1/*
2 * Copyright (c) 2004 Matthijs Hollemans
3 * Copyright (c) 2008-2014 Haiku, Inc. All rights reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24
25#include "ScopeView.h"
26
27#include <Catalog.h>
28#include <Locale.h>
29#include <Synth.h>
30#include <Window.h>
31
32
33#undef B_TRANSLATION_CONTEXT
34#define B_TRANSLATION_CONTEXT "Scope View"
35
36
37//	#pragma mark - ScopeView
38
39
40ScopeView::ScopeView()
41	:
42	BView(BRect(0, 0, 180, 63), NULL, B_FOLLOW_LEFT | B_FOLLOW_TOP,
43		B_WILL_DRAW),
44	fIsPlaying(false),
45	fIsEnabled(true),
46	fHaveFile(false),
47	fIsLoading(false),
48	fIsLiveInput(false),
49	fSampleCount(Bounds().IntegerWidth()),
50	fLeftSamples(new int16[fSampleCount]),
51	fRightSamples(new int16[fSampleCount]),
52	fScopeThreadID(-1)
53{
54}
55
56
57ScopeView::~ScopeView()
58{
59	delete[] fLeftSamples;
60	delete[] fRightSamples;
61}
62
63
64void ScopeView::AttachedToWindow()
65{
66	SetViewColor(0, 0, 0);
67
68	fIsFinished = false;
69	fScopeThreadID = spawn_thread(_Thread, "ScopeThread",
70		B_NORMAL_PRIORITY, this);
71	if (fScopeThreadID > 0)
72		resume_thread(fScopeThreadID);
73}
74
75
76void
77ScopeView::DetachedFromWindow()
78{
79	if (fScopeThreadID > 0) {
80		fIsFinished = true;
81		status_t exitValue;
82		wait_for_thread(fScopeThreadID, &exitValue);
83	}
84}
85
86
87void
88ScopeView::Draw(BRect updateRect)
89{
90	super::Draw(updateRect);
91
92	if (fIsLoading)
93		DrawLoading();
94	else if (!fHaveFile && !fIsLiveInput)
95		DrawNoFile();
96	else if (!fIsEnabled)
97		DrawDisabled();
98	else if (fIsPlaying || fIsLiveInput)
99		DrawPlaying();
100	else
101		DrawStopped();
102}
103
104
105int32
106ScopeView::_Thread(void* data)
107{
108	return ((ScopeView*) data)->Thread();
109}
110
111
112int32
113ScopeView::Thread()
114{
115	// Because Pulse() was too slow, I created a thread that tells the
116	// ScopeView to repaint itself. Note that we need to call LockLooper
117	// with a timeout, otherwise we'll deadlock in DetachedFromWindow().
118
119	while (!fIsFinished) {
120		if (fIsEnabled && (fIsPlaying || fIsLiveInput)) {
121			if (LockLooperWithTimeout(50000) == B_OK) {
122				Invalidate();
123				UnlockLooper();
124			}
125		}
126		snooze(50000);
127	}
128
129	return 0;
130}
131
132
133void
134ScopeView::DrawLoading()
135{
136	DrawText(B_TRANSLATE("Loading instruments" B_UTF8_ELLIPSIS));
137}
138
139
140void
141ScopeView::DrawNoFile()
142{
143	DrawText(B_TRANSLATE("Drop MIDI file here"));
144}
145
146
147void
148ScopeView::DrawDisabled()
149{
150	SetHighColor(64, 64, 64);
151
152	StrokeLine(BPoint(0, Bounds().Height() / 2),
153		BPoint(Bounds().Width(), Bounds().Height() / 2));
154}
155
156
157void
158ScopeView::DrawStopped()
159{
160	SetHighColor(0, 130, 0);
161
162	StrokeLine(BPoint(0, Bounds().Height() / 2),
163		BPoint(Bounds().Width(), Bounds().Height() / 2));
164}
165
166
167void
168ScopeView::DrawPlaying()
169{
170	int32 width = (int32) Bounds().Width();
171	int32 height = (int32) Bounds().Height();
172
173	// Scope drawing magic based on code by Michael Pfeiffer.
174
175	int32 size = be_synth->GetAudio(fLeftSamples, fRightSamples, fSampleCount);
176	if (size > 0) {
177		SetHighColor(255, 0, 130);
178		SetLowColor(0, 130, 0);
179
180		int32 x;
181		int32 y;
182		int32 sx = 0;
183		int32 f = (height << 16) / 65535;
184		int32 dy = height / 2 + 1;
185		for (int32 i = 0; i < width; i++) {
186			x = sx / width;
187			y = ((fLeftSamples[x] * f) >> 16) + dy;
188			FillRect(BRect(i, y, i, y));
189
190			y = ((fRightSamples[x] * f) >> 16) + dy;
191			FillRect(BRect(i, y, i, y), B_SOLID_LOW);
192
193			sx += size;
194		}
195	}
196}
197
198
199void
200ScopeView::DrawText(const char* text)
201{
202	font_height height;
203	GetFontHeight(&height);
204
205	float stringWidth = StringWidth(text);
206	float stringHeight = height.ascent + height.descent;
207
208	float x = (Bounds().Width() - stringWidth) / 2;
209	float y = height.ascent + (Bounds().Height() - stringHeight) / 2;
210
211	SetHighColor(255, 255, 255);
212	SetLowColor(ViewColor());
213	SetDrawingMode(B_OP_OVER);
214
215	DrawString(text, BPoint(x, y));
216}
217