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DRM_RECT_CALC_VSCALE(9) DRM Core DRM_RECT_CALC_VSCALE(9)

NAME

drm_rect_calc_vscale_relaxed - calculate the vertical scaling factor

SYNOPSIS

int drm_rect_calc_vscale_relaxed(struct drm_rect * src, struct drm_rect * dst, int min_vscale, int max_vscale);

ARGUMENTS

src
source window rectangle
dst
destination window rectangle
min_vscale
minimum allowed vertical scaling factor
max_vscale
maximum allowed vertical scaling factor

DESCRIPTION

Calculate the vertical scaling factor as ( src height) / ( dst height).
If the calculated scaling factor is below min_vscale, decrease the height of rectangle dst to compensate.
If the calculated scaling factor is above max_vscale, decrease the height of rectangle src to compensate.

RETURNS

The vertical scaling factor.

AUTHORS

Jesse Barnes <jesse.barnes@intel.com>
 
Intel Corporation,
Initial version
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 
Ideas on board SPRL,
Driver internals
Daniel Vetter <daniel.vetter@ffwll.ch>
 
Intel Corporation,
Contributions all over the place

COPYRIGHT

May 2018 Kernel Hackers Manual 3.16