[sysprof/wip/visualizers] line-visualizer: plumb off-screen rendering mechanics
- From: Christian Hergert <chergert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [sysprof/wip/visualizers] line-visualizer: plumb off-screen rendering mechanics
- Date: Tue, 27 Sep 2016 00:40:18 +0000 (UTC)
commit 24477d41cf4a7f17e78c3234a359087b3c6ce3f1
Author: Christian Hergert <chergert redhat com>
Date: Mon Sep 26 17:38:47 2016 -0700
line-visualizer: plumb off-screen rendering mechanics
This starts getting the mechanics in place for off screen
rendering using a cairo image surface. We create our own
point cache for storing x,y pairs and then simplify our
drawing based on that.
lib/sp-line-visualizer-row.c | 711 +++++++++++++++++++++++++++++++++++-------
lib/sp-line-visualizer-row.h | 3 -
2 files changed, 597 insertions(+), 117 deletions(-)
---
diff --git a/lib/sp-line-visualizer-row.c b/lib/sp-line-visualizer-row.c
index bd53601..cd69462 100644
--- a/lib/sp-line-visualizer-row.c
+++ b/lib/sp-line-visualizer-row.c
@@ -19,149 +19,199 @@
#define G_LOG_DOMAIN "sp-line-visualizer-row"
#include <stdlib.h>
+#include <string.h>
+#include "pointcache.h"
+#include "sp-capture-condition.h"
+#include "sp-capture-cursor.h"
#include "sp-line-visualizer-row.h"
typedef struct
{
+ /*
+ * Our reader as assigned by the visualizer system.
+ */
SpCaptureReader *reader;
- GHashTable *counters;
- GtkLabel *label;
+ /*
+ * An array of LineInfo which contains information about the counters
+ * we need to render.
+ */
+ GArray *lines;
+
+ /*
+ * This is our set of cached points to render. Once it is assigned here,
+ * it is immutable (and therefore may be shared with worker processes
+ * that are rendering the points).
+ */
+ PointCache *cache;
+ /*
+ * This is our offscreen surface that is already rendered. We use it
+ * to render to the front buffer (during our ::draw vfunc).
+ */
cairo_surface_t *surface;
- guint draw_sequence;
+
+ /*
+ * We track the draw sequence so that we only "consume" the newest
+ * draw operation after a threaded render completes.
+ */
+ guint draw_sequence;
+
+ /*
+ * Child widget to display the label in the upper corner.
+ */
+ GtkLabel *label;
+
+ /*
+ * Range of the scale for lower and upper.
+ */
+ gdouble y_lower;
+ gdouble y_upper;
+
+ /*
+ * If we have a new counter discovered or the reader is set, we might
+ * want to delay loading until we return to the main loop. This can
+ * help us avoid doing duplicate work.
+ */
+ guint queued_load;
} SpLineVisualizerRowPrivate;
typedef struct
{
- gint64 begin_time;
- gint64 end_time;
+ guint id;
+ gdouble line_width;
+ GdkRGBA background;
+ GdkRGBA foreground;
+} LineInfo;
+
+typedef struct
+{
+ PointCache *cache;
+ GArray *lines;
gint width;
gint height;
- guint sequence;
-} DrawRequest;
+} RenderData;
+
+typedef struct
+{
+ SpCaptureCursor *cursor;
+ GArray *lines;
+ PointCache *cache;
+ gint64 begin_time;
+ gint64 end_time;
+ gdouble y_lower;
+ gdouble y_upper;
+} LoadData;
G_DEFINE_TYPE_WITH_PRIVATE (SpLineVisualizerRow, sp_line_visualizer_row, SP_TYPE_VISUALIZER_ROW)
+static void sp_line_visualizer_row_load_data_async (SpLineVisualizerRow *self,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+static PointCache *sp_line_visualizer_row_load_data_finish (SpLineVisualizerRow *self,
+ GAsyncResult *result,
+ GError **error);
+static void sp_line_visualizer_row_render_async (SpLineVisualizerRow *self,
+ PointCache *cache,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+static cairo_surface_t *sp_line_visualizer_row_render_finish (SpLineVisualizerRow *self,
+ GAsyncResult *result,
+ GError **error);
+
enum {
PROP_0,
PROP_TITLE,
+ PROP_Y_LOWER,
+ PROP_Y_UPPER,
N_PROPS
};
static GParamSpec *properties [N_PROPS];
static void
-sp_line_visualizer_row_draw_worker (GTask *task,
- gpointer source_object,
- gpointer task_data,
- GCancellable *cancellable)
+load_data_free (gpointer data)
{
- SpLineVisualizerRow *self = source_object;
- DrawRequest *draw = task_data;
- cairo_surface_t *surface = NULL;
- cairo_t *cr = NULL;
-
- g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
- g_assert (G_IS_TASK (task));
- g_assert (draw != NULL);
- g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+ LoadData *load = data;
- /*
- * Create our image surface. We do this in the local thread and use
- * an image surface so that we can work around the lack of thread
- * safety in cairo and pixman. They are mostly thread unaware though,
- * so as long as we are really careful, we are okay.
- *
- * We draw using ARGB32 because the GtkListBoxRow will be doing it's
- * own pixel caching. This means we can concentrate on the line data
- * and ignore having to deal with backgrounds and such.
- */
- surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, draw->width, draw->height);
-
- if (surface == NULL)
+ if (load != NULL)
{
- g_task_return_new_error (task,
- G_IO_ERROR,
- G_IO_ERROR_FAILED,
- "Failed to create image surface of size %dx%d",
- draw->width, draw->height);
- goto cleanup;
+ g_clear_pointer (&load->lines, g_array_unref);
+ g_clear_object (&load->cursor);
+ g_clear_pointer (&load->cache, point_cache_unref);
+ g_slice_free (LoadData, load);
}
+}
- cr = cairo_create (surface);
+static void
+render_data_free (gpointer data)
+{
+ RenderData *render = data;
- if (cr == NULL)
+ if (render != NULL)
{
- g_task_return_new_error (task,
- G_IO_ERROR,
- G_IO_ERROR_FAILED,
- "Failed to create cairo context");
- goto cleanup;
+ g_clear_pointer (&render->cache, point_cache_unref);
+ g_clear_pointer (&render->lines, g_array_unref);
+ g_slice_free (RenderData, render);
}
+}
- g_task_return_pointer (task, g_steal_pointer (&surface), (GDestroyNotify)cairo_surface_destroy);
+static GArray *
+copy_array (GArray *ar)
+{
+ GArray *ret;
-cleanup:
- if (surface != NULL)
- cairo_surface_destroy (surface);
+ ret = g_array_sized_new (FALSE, FALSE, g_array_get_element_size (ar), ar->len);
+ g_array_set_size (ret, ar->len);
+ memcpy (ret->data, ar->data, ar->len * g_array_get_element_size (ret));
- if (cr != NULL)
- cairo_destroy (cr);
+ return ret;
}
static void
-complete_draw (GObject *object,
- GAsyncResult *result,
- gpointer user_data)
+sp_line_visualizer_row_render_cb (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data)
{
SpLineVisualizerRow *self = (SpLineVisualizerRow *)object;
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
- DrawRequest *draw;
- GTask *task = (GTask *)result;
+ g_autoptr(GError) error = NULL;
cairo_surface_t *surface;
g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
- g_assert (G_IS_TASK (task));
+ g_assert (G_IS_ASYNC_RESULT (result));
+ g_assert (user_data == NULL);
- draw = g_task_get_task_data (task);
- surface = g_task_propagate_pointer (task, NULL);
+ surface = sp_line_visualizer_row_render_finish (self, result, &error);
- if (surface != NULL && draw->sequence == priv->draw_sequence)
+ if (surface == NULL)
{
- g_clear_pointer (&priv->surface, cairo_surface_destroy);
- priv->surface = surface;
- gtk_widget_queue_draw (GTK_WIDGET (self));
+ g_warning ("%s", error->message);
+ return;
}
+
+ g_clear_pointer (&priv->surface, cairo_surface_destroy);
+ priv->surface = surface;
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
}
static void
-sp_line_visualizer_row_begin_draw (SpLineVisualizerRow *self)
+sp_line_visualizer_row_begin_offscreen_draw (SpLineVisualizerRow *self)
{
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
- g_autoptr(GTask) task = NULL;
- DrawRequest *draw;
- gint64 begin_time;
- gint64 end_time;
- GtkAllocation alloc;
g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
- sp_visualizer_row_get_time_range (SP_VISUALIZER_ROW (self), &begin_time, &end_time);
- gtk_widget_get_allocation (GTK_WIDGET (self), &alloc);
-
- draw = g_new (DrawRequest, 1);
- draw->begin_time = begin_time;
- draw->end_time = end_time;
- draw->width = alloc.width;
- draw->height = alloc.height;
- draw->sequence = ++priv->draw_sequence;
-
- task = g_task_new (self, NULL, complete_draw, NULL);
- g_task_set_source_tag (task, sp_line_visualizer_row_begin_draw);
- g_task_set_task_data (task, draw, g_free);
- g_task_run_in_thread (task, sp_line_visualizer_row_draw_worker);
+ if (priv->cache != NULL)
+ sp_line_visualizer_row_render_async (self,
+ priv->cache,
+ NULL,
+ sp_line_visualizer_row_render_cb,
+ NULL);
}
static gboolean
@@ -196,7 +246,7 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
*/
if (width != alloc.width || height != alloc.height)
{
-
+ /* TODO: Handle intermediate scaling */
return ret;
}
@@ -213,6 +263,66 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
}
static void
+sp_line_visualizer_row_load_data_cb (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data)
+{
+ SpLineVisualizerRow *self = (SpLineVisualizerRow *)object;
+ SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+ g_autoptr(GError) error = NULL;
+ g_autoptr(PointCache) cache = NULL;
+
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+
+ cache = sp_line_visualizer_row_load_data_finish (self, result, &error);
+
+ if (cache == NULL)
+ {
+ g_warning ("%s", error->message);
+ return;
+ }
+
+ g_clear_pointer (&priv->cache, point_cache_unref);
+ priv->cache = g_steal_pointer (&cache);
+
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+}
+
+static gboolean
+sp_line_visualizer_row_do_reload (gpointer data)
+{
+ SpLineVisualizerRow *self = data;
+ SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+
+ priv->queued_load = 0;
+
+ sp_line_visualizer_row_load_data_async (self,
+ NULL,
+ sp_line_visualizer_row_load_data_cb,
+ NULL);
+
+ return G_SOURCE_REMOVE;
+}
+
+static void
+sp_line_visualizer_row_queue_reload (SpLineVisualizerRow *self)
+{
+ SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+
+ if (priv->queued_load == 0)
+ {
+ priv->queued_load = gdk_threads_add_idle_full (G_PRIORITY_LOW,
+ sp_line_visualizer_row_do_reload,
+ self,
+ NULL);
+ }
+}
+
+static void
sp_line_visualizer_row_set_reader (SpVisualizerRow *row,
SpCaptureReader *reader)
{
@@ -232,31 +342,26 @@ sp_line_visualizer_row_set_reader (SpVisualizerRow *row,
if (reader != NULL)
priv->reader = sp_capture_reader_ref (reader);
- gtk_widget_queue_draw (GTK_WIDGET (self));
+ sp_line_visualizer_row_queue_reload (self);
}
}
static void
-sp_line_visualizer_row_real_prepare (SpLineVisualizerRow *self,
- cairo_t *cr,
- guint counter_id)
-{
- g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
- g_assert (cr != NULL);
-
- cairo_set_line_width (cr, 1.0);
- cairo_set_source_rgba (cr, 0, 0, 0, 0.4);
-}
-
-static void
sp_line_visualizer_row_finalize (GObject *object)
{
SpLineVisualizerRow *self = (SpLineVisualizerRow *)object;
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
- g_clear_pointer (&priv->counters, g_hash_table_unref);
+ g_clear_pointer (&priv->lines, g_array_unref);
+ g_clear_pointer (&priv->cache, point_cache_unref);
g_clear_pointer (&priv->reader, sp_capture_reader_unref);
+ if (priv->queued_load != 0)
+ {
+ g_source_remove (priv->queued_load);
+ priv->queued_load = 0;
+ }
+
G_OBJECT_CLASS (sp_line_visualizer_row_parent_class)->finalize (object);
}
@@ -271,7 +376,7 @@ sp_line_visualizer_row_size_allocate (GtkWidget *widget,
GTK_WIDGET_CLASS (sp_line_visualizer_row_parent_class)->size_allocate (widget, alloc);
- sp_line_visualizer_row_begin_draw (self);
+ sp_line_visualizer_row_begin_offscreen_draw (self);
}
static void
@@ -302,6 +407,14 @@ sp_line_visualizer_row_get_property (GObject *object,
g_object_get_property (G_OBJECT (priv->label), "label", value);
break;
+ case PROP_Y_LOWER:
+ g_value_set_double (value, priv->y_lower);
+ break;
+
+ case PROP_Y_UPPER:
+ g_value_set_double (value, priv->y_upper);
+ break;
+
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
@@ -322,6 +435,16 @@ sp_line_visualizer_row_set_property (GObject *object,
g_object_set_property (G_OBJECT (priv->label), "label", value);
break;
+ case PROP_Y_LOWER:
+ priv->y_lower = g_value_get_double (value);
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+ break;
+
+ case PROP_Y_UPPER:
+ priv->y_upper = g_value_get_double (value);
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+ break;
+
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
@@ -334,8 +457,6 @@ sp_line_visualizer_row_class_init (SpLineVisualizerRowClass *klass)
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
SpVisualizerRowClass *visualizer_class = SP_VISUALIZER_ROW_CLASS (klass);
- klass->prepare = sp_line_visualizer_row_real_prepare;
-
object_class->finalize = sp_line_visualizer_row_finalize;
object_class->get_property = sp_line_visualizer_row_get_property;
object_class->set_property = sp_line_visualizer_row_set_property;
@@ -353,6 +474,24 @@ sp_line_visualizer_row_class_init (SpLineVisualizerRowClass *klass)
NULL,
(G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ properties [PROP_Y_LOWER] =
+ g_param_spec_double ("y-lower",
+ "Y Lower",
+ "The lowest Y value for the visualizer",
+ -G_MAXDOUBLE,
+ G_MAXDOUBLE,
+ 0.0,
+ (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ properties [PROP_Y_UPPER] =
+ g_param_spec_double ("y-upper",
+ "Y Upper",
+ "The highest Y value for the visualizer",
+ -G_MAXDOUBLE,
+ G_MAXDOUBLE,
+ 100.0,
+ (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
g_object_class_install_properties (object_class, N_PROPS, properties);
}
@@ -362,7 +501,7 @@ sp_line_visualizer_row_init (SpLineVisualizerRow *self)
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
PangoAttrList *attrs = pango_attr_list_new ();
- priv->counters = g_hash_table_new (NULL, NULL);
+ priv->lines = g_array_new (FALSE, FALSE, sizeof (LineInfo));
pango_attr_list_insert (attrs, pango_attr_scale_new (PANGO_SCALE_SMALL * PANGO_SCALE_SMALL));
@@ -382,22 +521,24 @@ sp_line_visualizer_row_add_counter (SpLineVisualizerRow *self,
guint counter_id)
{
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+ LineInfo line_info = { 0 };
g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
- g_assert (priv->counters != NULL);
+ g_assert (priv->lines != NULL);
- g_hash_table_insert (priv->counters, GSIZE_TO_POINTER (counter_id), NULL);
+ line_info.id = counter_id;
+ line_info.foreground.alpha = 0.4;
+ line_info.background.alpha = 0.2;
+ line_info.line_width = 1.0;
+
+ g_array_append_val (priv->lines, line_info);
if (SP_LINE_VISUALIZER_ROW_GET_CLASS (self)->counter_added)
SP_LINE_VISUALIZER_ROW_GET_CLASS (self)->counter_added (self, counter_id);
- /*
- * We use queue_resize so that a size_allocate() is called
- * to kick off the new threaded draw of the widget. Otherwise,
- * we'd have to do our own queuing, so this simplifies things
- * a small bit.
- */
- gtk_widget_queue_resize (GTK_WIDGET (self));
+ g_print ("Adding counter: %d\n", counter_id);
+
+ sp_line_visualizer_row_queue_reload (self);
}
void
@@ -407,6 +548,348 @@ sp_line_visualizer_row_clear (SpLineVisualizerRow *self)
g_return_if_fail (SP_IS_LINE_VISUALIZER_ROW (self));
- g_hash_table_remove_all (priv->counters);
- gtk_widget_queue_resize (GTK_WIDGET (self));
+ if (priv->lines->len > 0)
+ g_array_remove_range (priv->lines, 0, priv->lines->len);
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static inline gboolean
+contains_id (GArray *ar,
+ guint id)
+{
+ for (guint i = 0; i < ar->len; i++)
+ {
+ const LineInfo *info = &g_array_index (ar, LineInfo, i);
+ if (info->id == id)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static inline guint8
+counter_type (LoadData *load,
+ guint counter_id)
+{
+ /* TODO: Support other counter types
+ *
+ * We need to keep some information on the counter (by id) so that we
+ * can track the counters type (which is a 1-byte type id).
+ */
+ return SP_CAPTURE_COUNTER_DOUBLE;
+}
+
+static gfloat
+calc_x (gint64 lower,
+ gint64 upper,
+ gint64 value)
+{
+ return (gdouble)(value - lower) / (gdouble)(upper - lower);
+}
+
+static gfloat
+calc_y_double (gdouble lower,
+ gdouble upper,
+ gdouble value)
+{
+ return (value - lower) / (upper - lower);
+}
+
+static gfloat
+calc_y_int64 (gint64 lower,
+ gint64 upper,
+ gint64 value)
+{
+ return (gdouble)(value - lower) / (gdouble)(upper - lower);
+}
+
+static gboolean
+sp_line_visualizer_row_load_data_frame_cb (const SpCaptureFrame *frame,
+ gpointer user_data)
+{
+ LoadData *load = user_data;
+
+ g_assert (frame != NULL);
+ g_assert (frame->type == SP_CAPTURE_FRAME_CTRSET ||
+ frame->type == SP_CAPTURE_FRAME_CTRDEF);
+ g_assert (load != NULL);
+
+ if (frame->type == SP_CAPTURE_FRAME_CTRSET)
+ {
+ const SpCaptureFrameCounterSet *set = (SpCaptureFrameCounterSet *)frame;
+ gfloat x = calc_x (load->begin_time, load->end_time, frame->time);
+
+ for (guint i = 0; i < set->n_values; i++)
+ {
+ const SpCaptureCounterValues *group = &set->values[i];
+
+ for (guint j = 0; j < G_N_ELEMENTS (group->ids); j++)
+ {
+ guint counter_id = group->ids[j];
+
+ if (counter_id != 0 && contains_id (load->lines, counter_id))
+ {
+ gfloat y;
+
+ if (counter_type (load, counter_id) == SP_CAPTURE_COUNTER_DOUBLE)
+ y = calc_y_double (load->y_lower, load->y_upper, group->values[j].vdbl);
+ else
+ y = calc_y_int64 (load->y_lower, load->y_upper, group->values[j].v64);
+
+ point_cache_add_point_to_set (load->cache, counter_id, x, y);
+ }
+ }
+ }
+ }
+
+ return TRUE;
+}
+
+static void
+sp_line_visualizer_row_load_data_worker (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ LoadData *load = task_data;
+ g_autoptr(GArray) counter_ids = NULL;
+
+ g_assert (G_IS_TASK (task));
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (source_object));
+ g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+ counter_ids = g_array_new (FALSE, FALSE, sizeof (guint));
+
+ for (guint i = 0; i < load->lines->len; i++)
+ {
+ const LineInfo *line_info = &g_array_index (load->lines, LineInfo, i);
+
+ g_array_append_val (counter_ids, line_info->id);
+ }
+
+ sp_capture_cursor_add_condition (load->cursor,
+ sp_capture_condition_new_where_counter_in (counter_ids->len,
+ (guint
*)(gpointer)counter_ids->data));
+ sp_capture_cursor_foreach (load->cursor, sp_line_visualizer_row_load_data_frame_cb, load);
+ g_task_return_pointer (task, g_steal_pointer (&load->cache), (GDestroyNotify)point_cache_unref);
+}
+
+static void
+sp_line_visualizer_row_load_data_async (SpLineVisualizerRow *self,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+ g_autoptr(GTask) task = NULL;
+ LoadData *load;
+
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+ g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+ task = g_task_new (self, cancellable, callback, user_data);
+ g_task_set_source_tag (task, sp_line_visualizer_row_load_data_async);
+
+ if (priv->reader == NULL)
+ {
+ g_task_return_new_error (task,
+ G_IO_ERROR,
+ G_IO_ERROR_FAILED,
+ "No data loaded");
+ return;
+ }
+
+ load = g_slice_new0 (LoadData);
+ load->cache = point_cache_new ();
+ load->y_lower = priv->y_lower;
+ load->y_upper = priv->y_upper;
+ sp_visualizer_row_get_time_range (SP_VISUALIZER_ROW (self), &load->begin_time, &load->end_time);
+ load->cursor = sp_capture_cursor_new (priv->reader);
+ load->lines = copy_array (priv->lines);
+
+ for (guint i = 0; i < load->lines->len; i++)
+ {
+ const LineInfo *line_info = &g_array_index (load->lines, LineInfo, i);
+
+ point_cache_add_set (load->cache, line_info->id);
+ }
+
+ g_task_set_task_data (task, load, load_data_free);
+ g_task_run_in_thread (task, sp_line_visualizer_row_load_data_worker);
+}
+
+static PointCache *
+sp_line_visualizer_row_load_data_finish (SpLineVisualizerRow *self,
+ GAsyncResult *result,
+ GError **error)
+{
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+ g_assert (G_IS_TASK (result));
+
+ return g_task_propagate_pointer (G_TASK (result), error);
+}
+
+static void
+sp_line_visualizer_row_render_worker (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ RenderData *render = task_data;
+ cairo_surface_t *surface = NULL;
+ cairo_t *cr = NULL;
+
+ g_assert (G_IS_TASK (task));
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (source_object));
+ g_assert (render != NULL);
+ g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+ /*
+ * Create our image surface. We do this in the local thread and use
+ * an image surface so that we can work around the lack of thread
+ * safety in cairo and pixman. They are mostly thread unaware though,
+ * so as long as we are really careful, we are okay.
+ *
+ * We draw using ARGB32 because the GtkListBoxRow will be doing it's
+ * own pixel caching. This means we can concentrate on the line data
+ * and ignore having to deal with backgrounds and such.
+ */
+ surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+ render->width,
+ render->height);
+
+ if (surface == NULL)
+ {
+ g_task_return_new_error (task,
+ G_IO_ERROR,
+ G_IO_ERROR_FAILED,
+ "Failed to create image surface of size %dx%d",
+ render->width, render->height);
+ goto cleanup;
+ }
+
+ cr = cairo_create (surface);
+
+ if (cr == NULL)
+ {
+ g_task_return_new_error (task,
+ G_IO_ERROR,
+ G_IO_ERROR_FAILED,
+ "Failed to create cairo context");
+ goto cleanup;
+ }
+
+ for (guint i = 0; i < render->lines->len; i++)
+ {
+ const LineInfo *info = &g_array_index (render->lines, LineInfo, i);
+ const Point *points;
+ guint n_points;
+
+ points = point_cache_get_points (render->cache, info->id, &n_points);
+
+ cairo_move_to (cr, 0, render->height);
+
+ gdk_cairo_set_source_rgba (cr, &info->foreground);
+ cairo_set_line_width (cr, info->line_width);
+
+ for (guint j = 0; j < n_points; j++)
+ {
+ const Point *p = &points[i];
+
+ cairo_line_to (cr, p->x * render->width, 1.0 - p->y * render->height);
+
+ if G_UNLIKELY (j + 1 == n_points)
+ {
+ cairo_stroke_preserve (cr);
+ cairo_line_to (cr, p->x * render->width, render->height);
+ }
+ }
+
+ cairo_line_to (cr, 0, render->height);
+
+ gdk_cairo_set_source_rgba (cr, &info->background);
+ cairo_fill (cr);
+ }
+
+ g_task_return_pointer (task,
+ g_steal_pointer (&surface),
+ (GDestroyNotify)cairo_surface_destroy);
+
+cleanup:
+ if (surface != NULL)
+ cairo_surface_destroy (surface);
+
+ if (cr != NULL)
+ cairo_destroy (cr);
+}
+
+/**
+ * sp_line_visualizer_row_render_async:
+ * @self: an #SpLineVisualizerRow
+ * @cache: (transfer full): A #PointCache with points to render
+ * @lines: (transfer full): information about the lines
+ * @n_lines: number of lines to render
+ * @cancellable: (nullable): A #GCancellable or %NULL
+ * @callback: a callback for completion
+ * @user_data: user data for @callback
+ *
+ * This asynchronously renders the visuzlier to an offscreen
+ * cairo_image_surface_t which cna then be rendered to the front
+ * buffer as necessary.
+ *
+ * Call sp_line_visualizer_row_render_finish() to get the rendered
+ * image surface.
+ */
+static void
+sp_line_visualizer_row_render_async (SpLineVisualizerRow *self,
+ PointCache *cache,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
+ RenderData *render;
+ g_autoptr(GTask) task = NULL;
+ GtkAllocation alloc;
+
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+ g_assert (cache != NULL);
+ g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+ gtk_widget_get_allocation (GTK_WIDGET (self), &alloc);
+
+ task = g_task_new (self, cancellable, callback, user_data);
+ g_task_set_source_tag (task, sp_line_visualizer_row_render_async);
+
+ render = g_slice_new0 (RenderData);
+ render->cache = point_cache_ref (cache);
+ render->lines = copy_array (priv->lines);
+ render->width = alloc.width;
+ render->height = alloc.height;
+
+ g_task_set_task_data (task, render, render_data_free);
+ g_task_run_in_thread (task, sp_line_visualizer_row_render_worker);
+}
+
+/**
+ * sp_line_visualizer_row_render_finish:
+ *
+ * This completes an asynchronous request to render the visualizer.
+ * The resulting cairo_surface_t will really be a cairo_image_surface_t.
+ * We do not use a "similar surface" because we need to ensure that
+ * the render can be performed in a thread-safe manner as it is
+ * dispatched to another thread.
+ *
+ * Returns: (transfer full): A #cairo_image_surface_t.
+ */
+static cairo_surface_t *
+sp_line_visualizer_row_render_finish (SpLineVisualizerRow *self,
+ GAsyncResult *result,
+ GError **error)
+{
+ g_assert (SP_IS_LINE_VISUALIZER_ROW (self));
+ g_assert (G_IS_TASK (result));
+
+ return g_task_propagate_pointer (G_TASK (result), error);
}
diff --git a/lib/sp-line-visualizer-row.h b/lib/sp-line-visualizer-row.h
index 61c5cf2..d992c5e 100644
--- a/lib/sp-line-visualizer-row.h
+++ b/lib/sp-line-visualizer-row.h
@@ -33,9 +33,6 @@ struct _SpLineVisualizerRowClass
void (*counter_added) (SpLineVisualizerRow *self,
guint counter_id);
- void (*prepare) (SpLineVisualizerRow *self,
- cairo_t *cr,
- guint counter_id);
gpointer _reserved1;
gpointer _reserved2;
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