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157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
#include <gmodule.h>
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#include <clutter/clutter.h>
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#include <string.h>
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#define DOT_SIZE 2
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#define TEX_SIZE 64
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typedef struct _CallbackData CallbackData;
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struct _CallbackData
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{
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ClutterActor *stage;
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ClutterActor *tex;
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ClutterActor *box;
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ClutterMotionEvent event;
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guint idle_source;
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};
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static ClutterActor *
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make_label (void)
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{
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ClutterActor *label;
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gchar *text;
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gchar *argv[] = { "ls", "--help", NULL };
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label = clutter_text_new ();
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clutter_text_set_font_name (CLUTTER_TEXT (label), "Sans 10");
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if (g_spawn_sync (NULL, argv, NULL,
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G_SPAWN_STDERR_TO_DEV_NULL | G_SPAWN_SEARCH_PATH,
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NULL, NULL, &text, NULL, NULL, NULL))
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{
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clutter_text_set_text (CLUTTER_TEXT (label), text);
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g_free (text);
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}
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return label;
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}
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static ClutterActor *
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make_tex (void)
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{
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ClutterActor *tex = clutter_texture_new ();
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clutter_actor_set_size (tex, TEX_SIZE * 2, TEX_SIZE * 2);
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return tex;
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}
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static ClutterActor *
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make_box (void)
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{
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ClutterActor *box;
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static const ClutterColor blue = { 0x00, 0x00, 0xff, 0xff };
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box = clutter_rectangle_new_with_color (&blue);
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clutter_actor_set_size (box, DOT_SIZE + 2, DOT_SIZE + 2);
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clutter_actor_hide (box);
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return box;
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}
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static gboolean
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on_motion_idle (gpointer user_data)
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{
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CallbackData *data = (CallbackData *) user_data;
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guchar *pixels, *p;
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guint stage_width, stage_height;
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gint x, y;
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data->idle_source = 0;
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clutter_actor_get_size (data->stage, &stage_width, &stage_height);
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x = CLAMP (data->event.x - TEX_SIZE / 2, 0, (int) stage_width - TEX_SIZE);
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y = CLAMP (data->event.y - TEX_SIZE / 2, 0, (int) stage_height - TEX_SIZE);
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clutter_actor_set_position (data->box, x + TEX_SIZE / 2 - 1,
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y + TEX_SIZE / 2 - 1);
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clutter_actor_show (data->box);
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/* Redraw so that the layouting will be done and the box will be
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drawn in the right position */
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clutter_redraw (CLUTTER_STAGE (data->stage));
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pixels = clutter_stage_read_pixels (CLUTTER_STAGE (data->stage),
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x, y, TEX_SIZE, TEX_SIZE);
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/* Make a red dot in the center */
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p = pixels + (TEX_SIZE / 2 - DOT_SIZE / 2) * TEX_SIZE * 4
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+ (TEX_SIZE / 2 - DOT_SIZE / 2) * 4;
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for (y = 0; y < DOT_SIZE; y++)
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{
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for (x = 0; x < DOT_SIZE; x++)
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{
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*(p++) = 255;
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memset (p, 0, 3);
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p += 3;
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}
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p += TEX_SIZE * 4 - DOT_SIZE * 4;
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}
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/* Set all of the alpa values to full */
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for (p = pixels + TEX_SIZE * TEX_SIZE * 4; p > pixels; p -= 4)
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*(p - 1) = 255;
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clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (data->tex),
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pixels, TRUE,
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TEX_SIZE, TEX_SIZE,
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TEX_SIZE * 4, 4, 0, NULL);
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g_free (pixels);
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return FALSE;
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}
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static gboolean
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on_motion (ClutterActor *stage, ClutterMotionEvent *event, CallbackData *data)
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{
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/* Handle the motion event in an idle handler so that multiple
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events will be combined into one */
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if (data->idle_source == 0)
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data->idle_source = clutter_threads_add_idle (on_motion_idle, data);
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data->event = *event;
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return FALSE;
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}
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G_MODULE_EXPORT int
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test_stage_read_pixels_main (int argc, char **argv)
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{
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CallbackData data;
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clutter_init (&argc, &argv);
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data.idle_source = 0;
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data.stage = clutter_stage_get_default ();
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data.tex = make_tex ();
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data.box = make_box ();
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clutter_actor_set_position (data.tex,
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clutter_actor_get_width (data.stage)
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- clutter_actor_get_width (data.tex),
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clutter_actor_get_height (data.stage)
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- clutter_actor_get_height (data.tex));
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clutter_container_add (CLUTTER_CONTAINER (data.stage),
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make_label (), data.tex, data.box, NULL);
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g_signal_connect (data.stage, "motion-event", G_CALLBACK (on_motion), &data);
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clutter_actor_show (data.stage);
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clutter_main ();
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return 0;
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}
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