#define CONCAT_I(a, b) a ## b #define CONCAT(a, b) CONCAT_I(a, b) #define pixel_t CONCAT(uint, CONCAT(BPP, _t)) #ifdef GENERIC #define NAME generic #else #define NAME BPP #endif static void CONCAT(send_hextile_tile_, NAME)(VncState *vs, int x, int y, int w, int h, uint32_t *last_bg32, uint32_t *last_fg32, int *has_bg, int *has_fg) { uint8_t *row = (vs->ds->data + y * vs->ds->linesize + x * vs->depth); pixel_t *irow = (pixel_t *)row; int j, i; pixel_t *last_bg = (pixel_t *)last_bg32; pixel_t *last_fg = (pixel_t *)last_fg32; pixel_t bg = 0; pixel_t fg = 0; int n_colors = 0; int bg_count = 0; int fg_count = 0; int flags = 0; uint8_t data[(sizeof(pixel_t) + 2) * 16 * 16]; int n_data = 0; int n_subtiles = 0; for (j = 0; j < h; j++) { for (i = 0; i < w; i++) { switch (n_colors) { case 0: bg = irow[i]; n_colors = 1; break; case 1: if (irow[i] != bg) { fg = irow[i]; n_colors = 2; } break; case 2: if (irow[i] != bg && irow[i] != fg) { n_colors = 3; } else { if (irow[i] == bg) bg_count++; else if (irow[i] == fg) fg_count++; } break; default: break; } } if (n_colors > 2) break; irow += vs->ds->linesize / sizeof(pixel_t); } if (n_colors > 1 && fg_count > bg_count) { pixel_t tmp = fg; fg = bg; bg = tmp; } if (!*has_bg || *last_bg != bg) { flags |= 0x02; *has_bg = 1; *last_bg = bg; } if (!*has_fg || *last_fg != fg) { flags |= 0x04; *has_fg = 1; *last_fg = fg; } switch (n_colors) { case 1: n_data = 0; break; case 2: flags |= 0x08; irow = (pixel_t *)row; for (j = 0; j < h; j++) { int min_x = -1; for (i = 0; i < w; i++) { if (irow[i] == fg) { if (min_x == -1) min_x = i; } else if (min_x != -1) { hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1); n_data += 2; n_subtiles++; min_x = -1; } } if (min_x != -1) { hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1); n_data += 2; n_subtiles++; } irow += vs->ds->linesize / sizeof(pixel_t); } break; case 3: flags |= 0x18; irow = (pixel_t *)row; if (!*has_bg || *last_bg != bg) flags |= 0x02; for (j = 0; j < h; j++) { int has_color = 0; int min_x = -1; pixel_t color = 0; /* shut up gcc */ for (i = 0; i < w; i++) { if (!has_color) { if (irow[i] == bg) continue; color = irow[i]; min_x = i; has_color = 1; } else if (irow[i] != color) { has_color = 0; #ifdef GENERIC vnc_convert_pixel(vs, data + n_data, color); n_data += vs->pix_bpp; #else memcpy(data + n_data, &color, sizeof(color)); n_data += sizeof(pixel_t); #endif hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1); n_data += 2; n_subtiles++; min_x = -1; if (irow[i] != bg) { color = irow[i]; min_x = i; has_color = 1; } } } if (has_color) { #ifdef GENERIC vnc_convert_pixel(vs, data + n_data, color); n_data += vs->pix_bpp; #else memcpy(data + n_data, &color, sizeof(color)); n_data += sizeof(pixel_t); #endif hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1); n_data += 2; n_subtiles++; } irow += vs->ds->linesize / sizeof(pixel_t); } /* A SubrectsColoured subtile invalidates the foreground color */ *has_fg = 0; if (n_data > (w * h * sizeof(pixel_t))) { n_col

\chapter{Programming Yosys Extensions}
\label{chapter:prog}

This chapter contains some bits and pieces of information about programming
yosys extensions. Also consult the section on programming in the ``Yosys
Presentation'' (can be downloaded from the Yosys website as PDF) and don't
be afraid to ask questions on the Yosys Subreddit.

\section{The ``CodingReadme'' File}

The following is an excerpt of the {\tt CodingReadme} file from the Yosys source tree.

\lstinputlisting[title=CodingReadme,rangeprefix=--,rangesuffix=--,includerangemarker=false,linerange=snip-snap,numbers=left,frame=single]{../CodingReadme}

\section{The ``stubsnets'' Example Module}

The following is the complete code of the ``stubsnets'' example module. It is included in the Yosys source distribution as {\tt manual/CHAPTER\_Prog/stubnets.cc}.


\lstinputlisting[title=stubnets.cc,numbers=left,frame=single,language=C++]{CHAPTER_Prog/stubnets.cc}

\lstinputlisting[title=Makefile,numbers=left,frame=single,language=make]{CHAPTER_Prog/Makefile}

\lstinputlisting[title=test.v,numbers=left,frame=single,language=Verilog]{CHAPTER_Prog/test.v}