mirror of
https://github.com/mozilla/gecko-dev.git
synced 2025-11-04 02:09:05 +02:00
cc2040bf21
Done with: ./mach static-analysis check --checks="-*, modernize-concat-nested-namespaces" --fix . and then clang-format on the files Differential Revision: https://phabricator.services.mozilla.com/D58217 --HG-- extra : moz-landing-system : lando
333 lines
13 KiB
C++
333 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "ImageScaling.h"
|
|
#include "mozilla/Attributes.h"
|
|
|
|
#include "SSEHelpers.h"
|
|
|
|
/* The functions below use the following system for averaging 4 pixels:
|
|
*
|
|
* The first observation is that a half-adder is implemented as follows:
|
|
* R = S + 2C or in the case of a and b (a ^ b) + ((a & b) << 1);
|
|
*
|
|
* This can be trivially extended to three pixels by observaring that when
|
|
* doing (a ^ b ^ c) as the sum, the carry is simply the bitwise-or of the
|
|
* carries of the individual numbers, since the sum of 3 bits can only ever
|
|
* have a carry of one.
|
|
*
|
|
* We then observe that the average is then ((carry << 1) + sum) >> 1, or,
|
|
* assuming eliminating overflows and underflows, carry + (sum >> 1).
|
|
*
|
|
* We now average our existing sum with the fourth number, so we get:
|
|
* sum2 = (sum + d) >> 1 or (sum >> 1) + (d >> 1).
|
|
*
|
|
* We now observe that our sum has been moved into place relative to the
|
|
* carry, so we can now average with the carry to get the final 4 input
|
|
* average: avg = (sum2 + carry) >> 1;
|
|
*
|
|
* Or to reverse the proof:
|
|
* avg = ((sum >> 1) + carry + d >> 1) >> 1
|
|
* avg = ((a + b + c) >> 1 + d >> 1) >> 1
|
|
* avg = ((a + b + c + d) >> 2)
|
|
*
|
|
* An additional fact used in the SSE versions is the concept that we can
|
|
* trivially convert a rounded average to a truncated average:
|
|
*
|
|
* We have:
|
|
* f(a, b) = (a + b + 1) >> 1
|
|
*
|
|
* And want:
|
|
* g(a, b) = (a + b) >> 1
|
|
*
|
|
* Observe:
|
|
* ~f(~a, ~b) == ~((~a + ~b + 1) >> 1)
|
|
* == ~((-a - 1 + -b - 1 + 1) >> 1)
|
|
* == ~((-a - 1 + -b) >> 1)
|
|
* == ~((-(a + b) - 1) >> 1)
|
|
* == ~((~(a + b)) >> 1)
|
|
* == (a + b) >> 1
|
|
* == g(a, b)
|
|
*/
|
|
|
|
MOZ_ALWAYS_INLINE __m128i _mm_not_si128(__m128i arg) {
|
|
__m128i minusone = _mm_set1_epi32(0xffffffff);
|
|
return _mm_xor_si128(arg, minusone);
|
|
}
|
|
|
|
/* We have to pass pointers here, MSVC does not allow passing more than 3
|
|
* __m128i arguments on the stack. And it does not allow 16-byte aligned
|
|
* stack variables. This inlines properly on MSVC 2010. It does -not- inline
|
|
* with just the inline directive.
|
|
*/
|
|
MOZ_ALWAYS_INLINE __m128i avg_sse2_8x2(__m128i* a, __m128i* b, __m128i* c,
|
|
__m128i* d) {
|
|
#define shuf1 _MM_SHUFFLE(2, 0, 2, 0)
|
|
#define shuf2 _MM_SHUFFLE(3, 1, 3, 1)
|
|
|
|
// This cannot be an inline function as the __Imm argument to _mm_shuffle_ps
|
|
// needs to be a compile time constant.
|
|
#define shuffle_si128(arga, argb, imm) \
|
|
_mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps((arga)), \
|
|
_mm_castsi128_ps((argb)), (imm)));
|
|
|
|
__m128i t = shuffle_si128(*a, *b, shuf1);
|
|
*b = shuffle_si128(*a, *b, shuf2);
|
|
*a = t;
|
|
t = shuffle_si128(*c, *d, shuf1);
|
|
*d = shuffle_si128(*c, *d, shuf2);
|
|
*c = t;
|
|
|
|
#undef shuf1
|
|
#undef shuf2
|
|
#undef shuffle_si128
|
|
|
|
__m128i sum = _mm_xor_si128(*a, _mm_xor_si128(*b, *c));
|
|
|
|
__m128i carry =
|
|
_mm_or_si128(_mm_and_si128(*a, *b),
|
|
_mm_or_si128(_mm_and_si128(*a, *c), _mm_and_si128(*b, *c)));
|
|
|
|
sum = _mm_avg_epu8(_mm_not_si128(sum), _mm_not_si128(*d));
|
|
|
|
return _mm_not_si128(_mm_avg_epu8(sum, _mm_not_si128(carry)));
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE __m128i avg_sse2_4x2_4x1(__m128i a, __m128i b) {
|
|
return _mm_not_si128(_mm_avg_epu8(_mm_not_si128(a), _mm_not_si128(b)));
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE __m128i avg_sse2_8x1_4x1(__m128i a, __m128i b) {
|
|
__m128i t = _mm_castps_si128(_mm_shuffle_ps(
|
|
_mm_castsi128_ps(a), _mm_castsi128_ps(b), _MM_SHUFFLE(3, 1, 3, 1)));
|
|
b = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(a), _mm_castsi128_ps(b),
|
|
_MM_SHUFFLE(2, 0, 2, 0)));
|
|
a = t;
|
|
|
|
return _mm_not_si128(_mm_avg_epu8(_mm_not_si128(a), _mm_not_si128(b)));
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE uint32_t Avg2x2(uint32_t a, uint32_t b, uint32_t c,
|
|
uint32_t d) {
|
|
uint32_t sum = a ^ b ^ c;
|
|
uint32_t carry = (a & b) | (a & c) | (b & c);
|
|
|
|
uint32_t mask = 0xfefefefe;
|
|
|
|
// Not having a byte based average instruction means we should mask to avoid
|
|
// underflow.
|
|
sum = (((sum ^ d) & mask) >> 1) + (sum & d);
|
|
|
|
return (((sum ^ carry) & mask) >> 1) + (sum & carry);
|
|
}
|
|
|
|
// Simple 2 pixel average version of the function above.
|
|
MOZ_ALWAYS_INLINE uint32_t Avg2(uint32_t a, uint32_t b) {
|
|
uint32_t sum = a ^ b;
|
|
uint32_t carry = (a & b);
|
|
|
|
uint32_t mask = 0xfefefefe;
|
|
|
|
return ((sum & mask) >> 1) + carry;
|
|
}
|
|
|
|
namespace mozilla::gfx {
|
|
|
|
void ImageHalfScaler::HalfImage2D_SSE2(uint8_t* aSource, int32_t aSourceStride,
|
|
const IntSize& aSourceSize,
|
|
uint8_t* aDest, uint32_t aDestStride) {
|
|
const int Bpp = 4;
|
|
|
|
for (int y = 0; y < aSourceSize.height; y += 2) {
|
|
__m128i* storage = (__m128i*)(aDest + (y / 2) * aDestStride);
|
|
int x = 0;
|
|
// Run a loop depending on alignment.
|
|
if (!(uintptr_t(aSource + (y * aSourceStride)) % 16) &&
|
|
!(uintptr_t(aSource + ((y + 1) * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* upperRow = (__m128i*)(aSource + (y * aSourceStride + x * Bpp));
|
|
__m128i* lowerRow =
|
|
(__m128i*)(aSource + ((y + 1) * aSourceStride + x * Bpp));
|
|
|
|
__m128i a = _mm_load_si128(upperRow);
|
|
__m128i b = _mm_load_si128(upperRow + 1);
|
|
__m128i c = _mm_load_si128(lowerRow);
|
|
__m128i d = _mm_load_si128(lowerRow + 1);
|
|
|
|
*storage++ = avg_sse2_8x2(&a, &b, &c, &d);
|
|
}
|
|
} else if (!(uintptr_t(aSource + (y * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* upperRow = (__m128i*)(aSource + (y * aSourceStride + x * Bpp));
|
|
__m128i* lowerRow =
|
|
(__m128i*)(aSource + ((y + 1) * aSourceStride + x * Bpp));
|
|
|
|
__m128i a = _mm_load_si128(upperRow);
|
|
__m128i b = _mm_load_si128(upperRow + 1);
|
|
__m128i c = loadUnaligned128(lowerRow);
|
|
__m128i d = loadUnaligned128(lowerRow + 1);
|
|
|
|
*storage++ = avg_sse2_8x2(&a, &b, &c, &d);
|
|
}
|
|
} else if (!(uintptr_t(aSource + ((y + 1) * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* upperRow = (__m128i*)(aSource + (y * aSourceStride + x * Bpp));
|
|
__m128i* lowerRow =
|
|
(__m128i*)(aSource + ((y + 1) * aSourceStride + x * Bpp));
|
|
|
|
__m128i a = loadUnaligned128((__m128i*)upperRow);
|
|
__m128i b = loadUnaligned128((__m128i*)upperRow + 1);
|
|
__m128i c = _mm_load_si128((__m128i*)lowerRow);
|
|
__m128i d = _mm_load_si128((__m128i*)lowerRow + 1);
|
|
|
|
*storage++ = avg_sse2_8x2(&a, &b, &c, &d);
|
|
}
|
|
} else {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* upperRow = (__m128i*)(aSource + (y * aSourceStride + x * Bpp));
|
|
__m128i* lowerRow =
|
|
(__m128i*)(aSource + ((y + 1) * aSourceStride + x * Bpp));
|
|
|
|
__m128i a = loadUnaligned128(upperRow);
|
|
__m128i b = loadUnaligned128(upperRow + 1);
|
|
__m128i c = loadUnaligned128(lowerRow);
|
|
__m128i d = loadUnaligned128(lowerRow + 1);
|
|
|
|
*storage++ = avg_sse2_8x2(&a, &b, &c, &d);
|
|
}
|
|
}
|
|
|
|
uint32_t* unalignedStorage = (uint32_t*)storage;
|
|
// Take care of the final pixels, we know there's an even number of pixels
|
|
// in the source rectangle. We use a 2x2 'simd' implementation for this.
|
|
//
|
|
// Potentially we only have to do this in the last row since overflowing
|
|
// 8 pixels in an earlier row would appear to be harmless as it doesn't
|
|
// touch invalid memory. Even when reading and writing to the same surface.
|
|
// in practice we only do this when doing an additional downscale pass, and
|
|
// in this situation we have unused stride to write into harmlessly.
|
|
// I do not believe the additional code complexity would be worth it though.
|
|
for (; x < aSourceSize.width; x += 2) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * Bpp);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * Bpp);
|
|
|
|
*unalignedStorage++ =
|
|
Avg2x2(*(uint32_t*)upperRow, *((uint32_t*)upperRow + 1),
|
|
*(uint32_t*)lowerRow, *((uint32_t*)lowerRow + 1));
|
|
}
|
|
}
|
|
}
|
|
|
|
void ImageHalfScaler::HalfImageVertical_SSE2(uint8_t* aSource,
|
|
int32_t aSourceStride,
|
|
const IntSize& aSourceSize,
|
|
uint8_t* aDest,
|
|
uint32_t aDestStride) {
|
|
for (int y = 0; y < aSourceSize.height; y += 2) {
|
|
__m128i* storage = (__m128i*)(aDest + (y / 2) * aDestStride);
|
|
int x = 0;
|
|
// Run a loop depending on alignment.
|
|
if (!(uintptr_t(aSource + (y * aSourceStride)) % 16) &&
|
|
!(uintptr_t(aSource + ((y + 1) * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 3); x += 4) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * 4);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * 4);
|
|
|
|
__m128i a = _mm_load_si128((__m128i*)upperRow);
|
|
__m128i b = _mm_load_si128((__m128i*)lowerRow);
|
|
|
|
*storage++ = avg_sse2_4x2_4x1(a, b);
|
|
}
|
|
} else if (!(uintptr_t(aSource + (y * aSourceStride)) % 16)) {
|
|
// This line doesn't align well.
|
|
for (; x < (aSourceSize.width - 3); x += 4) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * 4);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * 4);
|
|
|
|
__m128i a = _mm_load_si128((__m128i*)upperRow);
|
|
__m128i b = loadUnaligned128((__m128i*)lowerRow);
|
|
|
|
*storage++ = avg_sse2_4x2_4x1(a, b);
|
|
}
|
|
} else if (!(uintptr_t(aSource + ((y + 1) * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 3); x += 4) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * 4);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * 4);
|
|
|
|
__m128i a = loadUnaligned128((__m128i*)upperRow);
|
|
__m128i b = _mm_load_si128((__m128i*)lowerRow);
|
|
|
|
*storage++ = avg_sse2_4x2_4x1(a, b);
|
|
}
|
|
} else {
|
|
for (; x < (aSourceSize.width - 3); x += 4) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * 4);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * 4);
|
|
|
|
__m128i a = loadUnaligned128((__m128i*)upperRow);
|
|
__m128i b = loadUnaligned128((__m128i*)lowerRow);
|
|
|
|
*storage++ = avg_sse2_4x2_4x1(a, b);
|
|
}
|
|
}
|
|
|
|
uint32_t* unalignedStorage = (uint32_t*)storage;
|
|
// Take care of the final pixels, we know there's an even number of pixels
|
|
// in the source rectangle.
|
|
//
|
|
// Similar overflow considerations are valid as in the previous function.
|
|
for (; x < aSourceSize.width; x++) {
|
|
uint8_t* upperRow = aSource + (y * aSourceStride + x * 4);
|
|
uint8_t* lowerRow = aSource + ((y + 1) * aSourceStride + x * 4);
|
|
|
|
*unalignedStorage++ = Avg2(*(uint32_t*)upperRow, *(uint32_t*)lowerRow);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ImageHalfScaler::HalfImageHorizontal_SSE2(uint8_t* aSource,
|
|
int32_t aSourceStride,
|
|
const IntSize& aSourceSize,
|
|
uint8_t* aDest,
|
|
uint32_t aDestStride) {
|
|
for (int y = 0; y < aSourceSize.height; y++) {
|
|
__m128i* storage = (__m128i*)(aDest + (y * aDestStride));
|
|
int x = 0;
|
|
// Run a loop depending on alignment.
|
|
if (!(uintptr_t(aSource + (y * aSourceStride)) % 16)) {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* pixels = (__m128i*)(aSource + (y * aSourceStride + x * 4));
|
|
|
|
__m128i a = _mm_load_si128(pixels);
|
|
__m128i b = _mm_load_si128(pixels + 1);
|
|
|
|
*storage++ = avg_sse2_8x1_4x1(a, b);
|
|
}
|
|
} else {
|
|
for (; x < (aSourceSize.width - 7); x += 8) {
|
|
__m128i* pixels = (__m128i*)(aSource + (y * aSourceStride + x * 4));
|
|
|
|
__m128i a = loadUnaligned128(pixels);
|
|
__m128i b = loadUnaligned128(pixels + 1);
|
|
|
|
*storage++ = avg_sse2_8x1_4x1(a, b);
|
|
}
|
|
}
|
|
|
|
uint32_t* unalignedStorage = (uint32_t*)storage;
|
|
// Take care of the final pixels, we know there's an even number of pixels
|
|
// in the source rectangle.
|
|
//
|
|
// Similar overflow considerations are valid as in the previous function.
|
|
for (; x < aSourceSize.width; x += 2) {
|
|
uint32_t* pixels = (uint32_t*)(aSource + (y * aSourceStride + x * 4));
|
|
|
|
*unalignedStorage++ = Avg2(*pixels, *(pixels + 1));
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace mozilla::gfx
|