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/* Pango
* cairoview.c: Example program to view a UTF-8 encoding file
* using PangoCairo to render result
*
* Copyright (C) 1999,2004,2005 Red Hat, Inc.
* Copyright (C) 2001 Sun Microsystems
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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 "renderdemo.h"
#include "viewer-x.h"
#include <pango/pangocairo.h>
#include <cairo-xlib.h>
static void
render_callback (PangoLayout *layout,
int x,
int y,
gpointer data,
gboolean show_borders)
{
cairo_t *cr = (cairo_t *)data;
cairo_move_to (cr, x, y);
pango_cairo_show_layout (cr, layout);
if (show_borders)
{
PangoRectangle ink, logical;
double lw = cairo_get_line_width (cr);
pango_layout_get_extents (layout, &ink, &logical);
cairo_save (cr);
cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.75);
cairo_rectangle (cr,
(double)logical.x / PANGO_SCALE - lw / 2,
(double)logical.y / PANGO_SCALE - lw / 2,
(double)logical.width / PANGO_SCALE + lw,
(double)logical.height / PANGO_SCALE + lw);
cairo_stroke (cr);
cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 0.75);
cairo_rectangle (cr,
(double)ink.x / PANGO_SCALE - lw / 2,
(double)ink.y / PANGO_SCALE - lw / 2,
(double)ink.width / PANGO_SCALE + lw,
(double)ink.height / PANGO_SCALE + lw);
cairo_stroke (cr);
cairo_restore (cr);
}
}
static void
transform_callback (PangoContext *context,
PangoMatrix *matrix,
gpointer data)
{
cairo_t *cr = (cairo_t *)data;
cairo_matrix_t cairo_matrix;
if (matrix)
{
cairo_matrix.xx = matrix->xx;
cairo_matrix.yx = matrix->yx;
cairo_matrix.xy = matrix->xy;
cairo_matrix.yy = matrix->yy;
cairo_matrix.x0 = matrix->x0;
cairo_matrix.y0 = matrix->y0;
}
else
{
cairo_matrix_init_identity (&cairo_matrix);
}
cairo_set_matrix (cr, &cairo_matrix);
pango_context_set_matrix (context, matrix);
pango_cairo_update_context (cr, context);
}
void
do_init (Display *display,
int screen,
int dpi,
/* output */
PangoContext **context,
int *width,
int *height)
{
PangoFontMap *fontmap;
cairo_t *cr;
cairo_surface_t *surface;
fontmap = pango_cairo_font_map_get_default ();
pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap), dpi);
*context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
/* This is annoying ... we have to create a temporary surface just to
* get the extents of the text.
*/
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);
cr = cairo_create (surface);
cairo_surface_destroy (surface);
do_output (*context, NULL, transform_callback, cr, width, height, FALSE);
cairo_destroy (cr);
}
void
do_render (Display *display,
int screen,
Window window,
Pixmap pixmap,
PangoContext *context,
int width,
int height,
gboolean show_borders)
{
cairo_t *cr;
cairo_surface_t *surface;
surface = cairo_xlib_surface_create (display, pixmap,
DefaultVisual (display, screen),
width, height);
cr = cairo_create (surface);
transform_callback (context, NULL, cr);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
/* Draw the text in black */
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
do_output (context, render_callback, transform_callback, cr, NULL, NULL, show_borders);
#ifdef HAVE_CAIRO_PNG
if (opt_output && *opt_output)
{
cairo_status_t status;
status = cairo_surface_write_to_png (surface, opt_output);
if (status != CAIRO_STATUS_SUCCESS)
g_printerr ("could not save PNG to '%s'\n", opt_output);
}
#endif
cairo_surface_destroy (surface);
cairo_destroy (cr);
}
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