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/*!
\file cairodriver/Draw_bitmap.c
\brief GRASS cairo display driver - draw bitmap
(C) 2007-2010 by Lars Ahlzen and the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
\author Lars Ahlzen <lars ahlzen.com> (original contibutor)
\author Glynn Clements
*/
#include <grass/glocale.h>
#include "cairodriver.h"
/*!
\brief Draw bitmap
\param ncols,nrows number of columns and rows
\param threshold threshold value
\param buf data buffer
*/
void Cairo_draw_bitmap(int ncols, int nrows, int threshold,
const unsigned char *buf)
{
cairo_surface_t *surf;
int stride;
unsigned char *data;
int i;
G_debug(1, "Cairo_draw_bitmap: %d %d %d", ncols, nrows, threshold);
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1,5,8)
stride = cairo_format_stride_for_width(CAIRO_FORMAT_A8, ncols);
#else
#define MULTIPLE 4
stride = (ncols + (MULTIPLE - 1)) / MULTIPLE * MULTIPLE;
#endif
data = malloc(stride * nrows);
surf = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_A8, ncols,
nrows, stride);
if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS)
G_fatal_error(_("Cairo_draw_bitmap: Failed to create source"));
for (i = 0; i < nrows; i++)
memcpy(&data[i * stride], &buf[i * ncols], ncols);
cairo_surface_mark_dirty(surf);
cairo_mask_surface(cairo, surf, cur_x, cur_y);
cairo_surface_destroy(surf);
modified = 1;
}
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