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

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/* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "print.h"
#include "print-draw-page.h"
#include "libgimp/stdplugins-intl.h"
#define EPSILON 0.0001
#define INT_MULT(a,b,t) ((t) = (a) * (b) + 0x80, ((((t) >> 8) + (t)) >> 8))
#define INT_BLEND(a,b,alpha,tmp) (INT_MULT((a) - (b), alpha, tmp) + (b))
static void convert_from_rgb (guchar *pixels,
gint width);
static void convert_from_rgba (guchar *pixels,
gint width);
#if 0
static void draw_info_header (GtkPrintContext *context,
cairo_t *cr,
PrintData *data);
#endif
gboolean
draw_page_cairo (GtkPrintContext *context,
PrintData *data)
{
GimpDrawable *drawable = gimp_drawable_get (data->drawable_id);
GimpPixelRgn region;
cairo_t *cr;
cairo_surface_t *surface;
guchar *pixels;
gdouble cr_width;
gdouble cr_height;
gdouble cr_dpi_x;
gdouble cr_dpi_y;
gint width;
gint height;
gint stride;
gint y;
gdouble scale_x;
gdouble scale_y;
width = drawable->width;
height = drawable->height;
gimp_tile_cache_ntiles (width / gimp_tile_width () + 1);
cr = gtk_print_context_get_cairo_context (context);
cr_width = gtk_print_context_get_width (context);
cr_height = gtk_print_context_get_height (context);
cr_dpi_x = gtk_print_context_get_dpi_x (context);
cr_dpi_y = gtk_print_context_get_dpi_y (context);
scale_x = cr_dpi_x / data->xres;
scale_y = cr_dpi_y / data->yres;
#if 0
/* print header if it is requested */
if (data->show_info_header)
{
draw_info_header (context, cr, data);
/* In points */
#define HEADER_HEIGHT (20 * 72.0 / 25.4)
cairo_translate (cr, 0, HEADER_HEIGHT);
cr_height -= HEADER_HEIGHT;
}
#endif
cairo_translate (cr,
data->offset_x / cr_dpi_x * 72.0,
data->offset_y / cr_dpi_y * 72.0);
cairo_scale (cr, scale_x, scale_y);
gimp_pixel_rgn_init (&region, drawable, 0, 0, width, height, FALSE, FALSE);
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
pixels = cairo_image_surface_get_data (surface);
stride = cairo_image_surface_get_stride (surface);
for (y = 0; y < height; y++, pixels += stride)
{
gimp_pixel_rgn_get_row (&region, pixels, 0, y, width);
switch (drawable->bpp)
{
case 3:
convert_from_rgb (pixels, width);
break;
case 4:
convert_from_rgba (pixels, width);
break;
}
if (y % 16 == 0)
gimp_progress_update ((gdouble) y / (gdouble) height);
}
cairo_set_source_surface (cr, surface, 0, 0);
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);
cairo_surface_destroy (surface);
gimp_progress_update (1.0);
gimp_drawable_detach (drawable);
return TRUE;
}
static void
convert_from_rgb (guchar *pixels,
gint width)
{
guint32 *cairo_data = (guint32 *) pixels;
guchar *p;
gint i;
for (i = width - 1, p = pixels + 3 * width - 1; i >= 0; i--)
{
guint32 b = *p--;
guint32 g = *p--;
guint32 r = *p--;
cairo_data[i] = 0xFF000000 | (r << 16) | (g << 8) | b;
}
}
static void
convert_from_rgba (guchar *pixels,
gint width)
{
guint32 *cairo_data = (guint32 *) pixels;
guchar *p;
gint i;
for (i = 0, p = pixels; i < width; i++)
{
guint32 r = *p++;
guint32 g = *p++;
guint32 b = *p++;
guint32 a = *p++;
if (a != 255)
{
guint32 tmp;
/* composite on a white background */
r = INT_BLEND (r, 255, a, tmp);
g = INT_BLEND (g, 255, a, tmp);
b = INT_BLEND (b, 255, a, tmp);
}
cairo_data[i] = 0xFF000000 | (r << 16) | (g << 8) | b;
}
}
#if 0
static void
draw_info_header (GtkPrintContext *context,
cairo_t *cr,
PrintData *data)
{
PangoLayout *layout;
PangoFontDescription *desc;
gdouble text_height;
gdouble text_width;
gdouble fname_text_width;
gint layout_height;
gint layout_width;
gchar date_buffer[100];
GDate *date;
const gchar *name_str;
GimpParasite *parasite;
const gchar *end_ptr;
gchar *filename;
gdouble cr_width;
cairo_save (cr);
cr_width = gtk_print_context_get_width (context);
cairo_rectangle (cr, 0, 0, cr_width, HEADER_HEIGHT);
cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
layout = gtk_print_context_create_pango_layout (context);
desc = pango_font_description_from_string ("sans 14");
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
pango_layout_set_width (layout, -1);
pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
/* image name */
pango_layout_set_text (layout, gimp_image_get_name (data->image_id), -1);
pango_layout_get_size (layout, &layout_width, &layout_height);
text_height = (gdouble) layout_height / PANGO_SCALE;
cairo_move_to (cr, 0.02 * cr_width, (HEADER_HEIGHT - text_height) / 5);
pango_cairo_show_layout (cr, layout);
/* user name */
name_str = g_get_real_name ();
if (name_str && g_utf8_validate (name_str, -1, &end_ptr))
{
pango_layout_set_text (layout, name_str, -1);
pango_layout_get_size (layout, &layout_width, &layout_height);
text_height = (gdouble) layout_height / PANGO_SCALE;
text_width = (gdouble) layout_width / PANGO_SCALE;
cairo_move_to (cr, 0.5 * cr_width - 0.5 * text_width,
(HEADER_HEIGHT - text_height) / 5);
pango_cairo_show_layout (cr, layout);
}
/* date */
date = g_date_new ();
g_date_set_time_t (date, time (NULL));
g_date_strftime (date_buffer, 100, "%x", date);
g_date_free (date);
pango_layout_set_text (layout, date_buffer, -1);
pango_layout_get_size (layout, &layout_width, &layout_height);
text_height = (gdouble) layout_height / PANGO_SCALE;
text_width = (gdouble) layout_width / PANGO_SCALE;
cairo_move_to (cr,
0.98 * cr_width - text_width,
(HEADER_HEIGHT - text_height) / 5);
pango_cairo_show_layout (cr, layout);
/* file name if any */
filename = gimp_image_get_filename (data->image_id);
if (filename)
{
pango_layout_set_text (layout,
gimp_filename_to_utf8 (filename), -1);
g_free (filename);
pango_layout_get_size (layout, &layout_width, &layout_height);
text_height = (gdouble) layout_height / PANGO_SCALE;
fname_text_width = (gdouble) layout_width / PANGO_SCALE;
cairo_move_to (cr,
0.02 * cr_width, 4 * (HEADER_HEIGHT - text_height) / 5);
pango_cairo_show_layout (cr, layout);
}
else
{
fname_text_width = 0;
}
/* image comment if it is short */
parasite = gimp_image_parasite_find (data->image_id, "gimp-comment");
if (parasite)
{
pango_layout_set_text (layout, gimp_parasite_data (parasite), -1);
pango_layout_get_size (layout, &layout_width, &layout_height);
text_height = (gdouble) layout_height / PANGO_SCALE;
text_width = (gdouble) layout_width / PANGO_SCALE;
if (fname_text_width + text_width < 0.8 * cr_width &&
text_height < 0.5 * HEADER_HEIGHT)
{
cairo_move_to (cr, 0.98 * cr_width - text_width,
4 * (HEADER_HEIGHT - text_height) / 5);
pango_cairo_show_layout (cr, layout);
}
gimp_parasite_free (parasite);
}
g_object_unref (layout);
cairo_restore (cr);
}
#endif
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