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create a Cairo image surface from the data returned from 

2008-02-26  Sven Neumann  <sven@gimp.org>

	* plug-ins/print/print-preview.c: create a Cairo image surface
	from the data returned from gimp_drawable_get_thumbnail() instead
	of using an intermediate GdkPixbuf. This code should eventually
	end up in libgimpui.

svn path=/trunk/; revision=24971
This commit is contained in:
Sven Neumann 2008-02-26 14:49:54 +00:00 committed by Sven Neumann
parent 79088d00ea
commit 07db25d36a
2 changed files with 146 additions and 34 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2008-02-26 Sven Neumann <sven@gimp.org>
* plug-ins/print/print-preview.c: create a Cairo image surface
from the data returned from gimp_drawable_get_thumbnail() instead
of using an intermediate GdkPixbuf. This code should eventually
end up in libgimpui.
2008-02-26 Sven Neumann <sven@gimp.org>
* docs/gimp.1.in: document the "--version --verbose" option.

173
plug-ins/print/print-preview.c
View File

@ -36,31 +36,31 @@ enum
struct _PrintPreview
{
GtkEventBox parent_instance;
GtkEventBox parent_instance;
GdkCursor *cursor;
GdkCursor *cursor;
GtkPageSetup *page;
GdkPixbuf *pixbuf;
gboolean dragging;
gboolean inside;
GtkPageSetup *page;
cairo_surface_t *thumbnail;
gboolean dragging;
gboolean inside;
GimpDrawable *drawable;
GimpDrawable *drawable;
gdouble image_offset_x;
gdouble image_offset_y;
gdouble image_offset_x_max;
gdouble image_offset_y_max;
gdouble image_width;
gdouble image_height;
gdouble image_offset_x;
gdouble image_offset_y;
gdouble image_offset_x_max;
gdouble image_offset_y_max;
gdouble image_width;
gdouble image_height;
gboolean use_full_page;
gboolean use_full_page;
/* for mouse drags */
gdouble orig_offset_x;
gdouble orig_offset_y;
gint start_x;
gint start_y;
gdouble orig_offset_x;
gdouble orig_offset_y;
gint start_x;
gint start_y;
};
struct _PrintPreviewClass
@ -106,6 +106,9 @@ static void print_preview_get_page_margins (PrintPreview *preview,
gdouble *right_margin,
gdouble *top_margin,
gdouble *bottom_margin);
static cairo_surface_t * print_preview_get_thumbnail (GimpDrawable *drawable,
gint width,
gint height);
G_DEFINE_TYPE (PrintPreview, print_preview, GTK_TYPE_EVENT_BOX)
@ -209,10 +212,10 @@ print_preview_finalize (GObject *object)
preview->drawable = NULL;
}
if (preview->pixbuf)
if (preview->thumbnail)
{
g_object_unref (preview->pixbuf);
preview->pixbuf = NULL;
cairo_surface_destroy (preview->thumbnail);
preview->thumbnail = NULL;
}
if (preview->page)
@ -283,10 +286,10 @@ print_preview_size_allocate (GtkWidget *widget,
GTK_WIDGET_CLASS (print_preview_parent_class)->size_allocate (widget,
allocation);
if (preview->pixbuf != NULL)
if (preview->thumbnail)
{
g_object_unref (preview->pixbuf);
preview->pixbuf = NULL;
cairo_surface_destroy (preview->thumbnail);
preview->thumbnail = NULL;
}
}
@ -449,29 +452,30 @@ print_preview_expose_event (GtkWidget *widget,
cairo_stroke (cr);
}
if (preview->pixbuf == NULL &&
if (preview->thumbnail == NULL &&
gimp_drawable_is_valid (preview->drawable->drawable_id))
{
preview->pixbuf =
gimp_drawable_get_thumbnail (preview->drawable->drawable_id,
MIN (widget->allocation.width, 1024),
MIN (widget->allocation.height, 1024),
GIMP_PIXBUF_KEEP_ALPHA);
preview->thumbnail =
print_preview_get_thumbnail (preview->drawable,
MIN (widget->allocation.width, 1024),
MIN (widget->allocation.height, 1024));
}
if (preview->pixbuf != NULL)
if (preview->thumbnail != NULL)
{
gdouble scale_x;
gdouble scale_y;
scale_x = preview->image_width / gdk_pixbuf_get_width (preview->pixbuf);
scale_y = preview->image_height / gdk_pixbuf_get_height (preview->pixbuf);
scale_x = (preview->image_width /
cairo_image_surface_get_width (preview->thumbnail));
scale_y = (preview->image_height /
cairo_image_surface_get_height (preview->thumbnail));
cairo_rectangle (cr, 0, 0, preview->image_width, preview->image_height);
cairo_scale (cr, scale_x * scale, scale_y * scale);
gdk_cairo_set_source_pixbuf (cr, preview->pixbuf, 0, 0);
cairo_set_source_surface (cr, preview->thumbnail, 0, 0);
cairo_fill (cr);
}
@ -722,3 +726,104 @@ print_preview_get_page_margins (PrintPreview *preview,
GTK_UNIT_POINTS);
}
}
/* This thumbnail code should eventually end up in libgimpui. */
static cairo_surface_t *
print_preview_get_thumbnail (GimpDrawable *drawable,
gint width,
gint height)
{
cairo_surface_t *surface;
cairo_format_t format;
guchar *data;
guchar *dest;
const guchar *src;
gint src_stride;
gint dest_stride;
gint y;
gint bpp;
g_return_val_if_fail (width > 0 && width <= 1024, NULL);
g_return_val_if_fail (height > 0 && height <= 1024, NULL);
data = gimp_drawable_get_thumbnail_data (drawable->drawable_id,
&width, &height, &bpp);
switch (bpp)
{
case 1:
case 3:
format = CAIRO_FORMAT_RGB24;
break;
case 2:
case 4:
format = CAIRO_FORMAT_ARGB32;
break;
default:
g_assert_not_reached ();
break;
}
surface = cairo_image_surface_create (format, width, height);
src = data;
src_stride = width * bpp;
dest = cairo_image_surface_get_data (surface);
dest_stride = cairo_image_surface_get_stride (surface);
for (y = 0; y < height; y++)
{
const guchar *s = src;
guchar *d = dest;
gint w = width;
switch (bpp)
{
case 1:
while (w--)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, s[0], s[0], s[0]);
s += 1;
d += 4;
}
break;
case 2:
while (w--)
{
GIMP_CAIRO_ARGB32_SET_PIXEL (d, s[0], s[0], s[0], s[1]);
s += 2;
d += 4;
}
break;
case 3:
while (w--)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, s[0], s[1], s[2]);
s += 3;
d += 4;
}
break;
case 4:
while (w--)
{
GIMP_CAIRO_ARGB32_SET_PIXEL (d, s[0], s[1], s[2], s[3]);
s += 4;
d += 4;
}
break;
}
src += src_stride;
dest += dest_stride;
}
g_free (data);
return surface;
}