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951e7d8e034ec58afa6f04ea4b4528c49d7682d6
gimp/app/gui/splash.c
Jehan 951e7d8e03 app: fix some glitches in the splash status text. 
These small glitches have bothered me for a while now, so I finally
fixed these before the dev release!
Basically there were 2 fixes:
1. use the ink extents to compute any drawn area as this is what will be
   actually drawn.
2. Not only expose the drawn area of the new text, but also the one of
   the previous text in order to be sure all text pixels are correctly
   reset (in case the new text is smaller than previous one). I.e. we
   must expose the smallest rectangle containing both previous and new
   area of text.

(cherry picked from commit 3a50e52ac7)
2020-10-26 20:18:24 +01:00

731 lines
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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "gui-types.h"
#include "widgets/gimpwidgets-utils.h"
#include "splash.h"
#include "gimp-intl.h"
#define MEASURE_UPPER "1235678901234567890"
#define MEASURE_LOWER "12356789012345678901234567890"
typedef struct
{
GtkWidget *window;
GtkWidget *area;
gint width;
gint height;
GtkWidget *progress;
GdkColor color;
PangoLayout *upper;
gint upper_x;
gint upper_y;
PangoLayout *lower;
gint lower_x;
gint lower_y;
gdouble percentage;
gchar *text1;
gchar *text2;
/* debug timer */
GTimer *timer;
gdouble last_time;
} GimpSplash;
static GimpSplash *splash = NULL;
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);
static void splash_rectangle_union (GdkRectangle *dest,
PangoRectangle *pango_rect,
gint offset_x,
gint offset_y);
static gboolean splash_average_text_area (GimpSplash *splash,
GdkPixbuf *pixbuf,
GdkColor *color);
static GdkPixbufAnimation *
splash_image_load (gint max_width,
gint max_height,
gboolean be_verbose);
static GdkPixbufAnimation *
splash_image_load_from_path (const gchar *filename,
gint max_width,
gint max_height,
gboolean be_verbose);
static GdkPixbufAnimation *
splash_image_load_from_file (GFile *file,
gint max_width,
gint max_height,
gboolean be_verbose);
static GdkPixbufAnimation *
splash_image_pick_from_dirs (GList *dirs,
gint max_width,
gint max_height,
gboolean be_verbose);
static void splash_timer_elapsed (void);
/* public functions */
void
splash_create (gboolean be_verbose,
GdkScreen *screen,
gint monitor)
{
GtkWidget *frame;
GtkWidget *vbox;
GdkPixbufAnimation *pixbuf;
PangoRectangle ink;
gint max_width;
gint max_height;
g_return_if_fail (splash == NULL);
g_return_if_fail (GDK_IS_SCREEN (screen));
max_width = gdk_screen_get_width (screen) / 2;
max_height = gdk_screen_get_height (screen) / 2;
pixbuf = splash_image_load (max_width, max_height, be_verbose);
if (! pixbuf)
return;
splash = g_slice_new0 (GimpSplash);
splash->window =
g_object_new (GTK_TYPE_WINDOW,
"type", GTK_WINDOW_TOPLEVEL,
"type-hint", GDK_WINDOW_TYPE_HINT_SPLASHSCREEN,
"title", _("GIMP Startup"),
"role", "gimp-startup",
"screen", screen,
"window-position", GTK_WIN_POS_CENTER,
"resizable", FALSE,
NULL);
g_signal_connect_swapped (splash->window, "delete-event",
G_CALLBACK (exit),
GINT_TO_POINTER (0));
splash->width = MIN (gdk_pixbuf_animation_get_width (pixbuf),
gdk_screen_get_width (screen));
splash->height = MIN (gdk_pixbuf_animation_get_height (pixbuf),
gdk_screen_get_height (screen));
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (splash->window), frame);
gtk_widget_show (frame);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox);
gtk_widget_show (vbox);
splash->area = gtk_image_new_from_animation (pixbuf);
gtk_box_pack_start (GTK_BOX (vbox), splash->area, TRUE, TRUE, 0);
gtk_widget_show (splash->area);
gtk_widget_set_size_request (splash->area, splash->width, splash->height);
/* create the pango layouts */
splash->upper = gtk_widget_create_pango_layout (splash->area,
MEASURE_UPPER);
pango_layout_get_pixel_extents (splash->upper, &ink, NULL);
if (splash->width > 4 * ink.width)
gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_X_LARGE);
else if (splash->width > 3 * ink.width)
gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_LARGE);
else if (splash->width > 2 * ink.width)
gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_MEDIUM);
else
gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_MEDIUM);
splash->lower = gtk_widget_create_pango_layout (splash->area,
MEASURE_LOWER);
pango_layout_get_pixel_extents (splash->lower, &ink, NULL);
if (splash->width > 4 * ink.width)
gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_LARGE);
else if (splash->width > 3 * ink.width)
gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_MEDIUM);
else if (splash->width > 2 * ink.width)
gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_SMALL);
else
gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_X_SMALL);
/* this sets the initial layout positions */
splash_position_layouts (splash, "", "", NULL);
splash_average_text_area (splash,
gdk_pixbuf_animation_get_static_image (pixbuf),
&splash->color);
g_object_unref (pixbuf);
g_signal_connect_after (splash->area, "expose-event",
G_CALLBACK (splash_area_expose),
splash);
/* add a progress bar */
splash->progress = gtk_progress_bar_new ();
gtk_box_pack_end (GTK_BOX (vbox), splash->progress, FALSE, FALSE, 0);
gtk_widget_show (splash->progress);
gtk_widget_show (splash->window);
if (FALSE)
splash->timer = g_timer_new ();
}
void
splash_destroy (void)
{
if (! splash)
return;
gtk_widget_destroy (splash->window);
g_object_unref (splash->upper);
g_object_unref (splash->lower);
g_free (splash->text1);
g_free (splash->text2);
if (splash->timer)
g_timer_destroy (splash->timer);
g_slice_free (GimpSplash, splash);
splash = NULL;
}
void
splash_update (const gchar *text1,
const gchar *text2,
gdouble percentage)
{
static GdkRectangle prev_expose = { 0, 0, 0, 0 };
GdkRectangle expose = { 0, 0, 0, 0 };
g_return_if_fail (percentage >= 0.0 && percentage <= 1.0);
if (! splash)
return;
splash_position_layouts (splash, text1, text2, &expose);
gdk_rectangle_union (&expose, &prev_expose, &expose);
if (expose.width > 0 && expose.height > 0)
gtk_widget_queue_draw_area (splash->area,
expose.x, expose.y,
expose.width, expose.height);
prev_expose = expose;
if ((text1 == NULL || ! g_strcmp0 (text1, splash->text1)) &&
(text2 == NULL || ! g_strcmp0 (text2, splash->text2)) &&
percentage == splash->percentage)
{
if (text1)
{
g_free (splash->text1);
splash->text1 = g_strdup (text1);
}
if (text2)
{
g_free (splash->text2);
splash->text2 = g_strdup (text2);
}
gtk_progress_bar_pulse (GTK_PROGRESS_BAR (splash->progress));
}
else
{
gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (splash->progress),
percentage);
}
splash->percentage = percentage;
if (splash->timer)
splash_timer_elapsed ();
if (gtk_events_pending ())
gtk_main_iteration ();
}
/* private functions */
static gboolean
splash_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpSplash *splash)
{
cairo_t *cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
gdk_cairo_set_source_color (cr, &splash->color);
cairo_move_to (cr, splash->upper_x, splash->upper_y);
pango_cairo_show_layout (cr, splash->upper);
cairo_move_to (cr, splash->lower_x, splash->lower_y);
pango_cairo_show_layout (cr, splash->lower);
cairo_destroy (cr);
return FALSE;
}
/* 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 upper_ink;
PangoRectangle lower_ink;
gint text_height = 0;
if (text1)
{
pango_layout_get_pixel_extents (splash->upper, &upper_ink, NULL);
if (area)
splash_rectangle_union (area, &upper_ink,
splash->upper_x, splash->upper_y);
pango_layout_set_text (splash->upper, text1, -1);
pango_layout_get_pixel_extents (splash->upper,
&upper_ink, NULL);
splash->upper_x = (splash->width - upper_ink.width) / 2;
text_height += upper_ink.height;
}
if (text2)
{
pango_layout_get_pixel_extents (splash->lower, &lower_ink, NULL);
if (area)
splash_rectangle_union (area, &lower_ink,
splash->lower_x, splash->lower_y);
pango_layout_set_text (splash->lower, text2, -1);
pango_layout_get_pixel_extents (splash->lower,
&lower_ink, NULL);
splash->lower_x = (splash->width - lower_ink.width) / 2;
text_height += lower_ink.height;
}
/* For pretty printing, let's say we want at least double space. */
text_height *= 2;
/* The ordinates are computed in 2 steps, because we are first
* checking the minimal height needed for text (text_height).
*
* Ideally we are printing in the bottom quarter of the splash image,
* with well centered positions. But if this zone appears to be too
* small, we will end up using this previously computed text_height
* instead. Since splash images are designed to have text in the lower
* quarter, this may end up a bit uglier, but at least top and bottom
* texts won't overlay each other.
*/
if (text1)
{
splash->upper_y = MIN (splash->height - text_height,
splash->height * 13 / 16 -
upper_ink.height / 2);
if (area)
splash_rectangle_union (area, &upper_ink,
splash->upper_x, splash->upper_y);
}
if (text2)
{
splash->lower_y = ((splash->height + splash->upper_y) / 2 -
lower_ink.height / 2);
if (area)
splash_rectangle_union (area, &lower_ink,
splash->lower_x, splash->lower_y);
}
}
static void
splash_rectangle_union (GdkRectangle *dest,
PangoRectangle *pango_rect,
gint offset_x,
gint offset_y)
{
GdkRectangle rect;
rect.x = pango_rect->x + offset_x;
rect.y = pango_rect->y + offset_y;
rect.width = pango_rect->width;
rect.height = pango_rect->height;
if (dest->width > 0 && dest->height > 0)
gdk_rectangle_union (dest, &rect, dest);
else
*dest = rect;
}
/* This function chooses a gray value for the text color, based on
* the average luminance of the text area of the splash image.
*/
static gboolean
splash_average_text_area (GimpSplash *splash,
GdkPixbuf *pixbuf,
GdkColor *color)
{
const guchar *pixels;
gint rowstride;
gint channels;
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);
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);
splash_position_layouts (splash, MEASURE_UPPER, MEASURE_LOWER, &area);
splash_position_layouts (splash, "", "", NULL);
if (gdk_rectangle_intersect (&image, &area, &area))
{
const gint count = area.width * area.height;
gint x, y;
pixels += area.x * channels;
pixels += area.y * rowstride;
for (y = 0; y < area.height; y++)
{
const guchar *src = pixels;
for (x = 0; x < area.width; x++)
{
sum[0] += src[0];
sum[1] += src[1];
sum[2] += src[2];
src += channels;
}
pixels += rowstride;
}
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 (splash->area),
color, FALSE, TRUE);
}
static GdkPixbufAnimation *
splash_image_load (gint max_width,
gint max_height,
gboolean be_verbose)
{
GdkPixbufAnimation *animation = NULL;
gchar *filename;
GFile *file;
GList *list;
/* File "gimp-splash.png" in personal configuration directory. */
filename = gimp_personal_rc_file ("gimp-splash.png");
animation = splash_image_load_from_path (filename,
max_width, max_height,
be_verbose);
g_free (filename);
if (animation)
return animation;
/* Random image under splashes/ directory in personal config dir. */
filename = gimp_personal_rc_file ("splashes");
file = g_file_new_for_path (filename);
g_free (filename);
list = NULL;
list = g_list_prepend (list, file);
animation = splash_image_pick_from_dirs (list,
max_width, max_height,
be_verbose);
g_list_free_full (list, g_object_unref);
if (animation)
return animation;
/* Release splash image. */
filename = g_build_filename (gimp_data_directory (),
"images", "gimp-splash.png", NULL);
animation = splash_image_load_from_path (filename,
max_width, max_height,
be_verbose);
g_free (filename);
if (animation)
return animation;
/* Random release image in installed splashes/ directory. */
filename = g_build_filename (gimp_data_directory (), "splashes", NULL);
file = g_file_new_for_path (filename);
g_free (filename);
list = NULL;
list = g_list_prepend (list, file);
animation = splash_image_pick_from_dirs (list,
max_width, max_height,
be_verbose);
g_list_free_full (list, g_object_unref);
return animation;
}
static GdkPixbufAnimation *
splash_image_load_from_path (const gchar *filename,
gint max_width,
gint max_height,
gboolean be_verbose)
{
GdkPixbufAnimation *animation;
GFile *file;
file = g_file_new_for_path (filename);
animation = splash_image_load_from_file (file,
max_width, max_height,
be_verbose);
g_object_unref (file);
return animation;
}
static GdkPixbufAnimation *
splash_image_load_from_file (GFile *file,
gint max_width,
gint max_height,
gboolean be_verbose)
{
GdkPixbufAnimation *animation = NULL;
GFileInfo *info;
GFileInputStream *input;
gboolean is_svg = FALSE;
if (be_verbose)
{
gchar *path;
path = g_file_get_path (file);
g_printerr ("Trying splash '%s' ... ", path);
g_free (path);
}
info = g_file_query_info (file,
G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
if (info)
{
const gchar *content_type;
content_type = g_file_info_get_content_type (info);
if (content_type)
{
gchar *mime_type;
mime_type = g_content_type_get_mime_type (content_type);
if (mime_type)
{
if (g_strcmp0 (mime_type, "image/svg+xml") == 0)
{
/* We want to treat vector images differently than
* pixel images. We only scale down bitmaps, but we
* don't try to scale them up.
* On the other hand, we can always scale down and up
* vector images so that they end up in an ideal size
* in all cases.
*/
is_svg = TRUE;
}
g_free (mime_type);
}
}
g_object_unref (info);
}
input = g_file_read (file, NULL, NULL);
if (input)
{
animation = gdk_pixbuf_animation_new_from_stream (G_INPUT_STREAM (input),
NULL, NULL);
g_object_unref (input);
}
/* FIXME Right now, we only try to scale static images.
* Animated images may end up bigger than the expected max dimensions.
*/
if (animation && gdk_pixbuf_animation_is_static_image (animation) &&
(gdk_pixbuf_animation_get_width (animation) > max_width ||
gdk_pixbuf_animation_get_height (animation) > max_height ||
is_svg))
{
GdkPixbuf *pixbuf;
input = g_file_read (file, NULL, NULL);
pixbuf = gdk_pixbuf_new_from_stream_at_scale (G_INPUT_STREAM (input),
max_width, max_height,
TRUE, NULL, NULL);
g_object_unref (input);
if (pixbuf)
{
GdkPixbufSimpleAnim *simple_anim = NULL;
simple_anim = gdk_pixbuf_simple_anim_new (gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
1.0);
if (simple_anim)
{
gdk_pixbuf_simple_anim_add_frame (simple_anim, pixbuf);
g_object_unref (animation);
animation = GDK_PIXBUF_ANIMATION (simple_anim);
}
g_object_unref (pixbuf);
}
}
if (be_verbose)
g_printerr (animation ? "OK\n" : "failed\n");
return animation;
}
static GdkPixbufAnimation *
splash_image_pick_from_dirs (GList *dirs,
gint max_width,
gint max_height,
gboolean be_verbose)
{
GdkPixbufAnimation *animation = NULL;
GList *splashes = NULL;
GList *iter;
for (iter = dirs; iter; iter = iter->next)
{
GFileEnumerator *enumerator;
enumerator = g_file_enumerate_children (iter->data,
G_FILE_ATTRIBUTE_STANDARD_NAME ","
G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
G_FILE_ATTRIBUTE_TIME_MODIFIED,
G_FILE_QUERY_INFO_NONE,
NULL, NULL);
if (enumerator)
{
GFileInfo *info;
while ((info = g_file_enumerator_next_file (enumerator, NULL, NULL)))
{
GFile *child;
child = g_file_enumerator_get_child (enumerator, info);
if (g_file_query_file_type (child,
G_FILE_QUERY_INFO_NONE,
NULL) == G_FILE_TYPE_REGULAR)
splashes = g_list_prepend (splashes, child);
else
g_object_unref (child);
g_object_unref (info);
}
g_object_unref (enumerator);
}
}
if (splashes)
{
gint32 i = g_random_int_range (0, g_list_length (splashes));
animation = splash_image_load_from_file (g_list_nth_data (splashes, i),
max_width, max_height,
be_verbose);
g_list_free_full (splashes, (GDestroyNotify) g_object_unref);
}
return animation;
}
static void
splash_timer_elapsed (void)
{
gdouble elapsed = g_timer_elapsed (splash->timer, NULL);
g_printerr ("%8g %8g - %s %g%% - %s\n",
elapsed,
elapsed - splash->last_time,
splash->text1 ? splash->text1 : "",
splash->percentage * 100.0,
splash->text2 ? splash->text2 : "");
splash->last_time = elapsed;
}
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