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[debug] Guard the use of gdk_pixbuf for pick debugging by #ifdef USE_GDKPIXBUF
gdk is an optional clutter dependency, so the pick buffer debugging option needs some guards so we don't break, for example, the OSX builds. This also adds a comment for the bit fiddling done on the pick colors used to ensure the pick colors are more distinguished while debugging. (we swap the nibbles of each color component so that pick buffers don't just look black.)
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@ -38,7 +38,9 @@
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#include <glib/gi18n-lib.h>
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#include <locale.h>
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#ifdef USE_GDKPIXBUF
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#endif
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#include "clutter-event.h"
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#include "clutter-backend.h"
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@ -340,6 +342,11 @@ _clutter_id_to_color (guint id, ClutterColor *col)
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col->blue = blue;
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col->alpha = 0xff;
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/* XXX: We rotate the nibbles of the colors here so that there is a
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* visible variation between colors of sequential actor identifiers;
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* otherwise pick buffers dumped to an image will pretty much just look
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* black.
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*/
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if (G_UNLIKELY (clutter_debug_flags & CLUTTER_DEBUG_DUMP_PICK_BUFFERS))
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{
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col->red = (col->red << 4) | (col->red >> 4);
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@ -363,6 +370,12 @@ _clutter_pixel_to_id (guchar pixel[4])
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if (G_UNLIKELY (clutter_debug_flags & CLUTTER_DEBUG_DUMP_PICK_BUFFERS))
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{
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guchar tmp;
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/* XXX: In _clutter_id_to_color we rotated the nibbles of the colors so
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* that there is a visible variation between colors of sequential actor
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* identifiers (otherwise pick buffers dumped to an image will pretty
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* much just look black.) Here we reverse that rotation.
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*/
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tmp = ((pixel[0] << 4) | (pixel[0] >> 4));
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red = tmp >> (8 - ctx->fb_r_mask);
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tmp = ((pixel[1] << 4) | (pixel[1] >> 4));
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@ -389,11 +402,13 @@ _clutter_pixel_to_id (guchar pixel[4])
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return id;
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}
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#ifdef USE_GDKPIXBUF
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static void
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pixbuf_free (guchar *pixels, gpointer data)
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{
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g_free (pixels);
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}
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#endif
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static void
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read_pixels_to_file (char *filename_stem,
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@ -402,6 +417,7 @@ read_pixels_to_file (char *filename_stem,
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int width,
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int height)
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{
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#ifdef USE_GDKPIXBUF
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GLubyte *data;
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GdkPixbuf *pixbuf;
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static int read_count = 0;
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@ -439,6 +455,15 @@ read_pixels_to_file (char *filename_stem,
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g_object_unref (flipped);
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read_count++;
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}
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#else
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static gboolean seen = FALSE;
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if (!seen)
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{
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g_warning ("dumping buffers to an image isn't supported on platforms "
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"without gdk pixbuf support\n");
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seen = TRUE;
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}
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#endif
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}
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ClutterActor *
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