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375 lines
9.4 KiB
375 lines
9.4 KiB
/* |
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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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