gimp/plug-ins/print/print-draw-page.c

223 lines
6.9 KiB
C

/* 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 <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "print.h"
#include "print-draw-page.h"
#include "libgimp/stdplugins-intl.h"
static cairo_surface_t * print_surface_from_drawable (GimpDrawable *drawable,
GError **error);
static void print_draw_crop_marks (GtkPrintContext *context,
gdouble x,
gdouble y,
gdouble w,
gdouble h);
gboolean
print_draw_page (GtkPrintContext *context,
PrintData *data,
GError **error)
{
cairo_t *cr = gtk_print_context_get_cairo_context (context);
cairo_surface_t *surface;
surface = print_surface_from_drawable (data->drawable, error);
if (surface)
{
gint width;
gint height;
gdouble scale_x;
gdouble scale_y;
/* create a white rectangle covering the entire page, just
* to be safe; see bug #777233.
*/
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
cairo_paint (cr);
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
scale_x = gtk_print_context_get_dpi_x (context) / data->xres;
scale_y = gtk_print_context_get_dpi_y (context) / data->yres;
cairo_translate (cr,
data->offset_x / 72.0 * gtk_print_context_get_dpi_x (context),
data->offset_y / 72.0 * gtk_print_context_get_dpi_y (context));
if (data->draw_crop_marks)
print_draw_crop_marks (context,
0, 0, width * scale_x, height * scale_y);
cairo_scale (cr, scale_x, scale_y);
cairo_rectangle (cr, 0, 0, width, height);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_fill (cr);
cairo_surface_destroy (surface);
return TRUE;
}
return FALSE;
}
static cairo_surface_t *
print_surface_from_drawable (GimpDrawable *drawable,
GError **error)
{
GeglBuffer *buffer = gimp_drawable_get_buffer (drawable);
const Babl *format;
cairo_surface_t *surface;
cairo_status_t status;
const gint width = gimp_drawable_get_width (drawable);
const gint height = gimp_drawable_get_height (drawable);
GeglBufferIterator *iter;
guchar *pixels;
gint stride;
guint count = 0;
guint64 done = 0;
if (gimp_drawable_has_alpha (drawable))
format = babl_format ("cairo-ARGB32");
else
format = babl_format ("cairo-RGB24");
surface = cairo_image_surface_create (gimp_drawable_has_alpha (drawable) ?
CAIRO_FORMAT_ARGB32 :
CAIRO_FORMAT_RGB24,
width, height);
status = cairo_surface_status (surface);
if (status != CAIRO_STATUS_SUCCESS)
{
switch (status)
{
case CAIRO_STATUS_INVALID_SIZE:
g_set_error_literal (error,
GIMP_PLUGIN_PRINT_ERROR,
GIMP_PLUGIN_PRINT_ERROR_FAILED,
_("Cannot handle the size (either width or height) of the image."));
break;
default:
g_set_error (error,
GIMP_PLUGIN_PRINT_ERROR,
GIMP_PLUGIN_PRINT_ERROR_FAILED,
"Cairo error: %s",
cairo_status_to_string (status));
break;
}
return NULL;
}
pixels = cairo_image_surface_get_data (surface);
stride = cairo_image_surface_get_stride (surface);
iter = gegl_buffer_iterator_new (buffer,
GEGL_RECTANGLE (0, 0, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
while (gegl_buffer_iterator_next (iter))
{
const guchar *src = iter->items[0].data;
guchar *dest = pixels + (guint64) iter->items[0].roi.y * stride + iter->items[0].roi.x * 4;
gint y;
for (y = 0; y < iter->items[0].roi.height; y++)
{
memcpy (dest, src, iter->items[0].roi.width * 4);
src += iter->items[0].roi.width * 4;
dest += stride;
}
done += (guint64) iter->items[0].roi.height * iter->items[0].roi.width;
if (count++ % 16 == 0)
gimp_progress_update ((gdouble) done / ((gdouble) width * height));
}
g_object_unref (buffer);
cairo_surface_mark_dirty (surface);
gimp_progress_update (1.0);
return surface;
}
static void
print_draw_crop_marks (GtkPrintContext *context,
gdouble x,
gdouble y,
gdouble w,
gdouble h)
{
cairo_t *cr = gtk_print_context_get_cairo_context (context);
gdouble len = MIN (gtk_print_context_get_width (context),
gtk_print_context_get_height (context)) / 20.0;
/* upper left */
cairo_move_to (cr, x - len, y);
cairo_line_to (cr, x - len / 5, y);
cairo_move_to (cr, x, y - len);
cairo_line_to (cr, x, y - len / 5);
/* upper right */
cairo_move_to (cr, x + w + len / 5, y);
cairo_line_to (cr, x + w + len, y);
cairo_move_to (cr, x + w, y - len);
cairo_line_to (cr, x + w, y - len / 5);
/* lower left */
cairo_move_to (cr, x - len, y + h);
cairo_line_to (cr, x - len / 5, y + h);
cairo_move_to (cr, x, y + h + len);
cairo_line_to (cr, x, y + h + len / 5);
/* lower right */
cairo_move_to (cr, x + w + len / 5, y + h);
cairo_line_to (cr, x + w + len, y + h);
cairo_move_to (cr, x + w, y + h + len);
cairo_line_to (cr, x + w, y + h + len / 5);
cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
cairo_set_line_width (cr, 2);
cairo_stroke (cr);
}