First Commit

libui-ng/old/_wip/attrstr_metrics/common_OLD_drawtext.c

@@ -0,0 +1,92 @@
+// 10 february 2017
+#include "../ui.h"
+#include "uipriv.h"
+
+// TODO this doesn't handle the case where nLines == 0
+// TODO this should never happen even if there are no characters??
+// TODO figure out how to make this work on GTK+
+void uiDrawCaret(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t pos, int *line)
+{
+	double xoff;
+	uiDrawTextLayoutLineMetrics m;
+	struct caretDrawParams cdp;
+	uiDrawPath *path;
+	uiDrawBrush brush;
+
+	if (*line < 0)
+		*line = 0;
+	if (*line > (uiDrawTextLayoutNumLines(layout) - 1))
+		*line = (uiDrawTextLayoutNumLines(layout) - 1);
+	// TODO cap pos
+	xoff = uiDrawTextLayoutByteLocationInLine(layout, pos, *line);
+	while (xoff < 0) {
+		size_t start, end;
+
+		uiDrawTextLayoutLineByteRange(layout, *line, &start, &end);
+		if (end < pos)		// too far up
+			(*line)++;
+		else
+			(*line)--;
+		xoff = uiDrawTextLayoutByteLocationInLine(layout, pos, *line);
+	}
+	uiDrawTextLayoutLineGetMetrics(layout, *line, &m);
+
+	caretDrawParams(c, m.Height, &cdp);
+
+	uiDrawSave(c);
+
+	path = uiDrawNewPath(uiDrawFillModeWinding);
+	uiDrawPathAddRectangle(path,
+		// TODO add m.X?
+		x + xoff - cdp.xoff, y + m.Y,
+		cdp.width, m.Height);
+	uiDrawPathEnd(path);
+	brush.Type = uiDrawBrushTypeSolid;
+	brush.R = cdp.r;
+	brush.G = cdp.g;
+	brush.B = cdp.b;
+	brush.A = cdp.a;
+	uiDrawFill(c, path, &brush);
+	uiDrawFreePath(path);
+
+	uiDrawRestore(c);
+}
+
+void drawTextBackground(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t start, size_t end, uiDrawBrush *brush, int isSelection)
+{
+	int line, nLines;
+	size_t lstart, lend;
+	double layoutwid, layoutht;
+
+	uiDrawTextLayoutExtents(layout, &layoutwid, &layoutht);
+	nLines = uiDrawTextLayoutNumLines(layout);
+	for (line = 0; line < nLines; line++) {
+		uiDrawTextLayoutLineByteRange(layout, line, &lstart, &lend);
+		if (start >= lstart && start < lend)
+			break;
+	}
+	while (end - start > 0) {
+		uiDrawTextLayoutLineMetrics m;
+		double startx, endx;
+		uiDrawPath *path;
+
+		uiDrawTextLayoutLineByteRange(layout, line, &lstart, &lend);
+		if (lend > end)		// don't cross lines
+			lend = end;
+		startx = uiDrawTextLayoutByteLocationInLine(layout, start, line);
+		// TODO explain this; note the use of start with lend
+		endx = layoutwid;
+		if (!isSelection || end <= lend)
+			endx = uiDrawTextLayoutByteLocationInLine(layout, lend, line);
+		uiDrawTextLayoutLineGetMetrics(layout, line, &m);
+		path = uiDrawNewPath(uiDrawFillModeWinding);
+		uiDrawPathAddRectangle(path,
+			x + startx, y + m.Y,
+			endx - startx, m.Height);
+		uiDrawPathEnd(path);
+		uiDrawFill(c, path, brush);
+		uiDrawFreePath(path);
+		line++;
+		start = lend;
+	}
+}