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/*
* Copyright © 2013 Soren Sandmann Pedersen
* Copyright © 2013 Red Hat, Inc.
*
* 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.
*
* Author: Soren Sandmann (soren.sandmann@gmail.com)
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <mmintrin.h>
#include <xmmintrin.h>
#include <emmintrin.h>
#include <tmmintrin.h>
#include "pixman-private.h"
#include "pixman-inlines.h"
typedef struct
{
int y;
uint64_t * buffer;
} line_t;
typedef struct
{
line_t lines[2];
pixman_fixed_t y;
pixman_fixed_t x;
uint64_t data[1];
} bilinear_info_t;
static void
ssse3_fetch_horizontal (bits_image_t *image, line_t *line,
int y, pixman_fixed_t x, pixman_fixed_t ux, int n)
{
uint32_t *bits = image->bits + y * image->rowstride;
__m128i vx = _mm_set_epi16 (
- (x + 1), x, - (x + 1), x,
- (x + ux + 1), x + ux, - (x + ux + 1), x + ux);
__m128i vux = _mm_set_epi16 (
- 2 * ux, 2 * ux, - 2 * ux, 2 * ux,
- 2 * ux, 2 * ux, - 2 * ux, 2 * ux);
__m128i vaddc = _mm_set_epi16 (1, 0, 1, 0, 1, 0, 1, 0);
__m128i *b = (__m128i *)line->buffer;
__m128i vrl0, vrl1;
while ((n -= 2) >= 0)
{
__m128i vw, vr, s;
vrl1 = _mm_loadl_epi64 (
(__m128i *)(bits + pixman_fixed_to_int (x + ux)));
/* vrl1: R1, L1 */
final_pixel:
vrl0 = _mm_loadl_epi64 (
(__m128i *)(bits + pixman_fixed_to_int (x)));
/* vrl0: R0, L0 */
/* The weights are based on vx which is a vector of
*
* - (x + 1), x, - (x + 1), x,
* - (x + ux + 1), x + ux, - (x + ux + 1), x + ux
*
* so the 16 bit weights end up like this:
*
* iw0, w0, iw0, w0, iw1, w1, iw1, w1
*
* and after shifting and packing, we get these bytes:
*
* iw0, w0, iw0, w0, iw1, w1, iw1, w1,
* iw0, w0, iw0, w0, iw1, w1, iw1, w1,
*
* which means the first and the second input pixel
* have to be interleaved like this:
*
* la0, ra0, lr0, rr0, la1, ra1, lr1, rr1,
* lg0, rg0, lb0, rb0, lg1, rg1, lb1, rb1
*
* before maddubsw can be used.
*/
vw = _mm_add_epi16 (
vaddc, _mm_srli_epi16 (vx, 16 - BILINEAR_INTERPOLATION_BITS));
/* vw: iw0, w0, iw0, w0, iw1, w1, iw1, w1
*/
vw = _mm_packus_epi16 (vw, vw);
/* vw: iw0, w0, iw0, w0, iw1, w1, iw1, w1,
* iw0, w0, iw0, w0, iw1, w1, iw1, w1
*/
vx = _mm_add_epi16 (vx, vux);
x += 2 * ux;
vr = _mm_unpacklo_epi16 (vrl1, vrl0);
/* vr: rar0, rar1, rgb0, rgb1, lar0, lar1, lgb0, lgb1 */
s = _mm_shuffle_epi32 (vr, _MM_SHUFFLE (1, 0, 3, 2));
/* s: lar0, lar1, lgb0, lgb1, rar0, rar1, rgb0, rgb1 */
vr = _mm_unpackhi_epi8 (vr, s);
/* vr: la0, ra0, lr0, rr0, la1, ra1, lr1, rr1,
* lg0, rg0, lb0, rb0, lg1, rg1, lb1, rb1
*/
vr = _mm_maddubs_epi16 (vr, vw);
/* When the weight is 0, the inverse weight is
* 128 which can't be represented in a signed byte.
* As a result maddubsw computes the following:
*
* r = l * -128 + r * 0
*
* rather than the desired
*
* r = l * 128 + r * 0
*
* We fix this by taking the absolute value of the
* result.
*/
vr = _mm_abs_epi16 (vr);
/* vr: A0, R0, A1, R1, G0, B0, G1, B1 */
_mm_store_si128 (b++, vr);
}
if (n == -1)
{
vrl1 = _mm_setzero_si128();
goto final_pixel;
}
line->y = y;
}
static uint32_t *
ssse3_fetch_bilinear_cover (pixman_iter_t *iter, const uint32_t *mask)
{
pixman_fixed_t fx, ux;
bilinear_info_t *info = iter->data;
line_t *line0, *line1;
int y0, y1;
int32_t dist_y;
__m128i vw;
int i;
fx = info->x;
ux = iter->image->common.transform->matrix[0][0];
y0 = pixman_fixed_to_int (info->y);
y1 = y0 + 1;
line0 = &info->lines[y0 & 0x01];
line1 = &info->lines[y1 & 0x01];
if (line0->y != y0)
{
ssse3_fetch_horizontal (
&iter->image->bits, line0, y0, fx, ux, iter->width);
}
if (line1->y != y1)
{
ssse3_fetch_horizontal (
&iter->image->bits, line1, y1, fx, ux, iter->width);
}
dist_y = pixman_fixed_to_bilinear_weight (info->y);
dist_y <<= (16 - BILINEAR_INTERPOLATION_BITS);
vw = _mm_set_epi16 (
dist_y, dist_y, dist_y, dist_y, dist_y, dist_y, dist_y, dist_y);
for (i = 0; i + 3 < iter->width; i += 4)
{
__m128i top0 = _mm_load_si128 ((__m128i *)(line0->buffer + i));
__m128i bot0 = _mm_load_si128 ((__m128i *)(line1->buffer + i));
__m128i top1 = _mm_load_si128 ((__m128i *)(line0->buffer + i + 2));
__m128i bot1 = _mm_load_si128 ((__m128i *)(line1->buffer + i + 2));
__m128i r0, r1, tmp, p;
r0 = _mm_mulhi_epu16 (
_mm_sub_epi16 (bot0, top0), vw);
tmp = _mm_cmplt_epi16 (bot0, top0);
tmp = _mm_and_si128 (tmp, vw);
r0 = _mm_sub_epi16 (r0, tmp);
r0 = _mm_add_epi16 (r0, top0);
r0 = _mm_srli_epi16 (r0, BILINEAR_INTERPOLATION_BITS);
/* r0: A0 R0 A1 R1 G0 B0 G1 B1 */
r0 = _mm_shuffle_epi32 (r0, _MM_SHUFFLE (2, 0, 3, 1));
/* r0: A1 R1 G1 B1 A0 R0 G0 B0 */
r1 = _mm_mulhi_epu16 (
_mm_sub_epi16 (bot1, top1), vw);
tmp = _mm_cmplt_epi16 (bot1, top1);
tmp = _mm_and_si128 (tmp, vw);
r1 = _mm_sub_epi16 (r1, tmp);
r1 = _mm_add_epi16 (r1, top1);
r1 = _mm_srli_epi16 (r1, BILINEAR_INTERPOLATION_BITS);
r1 = _mm_shuffle_epi32 (r1, _MM_SHUFFLE (2, 0, 3, 1));
/* r1: A3 R3 G3 B3 A2 R2 G2 B2 */
p = _mm_packus_epi16 (r0, r1);
_mm_storeu_si128 ((__m128i *)(iter->buffer + i), p);
}
while (i < iter->width)
{
__m128i top0 = _mm_load_si128 ((__m128i *)(line0->buffer + i));
__m128i bot0 = _mm_load_si128 ((__m128i *)(line1->buffer + i));
__m128i r0, tmp, p;
r0 = _mm_mulhi_epu16 (
_mm_sub_epi16 (bot0, top0), vw);
tmp = _mm_cmplt_epi16 (bot0, top0);
tmp = _mm_and_si128 (tmp, vw);
r0 = _mm_sub_epi16 (r0, tmp);
r0 = _mm_add_epi16 (r0, top0);
r0 = _mm_srli_epi16 (r0, BILINEAR_INTERPOLATION_BITS);
/* r0: A0 R0 A1 R1 G0 B0 G1 B1 */
r0 = _mm_shuffle_epi32 (r0, _MM_SHUFFLE (2, 0, 3, 1));
/* r0: A1 R1 G1 B1 A0 R0 G0 B0 */
p = _mm_packus_epi16 (r0, r0);
if (iter->width - i == 1)
{
*(uint32_t *)(iter->buffer + i) = _mm_cvtsi128_si32 (p);
i++;
}
else
{
_mm_storel_epi64 ((__m128i *)(iter->buffer + i), p);
i += 2;
}
}
info->y += iter->image->common.transform->matrix[1][1];
return iter->buffer;
}
static void
ssse3_bilinear_cover_iter_fini (pixman_iter_t *iter)
{
free (iter->data);
}
static void
ssse3_bilinear_cover_iter_init (pixman_iter_t *iter, const pixman_iter_info_t *iter_info)
{
int width = iter->width;
bilinear_info_t *info;
pixman_vector_t v;
/* Reference point is the center of the pixel */
v.vector[0] = pixman_int_to_fixed (iter->x) + pixman_fixed_1 / 2;
v.vector[1] = pixman_int_to_fixed (iter->y) + pixman_fixed_1 / 2;
v.vector[2] = pixman_fixed_1;
if (!pixman_transform_point_3d (iter->image->common.transform, &v))
goto fail;
info = malloc (sizeof (*info) + (2 * width - 1) * sizeof (uint64_t) + 64);
if (!info)
goto fail;
info->x = v.vector[0] - pixman_fixed_1 / 2;
info->y = v.vector[1] - pixman_fixed_1 / 2;
#define ALIGN(addr) \
((void *)((((uintptr_t)(addr)) + 15) & (~15)))
/* It is safe to set the y coordinates to -1 initially
* because COVER_CLIP_BILINEAR ensures that we will only
* be asked to fetch lines in the [0, height) interval
*/
info->lines[0].y = -1;
info->lines[0].buffer = ALIGN (&(info->data[0]));
info->lines[1].y = -1;
info->lines[1].buffer = ALIGN (info->lines[0].buffer + width);
iter->get_scanline = ssse3_fetch_bilinear_cover;
iter->fini = ssse3_bilinear_cover_iter_fini;
iter->data = info;
return;
fail:
/* Something went wrong, either a bad matrix or OOM; in such cases,
* we don't guarantee any particular rendering.
*/
_pixman_log_error (
FUNC, "Allocation failure or bad matrix, skipping rendering\n");
iter->get_scanline = _pixman_iter_get_scanline_noop;
iter->fini = NULL;
}
static const pixman_iter_info_t ssse3_iters[] =
{
{ PIXMAN_a8r8g8b8,
(FAST_PATH_STANDARD_FLAGS |
FAST_PATH_SCALE_TRANSFORM |
FAST_PATH_BILINEAR_FILTER |
FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR),
ITER_NARROW | ITER_SRC,
ssse3_bilinear_cover_iter_init,
NULL, NULL
},
{ PIXMAN_null },
};
static const pixman_fast_path_t ssse3_fast_paths[] =
{
{ PIXMAN_OP_NONE },
};
pixman_implementation_t *
_pixman_implementation_create_ssse3 (pixman_implementation_t *fallback)
{
pixman_implementation_t *imp =
_pixman_implementation_create (fallback, ssse3_fast_paths);
imp->iter_info = ssse3_iters;
return imp;
}