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Extend kernel size to 15x15.

master
Sebastian Frysztak 8 years ago
parent
a48ddb61db
commit
afe41c5754
2 changed files with 32 additions and 25 deletions
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  1. 2
      blur.c
  2. 55
      blur_simd.c

2
blur.c
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@ -70,7 +70,7 @@ blur_image_surface (cairo_surface_t *surface, int radius)
dst_stride = cairo_image_surface_get_stride (tmp);
//blur_impl_naive(src, dst, width, height, src_stride, dst_stride, 10000);
blur_impl_sse2(src, dst, width, height, 2.5);
blur_impl_sse2(src, dst, width, height, 4.5);
cairo_surface_destroy (tmp);
cairo_surface_flush (surface);

55
blur_simd.c
View File

@ -12,9 +12,13 @@
#include <xmmintrin.h>
#define ALIGN16 __attribute__((aligned(16)))
#define KERNEL_SIZE 7
#define KERNEL_SIZE 15
#define HALF_KERNEL KERNEL_SIZE / 2
// number of xmm registers needed to store
// input pixels for given kernel size
#define REGISTERS_CNT (KERNEL_SIZE + 4/2) / 4
void blur_impl_sse2(uint32_t *src, uint32_t *dst, int width, int height, float sigma) {
// prepare kernel
float kernel[KERNEL_SIZE];
@ -46,34 +50,34 @@ void blur_impl_horizontal_pass_sse2(uint32_t *src, uint32_t *dst, float *kernel,
uint32_t lastPixel = *(src + width - 1);
for (int column = 0; column < width; column++, src++) {
__m128i rgbaIn1, rgbaIn2;
__m128i rgbaIn[REGISTERS_CNT];
// handle borders
int leftBorder = column < HALF_KERNEL;
int rightBorder = column + HALF_KERNEL >= width;
if (leftBorder || rightBorder) {
uint32_t rgbaIn[KERNEL_SIZE] ALIGN16;
uint32_t _rgbaIn[KERNEL_SIZE] ALIGN16;
int i = 0;
if (leftBorder) {
// for kernel size 7x7 and column == 0, we have:
// x x x P0 P1 P2 P3
// first loop fills x's with P0, second one loads P{0..3}
for (; i < HALF_KERNEL - column; i++)
rgbaIn[i] = firstPixel;
_rgbaIn[i] = firstPixel;
for (; i < KERNEL_SIZE; i++)
rgbaIn[i] = *(src + i - HALF_KERNEL);
_rgbaIn[i] = *(src + i - HALF_KERNEL);
} else {
for (; width < column; i++)
rgbaIn[i] = *(src - i - HALF_KERNEL);
_rgbaIn[i] = *(src - i - HALF_KERNEL);
for (; i < KERNEL_SIZE; i++)
rgbaIn[i] = lastPixel;
_rgbaIn[i] = lastPixel;
}
rgbaIn1 = _mm_load_si128((__m128i *)(rgbaIn));
rgbaIn2 = _mm_load_si128((__m128i *)(rgbaIn + 4));
for (int k = 0; k < REGISTERS_CNT; k++)
rgbaIn[k] = _mm_load_si128((__m128i*)(_rgbaIn + 4*k));
} else {
rgbaIn1 = _mm_loadu_si128((__m128i *)(src - 3));
rgbaIn2 = _mm_loadu_si128((__m128i *)(src + 1));
for (int k = 0; k < REGISTERS_CNT; k++)
rgbaIn[k] = _mm_loadu_si128((__m128i*)(src + 4*k - HALF_KERNEL));
}
// unpack each pixel, convert to float,
@ -85,25 +89,28 @@ void blur_impl_horizontal_pass_sse2(uint32_t *src, uint32_t *dst, float *kernel,
__m128 acc = _mm_setzero_ps();
int counter = 0;
tmp = _mm_unpacklo_epi8(rgbaIn1, zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
tmp = _mm_unpackhi_epi8(rgbaIn1, zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
for (int i = 0; i < 3; i++)
{
tmp = _mm_unpacklo_epi8(rgbaIn[i], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
tmp = _mm_unpackhi_epi8(rgbaIn[i], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
}
tmp = _mm_unpacklo_epi8(rgbaIn2, zero);
tmp = _mm_unpacklo_epi8(rgbaIn[3], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
rgba_ps = _mm_cvtepi32_ps(_mm_unpackhi_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));
tmp = _mm_unpackhi_epi8(rgbaIn2, zero);
tmp = _mm_unpackhi_epi8(rgbaIn[3], zero);
rgba_ps = _mm_cvtepi32_ps(_mm_unpacklo_epi16(tmp, zero));
acc = _mm_add_ps(acc, _mm_mul_ps(rgba_ps, _mm_set1_ps(kernel[counter++])));

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