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OB-Xd/Modules/gin/images/imageeffects_stackblur.cpp

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/*==============================================================================
Copyright 2018 by Roland Rabien
For more information visit www.rabiensoftware.com
==============================================================================*/
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
};
static void applyStackBlurBW (Image& img, unsigned int radius)
{
const unsigned int w = (unsigned int)img.getWidth();
const unsigned int h = (unsigned int)img.getHeight();
Image::BitmapData data (img, Image::BitmapData::readWrite);
radius = jlimit (2u, 254u, radius);
unsigned char stack[(254 * 2 + 1) * 1];
unsigned int x, y, xp, yp, i, sp, stack_start;
unsigned char* stack_ptr = nullptr;
unsigned char* src_ptr = nullptr;
unsigned char* dst_ptr = nullptr;
unsigned long sum, sum_in, sum_out;
unsigned int wm = w - 1;
unsigned int hm = h - 1;
unsigned int w1 = (unsigned int) data.lineStride;
unsigned int div = (unsigned int) (radius * 2) + 1;
unsigned int mul_sum = stackblur_mul[radius];
unsigned char shr_sum = stackblur_shr[radius];
for (y = 0; y < h; ++y)
{
sum = sum_in = sum_out = 0;
src_ptr = data.getLinePointer (int (y));
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[i];
stack_ptr[0] = src_ptr[0];
sum += src_ptr[0] * (i + 1);
sum_out += src_ptr[0];
}
for (i = 1; i <= radius; ++i)
{
if (i <= wm)
src_ptr += 1;
stack_ptr = &stack[1 * (i + radius)];
stack_ptr[0] = src_ptr[0];
sum += src_ptr[0] * (radius + 1 - i);
sum_in += src_ptr[0];
}
sp = radius;
xp = radius;
if (xp > wm)
xp = wm;
src_ptr = data.getLinePointer (int (y)) + (unsigned int)data.pixelStride * xp;
dst_ptr = data.getLinePointer (int (y));
for (x = 0; x < w; ++x)
{
dst_ptr[0] = (unsigned char)((sum * mul_sum) >> shr_sum);
dst_ptr += 1;
sum -= sum_out;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[1 * stack_start];
sum_out -= stack_ptr[0];
if (xp < wm)
{
src_ptr += 1;
++xp;
}
stack_ptr[0] = src_ptr[0];
sum_in += src_ptr[0];
sum += sum_in;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp*1];
sum_out += stack_ptr[0];
sum_in -= stack_ptr[0];
}
}
for (x = 0; x < w; ++x)
{
sum = sum_in = sum_out = 0;
src_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[i * 1];
stack_ptr[0] = src_ptr[0];
sum += src_ptr[0] * (i + 1);
sum_out += src_ptr[0];
}
for (i = 1; i <= radius; ++i)
{
if (i <= hm)
src_ptr += w1;
stack_ptr = &stack[1 * (i + radius)];
stack_ptr[0] = src_ptr[0];
sum += src_ptr[0] * (radius + 1 - i);
sum_in += src_ptr[0];
}
sp = radius;
yp = radius;
if (yp > hm)
yp = hm;
src_ptr = data.getLinePointer (int (yp)) + (unsigned int)data.pixelStride * x;
dst_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (y = 0; y < h; ++y)
{
dst_ptr[0] = (unsigned char)((sum * mul_sum) >> shr_sum);
dst_ptr += w1;
sum -= sum_out;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[1 * stack_start];
sum_out -= stack_ptr[0];
if (yp < hm)
{
src_ptr += w1;
++yp;
}
stack_ptr[0] = src_ptr[0];
sum_in += src_ptr[0];
sum += sum_in;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp * 1];
sum_out += stack_ptr[0];
sum_in -= stack_ptr[0];
}
}
}
static void applyStackBlurRGB (Image& img, unsigned int radius)
{
const unsigned int w = (unsigned int)img.getWidth();
const unsigned int h = (unsigned int)img.getHeight();
Image::BitmapData data (img, Image::BitmapData::readWrite);
radius = jlimit (2u, 254u, radius);
unsigned char stack[(254 * 2 + 1) * 3];
unsigned int x, y, xp, yp, i, sp, stack_start;
unsigned char* stack_ptr = nullptr;
unsigned char* src_ptr = nullptr;
unsigned char* dst_ptr = nullptr;
unsigned long sum_r, sum_g, sum_b, sum_in_r, sum_in_g, sum_in_b,
sum_out_r, sum_out_g, sum_out_b;
unsigned int wm = w - 1;
unsigned int hm = h - 1;
unsigned int w3 = (unsigned int) data.lineStride;
unsigned int div = (unsigned int)(radius * 2) + 1;
unsigned int mul_sum = stackblur_mul[radius];
unsigned char shr_sum = stackblur_shr[radius];
for (y = 0; y < h; ++y)
{
sum_r = sum_g = sum_b =
sum_in_r = sum_in_g = sum_in_b =
sum_out_r = sum_out_g = sum_out_b = 0;
src_ptr = data.getLinePointer (int (y));
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[3 * i];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_r += src_ptr[0] * (i + 1);
sum_g += src_ptr[1] * (i + 1);
sum_b += src_ptr[2] * (i + 1);
sum_out_r += src_ptr[0];
sum_out_g += src_ptr[1];
sum_out_b += src_ptr[2];
}
for (i = 1; i <= radius; ++i)
{
if (i <= wm)
src_ptr += 3;
stack_ptr = &stack[3 * (i + radius)];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_g += src_ptr[1] * (radius + 1 - i);
sum_b += src_ptr[2] * (radius + 1 - i);
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
}
sp = radius;
xp = radius;
if (xp > wm)
xp = wm;
src_ptr = data.getLinePointer (int (y)) + (unsigned int)data.pixelStride * xp;
dst_ptr = data.getLinePointer (int (y));
for (x = 0; x < w; ++x)
{
dst_ptr[0] = (unsigned char)((sum_r * mul_sum) >> shr_sum);
dst_ptr[1] = (unsigned char)((sum_g * mul_sum) >> shr_sum);
dst_ptr[2] = (unsigned char)((sum_b * mul_sum) >> shr_sum);
dst_ptr += 3;
sum_r -= sum_out_r;
sum_g -= sum_out_g;
sum_b -= sum_out_b;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[3 * stack_start];
sum_out_r -= stack_ptr[0];
sum_out_g -= stack_ptr[1];
sum_out_b -= stack_ptr[2];
if (xp < wm)
{
src_ptr += 3;
++xp;
}
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_r += sum_in_r;
sum_g += sum_in_g;
sum_b += sum_in_b;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp*3];
sum_out_r += stack_ptr[0];
sum_out_g += stack_ptr[1];
sum_out_b += stack_ptr[2];
sum_in_r -= stack_ptr[0];
sum_in_g -= stack_ptr[1];
sum_in_b -= stack_ptr[2];
}
}
for (x = 0; x < w; ++x)
{
sum_r = sum_g = sum_b =
sum_in_r = sum_in_g = sum_in_b =
sum_out_r = sum_out_g = sum_out_b = 0;
src_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[i * 3];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_r += src_ptr[0] * (i + 1);
sum_g += src_ptr[1] * (i + 1);
sum_b += src_ptr[2] * (i + 1);
sum_out_r += src_ptr[0];
sum_out_g += src_ptr[1];
sum_out_b += src_ptr[2];
}
for (i = 1; i <= radius; ++i)
{
if (i <= hm)
src_ptr += w3;
stack_ptr = &stack[3 * (i + radius)];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_g += src_ptr[1] * (radius + 1 - i);
sum_b += src_ptr[2] * (radius + 1 - i);
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
}
sp = radius;
yp = radius;
if (yp > hm)
yp = hm;
src_ptr = data.getLinePointer (int (yp)) + (unsigned int)data.pixelStride * x;
dst_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (y = 0; y < h; ++y)
{
dst_ptr[0] = (unsigned char)((sum_r * mul_sum) >> shr_sum);
dst_ptr[1] = (unsigned char)((sum_g * mul_sum) >> shr_sum);
dst_ptr[2] = (unsigned char)((sum_b * mul_sum) >> shr_sum);
dst_ptr += w3;
sum_r -= sum_out_r;
sum_g -= sum_out_g;
sum_b -= sum_out_b;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[3 * stack_start];
sum_out_r -= stack_ptr[0];
sum_out_g -= stack_ptr[1];
sum_out_b -= stack_ptr[2];
if (yp < hm)
{
src_ptr += w3;
++yp;
}
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_r += sum_in_r;
sum_g += sum_in_g;
sum_b += sum_in_b;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp * 3];
sum_out_r += stack_ptr[0];
sum_out_g += stack_ptr[1];
sum_out_b += stack_ptr[2];
sum_in_r -= stack_ptr[0];
sum_in_g -= stack_ptr[1];
sum_in_b -= stack_ptr[2];
}
}
}
static void applyStackBlurARGB (Image& img, unsigned int radius)
{
const unsigned int w = (unsigned int)img.getWidth();
const unsigned int h = (unsigned int)img.getHeight();
Image::BitmapData data (img, Image::BitmapData::readWrite);
radius = jlimit (2u, 254u, radius);
unsigned char stack[(254 * 2 + 1) * 4];
unsigned int x, y, xp, yp, i, sp, stack_start;
unsigned char* stack_ptr = nullptr;
unsigned char* src_ptr = nullptr;
unsigned char* dst_ptr = nullptr;
unsigned long sum_r, sum_g, sum_b, sum_a, sum_in_r, sum_in_g, sum_in_b, sum_in_a,
sum_out_r, sum_out_g, sum_out_b, sum_out_a;
unsigned int wm = w - 1;
unsigned int hm = h - 1;
unsigned int w4 = (unsigned int) data.lineStride;
unsigned int div = (unsigned int)(radius * 2) + 1;
unsigned int mul_sum = stackblur_mul[radius];
unsigned char shr_sum = stackblur_shr[radius];
for (y = 0; y < h; ++y)
{
sum_r = sum_g = sum_b = sum_a =
sum_in_r = sum_in_g = sum_in_b = sum_in_a =
sum_out_r = sum_out_g = sum_out_b = sum_out_a = 0;
src_ptr = data.getLinePointer (int (y));
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[4 * i];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_r += src_ptr[0] * (i + 1);
sum_g += src_ptr[1] * (i + 1);
sum_b += src_ptr[2] * (i + 1);
sum_a += src_ptr[3] * (i + 1);
sum_out_r += src_ptr[0];
sum_out_g += src_ptr[1];
sum_out_b += src_ptr[2];
sum_out_a += src_ptr[3];
}
for (i = 1; i <= radius; ++i)
{
if (i <= wm)
src_ptr += 4;
stack_ptr = &stack[4 * (i + radius)];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_g += src_ptr[1] * (radius + 1 - i);
sum_b += src_ptr[2] * (radius + 1 - i);
sum_a += src_ptr[3] * (radius + 1 - i);
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_in_a += src_ptr[3];
}
sp = radius;
xp = radius;
if (xp > wm)
xp = wm;
src_ptr = data.getLinePointer (int (y)) + (unsigned int)data.pixelStride * xp;
dst_ptr = data.getLinePointer (int (y));
for (x = 0; x < w; ++x)
{
dst_ptr[0] = (unsigned char)((sum_r * mul_sum) >> shr_sum);
dst_ptr[1] = (unsigned char)((sum_g * mul_sum) >> shr_sum);
dst_ptr[2] = (unsigned char)((sum_b * mul_sum) >> shr_sum);
dst_ptr[3] = (unsigned char)((sum_a * mul_sum) >> shr_sum);
dst_ptr += 4;
sum_r -= sum_out_r;
sum_g -= sum_out_g;
sum_b -= sum_out_b;
sum_a -= sum_out_a;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[4 * stack_start];
sum_out_r -= stack_ptr[0];
sum_out_g -= stack_ptr[1];
sum_out_b -= stack_ptr[2];
sum_out_a -= stack_ptr[3];
if (xp < wm)
{
src_ptr += 4;
++xp;
}
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_in_a += src_ptr[3];
sum_r += sum_in_r;
sum_g += sum_in_g;
sum_b += sum_in_b;
sum_a += sum_in_a;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp*4];
sum_out_r += stack_ptr[0];
sum_out_g += stack_ptr[1];
sum_out_b += stack_ptr[2];
sum_out_a += stack_ptr[3];
sum_in_r -= stack_ptr[0];
sum_in_g -= stack_ptr[1];
sum_in_b -= stack_ptr[2];
sum_in_a -= stack_ptr[3];
}
}
for (x = 0; x < w; ++x)
{
sum_r = sum_g = sum_b = sum_a =
sum_in_r = sum_in_g = sum_in_b = sum_in_a =
sum_out_r = sum_out_g = sum_out_b = sum_out_a = 0;
src_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (i = 0; i <= radius; ++i)
{
stack_ptr = &stack[i * 4];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_r += src_ptr[0] * (i + 1);
sum_g += src_ptr[1] * (i + 1);
sum_b += src_ptr[2] * (i + 1);
sum_a += src_ptr[3] * (i + 1);
sum_out_r += src_ptr[0];
sum_out_g += src_ptr[1];
sum_out_b += src_ptr[2];
sum_out_a += src_ptr[3];
}
for (i = 1; i <= radius; ++i)
{
if (i <= hm)
src_ptr += w4;
stack_ptr = &stack[4 * (i + radius)];
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_g += src_ptr[1] * (radius + 1 - i);
sum_b += src_ptr[2] * (radius + 1 - i);
sum_a += src_ptr[3] * (radius + 1 - i);
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_in_a += src_ptr[3];
}
sp = radius;
yp = radius;
if (yp > hm)
yp = hm;
src_ptr = data.getLinePointer (int (yp)) + (unsigned int)data.pixelStride * x;
dst_ptr = data.getLinePointer (0) + (unsigned int)data.pixelStride * x;
for (y = 0; y < h; ++y)
{
dst_ptr[0] = (unsigned char)((sum_r * mul_sum) >> shr_sum);
dst_ptr[1] = (unsigned char)((sum_g * mul_sum) >> shr_sum);
dst_ptr[2] = (unsigned char)((sum_b * mul_sum) >> shr_sum);
dst_ptr[3] = (unsigned char)((sum_a * mul_sum) >> shr_sum);
dst_ptr += w4;
sum_r -= sum_out_r;
sum_g -= sum_out_g;
sum_b -= sum_out_b;
sum_a -= sum_out_a;
stack_start = sp + div - radius;
if (stack_start >= div)
stack_start -= div;
stack_ptr = &stack[4 * stack_start];
sum_out_r -= stack_ptr[0];
sum_out_g -= stack_ptr[1];
sum_out_b -= stack_ptr[2];
sum_out_a -= stack_ptr[3];
if (yp < hm)
{
src_ptr += w4;
++yp;
}
stack_ptr[0] = src_ptr[0];
stack_ptr[1] = src_ptr[1];
stack_ptr[2] = src_ptr[2];
stack_ptr[3] = src_ptr[3];
sum_in_r += src_ptr[0];
sum_in_g += src_ptr[1];
sum_in_b += src_ptr[2];
sum_in_a += src_ptr[3];
sum_r += sum_in_r;
sum_g += sum_in_g;
sum_b += sum_in_b;
sum_a += sum_in_a;
++sp;
if (sp >= div)
sp = 0;
stack_ptr = &stack[sp * 4];
sum_out_r += stack_ptr[0];
sum_out_g += stack_ptr[1];
sum_out_b += stack_ptr[2];
sum_out_a += stack_ptr[3];
sum_in_r -= stack_ptr[0];
sum_in_g -= stack_ptr[1];
sum_in_b -= stack_ptr[2];
sum_in_a -= stack_ptr[3];
}
}
}
// The Stack Blur Algorithm was invented by Mario Klingemann,
// mario@quasimondo.com and described here:
// http://incubator.quasimondo.com/processing/fast_blur_deluxe.php
// Stackblur algorithm by Mario Klingemann
// Details here:
// http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
// C++ implemenation base from:
// https://gist.github.com/benjamin9999/3809142
// http://www.antigrain.com/__code/include/agg_blur.h.html
void applyStackBlur (Image& img, int radius)
{
if (img.getFormat() == Image::ARGB) applyStackBlurARGB (img, (unsigned int)radius);
if (img.getFormat() == Image::RGB) applyStackBlurRGB (img, (unsigned int)radius);
if (img.getFormat() == Image::SingleChannel) applyStackBlurBW (img, (unsigned int)radius);
}
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