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Top Forums Programming Xlib - Rotation and interpolation of pixmap - Performance problems Post 302909125 by mghis on Monday 14th of July 2014 04:29:24 PM
Old 07-14-2014
Thank you, migurus, for your reply.
It did speed it up a bit, but I noticed the problem is mainly in the XAllocColor() call. In fact, if I remove that call and always put a black pixel, (still calculating the values), the program runs at less than half a second per rotation.

However I really don't know to get rid of XAllocColor().

I am writing pixels to an XImage. Is there a way to access directly the RGB values of each pixel?
 

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mlib_VideoInterpX_Y_XY_U8_U8(3MLIB)			    mediaLib Library Functions			       mlib_VideoInterpX_Y_XY_U8_U8(3MLIB)

NAME
mlib_VideoInterpX_Y_XY_U8_U8 - half-pixel interpolation in both X and Y directions for replenishment mode SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_VideoInterpX_Y_XY_U8_U8(mlib_u8 *outputX, mlib_u8 *outputY, mlib_u8 *outputXY, const mlib_u8 *image, mlib_s32 stride, mlib_s32 width, mlib_s32 height); DESCRIPTION
The mlib_VideoInterpX_Y_XY_U8_U8() function performs half-pixel interpolation in both X and Y directions for the replenishment mode. PARAMETERS
The function takes the following arguments: outputX Pointer to the output of X-interpolation. outputX must be 8-byte aligned. outputY Pointer to the output of Y-interpolation. outputY must be 8-byte aligned. outputXY Pointer to the output of XY-interpolation. outputXY must be 8-byte aligned. image Pointer to the image data. image must be 8-byte aligned stride Stride, in bytes, between adjacent rows in the image. stride must be a multiple of eight. width Width of the image. width must be a multiple of eight. height Height of the image. height must be a multiple of two. RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_VideoInterpX_U8_U8(3MLIB), mlib_VideoInterpXY_U8_U8(3MLIB), mlib_VideoInterpY_U8_U8(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_VideoInterpX_Y_XY_U8_U8(3MLIB)
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