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esimov
357
stackblur.go
Normal file
357
stackblur.go
Normal file
@@ -0,0 +1,357 @@
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// Go implementation of StackBlur algorithm described here:
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// http://incubator.quasimondo.com/processing/fast_blur_deluxe.php
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package caire
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import (
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"image"
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)
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type blurstack struct {
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r, g, b, a uint32
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next *blurstack
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}
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var mul_table []uint32 = []uint32{
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512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512,
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454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292, 273, 512,
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482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456,
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437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292, 282, 273, 265, 512,
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497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328,
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320, 312, 305, 298, 291, 284, 278, 271, 265, 259, 507, 496, 485, 475, 465, 456,
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446, 437, 428, 420, 412, 404, 396, 388, 381, 374, 367, 360, 354, 347, 341, 335,
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329, 323, 318, 312, 307, 302, 297, 292, 287, 282, 278, 273, 269, 265, 261, 512,
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505, 497, 489, 482, 475, 468, 461, 454, 447, 441, 435, 428, 422, 417, 411, 405,
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399, 394, 389, 383, 378, 373, 368, 364, 359, 354, 350, 345, 341, 337, 332, 328,
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324, 320, 316, 312, 309, 305, 301, 298, 294, 291, 287, 284, 281, 278, 274, 271,
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268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456,
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451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408, 404, 400, 396, 392, 388,
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385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335,
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332, 329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297, 294, 292,
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289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259,
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}
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var shg_table []uint32 = []uint32{
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9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
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17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
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19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
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20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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}
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func (bs *blurstack) NewBlurStack() *blurstack {
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return &blurstack{bs.r, bs.g, bs.b, bs.a, bs.next}
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}
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func Stackblur(img *image.NRGBA, width, height, radius uint32) *image.NRGBA {
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var stackEnd, stackIn, stackOut *blurstack
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var (
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div, widthMinus1, heightMinus1, radiusPlus1, sumFactor uint32
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x, y, i, p, yp, yi, yw,
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r_sum, g_sum, b_sum, a_sum,
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r_out_sum, g_out_sum, b_out_sum, a_out_sum,
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r_in_sum, g_in_sum, b_in_sum, a_in_sum,
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pr, pg, pb, pa uint32
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)
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div = radius + radius + 1
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widthMinus1 = width - 1
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heightMinus1 = height - 1
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radiusPlus1 = radius + 1
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sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2
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bs := blurstack{}
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stackStart := bs.NewBlurStack()
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stack := stackStart
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for i = 1; i < div; i++ {
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stack.next = bs.NewBlurStack()
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stack = stack.next
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if i == radiusPlus1 {
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stackEnd = stack
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}
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}
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stack.next = stackStart
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mul_sum := mul_table[radius]
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shg_sum := shg_table[radius]
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for y = 0; y < height; y++ {
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r_in_sum, g_in_sum, b_in_sum, a_in_sum, r_sum, g_sum, b_sum, a_sum = 0, 0, 0, 0, 0, 0, 0, 0
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pr = uint32(img.Pix[yi])
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pg = uint32(img.Pix[yi+1])
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pb = uint32(img.Pix[yi+2])
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pa = uint32(img.Pix[yi+3])
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r_out_sum = radiusPlus1 * pr
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g_out_sum = radiusPlus1 * pg
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b_out_sum = radiusPlus1 * pb
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a_out_sum = radiusPlus1 * pa
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r_sum += sumFactor * pr
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g_sum += sumFactor * pg
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b_sum += sumFactor * pb
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a_sum += sumFactor * pa
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stack = stackStart
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for i = 0; i < radiusPlus1; i++ {
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stack.r = pr
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stack.g = pg
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stack.b = pb
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stack.a = pa
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stack = stack.next
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}
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for i = 1; i < radiusPlus1; i++ {
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var diff uint32
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if widthMinus1 < i {
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diff = widthMinus1
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} else {
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diff = i
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}
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p = yi + (diff << 2)
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pr = uint32(img.Pix[p])
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pg = uint32(img.Pix[p+1])
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pb = uint32(img.Pix[p+2])
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pa = uint32(img.Pix[p+3])
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stack.r = pr
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stack.g = pg
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stack.b = pb
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stack.a = pa
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r_sum += stack.r * (radiusPlus1 - i)
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g_sum += stack.g * (radiusPlus1 - i)
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b_sum += stack.b * (radiusPlus1 - i)
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a_sum += stack.a * (radiusPlus1 - i)
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r_in_sum += pr
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g_in_sum += pg
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b_in_sum += pb
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a_in_sum += pa
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stack = stack.next
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}
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stackIn = stackStart
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stackOut = stackEnd
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for x = 0; x < width; x++ {
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pa = (a_sum * mul_sum) >> shg_sum
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img.Pix[yi+3] = uint8(pa)
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if pa != 0 {
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pa = 255 / pa
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img.Pix[yi] = uint8((r_sum * mul_sum) >> shg_sum)
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img.Pix[yi+1] = uint8((g_sum * mul_sum) >> shg_sum)
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img.Pix[yi+2] = uint8((b_sum * mul_sum) >> shg_sum)
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} else {
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img.Pix[yi] = 0
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img.Pix[yi+1] = 0
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img.Pix[yi+2] = 0
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}
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r_sum -= r_out_sum
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g_sum -= g_out_sum
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b_sum -= b_out_sum
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a_sum -= a_out_sum
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r_out_sum -= stackIn.r
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g_out_sum -= stackIn.g
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b_out_sum -= stackIn.b
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a_out_sum -= stackIn.a
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p = x + radius + 1
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if p > widthMinus1 {
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p = widthMinus1
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}
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p = (yw + p) << 2
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stackIn.r = uint32(img.Pix[p])
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stackIn.g = uint32(img.Pix[p+1])
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stackIn.b = uint32(img.Pix[p+2])
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stackIn.a = uint32(img.Pix[p+3])
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r_in_sum += stackIn.r
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g_in_sum += stackIn.g
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b_in_sum += stackIn.b
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a_in_sum += stackIn.a
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r_sum += r_in_sum
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g_sum += g_in_sum
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b_sum += b_in_sum
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a_sum += a_in_sum
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stackIn = stackIn.next
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pr = stackOut.r
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pg = stackOut.g
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pb = stackOut.b
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pa = stackOut.a
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r_out_sum += pr
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g_out_sum += pg
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b_out_sum += pb
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a_out_sum += pa
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r_in_sum -= pr
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g_in_sum -= pg
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b_in_sum -= pb
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a_in_sum -= pa
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stackOut = stackOut.next
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yi += 4
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}
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yw += width
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}
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for x = 0; x < width; x++ {
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r_in_sum, g_in_sum, b_in_sum, a_in_sum, r_sum, g_sum, b_sum, a_sum = 0, 0, 0, 0, 0, 0, 0, 0
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yi = x << 2
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pr = uint32(img.Pix[yi])
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pg = uint32(img.Pix[yi+1])
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pb = uint32(img.Pix[yi+2])
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pa = uint32(img.Pix[yi+3])
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r_out_sum = radiusPlus1 * pr
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g_out_sum = radiusPlus1 * pg
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b_out_sum = radiusPlus1 * pb
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a_out_sum = radiusPlus1 * pa
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r_sum += sumFactor * pr
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g_sum += sumFactor * pg
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b_sum += sumFactor * pb
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a_sum += sumFactor * pa
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stack = stackStart
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for i = 0; i < radiusPlus1; i++ {
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stack.r = pr
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stack.g = pg
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stack.b = pb
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stack.a = pa
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stack = stack.next
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}
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yp = width
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for i = 1; i <= radius; i++ {
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yi = (yp + x) << 2
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pr = uint32(img.Pix[yi])
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pg = uint32(img.Pix[yi+1])
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pb = uint32(img.Pix[yi+2])
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pa = uint32(img.Pix[yi+3])
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stack.r = pr
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stack.g = pg
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stack.b = pb
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stack.a = pa
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r_sum += stack.r * (radiusPlus1 - i)
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g_sum += stack.g * (radiusPlus1 - i)
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b_sum += stack.b * (radiusPlus1 - i)
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a_sum += stack.a * (radiusPlus1 - i)
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r_in_sum += pr
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g_in_sum += pg
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b_in_sum += pb
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a_in_sum += pa
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stack = stack.next
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if i < heightMinus1 {
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yp += width
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}
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}
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yi = x
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stackIn = stackStart
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stackOut = stackEnd
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for y = 0; y < height; y++ {
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p = yi << 2
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pa = (a_sum * mul_sum) >> shg_sum
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img.Pix[p+3] = uint8(pa)
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if pa > 0 {
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pa = 255 / pa
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img.Pix[p] = uint8((r_sum * mul_sum) >> shg_sum)
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img.Pix[p+1] = uint8((g_sum * mul_sum) >> shg_sum)
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img.Pix[p+2] = uint8((b_sum * mul_sum) >> shg_sum)
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} else {
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img.Pix[p] = 0
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img.Pix[p+1] = 0
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img.Pix[p+2] = 0
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}
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r_sum -= r_out_sum
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g_sum -= g_out_sum
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b_sum -= b_out_sum
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a_sum -= a_out_sum
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r_out_sum -= stackIn.r
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g_out_sum -= stackIn.g
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b_out_sum -= stackIn.b
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a_out_sum -= stackIn.a
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p = y + radiusPlus1
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if p > heightMinus1 {
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p = heightMinus1
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}
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p = (x + (p * width)) << 2
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stackIn.r = uint32(img.Pix[p])
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stackIn.g = uint32(img.Pix[p+1])
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stackIn.b = uint32(img.Pix[p+2])
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stackIn.a = uint32(img.Pix[p+3])
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r_in_sum += stackIn.r
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g_in_sum += stackIn.g
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b_in_sum += stackIn.b
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a_in_sum += stackIn.a
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r_sum += r_in_sum
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g_sum += g_in_sum
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b_sum += b_in_sum
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a_sum += a_in_sum
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stackIn = stackIn.next
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pr = stackOut.r
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pg = stackOut.g
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pb = stackOut.b
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pa = stackOut.a
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r_out_sum += pr
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g_out_sum += pg
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b_out_sum += pb
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a_out_sum += pa
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r_in_sum -= pr
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g_in_sum -= pg
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b_in_sum -= pb
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a_in_sum -= pa
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stackOut = stackOut.next
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yi += width
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}
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}
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return img
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}
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Block a user