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improved calculation of text color based on the splash image (bug 

2006-06-28  Sven Neumann  <sven@gimp.org>

	* app/gui/splash.c: improved calculation of text color based on
	the splash image (bug #165760).
This commit is contained in:
Sven Neumann 2006-06-28 18:39:13 +00:00 committed by Sven Neumann
parent 6c42c4fcc8
commit 59056d8d9a
2 changed files with 117 additions and 86 deletions
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5
ChangeLog
View File

@ -1,3 +1,8 @@
2006-06-28 Sven Neumann <sven@gimp.org>
* app/gui/splash.c: improved calculation of text color based on
the splash image (bug #165760).
2006-06-28 Sven Neumann <sven@gimp.org>
* app/menus/plug-in-menus.c (plug_in_menus_setup): generate unique

198
app/gui/splash.c
View File

@ -59,6 +59,10 @@ static GimpSplash *splash = NULL;
static void splash_map (void);
static void splash_position_layouts (GimpSplash *splash,
const gchar *text1,
const gchar *text2,
GdkRectangle *area);
static gboolean splash_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpSplash *splash);
@ -66,7 +70,7 @@ static void splash_rectangle_union (GdkRectangle *dest,
PangoRectangle *pango_rect,
gint offset_x,
gint offset_y);
static gboolean splash_average_bottom (GtkWidget *widget,
static gboolean splash_average_text_area (GimpSplash *splash,
GdkPixbuf *pixbuf,
GdkColor *color);
@ -155,11 +159,27 @@ splash_create (void)
gtk_widget_set_size_request (splash->area, splash->width, splash->height);
gtk_widget_realize (splash->area);
/* create the pango layouts */
splash->upper = gtk_widget_create_pango_layout (splash->area, "");
splash->lower = gtk_widget_create_pango_layout (splash->area, "");
splash_average_bottom (splash->area,
gdk_pixbuf_animation_get_static_image (pixbuf),
&values.foreground);
attrs = pango_attr_list_new ();
attr = pango_attr_weight_new (PANGO_WEIGHT_BOLD);
attr->start_index = 0;
attr->end_index = -1;
pango_attr_list_insert (attrs, attr);
pango_layout_set_attributes (splash->upper, attrs);
pango_attr_list_unref (attrs);
/* this sets the initial layout positions */
splash_position_layouts (splash, "", "", NULL);
splash_average_text_area (splash,
gdk_pixbuf_animation_get_static_image (pixbuf),
&values.foreground);
gtk_widget_realize (splash->area);
splash->gc = gdk_gc_new_with_values (splash->area->window, &values,
GDK_GC_FOREGROUND);
@ -182,19 +202,6 @@ splash_create (void)
G_CALLBACK (splash_area_expose),
splash);
/* create the pango layouts */
splash->upper = gtk_widget_create_pango_layout (splash->area, "");
splash->lower = gtk_widget_create_pango_layout (splash->area, "");
attrs = pango_attr_list_new ();
attr = pango_attr_weight_new (PANGO_WEIGHT_BOLD);
attr->start_index = 0;
attr->end_index = -1;
pango_attr_list_insert (attrs, attr);
pango_layout_set_attributes (splash->upper, attrs);
pango_attr_list_unref (attrs);
/* add a progress bar */
splash->progress = gtk_progress_bar_new ();
gtk_box_pack_end (GTK_BOX (vbox), splash->progress, FALSE, FALSE, 0);
@ -234,11 +241,7 @@ splash_update (const gchar *text1,
const gchar *text2,
gdouble percentage)
{
GdkRectangle expose = { 0, 0, 0, 0 };
PangoRectangle ink;
PangoRectangle logical;
gint width;
gint height;
GdkRectangle expose = { 0, 0, 0, 0 };
g_return_if_fail (percentage >= 0.0 && percentage <= 1.0);
@ -249,36 +252,7 @@ splash_update (const gchar *text1,
splash_timer_elapsed (text1, text2, percentage);
#endif
width = splash->area->allocation.width;
height = splash->area->allocation.height;
if (text1)
{
pango_layout_get_pixel_extents (splash->upper, &ink, NULL);
splash_rectangle_union (&expose, &ink, splash->upper_x, splash->upper_y);
pango_layout_set_text (splash->upper, text1, -1);
pango_layout_get_pixel_extents (splash->upper, &ink, &logical);
splash->upper_x = (width - logical.width) / 2;
splash->upper_y = height - 2 * (logical.height + 6);
splash_rectangle_union (&expose, &ink, splash->upper_x, splash->upper_y);
}
if (text2)
{
pango_layout_get_pixel_extents (splash->lower, &ink, NULL);
splash_rectangle_union (&expose, &ink, splash->lower_x, splash->lower_y);
pango_layout_set_text (splash->lower, text2, -1);
pango_layout_get_pixel_extents (splash->lower, &ink, &logical);
splash->lower_x = (width - logical.width) / 2;
splash->lower_y = height - (logical.height + 6);
splash_rectangle_union (&expose, &ink, splash->lower_x, splash->lower_y);
}
splash_position_layouts (splash, text1, text2, &expose);
if (expose.width > 0 && expose.height > 0)
gtk_widget_queue_draw_area (splash->area,
@ -320,6 +294,51 @@ splash_map (void)
gtk_window_set_auto_startup_notification (TRUE);
}
/* area returns the union of the previous and new ink rectangles */
static void
splash_position_layouts (GimpSplash *splash,
const gchar *text1,
const gchar *text2,
GdkRectangle *area)
{
PangoRectangle ink;
PangoRectangle logical;
if (text1)
{
pango_layout_get_pixel_extents (splash->upper, &ink, NULL);
if (area)
splash_rectangle_union (area, &ink, splash->upper_x, splash->upper_y);
pango_layout_set_text (splash->upper, text1, -1);
pango_layout_get_pixel_extents (splash->upper, &ink, &logical);
splash->upper_x = (splash->width - logical.width) / 2;
splash->upper_y = splash->height - 2 * (logical.height + 6);
if (area)
splash_rectangle_union (area, &ink, splash->upper_x, splash->upper_y);
}
if (text2)
{
pango_layout_get_pixel_extents (splash->lower, &ink, NULL);
if (area)
splash_rectangle_union (area, &ink, splash->lower_x, splash->lower_y);
pango_layout_set_text (splash->lower, text2, -1);
pango_layout_get_pixel_extents (splash->lower, &ink, &logical);
splash->lower_x = (splash->width - logical.width) / 2;
splash->lower_y = splash->height - (logical.height + 6);
if (area)
splash_rectangle_union (area, &ink, splash->lower_x, splash->lower_y);
}
}
static void
splash_rectangle_union (GdkRectangle *dest,
PangoRectangle *pango_rect,
@ -340,61 +359,68 @@ splash_rectangle_union (GdkRectangle *dest,
}
/* This function chooses a gray value for the text color, based on
* the average intensity of the lower 60 rows of the splash image.
* the average luminance of the text area of the splash image.
*/
static gboolean
splash_average_bottom (GtkWidget *widget,
GdkPixbuf *pixbuf,
GdkColor *color)
splash_average_text_area (GimpSplash *splash,
GdkPixbuf *pixbuf,
GdkColor *color)
{
const guchar *pixels;
gint x, y;
gint width, height;
gint rowstride;
gint channels;
gint luminance;
gint count;
guint sum[3] = { 0, 0, 0 };
gint luminance = 0;
guint sum[3] = { 0, 0, 0 };
GdkRectangle image = { 0, 0, 0, 0 };
GdkRectangle area = { 0, 0, 0, 0 };
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);
g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8, FALSE);
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
channels = gdk_pixbuf_get_n_channels (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
image.width = gdk_pixbuf_get_width (pixbuf);
image.height = gdk_pixbuf_get_height (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
channels = gdk_pixbuf_get_n_channels (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
y = MAX (0, height - 60);
count = width * (height - y);
splash_position_layouts (splash, "Short text", "Somewhat longer text", &area);
pixels += y * rowstride;
for (; y < height; y++)
if (gdk_rectangle_intersect (&image, &area, &area))
{
const guchar *src = pixels;
const gint count = area.width * area.height;
gint x, y;
for (x = 0; x < width; x++)
pixels += area.x * channels;
pixels += area.y * rowstride;
for (y = 0; y < area.height; y++)
{
sum[0] += src[0];
sum[1] += src[1];
sum[2] += src[2];
const guchar *src = pixels;
src += channels;
for (x = 0; x < area.width; x++)
{
sum[0] += src[0];
sum[1] += src[1];
sum[2] += src[2];
src += channels;
}
pixels += rowstride;
}
pixels += rowstride;
luminance = GIMP_RGB_LUMINANCE (sum[0] / count,
sum[1] / count,
sum[2] / count);
luminance = CLAMP0255 (luminance > 127 ?
luminance - 223 : luminance + 223);
}
luminance = GIMP_RGB_LUMINANCE (sum[0] / count,
sum[1] / count,
sum[2] / count);
luminance = CLAMP0255 (luminance > 127 ? luminance - 223 : luminance + 223);
color->red = color->green = color->blue = (luminance << 8 | luminance);
return gdk_colormap_alloc_color (gtk_widget_get_colormap (widget),
return gdk_colormap_alloc_color (gtk_widget_get_colormap (splash->area),
color, FALSE, TRUE);
}