ffdshow 源代码分析 3：位图覆盖滤镜（设置部分Settings）

#ifndef _TBITMAPSETTINGS_H_
#define _TBITMAPSETTINGS_H_
//各个Filter预设值
#include "TfilterSettings.h"
#include "Tfont.h"
//Bitmap的配置信息
struct TbitmapSettings : TfilterSettingsVideo {
private:
    static const TfilterIDFF idffs;
protected:
    virtual const int *getResets(unsigned int pageId);
public:
    TbitmapSettings(TintStrColl *Icoll = NULL, TfilterIDFFs *filters = NULL);
    //Bitmap文件路径
	char_t flnm[MAX_PATH];
	//x,y坐标，以及坐标的模式
    int posx, posy, posmode;
    int align;
	//叠加方式
    enum {
        MODE_BLEND = 0,
        MODE_DARKEN = 1,
        MODE_LIGHTEN = 2,
        MODE_ADD = 3,
        MODE_SOFTLIGHT = 4,
        MODE_EXCLUSION = 5
    };
    int mode;
    static const char_t *modes[];
    int strength;
	//创建Filter
    virtual void createFilters(size_t filtersorder, Tfilters *filters, TfilterQueue &queue) const;
	//创建属性页面
    virtual void createPages(TffdshowPageDec *parent) const;
    virtual bool getTip(unsigned int pageId, char_t *buf, size_t buflen);
};

#endif

再来看看TbitmapSettings.cpp

该类包含了TbitmapSettings类中函数方法的具体实现。首先看一下构造函数TbitmapSettings()。从构造函数中可以看出，绑定了类中的变量和注册表变量，使它们形成一一对应的关系。其他的函数就不再细说了，比较简单，理解起来比较容易。

/*
 * Copyright (c) 2004-2006 Milan Cutka
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "stdafx.h"
#include "TbitmapSettings.h"
#include "TimgFilterBitmap.h"
#include "Cbitmap.h"
#include "TffdshowPageDec.h"
#include "TsubtitlesSettings.h"
//几种叠加方式
const char_t* TbitmapSettings::modes[] = {
    _l("blend"),
    _l("darken"),
    _l("lighten"),
    _l("add"),
    _l("softlight"),
    _l("exclusion"),
    NULL
};
//Filter属性
const TfilterIDFF TbitmapSettings::idffs = {
    /*name*/      _l("Bitmap overlay"),
    /*id*/        IDFF_filterBitmap,
    /*is*/        IDFF_isBitmap,
    /*order*/     IDFF_orderBitmap,
    /*show*/      IDFF_showBitmap,
    /*full*/      IDFF_fullBitmap,
    /*half*/      0,
    /*dlgId*/     IDD_BITMAP,
};
//构造函数
TbitmapSettings::TbitmapSettings(TintStrColl *Icoll, TfilterIDFFs *filters): TfilterSettingsVideo(sizeof(*this), Icoll, filters, &idffs)
{
    half = 0;
    memset(flnm, 0, sizeof(flnm));
	//绑定变量
    static const TintOptionT<TbitmapSettings> iopts[] = {
        IDFF_isBitmap       , &TbitmapSettings::is        , 0, 0, _l(""), 1,
        _l("isBitmap"), 0,
        IDFF_showBitmap     , &TbitmapSettings::show      , 0, 0, _l(""), 1,
        _l("showBitmap"), 1,
        IDFF_orderBitmap    , &TbitmapSettings::order     , 1, 1, _l(""), 1,
        _l("orderBitmap"), 0,
        IDFF_fullBitmap     , &TbitmapSettings::full      , 0, 0, _l(""), 1,
        _l("fullBitmap"), 0,
        IDFF_bitmapPosx     , &TbitmapSettings::posx      , -4096, 4096, _l(""), 1,
        _l("bitmapPosX"), 50,
        IDFF_bitmapPosy     , &TbitmapSettings::posy      , -4096, 4096, _l(""), 1,
        _l("bitmapPosY"), 50,
        IDFF_bitmapPosmode  , &TbitmapSettings::posmode   , 0, 1, _l(""), 1,
        _l("bitmapPosMode"), 0,
        IDFF_bitmapAlign    , &TbitmapSettings::align     , 0, 3, _l(""), 1,
        _l("bitmapAlign"), ALIGN_CENTER,
        IDFF_bitmapMode     , &TbitmapSettings::mode      , 0, 5, _l(""), 1,
        _l("bitmapMode"), 0,
        IDFF_bitmapStrength , &TbitmapSettings::strength  , 0, 256, _l(""), 1,
        _l("bitmapStrength"), 128,
        0
    };
    addOptions(iopts);
    static const TstrOption sopts[] = {
        IDFF_bitmapFlnm     , (TstrVal)&TbitmapSettings::flnm  , MAX_PATH, 0, _l(""), 1,
        _l("bitmapFlnm"), _l(""),
        0
    };
    addOptions(sopts);

    static const TcreateParamList1 listMode(modes);
    setParamList(IDFF_bitmapMode, &listMode);
    static const TcreateParamList1 listAlign(TsubtitlesSettings::alignments);
    setParamList(IDFF_bitmapAlign, &listAlign);
}
//创建Filter
void TbitmapSettings::createFilters(size_t filtersorder, Tfilters *filters, TfilterQueue &queue) const
{
    idffOnChange(idffs, filters, queue.temporary);
    if (is && show) {
        queueFilter<TimgFilterBitmap>(filtersorder, filters, queue);
    }
}
//创建属性页面
void TbitmapSettings::createPages(TffdshowPageDec *parent) const
{
    parent->addFilterPage<TbitmapPage>(&idffs);
}

const int* TbitmapSettings::getResets(unsigned int pageId)
{
    static const int idResets[] = {
        IDFF_bitmapPosx, IDFF_bitmapPosy, IDFF_bitmapPosmode, IDFF_bitmapAlign, IDFF_bitmapMode, IDFF_bitmapStrength,
        0
    };
    return idResets;
}

bool TbitmapSettings::getTip(unsigned int pageId, char_t *tipS, size_t len)
{
    if (flnm[0]) {
        tsnprintf_s(tipS, len, _TRUNCATE, _l("%s %s"), modes[mode], flnm);
        tipS[len - 1] = '\0';
    } else {
        tipS[0] = '\0';
    }
    return true;
}

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ffdshow 源代码分析 3：位图覆盖滤镜（设置部分Settings）

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