src/apps/midiplayer/ScopeView.cpp

   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
  40 ScopeView::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
  57 ScopeView::~ScopeView()
  58 {
  59         delete[] fLeftSamples;
  60         delete[] fRightSamples;
  61 }
  62
  63
  64 void 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
  76 void
  77 ScopeView::DetachedFromWindow()
  78 {
  79         if (fScopeThreadID > 0) {
  80                 fIsFinished = true;
  81                 status_t exitValue;
  82                 wait_for_thread(fScopeThreadID, &exitValue);
  83         }
  84 }
  85
  86
  87 void
  88 ScopeView::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
 105 int32
 106 ScopeView::_Thread(void* data)
 107 {
 108         return ((ScopeView*) data)->Thread();
 109 }
 110
 111
 112 int32
 113 ScopeView::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
 133 void
 134 ScopeView::DrawLoading()
 135 {
 136         DrawText(B_TRANSLATE("Loading instruments" B_UTF8_ELLIPSIS));
 137 }
 138
 139
 140 void
 141 ScopeView::DrawNoFile()
 142 {
 143         DrawText(B_TRANSLATE("Drop MIDI file here"));
 144 }
 145
 146
 147 void
 148 ScopeView::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
 157 void
 158 ScopeView::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
 167 void
 168 ScopeView::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
 199 void
 200 ScopeView::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 }