Table of Contents
XReadBitmapFile, XReadBitmapFileData,
XWriteBitmapFile, XCreatePixmapFromBitmapData, XCreateBitmapFromData - manipulate
bitmaps
- int XReadBitmapFile(Display *display, Drawable d, char
- *filename,
unsigned int *width_return, unsigned int *height_return, Pixmap *bitmap_return,
int *x_hot_return, int *y_hot_return);
- int XReadBitmapFileData(char *filename,
unsigned int
- *width_return, unsigned int *height_return, unsigned char
*data_return, int *x_hot_return, int *y_hot_return);
- int XWriteBitmapFile(Display
*display, char *filename,
- Pixmap bitmap, unsigned int width, unsigned int
height, int x_hot, int y_hot);
- Pixmap XCreatePixmapFromBitmapData(Display
*display, Drawable
- d, char *data, unsigned int width, unsigned int height,
unsigned long fg, unsigned long bg, unsigned int depth);
- Pixmap XCreateBitmapFromData(Display
*display, Drawable d,
- char *data, unsigned int width, unsigned int height);
- 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.
- data_return
- Returns the bitmap data.
- depth
- Specifies the depth of the pixmap.
- 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.
The XReadBitmapFile
function reads in a file containing a bitmap. The file is parsed in the
encoding of the current locale. 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 allocated, 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 XReadBitmapFileData function
reads in a file containing a bitmap, in the same manner as XReadBitmapFile,
but returns the data directly rather than creating a pixmap in the server.
The bitmap data is returned in data_return; the client must free this storage
when finished with it by calling XFree. The status and other return values
are the same as for XReadBitmapFile.
The XWriteBitmapFile function writes
a bitmap out to a file in the X Version 11 format. The name used in the
output file is derived from the file name by deleting the directory prefix.
The file is written in the encoding of the current locale. If the file cannot
be opened for writing, it returns BitmapOpenFailed. If insufficient
memory is allocated, XWriteBitmapFile returns BitmapNoMemory; otherwise,
on no error, it returns BitmapSuccess. 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
BadMatch errors.
The XCreateBitmapFromData function allows you to include
in your C program (using #include) a bitmap file that was written out
by XWriteBitmapFile (X version 11 format only) without reading in the
bitmap file. The following example creates a gray bitmap:
0
0>=40 .vs 0u
0<=39 .vs 0p
#include "gray.bitmap"
Pixmap bitmap;
bitmap = XCreateBitmapFromData(display, window, gray_bits, gray_width,
gray_height);
If insufficient working storage was allocated, XCreateBitmapFromData
returns None. It is your responsibility to free the bitmap using XFreePixmap
when finished.
XCreateBitmapFromData can generate a BadAlloc error.
- 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.
XCreatePixmap(3)
, XPutImage(3)
Xlib - C Language X Interface
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