Dear developers,
I am now more or less finished with my plugin which draws spectrograms
from audio signals.
It takes about 30 seconds to draw 750 × 1200 pixels on my 3Ghz.
Is that slow or fast?
The code that does the drawing is this one:
gboolean s;
guint8 pixel[] = { 0x00 };
double d;
for (int n = 0; n < data->width; n++) {
for (int m = 0; m < data->height; m++) {
/* make coef_db start from zero */
d = (data->coef_db)[m+n*data->M] + data->coef_db_min;
/* quantize so values are from 0 to 255 */
/* The absolut value of min is added to max */
pixel[0] = quantize(d, fabs(data->coef_db_min) + data->coef_db_max);
/* set the pixel */
/* coef_db have x=0,y=0 at buttom left corner and gimp have 0,0
at top left corner */
s = gimp_drawable_set_pixel(data->layer, n, data->height - m, 1,
(guint8 *)pixel );
}
}
data->display = gimp_display_new(data->image);
...
/* quantize double to 8bit int */
unsigned char quantize(double d, double max) {
return (unsigned char)((d / max) * 255.0);
}
Hugs,
Louise
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