#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<style>pre { line-height: 125%; margin: 0; }
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.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
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.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
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.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
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.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
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.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="k">\chapter</span><span class="nb">{</span>Programming Yosys Extensions<span class="nb">}</span>
<span class="k">\label</span><span class="nb">{</span>chapter:prog<span class="nb">}</span>

This chapter contains some bits and pieces of information about programming
yosys extensions. Also consult the section on programming in the ``Yosys
Presentation&#39;&#39; (can be downloaded from the Yosys website as PDF) and don&#39;t
be afraid to ask questions on the Yosys Subreddit.

<span class="k">\section</span><span class="nb">{</span>The ``CodingReadme&#39;&#39; File<span class="nb">}</span>

The following is an excerpt of the <span class="nb">{</span><span class="k">\tt</span> CodingReadme<span class="nb">}</span> file from the Yosys source tree.

<span class="k">\lstinputlisting</span><span class="na">[title=CodingReadme,rangeprefix=--,rangesuffix=--,includerangemarker=false,linerange=snip-snap,numbers=left,frame=single]</span><span class="nb">{</span>../CodingReadme<span class="nb">}</span>

<span class="k">\section</span><span class="nb">{</span>The ``stubsnets&#39;&#39; Example Module<span class="nb">}</span>

The following is the complete code of the ``stubsnets&#39;&#39; example module. It is included in the Yosys source distribution as <span class="nb">{</span><span class="k">\tt</span> manual/CHAPTER<span class="k">\_</span>Prog/stubnets.cc<span class="nb">}</span>.


<span class="k">\lstinputlisting</span><span class="na">[title=stubnets.cc,numbers=left,frame=single,language=C++]</span><span class="nb">{</span>CHAPTER<span class="nb">_</span>Prog/stubnets.cc<span class="nb">}</span>

<span class="k">\lstinputlisting</span><span class="na">[title=Makefile,numbers=left,frame=single,language=make]</span><span class="nb">{</span>CHAPTER<span class="nb">_</span>Prog/Makefile<span class="nb">}</span>

<span class="k">\lstinputlisting</span><span class="na">[title=test.v,numbers=left,frame=single,language=Verilog]</span><span class="nb">{</span>CHAPTER<span class="nb">_</span>Prog/test.v<span class="nb">}</span>
</pre></div>
</code></pre></td></tr></table>
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