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GtkThemingEngine: Implement animations between gradients/colors.

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This commit is contained in:
Carlos Garnacho 2010-10-05 10:55:40 +02:00
parent d8187b34bb
commit 908babd8ae
1 changed files with 152 additions and 0 deletions
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152
gtk/gtkthemingengine.c
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@ -896,6 +896,8 @@ gtk_theming_engine_render_background (GtkThemingEngine *engine,
GdkColor *bg_color, *base_color;
cairo_pattern_t *pattern;
GtkStateFlags flags;
gboolean prelight;
gdouble progress;
flags = gtk_theming_engine_get_state (engine);
cairo_save (cr);
@ -915,6 +917,156 @@ gtk_theming_engine_render_background (GtkThemingEngine *engine,
"base-color", &base_color,
NULL);
prelight = gtk_theming_engine_is_state_set (engine, GTK_STATE_PRELIGHT, &progress);
if (prelight || progress > 0 )
{
cairo_pattern_t *other_pattern;
GtkStateFlags other_flags;
GdkColor *other_bg, *other_base;
cairo_pattern_t *new_pattern = NULL;
if (prelight)
{
other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
progress = 1 - progress;
}
else
other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
gtk_theming_engine_get (engine, other_flags,
"background-image", &other_pattern,
"background-color", &other_bg,
"base-color", &other_base,
NULL);
if (pattern && other_pattern)
{
gdouble offset0, red0, green0, blue0, alpha0;
gdouble offset1, red1, green1, blue1, alpha1;
gdouble x00, x01, y00, y01, x10, x11, y10, y11;
gint n0, n1;
guint i;
cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
y00 + (y10 - y00) * progress,
x01 + (x11 - x01) * progress,
y01 + (y11 - y01) * progress);
cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
cairo_pattern_get_color_stop_count (pattern, &n0);
cairo_pattern_get_color_stop_count (other_pattern, &n1);
i = 0;
/* Blend both gradients into one */
while (i < n0 && i < n1)
{
cairo_pattern_get_color_stop_rgba (pattern, i,
&offset0,
&red0, &green0, &blue0,
&alpha0);
cairo_pattern_get_color_stop_rgba (other_pattern, i,
&offset1,
&red1, &green1, &blue1,
&alpha1);
cairo_pattern_add_color_stop_rgba (new_pattern,
offset0 + ((offset1 - offset0) * progress),
red0 + ((red1 - red0) * progress),
green0 + ((green1 - green0) * progress),
blue0 + ((blue1 - blue0) * progress),
alpha0 + ((alpha1 - alpha0) * progress));
i++;
}
/* FIXME: Handle remaining color stops in both source patterns */
}
else if (pattern || other_pattern)
{
cairo_pattern_t *p;
GdkColor *c;
gdouble x0, y0, x1, y1;
gdouble red0, green0, blue0;
gdouble red1, green1, blue1;
gint n, i;
/* Blend a pattern with a color */
if (pattern)
{
p = pattern;
c = gtk_theming_engine_has_class (engine, "entry") ? other_base : other_bg;
progress = 1 - progress;
}
else
{
p = other_pattern;
c = gtk_theming_engine_has_class (engine, "entry") ? base_color : bg_color;
}
cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
cairo_pattern_get_color_stop_count (p, &n);
red0 = c->red / 65535.;
green0 = c->green / 65535.;
blue0 = c->blue / 65535.;
for (i = 0; i < n; i++)
{
gdouble offset, alpha;
cairo_pattern_get_color_stop_rgba (p, i,
&offset,
&red1, &green1, &blue1,
&alpha);
cairo_pattern_add_color_stop_rgba (new_pattern, offset,
red0 + ((red1 - red0) * progress),
green0 + ((green1 - green0) * progress),
blue0 + ((blue1 - blue0) * progress),
alpha + ((1 - alpha) * progress));
}
}
else
{
const GdkColor *color, *other_color;
/* Merge just colors */
if (gtk_theming_engine_has_class (engine, "entry"))
{
color = base_color;
other_color = other_base;
}
else
{
color = bg_color;
other_color = other_bg;
}
new_pattern = cairo_pattern_create_rgb ((gdouble) (color->red + ((other_color->red - color->red) * progress)) / 65535.,
(gdouble) (color->green + ((other_color->green - color->green) * progress)) / 65535.,
(gdouble) (color->blue + ((other_color->blue - color->blue) * progress)) / 65535.);
}
if (new_pattern)
{
/* Replace pattern to use */
cairo_pattern_destroy (pattern);
pattern = new_pattern;
}
if (other_pattern)
cairo_pattern_destroy (other_pattern);
if (other_bg)
gdk_color_free (other_bg);
if (other_base)
gdk_color_free (other_base);
}
if (pattern)
{
cairo_translate (cr, x, y);