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https://github.com/libretro/RetroArch
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46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#include "bleed.h"
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#include <stdlib.h>
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#include <string.h>
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void bleed_filter(uint16_t *data, int width, int height)
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{
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uint16_t tmp[4];
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int ptr = 0;
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uint16_t r[4];
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uint16_t g[4];
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uint16_t b[4];
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uint16_t bleed_r;
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uint16_t bleed_g;
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uint16_t bleed_b;
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float rand_map[4];
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for (int h = 0; h < height; h++ )
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{
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memcpy(tmp, data, sizeof(tmp));
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ptr = 3;
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for (int i = 0; i < 4; i++)
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{
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rand_map[i] = (rand() % 20)/1000.0; // 0.02 * 4 = 0.08
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}
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for (int i = 3; i < width; i++, ptr++)
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{
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tmp[ptr & 0x3] = data[i];
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for (int y = 0; y < 4; y++)
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{
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r[y] = (tmp[(ptr + y) & 0x3] >> 10) & 0x1F;
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g[y] = (tmp[(ptr + y) & 0x3] >> 5) & 0x1F;
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b[y] = (tmp[(ptr + y) & 0x3] >> 0) & 0x1F;
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}
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bleed_r = r[0] * (0.05 + rand_map[0] ) + r[1] * (0.10 + rand_map[1] ) + r[2] * (0.20 + rand_map[2]) + r[3] * (0.57 + rand_map[3] ); // 0.92
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bleed_g = g[0] * (0.03 + rand_map[2]/3) + g[1] * (0.10 + rand_map[0]/3) + g[2] * (0.20 + rand_map[3]/3) + g[3] * (0.63 + rand_map[1]/3); // 0.96
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bleed_b = b[0] * (0.05 + rand_map[3] ) + b[1] * (0.10 + rand_map[2] ) + b[2] * (0.20 + rand_map[1]) + b[3] * (0.57 + rand_map[0] ); // 0.92
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data[i] = (bleed_r << 10) | (bleed_g << 5) | (bleed_b);
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}
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data += width;
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}
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}
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