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/*
* Copyright © 2013 Soren Sandmann Pedersen
* Copyright © 2013 Red Hat, Inc.
* Copyright © 2016 Mozilla Foundation
*
* 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)
* Jeff Muizelaar (jmuizelaar@mozilla.com)
*/
/* This has been adapted from the ssse3 code from pixman. It's currently
* a mess as I want to try it out in practice before finalizing the details.
*/
#include <stdlib.h>
#include <mmintrin.h>
#include <xmmintrin.h>
#include <emmintrin.h>
#include <tmmintrin.h>
#include <stdint.h>
#include <assert.h>
#include "ssse3-scaler.h"
typedef int32_t pixman_fixed_16_16_t;
typedef pixman_fixed_16_16_t pixman_fixed_t;
#define pixman_fixed_1 (pixman_int_to_fixed(1))
#define pixman_fixed_to_int(f) ((int)((f) >> 16))
#define pixman_int_to_fixed(i) ((pixman_fixed_t)((i) << 16))
#define pixman_double_to_fixed(d) ((pixman_fixed_t)((d)*65536.0))
#define PIXMAN_FIXED_INT_MAX 32767
#define PIXMAN_FIXED_INT_MIN -32768
typedef struct pixman_vector pixman_vector_t;
typedef int pixman_bool_t;
typedef int64_t pixman_fixed_32_32_t;
typedef pixman_fixed_32_32_t pixman_fixed_48_16_t;
typedef struct {
pixman_fixed_48_16_t v[3];
} pixman_vector_48_16_t;
struct pixman_vector {
pixman_fixed_t vector[3];
};
typedef struct pixman_transform pixman_transform_t;
struct pixman_transform {
pixman_fixed_t matrix[3][3];
};
#ifdef _MSC_VER
# define force_inline __forceinline
#else
# define force_inline __inline__ __attribute__((always_inline))
#endif
#define BILINEAR_INTERPOLATION_BITS 6
static force_inline int pixman_fixed_to_bilinear_weight(pixman_fixed_t x) {
return (x >> (16 - BILINEAR_INTERPOLATION_BITS)) &
((1 << BILINEAR_INTERPOLATION_BITS) - 1);
}
static void pixman_transform_point_31_16_3d(const pixman_transform_t* t,
const pixman_vector_48_16_t* v,
pixman_vector_48_16_t* result) {
int i;
int64_t tmp[3][2];
/* input vector values must have no more than 31 bits (including sign)
* in the integer part */
assert(v->v[0] < ((pixman_fixed_48_16_t)1 << (30 + 16)));
assert(v->v[0] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
assert(v->v[1] < ((pixman_fixed_48_16_t)1 << (30 + 16)));
assert(v->v[1] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
assert(v->v[2] < ((pixman_fixed_48_16_t)1 << (30 + 16)));
assert(v->v[2] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
for (i = 0; i < 3; i++) {
tmp[i][0] = (int64_t)t->matrix[i][0] * (v->v[0] >> 16);
tmp[i][1] = (int64_t)t->matrix[i][0] * (v->v[0] & 0xFFFF);
tmp[i][0] += (int64_t)t->matrix[i][1] * (v->v[1] >> 16);
tmp[i][1] += (int64_t)t->matrix[i][1] * (v->v[1] & 0xFFFF);
tmp[i][0] += (int64_t)t->matrix[i][2] * (v->v[2] >> 16);
tmp[i][1] += (int64_t)t->matrix[i][2] * (v->v[2] & 0xFFFF);
}
result->v[0] = tmp[0][0] + ((tmp[0][1] + 0x8000) >> 16);
result->v[1] = tmp[1][0] + ((tmp[1][1] + 0x8000) >> 16);
result->v[2] = tmp[2][0] + ((tmp[2][1] + 0x8000) >> 16);
}
static pixman_bool_t pixman_transform_point_3d(
const struct pixman_transform* transform, struct pixman_vector* vector) {
pixman_vector_48_16_t tmp;
tmp.v[0] = vector->vector[0];
tmp.v[1] = vector->vector[1];
tmp.v[2] = vector->vector[2];
pixman_transform_point_31_16_3d(transform, &tmp, &tmp);
vector->vector[0] = tmp.v[0];
vector->vector[1] = tmp.v[1];
vector->vector[2] = tmp.v[2];
return vector->vector[0] == tmp.v[0] && vector->vector[1] == tmp.v[1] &&
vector->vector[2] == tmp.v[2];
}
struct bits_image_t {
uint32_t* bits;
int rowstride;
pixman_transform_t* transform;
};
typedef struct bits_image_t bits_image_t;
typedef struct {
int unused;
} pixman_iter_info_t;
typedef struct pixman_iter_t pixman_iter_t;
typedef void (*pixman_iter_fini_t)(pixman_iter_t* iter);
struct pixman_iter_t {
int x, y;
pixman_iter_fini_t fini;
bits_image_t* image;
uint32_t* buffer;
int width;
int height;
void* data;
};
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;
#ifdef HACKY_PADDING
if (pixman_fixed_to_int(x + ux) >= image->rowstride) {
vrl1 = _mm_setzero_si128();
printf("overread 2loop\n");
} else {
if (pixman_fixed_to_int(x + ux) < 0) printf("underflow\n");
vrl1 = _mm_loadl_epi64(
(__m128i*)(bits + (pixman_fixed_to_int(x + ux) < 0
? 0
: pixman_fixed_to_int(x + ux))));
}
#else
vrl1 = _mm_loadl_epi64((__m128i*)(bits + pixman_fixed_to_int(x + ux)));
#endif
/* vrl1: R1, L1 */
final_pixel:
#ifdef HACKY_PADDING
vrl0 = _mm_loadl_epi64(
(__m128i*)(bits +
(pixman_fixed_to_int(x) < 0 ? 0 : pixman_fixed_to_int(x))));
#else
vrl0 = _mm_loadl_epi64((__m128i*)(bits + pixman_fixed_to_int(x)));
#endif
/* 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.
*/
// we can drop this if we use lower precision
vr = _mm_shuffle_epi32(vr, _MM_SHUFFLE(2, 0, 3, 1));
/* 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;
}
// scale a line of destination pixels
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, uvw;
int i;
fx = info->x;
ux = iter->image->transform->matrix[0][0];
y0 = pixman_fixed_to_int(info->y);
if (y0 < 0) *(volatile char*)0 = 9;
y1 = y0 + 1;
// clamping in y direction
if (y1 >= iter->height) {
y1 = iter->height - 1;
}
line0 = &info->lines[y0 & 0x01];
line1 = &info->lines[y1 & 0x01];
if (line0->y != y0) {
ssse3_fetch_horizontal(iter->image, line0, y0, fx, ux, iter->width);
}
if (line1->y != y1) {
ssse3_fetch_horizontal(iter->image, line1, y1, fx, ux, iter->width);
}
#ifdef PIXMAN_STYLE_INTERPOLATION
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);
#else
// setup the weights for the top (vw) and bottom (uvw) lines
dist_y = pixman_fixed_to_bilinear_weight(info->y);
// we use 15 instead of 16 because we need an extra bit to handle when the
// weights are 0 and 1
dist_y <<= (15 - BILINEAR_INTERPOLATION_BITS);
vw = _mm_set_epi16(dist_y, dist_y, dist_y, dist_y, dist_y, dist_y, dist_y,
dist_y);
dist_y = (1 << BILINEAR_INTERPOLATION_BITS) -
pixman_fixed_to_bilinear_weight(info->y);
dist_y <<= (15 - BILINEAR_INTERPOLATION_BITS);
uvw = _mm_set_epi16(dist_y, dist_y, dist_y, dist_y, dist_y, dist_y, dist_y,
dist_y);
#endif
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));
#ifdef PIXMAN_STYLE_INTERPOLATION
__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 */
// tmp = bot1 < top1 ? vw : 0;
// r1 = (bot1 - top1)*vw + top1 - tmp
// r1 = bot1*vw - vw*top1 + top1 - tmp
// r1 = bot1*vw + top1 - vw*top1 - tmp
// r1 = bot1*vw + top1*(1 - vw) - tmp
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 */
#else
__m128i r0, r1, p;
top0 = _mm_mulhi_epu16(top0, uvw);
bot0 = _mm_mulhi_epu16(bot0, vw);
r0 = _mm_add_epi16(top0, bot0);
r0 = _mm_srli_epi16(r0, BILINEAR_INTERPOLATION_BITS - 1);
top1 = _mm_mulhi_epu16(top1, uvw);
bot1 = _mm_mulhi_epu16(bot1, vw);
r1 = _mm_add_epi16(top1, bot1);
r1 = _mm_srli_epi16(r1, BILINEAR_INTERPOLATION_BITS - 1);
#endif
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));
#ifdef PIXMAN_STYLE_INTERPOLATION
__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 */
#else
__m128i r0, p;
top0 = _mm_mulhi_epu16(top0, uvw);
bot0 = _mm_mulhi_epu16(bot0, vw);
r0 = _mm_add_epi16(top0, bot0);
r0 = _mm_srli_epi16(r0, BILINEAR_INTERPOLATION_BITS - 1);
#endif
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->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) {
int width = iter->width;
bilinear_info_t* info;
pixman_vector_t v;
if (iter->x > PIXMAN_FIXED_INT_MAX || iter->x < PIXMAN_FIXED_INT_MIN ||
iter->y > PIXMAN_FIXED_INT_MAX || iter->y < PIXMAN_FIXED_INT_MIN)
goto fail;
/* 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->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->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.
*/
iter->fini = NULL;
}
/* scale the src from src_width/height to dest_width/height drawn
* into the rectangle x,y width,height
* src_stride and dst_stride are 4 byte units */
bool ssse3_scale_data(uint32_t* src, int src_width, int src_height,
int src_stride, uint32_t* dest, int dest_width,
int dest_height, int dest_stride, int x, int y, int width,
int height) {
// XXX: assert(src_width > 1)
pixman_transform_t transform = {
{{pixman_fixed_1, 0, 0}, {0, pixman_fixed_1, 0}, {0, 0, pixman_fixed_1}}};
double width_scale = ((double)src_width) / dest_width;
double height_scale = ((double)src_height) / dest_height;
#define AVOID_PADDING
#ifdef AVOID_PADDING
// scale up by enough that we don't read outside of the bounds of the source
// surface currently this is required to avoid reading out of bounds.
if (width_scale < 1) {
width_scale = (double)(src_width - 1) / dest_width;
transform.matrix[0][2] = pixman_fixed_1 / 2;
}
if (height_scale < 1) {
height_scale = (double)(src_height - 1) / dest_height;
transform.matrix[1][2] = pixman_fixed_1 / 2;
}
#endif
transform.matrix[0][0] = pixman_double_to_fixed(width_scale);
transform.matrix[1][1] = pixman_double_to_fixed(height_scale);
transform.matrix[2][2] = pixman_fixed_1;
bits_image_t image;
image.bits = src;
image.transform = &transform;
image.rowstride = src_stride;
pixman_iter_t iter;
iter.image = &image;
iter.x = x;
iter.y = y;
iter.width = width;
iter.height = src_height;
iter.buffer = dest;
iter.data = NULL;
ssse3_bilinear_cover_iter_init(&iter);
if (!iter.fini) return false;
if (iter.data) {
for (int iy = 0; iy < height; iy++) {
ssse3_fetch_bilinear_cover(&iter, NULL);
iter.buffer += dest_stride;
}
ssse3_bilinear_cover_iter_fini(&iter);
}
return true;
}