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// VirtualDub - Video processing and capture application
// Graphics support library
// Copyright (C) 1998-2009 Avery Lee
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#include <stdafx.h>
#include <vd2/system/math.h>
#include <vd2/system/cpuaccel.h>
#include <vd2/Kasumi/pixmap.h>
#include <vd2/Kasumi/pixmaputils.h>
#include <vd2/Kasumi/pixmapops.h>
void VDPixmapBltAlphaConst8(uint8 *dst, ptrdiff_t dstpitch, const uint8 *src, ptrdiff_t srcpitch, uint32 w, uint32 h, uint32 ialpha);
bool VDPixmapBltAlphaConst(const VDPixmap& dst, const VDPixmap& src, float alpha) {
if (!(alpha >= 0.0f))
alpha = 0.0f;
else if (!(alpha <= 1.0f))
alpha = 1.0f;
uint32 ialpha = VDRoundToInt32(alpha * 256.0f);
// format check
if (dst.format != src.format || !src.format)
return false;
// degenerate case check
if (!dst.w || !dst.h)
return false;
// size check
if (src.w != dst.w || src.h != dst.h)
return false;
// check for formats that are not 8bpp
switch(src.format) {
case nsVDPixmap::kPixFormat_Pal1:
case nsVDPixmap::kPixFormat_Pal2:
case nsVDPixmap::kPixFormat_Pal4:
case nsVDPixmap::kPixFormat_Pal8:
case nsVDPixmap::kPixFormat_RGB565:
case nsVDPixmap::kPixFormat_XRGB1555:
return false;
}
const VDPixmapFormatInfo& formatInfo = VDPixmapGetInfo(src.format);
const int qw = -(-dst.w >> formatInfo.qwbits);
const int qh = -(-dst.h >> formatInfo.qhbits);
const int auxw = -(-dst.w >> formatInfo.auxwbits);
const int auxh = -(-dst.h >> formatInfo.auxhbits);
switch(formatInfo.auxbufs) {
case 2:
VDPixmapBltAlphaConst8((uint8 *)dst.data3, dst.pitch3, (const uint8 *)src.data3, src.pitch3, auxw, auxh, ialpha);
case 1:
VDPixmapBltAlphaConst8((uint8 *)dst.data2, dst.pitch2, (const uint8 *)src.data2, src.pitch2, auxw, auxh, ialpha);
case 0:
VDPixmapBltAlphaConst8((uint8 *)dst.data, dst.pitch, (const uint8 *)src.data, src.pitch, formatInfo.qsize * qw, qh, ialpha);
}
return true;
}
void VDPixmapBltAlphaConst8(uint8 *dst, ptrdiff_t dstpitch, const uint8 *src, ptrdiff_t srcpitch, uint32 w, uint32 h, uint32 ialpha) {
dstpitch -= w;
srcpitch -= w;
do {
uint32 w2 = w;
do {
sint32 sc = *src;
sint32 dc = *dst;
*dst = dc + (((sc-dc)*ialpha + 128) >> 8);
++src;
++dst;
} while(--w2);
src += srcpitch;
dst += dstpitch;
} while(--h);
}
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