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implemented alpha blending (hopefully correctly!)

master
Bartek Kostrzewa 2010-11-22 17:41:21 +01:00
parent ce8c4e74ae
commit f3fdb74d03
3 changed files with 39 additions and 22 deletions
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2
clients/plasma.py
View File

@ -24,7 +24,7 @@ UDPSock.bind((outgoing_if, local_port))
segments = open('segments','r')
alpha = chr(255)
alpha = chr(125)
z_buffer = chr(1) + "\n"

55
frameserver/Server.cpp
View File

@ -164,6 +164,7 @@ void Server::mix()
while(1)
{
frame_t temp_frame;
float temp_alpha;
// we lock the buffers for a long time, but we need to make sure
// that none of the buffers is allowed to expire while we're working on it!
@ -179,10 +180,7 @@ void Server::mix()
{
for(int a = 0; a < CHANNELS; a++)
{
if( a == CHANNELS-1 )
frame.windows[i][j][a] = 255;
else
frame.windows[i][j][a] = 0;
frame.windows[i][j][a] = 0;
}
}
}
@ -193,15 +191,13 @@ void Server::mix()
{
for(int a = 0; a < SEGCHANNELS; a++)
{
if(a == SEGCHANNELS-1 )
frame.segments[w][n][a] = 255;
else
frame.segments[w][n][a] = 0;
frame.segments[w][n][a] = 0;
}
}
} // zero out frame
// implement alpha blending
for(int x = 0; x < size; x++)
{
temp_frame = buffers[x]->get();
@ -209,12 +205,17 @@ void Server::mix()
{
for(int j = 0; j < WIDTH; j++)
{
for(int a = 0; a < CHANNELS-1; a++)
temp_alpha = (float)temp_frame.windows[i][j][CHANNELS-1]/255;
for(int a = 0; a < CHANNELS; a++)
{
// do something interesting here
pixel = frame.windows[i][j][a] + (float)temp_frame.windows[i][j][CHANNELS-1]/255*temp_frame.windows[i][j][a];
// this works for the colors and for the alpha channel
pixel = (1-temp_alpha)*frame.windows[i][j][a] + temp_alpha*temp_frame.windows[i][j][a];
//make sure we don't do anything silly
if( pixel >= 255 )
frame.windows[i][j][a] = 255;
else if( pixel <= 0 )
frame.windows[i][j][a] = 0;
else
frame.windows[i][j][a] = pixel;
}
@ -225,11 +226,17 @@ void Server::mix()
{
for(int n = 0;n < SEGNUM; n++)
{
for(int a = 0; a < SEGCHANNELS-1; a++)
temp_alpha = (float)temp_frame.segments[w][n][SEGCHANNELS-1]/255;
for(int a = 0; a < SEGCHANNELS; a++)
{
pixel = frame.segments[w][n][a] + (float)temp_frame.segments[w][n][SEGCHANNELS-1]/255*temp_frame.segments[w][n][a];
// this works for the colors and for the alpha channel
pixel = (1-temp_alpha)*frame.segments[w][n][a] + temp_alpha*temp_frame.segments[w][n][a];
// make sure we don't make silly mistakes
if( pixel >= 255 )
frame.segments[w][n][a] = 255;
else if( pixel <= 0 )
frame.segments[w][n][a] = 0;
else
frame.segments[w][n][a] = pixel;
}
@ -237,6 +244,8 @@ void Server::mix()
}
}
// temp frame has validity in the loop only so it can be safely used without locking the whole object
// we do this in case output() takes a long time to return. If it read frame directly, we'd end up
// waiting for a long time
temp_frame = frame;
} // release lock and send off to hardware
output(temp_frame);
@ -303,7 +312,7 @@ void Server::input()
// now we need to lock data structure because we're going to use shared objects
{
Glib::Mutex::Lock lock(mutex_);
switch(c)
{
case KEY_F(2):
@ -320,7 +329,10 @@ void Server::input()
break;
case '0':
default:
console_input = c;
{
Glib::Mutex::Lock lock(mutex_);
console_input = c;
}
}
}
}
@ -428,8 +440,15 @@ void Server::console_printframe_values(frame_t _frame)
void Server::console_printclients()
{
int rows, cols, offset=0;
getmaxyx(stdscr,rows,cols);
for(int i = 0; i < buffers.size(); i++)
mvprintw(i+2,0,"(%3d) %s\n", i,buffers[i]->get_id().c_str() );
{
if(i >= 1 && i%(rows-2)==0)
offset += 27;
if( offset + 27 < cols )
mvprintw(i%(rows-2)+2,offset,"(%3d) %s\n", i,buffers[i]->get_id().c_str() );
}
}

4
frameserver/Server.h
View File

@ -54,9 +54,7 @@ private:
void mix();
void output(frame_t);
int get_size();
void expire();
void expire();
bool consoleinit;
int console_input;