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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/scummsys.h"
namespace Sci {
/* Config parameters:
** FUNCTION_NAME: Name of the blitter function
** USE_PRIORITY: Whether to care about the priority buffer
** BYTESPP: Bytes per pixel
*/
template <int BYTESPP, bool USE_PRIORITY, bool REVERSE_ALPHA>
void _gfx_crossblit(byte *dest, byte *src, int bytes_per_dest_line, int bytes_per_src_line,
int xl, int yl, byte *alpha, int bytes_per_alpha_line, int bytes_per_alpha_pixel,
unsigned int alpha_test_mask, unsigned int alpha_min,
byte *priority_buffer, int bytes_per_priority_line, int bytes_per_priority_pixel, int priority
) {
int x, y;
int alpha_end = xl * bytes_per_alpha_pixel;
for (y = 0; y < yl; y++) {
int pixel_offset = 0;
int alpha_offset = 0;
int priority_offset = 0;
for (x = 0; x < alpha_end; x += bytes_per_alpha_pixel) {
if (((alpha_test_mask & alpha[x]) < alpha_min) ^ REVERSE_ALPHA) {
if (USE_PRIORITY) {
if (priority_buffer[priority_offset] <= priority) {
priority_buffer[priority_offset] = priority;
memcpy(dest + pixel_offset, src + pixel_offset, BYTESPP);
}
} else {
memcpy(dest + pixel_offset, src + pixel_offset, BYTESPP);
}
}
pixel_offset += BYTESPP;
alpha_offset += bytes_per_alpha_pixel;
if (USE_PRIORITY)
priority_offset += bytes_per_priority_pixel;
}
dest += bytes_per_dest_line;
src += bytes_per_src_line;
alpha += bytes_per_alpha_line;
if (USE_PRIORITY)
priority_buffer += bytes_per_priority_line;
}
}
} // End of namespace Sci
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