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gimp/libgimpwidgets/gimppreviewarea.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimppreviewarea.h"
#define CHECK_COLOR(area, row, col) \
(((((area)->offset_y + (row)) & GIMP_CHECK_SIZE) ^ \
(((area)->offset_x + (col)) & GIMP_CHECK_SIZE)) ? \
(GIMP_CHECK_LIGHT * 255) : \
(GIMP_CHECK_DARK * 255))
static void gimp_preview_area_class_init (GimpPreviewAreaClass *klass);
static void gimp_preview_area_init (GimpPreviewArea *area);
static void gimp_preview_area_finalize (GObject *object);
static void gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_preview_area_expose (GtkWidget *widget,
GdkEventExpose *event);
static GtkDrawingAreaClass *parent_class = NULL;
GType
gimp_preview_area_get_type (void)
{
static GType view_type = 0;
if (! view_type)
{
static const GTypeInfo view_info =
{
sizeof (GimpPreviewAreaClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_preview_area_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPreviewArea),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_preview_area_init,
};
view_type = g_type_register_static (GTK_TYPE_DRAWING_AREA,
"GimpPreviewArea",
&view_info, 0);
}
return view_type;
}
static void
gimp_preview_area_class_init (GimpPreviewAreaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_preview_area_finalize;
widget_class->size_allocate = gimp_preview_area_size_allocate;
widget_class->expose_event = gimp_preview_area_expose;
}
static void
gimp_preview_area_init (GimpPreviewArea *area)
{
area->buf = NULL;
area->cmap = NULL;
area->offset_x = 0;
area->offset_y = 0;
area->width = 0;
area->height = 0;
area->rowstride = 0;
}
static void
gimp_preview_area_finalize (GObject *object)
{
GimpPreviewArea *area = GIMP_PREVIEW_AREA (object);
if (area->buf)
{
g_free (area->buf);
area->buf = NULL;
}
if (area->cmap)
{
g_free (area->cmap);
area->cmap = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpPreviewArea *area = GIMP_PREVIEW_AREA (widget);
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (widget->allocation.width != area->width ||
widget->allocation.height != area->height)
{
if (area->buf)
{
g_free (area->buf);
area->buf = NULL;
area->rowstride = 0;
}
area->width = widget->allocation.width;
area->height = widget->allocation.height;
}
}
static gboolean
gimp_preview_area_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpPreviewArea *area;
guchar *buf;
g_return_val_if_fail (GIMP_IS_PREVIEW_AREA (widget), FALSE);
area = GIMP_PREVIEW_AREA (widget);
if (! area->buf)
return FALSE;
buf = area->buf + event->area.x * 3 + event->area.y * area->rowstride;
gdk_draw_rgb_image_dithalign (widget->window,
widget->style->fg_gc[widget->state],
event->area.x,
event->area.y,
event->area.width,
event->area.height,
GDK_RGB_DITHER_MAX,
buf,
area->rowstride,
area->offset_x - event->area.x,
area->offset_y - event->area.y);
return FALSE;
}
/**
* gimp_preview_area_new:
*
* Return value: a new #GimpPreviewArea widget.
*
* Since GIMP 2.2
**/
GtkWidget *
gimp_preview_area_new (void)
{
return g_object_new (GIMP_TYPE_PREVIEW_AREA, NULL);
}
/**
* gimp_preview_area_draw:
* @area: a #GimpPreviewArea widget.
* @x: x offset in preview
* @y: y offset in preview
* @width: buffer width
* @height: buffer height
* @type: the #GimpImageType of @buf
* @buf: a #guchar buffer that contains the preview pixel data.
* @rowstride: rowstride of @buf
*
* Draws @buf on @area and queues a redraw on the rectangle that
* changed.
*
* Since GIMP 2.2
**/
void
gimp_preview_area_draw (GimpPreviewArea *area,
gint x,
gint y,
gint width,
gint height,
GimpImageType type,
const guchar *buf,
gint rowstride)
{
const guchar *src;
guchar *dest;
gint row;
gint col;
g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
g_return_if_fail (width > 0 && height > 0);
g_return_if_fail (buf != NULL);
g_return_if_fail (rowstride > 0);
if (x + width < 0 || x >= area->width)
return;
if (y + height < 0 || y >= area->height)
return;
if (x < 0)
{
gint bpp;
switch (type)
{
case GIMP_GRAY_IMAGE:
case GIMP_INDEXED_IMAGE:
bpp = 1;
break;
case GIMP_GRAYA_IMAGE:
case GIMP_INDEXEDA_IMAGE:
bpp = 2;
break;
case GIMP_RGB_IMAGE:
bpp = 3;
break;
case GIMP_RGBA_IMAGE:
bpp = 4;
break;
default:
g_return_if_reached ();
break;
}
buf += x * bpp;
width -= x;
x = 0;
}
if (x + width > area->width)
width = area->width - x;
if (y < 0)
{
buf += y * rowstride;
height -= y;
y = 0;
}
if (y + height > area->height)
height = area->height - y;
if (! area->buf)
{
area->rowstride = ((area->width * 3) + 3) & ~3;
area->buf = g_new (guchar, area->rowstride * area->height);
}
src = buf;
dest = area->buf + x * 3 + y * area->rowstride;
switch (type)
{
case GIMP_RGB_IMAGE:
for (row = 0; row < height; row++)
{
memcpy (dest, src, 3 * width);
src += rowstride;
dest += area->rowstride;
}
break;
case GIMP_RGBA_IMAGE:
for (row = y; row < y + height; row++)
{
const guchar *s = src;
guchar *d = dest;
for (col = x; col < x + width; col++, s += 4, d+= 3)
{
switch (s[3])
{
case 0:
d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
break;
case 255:
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
break;
default:
{
register guint alpha = s[3] + 1;
register guint check = CHECK_COLOR (area, row, col);
d[0] = ((check << 8) + (s[0] - check) * alpha) >> 8;
d[1] = ((check << 8) + (s[1] - check) * alpha) >> 8;
d[2] = ((check << 8) + (s[2] - check) * alpha) >> 8;
}
break;
}
}
src += rowstride;
dest += area->rowstride;
}
break;
case GIMP_GRAY_IMAGE:
for (row = 0; row < height; row++)
{
const guchar *s = src;
guchar *d = dest;
for (col = 0; col < width; col++, s++, d += 3)
{
d[0] = d[1] = d[2] = s[0];
}
src += rowstride;
dest += area->rowstride;
}
break;
case GIMP_GRAYA_IMAGE:
for (row = y; row < y + height; row++)
{
const guchar *s = src;
guchar *d = dest;
for (col = x; col < x + width; col++, s += 2, d+= 3)
{
switch (s[1])
{
case 0:
d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
break;
case 255:
d[0] = d[1] = d[2] = s[0];
break;
default:
{
register guint alpha = s[1] + 1;
register guint check = CHECK_COLOR (area, row, col);
d[0] = d[1] = d[2] =
((check << 8) + (s[0] - check) * alpha) >> 8;
}
break;
}
}
src += rowstride;
dest += area->rowstride;
}
break;
case GIMP_INDEXED_IMAGE:
g_return_if_fail (area->cmap != NULL);
for (row = 0; row < height; row++)
{
const guchar *s = src;
guchar *d = dest;
for (col = 0; col < width; col++, s++, d += 3)
{
const guchar *cmap = area->cmap + 3 * s[0];
d[0] = cmap[0];
d[1] = cmap[1];
d[2] = cmap[2];
}
src += rowstride;
dest += area->rowstride;
}
break;
case GIMP_INDEXEDA_IMAGE:
g_return_if_fail (area->cmap != NULL);
for (row = y; row < y + height; row++)
{
const guchar *s = src;
guchar *d = dest;
for (col = x; col < x + width; col++, s += 2, d += 3)
{
const guchar *cmap = area->cmap + 3 * s[0];
switch (s[1])
{
case 0:
d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
break;
case 255:
d[0] = cmap[0];
d[1] = cmap[1];
d[2] = cmap[2];
break;
default:
{
register guint alpha = s[3] + 1;
register guint check = CHECK_COLOR (area, row, col);
d[0] = ((check << 8) + (cmap[0] - check) * alpha) >> 8;
d[1] = ((check << 8) + (cmap[1] - check) * alpha) >> 8;
d[2] = ((check << 8) + (cmap[2] - check) * alpha) >> 8;
}
break;
}
}
src += rowstride;
dest += area->rowstride;
}
break;
}
gtk_widget_queue_draw_area (GTK_WIDGET (area), x, y, width, height);
}
/**
* gimp_preview_area_fill:
* @area: a #GimpPreviewArea widget.
* @x: x offset in preview
* @y: y offset in preview
* @width: buffer width
* @height: buffer height
* @red:
* @green:
* @blue:
*
* Fills the @area in the given color.
*
* Since GIMP 2.2
**/
void
gimp_preview_area_fill (GimpPreviewArea *area,
gint x,
gint y,
gint width,
gint height,
guchar red,
guchar green,
guchar blue)
{
guchar *dest;
gint row;
gint col;
g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
g_return_if_fail (width > 0 && height > 0);
if (x + width < 0 || x >= area->width)
return;
if (y + height < 0 || y >= area->height)
return;
if (x < 0)
{
width -= x;
x = 0;
}
if (x + width > area->width)
width = area->width - x;
if (y < 0)
{
height -= y;
y = 0;
}
if (y + height > area->height)
height = area->height - y;
if (! area->buf)
{
area->rowstride = ((area->width * 3) + 3) & ~3;
area->buf = g_new (guchar, area->rowstride * area->height);
}
dest = area->buf + x * 3 + y * area->rowstride;
for (row = 0; row < height; row++)
{
guchar *d = dest;
for (col = 0; col < width; col++, d+= 3)
{
d[0] = red;
d[1] = green;
d[2] = blue;
}
dest += area->rowstride;
}
gtk_widget_queue_draw_area (GTK_WIDGET (area), x, y, width, height);
}
/**
* gimp_preview_area_set_offsets:
* @area: a #GimpPreviewArea
* @x: horizontal offset
* @y: vertical offset
*
* Sets the offsets of the previewed area. This information is used
* when drawing the checkerboard and to determine the dither offsets.
*
* Since: GIMP 2.2
**/
void
gimp_preview_area_set_offsets (GimpPreviewArea *area,
gint x,
gint y)
{
g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
area->offset_x = x;
area->offset_y = y;
}
/**
* gimp_preview_area_set_cmap:
* @area: a #GimpPreviewArea
* @cmap: a #guchar buffer that contains the colormap
* @num_colors: the number of colors in the colormap
*
* Sets the colormap for the #GimpPreviewArea widget. You need to
* call this function before you use gimp_preview_area_draw() with
* an image type of %GIMP_INDEXED_IMAGE or %GIMP_INDEXEDA_IMAGE.
*
* Since GIMP 2.2
**/
void
gimp_preview_area_set_cmap (GimpPreviewArea *area,
const guchar *cmap,
gint num_colors)
{
g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
g_return_if_fail (cmap != NULL || num_colors == 0);
g_return_if_fail (num_colors >= 0 && num_colors <= 256);
if (num_colors > 0)
{
if (! area->cmap)
area->cmap = g_new0 (guchar, 3 * 256);
memcpy (area->cmap, cmap, 3 * num_colors);
}
else
{
g_free (area->cmap);
area->cmap = NULL;
}
}
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