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// Scintilla source code edit control
/** @file Indicator.cxx
** Defines the style of indicators which are text decorations such as underlining.
**/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <cmath>
#include <stdexcept>
#include <string_view>
#include <vector>
#include <map>
#include <optional>
#include <algorithm>
#include <memory>
#include "Debugging.h"
#include "Geometry.h"
#include "Platform.h"
#include "Scintilla.h"
#include "Indicator.h"
#include "XPM.h"
using namespace Scintilla;
void Indicator::Draw(Surface *surface, const PRectangle &rc, const PRectangle &rcLine, const PRectangle &rcCharacter, State state, int value) const {
StyleAndColour sacDraw = sacNormal;
if (Flags() & SC_INDICFLAG_VALUEFORE) {
sacDraw.fore = ColourDesired(value & SC_INDICVALUEMASK);
}
if (state == State::hover) {
sacDraw = sacHover;
}
const int pixelDivisions = surface->PixelDivisions();
const XYPOSITION strokeWidth = 1.0f;
const XYPOSITION halfWidth = strokeWidth / 2.0f;
const PRectangle rcAligned(PixelAlignOutside(rc, pixelDivisions));
PRectangle rcFullHeightAligned = PixelAlignOutside(rcLine, pixelDivisions);
rcFullHeightAligned.left = rcAligned.left;
rcFullHeightAligned.right = rcAligned.right;
const XYPOSITION ymid = PixelAlign(rc.Centre().y, pixelDivisions);
// This is a reasonable clip for indicators beneath text like underlines
PRectangle rcClip = rcAligned;
rcClip.bottom = rcFullHeightAligned.bottom;
switch (sacDraw.style) {
case INDIC_SQUIGGLE: {
surface->SetClip(rcClip);
XYPOSITION x = rcAligned.left + halfWidth;
const XYPOSITION top = rcAligned.top + halfWidth;
const XYPOSITION xLast = rcAligned.right + halfWidth;
XYPOSITION y = 0;
std::vector<Point> pts;
const XYPOSITION pitch = 1 + strokeWidth;
pts.emplace_back(x, top + y);
while (x < xLast) {
x += pitch;
y = pitch - y;
pts.emplace_back(x, top + y);
}
surface->PolyLine(pts.data(), std::size(pts), Stroke(sacDraw.fore, strokeWidth));
surface->PopClip();
}
break;
case INDIC_SQUIGGLEPIXMAP: {
const PRectangle rcSquiggle = PixelAlign(rc, 1);
const int width = std::min(4000, static_cast<int>(rcSquiggle.Width()));
RGBAImage image(width, 3, 1.0, nullptr);
enum { alphaFull = 0xff, alphaSide = 0x2f, alphaSide2=0x5f };
for (int x = 0; x < width; x++) {
if (x%2) {
// Two halfway columns have a full pixel in middle flanked by light pixels
image.SetPixel(x, 0, sacDraw.fore, alphaSide);
image.SetPixel(x, 1, sacDraw.fore, alphaFull);
image.SetPixel(x, 2, sacDraw.fore, alphaSide);
} else {
// Extreme columns have a full pixel at bottom or top and a mid-tone pixel in centre
image.SetPixel(x, (x % 4) ? 0 : 2, sacDraw.fore, alphaFull);
image.SetPixel(x, 1, sacDraw.fore, alphaSide2);
}
}
surface->DrawRGBAImage(rcSquiggle, image.GetWidth(), image.GetHeight(), image.Pixels());
}
break;
case INDIC_SQUIGGLELOW: {
std::vector<Point> pts;
const XYPOSITION top = rcAligned.top + halfWidth;
int y = 0;
XYPOSITION x = std::round(rcAligned.left) + halfWidth;
pts.emplace_back(x, top + y);
const XYPOSITION pitch = 2 + strokeWidth;
x += pitch;
while (x < rcAligned.right) {
pts.emplace_back(x - 1, top + y);
y = 1 - y;
pts.emplace_back(x, top + y);
x += pitch;
}
pts.emplace_back(rcAligned.right, top + y);
surface->PolyLine(pts.data(), std::size(pts), Stroke(sacDraw.fore, strokeWidth));
}
break;
case INDIC_TT: {
surface->SetClip(rcClip);
const XYPOSITION yLine = ymid;
XYPOSITION x = rcAligned.left + 5.0f;
const XYPOSITION pitch = 4 + strokeWidth;
while (x < rc.right + pitch) {
const PRectangle line(x-pitch, yLine, x, yLine + strokeWidth);
surface->FillRectangle(line, sacDraw.fore);
const PRectangle tail(x - 2 - strokeWidth, yLine + strokeWidth, x - 2, yLine + strokeWidth * 2);
surface->FillRectangle(tail, sacDraw.fore);
x++;
x += pitch;
}
surface->PopClip();
}
break;
case INDIC_DIAGONAL: {
surface->SetClip(rcClip);
XYPOSITION x = rcAligned.left + halfWidth;
const XYPOSITION top = rcAligned.top + halfWidth;
const XYPOSITION pitch = 3 + strokeWidth;
while (x < rc.right) {
const XYPOSITION endX = x+3;
const XYPOSITION endY = top - 1;
surface->LineDraw(Point(x, top + 2), Point(endX, endY), Stroke(sacDraw.fore, strokeWidth));
x += pitch;
}
surface->PopClip();
}
break;
case INDIC_STRIKE: {
const XYPOSITION yStrike = std::round(rcLine.Centre().y);
const PRectangle rcStrike(
rcAligned.left, yStrike, rcAligned.right, yStrike + strokeWidth);
surface->FillRectangle(rcStrike, sacDraw.fore);
}
break;
case INDIC_HIDDEN:
case INDIC_TEXTFORE:
// Draw nothing
break;
case INDIC_BOX: {
PRectangle rcBox = rcFullHeightAligned;
rcBox.top = rcBox.top + 1.0f;
rcBox.bottom = ymid + 1.0f;
surface->RectangleFrame(rcBox, Stroke(ColourAlpha(sacDraw.fore, outlineAlpha), strokeWidth));
}
break;
case INDIC_ROUNDBOX:
case INDIC_STRAIGHTBOX:
case INDIC_FULLBOX: {
PRectangle rcBox = rcFullHeightAligned;
if (sacDraw.style != INDIC_FULLBOX)
rcBox.top = rcBox.top + 1;
surface->AlphaRectangle(rcBox, (sacDraw.style == INDIC_ROUNDBOX) ? 1.0f : 0.0f,
FillStroke(ColourAlpha(sacDraw.fore, fillAlpha), ColourAlpha(sacDraw.fore, outlineAlpha), strokeWidth));
}
break;
case INDIC_GRADIENT:
case INDIC_GRADIENTCENTRE: {
PRectangle rcBox = rcFullHeightAligned;
rcBox.top = rcBox.top + 1;
const Surface::GradientOptions options = Surface::GradientOptions::topToBottom;
const ColourAlpha start(sacDraw.fore, fillAlpha);
const ColourAlpha end(sacDraw.fore, 0);
std::vector<ColourStop> stops;
switch (sacDraw.style) {
case INDIC_GRADIENT:
stops.push_back(ColourStop(0.0, start));
stops.push_back(ColourStop(1.0, end));
break;
case INDIC_GRADIENTCENTRE:
stops.push_back(ColourStop(0.0, end));
stops.push_back(ColourStop(0.5, start));
stops.push_back(ColourStop(1.0, end));
break;
}
surface->GradientRectangle(rcBox, stops, options);
}
break;
case INDIC_DOTBOX: {
PRectangle rcBox = rcFullHeightAligned;
rcBox.top = rcBox.top + 1;
// Cap width at 4000 to avoid large allocations when mistakes made
const int width = std::min(static_cast<int>(rcBox.Width()), 4000);
const int height = static_cast<int>(rcBox.Height());
RGBAImage image(width, height, 1.0, nullptr);
// Draw horizontal lines top and bottom
for (int x=0; x<width; x++) {
for (int y = 0; y< height; y += height - 1) {
image.SetPixel(x, y, sacDraw.fore, ((x + y) % 2) ? outlineAlpha : fillAlpha);
}
}
// Draw vertical lines left and right
for (int y = 1; y<height; y++) {
for (int x=0; x<width; x += width-1) {
image.SetPixel(x, y, sacDraw.fore, ((x + y) % 2) ? outlineAlpha : fillAlpha);
}
}
surface->DrawRGBAImage(rcBox, image.GetWidth(), image.GetHeight(), image.Pixels());
}
break;
case INDIC_DASH: {
XYPOSITION x = std::floor(rc.left);
const XYPOSITION widthDash = 3 + std::round(strokeWidth);
while (x < rc.right) {
const PRectangle rcDash = PRectangle(x, ymid,
x + widthDash, ymid + std::round(strokeWidth));
surface->FillRectangle(rcDash, sacDraw.fore);
x += 3 + widthDash;
}
}
break;
case INDIC_DOTS: {
const XYPOSITION widthDot = std::round(strokeWidth);
XYPOSITION x = std::floor(rc.left);
while (x < rc.right) {
const PRectangle rcDot = PRectangle(x, ymid,
x + widthDot, ymid + widthDot);
surface->FillRectangle(rcDot, sacDraw.fore);
x += widthDot * 2;
}
}
break;
case INDIC_COMPOSITIONTHICK: {
const PRectangle rcComposition(rc.left+1, rcLine.bottom-2, rc.right-1, rcLine.bottom);
surface->FillRectangle(rcComposition, sacDraw.fore);
}
break;
case INDIC_COMPOSITIONTHIN: {
const PRectangle rcComposition(rc.left+1, rcLine.bottom-2, rc.right-1, rcLine.bottom-1);
surface->FillRectangle(rcComposition, sacDraw.fore);
}
break;
case INDIC_POINT:
case INDIC_POINTCHARACTER:
if (rcCharacter.Width() >= 0.1) {
const XYPOSITION pixelHeight = std::floor(rc.Height() - 1.0f); // 1 pixel onto next line if multiphase
const XYPOSITION x = (sacDraw.style == INDIC_POINT) ? (rcCharacter.left) : ((rcCharacter.right + rcCharacter.left) / 2);
// 0.5f is to hit midpoint of pixels:
const XYPOSITION ix = std::round(x) + 0.5f;
const XYPOSITION iy = std::floor(rc.top + 1.0f) + 0.5f;
const Point pts[] = {
Point(ix - pixelHeight, iy + pixelHeight), // Left
Point(ix + pixelHeight, iy + pixelHeight), // Right
Point(ix, iy) // Top
};
surface->Polygon(pts, std::size(pts), FillStroke(sacDraw.fore));
}
break;
default:
// Either INDIC_PLAIN or unknown
surface->FillRectangle(PRectangle(rcAligned.left, ymid,
rcAligned.right, ymid + std::round(strokeWidth)), sacDraw.fore);
}
}
void Indicator::SetFlags(int attributes_) noexcept {
attributes = attributes_;
}
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