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evince/libdocument/ev-document-misc.c
Pablo Correa Gómez 80d7ac219d libdocument: Remove trailing whitespaces
2023-03-22 20:15:51 +00:00

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/*
* Copyright (C) 2009 Juanjo Marín <juanj.marin@juntadeandalucia.es>
* Copyright (c) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
* Copyright (C) 2000-2003 Marco Pesenti Gritti
*
* 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 2, 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <string.h>
#include <math.h>
#include <gtk/gtk.h>
#include "ev-document-misc.h"
/* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
* It is four pixels wider and taller than the source. If source_pixbuf is not
* NULL, then it will fill the return pixbuf with the contents of
* source_pixbuf.
*/
static GdkPixbuf *
create_thumbnail_frame (int width,
int height,
GdkPixbuf *source_pixbuf,
gboolean fill_bg)
{
GdkPixbuf *retval;
guchar *data;
gint rowstride;
int i;
int width_r, height_r;
if (source_pixbuf)
g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
if (source_pixbuf) {
width_r = gdk_pixbuf_get_width (source_pixbuf);
height_r = gdk_pixbuf_get_height (source_pixbuf);
} else {
width_r = width;
height_r = height;
}
/* make sure no one is passing us garbage */
g_return_val_if_fail (width_r >= 0 && height_r >= 0, NULL);
retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
TRUE, 8,
width_r + 4,
height_r + 4);
/* make it black and fill in the middle */
data = gdk_pixbuf_get_pixels (retval);
rowstride = gdk_pixbuf_get_rowstride (retval);
gdk_pixbuf_fill (retval, 0x000000ff);
if (fill_bg) {
for (i = 1; i < height_r + 1; i++)
memset (data + (rowstride * i) + 4, 0xff, width_r * 4);
}
/* copy the source pixbuf */
if (source_pixbuf)
gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
width_r,
height_r,
retval,
1, 1);
/* Add the corner */
data [(width_r + 2) * 4 + 3] = 0;
data [(width_r + 3) * 4 + 3] = 0;
data [(width_r + 2) * 4 + (rowstride * 1) + 3] = 0;
data [(width_r + 3) * 4 + (rowstride * 1) + 3] = 0;
data [(height_r + 2) * rowstride + 3] = 0;
data [(height_r + 3) * rowstride + 3] = 0;
data [(height_r + 2) * rowstride + 4 + 3] = 0;
data [(height_r + 3) * rowstride + 4 + 3] = 0;
return retval;
}
/**
* ev_document_misc_get_thumbnail_frame:
* @width: the desired width
* @height: the desired height
* @source_pixbuf: a #GdkPixbuf
*
* Returns: (transfer full): a #GdkPixbuf
*/
GdkPixbuf *
ev_document_misc_get_thumbnail_frame (int width,
int height,
GdkPixbuf *source_pixbuf)
{
return create_thumbnail_frame (width, height, source_pixbuf, TRUE);
}
/**
* ev_document_misc_get_loading_thumbnail:
* @width: the desired width
* @height: the desired height
* @inverted_colors: whether to invert colors
*
* Returns: (transfer full): a #GdkPixbuf
*/
GdkPixbuf *
ev_document_misc_get_loading_thumbnail (int width,
int height,
gboolean inverted_colors)
{
return create_thumbnail_frame (width, height, NULL, !inverted_colors);
}
static cairo_surface_t *
ev_document_misc_render_thumbnail_frame (GtkWidget *widget,
int width,
int height,
gboolean inverted_colors,
GdkPixbuf *source_pixbuf,
cairo_surface_t *source_surface)
{
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags state = gtk_widget_get_state_flags (widget);
double width_r, height_r;
double width_f, height_f;
cairo_surface_t *surface;
cairo_t *cr;
double device_scale_x = 1;
double device_scale_y = 1;
GtkBorder border = {0, };
if (source_surface) {
width_r = cairo_image_surface_get_width (source_surface);
height_r = cairo_image_surface_get_height (source_surface);
#ifdef HAVE_HIDPI_SUPPORT
cairo_surface_get_device_scale (source_surface, &device_scale_x, &device_scale_y);
#endif
} else if (source_pixbuf) {
g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
width_r = gdk_pixbuf_get_width (source_pixbuf);
height_r = gdk_pixbuf_get_height (source_pixbuf);
#ifdef HAVE_HIDPI_SUPPORT
device_scale_x = device_scale_y = gtk_widget_get_scale_factor (widget);
#endif
} else {
width_r = width;
height_r = height;
#ifdef HAVE_HIDPI_SUPPORT
device_scale_x = device_scale_y = gtk_widget_get_scale_factor (widget);
#endif
}
width_r /= device_scale_x;
height_r /= device_scale_y;
gtk_style_context_save (context);
gtk_style_context_add_class (context, "page-thumbnail");
if (inverted_colors)
gtk_style_context_add_class (context, "inverted");
gtk_style_context_get_border (context, state, &border);
width_f = width_r + border.left + border.right;
height_f = height_r + border.top + border.bottom;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
device_scale_x * width_f,
device_scale_y * height_f);
#ifdef HAVE_HIDPI_SUPPORT
cairo_surface_set_device_scale (surface, device_scale_x, device_scale_y);
#endif
cr = cairo_create (surface);
if (source_surface) {
cairo_set_source_surface (cr, source_surface, border.left, border.top);
cairo_paint (cr);
} else if (source_pixbuf) {
gdk_cairo_set_source_pixbuf (cr, source_pixbuf, border.left, border.top);
cairo_paint (cr);
} else {
gtk_render_background (context, cr, 0, 0, width_f, height_f);
}
gtk_render_frame (context, cr, 0, 0, width_f, height_f);
cairo_destroy (cr);
gtk_style_context_restore (context);
return surface;
}
/**
* ev_document_misc_render_loading_thumbnail:
* @widget: a #GtkWidget to use for style information
* @width: the desired width
* @height: the desired height
* @inverted_colors: whether to invert colors
*
* Returns: (transfer full): a #GdkPixbuf
*
* Since: 3.8
*/
GdkPixbuf *
ev_document_misc_render_loading_thumbnail (GtkWidget *widget,
int width,
int height,
gboolean inverted_colors)
{
GdkPixbuf *retval;
cairo_surface_t *surface;
surface = ev_document_misc_render_thumbnail_frame (widget, width, height, inverted_colors, NULL, NULL);
retval = gdk_pixbuf_get_from_surface (surface, 0, 0, width, height);
cairo_surface_destroy (surface);
return retval;
}
/**
* ev_document_misc_render_loading_thumbnail_surface:
* @widget: a #GtkWidget to use for style information
* @width: the desired width
* @height: the desired height
* @inverted_colors: whether to invert colors
*
* Returns: (transfer full): a #cairo_surface_t
*
* Since: 3.14
*/
cairo_surface_t *
ev_document_misc_render_loading_thumbnail_surface (GtkWidget *widget,
int width,
int height,
gboolean inverted_colors)
{
return ev_document_misc_render_thumbnail_frame (widget, width, height, inverted_colors, NULL, NULL);
}
/**
* ev_document_misc_render_thumbnail_with_frame:
* @widget: a #GtkWidget to use for style information
* @source_pixbuf: a #GdkPixbuf
*
* Returns: (transfer full): a #GdkPixbuf
*
* Since: 3.8
*/
GdkPixbuf *
ev_document_misc_render_thumbnail_with_frame (GtkWidget *widget,
GdkPixbuf *source_pixbuf)
{
GdkPixbuf *retval;
cairo_surface_t *surface;
surface = ev_document_misc_render_thumbnail_frame (widget, -1, -1, FALSE, source_pixbuf, NULL);
retval = gdk_pixbuf_get_from_surface (surface, 0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
cairo_surface_destroy (surface);
return retval;
}
/**
* ev_document_misc_render_thumbnail_surface_with_frame:
* @widget: a #GtkWidget to use for style information
* @source_surface: a #cairo_surface_t
* @width: the desired width
* @height: the desired height
*
* Returns: (transfer full): a #cairo_surface_t
*
* Since: 3.14
*/
cairo_surface_t *
ev_document_misc_render_thumbnail_surface_with_frame (GtkWidget *widget,
cairo_surface_t *source_surface,
int width,
int height)
{
return ev_document_misc_render_thumbnail_frame (widget, width, height, FALSE, NULL, source_surface);
}
void
ev_document_misc_get_page_border_size (gint page_width,
gint page_height,
GtkBorder *border)
{
g_assert (border);
border->left = 1;
border->top = 1;
if (page_width < 100) {
border->right = 2;
border->bottom = 2;
} else if (page_width < 500) {
border->right = 3;
border->bottom = 3;
} else {
border->right = 4;
border->bottom = 4;
}
}
/**
* ev_document_misc_paint_one_page:
* @cr: a #cairo_tEvannotation
* @widget a #GtkWidget
* @area: a #GdkRectangle
* @border: a #GtkBorder
* @highlight: whether to highlight the text
* @inverted_colors: whether to invert colors
*
* Deprecated: 3.10.
*/
void
ev_document_misc_paint_one_page (cairo_t *cr,
GtkWidget *widget,
GdkRectangle *area,
GtkBorder *border,
gboolean highlight,
gboolean inverted_colors)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags state = gtk_widget_get_state_flags (widget);
GdkRGBA fg, bg, shade_bg;
gtk_style_context_get_background_color (context, state, &bg);
gtk_style_context_get_color (context, state, &fg);
gtk_style_context_get_color (context, GTK_STATE_FLAG_INSENSITIVE, &shade_bg);
gdk_cairo_set_source_rgba (cr, highlight ? &fg : &shade_bg);
gdk_cairo_rectangle (cr, area);
cairo_fill (cr);
if (inverted_colors)
cairo_set_source_rgb (cr, 0, 0, 0);
else
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_rectangle (cr,
area->x + border->left,
area->y + border->top,
area->width - (border->left + border->right),
area->height - (border->top + border->bottom));
cairo_fill (cr);
gdk_cairo_set_source_rgba (cr, &bg);
cairo_rectangle (cr,
area->x,
area->y + area->height - (border->bottom - border->top),
border->bottom - border->top,
border->bottom - border->top);
cairo_fill (cr);
cairo_rectangle (cr,
area->x + area->width - (border->right - border->left),
area->y,
border->right - border->left,
border->right - border->left);
cairo_fill (cr);
G_GNUC_END_IGNORE_DEPRECATIONS
}
cairo_surface_t *
ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
{
cairo_surface_t *surface;
cairo_t *cr;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf));
cr = cairo_create (surface);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
return surface;
}
/**
* ev_document_misc_pixbuf_from_surface:
* @surface: a #cairo_surface_t
*
* Returns: (transfer full): a #GdkPixbuf
*/
GdkPixbuf *
ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
{
g_return_val_if_fail (surface, NULL);
return gdk_pixbuf_get_from_surface (surface,
0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
}
cairo_surface_t *
ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
gint dest_width,
gint dest_height,
gint dest_rotation)
{
cairo_surface_t *new_surface;
cairo_t *cr;
gint width, height;
gint new_width = dest_width;
gint new_height = dest_height;
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
if (dest_width == width &&
dest_height == height &&
dest_rotation == 0) {
return cairo_surface_reference (surface);
}
if (dest_rotation == 90 || dest_rotation == 270) {
new_width = dest_height;
new_height = dest_width;
}
new_surface = cairo_surface_create_similar (surface,
cairo_surface_get_content (surface),
new_width, new_height);
cr = cairo_create (new_surface);
switch (dest_rotation) {
case 90:
cairo_translate (cr, new_width, 0);
break;
case 180:
cairo_translate (cr, new_width, new_height);
break;
case 270:
cairo_translate (cr, 0, new_height);
break;
default:
cairo_translate (cr, 0, 0);
}
cairo_rotate (cr, dest_rotation * G_PI / 180.0);
if (dest_width != width || dest_height != height) {
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
cairo_scale (cr,
(gdouble)dest_width / width,
(gdouble)dest_height / height);
}
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
return new_surface;
}
void
ev_document_misc_invert_surface (cairo_surface_t *surface) {
cairo_t *cr;
cr = cairo_create (surface);
/* white + DIFFERENCE -> invert */
cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE);
cairo_set_source_rgb (cr, 1., 1., 1.);
cairo_paint(cr);
cairo_destroy (cr);
}
void
ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf)
{
guchar *data, *p;
guint width, height, x, y, rowstride, n_channels;
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
/* First grab a pointer to the raw pixel data. */
data = gdk_pixbuf_get_pixels (pixbuf);
/* Find the number of bytes per row (could be padded). */
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
for (x = 0; x < width; x++) {
for (y = 0; y < height; y++) {
/* Calculate pixel's offset into the data array. */
p = data + x * n_channels + y * rowstride;
/* Change the RGB values*/
p[0] = 255 - p[0];
p[1] = 255 - p[1];
p[2] = 255 - p[2];
}
}
}
/**
* ev_document_misc_get_screen_dpi:
* @screen: a #GdkScreen
*
* Returns: The DPI of @screen, or 96 if the DPI is not available
*
* Deprecated: 3.36: This uses a deprecated GDK API. Use
* ev_document_misc_get_widget_dpi() instead, which uses GDK's per-monitor
* information.
*/
gdouble
ev_document_misc_get_screen_dpi (GdkScreen *screen)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
gdouble dp, di;
/*diagonal in pixels*/
dp = hypot (gdk_screen_get_width (screen), gdk_screen_get_height (screen));
if (dp == 0)
return 96;
/*diagonal in inches*/
di = hypot (gdk_screen_get_width_mm(screen), gdk_screen_get_height_mm (screen)) / 25.4;
if (di == 0)
return 96;
return (dp / di);
G_GNUC_END_IGNORE_DEPRECATIONS
}
/**
* ev_document_misc_get_widget_dpi:
* @widget: a #GtkWidget
*
* Returns sensible guess for DPI of monitor on which given widget has been
* realized. If HiDPI display, use 192, else 96.
* Returns 96 as fallback value.
*
* Returns: DPI as gdouble
*/
gdouble
ev_document_misc_get_widget_dpi (GtkWidget *widget)
{
GdkRectangle geometry;
GdkDisplay *display;
GdkMonitor *monitor;
GdkWindow *window;
gboolean is_landscape;
display = gtk_widget_get_display (widget);
window = gtk_widget_get_window (widget);
if (window != NULL) {
monitor = gdk_display_get_monitor_at_window (display, window);
} else {
monitor = gdk_display_get_primary_monitor (display);
if (monitor == NULL)
monitor = gdk_display_get_monitor (display, 0);
}
/* The only safe assumption you can make, on Unix-like/X11 and
* Linux/Wayland, is to always set the DPI to 96, regardless of
* physical/logical resolution, because that's the only safe
* guarantee we can make.
* https://gitlab.gnome.org/GNOME/gtk/-/issues/3115#note_904622 */
if (monitor == NULL)
return 96;
gdk_monitor_get_geometry (monitor, &geometry);
is_landscape = geometry.width > geometry.height;
/* DPI is 192 if height ≥ 1080 and the orientation is not portrait,
* which is, incidentally, how GTK detects HiDPI displays and set a
* scaling factor for the logical output
* https://gitlab.gnome.org/GNOME/gtk/-/issues/3115#note_904622 */
if (is_landscape && geometry.height >= 1080)
return 192;
else
return 96;
}
/**
* ev_document_misc_format_date:
* @utime: a #GTime
*
* Returns: (transfer full): a locale specific date and time representation.
*
* Deprecated: 3.38: use ev_document_misc_format_datetime instead as GTime is
* deprecated because it is not year-2038 safe.
*/
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
gchar *
ev_document_misc_format_date (GTime utime)
{
g_autoptr (GDateTime) dt = g_date_time_new_from_unix_utc ((gint64)utime);
return ev_document_misc_format_datetime (dt);
}
G_GNUC_END_IGNORE_DEPRECATIONS
/**
* ev_document_misc_format_datetime:
* @dt: a #GDateTime
*
* Determine the preferred date and time representation for the current locale
* for @dt.
*
* Returns: (transfer full): a new allocated string or NULL in the case
* that there was an error (such as a format specifier not being supported
* in the current locale). The string should be freed with g_free().
*
* Since: 3.38
*/
gchar *
ev_document_misc_format_datetime (GDateTime *dt)
{
return g_date_time_format (dt, "%c");
}
/**
* ev_document_misc_get_pointer_position:
* @widget: a #GtkWidget
* @x: (out): the pointer's "x" position, or -1 if the position is not
* available
* @y: (out): the pointer's "y" position, or -1 if the position is not
* available
*
* Get the pointer's x and y position relative to @widget.
*/
void
ev_document_misc_get_pointer_position (GtkWidget *widget,
gint *x,
gint *y)
{
GdkSeat *seat;
GdkDevice *device_pointer;
GdkRectangle allocation;
if (x)
*x = -1;
if (y)
*y = -1;
if (!gtk_widget_get_realized (widget))
return;
seat = gdk_display_get_default_seat (gtk_widget_get_display (widget));
device_pointer = gdk_seat_get_pointer (seat);
gdk_window_get_device_position (gtk_widget_get_window (widget),
device_pointer,
x, y, NULL);
if (gtk_widget_get_has_window (widget))
return;
gtk_widget_get_allocation (widget, &allocation);
if (x)
*x -= allocation.x;
if (y)
*y -= allocation.y;
}
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