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/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include "fb.h"
#include "fbclip.h"
static const BoxRec *
find_clip_row_for_y(const BoxRec *begin, const BoxRec *end, int16_t y)
{
const BoxRec *mid;
if (end == begin)
return end;
if (end - begin == 1) {
if (begin->y2 > y)
return begin;
else
return end;
}
mid = begin + (end - begin) / 2;
if (mid->y2 > y)
return find_clip_row_for_y(begin, mid, y);
else
return find_clip_row_for_y(mid, end, y);
}
const BoxRec *
fbClipBoxes(const RegionRec *region, const BoxRec *box, const BoxRec **end)
{
const BoxRec *c0, *c1;
DBG(("%s: box=(%d, %d),(%d, %d); region=(%d, %d),(%d, %d) x %ld\n",
__FUNCTION__,
box->x1, box->y1, box->x2, box->y2,
region->extents.x1, region->extents.y1,
region->extents.x2, region->extents.y2,
region->data ? region->data->numRects : 1));
if (box->x1 >= region->extents.x2 || box->x2 <= region->extents.x1 ||
box->y1 >= region->extents.y2 || box->y2 <= region->extents.y1) {
DBG(("%s: no intersection\n", __FUNCTION__));
return *end = box;
}
if (region->data == NULL) {
*end = ®ion->extents + 1;
return ®ion->extents;
}
c0 = (const BoxRec *)(region->data + 1);
c1 = c0 + region->data->numRects;
if (c0->y2 <= box->y1) {
DBG(("%s: first clip (%d, %d), (%d, %d) before box (%d, %d), (%d, %d)\n",
__FUNCTION__,
c0->x1, c0->y1, c0->x2, c0->y2,
box->x1, box->y1, box->x2, box->y2));
c0 = find_clip_row_for_y(c0, c1, box->y1);
}
DBG(("%s: c0=(%d, %d),(%d, %d) x %ld\n",
__FUNCTION__, c0->x1, c0->y1, c0->x2, c0->y2, c1 - c0));
*end = c1;
return c0;
}
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