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

307 lines
8.2 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 <http://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 (gint32 drawable_ID);
static void print_draw_crop_marks (GtkPrintContext *context,
gdouble x,
gdouble y,
gdouble w,
gdouble h);
gboolean
print_draw_page (GtkPrintContext *context,
PrintData *data)
{
cairo_t *cr = gtk_print_context_get_cairo_context (context);
cairo_surface_t *surface;
gint width;
gint height;
gdouble scale_x;
gdouble scale_y;
surface = print_surface_from_drawable (data->drawable_id);
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, data->offset_y);
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;
}
static inline void
convert_from_rgb (const guchar *src,
guchar *dest,
gint pixels)
{
while (pixels--)
{
GIMP_CAIRO_RGB24_SET_PIXEL (dest,
src[0], src[1], src[2]);
src += 3;
dest += 4;
}
}
static inline void
convert_from_rgba (const guchar *src,
guchar *dest,
gint pixels)
{
while (pixels--)
{
GIMP_CAIRO_ARGB32_SET_PIXEL (dest,
src[0], src[1], src[2], src[3]);
src += 4;
dest += 4;
}
}
static inline void
convert_from_gray (const guchar *src,
guchar *dest,
gint pixels)
{
while (pixels--)
{
GIMP_CAIRO_RGB24_SET_PIXEL (dest,
src[0], src[0], src[0]);
src += 1;
dest += 4;
}
}
static inline void
convert_from_graya (const guchar *src,
guchar *dest,
gint pixels)
{
while (pixels--)
{
GIMP_CAIRO_ARGB32_SET_PIXEL (dest,
src[0], src[0], src[0], src[1]);
src += 2;
dest += 4;
}
}
static inline void
convert_from_indexed (const guchar *src,
guchar *dest,
gint pixels,
const guchar *cmap)
{
while (pixels--)
{
const gint i = 3 * src[0];
GIMP_CAIRO_RGB24_SET_PIXEL (dest,
cmap[i], cmap[i + 1], cmap[i + 2]);
src += 1;
dest += 4;
}
}
static inline void
convert_from_indexeda (const guchar *src,
guchar *dest,
gint pixels,
const guchar *cmap)
{
while (pixels--)
{
const gint i = 3 * src[0];
GIMP_CAIRO_ARGB32_SET_PIXEL (dest,
cmap[i], cmap[i + 1], cmap[i + 2], src[1]);
src += 2;
dest += 4;
}
}
static cairo_surface_t *
print_surface_from_drawable (gint32 drawable_ID)
{
GimpDrawable *drawable = gimp_drawable_get (drawable_ID);
GimpPixelRgn region;
GimpImageType image_type = gimp_drawable_type (drawable_ID);
cairo_surface_t *surface;
const gint width = drawable->width;
const gint height = drawable->height;
guchar cmap[3 * 256] = { 0, };
guchar *pixels;
gint stride;
guint count = 0;
guint done = 0;
gpointer pr;
if (gimp_drawable_is_indexed (drawable_ID))
{
guchar *colors;
gint num_colors;
colors = gimp_image_get_colormap (gimp_drawable_get_image (drawable_ID),
&num_colors);
memcpy (cmap, colors, 3 * num_colors);
g_free (colors);
}
surface = cairo_image_surface_create (gimp_drawable_has_alpha (drawable_ID) ?
CAIRO_FORMAT_ARGB32 :
CAIRO_FORMAT_RGB24,
width, height);
pixels = cairo_image_surface_get_data (surface);
stride = cairo_image_surface_get_stride (surface);
gimp_pixel_rgn_init (&region, drawable, 0, 0, width, height, FALSE, FALSE);
for (pr = gimp_pixel_rgns_register (1, &region);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
const guchar *src = region.data;
guchar *dest = pixels + region.y * stride + region.x * 4;
gint y;
for (y = 0; y < region.h; y++)
{
switch (image_type)
{
case GIMP_RGB_IMAGE:
convert_from_rgb (src, dest, region.w);
break;
case GIMP_RGBA_IMAGE:
convert_from_rgba (src, dest, region.w);
break;
case GIMP_GRAY_IMAGE:
convert_from_gray (src, dest, region.w);
break;
case GIMP_GRAYA_IMAGE:
convert_from_graya (src, dest, region.w);
break;
case GIMP_INDEXED_IMAGE:
convert_from_indexed (src, dest, region.w, cmap);
break;
case GIMP_INDEXEDA_IMAGE:
convert_from_indexeda (src, dest, region.w, cmap);
break;
}
src += region.rowstride;
dest += stride;
}
done += region.h * region.w;
if (count++ % 16 == 0)
gimp_progress_update ((gdouble) done / (width * height));
}
gimp_drawable_detach (drawable);
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);
}