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94fee4a74d
This was forgotten inf96bdf564f
("drm/rect: Handle rounding errors in drm_rect_clip_scaled, v3.") Spotted while reviewing patches from Ville touching this area. Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Fixes:f96bdf564f
("drm/rect: Handle rounding errors in drm_rect_clip_scaled, v3.") Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191126145213.380079-1-daniel.vetter@ffwll.ch
376 lines
9.4 KiB
C
376 lines
9.4 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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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <drm/drm_mode.h>
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#include <drm/drm_print.h>
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#include <drm/drm_rect.h>
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/**
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* drm_rect_intersect - intersect two rectangles
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* @r1: first rectangle
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* @r2: second rectangle
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*
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* Calculate the intersection of rectangles @r1 and @r2.
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* @r1 will be overwritten with the intersection.
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*
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* RETURNS:
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* %true if rectangle @r1 is still visible after the operation,
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* %false otherwise.
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*/
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bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2)
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{
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r1->x1 = max(r1->x1, r2->x1);
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r1->y1 = max(r1->y1, r2->y1);
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r1->x2 = min(r1->x2, r2->x2);
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r1->y2 = min(r1->y2, r2->y2);
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return drm_rect_visible(r1);
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}
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EXPORT_SYMBOL(drm_rect_intersect);
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static u32 clip_scaled(int src, int dst, int *clip)
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{
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u64 tmp;
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if (dst == 0)
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return 0;
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/* Only clip what we have. Keeps the result bounded. */
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*clip = min(*clip, dst);
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tmp = mul_u32_u32(src, dst - *clip);
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/*
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* Round toward 1.0 when clipping so that we don't accidentally
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* change upscaling to downscaling or vice versa.
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*/
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if (src < (dst << 16))
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return DIV_ROUND_UP_ULL(tmp, dst);
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else
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return DIV_ROUND_DOWN_ULL(tmp, dst);
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}
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/**
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* drm_rect_clip_scaled - perform a scaled clip operation
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* @src: source window rectangle
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* @dst: destination window rectangle
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* @clip: clip rectangle
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*
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* Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
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* the corresponding amounts, retaining the vertical and horizontal scaling
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* factors from @src to @dst.
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*
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* RETURNS:
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*
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* %true if rectangle @dst is still visible after being clipped,
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* %false otherwise.
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*/
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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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{
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int diff;
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diff = clip->x1 - dst->x1;
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if (diff > 0) {
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u32 new_src_w = clip_scaled(drm_rect_width(src),
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drm_rect_width(dst), &diff);
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src->x1 = src->x2 - new_src_w;
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dst->x1 += diff;
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}
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diff = clip->y1 - dst->y1;
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if (diff > 0) {
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u32 new_src_h = clip_scaled(drm_rect_height(src),
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drm_rect_height(dst), &diff);
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src->y1 = src->y2 - new_src_h;
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dst->y1 += diff;
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}
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diff = dst->x2 - clip->x2;
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if (diff > 0) {
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u32 new_src_w = clip_scaled(drm_rect_width(src),
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drm_rect_width(dst), &diff);
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src->x2 = src->x1 + new_src_w;
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dst->x2 -= diff;
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}
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diff = dst->y2 - clip->y2;
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if (diff > 0) {
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u32 new_src_h = clip_scaled(drm_rect_height(src),
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drm_rect_height(dst), &diff);
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src->y2 = src->y1 + new_src_h;
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dst->y2 -= diff;
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}
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return drm_rect_visible(dst);
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}
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EXPORT_SYMBOL(drm_rect_clip_scaled);
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static int drm_calc_scale(int src, int dst)
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{
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int scale = 0;
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if (WARN_ON(src < 0 || dst < 0))
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return -EINVAL;
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if (dst == 0)
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return 0;
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if (src > (dst << 16))
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return DIV_ROUND_UP(src, dst);
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else
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scale = src / dst;
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return scale;
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}
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/**
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* drm_rect_calc_hscale - calculate the horizontal scaling factor
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* @src: source window rectangle
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* @dst: destination window rectangle
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* @min_hscale: minimum allowed horizontal scaling factor
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* @max_hscale: maximum allowed horizontal scaling factor
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*
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* Calculate the horizontal scaling factor as
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* (@src width) / (@dst width).
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*
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* If the scale is below 1 << 16, round down. If the scale is above
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* 1 << 16, round up. This will calculate the scale with the most
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* pessimistic limit calculation.
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*
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* RETURNS:
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* The horizontal scaling factor, or errno of out of limits.
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*/
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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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{
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int src_w = drm_rect_width(src);
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int dst_w = drm_rect_width(dst);
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int hscale = drm_calc_scale(src_w, dst_w);
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if (hscale < 0 || dst_w == 0)
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return hscale;
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if (hscale < min_hscale || hscale > max_hscale)
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return -ERANGE;
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return hscale;
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}
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EXPORT_SYMBOL(drm_rect_calc_hscale);
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/**
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* drm_rect_calc_vscale - calculate the vertical scaling factor
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* @src: source window rectangle
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* @dst: destination window rectangle
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* @min_vscale: minimum allowed vertical scaling factor
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* @max_vscale: maximum allowed vertical scaling factor
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*
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* Calculate the vertical scaling factor as
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* (@src height) / (@dst height).
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*
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* If the scale is below 1 << 16, round down. If the scale is above
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* 1 << 16, round up. This will calculate the scale with the most
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* pessimistic limit calculation.
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*
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* RETURNS:
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* The vertical scaling factor, or errno of out of limits.
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*/
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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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{
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int src_h = drm_rect_height(src);
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int dst_h = drm_rect_height(dst);
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int vscale = drm_calc_scale(src_h, dst_h);
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if (vscale < 0 || dst_h == 0)
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return vscale;
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if (vscale < min_vscale || vscale > max_vscale)
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return -ERANGE;
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return vscale;
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}
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EXPORT_SYMBOL(drm_rect_calc_vscale);
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/**
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* drm_rect_debug_print - print the rectangle information
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* @prefix: prefix string
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* @r: rectangle to print
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* @fixed_point: rectangle is in 16.16 fixed point format
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*/
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void drm_rect_debug_print(const char *prefix, const struct drm_rect *r, bool fixed_point)
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{
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if (fixed_point)
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DRM_DEBUG_KMS("%s" DRM_RECT_FP_FMT "\n", prefix, DRM_RECT_FP_ARG(r));
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else
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DRM_DEBUG_KMS("%s" DRM_RECT_FMT "\n", prefix, DRM_RECT_ARG(r));
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}
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EXPORT_SYMBOL(drm_rect_debug_print);
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/**
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* drm_rect_rotate - Rotate the rectangle
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* @r: rectangle to be rotated
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* @width: Width of the coordinate space
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* @height: Height of the coordinate space
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* @rotation: Transformation to be applied
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*
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* Apply @rotation to the coordinates of rectangle @r.
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*
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* @width and @height combined with @rotation define
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* the location of the new origin.
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*
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* @width correcsponds to the horizontal and @height
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* to the vertical axis of the untransformed coordinate
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* space.
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*/
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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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{
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struct drm_rect tmp;
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if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
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tmp = *r;
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if (rotation & DRM_MODE_REFLECT_X) {
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r->x1 = width - tmp.x2;
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r->x2 = width - tmp.x1;
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}
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if (rotation & DRM_MODE_REFLECT_Y) {
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r->y1 = height - tmp.y2;
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r->y2 = height - tmp.y1;
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}
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}
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switch (rotation & DRM_MODE_ROTATE_MASK) {
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case DRM_MODE_ROTATE_0:
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break;
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case DRM_MODE_ROTATE_90:
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tmp = *r;
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r->x1 = tmp.y1;
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r->x2 = tmp.y2;
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r->y1 = width - tmp.x2;
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r->y2 = width - tmp.x1;
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break;
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case DRM_MODE_ROTATE_180:
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tmp = *r;
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r->x1 = width - tmp.x2;
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r->x2 = width - tmp.x1;
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r->y1 = height - tmp.y2;
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r->y2 = height - tmp.y1;
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break;
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case DRM_MODE_ROTATE_270:
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tmp = *r;
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r->x1 = height - tmp.y2;
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r->x2 = height - tmp.y1;
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r->y1 = tmp.x1;
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r->y2 = tmp.x2;
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break;
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default:
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break;
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}
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}
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EXPORT_SYMBOL(drm_rect_rotate);
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/**
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* drm_rect_rotate_inv - Inverse rotate the rectangle
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* @r: rectangle to be rotated
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* @width: Width of the coordinate space
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* @height: Height of the coordinate space
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* @rotation: Transformation whose inverse is to be applied
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*
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* Apply the inverse of @rotation to the coordinates
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* of rectangle @r.
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*
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* @width and @height combined with @rotation define
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* the location of the new origin.
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*
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* @width correcsponds to the horizontal and @height
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* to the vertical axis of the original untransformed
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* coordinate space, so that you never have to flip
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* them when doing a rotatation and its inverse.
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* That is, if you do ::
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*
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* drm_rect_rotate(&r, width, height, rotation);
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* drm_rect_rotate_inv(&r, width, height, rotation);
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*
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* you will always get back the original rectangle.
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*/
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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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{
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struct drm_rect tmp;
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switch (rotation & DRM_MODE_ROTATE_MASK) {
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case DRM_MODE_ROTATE_0:
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break;
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case DRM_MODE_ROTATE_90:
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tmp = *r;
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r->x1 = width - tmp.y2;
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r->x2 = width - tmp.y1;
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r->y1 = tmp.x1;
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r->y2 = tmp.x2;
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break;
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case DRM_MODE_ROTATE_180:
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tmp = *r;
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r->x1 = width - tmp.x2;
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r->x2 = width - tmp.x1;
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r->y1 = height - tmp.y2;
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r->y2 = height - tmp.y1;
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break;
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case DRM_MODE_ROTATE_270:
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tmp = *r;
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r->x1 = tmp.y1;
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r->x2 = tmp.y2;
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r->y1 = height - tmp.x2;
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r->y2 = height - tmp.x1;
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break;
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default:
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break;
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}
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if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
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tmp = *r;
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if (rotation & DRM_MODE_REFLECT_X) {
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r->x1 = width - tmp.x2;
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r->x2 = width - tmp.x1;
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}
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if (rotation & DRM_MODE_REFLECT_Y) {
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r->y1 = height - tmp.y2;
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r->y2 = height - tmp.y1;
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}
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}
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}
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EXPORT_SYMBOL(drm_rect_rotate_inv);
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