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modules: port ColorselWater drawing to cairo

This commit is contained in:
Michael Natterer 2010-08-09 00:14:35 +02:00
parent fe72f5985b
commit 62c4387a26
1 changed files with 39 additions and 22 deletions
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61
modules/color-selector-water.c
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@ -60,7 +60,7 @@ struct _ColorselWaterClass
GType colorsel_water_get_type (void);
static void select_area_expose (GtkWidget *widget,
static gboolean select_area_expose (GtkWidget *widget,
GdkEventExpose *event);
static gboolean button_press_event (GtkWidget *widget,
GdkEventButton *event,
@ -199,24 +199,35 @@ calc (gdouble x,
return 128 + (x - 0.5) * c - (y - 0.5) * s;
}
static void
static gboolean
select_area_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkStyle *style = gtk_widget_get_style (widget);
GtkAllocation allocation;
gdouble dx;
gdouble dy;
guchar *buf = g_alloca (3 * event->area.width * event->area.height);
guchar *dest = buf;
gdouble y;
gint i, j;
cairo_t *cr;
GtkAllocation allocation;
gdouble dx;
gdouble dy;
cairo_surface_t *surface;
guchar *dest;
gdouble y;
gint j;
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
gtk_widget_get_allocation (widget, &allocation);
dx = 1.0 / allocation.width;
dy = 1.0 / allocation.height;
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
event->area.width,
event->area.height);
dest = cairo_image_surface_get_data (surface);
for (j = 0, y = event->area.y / allocation.height;
j < event->area.height;
j++, y += dy)
@ -231,33 +242,39 @@ select_area_expose (GtkWidget *widget,
gdouble dg = calc (dx, y, 120) - g;
gdouble db = calc (dx, y, 240) - b;
gint i;
r += event->area.x * dr;
g += event->area.x * dg;
b += event->area.x * db;
for (i = 0; i < event->area.width; i++)
{
d[0] = CLAMP ((gint) r, 0, 255);
d[1] = CLAMP ((gint) g, 0, 255);
d[2] = CLAMP ((gint) b, 0, 255);
GIMP_CAIRO_RGB24_SET_PIXEL (d,
CLAMP ((gint) r, 0, 255),
CLAMP ((gint) g, 0, 255),
CLAMP ((gint) b, 0, 255));
r += dr;
g += dg;
b += db;
d += 3;
d += 4;
}
dest += event->area.width * 3;
dest += cairo_image_surface_get_stride (surface);
}
gdk_draw_rgb_image_dithalign (gtk_widget_get_window (widget),
style->fg_gc[gtk_widget_get_state (widget)],
event->area.x, event->area.y,
event->area.width, event->area.height,
GDK_RGB_DITHER_MAX,
buf, 3 * event->area.width,
-event->area.x, -event->area.y);
cairo_surface_mark_dirty (surface);
cairo_set_source_surface (cr, surface,
event->area.x, event->area.y);
cairo_surface_destroy (surface);
cairo_paint (cr);
cairo_destroy (cr);
return FALSE;
}
static void