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lvgl_cpp/lvgl/draw/sdl/lv_draw_sdl_stack_blur.c

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v0.1
2023-03-14 11:57:25 +00:00
/**
* @file lv_draw_sdl_stack_blur.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_draw_sdl_stack_blur.h"
#if LV_USE_GPU_SDL
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void
stack_blur_job(lv_opa_t * src, unsigned int w, unsigned int h, unsigned int radius, int cores, int core, int step);
/**********************
* STATIC VARIABLES
**********************/
// Based heavily on http://vitiy.info/Code/stackblur.cpp
// See http://vitiy.info/stackblur-algorithm-multi-threaded-blur-for-cpp/
// Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.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
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void lv_stack_blur_grayscale(lv_opa_t * buf, uint16_t w, uint16_t h, uint16_t r)
{
stack_blur_job(buf, w, h, r, 1, 0, 1);
stack_blur_job(buf, w, h, r, 1, 0, 2);
}
/**********************
* STATIC FUNCTIONS
**********************/
static void stack_blur_job(lv_opa_t * src, unsigned int w, unsigned int h, unsigned int radius, int cores, int core,
int step)
{
if(radius < 2 || radius > 254) {
/* Silently ignore bad radius */
return;
}
unsigned int x, y, xp, yp, i;
unsigned int sp;
unsigned int stack_start;
unsigned char * stack_ptr;
lv_opa_t * src_ptr;
lv_opa_t * dst_ptr;
unsigned long sum_r;
unsigned long sum_in_r;
unsigned long sum_out_r;
unsigned int wm = w - 1;
unsigned int hm = h - 1;
unsigned int stride = w;
unsigned int div = (radius * 2) + 1;
unsigned int mul_sum = stackblur_mul[radius];
unsigned char shr_sum = stackblur_shr[radius];
unsigned char stack[254 * 2 + 1];
if(step == 1) {
unsigned int minY = core * h / cores;
unsigned int maxY = (core + 1) * h / cores;
for(y = minY; y < maxY; y++) {
sum_r =
sum_in_r =
sum_out_r = 0;
src_ptr = src + stride * y; // start of line (0,y)
for(i = 0; i <= radius; i++) {
stack_ptr = &stack[i];
stack_ptr[0] = src_ptr[0];
sum_r += src_ptr[0] * (i + 1);
sum_out_r += src_ptr[0];
}
for(i = 1; i <= radius; i++) {
if(i <= wm) src_ptr += 1;
stack_ptr = &stack[i + radius];
stack_ptr[0] = src_ptr[0];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_in_r += src_ptr[0];
}
sp = radius;
xp = radius;
if(xp > wm) xp = wm;
src_ptr = src + (xp + y * w); // img.pix_ptr(xp, y);
dst_ptr = src + y * stride; // img.pix_ptr(0, y);
for(x = 0; x < w; x++) {
dst_ptr[0] = LV_CLAMP((sum_r * mul_sum) >> shr_sum, 0, 255);
dst_ptr += 1;
sum_r -= sum_out_r;
stack_start = sp + div - radius;
if(stack_start >= div) stack_start -= div;
stack_ptr = &stack[stack_start];
sum_out_r -= stack_ptr[0];
if(xp < wm) {
src_ptr += 1;
++xp;
}
stack_ptr[0] = src_ptr[0];
sum_in_r += src_ptr[0];
sum_r += sum_in_r;
++sp;
if(sp >= div) sp = 0;
stack_ptr = &stack[sp];
sum_out_r += stack_ptr[0];
sum_in_r -= stack_ptr[0];
}
}
}
// step 2
if(step == 2) {
unsigned int minX = core * w / cores;
unsigned int maxX = (core + 1) * w / cores;
for(x = minX; x < maxX; x++) {
sum_r =
sum_in_r =
sum_out_r = 0;
src_ptr = src + x; // x,0
for(i = 0; i <= radius; i++) {
stack_ptr = &stack[i];
stack_ptr[0] = src_ptr[0];
sum_r += src_ptr[0] * (i + 1);
sum_out_r += src_ptr[0];
}
for(i = 1; i <= radius; i++) {
if(i <= hm) src_ptr += stride; // +stride
stack_ptr = &stack[i + radius];
stack_ptr[0] = src_ptr[0];
sum_r += src_ptr[0] * (radius + 1 - i);
sum_in_r += src_ptr[0];
}
sp = radius;
yp = radius;
if(yp > hm) yp = hm;
src_ptr = src + (x + yp * w); // img.pix_ptr(x, yp);
dst_ptr = src + x; // img.pix_ptr(x, 0);
for(y = 0; y < h; y++) {
dst_ptr[0] = LV_CLAMP((sum_r * mul_sum) >> shr_sum, 0, 255);
dst_ptr += stride;
sum_r -= sum_out_r;
stack_start = sp + div - radius;
if(stack_start >= div) stack_start -= div;
stack_ptr = &stack[stack_start];
sum_out_r -= stack_ptr[0];
if(yp < hm) {
src_ptr += stride; // stride
++yp;
}
stack_ptr[0] = src_ptr[0];
sum_in_r += src_ptr[0];
sum_r += sum_in_r;
++sp;
if(sp >= div) sp = 0;
stack_ptr = &stack[sp];
sum_out_r += stack_ptr[0];
sum_in_r -= stack_ptr[0];
}
}
}
}
#endif /*LV_USE_GPU_SDL*/