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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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msdn_vcb
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samples
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vc98
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textout
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txtout.c
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C/C++ Source or Header
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1997-10-05
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15KB
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533 lines
/****************************************************************************
*
* TxtOut.c
*
* TXTOUT is a sample installable compressor for AVI 1.0.
*
***************************************************************************/
/**************************************************************************
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
* PURPOSE.
*
* Copyright (C) 1992 - 1997 Microsoft Corporation. All Rights Reserved.
*
**************************************************************************/
#define INC_OLE2
#include <windows.h>
#include <windowsx.h>
#include <mmsystem.h>
#include <vfw.h>
#include <stdlib.h> // for mbstowcs
#include <memory.h> // for _fmemcpy
#include <stdarg.h> // for va_list
#include "TxtOut.h"
/*****************************************************************************
*
*
****************************************************************************/
#define MODNAME "TXTOUT"
#define FOURCC_SAMP mmioFOURCC('D','R','A','W')
#define VERSION_SAMP 0x00010000 // 1.00
extern HANDLE ghModule;
/*****************************************************************************
*
* DefaultState holds the compression options that will be used if the user
* compresses an image without configuring us at all first. In the case of
* the sample compressor, it is the pixel keep ratio.
*
****************************************************************************/
ICSTATE DefaultState = {2};
/*****************************************************************************
*
* Load() is called from the ICM_LOAD message.
*
* Tasks such as allocating global memory that is non-instance specific
* or initializing coprocessor hardware may be performed here.
*
* Our simple case needs none of this.
*
****************************************************************************/
BOOL NEAR PASCAL Load(void)
{
DPF2("Load()");
return TRUE;
}
/*****************************************************************************
*
* Free() is called from the ICM_FREE message.
*
* It should totally reverse the effects of Load() in preparation for
* the DRV being removed from memory.
*
****************************************************************************/
void NEAR PASCAL Free(void)
{
DPF2("Free()");
}
/*****************************************************************************
*
* Open() is called from the ICM_OPEN message
*
* This message will be sent for a particular compress/decompress session.
* Our code must verify that we are indeed being called as a video
* compressor and create/initialize a state structure. The ICM will
* give us back the pointer to that structure on every message dealing
* with this session.
*
****************************************************************************/
INSTINFO * NEAR PASCAL Open(
ICOPEN FAR * icinfo)
{
INSTINFO * pinst;
DPF2("Open('%4.4hs', '%4.4hs')", &icinfo->fccType, &icinfo->fccHandler);
//
// refuse to open if we are not being opened as a Video compressor
//
if (icinfo->fccType != streamtypeTEXT) {
DPF2("Open rejected: not TEXT");
return NULL;
}
pinst = (INSTINFO *)LocalAlloc(LPTR, sizeof(INSTINFO));
if (!pinst) {
icinfo->dwError = ICERR_MEMORY;
DPF2("Open rejected: no memory");
return NULL;
}
//
// init structure
//
pinst->dwFlags = icinfo->dwFlags;
pinst->nDraw = 0;
pinst->hfont = GetStockFont(ANSI_VAR_FONT);
//
// set the default state.
//
SetState(pinst, NULL, 0);
//
// return success.
//
icinfo->dwError = ICERR_OK;
DPF2("Open succeeded!");
return pinst;
}
/*****************************************************************************
*
* Close() is called on the ICM_CLOSE message.
*
* This message is the complement to ICM_OPEN and marks the end
* of a compress/decompress session. We kill any in-progress operations
* (although this shouldn't be needed) and free our instance structure.
*
****************************************************************************/
LRESULT NEAR PASCAL Close(
INSTINFO * pinst)
{
DPF2("Close()");
while (pinst->nDraw > 0)
DrawEnd(pinst);
LocalFree((HLOCAL)pinst);
return 1;
}
/*****************************************************************************
*
* QueryAbout() and About() handle the ICM_ABOUT message.
*
* QueryAbout() returns TRUE to indicate we support an about box.
* About() displays the box.
*
****************************************************************************/
BOOL NEAR PASCAL QueryAbout(
INSTINFO * pinst)
{
DPF2("QueryAbout()");
return TRUE;
}
LRESULT NEAR PASCAL About(
INSTINFO * pinst,
HWND hwnd)
{
char sztempName[50];
char sztempDesc[50];
LoadString(ghModule, IDS_NAME, sztempName, sizeof sztempName);
LoadString(ghModule, IDS_DESCRIPTION, sztempDesc, sizeof sztempDesc);
DPF2("About()");
MessageBox(hwnd, sztempDesc, sztempName, MB_OK|MB_ICONINFORMATION);
return ICERR_OK;
}
/*****************************************************************************
*
* QueryConfigure() and Configure() implement the ICM_CONFIGURE message.
*
* These functions put up a dialog that allows the user, if he so
* chooses, to modify the configuration portion of our state info.
*
****************************************************************************/
BOOL NEAR PASCAL QueryConfigure(
INSTINFO * pinst)
{
DPF2("QueryConfigure()");
return FALSE;
}
LRESULT NEAR PASCAL Configure(
INSTINFO * pinst,
HWND hwnd)
{
DPF2("Configure()");
return DialogBoxParam(ghModule,"Configure",hwnd,ConfigureDlgProc, (LONG)(UINT)pinst);
}
/*****************************************************************************
*
* GetState() implements the ICM_GETSTATE message.
*
* We copy our configuration information and return how many bytes it took.
*
****************************************************************************/
LRESULT NEAR PASCAL GetState(
INSTINFO * pinst,
LPVOID pv,
DWORD dwSize)
{
DPF2("GetState(%08lX, %ld)", pv, dwSize);
if (pv == NULL || dwSize == 0)
return sizeof(ICSTATE);
if (dwSize < sizeof(ICSTATE))
return 0;
*((ICSTATE FAR *)pv) = pinst->CurrentState;
// return number of bytes copied
return sizeof(ICSTATE);
}
/*****************************************************************************
*
* SetState() implements the ICM_SETSTATE message.
*
* The ICM is giving us configuration information saved by GetState()
* earlier.
*
****************************************************************************/
LRESULT NEAR PASCAL SetState(
INSTINFO * pinst,
LPVOID pv,
DWORD dwSize)
{
DPF2("SetState(%08lX, %ld)", pv, dwSize);
if (pv == NULL)
pinst->CurrentState = DefaultState;
else if (dwSize >= sizeof(ICSTATE))
pinst->CurrentState = *((ICSTATE FAR *)pv);
else
return 0;
// return number of bytes copied
return sizeof(ICSTATE);
}
/*****************************************************************************
*
* GetInfo() implements the ICM_GETINFO message
*
* We just fill in the structure to tell the ICM what we can do. The flags
* (none of which this sample supports) mean the following :
*
* VIDCF_QUALITY - we support the quality variable. This means we look at
* dwQuality in the ICINFO structure when compressing and
* make a concious decision to trade quality for space.
* (higher values of dwQuality mean quality is more
* important). dwQuality is set by the ICM.
*
* VIDCF_TEMPORAL - We do interframe compression. In this algorithm, not
* every frame is a "key frame"; some frames depend on
* other frames to be generated. An example of this might
* be to store frame buffer differences until the
* differences are big enough to no longer make this
* worthwhile, then storing another complete frame and
* starting over. In this case, the complete frames that
* are stored are key frames and should be flagged as
* such.
*
* VIDCF_DRAW - We will draw the decompressed image on our own. This is
* useful if the decompression is assisted by the video
* hardware.
*
****************************************************************************/
LRESULT NEAR PASCAL GetInfo(
INSTINFO * pinst,
ICINFO FAR *icinfo,
DWORD dwSize)
{
char sztempName[50];
char sztempDesc[50];
LoadString(ghModule, IDS_NAME, sztempName, sizeof sztempName);
LoadString(ghModule, IDS_DESCRIPTION, sztempDesc, sizeof sztempDesc);
DPF2("GetInfo()");
if (icinfo == NULL)
return sizeof(ICINFO);
if (dwSize < sizeof(ICINFO))
return 0;
icinfo->dwSize = sizeof(ICINFO);
icinfo->fccType = streamtypeTEXT;
icinfo->fccHandler = FOURCC_SAMP;
icinfo->dwFlags = VIDCF_DRAW;
// VIDCF_QUALITY // supports quality
// VIDCF_TEMPORAL // supports inter-frame
// VIDCF_DRAW // supports drawing
icinfo->dwVersion = VERSION_SAMP;
icinfo->dwVersionICM = ICVERSION;
mbstowcs(icinfo->szDescription, sztempDesc, sizeof sztempDesc);
mbstowcs(icinfo->szName, sztempName, sizeof sztempName);
return sizeof(ICINFO);
}
LRESULT NEAR PASCAL DrawQuery(
INSTINFO * pinst,
LPVOID FAR * lpFormat)
{
return ICERR_OK;
}
/*****************************************************************************
*
* DrawBegin() implements ICM_DRAW_BEGIN
*
* This is just like DecompressBegin() except that we also must prepare to
* actually draw the bitmap on the screen. ICDRAWBEGIN provides info specific
* to this task.
*
****************************************************************************/
LRESULT NEAR PASCAL DrawBegin(
INSTINFO * pinst,
ICDRAWBEGIN FAR *icinfo,
DWORD dwSize)
{
DPF2("DrawBegin()");
if (pinst->nDraw++ > 0)
return ICERR_OK;
//
// get ready to draw
//
pinst->db = *icinfo;
SetRect(&pinst->rc, icinfo->xDst, icinfo->yDst,
icinfo->xDst + icinfo->dxDst, icinfo->yDst + icinfo->dyDst);
return ICERR_OK;
}
/*****************************************************************************
*
* Draw implements ICM_DRAW
*
* Decompress and draw
*
****************************************************************************/
LRESULT NEAR PASCAL Draw(
INSTINFO * pinst,
ICDRAW FAR *icinfo,
DWORD dwSize)
{
HFONT hfont;
DPF2("Draw()");
if (icinfo->lpData && icinfo->cbData) {
pinst->iLen = min((int) icinfo->cbData,
(int) _fstrlen((LPSTR) icinfo->lpData));
pinst->iLen = min(pinst->iLen, BUFFER_SIZE - 1);
hmemcpy(pinst->achBuffer, icinfo->lpData, pinst->iLen);
pinst->achBuffer[pinst->iLen] = '\0';
} else if (!(icinfo->dwFlags & ICDRAW_UPDATE))
return ICERR_OK;
if (pinst->nDraw == 0)
return ICERR_ERROR;
hfont = SelectFont(pinst->db.hdc, pinst->hfont);
ExtTextOut(pinst->db.hdc,
pinst->db.xDst, pinst->db.yDst,
ETO_OPAQUE,
&pinst->rc,
(LPSTR) pinst->achBuffer,
pinst->iLen,
NULL);
SelectFont(pinst->db.hdc, hfont);
return ICERR_OK;
}
/*****************************************************************************
*
* DrawEnd() implements ICM_DRAW_END
*
* See DecompressEnd()
*
****************************************************************************/
LRESULT NEAR PASCAL DrawEnd(
INSTINFO * pinst)
{
DPF2("DrawEnd()");
if (pinst->nDraw == 0)
return ICERR_ERROR;
if (--pinst->nDraw > 0)
return ICERR_OK;
//
// but if we did we would clean up here
//
return ICERR_OK;
}
/*****************************************************************************
*
* ConfigureDlgProc() is called by Configure
*
* This is a standard dialog proc which allows the user to
* pick config options for the driver.
*
****************************************************************************/
BOOL CALLBACK ConfigureDlgProc(
HWND hdlg,
UINT msg,
WPARAM wParam,
LPARAM lParam)
{
switch (msg)
{
case WM_COMMAND:
switch LOWORD((wParam))
{
case IDOK:
EndDialog(hdlg,TRUE);
break;
case IDCANCEL:
EndDialog(hdlg,FALSE);
break;
}
break;
}
return FALSE;
}
/*****************************************************************************
*
* dprintf() is called by the DPF macro if DEBUG is defined at compile time.
*
* The messages will be send to COM1: like any debug message. To
* enable debug output, add the following to WIN.INI :
*
* [debug]
* TXTOUT=1
*
****************************************************************************/
#ifdef DEBUG
static int iDebug = -1;
void FAR cdecl dprintf(
LPSTR szFormat,
...)
{
char ach[128];
if (iDebug == -1)
iDebug = GetProfileInt("Debug", MODNAME, FALSE);
if (!iDebug)
return;
lstrcpy(ach, MODNAME ": ");
{
va_list va;
va_start(va, szFormat);
wvsprintf(ach+lstrlen(ach), szFormat, va);
va_end(va);
}
lstrcat(ach, "\r\n");
OutputDebugString(ach);
}
void FAR cdecl dprintf2(
LPSTR szFormat,
...)
{
char ach[128];
if (iDebug == -1)
iDebug = GetProfileInt("Debug", MODNAME, FALSE);
if (iDebug < 2)
return;
lstrcpy(ach, MODNAME ": ");
{
va_list va;
va_start(va, szFormat);
wvsprintf(ach+lstrlen(ach), szFormat, va);
va_end(va);
}
lstrcat(ach, "\r\n");
OutputDebugString(ach);
}
#endif