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https://github.com/libretro/scummvm.git
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107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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/* This file isn't used directly; rather, it's included by a different file. */
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/* Note that memcpy() is assumed to be an inlineable built-in. If it isn't,
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** performance will suck... badly.
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*/
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/* Config parameters:
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** FUNCTION_NAME: Name of the blitter function
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** USE_PRIORITY: Whether to care about the priority buffer
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** BYTESPP: Bytes per pixel
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*/
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#include "common/scummsys.h"
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/* set optimisations for Win32: */
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/* g on: enable global optimizations */
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/* t on: use fast code */
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/* y on: suppress creation of frame pointers on stack */
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/* s off: disable minimize size code */
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#ifdef WIN32
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# include <memory.h>
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# ifndef SATISFY_PURIFY
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# pragma optimize( "s", off )
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# pragma optimize( "gty", on )
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# pragma intrinsic( memcpy, memset )
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# endif
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#endif
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static void FUNCTION_NAME(byte *dest, byte *src, int bytes_per_dest_line, int bytes_per_src_line,
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int xl, int yl, byte *alpha, int bytes_per_alpha_line, int bytes_per_alpha_pixel,
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unsigned int alpha_test_mask, unsigned int alpha_min
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#ifdef USE_PRIORITY
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, byte *priority_buffer, int bytes_per_priority_line, int bytes_per_priority_pixel, int priority
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#endif /* USE_PRIORITY */
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) {
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int x, y;
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int alpha_end = xl * bytes_per_alpha_pixel;
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for (y = 0; y < yl; y++) {
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int pixel_offset = 0;
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int alpha_offset = 0;
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#ifdef USE_PRIORITY
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int priority_offset = 0;
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#endif /* USE_PRIORITY */
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for (x = 0; x < alpha_end; x += bytes_per_alpha_pixel) {
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if ((alpha_test_mask & alpha[x])
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#ifdef REVERSE_ALPHA
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>=
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#else
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<
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#endif
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alpha_min)
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#ifdef USE_PRIORITY
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if (priority_buffer[priority_offset] <= priority) {
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priority_buffer[priority_offset] = priority;
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#endif /* USE_PRIORITY */
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memcpy(dest + pixel_offset, src + pixel_offset, BYTESPP);
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#ifdef USE_PRIORITY
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}
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#endif /* USE_PRIORITY */
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pixel_offset += BYTESPP;
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alpha_offset += bytes_per_alpha_pixel;
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#ifdef USE_PRIORITY
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priority_offset += bytes_per_priority_pixel;
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#endif /* USE_PRIORITY */
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}
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dest += bytes_per_dest_line;
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src += bytes_per_src_line;
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alpha += bytes_per_alpha_line;
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#ifdef USE_PRIORITY
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priority_buffer += bytes_per_priority_line;
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#endif /* USE_PRIORITY */
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}
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}
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/* reset to original optimisations for Win32: */
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/* (does not reset intrinsics) */
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#ifdef WIN32
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# pragma optimize( "", on )
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#endif
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