gtk2/gtk/gtkpreview.c
Owen Taylor e2a5219220 Merge from themes-2. See the ChangeLog for a somewhat detailed
history of the evolution of the changes involved. Most of this
is actually minor painting tweaks.
1998-11-06 22:05:02 +00:00

516 lines
12 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <math.h>
#include <string.h>
#include <sys/types.h>
#include <sys/param.h>
#include "gdk/gdkx.h"
#include "gdk/gdkrgb.h"
#include "gtkpreview.h"
#include "gtksignal.h"
#define PREVIEW_CLASS(w) GTK_PREVIEW_CLASS (GTK_OBJECT (w)->klass)
static void gtk_preview_class_init (GtkPreviewClass *klass);
static void gtk_preview_init (GtkPreview *preview);
static void gtk_preview_finalize (GtkObject *object);
static void gtk_preview_realize (GtkWidget *widget);
static gint gtk_preview_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_preview_make_buffer (GtkPreview *preview);
static void gtk_fill_lookup_array (guchar *array);
static GtkWidgetClass *parent_class = NULL;
static GtkPreviewClass *preview_class = NULL;
static gint install_cmap = FALSE;
guint
gtk_preview_get_type (void)
{
static guint preview_type = 0;
if (!preview_type)
{
GtkTypeInfo preview_info =
{
"GtkPreview",
sizeof (GtkPreview),
sizeof (GtkPreviewClass),
(GtkClassInitFunc) gtk_preview_class_init,
(GtkObjectInitFunc) gtk_preview_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
preview_type = gtk_type_unique (gtk_widget_get_type (), &preview_info);
}
return preview_type;
}
static void
gtk_preview_class_init (GtkPreviewClass *klass)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass*) klass;
widget_class = (GtkWidgetClass*) klass;
parent_class = gtk_type_class (gtk_widget_get_type ());
preview_class = klass;
object_class->finalize = gtk_preview_finalize;
widget_class->realize = gtk_preview_realize;
widget_class->expose_event = gtk_preview_expose;
klass->info.visual = NULL;
klass->info.cmap = NULL;
klass->info.lookup = NULL;
klass->info.gamma = 1.0;
gdk_rgb_init ();
klass->info.cmap = gdk_rgb_get_cmap ();
klass->info.visual = gdk_rgb_get_visual ();
}
void
gtk_preview_reset (void)
{
/* unimplemented */
}
static void
gtk_preview_init (GtkPreview *preview)
{
GTK_WIDGET_SET_FLAGS (preview, GTK_BASIC);
preview->buffer = NULL;
preview->buffer_width = 0;
preview->buffer_height = 0;
preview->expand = FALSE;
}
void
gtk_preview_uninit (void)
{
/* unimplemented */
}
GtkWidget*
gtk_preview_new (GtkPreviewType type)
{
GtkPreview *preview;
preview = gtk_type_new (gtk_preview_get_type ());
preview->type = type;
if (type == GTK_PREVIEW_COLOR)
preview->bpp = 3;
else
preview->bpp = 1;
preview->dither = GDK_RGB_DITHER_NORMAL;
return GTK_WIDGET (preview);
}
void
gtk_preview_size (GtkPreview *preview,
gint width,
gint height)
{
g_return_if_fail (preview != NULL);
g_return_if_fail (GTK_IS_PREVIEW (preview));
if ((width != GTK_WIDGET (preview)->requisition.width) ||
(height != GTK_WIDGET (preview)->requisition.height))
{
GTK_WIDGET (preview)->requisition.width = width;
GTK_WIDGET (preview)->requisition.height = height;
if (preview->buffer)
g_free (preview->buffer);
preview->buffer = NULL;
}
}
void
gtk_preview_put (GtkPreview *preview,
GdkWindow *window,
GdkGC *gc,
gint srcx,
gint srcy,
gint destx,
gint desty,
gint width,
gint height)
{
GtkWidget *widget;
GdkRectangle r1, r2, r3;
guchar *src;
guint bpp;
guint rowstride;
g_return_if_fail (preview != NULL);
g_return_if_fail (GTK_IS_PREVIEW (preview));
g_return_if_fail (window != NULL);
if (!preview->buffer)
return;
widget = GTK_WIDGET (preview);
r1.x = 0;
r1.y = 0;
r1.width = preview->buffer_width;
r1.height = preview->buffer_height;
r2.x = srcx;
r2.y = srcy;
r2.width = width;
r2.height = height;
if (!gdk_rectangle_intersect (&r1, &r2, &r3))
return;
bpp = preview->bpp;
rowstride = preview->rowstride;
src = preview->buffer + r3.y * rowstride + r3.x * bpp;
if (preview->type == GTK_PREVIEW_COLOR)
gdk_draw_rgb_image (window,
gc,
destx + (r3.x - srcx),
desty + (r3.y - srcy),
r3.width,
r3.height,
preview->dither,
src,
rowstride);
else
gdk_draw_gray_image (window,
gc,
destx + (r3.x - srcx),
desty + (r3.y - srcy),
r3.width,
r3.height,
preview->dither,
src,
rowstride);
}
void
gtk_preview_put_row (GtkPreview *preview,
guchar *src,
guchar *dest,
gint x,
gint y,
gint w)
{
g_warning ("gtk_preview_put_row not implemented (deprecated)\n");
}
void
gtk_preview_draw_row (GtkPreview *preview,
guchar *data,
gint x,
gint y,
gint w)
{
guint bpp;
guint rowstride;
g_return_if_fail (preview != NULL);
g_return_if_fail (GTK_IS_PREVIEW (preview));
g_return_if_fail (data != NULL);
g_return_if_fail (preview_class->info.visual != NULL);
bpp = (preview->type == GTK_PREVIEW_COLOR ? 3 : 1);
rowstride = (preview->buffer_width * bpp + 3) & -4;
if ((w <= 0) || (y < 0))
return;
g_return_if_fail (data != NULL);
gtk_preview_make_buffer (preview);
if (x + w > preview->buffer_width)
return;
if (y + 1 > preview->buffer_height)
return;
if (preview_class->info.gamma == 1.0)
memcpy (preview->buffer + y * rowstride + x * bpp, data, w * bpp);
else
{
guint i, size;
guchar *src, *dst;
guchar *lookup;
if (preview_class->info.lookup != NULL)
lookup = preview_class->info.lookup;
else
{
preview_class->info.lookup = g_new (guchar, 256);
gtk_fill_lookup_array (preview_class->info.lookup);
lookup = preview_class->info.lookup;
}
size = w * bpp;
src = data;
dst = preview->buffer + y * rowstride + x * bpp;
for (i = 0; i < size; i++)
*dst++ = lookup[*src++];
}
}
void
gtk_preview_set_expand (GtkPreview *preview,
gint expand)
{
g_return_if_fail (preview != NULL);
g_return_if_fail (GTK_IS_PREVIEW (preview));
preview->expand = (expand != FALSE);
}
void
gtk_preview_set_gamma (double _gamma)
{
if (!preview_class)
preview_class = gtk_type_class (gtk_preview_get_type ());
if (preview_class->info.gamma != _gamma)
{
preview_class->info.gamma = _gamma;
if (preview_class->info.lookup != NULL)
{
g_free (preview_class->info.lookup);
preview_class->info.lookup = NULL;
}
}
}
void
gtk_preview_set_color_cube (guint nred_shades,
guint ngreen_shades,
guint nblue_shades,
guint ngray_shades)
{
/* unimplemented */
}
void
gtk_preview_set_install_cmap (gint _install_cmap)
{
/* effectively unimplemented */
install_cmap = _install_cmap;
}
void
gtk_preview_set_reserved (gint nreserved)
{
/* unimplemented */
}
void
gtk_preview_set_dither (GtkPreview *preview,
GdkRgbDither dither)
{
preview->dither = dither;
}
GdkVisual*
gtk_preview_get_visual (void)
{
if (!preview_class)
preview_class = gtk_type_class (gtk_preview_get_type ());
return preview_class->info.visual;
}
GdkColormap*
gtk_preview_get_cmap (void)
{
if (!preview_class)
preview_class = gtk_type_class (gtk_preview_get_type ());
return preview_class->info.cmap;
}
GtkPreviewInfo*
gtk_preview_get_info (void)
{
if (!preview_class)
preview_class = gtk_type_class (gtk_preview_get_type ());
return &preview_class->info;
}
static void
gtk_preview_finalize (GtkObject *object)
{
GtkPreview *preview;
g_return_if_fail (object != NULL);
g_return_if_fail (GTK_IS_PREVIEW (object));
preview = GTK_PREVIEW (object);
if (preview->buffer)
g_free (preview->buffer);
preview->type = (GtkPreviewType) -1;
(* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}
static void
gtk_preview_realize (GtkWidget *widget)
{
GtkPreview *preview;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_PREVIEW (widget));
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
preview = GTK_PREVIEW (widget);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = preview_class->info.visual;
attributes.colormap = preview_class->info.cmap;
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
gdk_window_set_user_data (widget->window, widget);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
}
static gint
gtk_preview_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkPreview *preview;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_PREVIEW (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (GTK_WIDGET_DRAWABLE (widget))
{
preview = GTK_PREVIEW (widget);
gtk_preview_put (GTK_PREVIEW (widget),
widget->window, widget->style->black_gc,
event->area.x -
(widget->allocation.width - preview->buffer_width)/2,
event->area.y -
(widget->allocation.height - preview->buffer_height)/2,
event->area.x, event->area.y,
event->area.width, event->area.height);
}
return FALSE;
}
static void
gtk_preview_make_buffer (GtkPreview *preview)
{
GtkWidget *widget;
gint width;
gint height;
g_return_if_fail (preview != NULL);
g_return_if_fail (GTK_IS_PREVIEW (preview));
widget = GTK_WIDGET (preview);
if (preview->expand &&
(widget->allocation.width != 0) &&
(widget->allocation.height != 0))
{
width = widget->allocation.width;
height = widget->allocation.height;
}
else
{
width = widget->requisition.width;
height = widget->requisition.height;
}
if (!preview->buffer ||
(preview->buffer_width != width) ||
(preview->buffer_height != height))
{
if (preview->buffer)
g_free (preview->buffer);
preview->buffer_width = width;
preview->buffer_height = height;
preview->rowstride = (preview->buffer_width * preview->bpp + 3) & -4;
preview->buffer = g_new0 (guchar,
preview->buffer_height *
preview->rowstride);
}
}
/* This will be useful for implementing gamma. */
static void
gtk_fill_lookup_array (guchar *array)
{
double one_over_gamma;
double ind;
int val;
int i;
one_over_gamma = 1.0 / preview_class->info.gamma;
for (i = 0; i < 256; i++)
{
ind = (double) i / 255.0;
val = (int) (255 * pow (ind, one_over_gamma));
array[i] = val;
}
}