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blur.rs
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blur.rs
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#pragma version(1)
#pragma rs_fp_inprecise
#pragma rs java_package_name(com.enrique.stackblur)
static unsigned short const stackblur_mul[255] =
{
512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,
454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,
482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,
437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,
497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,
320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,
446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,
329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,
505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,
399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,
324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,
268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,
451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,
385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,
332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,
289,287,285,282,280,278,275,273,271,269,267,265,263,261,259
};
static unsigned char const stackblur_shr[255] =
{
9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24
};
rs_allocation gIn;
uint32_t width;
uint32_t height;
uint32_t radius;
void __attribute__((kernel)) blur_v(uint32_t in) {
uint x, y, xp, yp, i;
uint sp;
uint stack_start;
uchar3* stack_ptr;
uint32_t src_i;
uint32_t dst_i;
uint3 sum;
uint3 sum_in;
uint3 sum_out;
uint3 sum_tmp;
uchar3 inPixel;
uint32_t wm = width - 1;
uint32_t hm = height - 1;
uint32_t div = (radius * 2) + 1;
uint32_t mul_sum = stackblur_mul[radius];
uchar shr_sum = stackblur_shr[radius];
uchar3 stack[div];
x = in;
sum = sum_in = sum_out = 0;
src_i = x; // x,0
for(i = 0; i <= radius; i++)
{
stack_ptr = &stack[i];
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_tmp = convert_uint3(inPixel);
sum += sum_tmp * (i + 1);
sum_out += sum_tmp;
}
for(i = 1; i <= radius; i++)
{
if(i <= hm) src_i += width; // +stride
stack_ptr = &stack[i + radius];
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_tmp = convert_uint3(inPixel);
sum += sum_tmp * (radius + 1 - i);
sum_in += sum_tmp;
}
sp = radius;
yp = radius;
if (yp > hm) yp = hm;
src_i = x + yp * width; // img.pix_ptr(x, yp);
dst_i = x; // img.pix_ptr(x, 0);
for(y = 0; y < height; y++)
{
uchar4 outPixel;
outPixel.xyz = convert_uchar3((sum * mul_sum) >> shr_sum);
outPixel.w = rsGetElementAt_uchar4(gIn, dst_i).w;
outPixel = min(max(outPixel, 0), outPixel.w);
rsSetElementAt_uchar4(gIn, outPixel, dst_i);
dst_i += width;
sum -= sum_out;
stack_start = sp + div - radius;
if(stack_start >= div) stack_start -= div;
stack_ptr = &stack[stack_start];
sum_out -= convert_uint3(*stack_ptr);
if(yp < hm)
{
src_i += width; // stride
++yp;
}
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_in += convert_uint3(inPixel);
sum += sum_in;
++sp;
if (sp >= div) sp = 0;
stack_ptr = &stack[sp];
sum_tmp = convert_uint3(*stack_ptr);
sum_out += sum_tmp;
sum_in -= sum_tmp;
}
}
void __attribute__((kernel)) blur_h(uint32_t in) {
uint x, y, xp, yp, i;
uint sp;
uint stack_start;
uchar3* stack_ptr;
uint32_t src_i;
uint32_t dst_i;
uint3 sum;
uint3 sum_in;
uint3 sum_out;
uint3 sum_tmp;
uchar3 inPixel;
uint32_t wm = width - 1;
uint32_t hm = height - 1;
uint32_t div = (radius * 2) + 1;
uint32_t mul_sum = stackblur_mul[radius];
uchar shr_sum = stackblur_shr[radius];
uchar3 stack[div];
y = in;
sum = sum_in = sum_out = 0;
src_i = width * y; // start of line (0,y)
for(i = 0; i <= radius; i++)
{
stack_ptr = &stack[ i ];
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_tmp = convert_uint3(inPixel);
sum_out += sum_tmp;
sum += sum_tmp * (i + 1);
}
for(i = 1; i <= radius; i++)
{
if (i <= wm) src_i += 1;
stack_ptr = &stack[ (i + radius) ];
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_tmp = convert_uint3(inPixel);
sum += sum_tmp * (radius + 1 - i);
sum_in += sum_tmp;
}
sp = radius;
xp = radius;
if (xp > wm) xp = wm;
src_i = xp + y * width; // img.pix_ptr(xp, y);
dst_i = y * width; // img.pix_ptr(0, y);
for(x = 0; x < width; x++)
{
uchar4 outPixel;
outPixel.xyz = convert_uchar3((sum * mul_sum) >> shr_sum);
outPixel.w = rsGetElementAt_uchar4(gIn, dst_i).w;
outPixel = min(max(outPixel, 0), outPixel.w);
rsSetElementAt_uchar4(gIn, outPixel, dst_i);
dst_i += 1;
sum -= sum_out;
stack_start = sp + div - radius;
if (stack_start >= div) stack_start -= div;
stack_ptr = &stack[stack_start];
sum_out -= convert_uint3(*stack_ptr);
if(xp < wm)
{
src_i += 1;
++xp;
}
inPixel = rsGetElementAt_uchar4(gIn, src_i).xyz;
*stack_ptr = inPixel;
sum_in += convert_uint3(inPixel);
sum += sum_in;
++sp;
if (sp >= div) sp = 0;
stack_ptr = &stack[sp];
sum_out += convert_uint3(*stack_ptr);
sum_in -= convert_uint3(*stack_ptr);
}
}