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Updated scintilla_disable_color_palette() and support default colors #40

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Updated scintilla_disable_color_palette() and support default colors #40

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806fa1d
Added ability to disable use of the terminal's default color palette.
orbitalquark Nov 13, 2025
14c560e
added scintilla_set_default_colors()
rhaberkorn May 9, 2026
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141 changes: 105 additions & 36 deletions PlatCurses.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -129,20 +129,40 @@ Colors &Colors::instance() {
}

short Colors::get(const ColourRGBA &color) {
if (const auto entry = colors.find(color.OpaqueRGB()); entry != colors.end())
if (const auto entry = instance().colors.find(color.OpaqueRGB()); entry != instance().colors.end())
return entry->second;
if (colorOffset + colors.size() >= std::numeric_limits<short>::max()) return COLOR_WHITE;
const short c = colorOffset + colors.size();
init_color(c, color.GetRed() * 1000.0 / 255, color.GetGreen() * 1000.0 / 255,
short i = instance().colorOffset + instance().colors.size();

@orbitalquark orbitalquark May 12, 2026

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This can overflow if the right-hand-side is greater than short max, right?

// try not to overwrite a default color
if (!instance().usePalette && COLORS > 16 && instance().colorOffset < 16)
i += 16 - instance().colorOffset;
Comment on lines +136 to +137

@orbitalquark orbitalquark May 12, 2026

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I don't understand this. Can it be simplified? My branch had if (!usePalette) i += std::clamp(COLORS, 8, 16); Remember the next line short-circuits an i that exceeds COLORS.

if (i >= COLORS || i >= std::numeric_limits<short>::max()) return COLOR_WHITE;
init_color(i, color.GetRed() * 1000.0 / 255, color.GetGreen() * 1000.0 / 255,
color.GetBlue() * 1000.0 / 255);
colors.emplace(color.OpaqueRGB(), c);
return c;
instance().colors.emplace(color.OpaqueRGB(), i);
return i;
}

short Colors::Pair(const ColourRGBA &fore, const ColourRGBA &back) {
if (!has_colors()) return 0;
short Colors::Pair(attr_t &attrs, const ColourRGBA &fore, const ColourRGBA &back) {

@orbitalquark orbitalquark May 12, 2026

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No, I don't like the silent pass through and modification of an attrs parameter. For me, this will cause hard-to-debug issues. I feel like I either brought this up in another PR, or we discussed this back when Colors::Pair() returned an attr_t instead of a color pair number.

We should probably have a private function that returns WA_REVERSE that we can | to an existing attr_t before calls to Colors::Pair() and mvwchgat() and wattr_set().

// If the terminal is a dumb one without colors, we can work with a "second pair"
// that is the reverse of the current one if the background color to draw is
// white. This applies to all `mvwchgat()` and `wattr_set()` calls.
if (!has_colors()) {
if (!(back.Opaque() == Colors::Black)) attrs ^= WA_REVERSE;
return 0;
}

short fore_id, back_id;

if (fore.OpaqueRGB() == instance().defaultBack && back.OpaqueRGB() == instance().defaultFore) {
fore_id = back_id = -1;
attrs ^= WA_REVERSE;
} else {
fore_id = fore.OpaqueRGB() == instance().defaultFore ? -1 : get(fore);
back_id = back.OpaqueRGB() == instance().defaultBack ? -1 : get(back);
}

const auto pair = std::make_pair(fore_id, back_id);
auto &pairs = instance().pairs;
const auto pair = std::make_pair(instance().get(fore), instance().get(back));
if (const auto entry = pairs.find(pair); entry != pairs.end()) return entry->second;
size_t max_pairs = COLOR_PAIRS;
if (const size_t short_max = std::numeric_limits<short>::max(); short_max < max_pairs)
Expand All @@ -160,11 +180,30 @@ ColourRGBA Colors::Find(const short color) {
return Colors::White;
}

void Colors::DisablePalette() {
instance().usePalette = false;
instance().colors.clear();
instance().pairs.clear();
}

void Colors::SetOffsets(int colorOffset, int pairOffset) {
instance().colorOffset = colorOffset;
instance().pairOffset = pairOffset;
}

void Colors::SetDefaultColors(int fore, int back) {
instance().defaultFore = fore;
instance().defaultBack = back;
}

int Colors::GetDefaultFore() {
return instance().defaultFore;
}

int Colors::GetDefaultBack() {
return instance().defaultBack;
}
Comment on lines +194 to +205

@orbitalquark orbitalquark May 12, 2026

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I think we can have static DefaultFore and DefaultBack members just like the colors Black, Red, etc. Since they're not const, they should be mutable for Colors::SetDefaultColors().

Maybe we can store it as a curses color number and ColorRGBA pair so we don't have to keep doing lookups later and also keep Colors::get() as a private instance method.


// Surface handling.

SurfaceImpl::~SurfaceImpl() noexcept { Release(); }
Expand Down Expand Up @@ -224,12 +263,9 @@ void SurfaceImpl::PolyLine(const Point *pts, size_t npts, Stroke stroke) {
short pair = 0, unused_color, back = COLOR_BLACK;
mvwin_wch(win, y, x, &wch), getcchar(&wch, unused_wch, &attrs, &pair, nullptr);
if (pair > 0) pair_content(pair, &unused_color, &back);
// If the terminal is a dumb one without colors, we can work with a "second pair"
// that is the reverse of the current one if the background color to draw is
// white. This applies to all `mvwchgat()` and `wattr_set()` calls.
if (!(has_colors() || Colors::Find(back).Opaque() == Colors::Black)) attrs |= WA_REVERSE;
mvwchgat(
win, y, x, 1, attrs | WA_UNDERLINE, Colors::Pair(stroke.colour, Colors::Find(back)), nullptr);
if (back < 0) back = Colors::get(ColourRGBA::FromRGB(Colors::GetDefaultBack()));
pair = Colors::Pair(attrs, stroke.colour, Colors::Find(back));
mvwchgat(win, y, x, 1, attrs | WA_UNDERLINE, pair, nullptr);
}
}

Expand All @@ -238,8 +274,11 @@ void SurfaceImpl::PolyLine(const Point *pts, size_t npts, Stroke stroke) {
// normally drawn as polygons are handled in `DrawLineMarker()`.
void SurfaceImpl::Polygon(const Point *pts, size_t npts, FillStroke fillStroke) {
ColourRGBA &back = fillStroke.fill.colour;
const attr_t attrs = has_colors() ? 0 : WA_REVERSE;
wattr_set(win, attrs, Colors::Pair(back, Colors::White), nullptr); // invert
const ColourRGBA &fore = Colors::GetDefaultFore() >= 0
? ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
attr_t attrs = 0;
short pair = Colors::Pair(attrs, back, fore); // invert
wattr_set(win, attrs, pair, nullptr);
if (pts[0].y < pts[npts - 1].y) // up arrow
mvwaddstr(win, static_cast<int>(pts[0].y), static_cast<int>(pts[npts - 1].x - 2), "▲");
else if (pts[0].y > pts[npts - 1].y) // down arrow
Expand All @@ -256,19 +295,25 @@ void SurfaceImpl::RectangleFrame(PRectangle /*rc*/, Stroke /*stroke*/) {}
// Normally this clears the given portion of the screen with the given background color. In
// some cases however, it can be determined that whitespace is being drawn. If so, draw it
// appropriately instead of clearing the given portion of the screen.
// This can also draw the caret.

@orbitalquark orbitalquark May 12, 2026

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Thanks for pointing this out.

void SurfaceImpl::FillRectangle(PRectangle rc, Fill fill) {
if (!win) {
// Drawing to a pixmap, probably the fold margin. Record the color for a later fill.
pixmapColor = fill.colour;
return;
}
const attr_t attrs = has_colors() || fill.colour.Opaque() == Colors::Black ? 0 : WA_REVERSE;
wattr_set(win, attrs, Colors::Pair(Colors::White, fill.colour), nullptr);
attr_t attrs = 0;
const ColourRGBA &fore = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::White;
short pair = Colors::Pair(attrs, fore, fill.colour);
wattr_set(win, attrs, pair, nullptr);
chtype ch = ' ';
if (fabs(rc.left - static_cast<int>(rc.left)) > 0.1) {
// If rc.left is a fractional value (e.g. 4.5) then whitespace dots are being drawn. Draw
// them appropriately.
wattr_set(win, attrs, Colors::Pair(fill.colour, fill.colour), nullptr);
attrs = 0;
short pair = Colors::Pair(attrs, fill.colour, fill.colour);
wattr_set(win, attrs, pair, nullptr);
rc.right = static_cast<int>(rc.right), ch = ACS_BULLET | A_BOLD;
}
for (int y = static_cast<int>(rc.top); y < rc.bottom; y++)
Expand Down Expand Up @@ -305,8 +350,9 @@ void SurfaceImpl::AlphaRectangle(PRectangle rc, XYPOSITION /*cornerSize*/, FillS
short pair = 0, fore = COLOR_WHITE, unused_color;
mvwin_wch(win, y, x, &wch), getcchar(&wch, unused_wch, &attrs, &pair, nullptr);
if (pair > 0) pair_content(pair, &fore, &unused_color);
if (!(has_colors() || fill.Opaque() == Colors::Black)) attrs |= WA_REVERSE;
mvwchgat(win, y, x, 1, attrs, Colors::Pair(Colors::Find(fore), fill), nullptr);
if (fore < 0) fore = Colors::get(ColourRGBA::FromRGB(Colors::GetDefaultFore()));
pair = Colors::Pair(attrs, Colors::Find(fore), fill);
mvwchgat(win, y, x, 1, attrs, pair, nullptr);
}
}

Expand All @@ -326,11 +372,22 @@ void SurfaceImpl::Stadium(PRectangle /*rc*/, FillStroke /*fillStroke*/, Ends /*e
// Only called when drawing indentation guides or during certain drawing operations when double
// buffering is enabled. Since the latter is not supported, assume the former.
void SurfaceImpl::Copy(PRectangle rc, Point /*from*/, Surface &surfaceSource) {
const ColourRGBA &fore = dynamic_cast<SurfaceImpl *>(&surfaceSource)->isIndentGuideHighlight ?
Colors::White :
Colors::Black;
ColourRGBA fore, back;
if (dynamic_cast<SurfaceImpl *>(&surfaceSource)->isIndentGuideHighlight) {
fore = Colors::GetDefaultFore() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
back = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
} else {
fore = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
back = Colors::GetDefaultFore() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
}
if (rc.left - 1 < clip.left) return;
wattr_set(win, 0, Colors::Pair(fore, Colors::Black), nullptr);
attr_t attrs = 0;
short pair = Colors::Pair(attrs, fore, back);
wattr_set(win, attrs, pair, nullptr);
mvwaddch(win, static_cast<int>(rc.top), static_cast<int>(rc.left - 1), '|' | A_BOLD);
}

Expand Down Expand Up @@ -360,8 +417,8 @@ int grapheme_width(const char *s) {
void SurfaceImpl::DrawTextNoClip(PRectangle rc, const Font *font_, XYPOSITION /*ybase*/,
std::string_view text, ColourRGBA fore, ColourRGBA back) {
attr_t attrs = dynamic_cast<const FontImpl *>(font_)->attrs;
if (!(has_colors() || back.Opaque() == Colors::Black)) attrs |= WA_REVERSE;
wattr_set(win, attrs, Colors::Pair(fore, back), nullptr);
short pair = Colors::Pair(attrs, fore, back);
wattr_set(win, attrs, pair, nullptr);
if (rc.left < clip.left) {
// Do not overwrite margin text.
auto clip_chars = static_cast<int>(clip.left - rc.left);
Expand Down Expand Up @@ -413,6 +470,11 @@ void SurfaceImpl::DrawTextTransparent(
pair_content(pair, &unused_color, &back);
else if (attrs & WA_REVERSE) // !has_colors() and white terminal background
back = COLOR_WHITE;
if (back < 0) {
// We cannot pass on attrs, so the background color must be correct.
int c = attrs & WA_REVERSE ? Colors::GetDefaultFore() : Colors::GetDefaultBack();
back = Colors::get(ColourRGBA::FromRGB(c));
}
}
DrawTextNoClip(rc, font_, ybase, text, fore, Colors::Find(back));
}
Expand Down Expand Up @@ -480,9 +542,9 @@ void SurfaceImpl::FlushDrawing() {} // N/A
void SurfaceImpl::DrawLineMarker(
const PRectangle &rcWhole, const Font *fontForCharacter, int tFold, const void *data) {
auto marker = reinterpret_cast<const LineMarker *>(data);
attr_t attr = has_colors() || marker->back.Opaque() == Colors::Black ? 0 : WA_REVERSE;
if (tFold) attr |= WA_BOLD;
wattr_set(win, attr, Colors::Pair(marker->fore, marker->back), nullptr);
attr_t attr = tFold ? WA_BOLD : 0;
short pair = Colors::Pair(attr, marker->fore, marker->back);
wattr_set(win, attr, pair, nullptr);
int top = static_cast<int>(rcWhole.top), left = static_cast<int>(rcWhole.left);
switch (marker->markType) {
case MarkerSymbol::Circle: mvwaddstr(win, top, left, "●"); return;
Expand Down Expand Up @@ -526,17 +588,24 @@ void SurfaceImpl::DrawLineMarker(

// Draws the text representation of a wrap marker.
void SurfaceImpl::DrawWrapMarker(PRectangle rcPlace, bool isEndMarker, ColourRGBA wrapColour) {
wattr_set(win, 0, Colors::Pair(wrapColour, Colors::Black), nullptr);
const ColourRGBA &back = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
attr_t attrs = 0;
short pair = Colors::Pair(attrs, wrapColour, back);
wattr_set(win, attrs, pair, nullptr);
mvwaddstr(
win, static_cast<int>(rcPlace.top), static_cast<int>(rcPlace.left), isEndMarker ? "↩" : "↪");
}

// Draws the text representation of a tab arrow.
void SurfaceImpl::DrawTabArrow(PRectangle rcTab, const ViewStyle &vsDraw) {
const ColourRGBA &fore = vsDraw.ElementColour(Element::WhiteSpace).value_or(Colors::Black);
const ColourRGBA &back = vsDraw.ElementColour(Element::WhiteSpaceBack).value_or(Colors::Black);
const attr_t attr = has_colors() || back.Opaque() == Colors::Black ? 0 : WA_REVERSE;
wattr_set(win, attr, Colors::Pair(fore, back), nullptr);
const ColourRGBA &c = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
const ColourRGBA &fore = vsDraw.ElementColour(Element::WhiteSpace).value_or(c);
const ColourRGBA &back = vsDraw.ElementColour(Element::WhiteSpaceBack).value_or(c);
attr_t attr = 0;
short pair = Colors::Pair(attr, fore, back);
wattr_set(win, attr, pair, nullptr);
for (int i = static_cast<int>(std::max(rcTab.left - 1, clip.left)); i < rcTab.right; i++)
mvwaddch(win, static_cast<int>(rcTab.top), i, '-' | A_BOLD);
char tail = vsDraw.tabDrawMode == TabDrawMode::LongArrow ? '>' : '-';
Expand Down
16 changes: 13 additions & 3 deletions PlatCurses.h
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Original file line number Diff line number Diff line change
Expand Up @@ -141,23 +141,33 @@ class Colors {
std::map<int, short> colors; // map of RGB ints to curses color numbers.
std::map<std::pair<short, short>, short> pairs; // map of curses colors to their pair numbers
int colorOffset = 0, pairOffset = 0;
bool usePalette = true;
int defaultFore = -1, defaultBack = -1;

Colors();
static Colors &instance();
/** Returns the curses number for a Scintilla color, initializing it if necessary. */
short get(const ColourRGBA &color);

public:
static ColourRGBA Black, Red, Green, Yellow, Blue, Magenta, Cyan, White;
static ColourRGBA LBlack, LRed, LGreen, LYellow, LBlue, LMagenta, LCyan, LWhite;

/** Returns the curses number for a Scintilla color, initializing it if necessary. */
static short get(const ColourRGBA &color);
/** Returns the curses pair number for a Scintilla color pair, initializing it if necessary. */
static short Pair(const ColourRGBA &fore, const ColourRGBA &back);
static short Pair(attr_t &attrs, const ColourRGBA &fore, const ColourRGBA &back);
/** Returns the Scintilla color for a given curses color number. */
static ColourRGBA Find(const short color);

/** Disables use of the terminal's default color palette. */
static void DisablePalette();
/** Sets the offsets for colors and color pairs generated on-demand. */
static void SetOffsets(int colorOffset, int pairOffset);
/** Sets the default foreground and background colors. */
static void SetDefaultColors(int fore, int back);
/** Gets default foreground color as an integer RGB */
static int GetDefaultFore();
/** Gets default background color as an integer RGB */
static int GetDefaultBack();
Comment on lines +166 to +170

@orbitalquark orbitalquark May 12, 2026

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I don't like the storage class here because I keep thinking it's a curses color number, not an 0xBBGGRR int. Users may or may not get confused that this needs to be 0xBBGGRR instead of 0xRRGGBB. There might be room for improvement here.

};

inline WINDOW *_WINDOW(WindowID wid) { return reinterpret_cast<WINDOW *>(wid); }
Expand Down
40 changes: 33 additions & 7 deletions ScintillaCurses.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -266,14 +266,21 @@ void ScintillaCurses::SetVerticalScrollPos() {
WINDOW *w = GetWINDOW();
int maxy = getmaxy(w), maxx = getmaxx(w);
if (scrollBarHeight == maxy) return; // no point in drawing a non-scrollable bar yet
const ColourRGBA &fore = Colors::GetDefaultFore() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
const ColourRGBA &back = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
// Draw the gutter.
wattr_set(w, 0, Colors::Pair(Colors::White, Colors::Black), nullptr);
attr_t attrs = 0;
short pair = Colors::Pair(attrs, fore, back);
wattr_set(w, attrs, pair, nullptr);
for (int i = 0; i < maxy; i++) mvwaddch(w, i, maxx - 1, ACS_CKBOARD);
// Draw the bar.
scrollBarVPos =
static_cast<int>(static_cast<float>(topLine) / (MaxScrollPos() + LinesOnScreen() - 1) * maxy);
const attr_t attr = has_colors() ? 0 : WA_REVERSE;
wattr_set(w, attr, Colors::Pair(Colors::Black, Colors::White), nullptr); // invert
attrs = 0;
pair = Colors::Pair(attrs, back, fore); // invert
wattr_set(w, attrs, pair, nullptr);
for (int i = scrollBarVPos; i < scrollBarVPos + scrollBarHeight; i++)
mvwaddch(w, i, maxx - 1, ACS_VLINE);
}
Expand All @@ -283,13 +290,20 @@ void ScintillaCurses::SetHorizontalScrollPos() {
WINDOW *w = GetWINDOW();
int maxy = getmaxy(w), maxx = getmaxx(w);
if (scrollBarWidth == maxx) return; // no point in drawing a non-scrollable bar yet
const ColourRGBA &fore = Colors::GetDefaultFore() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
const ColourRGBA &back = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
// Draw the gutter.
wattr_set(w, 0, Colors::Pair(Colors::White, Colors::Black), nullptr);
attr_t attrs = 0;
short pair = Colors::Pair(attrs, fore, back);
wattr_set(w, attrs, pair, nullptr);
for (int i = 0; i < maxx; i++) mvwaddch(w, maxy - 1, i, ACS_CKBOARD);
// Draw the bar.
scrollBarHPos = static_cast<int>(static_cast<float>(xOffset) / scrollWidth * maxx);
const attr_t attr = has_colors() ? 0 : WA_REVERSE;
wattr_set(w, attr, Colors::Pair(Colors::Black, Colors::White), nullptr); // invert
attrs = 0;
pair = Colors::Pair(attrs, back, fore); // invert
wattr_set(w, attrs, pair, nullptr);
for (int i = scrollBarHPos; i < scrollBarHPos + scrollBarWidth; i++)
mvwaddch(w, maxy - 1, i, ACS_HLINE);
}
Expand Down Expand Up @@ -404,7 +418,13 @@ void ScintillaCurses::CreateCallTipWindow(PRectangle rc) {
surface->Init(wid);
dynamic_cast<SurfaceImpl *>(surface.get())->isCallTip = true;
ct.PaintCT(surface.get());
wattr_set(_WINDOW(wid), 0, Colors::Pair(Colors::White, Colors::Black), nullptr);
const ColourRGBA &fore = Colors::GetDefaultFore() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultFore()) : Colors::White;
const ColourRGBA &back = Colors::GetDefaultBack() >= 0 ?
ColourRGBA::FromRGB(Colors::GetDefaultBack()) : Colors::Black;
attr_t attrs = 0;
short pair = Colors::Pair(attrs, fore, back);
wattr_set(_WINDOW(wid), attrs, pair, nullptr);
box(_WINDOW(wid), '|', '-');
wnoutrefresh(_WINDOW(wid));
}
Expand Down Expand Up @@ -699,7 +719,13 @@ void scintilla_update_cursor(void *sci) {

void scintilla_delete(void *sci) { delete reinterpret_cast<ScintillaCurses *>(sci); }

void scintilla_disable_color_palette() { Scintilla::Internal::Colors::DisablePalette(); }

void scintilla_set_color_offsets(int color_offset, int pair_offset) {
Scintilla::Internal::Colors::SetOffsets(color_offset, pair_offset);
}

void scintilla_set_default_colors(int fg, int bg) {
Scintilla::Internal::Colors::SetDefaultColors(fg, bg);
}
}
19 changes: 19 additions & 0 deletions ScintillaCurses.h
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Original file line number Diff line number Diff line change
Expand Up @@ -116,12 +116,31 @@ void scintilla_update_cursor(void *sci);
*/
void scintilla_delete(void *sci);

/**
* Disables use of the terminal's default color palette for all Scintilla windows.
* This only needs to be called once, after calling `start_color()`
* and ideally before any calls to `scintilla_new()`.
*/
void scintilla_disable_color_palette(void);

/**
* Sets the offsets for colors and color pairs generated on-demand.
* Applications that define their own colors and color pairs can tell Scinterm where to start from.
* This should be called after `start_color()`.
*/
void scintilla_set_color_offsets(int color_offset, int pair_offset);

/**
* Configure colors which will be mapped to the terminal's default colors
* when used as the given foreground or background color.
* Default colors might depend on the emulator's color scheme.
* This might not be supported in all curses implementations.
* Use -1 to disable a default foreground or background color.
* You must still call first `start_color()`, then `use_default_colors()`
* or `assume_default_colors()` for this to work.
*/
void scintilla_set_default_colors(int fg, int bg);

#define IMAGE_MAX 31

#define SCM_PRESS 1
Expand Down
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