Hi All.
im a noob to scripting. could somone help me with a script please.
what i want to do is.
1. run a cmd in the script - qmqtool -s
this will give me an output similar to this.
Messages in local queue: 790
Messages in remote queue: 306
Messages in todo queue: 23
i then want... (1 Reply)
Hello. Complete newbie over here, and I'm hoping you can help me out with this problem.
The script copies a file to a directory within my home dir.
Permissions are ok and the source file exists. If I execute the cp command from the command line or hardcode the path/file name, it works.
... (6 Replies)
Hello,
I'm trying to create the shell script that:
copy (or transfer) the directory from the unix server to my external hard drive (or hard drive)
I've been serching this kind of thread here, but no luck so far. anyone can help me? Thank you. (2 Replies)
Writing a bash script for use with Geektool, pulls the battery info, and shuffles images around so that an Image geeklet can display the correct expression as the desktop background. (Eventually I intend to make it more intricate, based on more variables, and add more expressions)
I'm extremely... (1 Reply)
Hello everyone
I am completely new to shell scripting in linux. I wan to write a script to search for a certain string from a .txt file and copy the string which apears just after tat searched string.
Eg: in a file- try.txt , we have a line saying: "roses are red, so what do i do"
I... (4 Replies)
Hello,
I'm new to this forum and like to first of all say hello to everyone.
I've got a really annoying problem at the moment.
I'm trying to rsync some files (about 200MB with one file of 120MB) from a Raspberry PI with raspbian to a debian server via rsync.
This procedure is stored in a... (3 Replies)
Dear All,
I have a situation where I want to copy some files of type .txt.
These files are o/p from one program. Some of the files are named as
fileName .txt instead of fileName.txt
after fileName by mistake I have specified "space". Now I want to move these files as follows.
mv fileName*... (13 Replies)
Hello,
I'm trying to write a script in Dialog for configuring a router. I basically need the user to select from a list of say 4 options, confirm the option and then copy the configuration files, depending on the choice to the HDD and then reboot (I'm hoping to boot from a USB stick).
The... (0 Replies)
Hello All,
I have a file of ip addresses called activeips.txt
What I'm trying to do is run a simple bash script that has a loop in it. The loop is a cat of the IP addresses in the file.
The goal is to run 2 nmap commands to give me outputs where each address in the list has an OS... (11 Replies)
The bash stores each uniqueid in an array and then passes them to %q to get the unique path. That seems to work what I am having trouble with is renaming each .png with the unique value in %q. I thought it was working but upon closer inspection, a .png file is being sent to scp.... but only 1 and... (21 Replies)
Discussion started by: cmccabe
21 Replies
LEARN ABOUT REDHAT
sdl_pixelformat
SDL_PixelFormat(3) SDL API Reference SDL_PixelFormat(3)NAME
SDL_PixelFormat- Stores surface format information
STRUCTURE DEFINITION
typedef struct{
SDL_Palette *palette;
Uint8 BitsPerPixel;
Uint8 BytesPerPixel;
Uint32 Rmask, Gmask, Bmask, Amask;
Uint8 Rshift, Gshift, Bshift, Ashift;
Uint8 Rloss, Gloss, Bloss, Aloss;
Uint32 colorkey;
Uint8 alpha;
} SDL_PixelFormat;
STRUCTURE DATA
palette Pointer to the palette, or NULL if the BitsPerPixel>8
BitsPerPixel The number of bits used to represent each pixel in a surface. Usually 8, 16, 24 or 32.
BytesPerPixel The number of bytes used to represent each pixel in a surface. Usually one to four.
[RGBA]mask Binary mask used to retrieve individual color values
[RGBA]loss Precision loss of each color component (2^[RGBA]loss)
[RGBA]shift Binary left shift of each color component in the pixel value
colorkey Pixel value of transparent pixels
alpha Overall surface alpha value
DESCRIPTION
A SDL_PixelFormat describes the format of the pixel data stored at the pixels field of a SDL_Surface. Every surface stores a SDL_PixelFor-
mat in the format field.
If you wish to do pixel level modifications on a surface, then understanding how SDL stores its color information is essential.
8-bit pixel formats are the easiest to understand. Since its an 8-bit format, we have 8 BitsPerPixel and 1 BytesPerPixel. Since BytesPer-
Pixel is 1, all pixels are represented by a Uint8 which contains an index into palette->colors. So, to determine the color of a pixel in a
8-bit surface: we read the color index from surface->pixels and we use that index to read the SDL_Color structure from surface->for-
mat->palette->colors. Like so:
SDL_Surface *surface;
SDL_PixelFormat *fmt;
SDL_Color *color;
Uint8 index;
.
.
/* Create surface */
.
.
fmt=surface->format;
/* Check the bitdepth of the surface */
if(fmt->BitsPerPixel!=8){
fprintf(stderr, "Not an 8-bit surface.
");
return(-1);
}
/* Lock the surface */
SDL_LockSurface(surface);
/* Get the topleft pixel */
index=*(Uint8 *)surface->pixels;
color=fmt->palette->colors[index];
/* Unlock the surface */
SDL_UnlockSurface(surface);
printf("Pixel Color-> Red: %d, Green: %d, Blue: %d. Index: %d
",
color->r, color->g, color->b, index);
.
.
Pixel formats above 8-bit are an entirely different experience. They are considered to be "TrueColor" formats and the color information is
stored in the pixels themselves, not in a palette. The mask, shift and loss fields tell us how the color information is encoded. The mask
fields allow us to isolate each color component, the shift fields tell us the number of bits to the right of each component in the pixel
value and the loss fields tell us the number of bits lost from each component when packing 8-bit color component in a pixel.
/* Extracting color components from a 32-bit color value */
SDL_PixelFormat *fmt;
SDL_Surface *surface;
Uint32 temp, pixel;
Uint8 red, green, blue, alpha;
.
.
.
fmt=surface->format;
SDL_LockSurface(surface);
pixel=*((Uint32*)surface->pixels);
SDL_UnlockSurface(surface);
/* Get Red component */
temp=pixel&fmt->Rmask; /* Isolate red component */
temp=temp>>fmt->Rshift;/* Shift it down to 8-bit */
temp=temp<<fmt->Rloss; /* Expand to a full 8-bit number */
red=(Uint8)temp;
/* Get Green component */
temp=pixel&fmt->Gmask; /* Isolate green component */
temp=temp>>fmt->Gshift;/* Shift it down to 8-bit */
temp=temp<<fmt->Gloss; /* Expand to a full 8-bit number */
green=(Uint8)temp;
/* Get Blue component */
temp=pixel&fmt->Bmask; /* Isolate blue component */
temp=temp>>fmt->Bshift;/* Shift it down to 8-bit */
temp=temp<<fmt->Bloss; /* Expand to a full 8-bit number */
blue=(Uint8)temp;
/* Get Alpha component */
temp=pixel&fmt->Amask; /* Isolate alpha component */
temp=temp>>fmt->Ashift;/* Shift it down to 8-bit */
temp=temp<<fmt->Aloss; /* Expand to a full 8-bit number */
alpha=(Uint8)temp;
printf("Pixel Color -> R: %d, G: %d, B: %d, A: %d
", red, green, blue, alpha);
.
.
.
SEE ALSO
SDL_Surface, SDL_MapRGB
SDL Tue 11 Sep 2001, 23:01 SDL_PixelFormat(3)