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download PDF document: XpmCreateBufferFromPixmap.3.pdf

XpmCreateBuffer(3) libXpm functions XpmCreateBuffer(3)
NAME XpmCreateBuffer - create an XPM Buffer

SYNOPSIS
int XpmCreateBufferFromImage(Display *display , char **buffer_return, XImage *image, XImage *shapeimage, XpmAttributes *attributes);
int XpmCreateBufferFromPixmap(Display *display, char **buffer_return, Pixmap pixmap, Pixmap shapemask, XpmAttributes *attributes);
int XpmCreateBufferFromXpmImage(char **buffer_return, XpmImage *image, XpmInfo *info);

ARGUMENTS display Specifies the connection to the X server.
buffer_return Returns the buffer which is created.
image Specifies the image.
shapeimage Specifies the shape mask image.
attributes Specifies the location of a structure containing information (or NULL).
info Specifies the location of a structure to get possible information (or NULL).

DESCRIPTION XpmCreateBufferFromPixmap XpmCreateBufferFromPixmap() creates an XPM buffer from a Pixmap. The XpmCreateBufferFromPixmap() function works as XpmWriteFileFromPixmap(3), it just calls XpmCreateBufferFromImage() instead of XpmWriteFileFromImage(3). Once again, the caller should free the buffer using XpmFree(3) when finished.
As a convenience, the XpmReadFileToBuffer(3) and XpmWriteFileFromBuffer(3) functions are provided to copy a file to a buffer and to write a file from a buffer. Thus for instance one may decide to use XpmCreateBufferFromPixmap(), XpmWriteFileFromBuffer(3), and XpmFree(3) instead of XpmWriteFileFromPixmap(3). On some systems this may lead to a performance improvement, since the processing will be performed in memory, but it uses more memory.

XpmCreateBufferFromImage The XpmCreateBufferFromImage() function works as XpmWriteFileFromImage(3), it just writes to a malloc'ed buffer instead of to a file. The caller should free the buffer using XpmFree(3) when in XPM format. If insufficient working storage is allocated, it returns XpmNoMemory, and returns XpmSuccess on success. If the passed XpmInfo structure pointer is not NULL, XpmCreateBufferFromXpmImage() looks for the following attributes: XpmComments, XpmExtensions, and XpmHotspot, and writes the related information out as well. The caller should free the buffer using XpmFree(3) when finished.

SEE ALSO XpmFree(3), XpmWriteFileFromBuffer(3), XpmWriteFileFromImage(3), XpmWriteFileFromPixmap(3)
X Version 11 libXpm 3.5.17 XpmCreateBuffer(3)