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https://github.com/jart/cosmopolitan.git
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0a24b4fc3c
The *NSYNC linked list API is good enough that it deserves to be part of the C libray, so this change writes an improved version of it which uses that offsetof() trick from the Linux Kernel. We vendor all of the *NSYNC tests in third_party which helped confirm the needed refactoring is safe This change also deletes more old code that didn't pan out. My goal here is to work towards a vision where the Cosmopolitan core libraries become less experimental and more focused on curation. This better reflects the current level of quality we've managed to achieve.
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#ifndef COSMOPOLITAN_TOOL_VIZ_LIB_CONVOLVE_H_
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#define COSMOPOLITAN_TOOL_VIZ_LIB_CONVOLVE_H_
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#include "dsp/tty/quant.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "tool/viz/lib/graphic.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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typedef float convolve_t __attribute__((__vector_size__(16)));
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forceinline void convolve(unsigned yn, unsigned xn, ttyrgb_m128 img[yn][xn],
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int KW, const float kernel[KW][KW], float C1,
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float C2) {
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/* TODO(jart): nontemporal herringbone strategy */
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float f;
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struct Graphic g;
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unsigned y, x, i, j;
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convolve_t p, kflip[KW][KW], (*tmp)[yn][xn];
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for (i = 0; i < KW; ++i) {
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for (j = 0; j < KW; ++j) {
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f = kernel[i][j] / C1;
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kflip[KW - i - 1][KW - j - 1] = (convolve_t){f, f, f, f};
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}
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}
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bzero(&g, sizeof(g));
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resizegraphic(&g, yn, xn);
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tmp = g.b;
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for (y = 0; y < yn - KW; ++y) {
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for (x = 0; x < xn - KW; ++x) {
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bzero(&p, sizeof(p));
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for (i = 0; i < KW; ++i) {
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for (j = 0; j < KW; ++j) {
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p += img[y + i][x + j] * kflip[i][j] + C2;
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}
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}
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memcpy(&(*tmp)[y + KW / 2][x + KW / 2], &p, sizeof(p));
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}
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}
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memcpy(img, tmp, yn * xn * sizeof(img[0][0]));
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free(g.b);
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_TOOL_VIZ_LIB_CONVOLVE_H_ */
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