git.cworth.org Git - scherzo/blob - score.h

   1 /* scherzo - Music notation training
   2  *
   3  *      score - Utilities for drawing (simple) musical scores
   4  *
   5  * Copyright © 2010 Carl Worth
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see http://www.gnu.org/licenses/ .
  19  */
  20
  21 #ifndef SCORE_H
  22 #define SCORE_H
  23
  24 #include <talloc.h>
  25 #include <cairo.h>
  26
  27 typedef struct score score_t;
  28 typedef struct score_staff score_staff_t;
  29
  30 #define SCORE_PITCH_ACCIDENTAL_MASK 0x07
  31 #define SCORE_PITCH_ACCIDENTAL_SHIFT 0
  32
  33 typedef enum score_pitch_accidental
  34 {
  35     SCORE_PITCH_ACCIDENTAL_DOUBLE_FLAT,
  36     SCORE_PITCH_ACCIDENTAL_FLAT,
  37     SCORE_PITCH_ACCIDENTAL_NATURAL,
  38     SCORE_PITCH_ACCIDENTAL_SHARP,
  39     SCORE_PITCH_ACCIDENTAL_DOUBLE_SHARP
  40 } score_pitch_accidental_t;
  41
  42 #define SCORE_PITCH_ACCIDENTAL(pitch) (((pitch) & SCORE_PITCH_ACCIDENTAL_MASK) >> SCORE_PITCH_ACCIDENTAL_SHIFT)
  43
  44 #define SCORE_PITCH_NAME_MASK 0x38
  45 #define SCORE_PITCH_NAME_SHIFT 3
  46
  47 typedef enum score_pitch_name
  48 {
  49     SCORE_PITCH_NAME_C,
  50     SCORE_PITCH_NAME_D,
  51     SCORE_PITCH_NAME_E,
  52     SCORE_PITCH_NAME_F,
  53     SCORE_PITCH_NAME_G,
  54     SCORE_PITCH_NAME_A,
  55     SCORE_PITCH_NAME_B,
  56 } score_pitch_name_t;
  57
  58 #define SCORE_PITCH_NAME(pitch) (((pitch) & SCORE_PITCH_NAME_MASK) >> SCORE_PITCH_NAME_SHIFT)
  59
  60 #define SCORE_PITCH_VALUE(name, accidental) ((SCORE_PITCH_NAME_##name << SCORE_PITCH_NAME_SHIFT) + (SCORE_PITCH_ACCIDENTAL_##accidental))
  61
  62 typedef enum score_pitch
  63 {
  64     SCORE_PITCH_Cff = SCORE_PITCH_VALUE (C, DOUBLE_FLAT),
  65     SCORE_PITCH_Cf  = SCORE_PITCH_VALUE (C, FLAT),
  66     SCORE_PITCH_C   = SCORE_PITCH_VALUE (C, NATURAL),
  67     SCORE_PITCH_Cs  = SCORE_PITCH_VALUE (C, SHARP),
  68     SCORE_PITCH_Css = SCORE_PITCH_VALUE (C, DOUBLE_SHARP),
  69
  70     SCORE_PITCH_Dff = SCORE_PITCH_VALUE (D, DOUBLE_FLAT),
  71     SCORE_PITCH_Df  = SCORE_PITCH_VALUE (D, FLAT),
  72     SCORE_PITCH_D   = SCORE_PITCH_VALUE (D, NATURAL),
  73     SCORE_PITCH_Ds  = SCORE_PITCH_VALUE (D, SHARP),
  74     SCORE_PITCH_Dss = SCORE_PITCH_VALUE (D, DOUBLE_SHARP),
  75
  76     SCORE_PITCH_Eff = SCORE_PITCH_VALUE (E, DOUBLE_FLAT),
  77     SCORE_PITCH_Ef  = SCORE_PITCH_VALUE (E, FLAT),
  78     SCORE_PITCH_E   = SCORE_PITCH_VALUE (E, NATURAL),
  79     SCORE_PITCH_Es  = SCORE_PITCH_VALUE (E, SHARP),
  80     SCORE_PITCH_Ess = SCORE_PITCH_VALUE (E, DOUBLE_SHARP),
  81
  82     SCORE_PITCH_Fff = SCORE_PITCH_VALUE (F, DOUBLE_FLAT),
  83     SCORE_PITCH_Ff  = SCORE_PITCH_VALUE (F, FLAT),
  84     SCORE_PITCH_F   = SCORE_PITCH_VALUE (F, NATURAL),
  85     SCORE_PITCH_Fs  = SCORE_PITCH_VALUE (F, SHARP),
  86     SCORE_PITCH_Fss = SCORE_PITCH_VALUE (F, DOUBLE_SHARP),
  87
  88     SCORE_PITCH_Gff = SCORE_PITCH_VALUE (G, DOUBLE_FLAT),
  89     SCORE_PITCH_Gf  = SCORE_PITCH_VALUE (G, FLAT),
  90     SCORE_PITCH_G   = SCORE_PITCH_VALUE (G, NATURAL),
  91     SCORE_PITCH_Gs  = SCORE_PITCH_VALUE (G, SHARP),
  92     SCORE_PITCH_Gss = SCORE_PITCH_VALUE (G, DOUBLE_SHARP),
  93
  94     SCORE_PITCH_Aff = SCORE_PITCH_VALUE (A, DOUBLE_FLAT),
  95     SCORE_PITCH_Af  = SCORE_PITCH_VALUE (A, FLAT),
  96     SCORE_PITCH_A   = SCORE_PITCH_VALUE (A, NATURAL),
  97     SCORE_PITCH_As  = SCORE_PITCH_VALUE (A, SHARP),
  98     SCORE_PITCH_Ass = SCORE_PITCH_VALUE (A, DOUBLE_SHARP),
  99
 100     SCORE_PITCH_Bff = SCORE_PITCH_VALUE (B, DOUBLE_FLAT),
 101     SCORE_PITCH_Bf  = SCORE_PITCH_VALUE (B, FLAT),
 102     SCORE_PITCH_B   = SCORE_PITCH_VALUE (B, NATURAL),
 103     SCORE_PITCH_Bs  = SCORE_PITCH_VALUE (B, SHARP),
 104     SCORE_PITCH_Bss = SCORE_PITCH_VALUE (B, DOUBLE_SHARP)
 105 } score_pitch_t;
 106
 107 typedef enum score_duration
 108 {
 109     SCORE_DURATION_WHOLE = 1,
 110     SCORE_DURATION_1 = 1,
 111     SCORE_DURATION_HALF = 2,
 112     SCORE_DURATION_2 = 2,
 113     SCORE_DURATION_QUARTER = 4,
 114     SCORE_DURATION_4 = 4,
 115     SCORE_DURATION_EIGHTH = 8,
 116     SCORE_DURATION_8 = 8,
 117     SCORE_DURATION_SIXTEENTH = 16,
 118     SCORE_DURATION_16 = 16,
 119     SCORE_DURATION_THIRTYSECOND = 32,
 120     SCORE_DURATION_32 = 32,
 121     SCORE_DURATION_SIXTYFOURTH = 64,
 122     SCORE_DURATION_64 = 64,
 123     SCORE_DURATION_ONEHUNDREDTWENTYEIGHTH = 128,
 124     SCORE_DURATION_128 = 128
 125 } score_duration_t;
 126
 127 #define SCORE_BUILD_NOTE(pitch, octave, duration) SCORE_PITCH_##pitch, (octave), SCORE_DURATION_##duration
 128
 129 typedef struct score_note
 130 {
 131     score_staff_t *staff;
 132     score_pitch_t pitch;
 133     int octave;
 134     score_duration_t duration;
 135
 136     struct {
 137         double r;
 138         double g;
 139         double b;
 140     } color;
 141 } score_note_t;
 142
 143 typedef struct score_chord
 144 {
 145     score_staff_t *staff;
 146
 147     char *name;
 148     double width;
 149 } score_chord_t;
 150
 151 typedef enum score_clef
 152 {
 153     SCORE_CLEF_G,
 154     SCORE_CLEF_TREBLE = SCORE_CLEF_G,
 155     SCORE_CLEF_F,
 156     SCORE_CLEF_BASS = SCORE_CLEF_F
 157 } score_clef_t;
 158
 159 /* Allocate a new, empty score object, (with optional ctx as talloc
 160  * owner). If ctx is NULL, the caller should call talloc_free on the
 161  * score_t* when done with it. Otherwise, the object will be freed
 162  * when ctx is freed. */
 163 score_t *
 164 score_create (void *ctx);
 165
 166 /* Set an (approximate) staff height. The actual staff height may
 167  * differ due to rounding to achieve evenly spaced, sharply rendered
 168  * lines. the actual staff height is returned. */
 169 int
 170 score_set_staff_height (score_t *score, int height);
 171
 172 /* Set the total width available for drawing the score. */
 173 void
 174 score_set_width (score_t *score, int width);
 175
 176 /* Add a brace to the score, connecting the given number of staves.
 177  *
 178  * The staves to be connected are those that will next be added to the
 179  * score. */
 180 void
 181 score_add_brace (score_t *score, int staves);
 182
 183 /* Add a new staff to the score */
 184 score_staff_t *
 185 score_add_staff (score_t *score, score_clef_t clef);
 186
 187 /* Add a note to a staff of the given pitch, octave, and duration.
 188  *
 189  * Octave numbers are ISO octave numbers [0:8], (so Octave 4 is from
 190  * middle C to the B above middle C).
 191  *
 192  * Duration values can be symbolic (SCORE_DURATION_WHOLE, _QUARTER,
 193  * _EIGHTH, etc.) or numerical as simply the denominator (WHOLE=1,
 194  * QUARTER=4, EIGHTH=8, etc.)
 195  */
 196 score_note_t *
 197 score_add_note (score_staff_t *staff,
 198                 score_pitch_t pitch,
 199                 int octave,
 200                 score_duration_t);
 201
 202 /* Add a chord symbol of 'name' to a staff.
 203  *
 204  * For now, the chord symbols are free-form names.
 205  */
 206 score_chord_t *
 207 score_add_chord (score_staff_t *staff,
 208                  const char * name);
 209
 210 /* Remove the given chord from its staff. */
 211 void
 212 score_remove_chord (score_chord_t *chord);
 213
 214 /* Remove the given note from its staff. */
 215 void
 216 score_remove_note (score_note_t *note);
 217
 218 void
 219 score_set_note_color_rgb (score_note_t *note,
 220                           double r,
 221                           double g,
 222                           double b);
 223
 224 /* Return the first note on the given staff with the given pitch,
 225  * octave, and durations. Returns NULL if no match is found. */
 226 score_note_t *
 227 score_staff_find_note (score_staff_t *staff,
 228                        score_pitch_t pitch,
 229                        int octave,
 230                        score_duration_t duration);
 231
 232 /* Draw the given score_t onto the given cairo_t.
 233  *
 234  * The caller can call cairo_translate before calling score_draw to
 235  * position the result as desired, (and can call cairo_clip to clip it
 236  * if desired). */
 237 void
 238 score_draw (score_t *score, cairo_t *cr);
 239
 240 #endif