XReadBitmapFile(3X11)RISC/os Reference ManuaXReadBitmapFile(3X11)
NAME
XReadBitmapFile, XWriteBitmapFile, XCreatePixmapFromBitmap-
Data, XCreateBitmapFromData - manipulate bitmaps
SYNTAX
int XReadBitmapFile(display, d, filename, width_return,
height_return, bitmap_return, x_hot_return,
y_hot_return)
Display *display;
Drawable d;
char *filename;
unsigned int *width_return, *height_return;
Pixmap *bitmap_return;
int *x_hot_return, *y_hot_return;
int XWriteBitmapFile(display, filename, bitmap, width,
height, x_hot, y_hot)
Display *display;
char *filename;
Pixmap bitmap;
unsigned int width, height;
int x_hot, y_hot;
Pixmap XCreatePixmapFromBitmapData(display, d, data, width,
height, fg, bg, depth)
Display *display;
Drawable d;
char *data;
unsigned int width, height;
unsigned long fg, bg;
unsigned int depth;
Pixmap XCreateBitmapFromData(display, d, data, width,
height)
Display *display;
Drawable d;
char *data;
unsigned int width, height;
ARGUMENTS
bitmap Specifies the bitmap.
bitmap_return
Returns the bitmap that is created.
d Specifies the drawable that indicates the screen.
data Specifies the data in bitmap format.
data Specifies the location of the bitmap data.
depth Specifies the depth of the pixmap.
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XReadBitmapFile(3X11)RISC/os Reference ManuaXReadBitmapFile(3X11)
display Specifies the connection to the X server.
fg
bg Specify the foreground and background pixel values
to use.
filename Specifies the file name to use. The format of the
file name is operating-system dependent.
width
height Specify the width and height.
width_return
height_return
Return the width and height values of the read in
bitmap file.
x_hot
y_hot Specify where to place the hotspot coordinates (or
-1,-1 if none are present) in the file.
x_hot_return
y_hot_return
Return the hotspot coordinates.
DESCRIPTION
The XReadBitmapFile function reads in a file containing a
bitmap. The ability to read other than the standard format
is implementation dependent. If the file cannot be opened,
XReadBitmapFile returns BitmapOpenFailed. If the file can
be opened but does not contain valid bitmap data, it returns
BitmapFileInvalid. If insufficient working storage is allo-
cated, it returns BitmapNoMemory. If the file is readable
and valid, it returns BitmapSuccess.
XReadBitmapFile returns the bitmap's height and width, as
read from the file, to width_return and height_return. It
then creates a pixmap of the appropriate size, reads the
bitmap data from the file into the pixmap, and assigns the
pixmap to the caller's variable bitmap. The caller must free
the bitmap using XFreePixmap when finished. If name_x_hot
and name_y_hot exist, XReadBitmapFile returns them to
x_hot_return and y_hot_return; otherwise, it returns -1,-1.
XReadBitmapFile can generate BadAlloc and BadDrawable
errors.
The XWriteBitmapFile function writes a bitmap out to a file
in the X version 11 format. If the file cannot be opened
for writing, it returns BitmapOpenFailed. If insufficient
memory is allocated, XWriteBitmapFile returns Bitmap-
NoMemory; otherwise, on no error, it returns BitmapSuccess.
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XReadBitmapFile(3X11)RISC/os Reference ManuaXReadBitmapFile(3X11)
If x_hot and y_hot are not -1, -1, XWriteBitmapFile writes
them out as the hotspot coordinates for the bitmap.
XWriteBitmapFile can generate BadDrawable and BadMatch
errors.
The XCreatePixmapFromBitmapData function creates a pixmap of
the given depth and then does a bitmap-format XPutImage of
the data into it. The depth must be supported by the screen
of the specified drawable, or a BadMatch error results.
XCreatePixmapFromBitmapData can generate BadAlloc and Bad-
Match errors.
The XCreateBitmapFromData function allows you to include in
your C program (using #include) a bitmap file that was writ-
ten out by XWriteBitmapFile (X version 11 format only)
without reading in the bitmap file. The following example
creates a gray bitmap:
#include "gray.bitmap"
Pixmap bitmap;
bitmap = XCreateBitmapFromData(display, window, gray_bits, gray_width, gray_height);
If insufficient working storage was allocated, XCreateBit-
mapFromData returns None. It is your responsibility to free
the bitmap using XFreePixmap when finished.
XCreateBitmapFromData can generate a BadAlloc error.
DIAGNOSTICS
BadAlloc The server failed to allocate the requested
resource or server memory.
BadDrawable
A value for a Drawable argument does not name a
defined Window or Pixmap.
BadMatch An InputOnly window is used as a Drawable.
SEE ALSO
Xlib - C Language X Interface
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