, -dy); +#endif + translate_input_regions (scroll_area, -dx, -dy); + +#if 0 + gdk_window_process_updates (widget->window, TRUE); +#endif + } + + get_viewport (scroll_area, &new_viewport); + + emit_viewport_changed (scroll_area, &new_viewport, &old_viewport); +} + +static void +set_one_adjustment (FooScrollArea *scroll_area, + GtkAdjustment *adjustment, + GtkAdjustment **location) +{ + g_return_if_fail (location != NULL); + + if (adjustment == *location) + return; + + if (!adjustment) + adjustment = new_adjustment (); + + g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); + + if (*location) + { + g_signal_handlers_disconnect_by_func ( + *location, foo_scrollbar_adjustment_changed, scroll_area); + + g_object_unref (*location); + } + + *location = adjustment; + + g_object_ref_sink (*location); + + g_signal_connect (*location, "value_changed", + G_CALLBACK (foo_scrollbar_adjustment_changed), + scroll_area); +} + +static void +foo_scroll_area_set_scroll_adjustments (FooScrollArea *scroll_area, + GtkAdjustment *hadjustment, + GtkAdjustment *vadjustment) +{ + set_one_adjustment (scroll_area, hadjustment, &scroll_area->priv->hadj); + set_one_adjustment (scroll_area, vadjustment, &scroll_area->priv->vadj); + + set_adjustment_values (scroll_area); +} + +FooScrollArea * +foo_scroll_area_new (void) +{ + return g_object_new (FOO_TYPE_SCROLL_AREA, NULL); +} + +void +foo_scroll_area_set_min_size (FooScrollArea *scroll_area, + int min_width, + int min_height) +{ + scroll_area->priv->min_width = min_width; + scroll_area->priv->min_height = min_height; + + /* FIXME: think through invalidation. + * + * Goals: - no repainting everything on size_allocate(), + * - make sure input boxes are invalidated when + * needed + */ + gtk_widget_queue_resize (GTK_WIDGET (scroll_area)); +} + +#if 0 +static void +warn_about_adding_input_outside_expose (const char *func) +{ + static gboolean warned = FALSE; + + if (!warned) + { + g_warning ("%s() can only be called " + "from the paint handler for the FooScrollArea\n", func); + + warned = TRUE; + } +} +#endif + +static void +user_to_device (double *x, double *y, + gpointer data) +{ + cairo_t *cr = data; + + cairo_user_to_device (cr, x, y); +} + +static InputPath * +make_path (FooScrollArea *area, + cairo_t *cr, + gboolean is_stroke, + FooScrollAreaEventFunc func, + gpointer data) +{ + InputPath *path = g_new0 (InputPath, 1); + + path->is_stroke = is_stroke; + path->fill_rule = cairo_get_fill_rule (cr); + path->line_width = cairo_get_line_width (cr); + path->path = cairo_copy_path (cr); + path_foreach_point (path->path, user_to_device, cr); + path->func = func; + path->data = data; + path->next = area->priv->current_input->paths; + area->priv->current_input->paths = path; + return path; +} + +/* FIXME: we probably really want a + * + * foo_scroll_area_add_input_from_fill (area, cr, ...); + * and + * foo_scroll_area_add_input_from_stroke (area, cr, ...); + * as well. + */ +void +foo_scroll_area_add_input_from_fill (FooScrollArea *scroll_area, + cairo_t *cr, + FooScrollAreaEventFunc func, + gpointer data) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + g_return_if_fail (cr != NULL); + g_return_if_fail (scroll_area->priv->current_input); + + make_path (scroll_area, cr, FALSE, func, data); +} + +void +foo_scroll_area_add_input_from_stroke (FooScrollArea *scroll_area, + cairo_t *cr, + FooScrollAreaEventFunc func, + gpointer data) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + g_return_if_fail (cr != NULL); + g_return_if_fail (scroll_area->priv->current_input); + + make_path (scroll_area, cr, TRUE, func, data); +} + +void +foo_scroll_area_invalidate (FooScrollArea *scroll_area) +{ + GtkAllocation allocation; + GtkWidget *widget = GTK_WIDGET (scroll_area); + + gtk_widget_get_allocation (widget, &allocation); + foo_scroll_area_invalidate_rect (scroll_area, + scroll_area->priv->x_offset, scroll_area->priv->y_offset, + allocation.width, + allocation.height); +} + +static void +canvas_to_window (FooScrollArea *area, + GdkRegion *region) +{ + GtkAllocation allocation; + GtkWidget *widget = GTK_WIDGET (area); + + gtk_widget_get_allocation (widget, &allocation); + gdk_region_offset (region, + -area->priv->x_offset + allocation.x, + -area->priv->y_offset + allocation.y); +} + +static void +window_to_canvas (FooScrollArea *area, + GdkRegion *region) +{ + GtkAllocation allocation; + GtkWidget *widget = GTK_WIDGET (area); + + gtk_widget_get_allocation (widget, &allocation); + gdk_region_offset (region, + area->priv->x_offset - allocation.x, + area->priv->y_offset - allocation.y); +} + +void +foo_scroll_area_invalidate_region (FooScrollArea *area, + GdkRegion *region) +{ + GtkWidget *widget; + + g_return_if_fail (FOO_IS_SCROLL_AREA (area)); + + widget = GTK_WIDGET (area); + + gdk_region_union (area->priv->update_region, region); + + if (gtk_widget_get_realized (widget)) + { + canvas_to_window (area, region); + + gdk_window_invalidate_region (gtk_widget_get_window (widget), + region, TRUE); + + window_to_canvas (area, region); + } +} + +void +foo_scroll_area_invalidate_rect (FooScrollArea *scroll_area, + int x, + int y, + int width, + int height) +{ + GdkRectangle rect = { x, y, width, height }; + GdkRegion *region; + + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + + region = gdk_region_rectangle (&rect); + + foo_scroll_area_invalidate_region (scroll_area, region); + + gdk_region_destroy (region); +} + +void +foo_scroll_area_begin_grab (FooScrollArea *scroll_area, + FooScrollAreaEventFunc func, + gpointer input_data) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + g_return_if_fail (!scroll_area->priv->grabbed); + + scroll_area->priv->grabbed = TRUE; + scroll_area->priv->grab_func = func; + scroll_area->priv->grab_data = input_data; + + /* FIXME: we should probably take a server grab */ + /* Also, maybe there should be support for setting the grab cursor */ +} + +void +foo_scroll_area_end_grab (FooScrollArea *scroll_area) +{ + g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area)); + + scroll_area->priv->grabbed = FALSE; + scroll_area->priv->grab_func = NULL; + scroll_area->priv->grab_data = NULL; +} + +gboolean +foo_scroll_area_is_grabbed (FooScrollArea *scroll_area) +{ + return scroll_area->priv->grabbed; +} + +void +foo_scroll_area_set_viewport_pos (FooScrollArea *scroll_area, + int x, + int y) +{ + g_object_freeze_notify (G_OBJECT (scroll_area->priv->hadj)); + g_object_freeze_notify (G_OBJECT (scroll_area->priv->vadj)); + gtk_adjustment_set_value (scroll_area->priv->hadj, x); + gtk_adjustment_set_value (scroll_area->priv->vadj, y); + + set_adjustment_values (scroll_area); + g_object_thaw_notify (G_OBJECT (scroll_area->priv->hadj)); + g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj)); +} + +static gboolean +rect_contains (const GdkRectangle *rect, int x, int y) +{ + return (x >= rect->x && + y >= rect->y && + x < rect->x + rect->width && + y < rect->y + rect->height); +} + +static void +stop_scrolling (FooScrollArea *area) +{ +#if 0 + g_print ("stop scrolling\n"); +#endif + if (area->priv->auto_scroll_info) + { + g_source_remove (area->priv->auto_scroll_info->timeout_id); + g_timer_destroy (area->priv->auto_scroll_info->timer); + g_free (area->priv->auto_scroll_info); + + area->priv->auto_scroll_info = NULL; + } +} + +static gboolean +scroll_idle (gpointer data) +{ + GdkRectangle viewport, new_viewport; + FooScrollArea *area = data; + AutoScrollInfo *info = area->priv->auto_scroll_info; +#if 0 + int dx, dy; +#endif + int new_x, new_y; + double elapsed; + + get_viewport (area, &viewport); + +#if 0 + g_print ("old info: %d %d\n", info->dx, info->dy); + + g_print ("timeout (%d %d)\n", dx, dy); +#endif + +#if 0 + viewport.x += info->dx; + viewport.y += info->dy; +#endif + +#if 0 + g_print ("new info %d %d\n", info->dx, info->dy); +#endif + + elapsed = g_timer_elapsed (info->timer, NULL); + + info->res_x = elapsed * info->dx / 0.2; + info->res_y = elapsed * info->dy / 0.2; + +#if 0 + g_print ("%f %f\n", info->res_x, info->res_y); +#endif + + new_x = viewport.x + info->res_x; + new_y = viewport.y + info->res_y; + +#if 0 + g_print ("%f\n", elapsed * (info->dx / 0.2)); +#endif + +#if 0 + g_print ("new_x, new_y\n: %d %d\n", new_x, new_y); +#endif + + foo_scroll_area_set_viewport_pos (area, new_x, new_y); +#if 0 + viewport.x + info->dx, + viewport.y + info->dy); +#endif + + get_viewport (area, &new_viewport); + + if (viewport.x == new_viewport.x && + viewport.y == new_viewport.y && + (info->res_x > 1.0 || + info->res_y > 1.0 || + info->res_x < -1.0 || + info->res_y < -1.0)) + { + stop_scrolling (area); + + /* stop scrolling if it didn't have an effect */ + return FALSE; + } + + return TRUE; +} + +static void +ensure_scrolling (FooScrollArea *area, + int dx, + int dy) +{ + if (!area->priv->auto_scroll_info) + { +#if 0 + g_print ("start scrolling\n"); +#endif + area->priv->auto_scroll_info = g_new0 (AutoScrollInfo, 1); + area->priv->auto_scroll_info->timeout_id = + g_idle_add (scroll_idle, area); + area->priv->auto_scroll_info->timer = g_timer_new (); + } + +#if 0 + g_print ("setting scrolling to %d %d\n", dx, dy); +#endif + +#if 0 + g_print ("dx, dy: %d %d\n", dx, dy); +#endif + + area->priv->auto_scroll_info->dx = dx; + area->priv->auto_scroll_info->dy = dy; +} + +void +foo_scroll_area_auto_scroll (FooScrollArea *scroll_area, + FooScrollAreaEvent *event) +{ + GdkRectangle viewport; + + get_viewport (scroll_area, &viewport); + + if (rect_contains (&viewport, event->x, event->y)) + { + stop_scrolling (scroll_area); + } + else + { + int dx, dy; + + dx = dy = 0; + + if (event->y < viewport.y) + { + dy = event->y - viewport.y; + dy = MIN (dy + 2, 0); + } + else if (event->y >= viewport.y + viewport.height) + { + dy = event->y - (viewport.y + viewport.height - 1); + dy = MAX (dy - 2, 0); + } + + if (event->x < viewport.x) + { + dx = event->x - viewport.x; + dx = MIN (dx + 2, 0); + } + else if (event->x >= viewport.x + viewport.width) + { + dx = event->x - (viewport.x + viewport.width - 1); + dx = MAX (dx - 2, 0); + } + +#if 0 + g_print ("dx, dy: %d %d\n", dx, dy); +#endif + + ensure_scrolling (scroll_area, dx, dy); + } +} + +void +foo_scroll_area_begin_auto_scroll (FooScrollArea *scroll_area) +{ + /* noop for now */ +} + +void +foo_scroll_area_end_auto_scroll (FooScrollArea *scroll_area) +{ + stop_scrolling (scroll_area); +} + + + +#if 0 +/* + * Backing Store + */ +struct BackingStore +{ + GdkPixmap *pixmap; + GdkRegion *update_region; + int width; + int height; +}; + +static BackingStore * +backing_store_new (GdkWindow *window, + int width, int height) +{ + BackingStore *store = g_new0 (BackingStore, 1); + GdkRectangle rect = { 0, 0, width, height }; + + store->pixmap = gdk_pixmap_new (window, width, height, -1); + store->update_region = gdk_region_rectangle (&rect); + store->width = width; + store->height = height; + + return store; +} + +static void +backing_store_free (BackingStore *store) +{ + g_object_unref (store->pixmap); + gdk_region_destroy (store->update_region); + g_free (store); +} + +static void +backing_store_draw (BackingStore *store, + GdkDrawable *dest, + GdkRegion *clip, + int x, + int y) +{ + GdkGC *gc = gdk_gc_new (dest); + + gdk_gc_set_clip_region (gc, clip); + + gdk_draw_drawable (dest, gc, store->pixmap, + 0, 0, x, y, store->width, store->height); + + g_object_unref (gc); +} + +static void +backing_store_scroll (BackingStore *store, + int dx, + int dy) +{ + GdkGC *gc = gdk_gc_new (store->pixmap); + GdkRectangle rect; + + gdk_draw_drawable (store->pixmap, gc, store->pixmap, + 0, 0, dx, dy, + store->width, store->height); + + /* Invalidate vertically */ + rect.x = 0; + rect.width = store->width; + + if (dy > 0) + { + rect.y = 0; + rect.height = dy; + } + else + { + rect.y = store->height + dy; + rect.y = -dy; + } + + gdk_region_union_with_rect (store->update_region, &rect); + + /* Invalidate horizontally */ + rect.y = 0; + rect.height = store->height; + + if (dx > 0) + { + rect.x = 0; + rect.width = dx; + } + else + { + rect.x = store->width + dx; + rect.width = -dx; + } + + gdk_region_union_with_rect (store->update_region, &rect); +} + +static void +backing_store_invalidate_rect (BackingStore *store, + GdkRectangle *rect) +{ + gdk_region_union_with_rect (store->update_region, rect); +} + +static void +backing_store_invalidate_region (BackingStore *store, + GdkRegion *region) +{ + gdk_region_union (store->update_region, region); +} + +static void +backing_store_invalidate_all (BackingStore *store) +{ + GdkRectangle rect = { 0, 0, store->width, store->height }; + gdk_region_destroy (store->update_region); + store->update_region = gdk_region_rectangle (&rect); +} + +static void +backing_store_resize (BackingStore *store, + int width, + int height) +{ + GdkPixmap *pixmap = gdk_pixmap_new (store->pixmap, width, height, -1); + + /* Unfortunately we don't know in which direction we were resized, + * so we just assume we were dragged from the south-east corner. + * + * Although, maybe we could get the root coordinates of the input-window? + * That might just work, actually. We need to make sure marco uses + * static gravity for the window before this will be useful. + */ + simple_draw_drawable (pixmap, store->pixmap, 0, 0, 0, 0, -1, -1); + + g_object_unref (store->pixmap); + + store->pixmap = pixmap; + + /* FIXME: invalidate uncovered strip only */ + + backing_store_invalidate_all (store); +} + +static void +cclip_to_region (cairo_t *cr, GdkRegion *region) +{ + int n_rects; + GdkRectangle *rects; + + gdk_region_get_rectangles (region, &rects, &n_rects); + + cairo_new_path (cr); + while (n_rects--) + { + GdkRectangle *rect = &(rects[n_rects]); + + cairo_rectangle (cr, rect->x, rect->y, rect->width, rect->height); + } + cairo_clip (cr); + + g_free (rects); +} + +static void +backing_store_process_updates (BackingStore *store, + ExposeFunc func, + gpointer data) +{ + cairo_t *cr = gdk_cairo_create (store->pixmap); + GdkRegion *region = store->update_region; + store->update_region = gdk_region_new (); + + cclip_to_region (cr, store->update_region); + + func (cr, store->update_region, data); + + gdk_region_destroy (region); + cairo_destroy (cr); +} + +#endif |