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#include <string.h>
#include "gtkvumeter.h"
#define MIN_HORIZONTAL_VUMETER_WIDTH 40
#define HORIZONTAL_VUMETER_HEIGHT 20
#define VERTICAL_VUMETER_WIDTH 20
#define MIN_VERTICAL_VUMETER_HEIGHT 40
G_DEFINE_TYPE (GtkVuMeter, gtk_vu_meter, GTK_TYPE_DRAWING_AREA);
static GdkColor default_f_gradient_keys[3] = {{0,65535,0,0},{0,65535,65535,0},{0,0,65535,0}};
static GdkColor default_b_gradient_keys[3] = {{0,49151,0,0},{0,49151,49151,0},{0,0,49151,0}};
static gboolean gtk_vu_meter_expose (GtkWidget *vumeter, GdkEventExpose *event);
static void gtk_vu_meter_setup_colors (GtkVuMeter *vumeter);
static void gtk_vu_meter_free_colors (GtkVuMeter *vumeter);
static void free_drawbuf(guchar *pixels, gpointer data);
static void gtk_vu_meter_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void gtk_vu_meter_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
static gint gtk_vu_meter_sound_level_to_draw_level (GtkVuMeter *vumeter);
static void gtk_vu_meter_class_init (GtkVuMeterClass *class) {
GtkWidgetClass *widget_class;
widget_class = GTK_WIDGET_CLASS (class);
widget_class->expose_event = gtk_vu_meter_expose;
widget_class->size_request = gtk_vu_meter_size_request;
widget_class->size_allocate = gtk_vu_meter_size_allocate;
}
static void gtk_vu_meter_init (GtkVuMeter *vumeter) {
vumeter->vertical=TRUE;
gtk_vu_meter_set_gradient(vumeter, 3, default_f_gradient_keys, 3, default_b_gradient_keys);
gtk_vu_meter_setup_colors(vumeter);
}
void gtk_vu_meter_set_gradient (GtkVuMeter *vumeter, gint f_gradient_key_count, GdkColor *f_gradient_keys, gint b_gradient_key_count, GdkColor *b_gradient_keys) {
//XXX : memdup is a bad idea ?
GdkColor *fgk = g_memdup(f_gradient_keys, f_gradient_key_count*sizeof(GdkColor));
GdkColor *bgk = g_memdup(b_gradient_keys, b_gradient_key_count*sizeof(GdkColor));
g_return_if_fail (fgk != NULL);
g_return_if_fail (bgk != NULL);
vumeter->f_gradient_keys = fgk;
vumeter->f_gradient_key_count=f_gradient_key_count;
vumeter->b_gradient_keys = bgk;
vumeter->b_gradient_key_count=b_gradient_key_count;
}
static void gtk_vu_meter_free_colors (GtkVuMeter *vumeter) {
// TODO : free pixmaps
}
static void gtk_vu_meter_setup_colors (GtkVuMeter *vumeter) {
gint i,j;
guchar *f_drawbuf, *b_drawbuf, f_r, f_g, f_b, b_r, b_g, b_b;
gint f_key_len, b_key_len;
gint f_key_i, b_key_i;
gdouble f_key_pos, b_key_pos;
GdkColor *fgk, *bgk;
gint h=GTK_WIDGET(vumeter)->allocation.height;
gint w=GTK_WIDGET(vumeter)->allocation.width;
// Clean every previous colors and buffers
gtk_vu_meter_free_colors (vumeter);
if (vumeter->vertical == TRUE) {
vumeter->colors = MAX(h, 0);
} else {
vumeter->colors = MAX(w, 0);
}
// Allocate a memory buffers to hold the gradients
f_drawbuf=g_malloc(h*w*3);
b_drawbuf=g_malloc(h*w*3);
g_return_if_fail (f_drawbuf != NULL);
g_return_if_fail (b_drawbuf != NULL);
// Compute some values before looping for gradient generation
f_key_len = vumeter->colors / (vumeter->f_gradient_key_count-1) + 1;
b_key_len = vumeter->colors / (vumeter->b_gradient_key_count-1) + 1;
fgk=vumeter->f_gradient_keys;
bgk=vumeter->b_gradient_keys;
for (i=0; i<vumeter->colors; i++) {
// Compute the current position in the gradient keys
f_key_i=i/f_key_len;
f_key_pos=((gdouble) (i%f_key_len)/f_key_len);
b_key_i=i/f_key_len;
b_key_pos=((gdouble) (i%b_key_len)/b_key_len);
/* Generate the Colours */
/* foreground */
f_r = ( fgk[f_key_i].red*(1.0-f_key_pos) + fgk[f_key_i+1].red*f_key_pos ) / 256;
f_g = ( fgk[f_key_i].green*(1.0-f_key_pos) + fgk[f_key_i+1].green*f_key_pos ) / 256;
f_b = ( fgk[f_key_i].blue*(1.0-f_key_pos) + fgk[f_key_i+1].blue*f_key_pos ) / 256;
/* background */
b_r = ( bgk[b_key_i].red*(1.0-b_key_pos) + bgk[b_key_i+1].red*b_key_pos ) / 256;
b_g = ( bgk[b_key_i].green*(1.0-b_key_pos) + bgk[b_key_i+1].green*b_key_pos ) / 256;
b_b = ( bgk[b_key_i].blue*(1.0-b_key_pos) + bgk[b_key_i+1].blue*b_key_pos ) / 256;
/* Apply the color in the drawbufs */
if (vumeter->vertical == TRUE) {
// Vertical mode : draw directly the whole line of identical color
for (j=3*w*i; j<3*w*(i+1); ) {
f_drawbuf[j++]=f_r;
f_drawbuf[j++]=f_g;
f_drawbuf[j++]=f_b;
}
for (j=3*w*i; j<3*w*(i+1); ) {
b_drawbuf[j++]=b_r;
b_drawbuf[j++]=b_g;
b_drawbuf[j++]=b_b;
}
} else {
// Horiziontal mode : draw only the first line (color change at each pixel)
// Others line will be duplicated at the end
f_drawbuf[i]=f_r;
f_drawbuf[i+1]=f_g;
f_drawbuf[i+2]=f_b;
b_drawbuf[i]=b_r;
b_drawbuf[i+1]=b_g;
b_drawbuf[i+2]=b_b;
}
}
if (vumeter->vertical != TRUE) {
// Duplicate the first line over the others
for (j=1; j<h; j++) {
memcpy(f_drawbuf, f_drawbuf+3*w*j, w);
}
}
vumeter->f_pixbuf = gdk_pixbuf_new_from_data(f_drawbuf, GDK_COLORSPACE_RGB, FALSE, 8, w, h, w*3, free_drawbuf, NULL);
vumeter->b_pixbuf = gdk_pixbuf_new_from_data(b_drawbuf, GDK_COLORSPACE_RGB, FALSE, 8, w, h, w*3, free_drawbuf, NULL);
}
static void gtk_vu_meter_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
GtkVuMeter *vumeter;
g_return_if_fail (GTK_IS_VU_METER (widget));
g_return_if_fail (requisition != NULL);
vumeter = GTK_VU_METER (widget);
if (vumeter->vertical == TRUE) {
requisition->width = VERTICAL_VUMETER_WIDTH;
requisition->height = MIN_VERTICAL_VUMETER_HEIGHT;
} else {
requisition->width = MIN_HORIZONTAL_VUMETER_WIDTH;
requisition->height = HORIZONTAL_VUMETER_HEIGHT;
}
}
static void gtk_vu_meter_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
GtkVuMeter *vumeter;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VU_METER (widget));
g_return_if_fail (allocation != NULL);
widget->allocation = *allocation;
vumeter = GTK_VU_METER (widget);
if (GTK_WIDGET_REALIZED (widget)) {
if (vumeter->vertical == TRUE) { /* veritcal */
gdk_window_move_resize (widget->window, allocation->x, allocation->y,
VERTICAL_VUMETER_WIDTH, MAX(allocation->height, MIN_VERTICAL_VUMETER_HEIGHT));
} else { /* horizontal */
gdk_window_move_resize (widget->window, allocation->x, allocation->y,
MAX(allocation->width, MIN_HORIZONTAL_VUMETER_WIDTH), HORIZONTAL_VUMETER_HEIGHT);
}
/* Fix the colours */
gtk_vu_meter_setup_colors (vumeter);
}
}
static void free_drawbuf(guchar *pixels, gpointer data) {
g_free(pixels);
}
static gboolean gtk_vu_meter_expose (GtkWidget *vumeter, GdkEventExpose *event) {
//gdk_pixbuf_render_to_drawable(pixbuf, dbuf_pixmap, app->style->fg_gc[GTK_STATE_NORMAL], 0, 0, 0, 0, WIDTH, HEIGHT, GDK_RGB_DITHER_NORMAL, 0, 0);
cairo_t *cr;
gint draw_level = gtk_vu_meter_sound_level_to_draw_level(GTK_VU_METER(vumeter));
cr = gdk_cairo_create (vumeter->window);
// set a clip region for the expose event
cairo_rectangle (cr,event->area.x, event->area.y, event->area.width, event->area.height);
cairo_clip(cr);
// Paint from the stored gradient
gdk_cairo_set_source_pixbuf(cr, GTK_VU_METER(vumeter)->b_pixbuf,0,0);
cairo_paint(cr);
// set a clip region for the expose event
if (GTK_VU_METER(vumeter)->vertical==TRUE) {
cairo_rectangle (cr,event->area.x, event->area.y+draw_level, event->area.width, event->area.height-draw_level);
} else {
//TODO
cairo_rectangle (cr,event->area.x, event->area.y, event->area.width, 12/*event->area.height*/);
}
cairo_clip(cr);
// Paint from the stored gradient
gdk_cairo_set_source_pixbuf(cr, GTK_VU_METER(vumeter)->f_pixbuf,0,0);
cairo_paint(cr);
cairo_destroy(cr);
return FALSE;
}
static gint gtk_vu_meter_sound_level_to_draw_level (GtkVuMeter *vumeter) {
gint draw_level;
gdouble level, min, max, height;
level = (gdouble)vumeter->level;
min = (gdouble)vumeter->min;
max = (gdouble)vumeter->max;
height = (gdouble)vumeter->colors;
draw_level = (1.0 - (level - min)/(max - min)) * height;
//printf("1.0 - (%lf - %lf)/(%lf - %lf)) * %lf => %i\n", level, min, max, min, height, draw_level);
return draw_level;
}
GtkWidget * gtk_vu_meter_new (gboolean vertical) {
GtkWidget *vumeter = g_object_new (GTK_TYPE_VU_METER, NULL);
GTK_VU_METER(vumeter)->vertical=vertical;
GTK_VU_METER(vumeter)->level=0;
GTK_VU_METER(vumeter)->min=-32767;
GTK_VU_METER(vumeter)->max=32767;
return vumeter;
}
void gtk_vu_meter_set_min_max (GtkVuMeter *vumeter, gint min, gint max)
{
g_return_if_fail (vumeter != NULL);
vumeter->max = MAX(max, min);
vumeter->min = MIN(min, max);
if (vumeter->max == vumeter->min) {
vumeter->max++;
}
vumeter->level = CLAMP (vumeter->level, vumeter->min, vumeter->max);
gtk_widget_queue_draw (GTK_WIDGET(vumeter));
}
void gtk_vu_meter_set_level(GtkVuMeter *vumeter, gint level)
{
g_return_if_fail (vumeter != NULL);
vumeter->level = CLAMP (level, vumeter->min, vumeter->max);
gtk_widget_queue_draw (GTK_WIDGET(vumeter));
}
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