228 lines
6.3 KiB
C
228 lines
6.3 KiB
C
/*
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* Copyright (C) 2011-2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef DRM_RECT_H
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#define DRM_RECT_H
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#include <linux/types.h>
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/**
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* DOC: rect utils
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*
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* Utility functions to help manage rectangular areas for
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* clipping, scaling, etc. calculations.
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*/
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/**
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* struct drm_rect - two dimensional rectangle
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* @x1: horizontal starting coordinate (inclusive)
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* @x2: horizontal ending coordinate (exclusive)
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* @y1: vertical starting coordinate (inclusive)
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* @y2: vertical ending coordinate (exclusive)
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*/
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struct drm_rect {
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int x1, y1, x2, y2;
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};
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/**
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* DRM_RECT_FMT - printf string for &struct drm_rect
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*/
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#define DRM_RECT_FMT "%dx%d%+d%+d"
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/**
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* DRM_RECT_ARG - printf arguments for &struct drm_rect
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* @r: rectangle struct
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*/
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#define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
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/**
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* DRM_RECT_FP_FMT - printf string for &struct drm_rect in 16.16 fixed point
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*/
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#define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
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/**
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* DRM_RECT_FP_ARG - printf arguments for &struct drm_rect in 16.16 fixed point
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* @r: rectangle struct
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*
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* This is useful for e.g. printing plane source rectangles, which are in 16.16
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* fixed point.
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*/
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#define DRM_RECT_FP_ARG(r) \
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drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
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drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
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(r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
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(r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
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/**
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* drm_rect_init - initialize the rectangle from x/y/w/h
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* @r: rectangle
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* @x: x coordinate
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* @y: y coordinate
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* @width: width
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* @height: height
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*/
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static inline void drm_rect_init(struct drm_rect *r, int x, int y,
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int width, int height)
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{
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r->x1 = x;
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r->y1 = y;
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r->x2 = x + width;
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r->y2 = y + height;
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}
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/**
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* drm_rect_adjust_size - adjust the size of the rectangle
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* @r: rectangle to be adjusted
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* @dw: horizontal adjustment
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* @dh: vertical adjustment
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*
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* Change the size of rectangle @r by @dw in the horizontal direction,
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* and by @dh in the vertical direction, while keeping the center
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* of @r stationary.
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*
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* Positive @dw and @dh increase the size, negative values decrease it.
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*/
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static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
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{
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r->x1 -= dw >> 1;
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r->y1 -= dh >> 1;
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r->x2 += (dw + 1) >> 1;
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r->y2 += (dh + 1) >> 1;
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}
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/**
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* drm_rect_translate - translate the rectangle
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* @r: rectangle to be tranlated
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* @dx: horizontal translation
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* @dy: vertical translation
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*
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* Move rectangle @r by @dx in the horizontal direction,
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* and by @dy in the vertical direction.
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*/
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static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
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{
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r->x1 += dx;
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r->y1 += dy;
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r->x2 += dx;
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r->y2 += dy;
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}
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/**
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* drm_rect_translate_to - translate the rectangle to an absolute position
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* @r: rectangle to be tranlated
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* @x: horizontal position
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* @y: vertical position
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*
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* Move rectangle @r to @x in the horizontal direction,
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* and to @y in the vertical direction.
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*/
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static inline void drm_rect_translate_to(struct drm_rect *r, int x, int y)
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{
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drm_rect_translate(r, x - r->x1, y - r->y1);
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}
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/**
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* drm_rect_downscale - downscale a rectangle
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* @r: rectangle to be downscaled
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* @horz: horizontal downscale factor
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* @vert: vertical downscale factor
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*
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* Divide the coordinates of rectangle @r by @horz and @vert.
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*/
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static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
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{
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r->x1 /= horz;
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r->y1 /= vert;
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r->x2 /= horz;
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r->y2 /= vert;
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}
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/**
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* drm_rect_width - determine the rectangle width
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* @r: rectangle whose width is returned
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*
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* RETURNS:
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* The width of the rectangle.
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*/
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static inline int drm_rect_width(const struct drm_rect *r)
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{
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return r->x2 - r->x1;
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}
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/**
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* drm_rect_height - determine the rectangle height
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* @r: rectangle whose height is returned
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*
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* RETURNS:
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* The height of the rectangle.
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*/
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static inline int drm_rect_height(const struct drm_rect *r)
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{
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return r->y2 - r->y1;
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}
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/**
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* drm_rect_visible - determine if the the rectangle is visible
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* @r: rectangle whose visibility is returned
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*
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* RETURNS:
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* %true if the rectangle is visible, %false otherwise.
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*/
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static inline bool drm_rect_visible(const struct drm_rect *r)
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{
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return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
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}
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/**
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* drm_rect_equals - determine if two rectangles are equal
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* @r1: first rectangle
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* @r2: second rectangle
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*
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* RETURNS:
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* %true if the rectangles are equal, %false otherwise.
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*/
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static inline bool drm_rect_equals(const struct drm_rect *r1,
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const struct drm_rect *r2)
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{
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return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
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r1->y1 == r2->y1 && r1->y2 == r2->y2;
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}
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bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
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bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
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const struct drm_rect *clip);
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int drm_rect_calc_hscale(const struct drm_rect *src,
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const struct drm_rect *dst,
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int min_hscale, int max_hscale);
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int drm_rect_calc_vscale(const struct drm_rect *src,
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const struct drm_rect *dst,
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int min_vscale, int max_vscale);
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void drm_rect_debug_print(const char *prefix,
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const struct drm_rect *r, bool fixed_point);
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void drm_rect_rotate(struct drm_rect *r,
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int width, int height,
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unsigned int rotation);
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void drm_rect_rotate_inv(struct drm_rect *r,
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int width, int height,
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unsigned int rotation);
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#endif
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