void draw_rectangle(int x, int y, int w, int h, color_t border, color_t back)
{
// Background parts
const wchar_t
kLowerRightQuad = 0x2597, kLowerHalf = 0x2584, kLowerLeftQuad = 0x2596,
kRightHalf = 0x2590, kFullBlock = 0x2588, kLeftHalf = 0x258C,
kUpperRightQuad = 0x259D, kUpperHalf = 0x2580, kUpperLeftQuad = 0x2598;
// Border parts
const wchar_t
kUpperLeftCorner = 0x250C, kHorisontal = 0x2500, kUpperRightCorner = 0x2510,
kVertical = 0x2502, /* none */ /* kVertical */
kLowerLeftCorner = 0x2514, /* kHorisontal */ kLowerRightCorner = 0x2518;
// FIXME
terminal_blending(BLENDING_ADDITIVE);
// First, background
if (color_alpha(back) > 0)
{
terminal_color(back);
for ( int i = x+1; i < (x+w)-1; i++ )
{
for ( int j = y+1; j < (y+h)-1; j++ )
{
terminal_put(i, j, kFullBlock);
}
terminal_put(i, y, kLowerHalf);
terminal_put(i, y+h-1, kUpperHalf);
}
for ( int j = y+1; j < (y+h)-1; j++ )
{
terminal_put(x, j, kRightHalf);
terminal_put(x+w-1, j, kLeftHalf);
}
terminal_put(x, y, kLowerRightQuad);
terminal_put(x+w-1, y, kLowerLeftQuad);
terminal_put(x, y+h-1, kUpperRightQuad);
terminal_put(x+w-1, y+h-1, kUpperLeftQuad);
}
// Then, border
terminal_color(border);
for ( int i = x+1; i < (x+w)-1; i++ )
{
terminal_put(i, y, kHorisontal);
terminal_put(i, y+h-1, kHorisontal);
}
for ( int j = y+1; j < (y+h)-1; j++ )
{
terminal_put(x, j, kVertical);
terminal_put(x+w-1, j, kVertical);
}
terminal_put(x, y, kUpperLeftCorner);
terminal_put(x+w-1, y, kUpperRightCorner);
terminal_put(x, y+h-1, kLowerLeftCorner);
terminal_put(x+w-1, y+h-1, kLowerRightCorner);
}
static Sk4f overlay_4f(const Sk4f& s, const Sk4f& d) {
Sk4f sa = alpha(s);
Sk4f da = alpha(d);
Sk4f two = Sk4f(2);
Sk4f rc = (two * d <= da).thenElse(two * s * d,
sa * da - two * (da - d) * (sa - s));
return pin_1(s + d - s * da + color_alpha(rc - d * sa, 0));
}
static Sk4f colorburn_4f(const Sk4f& s, const Sk4f& d) {
Sk4f sa = alpha(s);
Sk4f da = alpha(d);
Sk4f isa = Sk4f(1) - sa;
Sk4f ida = Sk4f(1) - da;
Sk4f srcover = s + d * isa;
Sk4f dstover = d + s * ida;
Sk4f otherwise = sa * (da - Sk4f::Min(da, (da - d) * sa / s)) + s * ida + d * isa;
// Order matters here, preferring d==da over s==0.
auto colors = (d == da).thenElse(dstover,
(s == Sk4f(0)).thenElse(srcover,
otherwise));
return color_alpha(colors, srcover);
}
static Sk4f saturation_4f(const Sk4f& s, const Sk4f& d) {
float sa = s[SkPM4f::A];
float sr = s[SkPM4f::R];
float sg = s[SkPM4f::G];
float sb = s[SkPM4f::B];
float da = d[SkPM4f::A];
float dr = d[SkPM4f::R];
float dg = d[SkPM4f::G];
float db = d[SkPM4f::B];
float Dr = dr;
float Dg = dg;
float Db = db;
SetSat(&Dr, &Dg, &Db, Sat(sr, sg, sb) * da);
SetLum(&Dr, &Dg, &Db, sa * da, Lum(dr, dg, db) * sa);
return color_alpha(s * inv_alpha(d) + d * inv_alpha(s) + set_argb(0, Dr, Dg, Db),
sa + da - sa * da);
}
static Sk4f hue_4f(const Sk4f& s, const Sk4f& d) {
float sa = s[SkPM4f::A];
float sr = s[SkPM4f::R];
float sg = s[SkPM4f::G];
float sb = s[SkPM4f::B];
float da = d[SkPM4f::A];
float dr = d[SkPM4f::R];
float dg = d[SkPM4f::G];
float db = d[SkPM4f::B];
float Sr = sr;
float Sg = sg;
float Sb = sb;
SetSat(&Sr, &Sg, &Sb, Sat(dr, dg, db) * sa);
SetLum(&Sr, &Sg, &Sb, sa * da, Lum(dr, dg, db) * sa);
return color_alpha(s * inv_alpha(d) + d * inv_alpha(s) + set_argb(0, Sr, Sg, Sb),
sa + da - sa * da);
}
static Sk4f luminosity_4f(const Sk4f& s, const Sk4f& d) {
float sa = s[SkPM4f::A];
float sr = s[SkPM4f::R];
float sg = s[SkPM4f::G];
float sb = s[SkPM4f::B];
float da = d[SkPM4f::A];
float dr = d[SkPM4f::R];
float dg = d[SkPM4f::G];
float db = d[SkPM4f::B];
float Dr = dr;
float Dg = dg;
float Db = db;
SetLum(&Dr, &Dg, &Db, sa * da, Lum(sr, sg, sb) * da);
Sk4f res = color_alpha(s * inv_alpha(d) + d * inv_alpha(s) + set_argb(0, Dr, Dg, Db),
sa + da - sa * da);
// Can return tiny negative values ...
return Sk4f::Max(res, Sk4f(0));
}
static Sk4f color_4f(const Sk4f& s, const Sk4f& d) {
float sa = s[SkPM4f::A];
float sr = s[SkPM4f::R];
float sg = s[SkPM4f::G];
float sb = s[SkPM4f::B];
float da = d[SkPM4f::A];
float dr = d[SkPM4f::R];
float dg = d[SkPM4f::G];
float db = d[SkPM4f::B];
float Sr = sr;
float Sg = sg;
float Sb = sb;
SetLum(&Sr, &Sg, &Sb, sa * da, Lum(dr, dg, db) * sa);
Sk4f res = color_alpha(s * inv_alpha(d) + d * inv_alpha(s) + set_argb(0, Sr, Sg, Sb),
sa + da - sa * da);
// Can return tiny negative values ...
return Sk4f::Max(res, Sk4f(0));
}
static Sk4f softlight_4f(const Sk4f& s, const Sk4f& d) {
Sk4f sa = alpha(s);
Sk4f da = alpha(d);
Sk4f isa = Sk4f(1) - sa;
Sk4f ida = Sk4f(1) - da;
// Some common terms.
Sk4f m = (da > Sk4f(0)).thenElse(d / da, Sk4f(0));
Sk4f s2 = Sk4f(2) * s;
Sk4f m4 = Sk4f(4) * m;
// The logic forks three ways:
// 1. dark src?
// 2. light src, dark dst?
// 3. light src, light dst?
Sk4f darkSrc = d * (sa + (s2 - sa) * (Sk4f(1) - m)); // Used in case 1.
Sk4f darkDst = (m4 * m4 + m4) * (m - Sk4f(1)) + Sk4f(7) * m; // Used in case 2.
Sk4f liteDst = m.sqrt() - m; // Used in case 3.
Sk4f liteSrc = d * sa + da * (s2 - sa) * (Sk4f(4) * d <= da).thenElse(darkDst,
liteDst); // Case 2 or 3?
return color_alpha(s * ida + d * isa + (s2 <= sa).thenElse(darkSrc, liteSrc), // Case 1 or 2/3?
s + d * isa);
}
virtual void on_draw()
{
typedef agg::pixfmt_bgr24 pixfmt;
typedef agg::renderer_base<pixfmt> renderer_base;
pixfmt pixf(rbuf_window());
renderer_base rb(pixf);
rb.clear(agg::rgba(1.0, 1.0, 1.0));
agg::trans_affine src_mtx;
src_mtx *= agg::trans_affine_translation(-initial_width()/2, -initial_height()/2);
src_mtx *= agg::trans_affine_rotation(10.0 * agg::pi / 180.0);
src_mtx *= agg::trans_affine_translation(initial_width()/2, initial_height()/2);
src_mtx *= trans_affine_resizing();
agg::trans_affine img_mtx = src_mtx;
img_mtx.invert();
typedef agg::span_allocator<agg::rgba8> span_alloc;
unsigned i;
unsigned char brightness_alpha_array[agg::span_conv_brightness_alpha_rgb8::array_size];
for(i = 0; i < agg::span_conv_brightness_alpha_rgb8::array_size; i++)
{
brightness_alpha_array[i] =
agg::int8u(m_alpha.value(double(i) /
double(agg::span_conv_brightness_alpha_rgb8::array_size)) * 255.0);
}
agg::span_conv_brightness_alpha_rgb8 color_alpha(brightness_alpha_array);
typedef agg::image_accessor_clip<pixfmt> img_source_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_image_filter_rgb_bilinear<img_source_type,
interpolator_type> span_gen;
typedef agg::span_converter<span_gen,
agg::span_conv_brightness_alpha_rgb8> span_conv;
span_alloc sa;
interpolator_type interpolator(img_mtx);
pixfmt img_pixf(rbuf_img(0));
img_source_type img_src(img_pixf, agg::rgba(0,0,0,0));
span_gen sg(img_src, interpolator);
span_conv sc(sg, color_alpha);
agg::ellipse ell;
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
for(i = 0; i < 50; i++)
{
ell.init(m_x[i], m_y[i], m_rx[i], m_ry[i], 50);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, rb, m_colors[i]);
}
ell.init(initial_width() / 2.0,
initial_height() / 2.0,
initial_width() / 1.9,
initial_height() / 1.9, 200);
agg::conv_transform<agg::ellipse> tr(ell, src_mtx);
ras.add_path(tr);
agg::render_scanlines_aa(ras, sl, rb, sa, sc);
agg::render_ctrl(ras, sl, rb, m_alpha);
}
static Sk4f color_alpha(const Sk4f& color, const Sk4f& newAlpha) {
return color_alpha(color, newAlpha[3]);
}
static Sk4f exclusion_4f(const Sk4f& s, const Sk4f& d) {
Sk4f product = s * d;
return s + d - product - color_alpha(product, 0);
}
static Sk4f difference_4f(const Sk4f& s, const Sk4f& d) {
Sk4f min = Sk4f::Min(s * alpha(d), d * alpha(s));
return s + d - min - color_alpha(min, 0);
}
void builder::node(string str, bool add_space) {
string::size_type n, m;
string s(str);
while (true) {
if (s.empty()) {
break;
} else if ((n = s.find("%{F-}")) == 0) {
color_close(!m_lazy);
s.erase(0, 5);
} else if ((n = s.find("%{F#")) == 0 && (m = s.find("}")) != string::npos) {
if (m - n - 4 == 2)
color_alpha(s.substr(n + 3, m - 3));
else
color(s.substr(n + 3, m - 3));
s.erase(n, m + 1);
} else if ((n = s.find("%{B-}")) == 0) {
background_close(!m_lazy);
s.erase(0, 5);
} else if ((n = s.find("%{B#")) == 0 && (m = s.find("}")) != string::npos) {
background(s.substr(n + 3, m - 3));
s.erase(n, m + 1);
} else if ((n = s.find("%{T-}")) == 0) {
font_close(!m_lazy);
s.erase(0, 5);
} else if ((n = s.find("%{T")) == 0 && (m = s.find("}")) != string::npos) {
font(std::atoi(s.substr(n + 3, m - 3).c_str()));
s.erase(n, m + 1);
} else if ((n = s.find("%{U-}")) == 0) {
line_color_close(!m_lazy);
s.erase(0, 5);
} else if ((n = s.find("%{U#")) == 0 && (m = s.find("}")) != string::npos) {
line_color(s.substr(n + 3, m - 3));
s.erase(n, m + 1);
} else if ((n = s.find("%{+u}")) == 0) {
underline();
s.erase(0, 5);
} else if ((n = s.find("%{+o}")) == 0) {
overline();
s.erase(0, 5);
} else if ((n = s.find("%{-u}")) == 0) {
underline_close(true);
s.erase(0, 5);
} else if ((n = s.find("%{-o}")) == 0) {
overline_close(true);
s.erase(0, 5);
} else if ((n = s.find("%{A}")) == 0) {
cmd_close(true);
s.erase(0, 4);
} else if ((n = s.find("%{")) == 0 && (m = s.find("}")) != string::npos) {
append(s.substr(n, m + 1));
s.erase(n, m + 1);
} else if ((n = s.find("%{")) > 0) {
append(s.substr(0, n));
s.erase(0, n);
} else
break;
}
if (!s.empty())
append(s);
if (add_space)
space();
}