263 lines
8.2 KiB
C
263 lines
8.2 KiB
C
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/**************************************************************************
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*
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* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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* PURPOSE.
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*
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* Copyright (c) 1992 - 1995 Microsoft Corporation. All Rights Reserved.
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*
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**************************************************************************/
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/****************************************************************************
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*
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* rlmeter.c: Audio recording level window
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*
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* Vidcap32 Source code
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*
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***************************************************************************/
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/*
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* This window class acts as a 'VU Meter' showing the current and peak
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* volume. Set the volume via the WMRL_SETLEVEL message (lParam is new level).
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* The peak level will be tracked by the control by means of a 2-second timer.
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*/
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#include <windows.h>
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#include <windowsx.h>
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#include "rlmeter.h"
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#ifdef _WIN32
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#ifndef EXPORT
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#define EXPORT
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#endif
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#endif
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LRESULT FAR PASCAL EXPORT
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RLMeterProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
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/*
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* generic window class to support a volume level display.
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*
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* The window has a white background, and draws a black filled
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* rectangle to show the current volume level, and a red line at the
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* peak. Every two seconds on a timer we lower the peak (we set the
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* saved peak value to 0 so that at the next update we move the line to
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* whatever is the current level.
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*
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* We store the pen and brush handles and the current and maximum levels
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* as window words using SetWindowWord on win16 and SetWindowLong on win32.
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*/
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// window data layout
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#define WD_MAX 0 // current max
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#define WD_PREVMAX (WD_MAX + sizeof(UINT)) // currently drawn max
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#define WD_PREVLVL (WD_PREVMAX + sizeof(UINT)) // currently drawn level
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#define WD_PEN (WD_PREVLVL + sizeof(UINT)) // pen for max line
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#define WDBYTES (WD_PEN + sizeof(UINT_PTR)) // window bytes to alloc
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#ifdef _WIN32
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#define SetWindowUINT SetWindowLong
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#define GetWindowUINT GetWindowLong
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#define SetWindowUINTPtr SetWindowLongPtr
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#define GetWindowUINTPtr GetWindowLongPtr
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#else
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#define SetWindowUINT SetWindowWord
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#define GetWindowUINT GetWindowWord
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#define SetWindowUINTPtr SetWindowWord
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#define GetWindowUINTPtr GetWindowWord
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#endif
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// call (if first instance) to register class
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BOOL
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RLMeter_Register(HINSTANCE hInstance)
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{
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WNDCLASS cls;
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cls.hCursor = LoadCursor(NULL,IDC_ARROW);
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cls.hIcon = NULL;
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cls.lpszMenuName = NULL;
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cls.lpszClassName = RLMETERCLASS;
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cls.hbrBackground = GetStockObject(WHITE_BRUSH);
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cls.hInstance = hInstance;
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cls.style = CS_HREDRAW | CS_VREDRAW;
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cls.lpfnWndProc = RLMeterProc;
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cls.cbClsExtra = 0;
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cls.cbWndExtra = WDBYTES;
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return RegisterClass(&cls);
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}
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LRESULT FAR PASCAL EXPORT
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RLMeterProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch(message) {
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case WM_CREATE:
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// init current level and max to 0
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SetWindowUINT(hwnd, WD_MAX, 0);
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SetWindowUINT(hwnd, WD_PREVMAX, 0);
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SetWindowUINT(hwnd, WD_PREVLVL, 0);
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// create a red pen for the max line and store this
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SetWindowUINTPtr(hwnd, WD_PEN,
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(UINT_PTR) CreatePen(PS_SOLID, 2, RGB(255, 0, 0)));
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break;
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case WM_DESTROY:
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// destroy the pen we created
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{
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HPEN hpen = (HPEN) GetWindowUINTPtr(hwnd, WD_PEN);
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if (hpen) {
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DeleteObject(hpen);
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SetWindowUINTPtr(hwnd, WD_PEN, 0);
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}
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// also kill the timer we created
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KillTimer(hwnd, 0);
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}
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break;
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case WM_PAINT:
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/*
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* paint the entire control
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*
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* nb we must paint exactly as it is currently drawn because we
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* may be clipped to only part of the control. Thus we must draw
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* the max at WD_PREVMAX as it is currently drawn, since WD_MAX
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* may have been set to 0 and not yet drawn - in this case, with
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* some unfortunate timing and clipping, we would have two max lines.
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*/
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{
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PAINTSTRUCT ps;
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HDC hdc;
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RECT rc, rcFill;
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HPEN hpenOld, hpen;
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hdc = BeginPaint(hwnd, &ps);
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GetClientRect(hwnd, &rc);
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// treat the level as a percentage and fill that much of the
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// control with black (from left)
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rcFill = rc;
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rcFill.right = (rc.right * GetWindowUINT(hwnd, WD_PREVLVL)) / 100;
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SetBkColor(hdc, RGB(0,0,0));
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// easy way to fill without creating a brush
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ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rcFill, NULL, 0, NULL);
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// draw the max line
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rcFill.right = (rc.right * GetWindowUINT(hwnd, WD_PREVLVL)) / 100;
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hpen = (HPEN) GetWindowUINTPtr(hwnd, WD_PEN);
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hpenOld = SelectObject(hdc, hpen);
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MoveToEx(hdc, rcFill.right, rcFill.top, NULL);
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LineTo(hdc, rcFill.right, rcFill.bottom);
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SelectObject(hdc, hpenOld);
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EndPaint(hwnd, &ps);
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}
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break;
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case WMRL_SETLEVEL:
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// set new level, and update the displayed level block and max line
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{
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RECT rc, rcFill;
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UINT uMax, uPrevMax, uPrevLevel, uLevel;
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HDC hdc;
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// new level is lParam
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uLevel = (UINT) lParam;
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// fetch other parameters
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uMax = GetWindowUINT(hwnd, WD_MAX);
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uPrevMax = GetWindowUINT(hwnd, WD_PREVMAX);
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uPrevLevel = GetWindowUINT(hwnd, WD_PREVLVL);
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// decay the max level. This rate works best if we are called
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// to update every 1/20th sec - in this case the decay will be
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// 64% in a second.
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if (uMax > 0) {
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uMax = (uMax * 2007) / 2048; // = 0.98 * uMax
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}
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hdc = GetDC(hwnd);
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GetClientRect(hwnd, &rc);
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rcFill = rc;
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// is the current level a new peak ?
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if (uLevel > uMax) {
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uMax = uLevel;
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}
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SetWindowUINT(hwnd, WD_MAX, uMax);
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// if the max has moved, erase the old line
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if (uMax != uPrevMax) {
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// white out the line by filling a 2-pixel wide rect
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rcFill.right = ((rc.right * uPrevMax) / 100) + 1;
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rcFill.left = rcFill.right - 2;
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SetBkColor(hdc, RGB(255, 255, 255));
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ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rcFill, NULL, 0, NULL);
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}
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// calculate the area to update
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rcFill.right = (rc.right * uPrevLevel) / 100;
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rcFill.left = (rc.right * uLevel) / 100;
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// are we erasing (lowering level) or drawing more black?
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if (rcFill.right > rcFill.left) {
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// level has dropped - so fill with white down to new level
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SetBkColor(hdc, RGB(255, 255, 255));
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} else {
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// level has gone up so fill with black up to new level
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int t;
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t = rcFill.right;
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rcFill.right = rcFill.left;
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rcFill.left = t;
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SetBkColor(hdc, RGB(0, 0, 0));
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// fill a little extra to ensure no rounding gaps
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if (rcFill.left > 0) {
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rcFill.left -= 1;
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}
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}
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ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rcFill, NULL, 0, NULL);
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SetWindowUINT(hwnd, WD_PREVLVL, uLevel);
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// draw the new max line if needed
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if (uMax != uPrevMax) {
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HPEN hpen, hpenOld;
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rcFill.right = (rc.right * uMax) /100;
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hpen = (HPEN) GetWindowUINTPtr(hwnd, WD_PEN);
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hpenOld = SelectObject(hdc, hpen);
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MoveToEx(hdc, rcFill.right, rcFill.top, NULL);
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LineTo(hdc, rcFill.right, rcFill.bottom);
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SelectObject(hdc, hpenOld);
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SetWindowUINT(hwnd, WD_PREVMAX, uMax);
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}
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ReleaseDC(hwnd, hdc);
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return(0);
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}
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}
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return DefWindowProc(hwnd, message, wParam, lParam);
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}
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