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themingengine: use cairo image surfaces to render state effects

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This makes the code cleaner and allows this to be re-used in a
pixbuf-less future.
This commit is contained in:
Cosimo Cecchi 2011-06-06 10:23:44 -04:00 committed by Benjamin Otte
parent 2446aef0ea
commit 0cd810ff7c
1 changed files with 40 additions and 47 deletions
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87
gtk/gtkthemingengine.c
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@ -3130,53 +3130,24 @@ lookup_icon_size (GtkThemingEngine *engine,
return gtk_icon_size_lookup_for_settings (settings, size, width, height);
}
/* Kudos to the gnome-panel guys. */
static void
colorshift_pixbuf (GdkPixbuf *src,
GdkPixbuf *dest,
gint shift)
colorshift_source (cairo_t *cr,
gdouble shift)
{
gint i, j;
gint width, height, has_alpha, src_rowstride, dest_rowstride;
guchar *target_pixels;
guchar *original_pixels;
guchar *pix_src;
guchar *pix_dest;
int val;
guchar r, g, b;
cairo_pattern_t *source;
has_alpha = gdk_pixbuf_get_has_alpha (src);
width = gdk_pixbuf_get_width (src);
height = gdk_pixbuf_get_height (src);
src_rowstride = gdk_pixbuf_get_rowstride (src);
dest_rowstride = gdk_pixbuf_get_rowstride (dest);
original_pixels = gdk_pixbuf_get_pixels (src);
target_pixels = gdk_pixbuf_get_pixels (dest);
cairo_save (cr);
cairo_paint (cr);
for (i = 0; i < height; i++)
{
pix_dest = target_pixels + i * dest_rowstride;
pix_src = original_pixels + i * src_rowstride;
source = cairo_pattern_reference (cairo_get_source (cr));
for (j = 0; j < width; j++)
{
r = *(pix_src++);
g = *(pix_src++);
b = *(pix_src++);
cairo_set_source_rgb (cr, shift, shift, shift);
cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
val = r + shift;
*(pix_dest++) = CLAMP (val, 0, 255);
cairo_mask (cr, source);
val = g + shift;
*(pix_dest++) = CLAMP (val, 0, 255);
val = b + shift;
*(pix_dest++) = CLAMP (val, 0, 255);
if (has_alpha)
*(pix_dest++) = *(pix_src++);
}
}
cairo_pattern_destroy (source);
cairo_restore (cr);
}
static GdkPixbuf *
@ -3190,6 +3161,8 @@ gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine *engine,
GtkStateFlags state;
gint width = 1;
gint height = 1;
cairo_t *cr;
cairo_surface_t *surface;
base_pixbuf = gtk_icon_source_get_pixbuf (source);
state = gtk_theming_engine_get_state (engine);
@ -3217,16 +3190,36 @@ gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine *engine,
{
if (state & GTK_STATE_FLAG_INSENSITIVE)
{
stated = gdk_pixbuf_copy (scaled);
gdk_pixbuf_saturate_and_pixelate (scaled, stated,
0.8, TRUE);
g_object_unref (scaled);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
gdk_pixbuf_get_width (scaled),
gdk_pixbuf_get_height (scaled));
cr = cairo_create (surface);
gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
cairo_paint_with_alpha (cr, 0.5);
cairo_destroy (cr);
g_object_unref (scaled);
stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
}
else if (state & GTK_STATE_FLAG_PRELIGHT)
{
stated = gdk_pixbuf_copy (scaled);
colorshift_pixbuf (scaled, stated, 30);
g_object_unref (scaled);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
gdk_pixbuf_get_width (scaled),
gdk_pixbuf_get_height (scaled));
cr = cairo_create (surface);
gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
colorshift_source (cr, 0.10);
cairo_destroy (cr);
g_object_unref (scaled);
stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
}
else
stated = scaled;