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i3lock-color
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Improve border handling for larger kernels.

This commit is contained in:
Sebastian Frysztak 2016-10-28 17:36:43 +02:00
parent afe41c5754
commit 3662b8e187
1 changed files with 9 additions and 13 deletions
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22
blur_simd.c
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@ -44,33 +44,29 @@ void blur_impl_sse2(uint32_t *src, uint32_t *dst, int width, int height, float s
void blur_impl_horizontal_pass_sse2(uint32_t *src, uint32_t *dst, float *kernel, int width, int height) {
for (int row = 0; row < height; row++) {
// remember first and last pixel in a row
// (used to handle borders)
uint32_t firstPixel = *src;
uint32_t lastPixel = *(src + width - 1);
for (int column = 0; column < width; column++, src++) {
__m128i rgbaIn[REGISTERS_CNT];
// handle borders
int leftBorder = column < HALF_KERNEL;
int rightBorder = column + HALF_KERNEL >= width;
int rightBorder = column > width - HALF_KERNEL;
if (leftBorder || rightBorder) {
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}
// first loop mirrors P{0..3} to fill x's,
// second one loads P{0..3}
for (; i < HALF_KERNEL - column; i++)
_rgbaIn[i] = firstPixel;
_rgbaIn[i] = *(src + (HALF_KERNEL - i));
for (; i < KERNEL_SIZE; i++)
_rgbaIn[i] = *(src + i - HALF_KERNEL);
_rgbaIn[i] = *(src - (HALF_KERNEL - i));
} else {
for (; width < column; i++)
_rgbaIn[i] = *(src - i - HALF_KERNEL);
for (; i < KERNEL_SIZE; i++)
_rgbaIn[i] = lastPixel;
for (; i < width - column; i++)
_rgbaIn[i] = *(src + i);
for (int k = 0; i < KERNEL_SIZE; i++, k++)
_rgbaIn[i] = *(src - k);
}
for (int k = 0; k < REGISTERS_CNT; k++)